CN201508201U - Differential pressure detection type vortex street flowmeter for measuring differential pressure on one-sided pipe wall - Google Patents
Differential pressure detection type vortex street flowmeter for measuring differential pressure on one-sided pipe wall Download PDFInfo
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- CN201508201U CN201508201U CN2009202227211U CN200920222721U CN201508201U CN 201508201 U CN201508201 U CN 201508201U CN 2009202227211 U CN2009202227211 U CN 2009202227211U CN 200920222721 U CN200920222721 U CN 200920222721U CN 201508201 U CN201508201 U CN 201508201U
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- pressure sensing
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Abstract
The utility model discloses a differential pressure detection type vortex street flowmeter for measuring the differential pressure on a one-sided pipe wall. The differential pressure detection type vortex street flowmeter comprises a draft tube 1 through which fluid to be measured flows, a vortex generating body 6 arranged in the draft tube, and a pressure difference transducer 4 used for detecting the pressure variation of the fluid to be measured in the draft tube, wherein a first pressure sensing hole 2a and a second pressure sensing hole 2b are arranged sequentially along the flow direction on the pipe wall of the draft tube 1 on one side of the vortex generating body, positioned in the downstream of the opposite flow plane of the vortex generating body, and connected with the differential pressure sensor 4 via two pressure inducing pipes 3a and 3b. Through the two static pressure sensing holes on the pipe wall on either side of the vortex generating body and the two pressure inducing pipes connected therewith, an alternating differential pressure signal is guided to the differential pressure sensor for measuring the separating frequency of the tourbillion and the outflow. The utility model not only reduces the running noise signal for better frequency response characteristic of the system, but also facilitates the structural arrangement of accessories and the differential pressure sensor in the vortex street flowmeter.
Description
Technical field
The utility model relates to a kind of vortex shedding flow meter of measuring vortex shedding frequency, particularly a kind of on tube wall the differential pressure of pressure difference detect the formula vortex shedding flow meter.
Background technology
In the pipeline that fluid flows, the vortex that the body both sides can replace generation rule when fluid is walked around the generation body, is taking place to the vortex generation body that inserts definite shape in vertical current, and this vortex is known as Karman vortex street, and the vortex street frequency is proportional to the pipeline fluid velocity inside.Vortex shedding flow meter carries out work according to the principle of the mutual relationship of vortex street frequency and flow velocity.Therefore the detection of vortex shedding frequency just becomes the gordian technique of vortex flowmeter.At present, the detection method of vortex shedding frequency has multiple, and wherein, what relatively use always in the commercial production is that piezoelectric detection formula vortex shedding flow meter and differential pressure detect the formula vortex shedding flow meter.
Existing differential pressure detects formula vortex shedding flow meter (as Fig. 1) and adopts the both sides tube wall to get the method for differential pressure, promptly on the two effluent tube walls tracting pressuring hole is being set respectively behind the vortex generation body, measure this differential pressure of 2 with differential pressure pick-up, differential pressure signal by differential pressure pick-up output obtains vortex shedding frequency, and then obtains the volume flow value.Because the pressure point of this two side ways of measure pressure all is in the vortex wake part at the rear portion of vortex generation body, it is the strongest zone of hydrodynamic noise herein, therefore, must be superimposed with stronger in the final differential pressure signal of being gathered, complicated mobile bath acoustical signal, this will increase the weight of the burden of signal processing circuit.In addition, this ways of measure pressure also can increase the length of impulse pipeline, is unfavorable for the structural arrangement of annex in the vortex shedding flow meter and differential pressure pick-up, can make also that simultaneously the frequency characteristic of pressure system is affected.
Summary of the invention
The purpose of this utility model provides a kind of differential pressure of getting differential pressure on one-sided tube wall and detects the formula vortex shedding flow meter, and this turbulent throttle amount meter can reduce flowing noise signal, obtains better system frequency individual features.
