CN105583203A - Magneto vibration descaling and scale preventing device of magnetic conduction flow conveying pipe and excitation frequency calculating method - Google Patents

Abstract

Provided are a magneto vibration descaling and scale preventing device of a magnetic conduction flow conveying pipe and an excitation frequency calculating method. The device comprises a single-chip microcomputer main control panel, an LED display control module, a liquid crystal display screen alarm module, a keyboard input module, a work mode adjusting module, a coil power real-time monitoring module, a power supply module, a power amplification module and power coil. According to the characteristic that the straight flow conveying pipe made of a ferro magnetic material conducts magneto high-frequency vibration under the excitation of an alternating electromagnetic field and the linear relation between the vibration frequency of the flow conveying pipe and excitation frequency, the resonant frequency of the flow conveying pipe is obtained by calculating the vibration equation of the flow conveying pipe, so that the flow conveying pipe vibrates at an inherent frequency state, and then scale and other dirt in the pipe wall are made to fall off and be taken away by running water through high-frequency vibration. The magneto vibration descaling and scale preventing device of the magnetic conduction flow conveying pipe and the excitation frequency calculating method have the beneficial effects of saving energy, being environment-friendly, safe, reliable and high in controllability and the like.

Description

Mangneto vibration descaling and antiscaling device and the driving frequency computational methods of magnetic conduction pipe conveying fluid

Technical field

The present invention relates to descaling and antiscaling field, the especially a kind of vibration of the mangneto for magnetic conduction pipe conveying fluid scale removal is anti-Dirt device.

Background technology

Incrustation scale problem is the subject matter of all kinds of heat exchange industrial equipments of puzzlement always, as boiler and cooling tower etc.In order to remove descale, the initial method using is chemical method. Chemical method is exactly with occurring with incrustation scaleThe scale removal reagent of chemical reaction rinses aqueduct, makes incrustation scale generate water-soluble salt, and then by currentWash away. Although chemical cleaning method can effectively solve incrustation scale problem, has also series of problems,Taking China as example, every year in order to clean boiler and the heat exchanger of hundreds thousand of times, need to consume number in ten thousand tonsChemicals, this has not only wasted a large amount of manpower and materials, and remaining chemicals causes environmentSerious pollution. Therefore under this background, physical scale inhibition method is widely used gradually.

Mostly physical scale inhibition method is to utilize the extraneous field amounts such as sound wave, light wave, electric field and magnetic field to industrial water systemSystem and system directly or indirectly act on, thereby realize the object of descaling and antiscaling. Generally should in the marketWith power coil class hydrotreater be exactly a kind of descaling and antiscaling device based on alternating electromagnetic field, but its scale removalAntiscale mechanism is also indefinite. The design of a lot of such devices and use are all can change based on alternating electromagnetic fieldThe hypothesis of aqueous fluid microstructure and physico-chemical property, but in the practical application of industrial process, result of use is butAnd unstable. Moreover, the phenomenon that such descaling and antiscaling equipment produces in application also with above-mentioned hypothesisThe effect producing is not inconsistent, for example, and when power coil is wrapped on the serious boiler water-supply-pipe of fouling and is handing overBecome when excitation is lower produces alternating electromagnetic field, after effect a period of time, the incrustation scale of boiler inner wall can be the de-of bulkFall, often can stop up water-supply-pipe, when serious, even cause the bursting of boilers, therefore, as far back as twentieth century 70-80In the age, China just puts into effect corresponding policies and regulations for this technology application without basis, regulation power lineThe descaling and antiscaling equipment of circle class, is not directly applied in a pipe network of steam generator system, stops such technologyApply caused production major accident.

The theoretical foundation of such device design and application, remains alternating electromagnetic field and can change aqueous fluid at presentThe hypothesis of microstructure and physico-chemical property, but in industrial practical application, power coil is wound aroundPipe conveying fluid is often the water pipe of ferrimagnet, and according to magnetic field and magnetic circuit theory, ferromagnetism water pipe is to power lineThe magnetic field that circle produces has electromagnetic shielding action, and the magnetic field that power coil produces cannot see through water wall and be applied toIn inner aqueous fluid. Therefore, act on the vacation of water pipe internal water fluid microcosmic point about alternating electromagnetic fieldSaying, is invalid in actual applications. From another angle, up to the present in industrial production based onThe design and application of the descaling and antiscaling device of power coil, still lacks correct theoretical foundation.

Summary of the invention

The object of the invention is to provide a kind of working stability, efficiency is high, controllability is strong for magnetic conduction pipe conveying fluidMangneto vibration descaling and antiscaling device.

