CN201081738Y - Vortex shedding flow meter - Google Patents
Vortex shedding flow meter Download PDFInfo
- Publication number
- CN201081738Y CN201081738Y CNU200720072624XU CN200720072624U CN201081738Y CN 201081738 Y CN201081738 Y CN 201081738Y CN U200720072624X U CNU200720072624X U CN U200720072624XU CN 200720072624 U CN200720072624 U CN 200720072624U CN 201081738 Y CN201081738 Y CN 201081738Y
- Authority
- CN
- China
- Prior art keywords
- vortex shedding
- bore
- flow meter
- small
- flowmeter
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 239000003638 reducing agent Substances 0.000 claims description 5
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- 239000000523 sample Substances 0.000 description 9
- 210000004907 Glands Anatomy 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000004907 flux Effects 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 239000012530 fluid Substances 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
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Abstract
The utility model provides a vortex shedding flowmeter which comprises a big-bore measuring tube and a small-bore magnetoelectric vortex shedding flowmeter. The utility model is characterized in that the small-bore magnetoelectric vortex shedding flowmeter is inserted into the big-bore measuring tube. The caliber of the vortex shedding flowmeter of the utility model can be up to DN600, or even larger; compared with the prior vortex shedding flowmeter, under the conditions of the same caliber and flow speed, the flowmeter of the utility model can release higher frequency and stronger signals. The flowmeter of the utility model has the advantages of high measuring accuracy, low measuring lower limit, short lengths of front and back arranged straight pipelines, etc,; on the premise of guaranteeing that the measuring tubes with the same specification can be changed with each other (guaranteeing that the measuring tube for detecting corresponds to a user measuring pipeline), and under the condition of maintaining the correspondence of the direction for arranging a small-bore sensor, the hardcore of the small-bore sensor can be returned to the original manufacturer or a monitoring management department, thereby solving the problem that the magnetoelectric vortex shedding flowmeter is difficult to submit for inspection, and greatly reducing the cost of mounting and detaching for inspection.
Description
Technical field
The utility model relates to a kind of vortex shedding flow meter, and particularly a kind of utilization " toll bar " vortex principle design is used for measuring the heavy caliber novel vortex street flowmeter of the mass rate and the volumetric flow rate of closed conduct steam, gas and liquid medium.
Background technology
The vortex shedding flow meter principle of work is when medium in closed conduct flows through triangulo column 5 with certain speed, produce a vortex band of alternately arranging in back, triangulo column 5 both sides, be referred to as " toll bar vortex ", because of the alternately effect of vortex, thereby make detection probe 4 produce alterante stress, be encapsulated in the detection probe 4 piezoelectric element alterante stress effect under, produce alternation charge signal with the vortex same frequency, after delivering to that converter 1 is intelligent and handle by cable 2, realize steam, gas and liquid medium instantaneous delivery, communication between the demonstration of integrated flux and data on flows and the microsystem and control (schematic diagram is seen Fig. 1).
Large caliber vortex shedding flowmeter is big because of triangular prism width d at present, the position is relative nearer between detection probe and the triangulo column, release frequency with respect to small-bore flowmeter under same flow condition is less, the flow that discharges each frequency representative when promptly detecting is big, so exist signal difference, shortcoming such as accuracy of detection is low.Existing in addition large caliber vortex shedding flowmeter is all existing many weak points aspect the critical natures such as its flow detection scope, measuring accuracy, measurement lower limit.
The utility model content
Technical problem to be solved in the utility model is to provide a kind of vortex shedding flow meter, and is low to solve existing large caliber vortex shedding flowmeter accuracy of detection, shortcomings such as signal difference.
Technical problem to be solved in the utility model can be achieved through the following technical solutions:
A kind of vortex shedding flow meter comprises footpath at a gulp measuring tube and small-bore vortex shedding flow meter, it is characterized in that, small-bore vortex shedding flow meter is inserted in the heavy caliber measuring tube.
In order to make the medium in the small flowmeter of flowing through not produce fluctuation, in the utility model, install a mozzle additional at the front end of the little measuring tube of described small-bore vortex shedding flow meter.
Described mozzle is straight pipe or is reducer pipe.When mozzle adopts reducer pipe, when detecting, can reduce flux lower limit, improve the measuring accuracy of flowmeter.