Be the purpose of this utility model, following technical scheme is provided: a kind of differential pressure of getting differential pressure on one-sided tube wall detects the formula vortex shedding flow meter, comprising: draft tube, flow through in it and treat fluid measured; Vortex generation body is placed in the draft tube; Pressure/differential pressure sensor, detecting the pressure for the treatment of fluid measured in the draft tube changes, wherein, longshore current is set to first and second pressure sensing holes of arranging successively on the draft tube tube wall of vortex generation body one side, first and second pressure sensing holes link to each other with differential pressure pick-up with second pressure guiding pipe by first pressure guiding pipe respectively.
Wherein first and second pressure sensing holes (2a, 2b) are positioned at the downstream of the fluoran stream surface of described vortex generation body (6), and be in longshore current to same plane in, described plane is perpendicular to the longitudinal axis of vortex generation body.
Particularly, first pressure sensing hole apart from the fluoran stream surface of vortex generation body apart from the scope of F at 0.2d-0.7d, wherein d is the fluoran stream surface width of described vortex generation body.
Particularly, the spacing H between second pressure sensing hole and first pressure sensing hole is limited by following formula: H=0.5d (1-1.25d/D)/St
Wherein: D is the internal diameter of draft tube, and St is the average Sr in flow measurement range.
Particularly, the internal diameter value of pressure sensing hole is not less than 3mm, preferably at 3-10mm.The internal diameter of pressure sensing hole and pressure guiding pipe is identical.
Advantage applies of the present utility model is in the following areas:
The utility model by two static pressure sensing holes on the tube wall of vortex generation body either side with its two pressure guiding pipes that are connected respectively, the alternation differential pressure signal is directed to differential pressure pick-up, detect vortex shedding frequency, thereby detect flow, therefore the strongest zone of hydrodynamic noise has been avoided in the position of pressure sensing hole, can reduce flowing noise signal.
In addition, the utility model since pressure sensing hole in the same side of draft tube, so the length of pressure guiding pipeline will be shorter, can obtain better system frequency response characteristic.And homonymy arranges that two connecting pipes have also made things convenient for the structural arrangement of annex in the vortex shedding flow meter and differential pressure pick-up, make to be fit to the utility model vortex shedding flow meter compact overall structure produce in batches.
Below in conjunction with accompanying drawing the utility model is elaborated.
Description of drawings
Fig. 1 is a composition synoptic diagram of getting the differential pressure type vortex shedding flow meter of differential pressure in the prior art on the tube wall of both sides;
Fig. 2 is the composition synoptic diagram of the utility model vortex shedding flow meter;
Fig. 3 is the structure zoomed-in view of draft tube of the present utility model shown in Fig. 2 and vortex generation body;
Fig. 4 is the signal waveform under the utility model vortex shedding flow meter different flow.
Description of reference numerals: 1, draft tube; 2a, first pressure sensing hole; 2b, second pressure sensing hole; 3a, first pressure guiding pipe; 3b, second pressure guiding pipe; 4, differential pressure pick-up; 5, vortex frequency testing circuit; 6, vortex generation body; 6a, fluoran stream surface;
D, fluoran stream surface width; The spacing of F, first pressure sensing hole and fluoran stream surface; Spacing between H, first and second pressure sensing holes.
Embodiment
According to the Karman vortex street theory, because vortex separates when forming stable vortex street, the vertical and horizontal spacing of stagger arrangement vortex street vortex array will keep constant, not change with change in flow in process fluid flow.Therefore, be in vortex generation body homonymy and, will have synchronous pressure history apart from being 2 points of vortex street vortex longitudinal pitch; And distance is 2 points partly of vortex street vortex longitudinal pitch, will have the pressure history of 180 ° of phase phasic differences, and these 2 pressure reduction ripple amplitudes will be 2 times of single-point pressure fluctuation amplitude.The utility model is exactly according to this principle, takes out the alternation differential pressure signal identical with vortex shedding frequency on lateral flow tubes.
As shown in Figure 2, Fig. 2 is the composition synoptic diagram of the utility model vortex shedding flow meter.This vortex shedding flow meter comprises: draft tube 1, the differential pressure pick-up 4 that is placed in vortex generation body 6 in the draft tube 1, links to each other with draft tube by the first pressure guiding pipe 3a and the second pressure guiding pipe 3b, differential pressure pickup 4 also is connected with vortex frequency testing circuit 5, draft tube 1 is provided with the first pressure sensing hole 2a and the second pressure sensing hole 2b, communicates with the first pressure guiding pipe 3a and the second pressure guiding pipe 3b respectively.
