CN105091955A - A vortex street flowmeter for coal mines - Google Patents
A vortex street flowmeter for coal mines Download PDFInfo
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- CN105091955A CN105091955A CN201510187753.2A CN201510187753A CN105091955A CN 105091955 A CN105091955 A CN 105091955A CN 201510187753 A CN201510187753 A CN 201510187753A CN 105091955 A CN105091955 A CN 105091955A
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Abstract
The invention provides a vortex street flowmeter for coal mines. The vortex street flowmeter comprises a flow pipe; a triangular prism is arranged in the flow pipe; a probe is arranged behind the triangular prism; the outer portion of the flow pipe is provided with a permanent magnet at the position corresponding to the position of the probe; the probe and the permanent magnet form a signal sensor; the probe is a needle-like electric conductor and is suspended at the center of the flow pipe vertically; the tail portion of the probe is located outside the flow pipe and is connected with a binding post; detection signals are led out from the binding post; the binding post of the probe is connected to a signal processing system. The vortex street flowmeter for coal mines realizes immunity against 2g@10-110Hz omni-directional vibration disturbance, and has a range ratio of 60:1 and a resistance coefficient as low as 0.8-1.12, with the pressure loss being only 50% that of the national standard. The vortex street flowmeter has no signal transduction holes/gaps, thereby being hygiene and safe; the vortex street flowmeter can be controlled accurately by using different mobile terminals, thereby being convenient to use; the vortex street flowmeter is reasonable in structure, safe and explosion-proof.
Description
Technical field
The present invention relates to liquid meter technical field, be specially a kind of colliery vortex shedding flow meter.
Background technology
Vortex shedding flow meter is applied to the detection of fluid flow, is used in the industries such as oil, chemical industry, food, medicine, smelting in a large number both at home and abroad.Traditional vortex shedding flow meter is made up of flowtube, triangular prism, sensor, signal processing system and display etc., according to Karman vortex street principle, when having fluid to flow through in flowtube, due to trequetrous existence, resistance can be produced, make divided fluid stream, can produce eddy current in the front of sensor like this, sensor just produces induced signal because of eddy current, and sends their quantity to signal processing system, by analysis and calculate, carry out in digital form in the display showing in out; The main Problems existing of flowmeter of this version is: 1, axially have jumping effect: because many flowmeters in use, most and the pump housing links, because the vibration of pump is very large, can produce and vibrate up and down, cause the flowtube and then vibration of flowmeter, so also just have impact on the normal generation of eddy current, have impact on metric results; 2, low discharge is not very accurate: because the eddy current produced during low discharge is very little, and the induced signal numerical value that sensor produces is inconsistent, and it is not very accurate for causing low discharge to measure; 3, its signal acquiring system is made up of triangular prism and sensor, and production cost is high.
Vortex flowmeter signals possesses following characteristics: 1, signal spectrum is wide, and typical signal spectrum is from 0.3HZ until 3500HZ. crosses over more than 13 octaves; 2, range ratio scope is large, reaches 100:l.The intensity proportional of vortex signal in vortex signal frequency square, the difference of signal amplitude is up to 10000 times thus.Vortex shedding flow meter in actual applications, because in-site installation precision and pipe arrangement precision, flow development length deficiency cause low frequency (relative to the vortex signal) disturbance that ubiquity in signal spectrum is stronger, other covers whole signal spectrum scope as all kinds of undesired signals such as flow noise, resonance interference, Management of Pipeline Mechanical Equipment vibrations.Conventional vortex signal treatment circuit, with reference to figure 1, the amplitude versus frequency characte intrinsic according to vortex signal, the signal that flow sensor gathers is after charge amplifier, employing frequency equalizer amplifies, the circuit mode that amplitude limit clamp amplifies, signal amplitude is amplified to phase same level, so that late-class circuit carries out frequency detecting, complete the conversion of frequency and electric current again, this traditional signal processing mode only can process the misfortune street signal of about 10:1 mileage scope, the vortex signal of 100:1 can be reached for reality, low-frequency interference signal will be caused significantly to be amplified because of frequency equilibrium, flood real vortex signal on the contrary, rear class frequency detection circuit is made to produce " leaky wave " phenomenon, even low-frequency interference signal is identified as flow signal mistakenly, precision significantly declines, amplitude limiter circuit in essence strongly non-linear, causes a large amount of generations of signal harmonic, and make each frequency divide dish intermodulation, make signal spectrum deterioration, interference even destroys the pickup of true vortex signal frequency, reduce vortex flow sensors precision.