For achieving the above object, adopted following technical scheme: device of the present invention comprises single-chip microcomputer master controlMaking sheet, LED display control module, LCDs, power amplifier driver module, power amplifier module, powerCoil, alarm module, power power-supply module, coil power Real-Time Monitoring module, keyboard input module, workOperation mode adjustment module, starting switch and reset switch; Wherein, coil power Real-Time Monitoring module, keyDish input module, mode of operation adjustment module are passed through wire harness with the signal input part of single-chip microcomputer master board respectivelyConnect, the signal output part of single-chip microcomputer master board respectively with LED display control module, power amplifier driver module,Alarm module connects, and LED display control module is connected with LCDs, and power amplifier driver module and power are putLarge module connects, and the power take-off of power amplifier module connects power coil, the input of power amplifier moduleEnd is connected with power power-supply module; Starting switch is connected with single-chip microcomputer master board respectively to dress with reset switchPut the control that starts, resets.

Further, described power coil can be single group coil, also can form by organizing coils from parallel connection of coils more.

Further, described device can be used in conjunction with sedimentation system.

Driving frequency computational methods based on above-mentioned descaling and antiscaling device, power coil is wrapped in ferromagnetismOn pipe conveying fluid outer wall, power coil produces dither, and the mechanism of dither is magnetostriction vibration, ironThe descaling and antiscaling effect of magnetic pipe conveying fluid is relevant to the alternation exciting signal frequency in power coil, obtains optimumThe method step of exciting signal frequency is as follows:

(1) according to magnetostriction principle, the alternating electromagnetism field action that ferromagnetism pipe conveying fluid produces at power coilThere is dither in lower meeting, its vibration frequency and exciting signal frequency are linear, and relational expression is:

f_out＝2f_in(1)

In formula (1), f_outFor pipe conveying fluid vibration frequency, f_inFor exciting signal frequency;

(2), in the time that pipe conveying fluid vibration frequency equals self intrinsic frequency, it is maximum that the oscillation intensity of pipe conveying fluid reaches,Realize resonance; The vibration equation of defeated stream straight tube is:

$EI\frac{{\∂}^4{w}_i}{\∂x^4}+({\mathrm{MV}}^2+{\mathrm{\Π}}_0)\frac{{\∂}^2{w}_i}{\∂x^2}+(M+m)\frac{{\∂}^2{w}_i}{\∂t^2}=0,(i=1,2)---\left(2\right)$

In formula (2), EI represents the bending stiffness of pipe conveying fluid; The quality of fluid under M representation unit length; VRepresent the flow velocity of tube fluid under stability state; The quality of pipe conveying fluid under m representation unit length; w₁And w₂Represent respectively the amount of deflection of two end faces of pipe; X represents when taking pipe conveying fluid axis left end during as the origin of coordinates, on axisThe distance of certain point and initial point; T represents the time; Π₀Represent the mobile stable state axial force producing of tube fluid, whenWhen pipe conveying fluid is straight tube, this parameter values is 0;

(3) according to the front 3 rank intrinsic frequencies of formula (2) acquisition pipe conveying fluid self, derive and calculate pipe conveying fluidIntrinsic frequency expression formula is:

${\mathrm{\Ω}}_i=\frac{i\mathrm{\π}}{L^2}\sqrt{\frac{i^2{\mathrm{\π}}^{2}EI-L^2({\mathrm{MV}}^2+{\mathrm{\Π}}_0)}{(M+m)}},(i=1,2,3)---\left(3\right)$

In formula (3), Ω_iFor the i rank intrinsic frequency of pipe conveying fluid, L is pipe conveying fluid length;

(4) pipe conveying fluid synchronous vibration energy is mainly distributed in second order intrinsic frequency, according to formula (1), for makingPipe conveying fluid reaches resonance state, and the pass of driving frequency and resonant frequency is:

$f_{in}=\frac{1}{2}{\mathrm{\Ω}}_2=\frac{\mathrm{\π}}{L^2}\sqrt{\frac{4{\mathrm{\π}}^{2}EI-L^2({\mathrm{MV}}^2+{\mathrm{\Π}}_0)}{(M+m)}}---\left(4\right).$

The course of work is roughly as follows:

