CN106018215A - Double-exciting solenoid type abrasion particle online detecting method with filter - Google Patents

Abstract

The invention relates to a double-exciting solenoid type abrasion particle online detecting method with a filter. The pressure/flow pulsation of hydraulic oil is attenuated through a filter, and the full-band hydraulic system pressure pulsation filter is adopted. Ferromagnetic particles are separated from non-ferromagnetic particles through the technologies of mechanical centrifugation, magnetizing adsorption, electrifying adsorption and the like, and the situation that a detecting result is influenced by interference between the two kinds of particles is prevented. The particle diameters are increased and the morphologies of the particles are changed through particle polymerization and rotating magnetic field shaping so that the sensitivity of detection can be improved. The structure of a solenoid coil is improved and the homogeneity of the magnetic induction intensity in a solenoid in the axis direction of the solenoid is adjusted to reduce the detection error. Two exciting coils are oppositely connected in series, magnetic fields at the positions of induction coils located in the centers of the two exciting coils cancel each other out, a zero magnetic field is formed, it is guaranteed that a very large magnetic flux change rate can be acquired when the magnetic flux changes slightly, the detection sensitivity is improved, and requirements of follow-up signals for treatment circuits are lowered.

Description

A kind of double excitation solenoid type wear particle online test method using wave filter

[technical field]

The present invention relates to a kind of hydraulic oil wear particle detecting system, be specifically related to a kind of double excitation solenoid type wear particle online test method using wave filter, belong to technical field of hydraulic equipment.

[background technology]

Abrasion is one of principal element of component of machine inefficacy, and wear particle is the most directly information word of monitoring wear process and diagnosis wear out failure type.Statistics both domestic and external show, hydraulic machinery 70% fault is derived from the particle contamination of fluid.Therefore, the metallic wear particles in fluid is carried out on-line monitoring and has become one of important channel reducing abrasion and hydraulic system clamping jam faults.

Inductance type transducer belongs to non-contact measurement, and in fluid, material and the quantity of contained metallic wear particles make sensor equivalent inductance change, thus realize the on-line monitoring of wear particle.Chinese invention patent the 201310228772.6th discloses a kind of fluid metal worn particle on-line monitoring system, and this fluid metal worn particle on-line monitoring system includes sensor, microprocessor and circuit, and its sensor is solenoid type inductance sensor.When using this system to carry out on-line monitoring, first the excitation coil parallel connection of two identical sensors accessing excitation AC signal generator, the big resistance by two induction coil differential concatenations and with the resistances such as two is connected into AC bridge；Then make the oil circuit of a fluid sensor from which passes through.When the oil circuit containing excitation coil and induction coil in sensor, by the fluid containing metal worn particle, another is obstructed out-of-date, and metal worn particle affects the magnetic field intensity of sensor, destroys the balance of electric bridge, the alternating voltage of induction coil output respective magnitudes.Output voltage size and metal worn particle concentration are directly proportional, and the metal worn particle concentration contained in fluid is the biggest, and output voltage values is the biggest.By system processing module to output signal collection and process, reach the purpose to fluid metal worn particle concentration on-line monitoring.

But, there is the deficiency of following several respects in above-mentioned monitoring method:

1. the magnetic fluctuation that metallic wear particles causes when flowing through test coil is the faintest, and the output result of detection coil is affected relatively big by microgranule Negotiation speed, and in pipeline, pressure and the flowed fluctuation of fluid will have a strong impact on effectiveness and the concordance of inductance method detection of particulates.

2. the galling abrasive particle in machine oil can be divided into ferromagnetics microgranule (such as ferrum) and non-ferromagnetic material microgranule (such as copper, aluminum) according to its electromagnetic property.Ferromagnetics microgranule strengthens the equivalent inductance of cell winding, and non-ferromagnetic material microgranule then weakens the equivalent inductance of cell winding.When two kinds of microgranules are simultaneously by detection coil, this monitoring device will lose efficacy.

The particle diameter of metallic wear particles is less the most under normal circumstances, at about 5um, and predominantly ball milling grain, its fiber number is less than other abrasive particles, and cell winding is relatively weak to its power of test.As patent documentation 1 can only process the metal particle of about 10um, it is impossible to the premature wear of monitoring parts.

4. the magnetic induction density B in solenoid is non-uniform Distribution along its axis direction, and this will cause serious measurement error；The inductance of the most same model is greater than the power of test to copper granule to the power of test of Ferrous particles, and this can bring measurement error equally.

Therefore, for solving above-mentioned technical problem, the double excitation solenoid type wear particle online test method using wave filter of a kind of innovation of necessary offer, to overcome described defect of the prior art.

[summary of the invention]

For solving above-mentioned technical problem, it is an object of the invention to provide and a kind of use that non-contacting metering system, signal conformance are good, reliability is high, detection signal is strong and error the is little double excitation solenoid type wear particle online test method using wave filter.

For achieving the above object, the technical scheme that the present invention takes is: a kind of double excitation solenoid type wear particle online test method using wave filter, it uses a kind of detecting system, this system is arranged on fluid pressure line, including wave filter, separates adsorption module, rotates moulding module, excitation coil I, excitation coil II, induction coil and ECU；Wherein, described wave filter, separate adsorption module, rotate moulding module, excitation coil I, induction coil, excitation coil II are successively set on fluid pressure line；Described excitation coil I and excitation coil II differential concatenation；Described induction coil central authorities between excitation coil I and excitation coil II；Described ECU is electrically connected with and controls wave filter, separates adsorption module, rotates moulding module, excitation coil I, excitation coil II and induction coil；Described wave filter includes input pipe, shell, outlet tube, elastic thin-wall, plug-in type H mode filter and plug-in type cascaded H mode filter；Described input pipe is connected to one end of shell, and it extends in shell；Described outlet tube is connected to the other end of shell, and it extends in shell；Described elastic thin-wall is installed in shell along the radial direction of shell；Described input pipe, outlet tube and elastic thin-wall are collectively forming a two-tube slip-on filter；Resonance series cavity volume I, resonance series cavity volume II and parallel resonance cavity volume is formed between described elastic thin-wall and shell；Separated by an elastic baffle between described resonance series cavity volume I and resonance series cavity volume II；Some conical damping holes are uniformly had in the axial direction of described elastic thin-wall；Described elastic baffle is provided with taper near input tube side and inserts pipe, and pipe connection resonance series cavity volume I and resonance series cavity volume II is inserted in described taper；Described plug-in type H mode filter is positioned at parallel resonance cavity volume, and it is connected with conical damping hole；Described plug-in type cascaded H mode filter is positioned at resonance series cavity volume I and resonance series cavity volume II, and it is also connected with conical damping hole；Described plug-in type H mode filter and plug-in type cascaded H mode filter are axially symmetrical set, and form plug-in type connection in series-parallel H mode filter；Described separation adsorption module is made up of the mechanical centrifugal module being sequentially connected with, magnetized module, magnetic suck module, electrification module and electric adsorption module；It comprises the steps:

1), the fluid in fluid pressure line passes through wave filter, the fluctuation pressure of the high, medium and low frequency range in filter attenuation hydraulic system, and suppression flowed fluctuation；

2), fluid enters the mechanical centrifugal module separating adsorption module afterwards, makes the wear particle in fluid be polymerized and realize initial centrifugation, and the polymeric macroparticle making quality bigger gets rid of to near-wall；

3), make ferromagnetic metal polymeric macroparticle force-magnetized by magnetized module；

4), the magnetic suck module absorption big microgranule of magnetized metal polymerization；

5), fluid passes through electric ignitor, makes the non-ferromagnetic metal wear particle charged polymeric in fluid；

6), fluid flows into electric adsorption module, electric adsorption module absorption non-ferromagnetic metal wear particle；

7), ECU first controls electric adsorption module by direction of an electric field the most reversely, then cancels electric field, makes non-ferromagnetic metal wear particle enter and rotates moulding module, recovers electric field afterwards；Meanwhile, ECU controls magnetic suck module and the power-off of electrification module, and ferromagnetic particle enters and rotates moulding module；Subsequently, magnetic suck module and the electrification original duty of module recovery；

8), charged nonferromagnetic microgranule and magnetized ferromagnetic particle successively enter and rotate moulding module, make the particle diameter of in fluid two kinds of metal particles increase form simultaneously and become elongated acicular texture so that the fiber number of metal particle is also greatly increased；

9), produce magnetic field in opposite direction by excitation coil I and excitation coil II, be positioned at magnetic field at the induction coil of both central authorities and cancel out each other；Two based fine particles enter induction coil in batches, cause induction coil to produce induction electromotive force, thus judge type and the quantity of wear particle.