As we can see from the figure, the first pressure sensing hole 2a and the second pressure sensing hole 2b by with its two pressure guiding pipe 3a and 3b that are connected respectively, the alternation differential pressure signal is directed to differential pressure pick-up 4, differential pressure pick-up passes to the signal that receives coupled vortex frequency testing circuit 5 further, vortex frequency testing circuit 5 detects vortex shedding frequency, thereby detects flow.
Fig. 3 is the structure zoomed-in view of draft tube of the present utility model shown in Fig. 2 and vortex generation body.As shown in the figure, the first pressure sensing hole 2a and the second pressure sensing hole 2b are positioned on homonymy draft tube 1 tube wall of vortex generation body 6, be in the downstream of vortex generation body 6 fluoran stream surface 6a, longshore current is to arranging successively, make its be in longshore current to same plane in, this plane is perpendicular to the plane of the longitudinal axis of vortex generation body 6.
The actual inner diameter D of draft tube 1 is 40mm, and vortex generation body 6 is the cylindricality generation body of isosceles triangle for the cross section.
The first pressure sensing hole 2a gets 7.84mm apart from the fluoran stream surface 6a's of vortex generation body 6 apart from F; Spacing H between the second pressure sensing hole 2b and the first pressure sensing hole 2a is taken as 43.2mm.
Pressure sensing hole and connecting pipe diameter of phi are 4mm, and the length of the first pressure guiding pipe 3a and the second pressure guiding pipe 3b is 100mm.Differential pressure pick-up 4 adopts the both-end isolated form differential pressure pick-up of full scale 25KPa output 60mV.
It is 10m that Fig. 4 has provided pipeline inner fluid flow range
3/ h-150m
3/ h output signal frequency scope is the differential pressure signal oscillogram under the 30Hz-400Hz.Go up the waveform voltage signal that waveform is represented non-filtered among the figure, following waveform is represented through filtered waveform voltage signal.
When record different wave figure, time shaft (X-axis) adopts different gears with voltage axis (Y-axis).
As can be known from Fig. 4, there is good secondary relation between voltage signal amplitude and the flow.Because the voltage signal amplitude of differential pressure pick-up output has strict linear relationship with the differential pressure amplitude that acts on the differential pressure pick-up, so be linear relationship between the quadratic power of differential pressure signal amplitude and flow herein.Therefore, can well reach the purpose that fluid flow detects with vortex shedding flow meter described in the utility model.
Although above the utility model is had been described in detail, the utility model is not limited thereto, and those skilled in the art of the present technique can carry out various modifications according to principle of the present utility model.Therefore, all modifications of being done according to the utility model principle all should be understood to fall into protection domain of the present utility model.
Claims (7)
1. vortex shedding flow meter comprises:
Draft tube (1) flows through in it and treats fluid measured;
Vortex generation body (6) is placed in the draft tube (1);
Detect the differential pressure pickup (4) of the pressure variation for the treatment of fluid measured in the draft tube; It is characterized in that:
On draft tube (1) tube wall of vortex generation body (6) one sides, longshore current is set to first and second pressure sensing holes of arranging successively (2a and 2b), first and second pressure sensing holes link to each other with differential pressure pick-up (4) by two pressure guiding pipes (3a, 3b) respectively.
2. vortex shedding flow meter as claimed in claim 1 is characterized in that:
Described first and second pressure sensing holes (2a, 2b) are positioned at the downstream of the fluoran stream surface of described vortex generation body (6), and be in longshore current to same plane in, described plane is perpendicular to the longitudinal axis of vortex generation body (6).
3. vortex shedding flow meter as claimed in claim 1 or 2, it is characterized in that: at 0.2d-0.7d, wherein d is the fluoran stream surface width of described vortex generation body (6) to described first pressure sensing hole (2a) apart from the scope of the distance (F) of the fluoran stream surface (6a) of vortex generation body (6).