Before work, power coil is wound on the straight length of pipe conveying fluid of ferromagnetic material, should be curved away from pipelinePars convoluta position. Need or pipe conveying fluid line laying characteristic according to scene, can connect multiple power coils simultaneously and twine respectivelyOn different pipe conveying fluids, between coil, be connected with parallel way. When work, LED display control module withKeyboard input module is used in conjunction with, and major function is to input on-the-spot pipe conveying fluid size ginseng by these two modulesNumber, material parameter, in-pipe flow flow parameters, in-tube fouling condition parameter etc., then calculate and can drawPlay the power coil driving frequency of pipe conveying fluid resonance. Then, send through power amplifier and drive by single-chip microcomputer master boardThe frequency data signal that dynamic model piece is optimized, this signal is applied to power by power amplifier module with voltage formCoil two ends, driving power coil produces alternating electromagnetic field in the pipe conveying fluid of ferrimagnet, encourages defeated streamPipe produces dither, reaches the object that the incrustation scale adhering on inside pipe wall is come off, and power power-supply module canAccording to the variation of field condition, regulating power coil power output in real time. When the every ginseng of on-the-spot pipe conveying fluid systemWhen number is difficult to determine, can mode of operation adjustment module be set by mode of operation adjustment module and makes pipe conveying fluid vibrationUnder wide-band pattern. Coil power Real-Time Monitoring module and alarm module are used in conjunction with, according to the defeated stream in sceneThe laying structure real-time inspection and control power coil power output of pipe, and then make pipe conveying fluid oscillation intensity appropriateness,Avoid causing due to high vibration the mechanical damage of pipe conveying fluid system. In addition, the bulk water falling in order to prevent from shakingDirt and dirt stop up pipe conveying fluid line, and this device can be used in conjunction with sedimentation system, improve the dirty function of row, keep awayExempt from blockage problem.

Compared with prior art, tool of the present invention has the following advantages:

1, can be by on-the-spot pipe conveying fluid dimensional parameters, material parameter, in-pipe flow flow parameters, in-tube fouling shapeThe parameters such as condition are set in device, can make pipe conveying fluid produce the merit of resonance by the automatic generation of SCM programRate coil stimulating frequency, utilizes alternating electromagnetic field to cause that ferromagnetic class pipe conveying fluid makes magnetostriction dither, shortMake the interior incrustation scale self falling of tube wall and taken away by current.

2, be widely used, highly versatile, power output are lower, energy-conserving and environment-protective, safe and reliable, have wideMarket prospects and good society and economic benefit.

Brief description of the drawings

Fig. 1 is system architecture schematic diagram of the present invention.

Fig. 2 is control panel structure chart of the present invention.

Fig. 3 is the magnetic line of force distribution map of power coil of the present invention at pipe conveying fluid pars intramuralis.

Fig. 4 is the schematic diagram that pipe conveying fluid vibrates under electromagnetic excitation effect of the present invention.

Fig. 5 is the pipe conveying fluid line structure schematic diagram with sedimentation.

Fig. 6 is the free vibration spectrogram of pipe conveying fluid.

Fig. 7 is the pipe conveying fluid rumble spectrum figure of driving frequency while being 408Hz.

Fig. 8 be driving frequency while being 268Hz pipe conveying fluid there is the rumble spectrum figure of resonance.

Drawing reference numeral: 1-single-chip microcomputer master board; 2-LED display control module; 3-LCDs; 4-Power amplifier driver module; 5-power amplifier module; 6-power coil; 7-alarm module; 8-power power-supplyModule; 9-coil power Real-Time Monitoring module; 10-keyboard input module; 11-mode of operation adjustment module;12-starting switch; 13-reset switch; 14-mode of operation change-over switch; 15-output current regulates and revolvesButton; 16-power power-supply starting switch; 17-output voltage adjusting knob; 18-power power-supply output displayLiquid crystal display; 19-pipe conveying fluid wall; The magnetic line of force that 20-power coil produces; 21-sedimentation; 22-defeated streamPipe.

Detailed description of the invention

Below in conjunction with accompanying drawing, the present invention will be further described:

As shown in Figure 1, device of the present invention comprise single-chip microcomputer master board 1, LED display control module 2,LCDs 3, power amplifier driver module 4, power amplifier module 5, power coil 6, alarm module 7, meritRate power module 8, coil power Real-Time Monitoring module 9, keyboard input module 10, mode of operation adjustment module11, starting switch 12 and reset switch 13; Wherein, coil power Real-Time Monitoring module, keyboard input mouldPiece, mode of operation adjustment module are connected by wire harness with the signal input part of single-chip microcomputer master board respectively, singleThe signal output part of sheet owner control panel respectively with LED display control module, power amplifier driver module, warning mouldPiece connects, and LED display control module is connected with LCDs, power amplifier driver module and power amplifier moduleConnect, the power take-off of power amplifier module connects power coil, the input of power amplifier module and meritRate power module is connected; Starting switch is connected device is carried out with single-chip microcomputer master board respectively with reset switchStart, reset and control.

