CN105891061A - Liquid oil monitoring device adopting full-band and variable-structure filtering, absorbing and shaping - Google Patents
Liquid oil monitoring device adopting full-band and variable-structure filtering, absorbing and shaping Download PDFInfo
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- CN105891061A CN105891061A CN201610313285.3A CN201610313285A CN105891061A CN 105891061 A CN105891061 A CN 105891061A CN 201610313285 A CN201610313285 A CN 201610313285A CN 105891061 A CN105891061 A CN 105891061A
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- 238000001914 filtration Methods 0.000 title claims abstract description 44
- 239000007788 liquid Substances 0.000 title abstract description 9
- 238000012806 monitoring device Methods 0.000 title abstract description 6
- 238000007493 shaping process Methods 0.000 title abstract 4
- 230000005291 magnetic effect Effects 0.000 claims abstract description 81
- 238000001514 detection method Methods 0.000 claims abstract description 51
- 238000010521 absorption reaction Methods 0.000 claims abstract description 34
- 230000005347 demagnetization Effects 0.000 claims abstract description 17
- 238000000926 separation method Methods 0.000 claims abstract description 13
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- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 39
- 229910052782 aluminium Inorganic materials 0.000 claims description 39
- 238000001179 sorption measurement Methods 0.000 claims description 36
- 238000012544 monitoring process Methods 0.000 claims description 34
- 239000003921 oil Substances 0.000 claims description 31
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 26
- AZDRQVAHHNSJOQ-UHFFFAOYSA-N alumane Chemical group [AlH3] AZDRQVAHHNSJOQ-UHFFFAOYSA-N 0.000 claims description 23
- 230000008859 change Effects 0.000 claims description 23
- 229910052742 iron Inorganic materials 0.000 claims description 12
- 230000008602 contraction Effects 0.000 claims description 8
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- 238000003032 molecular docking Methods 0.000 claims description 2
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C1/00—Magnetic separation
- B03C1/02—Magnetic separation acting directly on the substance being separated
- B03C1/30—Combinations with other devices, not otherwise provided for
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/72—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables
- G01N27/74—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables of fluids
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N2015/0019—Means for transferring or separating particles prior to analysis, e.g. hoppers or particle conveyors
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Abstract
The invention relates to a liquid oil monitoring device adopting full-band and variable-structure filtering, absorbing and shaping. The liquid oil monitoring device is arranged on a hydraulic pipeline, and comprises a filter, a separation and absorption module, a rotary shaping module, a detecting coil, a flow sensor and a demagnetization module which are sequentially arranged on the hydraulic pipeline; the detecting coil and a reference coil are connected in series; an electronic control unit (ECU) is respectively and electrically connected with and used for controlling the filter, the separation and absorption module, the rotary shaping module, the detecting coil, the reference coil, the demagnetization module and the flow sensor; a full-band and variable-structure filter is adopted as the filter; the separation and absorption module consists of a mechanical centrifugal module, a magnetization module, a magnetic absorption module, an electrification module and an electric absorption module which are sequentially connected. The liquid oil monitoring device adopts a non-contact measurement way, and has the advantages of being good in signal consistency, high in reliability, strong in detection signals, low in error, and the like.
Description
[technical field]
The present invention relates to a kind of fluid on-line monitoring equipment, be specifically related to a kind of use the filtering of full frequency band structure changes, absorption and moulding Oil Monitoring equipment, belong to technical field of hydraulic equipment.
[background technology]
In the failure mode of machine parts, the inefficacy that abrasion causes accounts for more than 70%.Metallic wear particles implies mechanized equipment running state information, abrasion present situation and the trend of equipment can be reflected, be also diagnostic device fault simultaneously, be predicted maintenance, equipment is improved the important evidence of design.Therefore, the metallic wear particles in fluid is carried out on-line monitoring and has become the diagnosis of hydraulic system clamping jam faults and the important means of anticipation.
