CN2890849Y

CN2890849Y - Electromagnetic vortex shedding flowmeter

Info

Publication number: CN2890849Y
Application number: CN 200620072302
Authority: CN
Inventors: 杨长春
Original assignee: XUZHOU JINKE INSTRUMENT AND METER CO Ltd
Current assignee: XUZHOU JINKE INSTRUMENT AND METER CO Ltd
Priority date: 2006-04-06
Filing date: 2006-04-06
Publication date: 2007-04-18
Anticipated expiration: 2016-04-06

Abstract

The utility model relates to an electromagnetic vortex flowmeter, which is characterized in that a flow tube is inwardly equipped with a triangular prism whose back is equipped with a probe, and a permanent magnet is equipped on the exterior of the flow tube on the positions corresponding to the probe which forms a signal sensor with the permanent magnet. The probe is a needle-shaped conductor which is hanged perpendicularly in the center of the flow tube, and the tail of the probe is equipped on the exterior of the flow tube and is connected with a binding post which conducts the inspection signals. The utility model has low cost without axial bounce effects, thereby can directly replace the vortex flowmeter.

Description

Magnetic vortex street flowmeter

Technical field:

The utility model relates to measuring instrument, a kind of flowmeter of more specifically saying so.

Background technology:

Vortex shedding flow meter is applied to the detection of fluid flow, is used in industries such as oil, chemical industry, food, medicine, smelting both at home and abroad in a large number.Traditional vortex shedding flow meter is made up of flowtube 1, triangular prism 2, sensor 8, signal processing system 5 and display 6 etc., its structural principle as shown in Figure 1, according to the Karman vortex street principle, when 1 li of flowtube has fluid to flow through, because the existence of triangular prism 2, can produce resistance, make the fluid shunting, can produce eddy current in the place ahead of sensor 8 like this, sensor 8 just produces induced signal because of eddy current, and send their quantity to signal processing system 5, by analysis and calculate, the form with numeral in display 6 shows in coming out; The problem that the flowmeter of this version mainly exists is:

1, jumping effect is axially arranged: because many flowmeters in use, the most and pump housing links, because the vibration of pump is very big, can produce vibration up and down, cause the and then vibration of flowtube 1 of flowmeter, thus also just influenced eddy current normal generation, influenced the metering result;

2, low discharge is not very accurate: the eddy current that produces during owing to low discharge is very little, and the induced signal numerical value that sensor produces is inconsistent, and it is not very accurate causing the low discharge metering;

3, its signal acquiring system is made up of triangular prism and sensor, the production cost height.

Summary of the invention:

The utility model is for avoiding above-mentioned existing in prior technology weak point, a kind of low cost, high-precision magnetic vortex street flowmeter being provided.

The technical scheme that the utility model technical solution problem is adopted is:

Design feature of the present utility model is that triangular prism is set in flowtube, at described trequetrous back probe is set, with the outer setting permanent magnet of the flowtube of probe corresponding position, constitute signal transducer with described probe and permanent magnet; Described probe is the needle-like conductive body, vertically is suspended in the central authorities of flowtube, and the afterbody of probe places the outside of flowtube, and is connected with binding post, and detectable signal is drawn on binding post.

When having fluid to flow through in the flowtube, because trequetrous existence produces resistance, make the fluid shunting, thereby before probe, can produce eddy current; Simultaneously on this position because the existence of permanent magnet, can produce a high-intensity magnetic field, the athletic meeting of eddy current produces induced electromotive force, therefore probe will produce induced electromotive force and export as detection signal, by follow-up signal processing system analytical calculation, the form with numeral in display shows in coming out again.

Compared with the prior art, the beneficial effects of the utility model are embodied in:

1, the utility model probe and a permanent magnet have substituted employed sensor in traditional vortex shedding flow meter, the version of electromagnetic flowmeter and vortex shedding flow meter has been carried out combination cleverly, can accurately measure fluid flow need not to use under the situation of solenoid and vortex street sensor, and precision reaches 1 grade.