Described power coil can be single group coil, also can form by organizing coils from parallel connection of coils more.

Described device can be used in conjunction with sedimentation system.

When system works, after the winding that completes power coil, open starting switch, first by monolithic owner8051 series monolithics of control panel inside, according to the program setting in advance, are inputted mould according to user by keyboard(input numerical value can be on LCDs for the on-the-spot waterline parameters of piece and the input of LED display moduleShow), calculate the driving frequency that can make water pipe resonance, then produce this frequency at the I/O of single-chip microcomputer mouthAlternation data signal, this data signal is after power amplifier driver module, by having power tube H bridge constructionPower amplifier module form the voltage excitation signals of alternation, this signal loading, at power coil two ends, makes lineThe inner alternating current that produces of circle, and and then at the inner alternating electromagnetic field that produces of water pipe. The work of power power-supply moduleWith the voltage input that is mainly regulating power amplification module, thus the current value to power coil inside indirectlyRegulate. The real-time detection module of coil power merit on Real-Time Monitoring power coil in system work processRate value, when the electric current of coil inside is excessive or when too small, can trigger alarm module. When due to other reasonsNeed to reset systematic parameter time, trigger reset switch, apparatus system is resetted.

There is in actual use according to apparatus of the present invention the phenomenon that incrustation scale in various degree becomes piece to come off,And a large amount of experimental verification conclusions, show that the principal element that incrustation scale comes off is that ferromagnetism pipe conveying fluid is at powerUnder coil stimulating, produce dither. The mechanism of this type of dither is magnetostriction vibration, therefore by shakingAlternation pumping signal in descaling and antiscaling effect and the power coil of movable property life is closely related, and theory and practice allProve, the Main Function of alternation excited signal is:

(1) according to magnetostriction principle, the alternating electromagnetism field action that ferromagnetism pipe conveying fluid produces at power coilThere is dither in lower meeting, its vibration frequency and exciting signal frequency are linear, and relational expression is:

f_out＝2f_in(1)

In formula (1), f_outFor pipe conveying fluid vibration frequency, f_inFor exciting signal frequency.

(2) intensity of pipe conveying fluid vibration is directly related with descaling and antiscaling effect, and the intensity of vibration is larger, defeatedThe intensity of stream tube vibration is larger, and descaling and antiscaling effect is better. Pipe conveying fluid oscillation intensity and power coil produceThe frequency of magnetic field intensity and pumping signal is relevant, and magnetic field intensity is larger, and pipe conveying fluid oscillation intensity is larger, andCurrent strength positive correlation in magnetic field intensity and power coil, and the frequency of pipe conveying fluid vibration more approaches pipe conveying fluidThe intrinsic frequency of self, the oscillation intensity of pipe conveying fluid is larger, when pipe conveying fluid vibration frequency equals consolidating of selfWhile having frequency, it is maximum that the oscillation intensity of pipe conveying fluid reaches, and realizes resonance. The vibration equation of defeated stream straight tube is:

$EI\frac{{\∂}^4{w}_i}{\∂x^4}+({\mathrm{MV}}^2+{\mathrm{\Π}}_0)\frac{{\∂}^2{w}_i}{\∂x^2}+(M+m)\frac{{\∂}^2{w}_i}{\∂t^2}=0,(i=1,2)---\left(2\right)$

In formula (2), EI represents the bending stiffness of pipe conveying fluid; The quality of fluid under M representation unit length; VRepresent the flow velocity of tube fluid under stability state; The quality of pipe conveying fluid under m representation unit length; w₁And w₂Represent respectively the amount of deflection of two end faces of pipe; X represents when taking pipe conveying fluid axis left end during as the origin of coordinates, on axisThe distance of certain point and initial point; T represents the time; Π₀Represent the mobile stable state axial force producing of tube fluid, whenWhen pipe conveying fluid is straight tube, this parameter values is 0;

(3) just can obtain the front 3 rank intrinsic frequencies of pipe conveying fluid self according to formula 2. Through derivation and calculating,Pipe conveying fluid intrinsic frequency expression formula is:

${\mathrm{\Ω}}_i=\frac{i\mathrm{\π}}{L^2}\sqrt{\frac{i^2{\mathrm{\π}}^{2}EI-L^2({\mathrm{MV}}^2+{\mathrm{\Π}}_0)}{(M+m)}},(i=1,2,3)---\left(3\right)$

In formula (3), Ω_iFor the i rank intrinsic frequency of pipe conveying fluid, L is pipe conveying fluid length.