Summary of the invention
Technical matters solved by the invention is to provide a kind of colliery vortex shedding flow meter, to solve the problem in above-mentioned background technology.
Technical matters solved by the invention realizes by the following technical solutions:
A kind of colliery vortex shedding flow meter, comprise: flowtube, in described flowtube, triangular prism is set, probe is set at described trequetrous back, at the outer setting permanent magnet of the flowtube with probe corresponding position, formed signal transducer with described probe and permanent magnet; Described probe is needle-like conductive body, is vertically suspended in the central authorities of flowtube, and the afterbody of probe is placed in the outside of flowtube, and is connected with binding post, and detectable signal is drawn on binding post, and the binding post of probe is connected to signal processing system.
Preferably, described signal processing system comprises by single-chip microcomputer M430F147, digital circuit OP281, OP193, signal amplification circuit and LCD liquid crystal display, and signal amplification circuit is connected between probe and single-chip microcomputer M430F147.
Preferably, described signal amplification circuit is that the output of charge amplifier module is through coupling capacitor C1, resistance RI is connected to 2 pin of amplifier UlA, 2 pin of UlA are connected the feedback resistance R3 of feedback capacity C2 and serial connection with output Z pin, R4, ground connection after the 3 pin connection balance resistance R2 of amplifier U1A, the output of amplifier UlA is except being supplied to postorder circuit, also access on divider resistance R7, the other end of divider resistance R7 and divider resistance R8 together access the base stage of triode Q1, divider resistance R8 other end ground connection, the grounded emitter of triode Q1, collector respectively with resistance R6, the positive pole of electric capacity C4, the grid of field effect transistor Q2 is connected, the other end of resistance R6 connects positive source, the negative pole of electric capacity C4 connects power supply mid point, field effect transistor Q2 drain electrode and resistance RS, the positive pole of electric capacity C3 is connected, positive source is connect after the source electrode of field effect transistor Q2 is connected with resistance RS, feedback resistance R3 in the negative pole of electric capacity C3 and charge amplifier module, R4 is connected respectively.
When there being fluid to flow through in flowtube, due to trequetrous existence, producing resistance, making divided fluid stream, thus can produce eddy current before probe; Simultaneously on this position due to the existence of permanent magnet, a high-intensity magnetic field can be produced, the athletic meeting of eddy current produces induced electromotive force, therefore probe will produce induced electromotive force and export as detection signal, again by follow-up signal processing system analytical calculation, show in out in the display in digital form.
Compared with public technology, there is following advantage in the present invention: the present invention can make immune 2g10 ~ 110Hz omnidirectional vibration interference, and there is the range ratio of 60:1, the resistance coefficient that simultaneously can realize being low to moderate 0.8 ~ 1.12 is only the pressure loss of GB 50%, in addition, and no signal conduction hole/gap safe and sanitary of the present invention, different mobile terminals can be used to carry out accurately control easy to use, meanwhile, the present invention is rational in infrastructure, can safety anti-explosive.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention.
Fig. 2 is signal amplification circuit circuit diagram of the present invention.
Embodiment
Object is reached and effect is easy to understand in order to make technological means of the present invention, creation characteristic, workflow, using method, below in conjunction with the embodiment of the present invention, technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
As shown in Figure 1, a kind of colliery vortex shedding flow meter, comprise: flowtube, in flowtube 1, triangular prism 2 is set routinely, probe 3 is set at the back of triangular prism 2, at the outer setting permanent magnet 4 of the flowtube 1 with probe 3 corresponding position, is formed signal transducer with probe 3 and permanent magnet 4.Described probe 3 is needle-like conductive body, is vertically suspended in the central authorities of flowtube 1, and the afterbody of probe 3 is placed in the outside of flowtube 1, and has been threaded connection binding post 7, and detectable signal is drawn on binding post 7.