The little measuring tube of described small-bore vortex shedding flow meter is provided with a last arm that is connected as a single entity with it and a lower branch line mounting pipe, by gland nut detection probe is installed in the arm on described, the described arm of going up is connected with the joint flange of heavy caliber measuring tube by small-bore vortex shedding flow meter; Be provided with the lower branch line that is connected as a single entity with it in described heavy caliber measuring tube, be rotary with a set nut on the described lower branch line, this lower branch line is connected with the lower branch line mounting pipe by a direction fixed pin.
Because of necessarily needing promise to count the release frequency f of vortex in the scope and head-on concerning between the width d of flow rate of fluid V and vortex generation body, available following formula is expressed:
Q＝3600×f/K
The release frequency V-flow velocity of f-toll bar vortex
D-triangulo column width S r-coefficient (being called Strouhal number)
Q-measuring tube inner fluid flow K-instrument coefficient
So, from above-mentioned expression formula, can know, in same pipeline during identical flow velocity (flow), as triangular prism fluoran stream surface width d value is diminished, the f value is corresponding can to become big, the distance between the detection probe that furthered simultaneously and the triangulo column, the signal amplitude value of the frequency f that is produced is big, and promptly signal is strengthened.
From the utility model structure, can know, the manufacturer that originally can produce the above vortex shedding flow meter of bore DN200 is considerably less, it is also few to produce bore DN300 producer, adopts the vortex shedding flow meter bore of the utility model structure to reach as high as DN600 now, even can do more; Because the utility model flowmeter is under the same flow rate conditions of same bore, compare with original vortex shedding flow meter, releasable frequency height, signal are strong, and promptly this new flowmeter has that measuring accuracy height, measurement lower limit are low, front and back install advantages such as flow development length is short; Guaranteeing (guaranteeing to detect gets consistent with measuring tube with user's measuring channel) under the interchangeable prerequisite of same specification measuring tube, and keep installing under the situation of its small-bore sensor position direction unanimity, its small-bore Sensor core partly can be returned former factory or monitoring management department, can solve vortex shedding flow meter and inspect difficult problem by ready samples, and greatly reduce in the censorship and must mount and dismount expense.
Description of drawings
Fig. 1 is the vortex shedding flow meter schematic diagram.
Fig. 2 is the general structural representation of existing vortex shedding flow meter.
Fig. 3-1 is the structural representation of the utility model vortex shedding flow meter.
Fig. 3-2 is the A place enlarged diagram of Fig. 3-1.
Be labeled as among the figure: 1 is signal processing converter, and 2 is signal wire, and 3 is little measuring tube, 4 is detection probe, and 5 is triangulo column, and 6 is gland nut, 7 is last arm, and 8 is the direction fixed pin, and 9 is set nut, 10 is lower branch line, and 11 is mozzle, and 12 is the joint flange of small-bore vortex shedding flow meter, 13 is last arm pressing plate, 14 is the joint flange of heavy caliber measuring tube, and 15 is the heavy caliber measuring tube, and 16 is the lower branch line mounting pipe.
Embodiment
For technological means, creation characteristic that the utility model is realized, reach purpose and effect is easy to understand, below in conjunction with embodiment, further set forth the utility model.
Fig. 2 is the general structural representation of existing vortex shedding flow meter, mainly contains the compositions such as signal wire 2 of little measuring tube 3, triangulo column 5, detection probe 4, signal processing converter 1, access signal processing converter 1.
Referring to the vortex shedding flow meter of Fig. 3-1 and Fig. 3-2, comprise footpath at a gulp measuring tube 15 and small-bore vortex shedding flow meter, small-bore vortex shedding flow meter is inserted in the heavy caliber measuring tube 15.Concrete mounting means is that the joint flange 14 with the joint flange 12 of small-bore vortex shedding flow meter and heavy caliber measuring tube is connected by screw bolt and nut and gets final product.
In order to make the medium in the small-bore vortex shedding flow meter of flowing through not produce fluctuation, install a mozzle 11 additional at the front end of the little measuring tube 3 of small-bore vortex shedding flow meter.Mozzle 11 is straight pipe or is reducer pipe.The mozzle 11 of present embodiment adopts reducer pipe, can reduce flux lower limit when detecting, and improves the measuring accuracy of flowmeter.
