阅读说明：本技术 一种新型电磁流量计 (A kind of New Electromagnetic Flowmeter ) 是由 李雪菁 张进明 王灿 任学弟 于 2019-09-05 设计创作，主要内容包括：本发明公开了一种具有正交励磁的电磁流量计,包括两组正交励磁模块,两组励磁模块交替工作,内径为D的供导电流通流动的传感器管道,在感应磁场范围内的测量管道上,两组电极X1、X2和Y1、Y2,两组电极连线正交,流体以流速V通过时,在磁场的作用下,分别产生感应电势E1和E2,感应电势E1和E2均正比于B×V,且所述E1和E2与测量管内的液位H有关,且0≤h≤D,h＝D时为满管状态；将传统电磁流量计单励磁模块增加为一对励磁模块,且互相垂直,通过测得的感应电势计算非满管流速V和液位h,进而得到流量Q,解决了对非满管流量和液位进行同时测量,避免了电极极化造成的测量误差对测量结果的影响。(The invention discloses a kind of electromagnetic flowmeters with orthogonal excitation, including two groups of orthogonal excitation modules, two groups of excitation modules work alternatively, the sensor tube moved for conductive circulation stream that internal diameter is D, on measurement pipeline within the scope of induced magnetic field, two arrays of electrodes X1, X2 and Y1, Y2, two arrays of electrodes line is orthogonal, when fluid is passed through with flow velocity V, under the influence of a magnetic field, induced potential E1 and E2 are generated respectively, induced potential E1 and E2 are proportional to B × V, and the E1 and E2 is related with the liquid level H in measurement pipe, and is full pipe condition when 0≤h≤D, h=D；Traditional electromagnetic flowmeter list excitation module is increased as a pair of of excitation module, and it is orthogonal, non-full pipe flow velocity V and liquid level h is calculated by the induced potential measured, and then obtain flow Q, it solves and non-full pipe flow and liquid level is carried out while being measured, avoid influence of the measurement error caused by electrode polarization to measurement result.)

1. a kind of New Electromagnetic Flowmeter, including the first excitation wire module (1) and the second excitation wire module (2), the first excitation mould Block (3) and the second excitation module (4) work alternatively, when the conductive fluid in sensor tube (5) is passed through with flow velocity, by magnetic field Excitation control (7), control produce magnetic field Bx, By perpendicular to pipeline radial direction, generate positive and negative induction under positive and negative constant current excitation Potential E1 and E2, through signal amplification module (6) and digital processing module (8).

2. a kind of New Electromagnetic Flowmeter according to claim 1, it is characterised in that: the induced potential E1 and E2 is by passing The two pairs of electrodes X1, X2 and Y1 and Y2, output signal of sensor are respectively outputted to signal amplifier.

3. a kind of New Electromagnetic Flowmeter according to claim 1, it is characterised in that: under the orthogonal excitation, fluid When flowing through space where magnetic field with flow velocity v, cutting magnetic line, generated respectively on two pairs of electrodes X1, X2 and Y1 and Y2 with flow velocity, Two-dimentional induced potential the signal E1 and E2 of the relating to parameters such as liquid level；It is the output letter linear with flow velocity by E1 and E2 processing Number, the liquid level h of fluid, flow velocity v and conducting liquid impedance Z can be solved by obtaining equation group (1) then₁, realize non-full pipe flow Q's Measurement.

4. a kind of New Electromagnetic Flowmeter according to claim 1, it is characterised in that: orthogonal excitation process, it is obtained Flow signal eliminates polarizing voltage interference and Hz noise；Magnetic field Bx, By that magnetic field excitation generates are to motivate power frequency synchronous Signal starts, and after receiving synchronization signal, after the transient time reaches stable state, into positive excitation BX, carries out flow number According to acquisition；After data acquire, positive exciting current is closed；When next synchronization signal arrives, into reversed excitation Process By acquires data after the transient time reaches stable state, and acquisition time is finished with positive excitation process when data acquire, Close exciting current.

5. according to claim 1, the output U of signal amplifier, the amplification factor A of signal amplifier, signal amplifier input Impedance Z o, fluid impedance are Z₁,K_sFor instrument coefficient.

6. a kind of New Electromagnetic Flowmeter according to claim 2, it is characterised in that: signal E1 and the E2 right and wrong detected It is often faint, it needs to carry out two-stage amplification.

7. a kind of New Electromagnetic Flowmeter according to claim 4, it is characterised in that: carry out high power to small-signal and put Greatly, it is easy to it is faint to introduce interference；To avoid interfering with each other for system components, the anti-interference ability of measurement is improved, by system Power supply is divided into three parts: excitation part, analog signal amplifier section and signal process part；Electromagnetic flowmeter uses multichannel Output switch power source is powered to each section, and each section passes through photoelectrical coupler between each other and contacted.

Technical field

The invention belongs to electromagnetic flowmeter technical fields, and in particular to a kind of New Electromagnetic Flowmeter.

Background technique

The basic principle of electromagnetic flowmeter is Faraday's electromagnetic induction law.The excitation wire of traditional list excitation electromagnetic flowmeter The magnetic field excitation intensity B generated is enclosed, when conducting fluid is flowed in the pipeline using D as diameter with speed v, two surveys Measure interelectrode induced potential E=B × V × D.Traditional single excitation electromagnetic flowmeter cannot measure non-full pipe flow, And the conductivity of conductive fluid there are certain requirements, it is not capable of measuring low conductivity fluid.

