CN105864179A - Filtering device adopting wave suppression, magnetization and adsorption - Google Patents

Abstract

The invention relates to a filtering device adopting wave suppression, magnetization and adsorption. A filter, a U-shaped particle separation module, an oil return barrel and an outer barrel of the filtering device are sequentially arranged on a bottom plate; a work condition self-adaptive filter is adopted as the filter; the filter is connected with the U-shaped particle separation module; the U-shaped particle separation module comprises a U-shaped pipe which is provided with a temperature control module, a magnetization module, an adsorption module and a demagnetization module; the U-shaped particle separation module is connected with the oil return barrel through an oil inlet pipe of the oil return barrel; an inner barrel is arranged in the outer barrel and installed on an end cover; a spiral flow channel is contained in the inner barrel and connected with the U-shaped particle separation module through an oil inlet pipe of the inner barrel; the oil inlet pipe of the inner barrel is located in the oil inlet pipe of the oil return barrel and extends into the center of the U-shaped particle separation module; a filter element is arranged on the inner wall of the inner barrel; and a hydraulic oil outlet is formed in the bottom of the outer barrel. The filtering device adopting wave suppression, magnetization and adsorption has the multiple beneficial effects of being good in filtering performance, high in adaptability and integration performance, long in service life and the like.

Description

The defecator that a kind of employing presses down ripple, magnetizes and adsorb

[technical field]

The present invention relates to a kind of hydraulic oil filter, be specifically related to a kind of employing and press down ripple, magnetize and inhale Attached defecator, belongs to technical field of hydraulic equipment.

[background technology]

Statistics both domestic and external show, the fault of hydraulic system about 70%～85% is due to oil Liquid pollution causes.Solid particle is then the pollutant the most universal in oil contamination, damaging effect is maximum. The hydraulic system fault caused by solid grain contamination accounts for the 70% of gross contamination fault.In hydraulic system In particulate pollutant in fluid, metal filings accounting is between 20%～70%.Adopt an effective measure Filter the solid grain contamination in fluid, be the key of Pollution Control in Hydraulic System, be also system peace The Reliable guarantee of row for the national games.

Filter is the key element that hydraulic system filters solid grain contamination.Solid in hydraulic oil Particulate pollutant, outside the precipitable a part of larger particles of oil removal box, filters mainly by oil-filtering apparatus. Especially high pressure filtering device, is mainly used to filter flow direction control valve and the hydraulic oil of hydraulic cylinder, to protect Protect the Hydraulic Elements of this kind of contamination resistance difference, therefore the cleannes of hydraulic oil are required higher.

But, the high pressure filter that existing hydraulic system uses has the disadvantage that (1) hydraulic pressure system System brings flow pulsation and pressure fluctuation because of hydraulic pump periodically oil extraction mechanism, makes the filter in wave filter Core operationally produces forced vibration, reduces strainability；(2) all kinds of Hydraulic Elements are to fluid Cleannes require different, and the size of the solid particle in fluid is the most different, need for this At the diverse location of hydraulic system, multiple dissimilar wave filter to be installed, thus to bring cost and peace The problem of dress complexity；(3) filter in hydraulic system mainly uses cake filtration mode, filters Time filtrate be perpendicular to filter element surface flowing, trapped solid particle forms filter cake and also gradually increases Thickness, the rate of filtration is gradually reduced the most therewith until filtrate stops flowing out, and reduces the use of filter element Life-span.

Therefore, for solving above-mentioned technical problem, the employing of a kind of innovation of necessary offer presses down ripple, magnetic Change and the defecator of absorption, 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, adapt to Property and integration high, service life length the employing defecator that presses down ripple, magnetize and adsorb.