2, the production cost of the utility model material cost all has bigger reduction.

3, the utility model product model machine is through Anhui Province's metrology and measurement institute stand the test, and precision is 1 grade, and low discharge is also very accurate, does not axially have jumping effect, can substitute vortex shedding flow meter.

Description of drawings:

Fig. 1 is the prior art structural representation.

Fig. 2 is the utility model structural representation.

Fig. 3 is the utility model probe structure synoptic diagram.

Fig. 4 is the utility model signal processing circuit schematic diagram.

Number in the figure: 1 flowtube, 2 triangular prisms, 3 probes, 4 permanent magnets, 5 signal processing systems, 6 displays, 7 binding posts, 8 sensors.

Below by embodiment the utility model is further described:

Embodiment:

Referring to Fig. 2, Fig. 3, in flowtube 1, triangular prism 2 is set routinely, at the back of triangular prism 2 probe 3 is set, with the outer setting permanent magnet 4 of the flowtube 1 of probe 3 corresponding positions, constitute signal transducers with probe 3 and permanent magnet 4.

In concrete the enforcement, probe 3 is the needle-like conductive body, vertically is suspended in the central authorities of flowtube 1, and the afterbody of probe 3 places the outside of flowtube 1, and by the binding post 7 that has been threaded, detectable signal is drawn on binding post 7.

According to the Karman vortex street principle, when having fluid to flow through in the flowtube 1, because the existence of triangular prism 2 produces resistance, make the fluid shunting, thereby before probe 3, can produce eddy current; Simultaneously on this position because the existence of permanent magnet 4, can produce a high-intensity magnetic field, according to the Faradic electricity magnetic induction principle, the athletic meeting of eddy current produces induced electromotive force, therefore probe 3 will produce induced electromotive force, and sends signal to signal processing system 5 by probe 3;

Signal processing system: in the outside of flowtube 1, be provided with the signal processing system 5 of display 6 in a conventional manner, from analysis and the calculating of the signal of probe 3 through signal processing system 5, flow value=k-factor * signal pulse value, flow value is reflected in instantaneous delivery, and flow added up, in display 6 in advance to show.

Signal acquiring system: in concrete the enforcement, probe 3 can adopt stainless steel machine-shaping, and its effect is exactly to produce induced electromotive force according to the Faradic electricity magnetic induction principle, and sends induced current to signal processing system; Permanent magnet 4 can adopt Nd-Fe-B magnet steel, right cylinder 10*38CM, and magnetic field intensity is 5000 Gausses---8000 Gausses, arbitrarily polar surface is put into pickup groove, and pickup groove is over against answering probe location, and in the back of triangular prism 2, forms high-intensity magnetic field; The eddy current that flows will produce induced electromotive force, and send induced current to signal processing system 5 by probe 3 according to the Faradic electricity magnetic induction principle on probe 3;

Referring to Fig. 4, signal processing in the utility model partly is made up of single-chip microcomputer M430F147, digital circuit OP281, OP193 and LCD liquid crystal display etc., the induced current that produces on the probe 3 is carried JP6 through lead, amplify through amplifier OP193 and OP281, processing through four road two-way switch CD4066BM and four road input nand gate CD4011BCM, give single-chip microcomputer M430F147 with digital signal, analytical calculation by M430F147, after the brilliant LCD of JP8 liquor charging show with digital form.

Claims

1, magnetic vortex street flowmeter, it is characterized in that in flowtube (1), being provided with triangular prism (2), at the back of triangular prism (2) probe (3) is set, with the outer setting permanent magnet (4) of the flowtube (1) of probe (3) corresponding position, constitute signal transducer with described probe (3) and permanent magnet (4), described probe (3) is the needle-like conductive body, vertically be suspended in the central authorities of flowtube (1), the afterbody of probe (3) places the outside of flowtube (1), and being connected with binding post (7), detectable signal is drawn on binding post (7).