4. vortex shedding flow meter as claimed in claim 3 is characterized in that: the spacing H between described second pressure sensing hole (2b) and described first pressure sensing hole is limited by following formula:
H＝0.5d(1-1.25d/D)/St
Wherein: D is the internal diameter of draft tube (1), and St is the average Sr in flow measurement range.
5. vortex shedding flow meter as claimed in claim 1 or 2 is characterized in that: the internal diameter value of described pressure sensing hole is not less than 3mm.
6. vortex shedding flow meter as claimed in claim 5 is characterized in that: the internal diameter value of described pressure sensing hole is in the scope of 3-10mm.
7. vortex shedding flow meter as claimed in claim 1 or 2 is characterized in that: the internal diameter of described pressure sensing hole and pressure guiding pipe is identical.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202227211U CN201508201U (en) | 2009-09-21 | 2009-09-21 | Differential pressure detection type vortex street flowmeter for measuring differential pressure on one-sided pipe wall |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202227211U CN201508201U (en) | 2009-09-21 | 2009-09-21 | Differential pressure detection type vortex street flowmeter for measuring differential pressure on one-sided pipe wall |
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| Publication Number | Publication Date |
|---|---|
| CN201508201U true CN201508201U (en) | 2010-06-16 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2009202227211U Expired - Lifetime CN201508201U (en) | 2009-09-21 | 2009-09-21 | Differential pressure detection type vortex street flowmeter for measuring differential pressure on one-sided pipe wall |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105181031A (en) * | 2015-05-20 | 2015-12-23 | 杭州子午仪器有限公司 | Vortex flowmeter based on multi-sensor information fusion |
| CN107764344A (en) * | 2016-08-16 | 2018-03-06 | 王子平 | For measuring the rectangle flowmeter of gas flow |
| CN108896120A (en) * | 2018-08-23 | 2018-11-27 | 中国石油天然气股份有限公司 | Vortex street throttling integral type gas-liquid biphase flowmeter and its application method |
| CN110132364A (en) * | 2019-04-29 | 2019-08-16 | 天津大学 | Vortex street cross correlation flowmeter based on Miniature Transient pressure sensor |
| CN110596417A (en) * | 2019-08-20 | 2019-12-20 | 光力科技股份有限公司 | Wind speed on-line monitoring method |
| CN113375901A (en) * | 2021-05-14 | 2021-09-10 | 东方电气集团科学技术研究院有限公司 | Method for testing vortex street frequency and flow velocity between tubes of flow-induced vibration of tube bundle structure |
-
2009
- 2009-09-21 CN CN2009202227211U patent/CN201508201U/en not_active Expired - Lifetime
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105181031A (en) * | 2015-05-20 | 2015-12-23 | 杭州子午仪器有限公司 | Vortex flowmeter based on multi-sensor information fusion |
| CN105181031B (en) * | 2015-05-20 | 2018-04-27 | 杭州子午仪器有限公司 | A kind of vortex-shedding meter based on multi-sensor information fusion |
| CN107764344A (en) * | 2016-08-16 | 2018-03-06 | 王子平 | For measuring the rectangle flowmeter of gas flow |
| CN108896120A (en) * | 2018-08-23 | 2018-11-27 | 中国石油天然气股份有限公司 | Vortex street throttling integral type gas-liquid biphase flowmeter and its application method |
| CN110132364A (en) * | 2019-04-29 | 2019-08-16 | 天津大学 | Vortex street cross correlation flowmeter based on Miniature Transient pressure sensor |
| CN110132364B (en) * | 2019-04-29 | 2021-01-05 | 天津大学 | Vortex street cross-correlation flowmeter based on miniature transient pressure sensor |
| CN110596417A (en) * | 2019-08-20 | 2019-12-20 | 光力科技股份有限公司 | Wind speed on-line monitoring method |
| CN113375901A (en) * | 2021-05-14 | 2021-09-10 | 东方电气集团科学技术研究院有限公司 | Method for testing vortex street frequency and flow velocity between tubes of flow-induced vibration of tube bundle structure |
| CN113375901B (en) * | 2021-05-14 | 2023-05-16 | 东方电气集团科学技术研究院有限公司 | Vortex street frequency and inter-tube flow velocity testing method for tube bundle structure flow induced vibration |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20100616 |
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| CX01 | Expiry of patent term |