Utilize coil inductance change can detect ferromagnetics granule and diamagnetism granule in fluid, can determine that the quality analysis of wear particle, distribution of sizes, total quantity simultaneously, can conveniently realize non-intruding on-line monitoring.Chinese invention patent the 201210167540.Xth discloses a kind of online oil particle sensor measured based on inductance value, when the metal wear particles in fluid flows through test coil, make to test winding inductance quantity and become big, high-frequency test circuit oscillation frequency diminishes, oscillation circuit electric current becomes big, after metal wear particles flows through, high-frequency test part comes back to original fixed ampllitude oscillatory regime, and then obtain amounts of particles, particle size distribution and granule generation speed, it is achieved granule on-line monitoring in oil.
But, there is the deficiency of following several respects in this 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, employing full frequency band structure changes filtering, absorption and the moulding Oil Monitoring equipment 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 is little uses the filtering of full frequency band structure changes, absorption and moulding Oil Monitoring equipment.
For achieving the above object, the technical scheme that the present invention takes is: a kind of use the filtering of full frequency band structure changes, absorption and moulding Oil Monitoring equipment, it is arranged on fluid pressure line, and it includes wave filter, separates adsorption module, rotates moulding module, detection coil, reference coil, demagnetization module, flow transducer and ECU；Wherein, described wave filter, separate adsorption module, rotate moulding module, detection coil, flow transducer, demagnetization module are successively set on fluid pressure line；Described detection coil, reference coil are in series；Described ECU is electrically connected with and controls wave filter, separates adsorption module, rotates moulding module, detection coil, reference coil, demagnetization module and flow transducer；Described wave filter includes input pipe, shell, outlet tube, S type elastic thin-wall, H mode filter and cascaded H mode filter；Wherein, described input pipe is connected to one end of shell, itself and hydraulic oil inlet docking；Described outlet tube is connected to the other end of shell, and itself and U-shaped separation of particles module are docked；Described S type elastic thin-wall is installed in shell along the radial direction of shell, forms expansion chamber and contraction chamber in it；Described input pipe, outlet tube and S type elastic thin-wall are collectively forming a S type cavity volume wave filter；Some taper structure changes damping holes are uniformly had in the axial direction of described S type elastic thin-wall；Described taper structure changes damping hole is made up of cone shaped elastic damping hole pipe and slot apertures；Resonance series cavity volume I and parallel resonance cavity volume is formed between described S type elastic thin-wall and shell；The outside of described resonance series cavity volume I sets a resonance series cavity volume II, inserts pipe by a taper and connect between described resonance series cavity volume I and resonance series cavity volume II；Described H mode filter is positioned at parallel resonance cavity volume, and it is connected with taper structure changes damping hole；Described cascaded H mode filter is positioned at resonance series cavity volume I and resonance series cavity volume II, and it is also connected with taper structure changes damping hole；Described H mode filter and cascaded H mode filter are axially symmetrical set, and form 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.
The use filtering of full frequency band structure changes, absorption and the moulding Oil Monitoring equipment of the present invention are further arranged to: the axis of described input pipe and outlet tube is the most on the same axis；The wider place of described taper structure changes damping hole opening is positioned at resonance series cavity volume I and parallel resonance cavity volume, and its taper angle is 10 °；The Young's modulus of described taper structure changes damping hole cone shaped elastic damping hole pipe is bigger than the Young's modulus of elastic thin-wall, can be with change in fluid pressure stretching or compression；The Young's modulus of slot apertures is bigger than the Young's modulus of cone shaped elastic damping hole pipe, can be with fluid opened by pressure or closedown；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 use filtering of full frequency band structure changes, absorption and the moulding Oil Monitoring equipment of the present invention are further arranged to: 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 use filtering of full frequency band structure changes, absorption and the moulding Oil Monitoring equipment of the present invention are further arranged to: 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 use filtering of full frequency band structure changes, absorption and the moulding Oil Monitoring equipment of the present invention are further arranged to: 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 use filtering of full frequency band structure changes, absorption and the moulding Oil Monitoring equipment of the present invention are further arranged to: 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 use filtering of full frequency band structure changes, absorption and the moulding Oil Monitoring equipment of the present invention are further arranged to: 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 use filtering of full frequency band structure changes, absorption and the moulding Oil Monitoring equipment of the present invention are further arranged to: 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 use filtering of full frequency band structure changes, absorption and the moulding Oil Monitoring equipment of the present invention are further arranged to: 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 use filtering of full frequency band structure changes, absorption and the moulding Oil Monitoring equipment of the present invention are also configured to: the winding of described detection coil is made up of positive winding and inverse winding, each winding is connected to an exciting current output module, and this exciting current output module is controlled by ECU module.