In little measuring tube 3, triangulo column 5 is installed, and this little measuring tube 3 be provided with one be connected as a single entity with it on arm 7, the top of last arm 7 is installed on the joint flange 12 of small-bore vortex shedding flow meter by last arm pressing plate 13 and securing member.Compress detection probe 4 by gland nut 6 in last arm 7, the measuring head of detection probe 4 is inserted in the little measuring tube 3.
Lower branch line mounting pipe 16 is connected as a single entity with little measuring tube 3, and lower branch line 10 is connected as a single entity with big measuring tube 15, and its top has external thread, is rotary with set nut 9 on this external thread, and the upper end direction of passage fixed pin 8 of lower branch line 10 is connected with lower branch line mounting pipe 16.After set nut 9 is upwards locked and adjusted, can keep the pipeline center of small flowmeter consistent, can prevent the small flowmeter shake simultaneously with pipeline center's direction of big measuring tube 14.
Adopt the vortex shedding flow meter of Fig. 3-1, the core component of its detection (sensor) is smaller, can easily its extraction be returned the censorship of former factory or detection department, the utility model is guaranteeing on big measuring tube 15 of user and the consistent basis of detection with little measuring tube 3, made a large amount of commutativitys, comparative tests, its accuracy of detection unitarity reaches more than 98%, realize a heavy caliber censorship difficult problem very easily, this utility model is compared with former vortex shedding flow meter, has the frequency of detection height, characteristics such as signal is strong, promptly has the measuring accuracy height simultaneously, measurement lower limit is low, characteristics such as flow development length weak point are installed in front and back, be particularly suitable for the metering of large diameter pipeline flow, can realize expanding to more bigbore vortex shedding flow meter.
More than show and described ultimate principle of the present utility model, principal character and advantage of the present utility model.The technician of the industry should understand; the utility model is not restricted to the described embodiments; that describes in the foregoing description and the instructions just illustrates principle of the present utility model; the utility model also has various changes and modifications under the prerequisite that does not break away from the utility model spirit and scope, and these changes and improvements all fall in claimed the utility model scope.The claimed scope of the utility model is defined by appending claims and equivalent thereof.
Claims (4)
1. a vortex shedding flow meter comprises footpath at a gulp measuring tube and small-bore electromagnetic vortex sjeddomg flowmeter, it is characterized in that, small-bore vortex shedding flow meter is inserted in the heavy caliber measuring tube.
2. a kind of vortex shedding flow meter according to claim 1 is characterized in that, installs a mozzle additional at the front end of the little measuring tube of described small-bore vortex shedding flow meter.
3. a kind of vortex shedding flow meter according to claim 2 is characterized in that, described mozzle is a straight pipe.
4. a kind of vortex shedding flow meter according to claim 2 is characterized in that, described mozzle is a reducer pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU200720072624XU CN201081738Y (en) | 2007-07-19 | 2007-07-19 | Vortex shedding flow meter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU200720072624XU CN201081738Y (en) | 2007-07-19 | 2007-07-19 | Vortex shedding flow meter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201081738Y true CN201081738Y (en) | 2008-07-02 |
Family
ID=39615407
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU200720072624XU Expired - Lifetime CN201081738Y (en) | 2007-07-19 | 2007-07-19 | Vortex shedding flow meter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201081738Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102721448A (en) * | 2012-05-31 | 2012-10-10 | 郑州光力科技股份有限公司 | Anti-smudginess inserted vortex shedding flowmeter |
| CN105021234A (en) * | 2015-08-11 | 2015-11-04 | 哈尔滨工程大学 | Bionic type electromagnetic vortex street flow meter with vortex street enhancing capacity |
-
2007
- 2007-07-19 CN CNU200720072624XU patent/CN201081738Y/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102721448A (en) * | 2012-05-31 | 2012-10-10 | 郑州光力科技股份有限公司 | Anti-smudginess inserted vortex shedding flowmeter |
| CN105021234A (en) * | 2015-08-11 | 2015-11-04 | 哈尔滨工程大学 | Bionic type electromagnetic vortex street flow meter with vortex street enhancing capacity |
| CN105021234B (en) * | 2015-08-11 | 2018-12-07 | 哈尔滨工程大学 | A kind of biomimetic type magnetic vortex street flowmeter for reinforcing ability with vortex street |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20080702 |