CN105864160A - Oil filtering device adopting filter, magnetization and adsorption - Google Patents

Abstract

The invention relates to an oil filtering device adopting a filter, magnetization and adsorption. The filter, a U-type particle separation module, an oil returning tube and an outer barrel of the oil filtering device are sequentially arranged on a bottom board; the filter is a full-band hydraulic system pressure pulsation filter and connected with the U-type particle separation module; the U-type particle separation module comprises a U-type tube; the U-type tube is provided with a temperature control module, a magnetization module, an adsorption module and a demagnetization module; the U-type particle separation module and the oil returning tube are connected through an oil inlet pipe of the oil returning tube; an inner tube is arranged inside the outer barrel and installed on an end cover; a spiral runner is contained in the inner tube and connected with the U-type particle separation module through an oil inlet pipe of the inner tube; the oil inlet pipe of the inner tube is located inside the oil inlet pipe of the oil returning tube and extends into the center of the U-type particle separation module; a filter element is arranged on the inner wall of the inner tube; and a hydraulic oil outlet is formed in the bottom of the outer barrel. The oil filtering device has the advantages of being good in filtering performance, high in adaptability and integration, long in service life and the like.

Description

A kind of oil-filtering apparatus using wave filter, magnetizing and adsorb

[technical field]

The present invention relates to a kind of hydraulic oil filter, be specifically related to a kind of oil strain using wave filter, magnetizing and adsorb Device, belongs to technical field of hydraulic equipment.

[background technology]

Statistics both domestic and external show, the fault of hydraulic system about 70%～85% is owing to oil contamination causes 's.Solid particle is then the pollutant the most universal in oil contamination, damaging effect is maximum.The liquid caused by solid grain contamination The pressure system failure accounts for the 70% of gross contamination fault.In particulate pollutant in hydraulic system oil liquid, metal filings accounting exists Between 20%～70%.Adopt an effective measure the solid grain contamination filtering in fluid, be the pass of Pollution Control in Hydraulic System Key, is also the Reliable guarantee of system safety operation.

Filter is the key element that hydraulic system filters solid grain contamination.Solid particle pollution in hydraulic oil Thing, outside the precipitable a part of larger particles of oil removal box, filters mainly by oil-filtering apparatus.Especially high pressure filtering device, mainly It is used for filtering the hydraulic oil of flow direction control valve and hydraulic cylinder, to protect the Hydraulic Elements of this kind of contamination resistance difference, therefore to liquid The cleannes of force feed require higher.

But, the high pressure filter that existing hydraulic system uses has the disadvantage that in (1) hydraulic system because of hydraulic pump Periodically oil extraction mechanism brings flow pulsation and pressure fluctuation, makes the filter element in wave filter operationally produce forced vibration, fall Low strainability；(2) cleannes of fluid are required different by all kinds of Hydraulic Elements, the particle diameter of the solid particle in fluid Size is the most different, needs for this diverse location in hydraulic system to install multiple dissimilar wave filter, thus brings Cost and the problem installing complexity；(3) filter in hydraulic system mainly uses cake filtration mode, and during filtration, filtrate is hung down Directly flowing in filter element surface, trapped solid particle forms filter cake progressive additive, the rate of filtration the most gradually under Fall, until filtrate stops flowing out, reduces the service life of filter element.

Therefore, for solving above-mentioned technical problem, the using wave filter, magnetize and adsorb of necessary offer a kind of innovation Oil-filtering apparatus, 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 a kind of strainability good, adaptability and integration Height, service life length use wave filter, the oil-filtering apparatus that magnetizes and adsorb.

For achieving the above object, the technical scheme that the present invention takes is: a kind of oil strain using wave filter, magnetizing and adsorb Device, it includes base plate, wave filter, U-shaped separation of particles module, oil returning tube, inner core, helical flow path, filter element, outer barrel and end Lid；Wherein, described wave filter, U-shaped separation of particles module, oil returning tube, outer barrel are sequentially placed on base plate；Described wave filter includes defeated Enter pipe, shell, outlet tube, elastic thin-wall, plug-in type H mode filter and plug-in type cascaded H mode filter；Wherein, described defeated Entering pipe and be connected to one end of shell, it extends in shell, itself and hydraulic oil inlet docking；Described outlet tube is connected to shell The other end, it extends in shell, and itself and U-shaped separation of particles module are docked；Described elastic thin-wall is installed along the radial direction of shell In shell；Described input pipe, outlet tube and elastic thin-wall are collectively forming a two-tube slip-on filter；Described elastic thin-wall and Resonance series cavity volume I, resonance series cavity volume II and parallel resonance cavity volume is formed between shell；Described resonance series cavity volume I and Separated by an elastic baffle between resonance series cavity volume II；Some tapers damping is uniformly had in the axial direction of described elastic thin-wall Hole；Described elastic baffle is provided with taper near input tube side and inserts pipe, and pipe connection resonance series cavity volume I and string are inserted in described taper Ally the communists the cavity volume II that shakes；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 Logical；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 U-shaped separation of particles module includes a U-tube, and U-tube is sequentially installed with temperature control module, magnetized module, suction Attached module and demagnetization module；The top of described U-shaped separation of particles module and oil returning tube is connected by an oil returning tube oil inlet pipe；Institute State inner core to be placed in outer barrel, if it is installed on end cap by a top board and bolt stem；Described helical flow path is contained in inner core In, connected by an inner core oil inlet pipe between itself and U-shaped separation of particles module；Described inner core oil inlet pipe is positioned at oil returning tube oil inlet pipe In, and extending into the central authorities of U-shaped separation of particles module, its diameter is less than oil returning tube oil inlet pipe diameter, and and oil returning tube oil inlet pipe It is coaxially disposed；Described filter element is arranged on the inwall of inner core；The bottom of said tub is provided with a hydraulic oil oil-out.