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；Sensor design is two loop construction detection line coil and a reference coil, is output as both differences, to overcome the circuit error of zero.
[accompanying drawing explanation]
Fig. 1 is employing full frequency band structure changes filtering, absorption and the overall structure schematic diagram of moulding Oil Monitoring equipment 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 H mode filter schematic diagram in Fig. 3.
Fig. 5 is cascaded H mode filter schematic diagram in Fig. 3.
Fig. 6 is H mode filter and cascaded H mode filter frequency characteristic constitutional diagram.Wherein, solid line is cascaded H mode filter frequency characteristic.
Fig. 7 is connection in series-parallel H mode filter frequency characteristic figure.
Fig. 8 is the structural representation of S type cavity volume wave filter.
Fig. 9 is the cross sectional representation of S type elastic thin-wall.
Figure 10 is the schematic diagram of taper structure changes damping hole in Fig. 2.
Figure 10 (a) to Figure 10 (c) is the working state figure of taper structure changes damping hole.
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 module 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 to use the filtering of full frequency band structure changes, absorption and moulding Oil Monitoring equipment, it is arranged on fluid pressure line 9, its by wave filter 8, separate adsorption module 2, rotate moulding module 3, detection several parts such as coil 4, reference coil 5, demagnetization module 6, flow transducer 7 and ECU1 form.
Wherein, described wave filter 8, separate adsorption module 2, rotate moulding module 3, detection coil 4, flow transducer 7, demagnetization module 6 are successively set on fluid pressure line 9.Described ECU1 is electrically connected with and controls wave filter 8, separation adsorption module 2, rotates moulding module 3, detection coil 4, reference coil 5, demagnetization module 6 and flow transducer 7.
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 88, outlet tube 89, S type elastic thin-wall 87, H mode filter 812 and 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 S type elastic thin-wall 87 is installed in shell 88 along the radial direction of shell, forms expansion chamber 71 and contraction chamber 72 in it.The axis of described input pipe 81 and outlet tube 89 the most on the same axis, so can improve the filter effect of more than 10%.
Described input pipe 81, outlet tube 89 and S type elastic thin-wall 87 are collectively forming a S type cavity volume wave filter, thus hydraulic system high frequency pressure pulsations of decaying.The filter transmission coefficient obtained after processing by lumped-parameter method is:
Velocity of sound L contraction chamber length D expansion chamber diameter Z characteristic impedance in a medium
γ transmission coefficient f pressure oscillation frequency dIInput pipe diameter d contraction chamber diameter
k1Expansion chamber coefficient k2Contraction chamber coefficient
From above formula, S 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.Meanwhile, in the S type holding cavity structure of the present invention, transitions smooth between expansion chamber and contraction chamber, contribute to reducing the system pressure loss that cavity diameter sudden change brings.The input pipe of wave filter and outlet tube the most on the same axis, can improve the filter effect of more than 10%.
The design principle of described S type cavity volume wave filter is as follows: when the flow of change passes through the expansion chamber that input pipe enters S type cavity volume, liquid stream exceedes average discharge, the expansion chamber expanded can absorb unnecessary liquid stream, and releases liquid stream when less than average discharge, thus absorption pressure pulsation energy.The combination of multiple expansion chamber and contraction chamber then improves the fluctuation pressure absorbability of wave filter, namely filtering performance.Use curved surface to smoothly transit between expansion chamber and contraction chamber, then avoid and lost along stroke pressure and heating by what fluid boundary sudden change brought.
Described S type elastic thin-wall 87 weakens hydraulic system medium-high frequency pressure fluctuation by being forced to mechanical vibration.The S type elastic thin-wall natural frequency obtained after processing by lumped-parameter method is:
K S type elastic thin-walled structures coefficient h S type elastic thin-wall thickness R S type elastic thin-wall radius
The mass density of the Young's modulus ρ S type elastic thin-wall of E S type elastic thin-wall
The Poisson's ratio of the current-carrying factor mu S type elastic thin-wall of η S type elastic thin-wall.