The double excitation solenoid type wear particle online test method using wave filter of the present invention is further: the axis of described input pipe and outlet tube is the most on the same axis；The described wider place of conical damping hole opening is positioned at resonance series cavity volume I and parallel resonance cavity volume, and its taper angle is 10 °；Described taper is inserted the wider place of tube opening and is positioned at resonance series cavity volume II, and its taper angle is 10 °；The inner side of described elastic thin-wall is provided with colloid damping layer；The internal layer of described colloid damping layer and outer layer are respectively outer layer elastic thin-wall and internal layer elastic thin-wall, are connected by some pillars are fixing between outer layer elastic thin-wall and internal layer elastic thin-wall；It is filled with, in interlayer between described outer layer elastic thin-wall and internal layer elastic thin-wall, the pure water adding antifreezing agent, in pure water, is suspended with Bio-sil；Described colloid damping layer is connected with shell near one end of outlet tube；Described colloid damping layer is provided with a piston near one end of outlet tube.

The double excitation solenoid type wear particle online test method using wave filter of the present invention is further: described mechanical centrifugal module uses eddy flow to be centrifuged module；Described eddy flow is centrifuged module and includes eddy flow tube wall, the first flow deflector, the second flow deflector, motor and flow transducer；Wherein, described first flow deflector is provided with 3, and these 3 first flow deflectors are uniformly distributed along tube wall inner periphery every 120 °, and its laying angle is set to 18 °；Described second flow deflector and the first flow deflector structure are identical, after it is arranged on the first flow deflector, and and the first flow deflector stagger 60 ° and be connected in tube wall, its laying angle is set to 36 DEG C；The long limit of described first flow deflector is connected with tube wall, and minor face extends along the axis of tube wall；Its leading edge frustrates into obtuse, and trailing edge is processed into wing, and its height is 0.4 times of tube wall diameter, 1.8 times of a length of tube wall diameter；Described motor connects and drives the first flow deflector and the second flow deflector, to regulate laying angle；Described flow transducer is arranged on the central authorities in tube wall.

The double excitation solenoid type wear particle online test method using wave filter of the present invention is further: described magnetized module includes aluminum matter pipeline, some windings, iron shell and flange；Wherein, described some windings are rotating around outside aluminum matter pipeline；Described iron shell is coated on aluminum matter pipeline；Described flange welding is at the two ends of aluminum matter pipeline.

The double excitation solenoid type wear particle online test method using wave filter of the present invention is further: described magnetic suck module uses homopolarity adjacent type absorbing ring, and this homopolarity adjacent type absorbing ring includes aluminium ring shape pipeline, forward solenoid, reverse solenoid and irony magnetic conduction cap；Described forward solenoid and reverse solenoid are respectively arranged in aluminium ring shape pipeline, and both are connected with electric current in opposite direction so that forward solenoid and reverse solenoid adjacent produce like pole；Described irony magnetic conduction cap is arranged on the inwall of aluminium ring shape pipeline, and it is positioned at forward solenoid and reverse solenoid adjacent and forward solenoid and the intermediate point of reverse solenoid axis.

The double excitation solenoid type wear particle online test method using wave filter of the present invention is further: described magnetic suck module uses the homopolarity adjacent type absorbing ring of charged hammer, and the homopolarity adjacent type absorbing ring of this charged hammer includes aluminium ring shape pipeline, forward solenoid, reverse solenoid, irony magnetic conduction cap, dividing plate, electric shock hammer and electric magnet；Described forward solenoid and reverse solenoid are respectively arranged in aluminium ring shape pipeline, and both are connected with electric current in opposite direction so that forward solenoid and reverse solenoid adjacent produce like pole；Described irony magnetic conduction cap is arranged on the inwall of aluminium ring shape pipeline, and it is positioned at forward solenoid and reverse solenoid adjacent and forward solenoid and the intermediate point of reverse solenoid axis；Described dividing plate is between forward solenoid and reverse solenoid；Described electric shock hammer and electric magnet are between dividing plate；Described electric magnet connects and can promote electric shock hammer, makes electric shock hammer tap aluminium ring shape inner-walls of duct.

The double excitation solenoid type wear particle online test method using wave filter of the present invention is further: described electrification module includes some electrodes and an electrode controller；Described some electrodes are installed on fluid pressure line, and it is respectively connecting to electrode controller.

The double excitation solenoid type wear particle online test method using wave filter of the present invention is further: described electric adsorption module includes aluminum matter pipeline, positive plate, minus plate and pole plate controller；Wherein, described positive plate, minus plate are separately positioned on aluminum matter pipeline, and in being oppositely arranged；Described positive plate, minus plate are respectively and electrically connected on pole plate controller；Described pole plate controller is electrically connected to ECU, and by ECU control.

The double excitation solenoid type wear particle online test method using wave filter of the present invention is further: the moulding module of described rotation includes aluminum matter pipeline, some windings, iron shell, flange and the moulding current output module of some rotations；Wherein, described some windings are rotating around outside aluminum matter pipeline；Described iron shell is coated on aluminum matter pipeline；Described flange welding is at the two ends of aluminum matter pipeline；The moulding current output module of each rotation is connected to a winding.

The double excitation solenoid type wear particle online test method using wave filter of the present invention is also: described excitation coil I and excitation coil II all comprises some windings, each winding is made up of positive winding and inverse winding, each winding is respectively connecting to an exciting current output module, and this exciting current output module is by ECU control.

Compared with prior art, there is advantages that and present invention introduces oil liquid pressure flowed fluctuation suppression technology and microgranule timesharing release measure, to ensure effectiveness and the concordance of detection；By mechanical centrifugal, magnetization absorption, play the technology such as electro-adsorption by ferromagnetics microgranule and non-ferromagnetic material separation of particles, affect testing result preventing two kinds of microgranules from interfering with each other；By aggregation of particles and rotating excitation field moulding increase grain diameter and change its form, to improve the sensitivity of detection；By improving the uniformity along its axis direction of the magnetic induction in solenoid coil structural adjustment solenoid, to reduce detection error；Construct zero magnetic field, the outside field coil differential concatenation (double excitation solenoid) that two are driven by high-frequency ac power, the magnetic direction produced is contrary, can make to be placed exactly in magnetic field at central sensory coil at tube interior to cancel out each other, it is zero magnetic field, ensure to obtain the biggest variation rate of magnetic flux when magnetic flux change is less, to improve detection sensitivity, reduce follow-up signal and process circuit requirement.

[accompanying drawing explanation]

Fig. 1 is the overall structure schematic diagram of the double excitation solenoid type wear particle on-line detecting system using wave filter of the present invention.