According to Karman vortex street principle, when having fluid to flow through in flowtube 1, due to the existence of triangular prism 2, producing resistance, making divided fluid stream, thus can produce eddy current before probe 3; Simultaneously on this position due to the existence of permanent magnet 4, can produce a high-intensity magnetic field, according to faraday electromagnetic 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.
Described signal processing system is located at the outside in flowtube 1, the signal processing system 5 being provided with display 6 in a conventional manner from the signal of probe 3 through the analysis and calculation of signal processing system 5, flow value=k-factor * signal pulse value, flow value is reflected in instantaneous delivery, and flow is added up, in advance with display in display 6.
Particularly, probe 3 can adopt stainless steel machine-shaping, and its effect is exactly produce induced electromotive force according to faraday electromagnetic induction principle, and sends induced current to signal processing system; Permanent magnet 4 can adopt iron boron magnet steel by the emperor himself, right cylinder 10*38cm, magnetic field intensity is 5000 Gauss-8000 Gausses, any polar surface puts into pickup groove, the positive corresponding probe location of pickup groove, and after triangular prism 2, form high-intensity magnetic field, the eddy current of flowing, according to faraday electromagnetic induction principle, will produce induced electromotive force, and send induced current to signal processing system 5 by probe 3 on probe 3.
Described signal processing system 5 comprises by single-chip microcomputer M430F147, digital circuit OP281, OP193, signal amplification circuit and LCD liquid crystal display, and signal amplification circuit is connected between probe 3 and single-chip microcomputer M430F147.
As shown in Figure 2, described signal amplification circuit is that the output of charge amplifier module is through coupling capacitor C1, resistance RI is connected to 2 pin of amplifier UlA, 2 pin of UlA are connected the feedback resistance R3 of feedback capacity C2 and serial connection with output Z pin, R4, ground connection after the 3 pin connection balance resistance R2 of amplifier U1A, the output of amplifier UlA is except being supplied to postorder circuit, also access on divider resistance R7, the other end of divider resistance R7 and divider resistance R8 together access the base stage of triode Q1, divider resistance R8 other end ground connection, the grounded emitter of triode Q1, collector respectively with resistance R6, the positive pole of electric capacity C4, the grid of field effect transistor Q2 is connected, the other end of resistance R6 connects positive source, the negative pole of electric capacity C4 connects power supply mid point, field effect transistor Q2 drain electrode and resistance RS, the positive pole of electric capacity C3 is connected, positive source is connect after the source electrode of field effect transistor Q2 is connected with resistance RS, feedback resistance R3 in the negative pole of electric capacity C3 and charge amplifier module, R4 is connected respectively.
More than show and describe ultimate principle of the present invention, principal character and advantage of the present invention.The technician of the industry should understand; the present invention is not restricted to the described embodiments; what describe in above-described embodiment and instructions just illustrates principle of the present invention; without departing from the spirit and scope of the present invention; the present invention also has various changes and modifications, and these changes and improvements all fall in the claimed scope of the invention.Claimed scope of the present invention is defined by appending claims and equivalent thereof.
Claims (3)
1. a colliery vortex shedding flow meter, comprise: flowtube, it is characterized in that: in described flowtube, triangular prism is set, probe is set at described trequetrous back, at the outer setting permanent magnet of the flowtube with probe corresponding position, formed signal transducer with described probe and permanent magnet; Described probe is needle-like conductive body, is vertically suspended in the central authorities of flowtube, and the afterbody of probe is placed in the outside of flowtube, and is connected with binding post, and detectable signal is drawn on binding post, and the binding post of probe is connected to signal processing system.
2. a kind of colliery according to claim 1 vortex shedding flow meter, it is characterized in that: described signal processing system comprises by single-chip microcomputer M430F147, digital circuit OP281, OP193, signal amplification circuit and LCD liquid crystal display, signal amplification circuit is connected between probe and single-chip microcomputer M430F147.