Concrete derivation is as follows:

Pipe conveying fluid vibration equation

$EI\frac{{\∂}^{4}w}{\∂x^4}+({\mathrm{MV}}^2+{\mathrm{\Π}}_0)\frac{{\∂}^{2}w}{\∂x^2}+2MV\frac{{\∂}^{2}w}{\∂x\∂t}+(M+m)\frac{{\∂}^{2}w}{\∂t^2}=F(x,t)$

For asking intrinsic frequency, ignore damping term and outer sharp power item

$EI\frac{{\∂}^{4}w}{\∂x^4}+({\mathrm{MV}}^2+{\mathrm{\Π}}_0)\frac{{\∂}^{2}w}{\∂x^2}+(M+m)\frac{{\∂}^{2}w}{\∂t^2}=0$

If w (x, t)=W (x) T (t) has

$EI\frac{d^{4}W}{{\mathrm{dx}}^4}T+({\mathrm{MV}}^2+{\mathrm{\Π}}_0)\frac{d^{2}W}{{\mathrm{dx}}^2}T+(M+m)W\frac{d^{2}T}{{\mathrm{dt}}^2}=0$

Further have

$\begin{array}{cc}\⇒& \frac{EI\frac{d^{4}W}{{\mathrm{dx}}^4}+({\mathrm{MV}}^2+{\mathrm{\Π}}_0)\frac{d^{2}W}{{\mathrm{dx}}^2}}{(M+m)W}=-\frac{\frac{d^{2}T}{{\mathrm{dt}}^2}}{T}\end{array}={\mathrm{\Ω}}^2$

The first formula is the function of x, and the second formula is the function of t, and therefore Ω must be constant. There are thus following two equations

$\left\{\begin{array}{c}EI\frac{d^{4}W}{{\mathrm{dx}}^4}+({\mathrm{MV}}^2+{\mathrm{\Π}}_0)\frac{d^{2}W}{{\mathrm{dx}}^2}-{\mathrm{\Ω}}^2(M+m)W=0\\ \frac{d^{2}T}{{\mathrm{dt}}^2}+{\mathrm{\Ω}}^{2}T=0\end{array}\right.$

From the second formula, this Ω is also the intrinsic frequency of this vibration equation.

The characteristic equation of the first formula is

EIλ⁴+(MV²+Π₀)λ²-Ω²(M+m)＝0

Solve

λ_1,2＝±ω₁λ_3,4＝±iω₂

Wherein

${\mathrm{\ω}}_1=\sqrt{\frac{-({\mathrm{MV}}^2+{\mathrm{\Π}}_0)+\sqrt{{({\mathrm{MV}}^2+{\mathrm{\Π}}_0)}^2+4{\mathrm{EI\Ω}}^2(M+m)}}{2EI}}$

${\mathrm{\ω}}_2=\sqrt{\frac{({\mathrm{MV}}^2+{\mathrm{\Π}}_0)+\sqrt{{({\mathrm{MV}}^2+{\mathrm{\Π}}_0)}^2+4{\mathrm{EI\Ω}}^2(M+m)}}{2EI}}$

There is the solution of W to be

$\begin{array}{c}W=C_1{e}^{{\mathrm{\ω}}_{1}x}+C_2{e}^{{\mathrm{\ω}}_{1}x}+C_3{e}^{{\mathrm{i\ω}}_{2}x}+C_4{e}^{-{\mathrm{i\ω}}_{2}x}\\ =D_1{\mathrm{ch\ω}}_{1}x+D_2{\mathrm{sh\ω}}_{1}x+D_3{\mathrm{cos\ω}}_{2}x+D_4{\mathrm{sin\ω}}_{2}x\end{array}$

(note: $\begin{array}{cc}{\mathrm{ch\ω}}_{1}x=\frac{e^{{\mathrm{\ω}}_{1}x}+e^{-{\mathrm{\ω}}_{1}x}}{2}& {\mathrm{sh\ω}}_{1}x=\frac{e^{{\mathrm{\ω}}_{1}x}-e^{-{\mathrm{\ω}}_{1}x}}{2}\end{array}$ )

In the freely-supported situation of pipe conveying fluid two ends, there is boundary condition

$w(0,t)=w(L,t)=0\frac{{\∂}^{2}w(0,t)}{\∂x^2}=\frac{{\∂}^{2}w(L,t)}{\∂x^2}=0$

(second be becauseSimply supported end moment M is zero. )

