CN201081746Y

CN201081746Y - Magnetoelectric vortex shedding flow meter

Info

Publication number: CN201081746Y
Application number: CNU200720071959XU
Authority: CN
Inventors: 鲁金祥
Original assignee: Shanghai Xingkong Automation Instrumentation Co Ltd
Current assignee: Shanghai Xingkong Automation Instrumentation Co Ltd
Priority date: 2007-06-29
Filing date: 2007-06-29
Publication date: 2008-07-02
Anticipated expiration: 2017-06-29

Abstract

The utility model provides a magnetoelectric 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 magnetoelectric vortex shedding flowmeter, under the condition of the same caliber and flow speed, the flowmeter of the utility model can release higher frequency and stronger signal, that is, 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; 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

Electromagnetic vortex sjeddomg flowmeter

Technical field

The utility model relates to a kind of vortex shedding flow meter, and particularly a kind of utilization " toll bar " vortex street principle and Faradic electricity magnetic induction principle design, and is used for measuring the electromagnetic vortex sjeddomg flowmeter of conductive fluid medium.Can be widely used in the metering of field conducting liquid flows such as industries such as oil, chemical industry, metallurgy, weaving, food, pharmacy, papermaking and environmental protection, municipal plumbing, water conservancy construction, river dredging.

Background technology

Electromagnetic vortex sjeddomg flowmeter is the same with other vortex shedding flow meter, is to utilize " toll bar " vortex street principle, is different from the piezoelectric type detection mode of most of vortex shedding flow meters now, the vortex shedding flow meter that adopts induction novel detection mode to form.When conducting medium flows through triangulo column 10 with certain speed, produce a vortex band of alternately arranging in back, triangulo column 10 both sides, be referred to as " toll bar vortex ", upper and

lower magnet

11,12 in the encapsulating housing produces magnetic field because of the alternately effect of vortex, produce the charge signal of the frequency identical with vortex at electrode 9 ends, after delivering to that converter is intelligent and handle by cable, realize demonstration and the communication between data on flows and the microsystem and the control (schematic diagram is seen Fig. 1) of transient liquid flow, integrated flux.

Because this product has been taken into account every advantage of traditional vortex shedding flow meter, overcome the shortcoming of original product resistance to shock difference simultaneously, particularly all be greatly improved aspect the critical natures such as its flow detection scope, measuring accuracy, measurement lower limit, the now existing development trend that replaces the water meter of traditional sense, market outlook are boundless.But electromagnetic vortex sjeddomg flowmeter, 10 width d are big because of triangulo column, magnet distance between the upper and

lower magnet

11,12 is far away, little with respect to small-bore frequency under same flow condition, it is big especially promptly to discharge each frequency representative flow, shortcomings such as so electromagnetic vortex sjeddomg flowmeter must have signal difference, and accuracy of detection is low.

The utility model content

Technical problem to be solved in the utility model is to provide a kind of electromagnetic vortex sjeddomg flowmeter, and is low to solve existing electromagnetic vortex sjeddomg 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:

Electromagnetic vortex sjeddomg flowmeter comprises footpath at a gulp measuring tube and small-bore electromagnetic vortex sjeddomg flowmeter, it is characterized in that, small-bore electromagnetic vortex sjeddomg flowmeter is inserted in the heavy caliber measuring tube.

In order to make the liquid 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 electromagnetic vortex sjeddomg flowmeter.

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 electromagnetic vortex sjeddomg flowmeter is provided with a last arm that is connected as a single entity with it and a lower magnet mounting pipe, on described, be equipped with in the arm small-bore electromagnetic vortex sjeddomg flowmeter on magnet, electrode, the described arm of going up is connected with the joint flange of heavy caliber measuring tube by small-bore electromagnetic vortex sjeddomg flowmeter; 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 magnet mounting pipe by a direction fixed pin, in described lower magnet mounting pipe lower magnet is installed.

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:

f＝Sr·V/d

V＝f·d/Sr

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 magnet that furthered simultaneously reaches the distance between magnet and the electrode tip each other, and 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 electromagnetic vortex sjeddomg flowmeter of bore DN200 is very little, it is also few to produce bore DN300 producer, adopt the electromagnetic vortex sjeddomg flowmeter 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 electromagnetic vortex sjeddomg flowmeter, 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 electromagnetic vortex sjeddomg flowmeter 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 electromagnetic vortex sjeddomg flowmeter schematic diagram.