The present invention uses wave filter, magnetizes and the oil-filtering apparatus that adsorbs is further arranged to: described input pipe and output The axis of pipe 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 is held Intracavity, 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；Internal layer and the outer layer of described colloid damping layer are respectively outer layer bullet Property thin-walled and internal layer elastic thin-wall, connected by some pillars are fixing between outer layer elastic thin-wall and internal layer elastic thin-wall；Outside described It is filled with, in interlayer between layer elastic thin-wall and internal layer elastic thin-wall, the pure water adding antifreezing agent, in pure water, is suspended with porous Silica gel；Described colloid damping layer is connected with shell near one end of outlet tube；Described colloid damping layer is near one end of outlet tube It is provided with a piston.

The present invention uses wave filter, magnetizes and the oil-filtering apparatus that adsorbs is further arranged to: described temperature control module includes Heater, cooler and temperature sensor；Described heater uses the lubricating oil heater of the Chongqing gold letter of band temperature detection；Institute Stating cooler and select remover for surface evaporation type air cooling, the finned tube of cooler selects KLM type finned tube；Temperature sensor uses platinum resistance Temperature sensor.

The present invention uses wave filter, magnetizes and the oil-filtering apparatus that adsorbs is further arranged to: described magnetized module includes Aluminum matter pipeline, some windings, iron shell, flange and some magnetizing current output modules；Wherein, described some windings are respectively Being wound on outside aluminum matter pipeline, each winding is made up of positive winding and inverse winding；Described iron shell is coated on aluminum matter pipeline；Described method Orchid is welded on the two ends of aluminum matter pipeline；Each magnetizing current output module is connected to a winding.

The present invention uses wave filter, magnetizes and the oil-filtering apparatus that adsorbs is further arranged to: described adsorption module is concrete Using homopolarity adjacent type absorbing ring, 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, both sides of being connected with To contrary electric current 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, it is positioned at forward solenoid and reverse solenoid adjacent and forward solenoid and anti- To the intermediate point of solenoid axis.

The present invention uses wave filter, magnetizes and the oil-filtering apparatus that adsorbs is further arranged to: described adsorption module is concrete Use the homopolarity adjacent type absorbing ring of charged hammer, the homopolarity adjacent type absorbing ring of this charged hammer include 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 spiral shell Spool is respectively arranged in aluminium ring shape pipeline, and both are connected with electric current in opposite direction so that forward solenoid and reverse helical Pipe adjacent produces like pole；Described irony magnetic conduction cap is arranged on the inwall of aluminium ring shape pipeline, and it is positioned at forward helical Pipe and reverse solenoid adjacent and forward solenoid and the intermediate point of reverse solenoid axis；Described dividing plate is positioned at forward Between 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 present invention uses wave filter, magnetizes and the oil-filtering apparatus that adsorbs is further arranged to: the bottom of described oil returning tube It is provided with an overflow valve, bottom this overflow valve, is provided with an automatically controlled set screw；Described overflow valve is provided with an oil drain out, this oil drain out It is connected to a fuel tank by pipeline.

The present invention uses wave filter, magnetizes and the oil-filtering apparatus that adsorbs is further arranged to: the bottom of described inner core in Rounding mesa-shaped, it is by an inner core oil exit pipe and oil returning tube connection, and inner core oil exit pipe is provided with an automatically controlled check-valves.

The present invention uses wave filter, magnetizes and the oil-filtering apparatus that adsorb is further arranged to: the central authorities of described inner core are perpendicular Directly be provided with a hollow cylinder, hollow cylinder be arranged over pressure difference indicator, this pressure difference indicator is installed on end cap；In described Cylinder oil inlet pipe and the tangent connection of helical flow path.

The present invention uses wave filter, magnetizes and the oil-filtering apparatus that adsorbs is also configured to: the precision of described filter element is that 1-5 is micro- Rice.