Can obtain thus

D₁+D₃＝0

D₁chω₁L+D₂shω₁L+D₃cosω₂L+D₄sinω₂L＝0

$D_1{\mathrm{\ω}}_1^2-D_3{\mathrm{\ω}}_2^2=0$

$D_1{\mathrm{\ω}}_1^2{\mathrm{ch\ω}}_{1}L+D_2{\mathrm{\ω}}_1^2{\mathrm{sh\ω}}_{1}L-D_3{\mathrm{\ω}}_2^2{\mathrm{cos\ω}}_{2}L-D_4{\mathrm{\ω}}_2^2{\mathrm{sin\ω}}_{2}L=0$

Solve

D₁＝0D₂＝0D₃＝0D₄≠0

And there is sin ω₂L＝0

Therefore there is ω_2,iL＝iπi＝1,2,3,...

By W=D₄sinω_2,iX is updated to the first formula, has

${\mathrm{EI\ω}}_{2,i}^4{D}_4{\mathrm{sin\ω}}_{2,i}x-({\mathrm{MV}}^2+{\mathrm{\Π}}_0){\mathrm{\ω}}_{2,i}^2{D}_4{\mathrm{sin\ω}}_{2,i}x-{\mathrm{\Ω}}^2(M+m)D_4{\mathrm{sin\ω}}_{2,i}x=0$

Thus

${\mathrm{EI\ω}}_{2,i}^4-({\mathrm{MV}}^2+{\mathrm{\Π}}_0){\mathrm{\ω}}_{2,i}^2-{\mathrm{\Ω}}^2(M+m)=0$

Solve

${\mathrm{\Ω}}_i=\sqrt{\frac{{\mathrm{EI\ω}}_{2,i}^4-({\mathrm{MV}}^2+{\mathrm{\Π}}_0){\mathrm{\ω}}_{2,i}^2}{M+m}}=\frac{i\mathrm{\π}}{L^2}\sqrt{\frac{i^2{\mathrm{\π}}^{2}EI-L^2({\mathrm{MV}}^2+{\mathrm{\Π}}_0)}{(M+m)}}$

Ω_iRepresent i rank intrinsic frequency.

(4), from experimental result, pipe conveying fluid synchronous vibration energy is mainly distributed in second order intrinsic frequency,Therefore,, according to formula (1), want to make pipe conveying fluid to reach resonance state, the relation of driving frequency and resonant frequencyFor:

$f_{in}=\frac{1}{2}{\mathrm{\Ω}}_2=\frac{\mathrm{\π}}{L^2}\sqrt{\frac{4{\mathrm{\π}}^{2}EI-L^2({\mathrm{MV}}^2+{\mathrm{\Π}}_0)}{(M+m)}}---\left(4\right)$

Apparatus of the present invention are optimized pipe conveying fluid high frequency vibration characteristic by Based Intelligent Control, and then realize descaling and antiscaling effectThe optimization of fruit, adapts to scale removal and antiscale under various on-the-spot running environment and condition of water quality, and is installed as existingField wound form, does not invade pipe interior, and peak power is 0.3KW, and maximum adaptation caliber is 0.5 meter, thisThe bright shortcoming that overcomes power coil class descaling and antiscaling device shortage theoretical direction, has greatly improved scale removal and has preventedDirt efficiency, can meet the descaling and antiscaling demand of large and medium-sized industrial enterprise.

Operation and the course of work of concrete descaling and antiscaling are as follows:

Step 1: pay before user uses at equipment, first by the professional and technical personnel of manufacturer according to the on-the-spot pipeline of userFeature, determine pipe conveying fluid dimensional parameters, material parameter, in-pipe flow flow parameters, in-tube fouling situationThe on-site parameters such as parameter. Then select suitable power coil wire according to piping material parameter and dimensional parametersRadius, and by coil winding of single layer on the water inlet at heat exchange position or the defeated stream straight tube of delivery port vicinity,Attention need to be away from pipeline crooked position, and coil turn is generally advisable between 60-100 circle. By coil two endsBe connected with two outputs of intelligent and high-efficiency mangneto vibration descaling and antiscaling device.

Step 2: the control panel of this device comprise LCDs, power power-supply module, keyboard input module,Starting switch, reset switch, mode of operation change-over switch 14, output current adjusting knob 15, power power-supplyStarting switch 16, output voltage adjusting knob 17, power power-supply output display liquid crystal display 18, as shown in Figure 2.Open starting switch, mode of operation change-over switch is switched to and determines frequency pattern is set, then will be in step 1To on-site parameters input in system by keyboard input module and LED display module, single-chip microcomputer main controlSingle-chip microcomputer control program in plate can be according to input parameter, and through type (1), formula (2) and formula (3) are automaticCalculate and can make the exciting signal frequency of pipe conveying fluid vibration in resonance state.