In recent years, China is to the positive pay attention to day by day of environmental protection.The conveyance conduit of water resource system or waste water drainage system is usually located In non-full pipe flow state, and waste water is usually from low conductivity fluid.If lacking corresponding non-full pipe flow and low conductance Rate fluid measurement method and its instrument, it is clear that be difficult to meet the energy-saving and emission-reduction detection requirement of pipeline discharge traffic management.Currently, I State uses the electromagnetic type non-full pipe flow instrument for above depending on foreign countries.And foreign countries' Meter cost is very high, makes China in water Power, irrigation, plumbing and blowdown are difficult to largely non-full pipe measurement method be used to go fully and effectively to carry out energy-saving and emission-reduction in administering Monitoring.

Summary of the invention

It is an object of the invention to have to for traditional electromagnetic flowmeter just for full packages fluid and fluid conductivity The test problems asked provide a kind of New Electromagnetic Flowmeter, which has two pairs of excitation modules, can form orthogonal magnetic , and it is directed to inductive signal feature, propose sub-module: excitation part, magnetic field excitation control, analog signal amplifier section sum number The control of word signal processing and power supply system.

In order to achieve the above object, conception of the invention is:

The present invention provides a kind of electromagnetic flowmeter with orthogonal excitation, there are two pairs of vertical excitation moulds outside measurement pipe Block generates orthogonal excitation field.The characteristics of being directed to induced potential signal simultaneously, power-supply system is powered using sub-module.Pass through Induced potential signal obtains the measurement of non-full pipe flow velocity Yu liquid level, fluid conductivity.

Conceived according to foregoing invention, using following technical scheme:

A kind of orthogonal excitation electromagnetic flowmeter includes that internal diameter is the measurement pipeline of D.Two pairs of installation is hung down mutually on the outside of measurement pipe Straight excitation module, it is characterised in that the measurement pipeline is placed in orthogonal induced magnetic field, and measurement pipeline has two pairs of electrodes.Two It is orthogonal to electrode connecting line.By establishing flow velocity, liquid level, fluid impedance and the relationship of induced potential, to realize to non-full pipe liquid The measurement of position and fluid conductivity.

Imagined according to foregoing invention, the invention adopts the following technical scheme:

A kind of electromagnetic flowmeter with orthogonal excitation, including the first excitation wire module and the second excitation wire module, two groups Excitation module works alternatively, the sensor tube moved for conductive circulation stream that internal diameter is D, the measurement pipe within the scope of induced magnetic field On road, two arrays of electrodes X1, X2 and Y1, Y2, two arrays of electrodes line is orthogonal.When fluid is passed through with flow velocity V, under the influence of a magnetic field, Induced potential E1 and E2 are generated respectively, and induced potential E1 and E2 are proportional to B × V.And the liquid in the E1 and E2 and measurement pipe Position H is related, and is full pipe condition when 0≤h≤D, h=D.

In above-mentioned electromagnetic flowmeter, two pairs of electrodes X1 X2 and the Y1Y2 line in measurement pipe is mutually perpendicular to.Described The magnetic field Bx and Y1 and Y2 line of excitation module induction is orthogonal, and the magnetic field By and X1 and X2 line of excitation module induction is mutual Vertically.

In above-mentioned electromagnetic flowmeter, the liquid level h and electrode X1, X2 line in pipeline are parallel to each other, X1, X2 measurement Inductive signal Ex=f (H, D, Bx, V, Z₁).Inductive signal Ey=f (H, D, Bx, V, the Z of Y1, Y2 measurement₁).Wherein, f (H, D, Bx,V,Z₁)、f(H,D,Bx,V,Z₁) determined by fitting experimental data.

In above-mentioned electromagnetic flowmeter, detection signal Ex and Ey are amplified by amplifier, corresponding amplification coefficient For Ax and Ay.Amplified signal is respectively X=Ax × Ex and Y=Ay × Ey.

In above-mentioned electromagnetic flowmeter, system power supply is divided into three parts: excitation part, analog signal amplifier section sum number Word signal processing, and each section passes through photoelectrical coupler between each other and is contacted.

Compared with prior art, the beneficial effects of the present invention are:

1. it is a pair of of excitation module that traditional electromagnetic flowmeter list excitation module, which is increased, and orthogonal.Pass through what is measured Induced potential calculates non-full pipe flow velocity V and liquid level, fluid impedance Z₁, and then obtain flow Q.

Detailed description of the invention

Fig. 1 is the structure chart of the New Electromagnetic Flowmeter of invention；

Fig. 2 is the sensor structure figure of the New Electromagnetic Flowmeter of invention；

Fig. 3 is the orthogonal excited work timing diagram of invention；

Fig. 4 is the power supply system structure chart of invention；

Fig. 5 is single excitation electromagnetic flowmeter schematic diagram of invention.

In figure: 1, the first excitation wire module；2, the second excitation wire module；3, the first excitation module；4, the second excitation module； 5, sensor tube；6, signal amplification module；7, magnetic field excitation controls；8, digital processing module.

Specific embodiment

Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other Embodiment shall fall within the protection scope of the present invention.