For achieving the above object, the technical scheme that the present invention takes is: a kind of use press down ripple, magnetization and The defecator of absorption, it includes base plate, wave filter, U-shaped separation of particles module, oil returning tube, interior Cylinder, helical flow path, filter element, outer barrel and end cap；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 input pipe, shell, defeated Go out pipe, elastic thin-wall, H mode filter and cascaded H mode filter；Wherein, described input pipe is even Being connected to one end of shell, it extends in shell, itself and hydraulic oil inlet docking；Described outlet tube Being connected to the other end of shell, it extends in shell, and itself and U-shaped separation of particles module are docked；Institute State elastic thin-wall to be installed in shell along the radial direction of shell；Described input pipe, outlet tube and elastic thin-wall It is collectively forming a two-tube slip-on filter；Some tapers are uniformly had in the axial direction of described elastic thin-wall Structure changes damping hole；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 elastic thin-wall and shell；Described string Ally the communists the shake outside of cavity volume I sets a resonance series cavity volume II, described resonance series cavity volume I and series connection altogether Shake and insert pipe connection by a taper between cavity volume II；This taper inserts pipe near input tube side；Described H mode filter is positioned at parallel resonance cavity volume, and it is connected with taper structure changes damping hole；Described string Connection H mode filter is positioned at resonance series cavity volume I and resonance series cavity volume II, and it also becomes knot with taper Structure damping hole is connected；Described H mode filter and cascaded H mode filter are axially symmetrical set, and Composition connection in series-parallel H mode filter；Described U-shaped separation of particles module includes a U-tube, U-tube On be sequentially installed with temperature control module, magnetized module, adsorption module and demagnetization module；Described U-shaped micro- The top of grain separation module and oil returning tube is connected by an oil returning tube oil inlet pipe；Described inner core is placed in outer barrel In, 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 Being positioned at oil returning tube oil inlet pipe, and extend into the central authorities of U-shaped separation of particles module, its diameter is less than back Oil cylinder oil inlet pipe diameter, and be coaxially disposed with oil returning tube oil inlet pipe；Described filter element is arranged on the interior of inner core On wall；The bottom of said tub is provided with a hydraulic oil oil-out.

The employing of the present invention presses down ripple, magnetize and the defecator that adsorbs is further arranged to: described input The axis of pipe and outlet tube is the most on the same axis；Position, described taper structure changes damping hole opening wider place In resonance series cavity volume I and parallel resonance cavity volume, its taper angle is 10 °；Described taper structure changes The Young's modulus of damping hole cone shaped elastic damping hole pipe is bigger than the Young's modulus of elastic thin-wall, can be with stream The change stretching of body pressure or compression；The Young's modulus of slot apertures is than the Young's modulus of cone shaped elastic damping hole pipe Want big, can be with fluid opened by pressure or closedown；Described taper is inserted the wider place of tube opening and is positioned at series connection altogether Shaking in cavity volume II, its taper angle is 10 °.

The employing of the present invention presses down ripple, magnetize and the defecator that adsorbs is further arranged to: described temperature control Module includes heater, cooler and temperature sensor；Described heater uses the weight of band temperature detection The lubricating oil heater of celebrating gold letter；Described cooler selects remover for surface evaporation type air cooling, the wing of cooler Sheet pipe selects KLM type finned tube；Temperature sensor uses platinum resistance temperature sensor.

The employing of the present invention presses down ripple, magnetize and the defecator that adsorbs is further arranged to: described magnetization Module includes aluminum matter pipeline, some windings, iron shell, flange and some magnetizing currents output mould Block；Wherein, described some windings are rotating around outside aluminum matter pipeline, and each winding is by positive winding and inverse winding Composition；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.

The employing of the present invention presses down ripple, magnetize and the defecator that adsorbs is further arranged to: described absorption Module specifically uses homopolarity adjacent type absorbing ring, this homopolarity adjacent type absorbing ring to include aluminium ring shape pipe Road, forward solenoid, reverse solenoid and irony magnetic conduction cap；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 spiral shell Spool and reverse solenoid adjacent produce like pole；Described irony magnetic conduction cap is arranged in aluminium ring shape On the inwall of pipeline, it is positioned at forward solenoid and reverse solenoid adjacent and forward solenoid Intermediate point with reverse solenoid axis.

The employing of the present invention presses down ripple, magnetize and the defecator that adsorbs is further arranged to: described absorption Module specifically uses the homopolarity adjacent type absorbing ring of charged hammer, and the adjacent type of homopolarity of this charged hammer is inhaled Follower ring 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 solenoid are respectively arranged in aluminium ring shape pipe In road, both are connected with electric current in opposite direction so that forward solenoid and reverse solenoid adjacent produce Raw 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 centre of reverse solenoid axis Point；Described dividing plate is between forward solenoid and reverse solenoid；Described electric shock hammer and electric magnet position Between dividing plate；Described electric magnet connects and can promote electric shock hammer, makes electric shock hammer tap aluminium ring shape pipe Road inwall.

The employing of the present invention presses down ripple, magnetize and the defecator that adsorbs is further arranged to: described oil return The bottom of cylinder is provided with an overflow valve, is provided with an automatically controlled set screw bottom this overflow valve；Described overflow valve Being provided with an oil drain out, this oil drain out is connected to a fuel tank by pipeline.

The employing of the present invention presses down ripple, magnetize and the defecator that adsorbs is further arranged to: described inner core Bottom be rounding mesa-shaped, it is connected by an inner core oil exit pipe and oil returning tube, and inner core oil exit pipe sets There is an automatically controlled check-valves.