Step 3: obtaining after best exciting signal frequency, opening power power-supply starting switch, and adjusting successivelyJoint output current adjusting knob and output voltage adjusting knob, make the power of power coil maintain suitable modelIn enclosing. The dimensional parameters of the power adjusting Main Basis pipe conveying fluid of power coil, in the time that pipe conveying fluid radius is larger,Power coil should be operated under higher-wattage, when pipe conveying fluid radius hour, power coil should be operated in lowerUnder power. Now, apparatus of the present invention start steady operation. The alternating electromagnetic field that power coil produces mainly dividesCloth is in the tube wall of pipe conveying fluid, and as shown in Figure 3, number in the figure 19 represents defeated stream to its magnetic line of force distribution schematic diagramTube wall, number in the figure 20 represent the magnetic line of force that power coil produces. The electromagnetic field of the inner alternation of tube wall can be inducedFerromagnetic material pipe conveying fluid wall generation magnetostriction vibration effect, under electromagnetic excitation the vibration schematic diagram of pipe conveying fluid asShown in Fig. 4.

When the incrustation scale adhering to when pipe conveying fluid inside and dirt are more, under the effect of apparatus of the present invention, dirt meetingA large amount of one-tenth pieces come off, and for the dirty piece that prevents from coming off stops up pipe conveying fluid 22, sedimentation knot should be set on pipe conveying fluidStructure, with the pipe conveying fluid line structure schematic diagram of sedimentation 21 as shown in Figure 5.

The groundwork mechanism of apparatus of the present invention is the mangneto dither effect of ferrimagnet pipe conveying fluid, andUnder the effect of this device, pipe conveying fluid can be operated in resonance state, thereby under the certain prerequisite of power output,Pipe conveying fluid can reach the strongest dither effect. Prove defeated stream under the effect of this device by specific embodiment belowThe Vibration Condition of pipe.

Embodiment 1: pipe conveying fluid length is 1 meter, diameter is 0.06 meter, pipe thickness is 4 millimeters, powerWinding wire thickness is 2 millimeters, and the number of turn is 70 circles, and power power-supply power output is made as fixed value 120W.First obtain the free running frequency characteristic of pipe conveying fluid when without electromagnetic excitation, the free vibration frequency spectrum of pipe conveying fluidAs shown in Figure 6, as can see from Figure 6, the intrinsic frequency of pipe conveying fluid is divided into 1 rank intrinsic frequency 72.7Hz to figureWith 2 rank intrinsic frequency 531.3Hz, wherein second order intrinsic frequency is principal oscillation intrinsic frequency. Can by formula (1)Know, want to allow pipe conveying fluid vibrate in resonance state, the driving frequency of power coil should be 265.65Hz. RespectivelyThe driving frequency of power coil is set to 405Hz and 265Hz, observes pipe conveying fluid under these two frequenciesVibration rate. Because the monolithic counter using in this device can exist error at work unavoidably, thereforeThe actual frequency of output with frequency be set have a little error, through repeatedly measuring and average, error rangeShould be ± 3Hz. Be under the electromagnetic field effect of 405Hz and 265Hz in driving frequency, pipe conveying fluid vibration frequencySpectrum as shown in Figure 7, Figure 8. As shown in Figure 7, when driving frequency is 405Hz, pipe conveying fluid vibration frequency is817.2Hz, the speed of vibration is 33.124 μ m/s, and as shown in Figure 8, when driving frequency is 265Hz,Pipe conveying fluid vibration frequency is 537.5Hz, and vibration rate, up to 161.95 μ m/s, comparatively approaches and is operated inResonance state. Therefore, in this embodiment, intelligent and high-efficiency mangneto vibration descaling and antiscaling device of the present invention canEffectively make pipe conveying fluid vibrate in resonance state, ensured raising and the optimization of descaling and antiscaling efficiency.

Above-described embodiment is described the preferred embodiment of the present invention, not to thisBright scope limits, and designs under the prerequisite of spirit those of ordinary skill in the art not departing from the present inventionVarious distortion and improvement that technical scheme of the present invention is made, all should fall into the claims in the present invention book and determineProtection domain in.