Fig. 2 is the structural representation of the wave filter in Fig. 1.

Fig. 3 is the profile in Fig. 2 along A-A.

Fig. 4 is plug-in type H mode filter schematic diagram in Fig. 3.

Fig. 5 is plug-in type cascaded H mode filter schematic diagram in Fig. 3.

Fig. 6 is plug-in type H mode filter and plug-in type cascaded H mode filter frequency characteristic constitutional diagram.Wherein, solid line is plug-in type cascaded H mode filter frequency characteristic.

Fig. 7 is plug-in type connection in series-parallel H mode filter frequency characteristic figure.

Fig. 8 is the structural representation of Double-pipe plug-in type wave filter.

Fig. 9 is the cross sectional representation of elastic thin-wall.

Figure 10 is the Longitudinal cross section schematic of colloid damping layer.

Figure 11 is the connection diagram separating adsorption module in Fig. 1.

Figure 12-1 is the horizontal schematic diagram of the mechanical centrifugal module in Figure 11.

Figure 12-2 is the radial direction schematic diagram of the mechanical centrifugal module in Figure 11.

Figure 13 is the structural representation of the magnetized module in Figure 11.

Figure 14-1 be the magnetic suck module in Figure 11 be the structural representation of homopolarity adjacent type absorbing ring.

Figure 14-2 is the structural representation of the adjacent type absorbing ring of the homopolarity that magnetic suck module is charged hammer in Figure 11.

Figure 15 is the structural representation of the electrification module in Figure 11.

Figure 16 is the structural representation of the electric adsorption module in Figure 11.

Figure 17 is the structural representation rotating moulding module in Fig. 1.

Figure 18-1 is the structural representation of the winding of the detection coil in Fig. 1.

Figure 18-2 is the circuit diagram of the exciting current output module in Figure 18-1.

Figure 19 is the annexation figure of the ECU in Fig. 1.

[detailed description of the invention]

Refer to shown in Figure of description 1 to accompanying drawing 19, the present invention is a kind of double excitation solenoid type wear particle on-line detecting system using wave filter, it is arranged on fluid pressure line 7, its by wave filter 8, separate adsorption module 2, rotate several parts such as moulding module 3, excitation coil I4, induction coil 5, excitation coil II6 and ECU1 and form.

Wherein, described wave filter 8, separate adsorption module 2, rotate moulding module 3, excitation coil I4, induction coil 5, excitation coil II6 are successively set on fluid pressure line 7.Described ECU1 is electrically connected with and controls wave filter 8, separation adsorption module 2, rotates moulding module 3, excitation coil I4, excitation coil II5 and induction coil 5.

Owing to the flow velocity of fluid is very big on detection characteristic impact, along with the increase of oil flow, the sensitivity of detection and output voltage all will occur significant change；Meanwhile, the flow of fluid also has large effect, when flow increases to detection output, output voltage is as well as change, this is very big, to this end, the present invention adds wave filter 8 stable hydraulic system pressure and flow before detection to concordance and the availability influence of testing result.

Described wave filter 8 is made up of several parts such as input pipe 81, shell 89, outlet tube 811, elastic thin-wall 87, plug-in type H mode filter 812 and plug-in type cascaded H mode filters 813.

Wherein, described input pipe 81 is connected to one end of shell 89, is used for inputting fluid；Described outlet tube 811 is connected to the other end of shell 89, and itself and separation adsorption module 2 dock.Described elastic thin-wall 87 is installed in shell 89 along the radial direction of shell.The axis of described input pipe 81 and outlet tube 811 the most on the same axis, so can improve the filter effect of more than 10%.

Described input pipe 81, outlet tube 811 and elastic thin-wall 87 are collectively forming a two-tube slip-on filter, thus hydraulic system high frequency pressure pulsations of decaying.The filter transmission coefficient obtained after processing by lumped-parameter method is:

$\mathrm{\γ}=\frac{{\left|Z\right|}^2}{{\left|Z\right|}^2+{\left(\frac{2\mathrm{\ρ}a}{{\mathrm{\πd}}_1^2}\right)}^2}$

Velocity of sound ρ fluid density d in a medium₁Input pipe diameter Z characteristic impedance

$Z=\frac{1}{\frac{1}{Z_1}+\frac{1}{Z_2}+\frac{1}{Z_3}}$

$Z_1=\frac{{\mathrm{\ρl}}_{1}s}{\frac{\mathrm{\π}}{4}(D^2-{d_1}^2)}+\frac{{\mathrm{\ρa}}^2}{\frac{\mathrm{\π}}{4}(D^2-{d_1}^2)l_{1}s}$

$Z_2=\frac{\mathrm{\ρ}Ls}{\frac{\mathrm{\π}}{4}{D}^2}+\frac{{\mathrm{\ρa}}^2}{\frac{\mathrm{\π}}{4}{D}^{2}Ls}$

$Z_3=\frac{{\mathrm{\ρl}}_{2}s}{\frac{\mathrm{\π}}{4}(D^2-{d_2}^2)}+\frac{{\mathrm{\ρa}}^2}{\frac{\mathrm{\π}}{4}(D^2-{d_2}^2)l_{2}s}$

d₂Outlet tube diameter D cavity volume diameter l₁Input inserts length of tube l₂Outfan inserts length of tube L cavity volume total length and the difference of input outfan insertion length of tube sum.

From above formula, Double-pipe plug-in type cavity volume wave filter is similar with the electric capacity effect in circuit.When the pressure pulse wave of different frequency is by this wave filter, transmission coefficient is different with frequency.Frequency is the highest, then transmission coefficient is the least, and this shows that the pressure pulse wave of high frequency is decayed the most severe when device after filtering, thus serves the effect eliminating high frequency pressure pulsations.

The design principle of described Double-pipe plug-in type wave filter is as follows: when in pipeline, the fluctuating frequency of pressure is higher, and pressure oscillation acts on convection cell on fluid and produces pinch effect.When the flow of change enters Double-pipe plug-in type cavity volume by input pipe, liquid stream exceedes average discharge, and the cavity volume of expansion can absorb unnecessary liquid stream, and releases liquid stream when less than average discharge, thus absorption pressure pulsation energy.

Described elastic thin-wall 87 weakens hydraulic system medium-high frequency pressure fluctuation by being forced to mechanical vibration.The elastic thin-wall natural frequency obtained after processing by lumped-parameter method is:

$f_m=\frac{k^{2}h}{2{\mathrm{\πR}}^2}\·\sqrt{\frac{E}{12\mathrm{\ρ}(1+\mathrm{\η})(1-{\mathrm{\μ}}^2)}}$

K elastic thin-walled structures coefficient h elastic thin-wall thickness R elastic thin-wall radius

The mass density of the Young's modulus ρ elastic thin-wall of E elastic thin-wall

The Poisson's ratio of the current-carrying factor mu elastic thin-wall of η elastic thin-wall.

Substitute into actual parameter, above formula is carried out simulation analysis it is found that the natural frequency of elastic thin-wall 87 is generally high than the natural frequency of H mode filter, and its attenuation band is also wide than H mode filter.In relatively wide frequency band range, elastic thin-wall has good attenuating to pressure fluctuation.Meanwhile, the elastic thin-wall radius in the filter construction of the present invention is bigger and relatively thin, and its natural frequency, closer to Mid Frequency, can realize the effective attenuation to the medium-high frequency pressure fluctuation in hydraulic system.