Fig. 2 is the general structural representation of existing electromagnetic vortex sjeddomg flowmeter.

Fig. 3-1 is the structural representation of the utility model electromagnetic vortex sjeddomg flowmeter.

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 nut, 4 is last arm pressing plate, 5 is insulation sleeve, and 6 is set nut, and 7,8 is insulating mat, 9 is electrode, 10 is triangulo column, and 11 is last magnet, and 12 is lower magnet, 13 is little measuring tube, 14 is big measuring tube, and 15 is mozzle, and 16 is lower branch line, 17 is last arm, 18 is the direction fixed pin, and 19 is set nut, and 20 is the lower magnet mounting pipe, 21 is the joint flange of small-bore electromagnetic vortex sjeddomg flowmeter, and 22 is the joint flange of heavy caliber measuring tube.

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 electromagnetic vortex sjeddomg flowmeter, mainly contains the compositions such as signal wire 2 of little measuring tube 13, triangulo column 11, last magnet 10, lower magnet 12, electrode 9, insulating

mat

7 and 8, the set nut 6 that compresses electrode 9 usefulness, insulation sleeve 5, nut 3, signal processing converter 1, access signal processing converter 1.

Referring to the electromagnetic vortex sjeddomg flowmeter of Fig. 3-1 and Fig. 3-2, comprise footpath at a gulp measuring tube 14 and small-bore electromagnetic vortex sjeddomg flowmeter, small-bore electromagnetic vortex sjeddomg flowmeter is inserted in the heavy caliber measuring tube 14.Concrete mounting means is that the joint flange 22 with the joint flange 21 of small-bore electromagnetic vortex sjeddomg flowmeter and heavy caliber measuring tube is connected by screw bolt and nut and gets final product.

In order to make the liquid in the small flowmeter of flowing through not produce fluctuation, install a mozzle 15 additional at the front end of the little measuring tube 13 of small-bore electromagnetic vortex sjeddomg flowmeter.Mozzle 15 is straight pipe or is reducer pipe.The mozzle 15 of present embodiment adopts reducer pipe, can reduce flux lower limit when detecting, and improves the measuring accuracy of flowmeter.

In little measuring tube 13, triangulo column 10 is installed, and this little measuring tube 13 be provided with one be connected as a single entity with it on arm 17 and lower magnet mounting pipe 20, the top of last arm 17 is installed on the joint flange 21 of small-bore electromagnetic vortex sjeddomg flowmeter by last arm pressing plate 4 and securing member.By nut 3, set nut 6, insulation sleeve 5, insulating

mat

7,8 magnet 11 and electrode 9 are installed in last arm 17, the measuring head of electrode 9 is inserted in the little measuring tube 13.

Lower magnet 12 is installed in lower magnet mounting pipe 20.Lower branch line 16 is connected as a single entity with big measuring tube 14, and its top has external thread, is rotary with set nut 19 on this external thread, and the upper end direction of passage fixed pin 18 of lower branch line 16 is connected with lower magnet mounting pipe 20.After set nut 19 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 electromagnetic vortex sjeddomg flowmeter 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 14 of user and the consistent basis of detection with big measuring tube 14, 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 electromagnetic vortex sjeddomg flowmeter, 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 electromagnetic vortex sjeddomg flowmeter.

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

1. electromagnetic vortex sjeddomg flowmeter comprises footpath at a gulp measuring tube and small-bore electromagnetic vortex sjeddomg flowmeter, it is characterized in that, small-bore electromagnetic vortex sjeddomg flowmeter is inserted in the heavy caliber measuring tube.

2. electromagnetic vortex sjeddomg flowmeter 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 electromagnetic vortex sjeddomg flowmeter.

3. electromagnetic vortex sjeddomg flowmeter according to claim 2 is characterized in that, described mozzle is a straight pipe.

4. electromagnetic vortex sjeddomg flowmeter according to claim 2 is characterized in that, described mozzle is a reducer pipe.