Substitute into actual parameter, above formula is carried out simulation analysis it is found that the natural frequency of S type 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, S type elastic thin-wall has good attenuating to pressure fluctuation.Meanwhile, the S type 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 S type elastic thin-wall 87 is as follows: when producing intermediate frequency pressure fluctuation in pipeline, S type cavity volume is more weak to the damping capacity of pressure oscillation, flow into the periodically pulsing pressure continuous action of wave filter S type cavity volume on the inside and outside wall of S type elastic thin-wall 87, 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 and parallel resonance cavity volume 85 are formed between described S type elastic thin-wall 87 and shell 88.The outside of described resonance series cavity volume I84 sets a resonance series cavity volume II83, insert pipe 82 by a taper between described resonance series cavity volume I84 and resonance series cavity volume II83 to connect, 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 °.Some taper structure changes damping holes 86 are uniformly had in the axial direction of described S type elastic thin-wall 87.
Described H mode filter 812 is positioned at parallel resonance cavity volume 85, and it is connected with taper structure changes damping hole 86.The wider place of described taper structure changes damping hole 86 opening is positioned at resonance series cavity volume I84 and parallel resonance cavity volume 85, and its taper angle is 10 °.The wave filter natural angular frequency obtained after processing by lumped-parameter method is:
Velocity of sound L in a medium1The long D of damping hole1Damping hole diameter
L2Parallel resonance cavity volume height D2Parallel resonance cavity volume diameter.
Described 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 taper structure changes damping hole 86.After processing by lumped-parameter method, two natural angular frequencies of cascaded H mode filter 813 are:
Velocity of sound l in a medium1The long d of damping hole1Damping hole diameter l3Resonance pipe range
d3Resonantron diameter l2Resonance series cavity volume 1 height d2Resonance series cavity volume 1 diameter
l4Resonance series cavity volume 2 height d4Resonance series cavity volume 2 diameter.
Described H mode filter 812 and cascaded H mode filter 813 are axially symmetrical set, and form connection in series-parallel H mode filter, for broadening frequency filtering scope and make overall structure more compact.The present invention circumferentially interface distributions multiple connection in series-parallel H mode filters (only depicting 2 in figure), separate with dividing plate 820 each other, the resonance bands of these multiple wave filter is different, whole medium and low frequency filtering frequency range can be covered, it is achieved the entire spectrum filtering of medium and low frequency section after combining comprehensively.
All can be found by Fig. 6 H mode filter and cascaded H mode filter frequency characteristic and formula, cascaded H mode filter has 2 natural angular frequencies, and at crest, filter effect is preferable, does not the most substantially have filter effect at trough；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 H mode filter just falls between 2 natural angular frequencies of 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 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.
Further, described taper structure changes damping hole 86 is made up of cone shaped elastic damping hole pipe 16 and slot apertures 15, and taper narrow end is opened on elastic thin-wall 7.Wherein the Young's modulus of cone shaped elastic damping hole pipe 16 is bigger than the Young's modulus of elastic thin-wall 7, can be with change in fluid pressure stretching or compression；The Young's modulus of slot apertures 15 is bigger than the Young's modulus of cone shaped elastic damping hole pipe 16, can be with fluid opened by pressure or closedown.Therefore when the fluctuating frequency of pressure falls at high band, c-type cavity volume filter construction strobes, cone shaped elastic damping hole pipe 16 and slot apertures 15 are all in Figure 10 (a) state；And when ripple frequency falls at Mid Frequency, filter construction becomes c-type cavity volume filter construction and elastic thin-wall 7 filter structure concurs, cone shaped elastic damping hole pipe 16 and slot apertures 15 are all in Figure 10 (a) state；When ripple frequency falls at some specific Frequency, filter construction becomes plug-in type connection in series-parallel H mode filter, c-type cavity volume filter construction and elastic thin-wall filter structure and concurs, cone shaped elastic damping hole pipe 16 and slot apertures 15 are all in Figure 10 (b) state, owing to the natural frequency of plug-in type connection in series-parallel H mode filter is designed to consistent with these particular low frequency ripple frequencies, the system that fundamental frequency energy is big can be played preferable filter effect；When ripple frequency falls the low-frequency range beyond some characteristic frequency, cone shaped elastic damping hole pipe 16 and slot apertures 15 are all in Figure 10 (c) state.The design of such structure changes wave filter both ensure that the full frequency band full working scope filtering of hydraulic system, reduces again the pressure loss of wave filter under nominal situation, it is ensured that the hydraulic pressure rigidity of system.