The design principle of described elastic thin-wall 87 is as follows: when producing intermediate frequency pressure fluctuation in pipeline, Double-pipe plug-in type cavity volume wave filter is more weak to the damping capacity of pressure oscillation, flow into the periodically pulsing pressure continuous action of Double-pipe plug-in type cavity volume on the inside and outside wall of elastic thin-wall, owing to having between inside and outside wall, pillar is fixing to be connected, inside and outside elastic thin-wall does periodic vibration by the frequency of fluctuation pressure simultaneously, this forced vibration consumes the pressure fluctuation energy of fluid, thus realizes the filtering of Mid Frequency pressure.From the principle of virtual work, the ability that elastic thin-wall consumes fluid pulsation pressure energy is directly related with potential energy during its forced vibration and kinetic energy sum, in order to improve Mid Frequency filtering performance, the radial design of elastic thin-wall is much larger than pipe radius, and the thickness of thin-walled is less, representative value is less than 0.1mm.

Further, resonance series cavity volume I84, resonance series cavity volume II83 and parallel resonance cavity volume 85 is formed between described elastic thin-wall 87 and shell 89, described cavity volume 83,84,85 is across whole wave filter, it is hereby achieved that bigger resonance cavity volume volume, strengthens attenuating.Separated by an elastic baffle 810 between described resonance series cavity volume I84 and resonance series cavity volume II5.Uniformly having some conical damping holes 86 in the axial direction of described elastic thin-wall 87, the wider place of described conical damping hole 86 opening is positioned at resonance series cavity volume I84 and parallel resonance cavity volume 85, and its taper angle is 10 °.Described elastic baffle 810 is provided with taper and inserts pipe 82 near input pipe 81 side, and described taper is inserted pipe 82 and connected resonance series cavity volume I84 and resonance series cavity volume II83.Described taper is inserted the wider place of pipe 82 opening and is positioned at resonance series cavity volume II83, and its taper angle is 10 °.

Described plug-in type H mode filter 812 is positioned at parallel resonance cavity volume 85, and it is connected with conical damping hole 86.The wave filter natural angular frequency obtained after processing by lumped-parameter method is:

$\begin{array}{cc}{\mathrm{\ω}}_r=a\sqrt{\frac{S}{L(V-LS)}}& (rad/s)\end{array}---\left(1\right)$

Velocity of sound L damping hole long S damping hole cross-sectional area V parallel resonance cavity volume volume in a medium.

Described plug-in type cascaded H mode filter 813 is positioned at resonance series cavity volume I84 and resonance series cavity volume II83, and it is also connected with conical damping hole 86.After processing by lumped-parameter method, two natural angular frequencies of wave filter are:

${\mathrm{\ω}}_1=\frac{\sqrt{\mathrm{\π}}a}{\sqrt{2}\sqrt{k_1+k_2+\sqrt{{\[k_1-k_2\]}^2+\frac{4{(V_4-\frac{1}{4}{{\mathrm{\πd}}_3}^2{l}_3)}^2{l}_1{l}_3}{d_1^2{d}_3^2}}}}---\left(2\right)$

${\mathrm{\ω}}_2=\frac{\sqrt{\mathrm{\π}}a}{\sqrt{2}\sqrt{k_1+k_2-\sqrt{{\[k_1-k_2\]}^2+\frac{4{(V_4-\frac{1}{4}{{\mathrm{\πd}}_3}^2{l}_3)}^2{l}_1{l}_3}{d_1^2{d}_3^2}}}}---\left(3\right)$

Wherein:

$k_1=\frac{l_1(V_2+V_4-\frac{1}{4}{{\mathrm{\πd}}_1}^2{l}_1-\frac{1}{4}{{\mathrm{\πd}}_3}^2{l}_3)}{{d_1}^2}$

$k_2=\frac{(V_4-\frac{1}{4}{{\mathrm{\πd}}_3}^2{l}_3)l_3}{{d_3}^2}$

Velocity of sound l in a medium₁The long d of damping hole₁Damping hole diameter l₃Insert pipe range

d₃Insert pipe diameter V₂Resonance series cavity volume 1 volume V₄Resonance series cavity volume 2 volume.

Described plug-in type H mode filter 812 and plug-in type cascaded H mode filter 813 are axially symmetrical set, and form plug-in type connection in series-parallel H mode filter, for broadening frequency filtering scope and make overall structure more compact.This creates the circumferentially multiple plug-in type connection in series-parallel H mode filters (only depicting 2 in figure) of interface distributions, separates with dividing plate 820 each other.

All can be found by Fig. 6 plug-in type H mode filter and plug-in type cascaded H mode filter frequency characteristic and formula (1) (2) (3), plug-in type cascaded H mode filter has 2 natural angular frequencies, at crest, filter effect is preferable, does not the most substantially have filter effect at trough；Plug-in type H mode filter has 1 natural angular frequency, and at crest, filter effect is preferable equally, does not the most substantially have filter effect at trough；Select suitable filter parameter, the natural angular frequency making plug-in type H mode filter just falls between 2 natural angular frequencies of plug-in type cascaded H mode filter, as shown in Figure 7, both in certain frequency range, defined the natural reonant frequency peak value of 3 next-door neighbours, in this frequency range, no matter the fluctuating frequency of pressure is at crest or all can guarantee that preferable filter effect at trough.The bank of filters that multiple plug-in type connection in series-parallel H mode filters are constituted both can cover whole medium and low frequency section, it is achieved the entire spectrum filtering of medium and low frequency section.

The inner side of described elastic thin-wall 87 is provided with colloid damping layer 88.The internal layer of described colloid damping layer 88 and outer layer are respectively outer layer elastic thin-wall 81 and internal layer elastic thin-wall 82, are connected by some pillars 814 are fixing between outer layer elastic thin-wall 81 and internal layer elastic thin-wall 82.It is filled with the pure water 816 adding antifreezing agent in interlayer between outer layer elastic thin-wall 81 and internal layer elastic thin-wall 82, in pure water 816, is suspended with Bio-sil 815.Described colloid damping layer 88 is connected with shell 89 near one end of outlet tube 811；Described colloid damping layer 88 is additionally provided with a piston 817 near one end of outlet tube 811.

Due to outer layer elastic thin-wall 81 with internal layer elastic thin-wall 82 spacing is the least and is connected by pillar 814 is fixing, when pressure fluctuation acts perpendicularly to thin-walled, inside and outside wall produces and is close to consistent deformation, and colloid damping layer thickness is kept approximately constant, and pressure fluctuation is not had damping action；The flow pulsation in 817 sensation level directions of piston of colloid damping layer 88, when flow pulsation strengthens, piston 817 pressurized makes colloid damping layer shrink, and squeezing action makes the water in colloid damping layer 88 be entered micron order central void by nanoscale transfer passage；When flow pulsation weakens, piston 817 is by back-pressure, and now colloid damping layer expands, and the water in colloid damping layer is discharged through passage from central void.In the process, mechanics effect, the roughness effect of channel surface molecular scale and chemistry heterogeneous body effect due to silica gel 815 microchannel sorption, piston follows the interfactial work that colloid damping layer shrinks and does " gas-liquid-solid " border in expansion process, thus flow systolic implementation is decayed, its substantially parallel R mode filter.This wave filter is relative to the advantage of general liquid condenser: it is decayed flow pulsation by the way of the interfactial work on " gas-liquid-solid " border, a large amount of mechanical energy can be absorbed in the case of not producing heat, and energy expenditure does not relies on piston speed, extinction efficiency is obviously improved.