Compared with prior art, there is advantages that

1. pulsed by the pressure/flow of filter attenuation hydraulic oil, make filter element not vibrate, to improve Strainability；Hydraulic oil realizes the separation of solid particle in U-shaped separation of particles module, makes the solid particle in fluid to tube wall Motion, at U-shaped separation of particles module outlet, the fluid rich in the near-wall of solid particle is entered by oil returning tube oil inlet pipe Fuel tank it is back to, in only the fluid of the pipeline center containing trace small particle microgranule is then entered by inner core oil inlet pipe after oil returning tube Cylinder carries out high-precision filtration, improves the service life of filter element, reduces filtering cost and complexity；Enter inner core oil inlet pipe Fluid flows into the helical flow path of inner core in the way of tangential influent stream, and inner tube wall is filter element, then filtrate is the tightest Patch filter core flow, filtrate is parallel to the surface of filter element and quickly flows, and the hydraulic oil after filtration is then perpendicular to cartridge surface direction stream Going out to urceolus, the microgranule of cartridge surface is implemented to sweep stream effect by this cross flow filter type, it is suppressed that the increase of filter cake thickness, It is deposited on the pollution granule bottom inner core and regularly can be discharged to oil returning tube by automatically controlled check-valves, thus improve filter element and use the longevity Life.

2., by controlling the temperature of hydraulic oil and magnetic field intensity, make that the granule in fluid is force-magnetized is gathered into bulky grain, And promote colloidal particles decomposition to melt, form efficient absorption by adsorption module, by degaussing gear, residual particles demagnetization is kept away Exempt to endanger Hydraulic Elements, so that solid particle is gathered into bulky grain and moves to near-wall in fluid.

3. the generation of non-uniform magnetic-field that magnetization needs, need multipair forward and reverse coil to and pass through different size of electric current, And current values can numeral set online.

[accompanying drawing explanation]

Fig. 1 be the present invention use wave filter, the structural representation of oil-filtering apparatus magnetizing and adsorbing.

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

Fig. 3 is the profile in Fig. 1 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 slotting Enter formula 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 schematic diagram of the U-shaped separation of particles module in Fig. 1.

Figure 12 is the structural representation of the magnetized module in Figure 11.

Figure 13 is the structural representation of the winding in Figure 12.

Figure 14 is the circuit diagram of the magnetizing current output module in Figure 12.

Figure 15 be the adsorption module of Figure 11 be the structural representation of homopolarity adjacent type absorbing ring.

Figure 16 be the adsorption module in Figure 11 be the structural representation of the homopolarity adjacent type absorbing ring of charged hammer.

[detailed description of the invention]

Referring to shown in Figure of description 1 to accompanying drawing 16, the present invention is a kind of oil strain using wave filter, magnetizing and adsorb Device, it is by base plate 6, wave filter 8, U-shaped separation of particles module 3, oil returning tube 7, inner core 15, helical flow path 17, filter element 18, outer barrel 19 and several parts such as end cap 25 composition.Wherein, described wave filter 8, U-shaped separation of particles module 2, oil returning tube 7, outer barrel 19 are successively It is placed on base plate 6.

Described wave filter 8 is for inputting hydraulic oil, and the pulsation pressure of the high, medium and low frequency range that can decay in hydraulic system Power, and suppression flowed fluctuation.Described wave filter 8 is by input pipe 81, shell 89, outlet tube 811, elastic thin-wall 87, plug-in type H type Several parts compositions such as wave filter 812 and plug-in type cascaded H mode filter 813.

Wherein, described input pipe 81 is connected to one end of shell 89, and it extends in shell 89 a length of 11, itself and one Hydraulic oil inlet 1 is docked；Described outlet tube 811 is connected to the other end of shell 89, and it extends into a length of l2 in shell 89, Itself and U-shaped separation of particles module 3 are docked.Described elastic thin-wall 87 is installed in shell 89 along the radial direction of shell.Described input pipe 81 and outlet tube 811 axis 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 decay Hydraulic system high frequency pressure pulsations.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 input outfan insert the difference of 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.The pressure of different frequency When pulsating wave is by this wave filter, transmission coefficient is different with frequency.Frequency is the highest, then transmission coefficient is the least, and this shows high frequency Pressure pulse wave decay the most severe when device after filtering, thus serve eliminate high frequency pressure pulsations effect.

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, pressure oscillation Act on convection cell on fluid and produce 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 absorbs Pressure fluctuation energy.

Described elastic thin-wall 87 weakens hydraulic system medium-high frequency pressure fluctuation by being forced to mechanical vibration.By lumped parameter The elastic thin-wall natural frequency that method obtains after processing 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 generally ratio H type of elastic thin-wall 87 The natural frequency of wave filter is high, and its attenuation band is also wide than H mode filter.In relatively wide frequency band range, elastic Thin-walled 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, 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, flows into the periodically pulsing pressure continuous action of Double-pipe plug-in type cavity volume at bullet Property thin-walled inside and outside wall on, owing to having between inside and outside wall, pillar is fixing to be connected, and inside and outside elastic thin-wall is simultaneously by the frequency of fluctuation pressure Rate does periodic vibration, and this forced vibration consumes the pressure fluctuation energy of fluid, thus realizes the filtering of Mid Frequency pressure.By void Merit principle understands, and the ability that elastic thin-wall consumes fluid pulsation pressure energy is straight with potential energy during its forced vibration and kinetic energy sum Connecing relevant, 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 Less, representative value is less than 0.1mm.