3. a kind of colliery according to claim 2 vortex shedding flow meter, it is characterized in that: described signal amplification circuit is that the output of charge amplifier module is through coupling capacitor C1, resistance RI is connected to 2 pin of amplifier UlA, 2 pin of UlA are connected the feedback resistance R3 of feedback capacity C2 and serial connection with output Z pin, R4, ground connection after the 3 pin connection balance resistance R2 of amplifier U1A, the output of amplifier UlA is except being supplied to postorder circuit, also access on divider resistance R7, the other end of divider resistance R7 and divider resistance R8 together access the base stage of triode Q1, divider resistance R8 other end ground connection, the grounded emitter of triode Q1, collector respectively with resistance R6, the positive pole of electric capacity C4, the grid of field effect transistor Q2 is connected, the other end of resistance R6 connects positive source, the negative pole of electric capacity C4 connects power supply mid point, field effect transistor Q2 drain electrode and resistance RS, the positive pole of electric capacity C3 is connected, positive source is connect after the source electrode of field effect transistor Q2 is connected with resistance RS, feedback resistance R3 in the negative pole of electric capacity C3 and charge amplifier module, R4 is connected respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510187753.2A CN105091955A (en) | 2015-04-21 | 2015-04-21 | A vortex street flowmeter for coal mines |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510187753.2A CN105091955A (en) | 2015-04-21 | 2015-04-21 | A vortex street flowmeter for coal mines |
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| CN105091955A true CN105091955A (en) | 2015-11-25 |
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| CN201510187753.2A Pending CN105091955A (en) | 2015-04-21 | 2015-04-21 | A vortex street flowmeter for coal mines |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115560809A (en) * | 2022-11-22 | 2023-01-03 | 河北讯辉科技股份有限公司 | Automatic industrial metering system |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2544256Y (en) * | 2002-05-27 | 2003-04-09 | 温州富马仪表厂 | Electromagnetic vortex flowmeter |
| CN1831487A (en) * | 2006-04-06 | 2006-09-13 | 滁州市金科仪器仪表有限公司 | Magnetic vortex street flowmeter |
| RU2310816C2 (en) * | 2005-08-04 | 2007-11-20 | Федеральное государственное унитарное предприятие "Государственный научный центр Российской Федерации Научно-исследовательский институт атомных реакторов" | Vortex electromagnetic converter of liquid metal flow rate |
| CN101608941A (en) * | 2008-06-20 | 2009-12-23 | 李旭 | Intelligent magnetic vortex flow detection control system |
| CN204241041U (en) * | 2014-10-22 | 2015-04-01 | 大连美天三有电子仪表有限公司 | A kind of magnetic vortex street flowmeter |
-
2015
- 2015-04-21 CN CN201510187753.2A patent/CN105091955A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2544256Y (en) * | 2002-05-27 | 2003-04-09 | 温州富马仪表厂 | Electromagnetic vortex flowmeter |
| RU2310816C2 (en) * | 2005-08-04 | 2007-11-20 | Федеральное государственное унитарное предприятие "Государственный научный центр Российской Федерации Научно-исследовательский институт атомных реакторов" | Vortex electromagnetic converter of liquid metal flow rate |
| CN1831487A (en) * | 2006-04-06 | 2006-09-13 | 滁州市金科仪器仪表有限公司 | Magnetic vortex street flowmeter |
| CN101608941A (en) * | 2008-06-20 | 2009-12-23 | 李旭 | Intelligent magnetic vortex flow detection control system |
| CN204241041U (en) * | 2014-10-22 | 2015-04-01 | 大连美天三有电子仪表有限公司 | A kind of magnetic vortex street flowmeter |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115560809A (en) * | 2022-11-22 | 2023-01-03 | 河北讯辉科技股份有限公司 | Automatic industrial metering system |
| CN115560809B (en) * | 2022-11-22 | 2023-02-28 | 河北讯辉科技股份有限公司 | Automatic industrial metering system |
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Application publication date: 20151125 |