The present invention can also the pulsation decay of solid line operating mode self-adaptive pressure.When hydraulic system working conditions change, both executive component stopped suddenly or ran, and when the opening of valve changes, the characteristic impedance of pipe-line system can be caused to undergo mutation, so that former pipeline pressure curve with change in location in time changes the most therewith, then the position of pressure peak also changes.Owing to the axial length of the wave filter of the present invention is designed as more than system main pressure pulsation wavelength, and cavity volume length, the length of Double-pipe plug-in type cavity volume wave filter and the length of elastic thin-wall of the plug-in type connection in series-parallel H mode filter group of wave filter and wave filter axial length equal, it is ensured that pressure peak position is constantly in the effective range of wave filter；And the conical damping hole of plug-in type connection in series-parallel H mode filter is opened on elastic thin-wall, it is uniformly distributed in the axial direction so that the performance of wave filter is had little to no effect by pressure peak change in location, it is achieved thereby that operating mode adaptive-filtering function.Suitable in view of three kinds of filter structure axial dimensions and wave filter, this bigger size also ensure that hydraulic filter possesses stronger pressure fluctuation damping capacity.

The method that the pressure fluctuation restraining device using the present invention carries out hydraulic pulsation filtering is as follows:

1), hydraulic fluid enters Double-pipe plug-in type wave filter by input pipe, and the cavity volume of expansion absorbs unnecessary liquid stream, completes the filtering of high frequency pressure pulsations；

2), by elastic thin-wall 87 forced vibration, consume the pressure fluctuation energy of fluid, complete the filtering of intermediate frequency pressure fluctuation；

3), by plug-in type connection in series-parallel H mode filter group, insert pipe by conical damping hole, taper and fluid produces resonance, consume pulsation energy, complete the filtering of low frequency pulsation；

4), the axial length of wave filter is designed as more than hydraulic system main pressure pulsation wavelength, and plug-in type connection in series-parallel H mode filter length, Double-pipe plug-in type filter length and elastic thin-wall 87 length are equal with filter length, pressure peak position is made to be constantly in the effective range of wave filter, it is achieved the filtering of pressure fluctuation when system condition changes.

Galling abrasive particle in machine oil can be divided into ferromagnetics microgranule (such as ferrum) and non-ferromagnetic material microgranule (such as copper, aluminum) according to its electromagnetic property.Ferromagnetics microgranule strengthens the equivalent inductance of cell winding, and non-ferromagnetic material microgranule then weakens the equivalent inductance of cell winding.When two kinds of microgranules are simultaneously by detection coil, this monitoring device will lose efficacy.To this end, the present invention separates adsorption module 2 separates both microgranules.Described separation adsorption module 2 is made up of the mechanical centrifugal module 21 being sequentially connected with, magnetized module 22, magnetic suck module 23, electrification module 24 and electric adsorption module 25.

Wherein, described mechanical centrifugal module 21 makes fluid under the action of the centrifugal, the solid particle that quality is bigger is thrown toward cavity wall, it uses the mode of energy loss, its design principle is as follows: arrange the flow deflector of the distortion of certain altitude and length in the duct, and make blade face tangent line angled with axis, fluid can be made to produce spiral flow in pipes because pipe flow border changes, this spiral flow can be analyzed to the circumferential flow around pipe axle and axial straight flowing, and the particulate matter carried in fluid produces off-axis alignment heart screw.This eddy flow centrifugal device 21 is made up of several parts such as eddy flow tube wall the 211, first flow deflector the 212, second flow deflector 213, motor 214 and flow transducers 215, and described motor 214 and flow transducer 215 are electrically connected to ECU1.

Wherein, described first flow deflector 212 is provided with 3, these 3 first flow deflectors 212 are uniformly distributed along tube wall 211 inner periphery every 120 °, and its laying angle (angle between the first flow deflector 212 and eddy flow tube wall 211) is set to 18 °, to ensure optimal tangential flowing.Described second flow deflector 213 is identical with the first flow deflector 212 structure, after it is arranged on the first flow deflector 212, and and the first flow deflector 212 stagger 60 ° and be connected in tube wall 211, its laying angle is set to 36 DEG C, for reducing resistance and strengthening the intensity of circumferential flow.It addition, the 3rd or more flow deflector can be arranged the most again according to actual separation effect, laying angle gradually increases.Described motor 214 connects and drives the first flow deflector 212 and the second flow deflector 213, to regulate laying angle, thus can obtain more preferable centrifugal effect, knows and makes flow deflector 212,213 adapt to different operating modes.Described flow transducer 215 is arranged on the central authorities in tube wall 211, the ECU1 numerical analysis cyclonic separation effect by reading flow quantity sensor 215, and controlling motor 214 accordingly, motor 214 regulates the laying angle of each flow deflector 212,213, to obtain more separating effect.

Further, the long limit of described first flow deflector 212 is connected with tube wall 211, and minor face 213 extends along the axis of tube wall 211；For reducing resistance, its leading edge frustrates into obtuse；For avoiding streaming, trailing edge is processed into wing；Its height is 0.4 times of tube wall 211 diameter, makes the spiral flow of formation have bigger intensity；1.8 times of a length of tube wall 211 diameter, to ensure the bigger sphere of action to fluid.

Described magnetized module 22 is force-magnetized by the ferromagnetic metal wear particle that carries in fluid, and makes micron-sized wear particle aggregate into bulky grain, can improve the output signal strength of sensor.Described magnetizing assembly 22 is made up of aluminum matter pipeline 221, some windings 222, iron shell 223 and flange 224.Wherein, described aluminum matter pipeline 221 makes fluid flow there through and by magnetization treatment, and the pcrmeability of aluminum is the lowest, can make to obtain in pipeline 221 higher magnetic field intensity.

Described some windings 222, rotating around outside aluminum matter pipeline 221, are coated insullac by the copper wire of a diameter of about 1.0mm and make.Described iron shell 223 is coated on aluminum matter pipeline 221, and the material of irony can mask most magnetic flux.Described flange 224 is welded on the two ends of aluminum matter pipeline 221.

Described magnetic suck module 23 is polymerized big microgranule for adsorpting aggregation in the magnetization of near-wall, and it can use homopolarity adjacent type absorbing ring.This homopolarity adjacent type absorbing ring is made up of parts such as aluminium ring shape pipeline 231, forward solenoid 232, reverse solenoid 233 and irony magnetic conduction caps 234.Wherein, described forward solenoid 232 and reverse solenoid 233 are respectively arranged in aluminium ring shape pipeline 231 and by ECU1 control, and both are connected with electric current in opposite direction so that forward solenoid 232 and reverse solenoid 233 adjacent produce like pole.Described irony magnetic conduction cap 234 is arranged on the inwall of aluminium ring shape pipeline 231, and it is positioned at forward solenoid 232 and reverse solenoid 233 adjacent and forward solenoid 232 and the intermediate point of reverse solenoid 233 axis.

The design principle of described homopolarity adjacent type absorbing ring is as follows: energising forward solenoid 232, reverse solenoid 233, adjacent forward solenoid 232, reverse solenoid 233 are connected with electric current in opposite direction so that forward solenoid 232, reverse solenoid 233 adjacent produce like pole；Meanwhile, aluminium ring shape pipeline 231 can improve magnetic circuit, strengthens the magnetic field intensity at inner-walls of duct, strengthens the irony magnetic conduction cap 234 capture absorbability to granule.Each forward solenoid 232, reverse solenoid 233 electric current are directly controlled by ECU1, can be different with concentration and change, to obtain optimal adsorption performance according to the size of granule.