Further, resonance series cavity volume I84, resonance series cavity volume are formed between described elastic thin-wall 87 and shell 89 II83 and parallel resonance cavity volume 85, described cavity volume 83,84,85 is across whole wave filter, it is hereby achieved that bigger resonance Cavity volume volume, strengthens attenuating.By an elastic baffle between described resonance series cavity volume I84 and resonance series cavity volume II5 810 separate.Uniformly having some conical damping holes 86 in the axial direction of described elastic thin-wall 87, described conical damping hole 86 opening is relatively Wide place 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 near defeated Entering pipe 81 side and be provided with taper insertion pipe 82, described taper is inserted pipe 82 and is 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.Press The wave filter natural angular frequency that lumped-parameter method obtains after processing 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, its Also it is 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 slotting Enter formula connection in series-parallel H mode filter, for broadening frequency filtering scope and make overall structure more compact.This is created circumferentially interface and divides The multiple plug-in type connection in series-parallel H mode filters (only depicting 2 in figure) of cloth, separate with dividing plate 820 each other.

By Fig. 6 plug-in type H mode filter and plug-in type cascaded H mode filter frequency characteristic and formula (1) (2) (3) Finding, plug-in type cascaded H mode filter has 2 natural angular frequencies, and at crest, filter effect is preferable, the most basic at trough There is no filter effect；Plug-in type H mode filter has 1 natural angular frequency, and at crest, filter effect is preferable equally, and at trough Place does not has filter effect the most substantially；Select suitable filter parameter, make the natural angular frequency of plug-in type H mode filter just fall Between 2 natural angular frequencies of plug-in type cascaded H mode filter, as it is shown in fig. 7, both define in certain frequency range 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 at trough All can guarantee that preferable filter effect.Multiple plug-in type connection in series-parallel H mode filters constitute bank of filters both can cover whole in Low-frequency range, 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.Internal layer and the outer layer of described colloid damping layer 88 divide Not Wei outer layer elastic thin-wall 81 and internal layer elastic thin-wall 82, if by the Heavenly Stems and Earthly Branches between outer layer elastic thin-wall 81 and internal layer elastic thin-wall 82 Post 814 is fixing to be connected.It is filled with in interlayer between outer layer elastic thin-wall 81 and internal layer elastic thin-wall 82 and adds the pure of antifreezing agent Water 816, is suspended with Bio-sil 815 in pure water 816.Described colloid damping layer 88 is near one end of outlet tube 811 and shell 89 are connected；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, at pressure by pillar 814 is fixing When pulsation 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, to pressure Power pulsation does not has damping action；The flow pulsation in 817 sensation level directions of piston of colloid damping layer 88, flow pulsation strengthens Time, piston 817 pressurized makes colloid damping layer shrink, and squeezing action makes the water in colloid damping layer 88 by nanoscale transfer passage Enter micron order central void；When flow pulsation weakens, piston 817 is by back-pressure, and now colloid damping layer expands, colloid damping layer In water from central void through passage discharge.In the process, due to mechanics effect, the channel table of silica gel 815 microchannel sorption The roughness effect of face molecular scale and chemistry heterogeneous body effect, piston follow colloid damping layer shrink and expansion process is done " gas- Liquid-solid " interfactial work on border, thus flow systolic implementation is decayed, its substantially parallel R mode filter.This filtering Device is relative to the advantage of general liquid condenser: it is decayed flow by the way of the interfactial work on " gas-liquid-solid " border Pulsation, can absorb a large amount of mechanical energy in the case of not producing heat, and energy expenditure does not relies on piston speed, decay effect Rate 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 components Suddenly stop or running, and when the opening of valve changes, the characteristic impedance of pipe-line system can be caused to undergo mutation, so that former pipe Pressure curve with change in location in time in road changes the most therewith, then the position of pressure peak also changes.Due to the present invention The axial length of wave filter be designed as pulsing wavelength, and the plug-in type connection in series-parallel H type filter of wave filter more than system main pressure The cavity volume length of ripple device group, the length of Double-pipe plug-in type cavity volume wave filter and the length of elastic thin-wall and wave filter axial length phase Deng, it is ensured that pressure peak position is constantly in the effective range of wave filter；And plug-in type connection in series-parallel H mode filter Conical damping hole is opened on elastic thin-wall, is uniformly distributed in the axial direction so that the pressure peak change in location property to wave filter Can have little to no effect, it is achieved thereby that operating mode adaptive-filtering function.In view of three kinds of filter structure axial dimensions and filtering Device is suitable, and 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 filter of intermediate frequency pressure fluctuation Ripple；

3), by plug-in type connection in series-parallel H mode filter group, insert pipe by conical damping hole, taper and fluid produces altogether Shake, 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 string is also Connection H mode filter length, Double-pipe plug-in type filter length and elastic thin-wall 87 length are equal with filter length, make pressure spike Value position is constantly in the effective range of wave filter, it is achieved the filtering of pressure fluctuation when system condition changes.

Described U-shaped separation of particles module 3 includes a U-tube 31, and U-tube 31 is sequentially installed with temperature control module 32, magnetization Module 33, adsorption module 34 and demagnetization module 35.