The employing of the present invention presses down ripple, magnetize and the defecator that adsorbs is further arranged to: described inner core Center upright be provided with a hollow cylinder, hollow cylinder be arranged over pressure difference indicator, this pressure reduction refers to Show that device is installed on end cap；Described inner core oil inlet pipe and the tangent connection of helical flow path.

The employing of the present invention presses down ripple, magnetize and the defecator that adsorbs is also configured to: the essence of described filter element Degree is 1-5 micron.

Compared with prior art, there is advantages that

1. pulsed by the pressure/flow of filter attenuation hydraulic oil, make filter element not occur Vibration, to improve strainability；Hydraulic oil realizes dividing of solid particle in U-shaped separation of particles module From, make the solid particle in fluid to vessel wall motion, at U-shaped separation of particles module outlet, rich in The fluid of the near-wall of solid particle is back to fuel tank after entering oil returning tube by oil returning tube oil inlet pipe, The only fluid of the pipeline center containing trace small particle microgranule is then entered by inner core oil inlet pipe entrance inner core Row high-precision filtration, improves the service life of filter element, reduces filtering cost and complexity；Enter The fluid of inner core oil inlet pipe flows into the helical flow path of inner core in the way of tangential influent stream, and inner tube wall is filter Core, then filtrate is close to filter core flow under the influence of centrifugal force, and the surface that filtrate is parallel to filter element is quick Flowing, the hydraulic oil after filtration is then perpendicular to cartridge surface direction and flows out to urceolus, and this cross flows through The microgranule of cartridge surface is implemented to sweep stream effect by filter mode, it is suppressed that the increase of filter cake thickness, is deposited on Pollution granule bottom inner core regularly can be discharged to oil returning tube by automatically controlled check-valves, thus improves filter element Service life.

2., by controlling temperature and the magnetic field intensity of hydraulic oil, make the force-magnetized gathering of the granule in fluid Become bulky grain, and promote colloidal particles decomposition to melt, form efficient absorption by adsorption module, pass through Residual particles demagnetization is avoided endangering Hydraulic Elements by degaussing gear, so that solid particle is assembled in fluid Bulky grain is become to move to near-wall.

3. the generation of non-uniform magnetic-field that magnetization needs, need multipair forward and reverse coil to and by different greatly Little electric current, and current values can numeral setting online.

[accompanying drawing explanation]

Fig. 1 is the structural representation of defecator that the employing of the present invention presses down ripple, magnetizes and adsorb.

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 Double-pipe plug-in type wave filter.

Fig. 9 is the cross sectional representation of 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 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 that the structure of the homopolarity adjacent type absorbing ring of charged hammer is shown It is intended to.

[detailed description of the invention]

Referring to shown in Figure of description 1 to accompanying drawing 16, the present invention uses for one and presses down ripple, magnetization With the defecator of absorption, it is by base plate 6, wave filter 8, U-shaped separation of particles module 3, oil returning tube 7, several parts such as inner core 15, helical flow path 17, filter element 18, outer barrel 19 and end cap 25 composition. Wherein, described wave filter 8, U-shaped separation of particles module 2, oil returning tube 7, outer barrel 19 are sequentially placed into On base plate 6.

Described wave filter 8 for hydraulic oil is inputted, and can decay in hydraulic system high, medium and low The fluctuation pressure of frequency range, and suppression flowed fluctuation.Described wave filter 8 by input pipe 81, shell 88, Outlet tube 89, elastic thin-wall 87, H mode filter 812 and cascaded H mode filter 813 etc. are several Part composition.

Wherein, described input pipe 81 is connected to one end of shell 89, and it extends in shell 88, Itself and a hydraulic oil inlet 1 are docked；Described outlet tube 811 is connected to the other end of shell 89, and it prolongs Stretching in shell 88, itself and U-shaped separation of particles module 3 are docked.Described elastic thin-wall 87 is along shell Radial direction be installed in shell 88.The axis of described input pipe 81 and outlet tube 89 is not at same axle On line, so can improve the filter effect of more than 10%.

Described input pipe 81, outlet tube 89 and elastic thin-wall 87 are collectively forming a Double-pipe plug-in type filtering Device, thus hydraulic system high frequency pressure pulsations of decaying.The wave filter obtained after processing by lumped-parameter method Transmission coefficient is:

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

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 Insert length of tube L cavity volume total length and the difference of input outfan insertion length of tube sum

From above formula, Double-pipe plug-in type cavity volume wave filter is similar with the electric capacity effect in circuit.Different When the pressure pulse wave of 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 strict when device after filtering Evil, thus serve the effect eliminating high frequency pressure pulsations.