Further, the homopolarity adjacent type absorbing ring that described magnetic suck module 23 may be used without charged hammer, the homopolarity adjacent type absorbing ring of this charged hammer is made up of parts such as aluminium ring shape pipeline 231, forward solenoid 232, reverse solenoid 233, irony magnetic conduction cap 234, dividing plate 235, electric shock hammer 236 and electric magnet 237.Wherein, described forward solenoid 232 and reverse solenoid 233 are respectively arranged in aluminium ring shape pipeline 231 and by ECU1 control, and both are connected with electric current in opposite direction so that forward solenoid 232 and reverse solenoid 233 adjacent produce like pole.Described irony magnetic conduction cap 234 is arranged on the inwall of aluminium ring shape pipeline 231, and it is positioned at forward solenoid 232 and reverse solenoid 233 adjacent and forward solenoid 232 and the intermediate point of reverse solenoid 233 axis.Described electric shock hammer 236 and electric magnet 237 are between dividing plate 235.Described electric magnet 237 connects and can promote electric shock hammer 236, makes electric shock hammer 236 percussion aluminium ring shape pipeline 232 inwall.Described ECU1 is electrically connected with and controls forward solenoid 232, reverse solenoid 233 and electric magnet 237.

The design principle of the homopolarity adjacent type absorbing ring of described charged hammer is as follows: energising forward solenoid 232, reverse solenoid 233, adjacent forward solenoid 232, reverse solenoid 233 are connected with electric current in opposite direction so that forward solenoid 232, reverse solenoid 233 adjacent produce like pole；Meanwhile, aluminium ring shape pipeline 231 can improve magnetic circuit, strengthens the magnetic field intensity at inner-walls of duct, strengthens the irony magnetic conduction cap 234 capture absorbability to granule.Each forward solenoid 232, reverse solenoid 233 electric current are directly controlled by ECU1, can be different with concentration and change, to obtain optimal adsorption performance according to the size of granule.And by the setting of electric shock hammer 236, prevent granule bulk deposition at irony magnetic conduction cap 234, affect adsorption effect.Now, the inwall of electric shock hammer 236 percussion pipeline 231 is controlled by electric magnet 237 so that adsorbed granule scatter to both sides.Meanwhile, when cleaning pipeline 231, the percussion of electric shock hammer 236 can also improve cleaning performance.

After described magnetic suck module 23 has been adsorbed, ECU1 controls electric magnet power-off, and paramagnetism aluminum matter pipeline loses magnetism, and is attached to magnetic polymeric bulky grain on inner-walls of duct and will be disengaged from tube wall and enter electrification module 24 with fluid along tube wall with low speed.

Described electrification module 24 makes the non-ferromagnetic metal wear particle in hydraulic oil charged, and it is made up of some electrodes 241 and an electrode controller 242.Described some electrodes 241 are installed on fluid pressure line 7, and it is respectively connecting to electrode controller 242.Described electrode controller 242 is electrically connected with and applies voltage to electrode 241, makes the particulate matter in fluid charged.

Non-ferromagnetic metal wear particle in fluid is adsorbed on tube wall by described electric adsorption module 25, and it is made up of aluminum matter pipeline 251, positive plate 252, minus plate 253 and pole plate controller 254.Wherein, described positive plate 252, minus plate 253 are separately positioned on aluminum matter pipeline 251, and in being oppositely arranged；Described positive plate 252, minus plate 253 are respectively and electrically connected on pole plate controller 254；Described pole plate controller 254 is electrically connected to ECU1, and by ECU1 control.

The operation principle of described electric adsorption module 25 is as follows: charged non-ferromagnetic material metallic wear particles flows into electric adsorption module 25 with speed V along tube wall with fluid, two electrodes of the negative and positive of electric adsorption module 25 525,253 are controlled to produce the uniform electric field vertical with speed V direction by pole plate controller 254, then charged corpuscle in electric field is centrifuged module by being perpendicular to the acting on of electric field force of velocity attitude, making charged particle do parabolic motion to pole plate under this force, charged corpuscle adsorbs other microgranule along the direction of motion and forms polymeric macroparticle.This parabolic motion specifically refers to charged corpuscle and moves along a straight line axially following fluid, radially then do at the uniform velocity or variable motion under electric field force effect, change electric field intensity by pole plate controller 254 and can change movement velocity, make charged polymeric bulky grain be adsorbed onto on tube wall.After having adsorbed, when ECU1 controlling plate controller 254 power-off, it is attached to magnetic polymeric bulky grain on inner-walls of duct and will be disengaged from tube wall and enter rotation moulding module 3 with fluid along tube wall with low speed.

The moulding module of described rotation 3 is for improving the sensitivity of detection.Research shows: the inductance rate of change of cell winding is directly proportional to the cube of abrasive particle radius.Meanwhile, the form of magnetizing mediums more trends towards elongate, and its demagnetizing factor is the least, and the intensity of magnetization is the biggest, and magnetizing field field intensity is the biggest.Change on sensor equivalent inductance affects the biggest.The moulding module of this rotation 3 is made up of several parts such as aluminum matter pipeline 31, some windings 32, iron shell 33, flange 34 and the moulding current output module of some rotations 35.Wherein, described some windings 32 are rotating around outside aluminum matter pipeline 31；Described iron shell 33 is coated on aluminum matter pipeline 31；Described flange 34 is welded on the two ends of aluminum matter pipeline 31；The moulding current output module of each rotation 35 is connected to a winding 32.

The design principle of the moulding module of described rotation 3 is as follows: polymeric macroparticle enters with fluid after rotating moulding module 3, ECU1 controls to rotate moulding current output module 35, making to flow through three-phase symmetrical electric current in the moulding current output module of rotation 35, this electric current produces rotating excitation field in aluminum matter pipeline 31.Magnetized particles is acted on by magnetic field force under rotating excitation field effect, and the most spirally advance, magnetic microparticles defines a lot of acicular texture along magnetic line of force direction, these acicular textures will be followed magnetic field and be spinned motion when magnetic field rotating, specifically move along a straight line axially following fluid, radially then follow rotating excitation field and spin motion.Adjust three-phase symmetrical electric current and can change speed and the track of screw.When the metal particle in the acicular texture and movement locus of motion meets with, it is combined with one another to bulky grain polymer.By rotating moulding module 3, make the particle diameter of the metal particle in fluid increase form simultaneously and become elongated acicular texture so that the fiber number of metal particle is also greatly increased, and further enhancing the sensitivity of Double-coil type detection.

Metallic wear particles is non-uniform Distribution in oil circuit, and variations in flow patterns is sufficiently complex, and when particle size and material change, its changes of magnetic field caused is the faintest, if detection Magnetic field inhomogeneity will cause serious measurement error, makes detection sensitivity reduce；Requiring that the characteristic of excitation coil I and excitation coil II is completely the same, this is usually extremely difficult to simultaneously, needs the excitation coil I and excitation coil II of design to have the function of on-line automatic regulation for this.Specifically, described excitation coil I4 and excitation coil II6 all comprises some windings, and each winding is made up of positive winding 41 and inverse winding 42, and each winding is respectively connecting to an exciting current output module 43.This exciting current output module 43 is by ECU1 control, and its digital potentiometer used is AD5206, has the output of 6 passages, can and ECU1 between realize single bus data transmission.ECU1 realizes the current settings of polylith exciting current output module 73 to magnetization winding and output by monobus.Amplifier AD8601 and metal-oxide-semiconductor 2N7002 achieve high-precision voltage follow by negative feedback and export.Constant High-current output have employed amplifier OPA 549 of the high voltage of Texas Instrument (TI), big electric current.

The operation principle of described detection coil 7 is as follows: in order to produce the magnetic field in same polarity direction and to make up the magnetic field that breach causes unbalanced simultaneously, positive winding 41 is identical with the current characteristics in inverse winding 42, the axis direction of conduit under fluid pressure 7 is arranged with multipair forward and reverse winding, electric current is controlled, it is possible to form the uniform magnetic field of system requirements by different exciting current output modules 43.