Described temperature control module 32 main purpose is to provide optimal magnetization temperature 40-50 DEG C, also for magnetized module 33 simultaneously Having the effect of fluid viscosity reduction concurrently, it includes heater, cooler and temperature sensor.Described heater uses band temperature detection The lubricating oil heater of Chongqing gold letter.Described cooler can be selected for remover for surface evaporation type air cooling, the advantage having water-cooled and air cooling concurrently, Good heat dissipation effect, uses light pipe, and fluid resistance is little；Cooler fin type is high wing, and finned tube selects KLM type finned tube, heat transfer Performance is good, and thermal contact resistance is little, and fin and pipe contact area are big, and closely, firmly, it is good to bear cold and hot sudden turn of events ability, fin in laminating Root weather-resistant performance is high；The bank of tubes number optimum of air cooler is 8.Described temperature sensor uses platinum resistance temperature sensing Device.

Described magnetized module 33 realizes the force-magnetized of metallic particles, and makes micron-sized metallic particles aggregate into big Grain, it is simple to subsequent adsorbtion separates.Magnetized module 32 it is also required to provide non-uniform magnetic-field simultaneously, enters the colloidal particles in hydraulic oil Row magnetization is decomposed, the microgranule making colloid particulate breakup be smaller particle size, pollution abatement.

Described magnetized module 33 is by aluminum matter pipeline 331, some windings 332, iron shell 333, flange 334 and some magnetic Galvanic current output module 335 forms.Wherein, described aluminum matter pipeline 331 makes fluid flow there through and by magnetization treatment, and aluminum Pcrmeability the lowest, can make pipeline 331 obtains higher magnetic field intensity.

Described some windings 332, rotating around outside aluminum matter pipeline 331, are coated insulation by the copper wire of a diameter of about 1.0mm Paint is made.Each winding 332 is all separate setting, is controlled by corresponding magnetizing current output module 335 respectively, Qi Zhong electricity Flow and need different according to system.Separate owing to often enclosing winding 332, its exit can cause the electric current that this coil forms Ring is not real " justifying ", but has individual breach, and this can cause the radial distribution of aluminum matter pipeline 331 internal magnetic field uneven, thus Affect magnetic efficiency.For solving this problem, the often circle winding 332 of this creation is all made up of positive winding 336 and inverse winding 337, mesh Be to produce the magnetic field in same polarity direction and to make up the magnetic field that breach causes unbalanced simultaneously.In positive winding and inverse winding Size of current is equal.Aluminum matter pipeline 331 axis direction is arranged with multipair forward and reverse winding, by different electric currents, in order to shape Become the non-uniform magnetic-field of aforementioned claim.

Described iron shell 333 is coated on aluminum matter pipeline 331, and the material of irony can mask most magnetic flux.Institute State flange 334 and be welded on the two ends of aluminum matter pipeline 331, and by flange flange 334 in U-tube 20.

Each magnetizing current output module 335 is connected to a winding 332, and it utilizes digital potentiometer real time modifying resistance Feature, it is achieved the real-time control of non-uniform magnetic-field.The circuit theory diagrams of described magnetizing current output module 335 can be found in accompanying drawing 5, Its digital potentiometer used is AD5206, has the defeated of 6 passages.Amplifier AD8601 and metal-oxide-semiconductor 2N7002 are real by negative feedback Show the output of high-precision voltage follow.Constant High-current output have employed the high voltage of Texas Instrument (TI), the fortune of big electric current Put OPA 549.

Described adsorption module 34 is for adsorbing the big microgranule of magnetic polymeric after magnetized module 33 magnetizes, and it can use homopolarity Adjacent type absorbing ring, this homopolarity adjacent type absorbing ring is by aluminium ring shape pipeline 341, forward solenoid 342, reverse solenoid 343 And the parts such as irony magnetic conduction cap 344 composition.Wherein, described forward solenoid 342 and reverse solenoid 343 are respectively arranged in aluminum Matter circulating line 341, both are connected with electric current in opposite direction so that forward solenoid 342 and reverse solenoid 343 adjacent produce Raw like pole.Described irony magnetic conduction cap 344 is arranged on the inwall of aluminium ring shape pipeline 341, and it is positioned at forward solenoid 342 With reverse solenoid 343 adjacent and forward solenoid 342 and the intermediate point of reverse solenoid 343 axis.

The design principle of described homopolarity adjacent type absorbing ring is as follows: energising forward solenoid 342, reverse solenoid 343, phase Adjacent forward solenoid 342, reverse solenoid 343 are connected with electric current in opposite direction so that forward solenoid 342, reverse helical Pipe 343 adjacent produces like pole；Meanwhile, aluminium ring shape pipeline 341 can improve magnetic circuit, strengthens the magnetic field at inner-walls of duct Intensity, strengthens the irony magnetic conduction cap 344 capture absorbability to granule.Each forward solenoid 342, reverse solenoid 343 electric current 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 adsorption module 34 may be used without charged hammer, this charged hammer Homopolarity adjacent type absorbing ring by aluminium ring shape pipeline 341, forward solenoid 342, reverse solenoid 343, irony magnetic conduction cap 344, dividing plate 345, the parts such as hammer 346 and electric magnet 347 that shock by electricity form.Wherein, described forward solenoid 342 and reverse helical Pipe 343 is respectively arranged in aluminium ring shape pipeline 341, and both are connected with electric current in opposite direction so that forward solenoid 342 is with reverse Solenoid 343 adjacent produces like pole.Described irony magnetic conduction cap 344 is arranged on the inwall of aluminium ring shape pipeline 341, its It is positioned at forward solenoid 342 and reverse solenoid 343 adjacent and forward solenoid 342 and reverse solenoid 343 axis Intermediate point.Described electric shock hammer 346 and electric magnet 347 are between dividing plate 345.Described electric magnet 347 connects and can promote electric shock Hammer 346, makes electric shock hammer 346 percussion aluminium ring shape pipeline 342 inwall.