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 the cavity volume length of connection in series-parallel H mode filter group of wave filter, the length of S type cavity volume wave filter and the length of elastic thin-wall and wave filter axial length equal, it is ensured that pressure peak position is constantly in the effective range of wave filter；And the taper structure changes damping hole of 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 hydraulic filter using the present invention carries out hydraulic pulsation filtering is as follows:
1), hydraulic fluid enters S type cavity volume 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 S type elastic thin-wall 87 forced vibration, consume the pressure fluctuation energy of fluid, complete the filtering of intermediate frequency pressure fluctuation；
3), by connection in series-parallel H mode filter group, and taper structure changes damping hole, taper insertion pipe and fluid produce resonance, consume energy of pulsing, 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 connection in series-parallel H mode filter length, S type cavity volume filter length and S type 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；
5), by the flexible of the cone shaped elastic damping hole pipe of taper structure changes damping hole and the switch of slot apertures, pressure fluctuation adaptive-filtering is completed.
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 9, 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；Double-coil type detection of particulates requires that the characteristic of detection line coil and a reference coil is completely the same simultaneously, and this is usually extremely difficult to, and needs the detection coil 7 of design to have the function of on-line automatic regulation for this.Specifically, the winding of described detection coil 7 is made up of positive winding 71 and inverse winding 72, each winding is connected to an exciting current output module 73, this exciting current output module 73 is controlled by ECU module, its digital potentiometer used is AD5206, there is the output of 6 passages, can and ECU1 between realize single bus data transmission.ECU 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 71 is identical with the current characteristics in inverse winding 72, the axis direction of conduit under fluid pressure 9 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 73.
Further, described detection coil 4, reference coil 5 are in series, and both form a sensor.When in detection coil 4 without abrasive particle, owing to detection coil 4 is identical with reference coil 5 characteristic, there is no output voltage.And when abrasive particle enters detection coil 4, then causing the change of sensor output voltage, this variable quantity is metastable.When in fluid by there being metal bulky grain, cause disturbance of magnetic field, cause sensor coil 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.Utilize ferromagnetics and the non-ferromagnetic material metal particle otherwise impact to former magnetic field, cause phase of output signal contrary, can distinguish wear particle type in fluid, thus realize that signal conformance is good, reliability is high, the detection Double-pipe plug-in type structure changes twin coil fluid online monitoring system that signal is strong and error is little.
Due to the existence of hysteresis, after ferromagnetic material is magnetized into saturation, even if cancelling externally-applied magnetic field, the magnetic induction in material still returns less than zero point, needs externally-applied magnetic field demagnetization.In order to prevent magnetic microparticles from entering hydraulic circuit, sensitive to pollution Hydraulic Elements cause damage, devise demagnetization module 9, including remanent magnetism sensor and demagnetizer.ECU1 controls the demagnetization intensity of demagnetizer according to the detected value of demagnetizer exit remanent magnetism sensor.The demagnetization method herein used is electromagnetism demagnetization, and method is the opposing magnetic field by add suitable so that the magnetic induction in material comes back to zero point, and magnetic field intensity or electric current must invert in order and gradually reduce.
The concrete grammar using above-mentioned supervising device to be monitored hydraulic oil is as follows:
1), the fluid in fluid pressure line 9 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 detection coil 4 with the state of low speed, high concentration, bulky grain and big fiber number in batches subsequently, ECU1 controls exciting current and keeps the magnetic field homogeneity of detection coil 4, 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 ECU regulation exciting current to compensate this difference, with keep output concordance.Flow parameter when flow transducer 7 is for detecting measurement, for measurement result correction.
10), time in detection coil 4 without abrasive particle, there is certain fluctuation in the total null voltage of sensor, owing to detection coil 4 is identical with reference coil 5 characteristic, does not has output voltage.And when abrasive particle enters detection coil, then causing the change of sensor output voltage, this variable quantity is metastable.When in fluid by there being metal bulky grain, cause disturbance of magnetic field, result in 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.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.Thus realize that signal conformance is good, reliability is high, the detection Double-pipe plug-in type structure changes twin coil fluid online monitoring system that signal is strong and error is little.