Because the abrasive particle in liquid is the least, the impact on former magnetic field is the least, and the flux change amount i.e. produced is the least, the sensitivity high in order to ensure sensor, needs to obtain big induction electromotive force in induction coil.According to Faraday law of electromagnetic induction, the size of induced electromotive force and being directly proportional by the rate of change of the magnetic flux of conductor circuit, its direction depends on direction and the situation of change in magnetic field.When magnetic flux change is less, big to make its rate of change, its approach has two kinds: one to be the number of turn increasing primary coil, but sensor bulk so can be caused excessive, inadvisable；One be former magnetic field magnetic flux be zero, be i.e. in zero magnetic field.Based on this, three groups of coils of the employing of the sensor of this design.Excitation coil I4 and excitation coil II6 is driven by high-frequency ac power, two coil differential concatenations, the magnetic direction of generation is contrary, and the central authorities that described induction coil 5 is between excitation coil I4 and excitation coil II6, magnetic field at induction coil 5 can be made to cancel out each other, be zero magnetic field.Induction coil 5 connects with ECU.When in fluid by there being metal bulky grain, cause disturbance of magnetic field, cause induction coil 5 to produce induction electromotive force, utilize ferromagnetics and the non-ferromagnetic material metal particle otherwise impact to former magnetic field, cause phase of output signal contrary, wear particle type in fluid can be distinguished；Magnetic media grain is the biggest, and fiber number is the biggest, and the biggest on magnetic field impact, the amplitude of output signal is the biggest, and the sensitivity of detection is the highest.

The concrete grammar using above-mentioned supervising device to be monitored hydraulic oil is as follows:

1), the fluid in fluid pressure line 7 passes through wave filter 8, and wave filter 8 is decayed the fluctuation pressure of the high, medium and low frequency range in hydraulic system, and suppression flowed fluctuation；

2), fluid enters the mechanical centrifugal module 21 separating adsorption module 2 afterwards, makes the wear particle in fluid be polymerized and realize initial centrifugation, and the polymeric macroparticle making quality bigger gets rid of to near-wall；

3), make ferromagnetic metal polymeric macroparticle force-magnetized by magnetized module 22；

4), magnetic suck module 23 adsorbs the big microgranule of magnetized metal polymerization；

5), by electrification module 24, the non-ferromagnetic metal wear particle charged polymeric in fluid is made；

6), charged particle flows into electric adsorption module 25 with speed v subsequently, electric adsorption module 25 is controlled to produce the uniform magnetic field vertical with speed v direction by ECU1, charged particle in segregation apparatus by being perpendicular to the acting on of Loulun magnetism of velocity attitude and magnetic direction, make charged particle under this force to aluminum matter vessel wall motion, so that the non-ferromagnetic metal wear particle in fluid " separates " out from fluid, absorption is on tube wall.

7), after magnetic suck and electro-adsorption to enough particle concentrations, ECU1 first controls electric adsorption module 25 by direction of an electric field the most reversely, cancel electric field again, then adsorbing non-ferromagnetic metal wear particle on tube wall to start to depart from tube wall slowly enter the moulding module 3 of rotation from static, electric adsorption module 25 the most then recovers original electric field.Meanwhile, ECU1 controls magnetic suck module 23 power-off, and paramagnetism aluminum matter pipeline loses magnetism, it is attached to magnetic polymeric bulky grain on inner-walls of duct and will be disengaged from tube wall, the power-off of electrification module 24, ferromagnetic particle flows through electrification module 24 and electric adsorption module 25 with low speed with fluid, enters and rotates moulding module 3.Subsequently, magnetic suck module and the electrification original duty of module recovery.

8), charged nonferromagnetic microgranule and magnetized ferromagnetic particle successively enter and rotate moulding module 3, and now ECU1 flows through three-phase symmetrical electric current in controlling three-phase symmetric winding, and this electric current produces rotating excitation field in aluminum matter pipeline.Magnetized particles is acted on by magnetic field force under rotating excitation field effect, and the most spirally advance, magnetic microparticles defines a lot of acicular texture along magnetic line of force direction, these acicular textures will be followed magnetic field and be spinned motion when magnetic field rotating, when the metal particle in the acicular texture and movement locus of motion meets with, it is combined with one another to bulky grain polymer.

9), by rotating moulding module 3, make the particle diameter of the metal particle in fluid increase form simultaneously and become elongated acicular texture so that the fiber number of metal particle is also greatly increased, and further enhancing the sensitivity of Double-coil type detection.This two based fine particles enters excitation coil I4 with the state of low speed, high concentration, bulky grain and big fiber number in batches subsequently, ECU1 controls the magnetic field homogeneity that exciting current keeps excitation coil I4, simultaneously because the inductance of same model is greater than the power of test to copper granule to the power of test of Ferrous particles, need ECU1 regulation exciting current to compensate this difference, with keep output concordance.

10), excitation coil I4 and excitation coil II6 is driven by high-frequency ac power, two coil differential concatenations, the magnetic direction produced is contrary, it is positioned at magnetic field at the induction coil 5 of both central authorities to cancel out each other, when in fluid by there being metal bulky grain, cause disturbance of magnetic field, cause induction coil 5 to produce significant induction electromotive force.Utilize ferromagnetics and the non-ferromagnetic material metal particle otherwise impact to former magnetic field, cause phase of output signal contrary, wear particle type in fluid can be distinguished, and the power of induction electromotive force may determine that the quantity of abraded metal particle, thus realize that signal conformance is good, reliability is high, the detection contactless detection of particulates that signal is strong and error is little.

Above detailed description of the invention is only the preferred embodiment of this creation, and not in order to limit this creation, all any modification, equivalent substitution and improvement etc. done within this spirit created and principle, within should be included in the protection domain of this creation.

Claims (10)

1. the double excitation solenoid type wear particle online test method using wave filter, it is characterized in that: it uses a kind of detecting system, this system is arranged on fluid pressure line, including wave filter, separates adsorption module, rotates moulding module, excitation coil I, excitation coil II, induction coil and ECU；Wherein, described wave filter, separate adsorption module, rotate moulding module, excitation coil I, induction coil, excitation coil II are successively set on fluid pressure line；Described excitation coil I and excitation coil II differential concatenation；Described induction coil central authorities between excitation coil I and excitation coil II；Described ECU is electrically connected with and controls wave filter, separates adsorption module, rotates moulding module, excitation coil I, excitation coil II and induction coil；Described wave filter includes input pipe, shell, outlet tube, elastic thin-wall, plug-in type H mode filter and plug-in type cascaded H mode filter；Described input pipe is connected to one end of shell, and it extends in shell；Described outlet tube is connected to the other end of shell, and it extends in shell；Described elastic thin-wall is installed in shell along the radial direction of shell；Described input pipe, outlet tube and elastic thin-wall are collectively forming a two-tube slip-on filter；Resonance series cavity volume I, resonance series cavity volume II and parallel resonance cavity volume is formed between described elastic thin-wall and shell；Separated by an elastic baffle between described resonance series cavity volume I and resonance series cavity volume II；Some conical damping holes are uniformly had in the axial direction of described elastic thin-wall；Described elastic baffle is provided with taper near input tube side and inserts pipe, and pipe connection resonance series cavity volume I and resonance series cavity volume II is inserted in described taper；Described plug-in type H mode filter is positioned at parallel resonance cavity volume, and it is connected with conical damping hole；Described plug-in type cascaded H mode filter is positioned at resonance series cavity volume I and resonance series cavity volume II, and it is also connected with conical damping hole；Described plug-in type H mode filter and plug-in type cascaded H mode filter are axially symmetrical set, and form plug-in type connection in series-parallel H mode filter；Described separation adsorption module is made up of the mechanical centrifugal module being sequentially connected with, magnetized module, magnetic suck module, electrification module and electric adsorption module；It comprises the steps:

1), the fluid in fluid pressure line passes through wave filter, the fluctuation pressure of the high, medium and low frequency range in filter attenuation hydraulic system, and suppression flowed fluctuation；

2), fluid enters the mechanical centrifugal module separating adsorption module afterwards, makes the wear particle in fluid be polymerized and realize initial centrifugation, and the polymeric macroparticle making quality bigger gets rid of to near-wall；

3), make ferromagnetic metal polymeric macroparticle force-magnetized by magnetized module；

4), the magnetic suck module absorption big microgranule of magnetized metal polymerization；

5), fluid passes through electric ignitor, makes the non-ferromagnetic metal wear particle charged polymeric in fluid；

6), fluid flows into electric adsorption module, electric adsorption module absorption non-ferromagnetic metal wear particle；

7), ECU first controls electric adsorption module by direction of an electric field the most reversely, then cancels electric field, makes non-ferromagnetic metal wear particle enter and rotates moulding module, recovers electric field afterwards；Meanwhile, ECU controls magnetic suck module and the power-off of electrification module, and ferromagnetic particle enters and rotates moulding module；Subsequently, magnetic suck module and the electrification original duty of module recovery；

8), charged nonferromagnetic microgranule and magnetized ferromagnetic particle successively enter and rotate moulding module, make the particle diameter of in fluid two kinds of metal particles increase form simultaneously and become elongated acicular texture so that the fiber number of metal particle is also greatly increased；

9), produce magnetic field in opposite direction by excitation coil I and excitation coil II, be positioned at magnetic field at the induction coil of both central authorities and cancel out each other；Two based fine particles enter induction coil in batches, cause induction coil to produce induction electromotive force, thus judge type and the quantity of wear particle.

2. the double excitation solenoid type wear particle online test method using wave filter as claimed in claim 1, it is characterised in that: the axis of described input pipe and outlet tube is the most on the same axis；The described wider place of conical damping hole opening is positioned at resonance series cavity volume I and parallel resonance cavity volume, and its taper angle is 10 °；Described taper is inserted the wider place of tube opening and is positioned at resonance series cavity volume II, and its taper angle is 10 °；The inner side of described elastic thin-wall is provided with colloid damping layer；The internal layer of described colloid damping layer and outer layer are respectively outer layer elastic thin-wall and internal layer elastic thin-wall, are connected by some pillars are fixing between outer layer elastic thin-wall and internal layer elastic thin-wall；It is filled with, in interlayer between described outer layer elastic thin-wall and internal layer elastic thin-wall, the pure water adding antifreezing agent, in pure water, is suspended with Bio-sil；Described colloid damping layer is connected with shell near one end of outlet tube；Described colloid damping layer is provided with a piston near one end of outlet tube.

3. the double excitation solenoid type wear particle online test method using wave filter as claimed in claim 1, it is characterised in that: described mechanical centrifugal module uses eddy flow to be centrifuged module；Described eddy flow is centrifuged module and includes eddy flow tube wall, the first flow deflector, the second flow deflector, motor and flow transducer；Wherein, described first flow deflector is provided with 3, and these 3 first flow deflectors are uniformly distributed along tube wall inner periphery every 120 °, and its laying angle is set to 18 °；Described second flow deflector and the first flow deflector structure are identical, after it is arranged on the first flow deflector, and and the first flow deflector stagger 60 ° and be connected in tube wall, its laying angle is set to 36 DEG C；The long limit of described first flow deflector is connected with tube wall, and minor face extends along the axis of tube wall；Its leading edge frustrates into obtuse, and trailing edge is processed into wing, and its height is 0.4 times of tube wall diameter, 1.8 times of a length of tube wall diameter；Described motor connects and drives the first flow deflector and the second flow deflector, to regulate laying angle；Described flow transducer is arranged on the central authorities in tube wall.

4. the double excitation solenoid type wear particle online test method using wave filter as claimed in claim 1, it is characterised in that: described magnetized module includes aluminum matter pipeline, some windings, iron shell and flange；Wherein, described some windings are rotating around outside aluminum matter pipeline；Described iron shell is coated on aluminum matter pipeline；Described flange welding is at the two ends of aluminum matter pipeline.

5. the double excitation solenoid type wear particle online test method using wave filter as claimed in claim 1, it is characterized in that: described magnetic suck module uses homopolarity adjacent type absorbing ring, and this homopolarity adjacent type absorbing ring includes aluminium ring shape pipeline, forward solenoid, reverse solenoid and irony magnetic conduction cap；Described forward solenoid and reverse solenoid are respectively arranged in aluminium ring shape pipeline, and both are connected with electric current in opposite direction so that forward solenoid and reverse solenoid adjacent produce like pole；Described irony magnetic conduction cap is arranged on the inwall of aluminium ring shape pipeline, and it is positioned at forward solenoid and reverse solenoid adjacent and forward solenoid and the intermediate point of reverse solenoid axis.

6. the double excitation solenoid type wear particle online test method using wave filter as claimed in claim 1, it is characterized in that: described magnetic suck module uses the homopolarity adjacent type absorbing ring of charged hammer, the homopolarity adjacent type absorbing ring of this charged hammer includes aluminium ring shape pipeline, forward solenoid, reverse solenoid, irony magnetic conduction cap, dividing plate, electric shock hammer and electric magnet；Described forward solenoid and reverse solenoid are respectively arranged in aluminium ring shape pipeline, and both are connected with electric current in opposite direction so that forward solenoid and reverse solenoid adjacent produce like pole；Described irony magnetic conduction cap is arranged on the inwall of aluminium ring shape pipeline, and it is positioned at forward solenoid and reverse solenoid adjacent and forward solenoid and the intermediate point of reverse solenoid axis；Described dividing plate is between forward solenoid and reverse solenoid；Described electric shock hammer and electric magnet are between dividing plate；Described electric magnet connects and can promote electric shock hammer, makes electric shock hammer tap aluminium ring shape inner-walls of duct.

7. the double excitation solenoid type wear particle online test method using wave filter as claimed in claim 1, it is characterised in that: described electrification module includes some electrodes and an electrode controller；Described some electrodes are installed on fluid pressure line, and it is respectively connecting to electrode controller.

8. the double excitation solenoid type wear particle online test method using wave filter as claimed in claim 1, it is characterised in that: described electric adsorption module includes aluminum matter pipeline, positive plate, minus plate and pole plate controller；Wherein, described positive plate, minus plate are separately positioned on aluminum matter pipeline, and in being oppositely arranged；Described positive plate, minus plate are respectively and electrically connected on pole plate controller；Described pole plate controller is electrically connected to ECU, and by ECU control.

9. the double excitation solenoid type wear particle online test method using wave filter as claimed in claim 1, it is characterised in that: the moulding module of described rotation includes aluminum matter pipeline, some windings, iron shell, flange and the moulding current output module of some rotations；Wherein, described some windings are rotating around outside aluminum matter pipeline；Described iron shell is coated on aluminum matter pipeline；Described flange welding is at the two ends of aluminum matter pipeline；The moulding current output module of each rotation is connected to a winding.

10. the double excitation solenoid type wear particle online test method using wave filter as claimed in claim 1, it is characterized in that: described excitation coil I and excitation coil II all comprises some windings, each winding is made up of positive winding and inverse winding, each winding is respectively connecting to an exciting current output module, and this exciting current output module is by ECU control.