The design principle of the homopolarity adjacent type absorbing ring of described charged hammer is as follows: energising forward solenoid 342, reverse spiral shell Spool 343, adjacent forward solenoid 342, reverse solenoid 343 are connected with electric current in opposite direction so that forward solenoid 342, reverse solenoid 343 adjacent produces like pole；Meanwhile, aluminium ring shape pipeline 341 can improve magnetic circuit, strengthens pipeline Magnetic field intensity at inwall, strengthens the irony magnetic conduction cap 344 capture absorbability to granule.Each forward solenoid 342, reverse spiral shell Spool 343 electric current can be different with concentration and change, to obtain optimal adsorption performance according to the size of granule.And by electric shock The setting of hammer 346, prevents granule bulk deposition at irony magnetic conduction cap 344, affects adsorption effect.Now, by electric magnet 347 Control the inwall of electric shock hammer 346 percussion pipeline 341 so that adsorbed granule scatter to both sides.Meanwhile, pipeline is being cleaned When 341, the percussion of electric shock hammer 346 can also improve cleaning performance.

Described adsorption module 34 is designed to U-shaped, and when fluid enters U-shaped absorption pipeline, granule is at gravity, the work of centrifugal force Under with, to side, tube wall moves, and plus magnetic field force effect, moves radially speed and accelerates, and the efficiency of granular absorption is improved； Fluid leave U-shaped absorption pipeline rise time, making a concerted effort so that the diagonally lower direction motion of granule, prolongation of gravity and magnetic field force The numerical density time, improve the efficiency of granular absorption.

Described demagnetization module 35 gives magnetized particles demagnetization, prevents residual magnetism microgranule from entering hydraulic pressure by oil returning tube oil inlet pipe Loop, sensitive to pollution Hydraulic Elements cause damage.

The top of described U-shaped separation of particles module 3 and oil returning tube 7 is connected by an oil returning tube oil inlet pipe 22；By U-shaped micro- After grain separation module 3 processes, the fluid of U-tube 31 near-wall, rich in aggregated particles, is entered back by oil returning tube oil inlet pipe 22 It is back to fuel tank after oil cylinder 7.

The bottom of described oil returning tube 7 is provided with an overflow valve 2, is provided with an automatically controlled set screw 9 bottom this overflow valve 2；Described Overflow valve 2 is provided with an oil drain out 10, and this oil drain out 10 is connected to a fuel tank 11 by pipeline 20.

Described inner core 15 is placed in outer barrel 19, if it is installed on end cap 25 by a top board 13 and bolt stem 21.Institute State helical flow path 17 to be contained in inner core 15, connected by an inner core oil inlet pipe 12 between itself and U-shaped separation of particles module 3, tool Saying of body, described inner core oil inlet pipe 12 and the tangent connection of helical flow path 17.The fluid of the U-tube 31 pipeline center only granule Han trace Footpath microgranule, enters inner core 15 by inner core oil inlet pipe 12 and realizes high-precision filtration, thus realize solid particle and separate.Further , described inner core oil inlet pipe 12 is positioned at oil returning tube oil inlet pipe 22, and extends into the central authorities of U-shaped separation of particles module 3, its diameter Less than oil returning tube oil inlet pipe 22 diameter, and it is coaxially disposed with oil returning tube oil inlet pipe 22.

Further, the bottom of described inner core 15 is rounding mesa-shaped, and it is connected by an inner core oil exit pipe 23 and oil returning tube 7 Connecing, inner core oil exit pipe 23 is provided with an automatically controlled check-valves 24.The center upright of described inner core 15 is provided with a hollow cylinder 16, hollow Cylinder 16 be arranged over pressure difference indicator 14, this pressure difference indicator 14 is installed on end cap 25.

Described filter element 18 is arranged on the inwall of inner core 15, and its precision is 1-5 micron.

The bottom of said tub 19 is provided with a hydraulic oil oil-out 5, the hydraulic oil that will have been filtered by hydraulic oil oil-out 5 Discharge.

In the present invention, owing to U-shaped separation of particles module 3 is to solid particle separation of polymeric effect in fluid, at U-shaped microgranule In the fluid in separation module 3 exit, the fluid at the center only small particle microgranule Han trace, this part fluid is from inner core oil inlet pipe 12 It is flowed into inner core 15 and carries out high-precision filtration；And the fluid of near-wall is rich in aggregated particles, this part fluid passes through oil returning tube Oil inlet pipe 22 enters oil returning tube 7, then flows back to fuel tank 11 through the oil drain out 10 of overflow valve 2, thus realizes solid particle by particle Footpath shunting filtering.Herein, oil returning tube 7 and overflow valve 2 serve aforesaid macrofiltration, thus save filter number, fall Low system cost and complexity.The automatically controlled set screw 9 of overflow valve 2 is used for regulating oil pressure relief, is adjusted to by its pressure slightly Less than pressure at filtering outlet, to ensure inner core 15 filtering traffic.