11), eliminating magnetic particle magnetic by demagnetization module 9, prevent magnetic microparticles from entering hydraulic circuit, sensitive to pollution Hydraulic Elements cause damage.
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. one kind uses the filtering of full frequency band structure changes, absorption and moulding Oil Monitoring equipment, it is arranged on fluid pressure line, it is characterised in that: include wave filter, separate adsorption module, rotate moulding module, detection coil, reference coil, demagnetization module, flow transducer and ECU；Wherein, described wave filter, separate adsorption module, rotate moulding module, detection coil, flow transducer, demagnetization module are successively set on fluid pressure line；Described detection coil, reference coil are in series；Described ECU is electrically connected with and controls wave filter, separates adsorption module, rotates moulding module, detection coil, reference coil, demagnetization module and flow transducer；Described wave filter includes input pipe, shell, outlet tube, S type elastic thin-wall, H mode filter and cascaded H mode filter；Wherein, described input pipe is connected to one end of shell, itself and hydraulic oil inlet docking；Described outlet tube is connected to the other end of shell, and itself and U-shaped separation of particles module are docked；Described S type elastic thin-wall is installed in shell along the radial direction of shell, forms expansion chamber and contraction chamber in it；Described input pipe, outlet tube and S type elastic thin-wall are collectively forming a S type cavity volume wave filter；Some taper structure changes damping holes are uniformly had in the axial direction of described S type elastic thin-wall；Described taper structure changes damping hole is made up of cone shaped elastic damping hole pipe and slot apertures；Resonance series cavity volume I and parallel resonance cavity volume is formed between described S type elastic thin-wall and shell；The outside of described resonance series cavity volume I sets a resonance series cavity volume II, inserts pipe by a taper and connect between described resonance series cavity volume I and resonance series cavity volume II；Described H mode filter is positioned at parallel resonance cavity volume, and it is connected with taper structure changes damping hole；Described cascaded H mode filter is positioned at resonance series cavity volume I and resonance series cavity volume II, and it is also connected with taper structure changes damping hole；Described H mode filter and cascaded H mode filter are axially symmetrical set, and form 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.
2. employing full frequency band structure changes filtering as claimed in claim 1, absorption and moulding Oil Monitoring equipment, it is characterised in that: the axis of described input pipe and outlet tube is the most on the same axis；The wider place of described taper structure changes damping hole opening is positioned at resonance series cavity volume I and parallel resonance cavity volume, and its taper angle is 10 °；The Young's modulus of described taper structure changes damping hole cone shaped elastic damping hole pipe is bigger than the Young's modulus of elastic thin-wall, can be with change in fluid pressure stretching or compression；The Young's modulus of slot apertures is bigger than the Young's modulus of cone shaped elastic damping hole pipe, can be with fluid opened by pressure or closedown；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 °.
3. employing full frequency band structure changes filtering as claimed in claim 1, absorption and moulding Oil Monitoring equipment, 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. employing full frequency band structure changes filtering as claimed in claim 1, absorption and moulding Oil Monitoring equipment, 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. employing full frequency band structure changes filtering as claimed in claim 1, absorption and moulding Oil Monitoring equipment, 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. employing full frequency band structure changes filtering as claimed in claim 1, absorption and moulding Oil Monitoring equipment, 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. employing full frequency band structure changes filtering as claimed in claim 1, absorption and moulding Oil Monitoring equipment, 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. employing full frequency band structure changes filtering as claimed in claim 1, absorption and moulding Oil Monitoring equipment, 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. employing full frequency band structure changes filtering as claimed in claim 1, absorption and moulding Oil Monitoring equipment, 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. employing full frequency band structure changes filtering as claimed in claim 1, absorption and moulding Oil Monitoring equipment, it is characterized in that: the winding of described detection coil is made up of positive winding and inverse winding, each winding is connected to an exciting current output module, and this exciting current output module is controlled by ECU module.
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| CN201610313285.3A Pending CN105891061A (en) | 2016-05-12 | 2016-05-12 | Liquid oil monitoring device adopting full-band and variable-structure filtering, absorbing and shaping |
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