Claims (4)

1. the mangneto of a magnetic conduction pipe conveying fluid vibration descaling and antiscaling device, is characterized in that: described device comprisesSingle-chip microcomputer master board, LED display control module, LCDs, power amplifier driver module, power amplificationModule, power coil, alarm module, power power-supply module, coil power Real-Time Monitoring module, keyboard are defeatedEnter module, mode of operation adjustment module, starting switch and reset switch; Wherein, coil power is supervised in real timeSurveying module, keyboard input module, mode of operation adjustment module inputs with the signal of single-chip microcomputer master board respectivelyEnd connect by wire harness, the signal output part of single-chip microcomputer master board respectively with LED display control module, meritPut driver module, alarm module connection, LED display control module is connected with LCDs, and power amplifier drivesModule is connected with power amplifier module, and the power take-off of power amplifier module connects power coil, and power is putThe input of large module is connected with power power-supply module; Starting switch and reset switch respectively with single-chip microcomputer master controlMaking sheet is connected to the device control that starts, resets.

2. the mangneto of a kind of magnetic conduction pipe conveying fluid according to claim 1 vibration descaling and antiscaling device, its spyLevy and be: described power coil can be single group coil, also can form by organizing coils from parallel connection of coils more.

3. the mangneto of a kind of magnetic conduction pipe conveying fluid according to claim 1 vibration descaling and antiscaling device, its spyLevy and be: described device can be used in conjunction with sedimentation system.

4. the excitation of the vibration of the mangneto based on magnetic conduction pipe conveying fluid described in a claim 1 descaling and antiscaling device frequentlyRate computational methods, is characterized in that, power coil is wrapped on ferromagnetism pipe conveying fluid outer wall, and power coil producesRaw dither, the mechanism of dither is magnetostriction vibration, the descaling and antiscaling effect of ferromagnetism pipe conveying fluidRelevant to the alternation exciting signal frequency in power coil, the method step that obtains optimal excitation signal frequency asUnder:

(1) according to magnetostriction principle, the alternating electromagnetism field action that ferromagnetism pipe conveying fluid produces at power coilThere is dither in lower meeting, its vibration frequency and exciting signal frequency are linear, and relational expression is:

f_out＝2f_in(1)

In formula (1), f_outFor pipe conveying fluid vibration frequency, f_inFor exciting signal frequency;

(2), in the time that pipe conveying fluid vibration frequency equals self intrinsic frequency, it is maximum that the oscillation intensity of pipe conveying fluid reaches,Realize resonance; The vibration equation of defeated stream straight tube is:

$EI\frac{{\∂}^4{w}_i}{\∂x^4}+({\mathrm{MV}}^2+{\mathrm{\Π}}_0)\frac{{\∂}^2{w}_i}{\∂x^2}+(M+m)\frac{{\∂}^2{w}_i}{\∂t^2}=0,(i=1,2)---\left(2\right)$

In formula (2), EI represents the bending stiffness of pipe conveying fluid; The quality of fluid under M representation unit length; VRepresent the flow velocity of tube fluid under stability state; The quality of pipe conveying fluid under m representation unit length; w₁And w₂Represent respectively the amount of deflection of two end faces of pipe; X represents when taking pipe conveying fluid axis left end during as the origin of coordinates, on axisThe distance of certain point and initial point; T represents the time; Π₀Represent the mobile stable state axial force producing of tube fluid, whenWhen pipe conveying fluid is straight tube, this parameter values is 0;

(3) according to the front 3 rank intrinsic frequencies of formula (2) acquisition pipe conveying fluid self, derive and calculate pipe conveying fluidIntrinsic frequency expression formula is:

${\mathrm{\Ω}}_i=\frac{i\mathrm{\π}}{L^2}\sqrt{\frac{i^2{\mathrm{\π}}^{2}EI-L^2({\mathrm{MV}}^2+{\mathrm{\Π}}_0)}{(M+m)}},(i=1,2,3)---\left(3\right)$

In formula (3), Ω_iFor the i rank intrinsic frequency of pipe conveying fluid, L is pipe conveying fluid length;

(4) pipe conveying fluid synchronous vibration energy is mainly distributed in second order intrinsic frequency, according to formula (1), for makingPipe conveying fluid reaches resonance state, and the pass of driving frequency and resonant frequency is:

$f_{in}=\frac{1}{2}{\mathrm{\Ω}}_2=\frac{\mathrm{\π}}{L^2}\sqrt{\frac{4{\mathrm{\π}}^{2}EI-L^2({\mathrm{MV}}^2+{\mathrm{\Π}}_0)}{(M+m)}}---\left(4\right).$