It addition, traditional filter mainly uses cake filtration mode, during filtration, filtrate is perpendicular to filter element surface stream Dynamic, trapped solid particle forms filter cake progressive additive, and the rate of filtration is gradually reduced the most therewith, until filtrate stops stream Go out, reduce the service life of filter element.In this present invention, carry the filtrate of small particle microgranule from inner core oil inlet pipe 12 Flowing into the helical flow path 17 of inner core 15 in the way of tangential influent stream, inner core 15 wall of helical duct 17 side is high-precision filter element 18, filtrate is close to filter element 18 surface under the influence of centrifugal force, and filtrate is parallel to the surface of filter element 18 and quickly flows, after filtration Hydraulic oil is then perpendicular to filter element 18 surface direction and flows out to urceolus 19, and the direction of the two flowing is orthogonal staggered, therefore claims it Filter for cross flow.The quickly flowing of filtrate is applied with shearing to the microgranule being gathered in filter element 18 surface and sweeps stream effect, thus presses down Having made the increase of filter cake thickness so that rate of filtration near constant, filter pressure also will not raise with the passing of time, filter element Service life thus increase substantially.Along with the accumulation of filtration time, it is deposited on the pollution granule bottom inner core 15 inverted round stage Being stepped up, the rate of filtration slowly declines, and in inner core 15, unfiltered filtrate rises along the hollow cylinder 16 at center, now, and pressure Difference indicator 14 works, and monitors the change of its pressure, that is the stopping state of filter element 18 bottom inner core 15, if exceeding threshold value, then Regulate automatically controlled set screw 9 and reduce oil pressure relief, and open check-valves 24 simultaneously, make bottom inner core 15 containing more pollution granule Filtrate is discharged to oil returning tube 7 by inner core oil exit pipe 23 under differential pressure action, it is to avoid bottom, filter element 18 blockage deteriorates, from And extend filter element 18 service life.

The processing step using above-mentioned oil-filtering apparatus to process backflow force feed is as follows:

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

2), hydraulic oil enters the temperature control module 32 of U-shaped separation of particles module 3, regulates oil temperature to by temperature control module 32 Good magnetization temperature 40-50 DEG C, enters magnetized module 33 afterwards；

3), make the metallic particles in fluid be magnetized in magnetic field by magnetized module 33, and make micron-sized metal Grain aggregates into bulky grain；Enter adsorption module 34 afterwards；

4), the magnetic polymeric microgranule in oil return is adsorbed by adsorption module 34；Enter demagnetization module 35 afterwards；

5), magnetic particle magnetic is eliminated by demagnetization module 35；

6), the fluid of U-shaped separation of particles module 3 near-wall refluxes after entering oil returning tube 7 by oil returning tube oil inlet pipe 22 To fuel tank, the fluid of the pipeline center containing trace small particle microgranule then enters inner core 15 by inner core oil inlet pipe 12 and carries out high-precision Spend filter；

7), the fluid carrying small particle microgranule flows into the helical flow path 17 of inner core 15 in the way of tangential influent stream, and fluid exists It is close to filter core flow under the effect of centrifugal force, and carries out high-precision filtration；

8), the fluid after high-precision filtration enters urceolus 19, and is discharged by the hydraulic oil oil-out 5 bottom urceolus 19.

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

Claims (10)

1. the oil-filtering apparatus using wave filter, magnetizing and adsorb, it is characterised in that: include base plate, wave filter, U-shaped microgranule Separation module, oil returning tube, inner core, helical flow path, filter element, outer barrel and end cap；Wherein, described wave filter, U-shaped separation of particles mould Block, oil returning tube, outer barrel are sequentially placed on base plate；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；Wherein, described input pipe is connected to one end of shell, and it extends into shell In, itself and hydraulic oil inlet docking；Described outlet tube is connected to the other end of shell, and it extends in shell, and it is with U-shaped micro- Grain separation module docking；Described elastic thin-wall is installed in shell along the radial direction of shell；Described input pipe, outlet tube and Thin Elastic Wall is collectively forming a two-tube slip-on filter；Resonance series cavity volume I, resonance series is formed between described elastic thin-wall and shell Cavity volume II and parallel resonance cavity volume；Between described resonance series cavity volume I and resonance series cavity volume II by an elastic baffle every Open；Some conical damping holes are uniformly had in the axial direction of described elastic thin-wall；Described elastic baffle is provided with cone near input tube side Shape 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 Being positioned at parallel resonance cavity volume, it is connected with conical damping hole；Described plug-in type cascaded H mode filter is positioned at resonance series to be held In chamber I and resonance series cavity volume II, it is also connected with conical damping hole；Described plug-in type H mode filter and plug-in type cascaded H Mode filter is axially symmetrical set, and forms plug-in type connection in series-parallel H mode filter；Described U-shaped separation of particles module includes a U Type pipe, U-tube is sequentially installed with temperature control module, magnetized module, adsorption module and demagnetization module；Described U-shaped separation of particles The top of module and oil returning tube is connected by an oil returning tube oil inlet pipe；Described inner core is placed in outer barrel, its by a top board and If bolt stem is installed on end cap；Described helical flow path is contained in inner core, in passing through one between itself and U-shaped separation of particles module Cylinder oil inlet pipe connects；Described inner core oil inlet pipe is positioned at oil returning tube oil inlet pipe, and extends into the central authorities of U-shaped separation of particles module, Its diameter is less than oil returning tube oil inlet pipe diameter, and is coaxially disposed with oil returning tube oil inlet pipe；Described filter element is arranged on the inwall of inner core On；The bottom of said tub is provided with a hydraulic oil oil-out.

Use wave filter, the oil-filtering apparatus magnetizing and adsorbing the most as claimed in claim 1, it is characterised in that: described input pipe With the axis of outlet tube 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 connection In resonance cavity volume, its taper angle is 10 °；Described taper is inserted the wider place of tube opening and is positioned at resonance series cavity volume II, its tapering Angle is 10 °；The inner side of described elastic thin-wall is provided with colloid damping layer；Outside the internal layer of described colloid damping layer and outer layer are respectively Layer elastic thin-wall and internal layer elastic thin-wall, connected by some pillars are fixing between outer layer elastic thin-wall and internal layer elastic thin-wall；Institute It is filled with the pure water adding antifreezing agent in stating the interlayer between outer layer elastic thin-wall and internal layer elastic thin-wall, is suspended with in pure water Bio-sil；Described colloid damping layer is connected with shell near one end of outlet tube；Described colloid damping layer is near outlet tube One end is provided with a piston.

Use wave filter, the oil-filtering apparatus magnetizing and adsorbing the most as claimed in claim 1, it is characterised in that: described temperature control mould Block includes heater, cooler and temperature sensor；Described heater uses the lubricating oil of the Chongqing gold letter of band temperature detection to add Hot device；Remover for surface evaporation type air cooling selected by described cooler, and the finned tube of cooler selects KLM type finned tube；Temperature sensor is adopted Use platinum resistance temperature sensor.

Use wave filter, the oil-filtering apparatus magnetizing and adsorbing the most as claimed in claim 1, it is characterised in that: described magnetization Block includes aluminum matter pipeline, some windings, iron shell, flange and some magnetizing current output modules；Wherein, described some around Group is wound on outside aluminum matter pipeline respectively, and each winding is made up of positive winding and inverse winding；Described iron shell is coated on aluminum matter pipeline； Described flange welding is at the two ends of aluminum matter pipeline；Each magnetizing current output module is connected to a winding.

Use wave filter, the oil-filtering apparatus magnetizing and adsorbing the most as claimed in claim 1, it is characterised in that: described absorption mould Block specifically uses homopolarity adjacent type absorbing ring, this homopolarity adjacent type absorbing ring to include aluminium ring shape pipeline, forward solenoid, reversely Solenoid and irony magnetic conduction cap；Described forward solenoid and reverse solenoid are respectively arranged in aluminium ring shape pipeline, both It is 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 helical Pipe and the intermediate point of reverse solenoid axis.

Use wave filter, the oil-filtering apparatus magnetizing and adsorbing the most as claimed in claim 1, it is characterised in that: described absorption mould Block specifically 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 is respectively arranged in aluminium ring shape pipeline, and both are connected with electric current in opposite direction so that forward solenoid is with anti- Like pole is produced to solenoid adjacent；Described irony magnetic conduction cap is arranged on the inwall of aluminium ring shape pipeline, and it is just positioned at To solenoid and reverse solenoid adjacent and forward solenoid and the intermediate point of reverse solenoid axis；Described dividing plate position Between forward solenoid and reverse solenoid；Described electric shock hammer and electric magnet are between dividing plate；Described electric magnet connects also Electric shock hammer can be promoted, make electric shock hammer tap aluminium ring shape inner-walls of duct.

Use wave filter, the oil-filtering apparatus magnetizing and adsorbing the most as claimed in claim 1, it is characterised in that: described oil returning tube Bottom be provided with an overflow valve, be provided with an automatically controlled set screw bottom this overflow valve；Described overflow valve is provided with an oil drain out, should Oil drain out is connected to a fuel tank by pipeline.

Use wave filter, the oil-filtering apparatus magnetizing and adsorbing the most as claimed in claim 1, it is characterised in that: described inner core Bottom is in rounding mesa-shaped, and it is connected by an inner core oil exit pipe and oil returning tube, and inner core oil exit pipe is provided with an automatically controlled check-valves.

Use wave filter, the oil-filtering apparatus magnetizing and adsorbing the most as claimed in claim 1, it is characterised in that: described inner core Center upright is provided with a hollow cylinder, hollow cylinder be arranged over pressure difference indicator, this pressure difference indicator is installed on end cap； Described inner core oil inlet pipe and the tangent connection of helical flow path.

Use wave filter, the oil-filtering apparatus magnetizing and adsorbing the most as claimed in claim 1, it is characterised in that: described filter element Precision is 1-5 micron.