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

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

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

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

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

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

Substitute into actual parameter, above formula is carried out simulation analysis it is found that elastic thin-wall 87 intrinsic Frequency is generally high than the natural frequency of H mode filter, and its attenuation band is also wide than H mode filter. In relatively wide frequency band range, elastic thin-wall has good attenuating to pressure fluctuation.With Time, the elastic thin-wall radius in the filter construction of the present invention is bigger and relatively thin, and its natural frequency is more leaned on Nearly 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, S type Cavity volume is more weak to the damping capacity of pressure oscillation, flows into the periodically pulsing pressure of wave filter S type cavity volume Continuous action is on the inside and outside wall of elastic thin-wall 87, and 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, and this forced vibration consumes stream The pressure fluctuation energy of body, thus realize the filtering of Mid Frequency pressure.From the principle of virtual work, Thin Elastic The ability that wall consumes fluid pulsation pressure energy is direct with potential energy during its forced vibration and kinetic energy sum 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 is less, representative value is less than 0.1mm.

Further, between described elastic thin-wall 87 and shell 88 formed resonance series cavity volume I84 with And parallel resonance cavity volume 85.The outside of described resonance series cavity volume I84 sets a resonance series cavity volume II83, Pipe 82 is inserted even by a taper between described resonance series cavity volume I84 and resonance series cavity volume II83 Logical, this taper insertion pipe 82, near input pipe 81 side, makes resonance cavity volume I and II form unsymmetrical knot Structure, to reduce wave filter natural reonant frequency.Described taper is inserted the wider place of pipe 82 opening and is positioned at string Allying the communists and shake in cavity volume II83, its taper angle is 10 °.Uniformly open in the axial direction of described elastic thin-wall 87 There are some taper structure changes damping holes 86.

Described H mode filter 812 is positioned at parallel resonance cavity volume 85, and itself and taper structure changes damp Hole 86 is connected.The wider place of described taper structure changes damping hole 86 opening is positioned at resonance series cavity volume I84 With in parallel resonance cavity volume 85, its taper angle is 10 °.The filter obtained after processing by lumped-parameter method Ripple device natural angular frequency is:

$\begin{array}{cc}\mathrm{\ω}=\frac{a\·D_1}{D_2}\sqrt{\frac{1}{L_1{L}_2}}& (rad/s)\end{array}$

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 In, it is also connected with taper structure changes damping hole 86.After processing by lumped-parameter method, cascaded H Two natural angular frequencies of mode filter 813 are:

${\mathrm{\ω}}_1=\frac{\sqrt{\mathrm{\π}}a}{\sqrt{2}\sqrt{{\frac{{\mathrm{\πl}}_1({d_2}^2{l}_2+{d_4}^2{l}_4)}{4{d_1}^2}}_1+\frac{{{\mathrm{\πd}}_4}^2{l}_4{l}_3}{4{d_3}^2}+\sqrt{{\[{\frac{{\mathrm{\πl}}_1({d_2}^2{l}_2+{d_4}^2{l}_4)}{4{d_1}^2}}_1-\frac{{{\mathrm{\πd}}_4}^2{l}_4{l}_3}{4{d_3}^2}\]}^2+\frac{{\mathrm{\π}}^2{d_4}^4{l_4}^2{l}_1{l}_3}{4d_1^2{d}_3^2}}}}$

${\mathrm{\ω}}_2=\frac{\sqrt{\mathrm{\π}}a}{\sqrt{2}\sqrt{{\frac{{\mathrm{\πl}}_1({d_2}^2{l}_2+{d_4}^2{l}_4)}{4{d_1}^2}}_1+\frac{{{\mathrm{\πd}}_4}^2{l}_4{l}_3}{4{d_3}^2}-\sqrt{{\[{\frac{{\mathrm{\πl}}_1({d_2}^2{l}_2+{d_4}^2{l}_4)}{4{d_1}^2}}_1-\frac{{{\mathrm{\πd}}_4}^2{l}_4{l}_3}{4{d_3}^2}\]}^2+\frac{{\mathrm{\π}}^2{d_4}^4{l_4}^2{l}_1{l}_3}{4d_1^2{d}_3^2}}}}$

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), each other it Between separate with dividing plate 820, the resonance bands of these multiple wave filter is different, can after combining Cover whole medium and low frequency filtering frequency range, it is achieved the entire spectrum filtering of medium and low frequency section comprehensively.

All can be found by Fig. 6 H mode filter and cascaded H mode filter frequency characteristic and formula, series connection H mode filter has 2 natural angular frequencies, and at crest, filter effect is preferable, then base at trough Originally there is no filter effect；H mode filter has 1 natural angular frequency, equally filter effect at crest Preferably, at trough, the most substantially do not has filter effect；Select suitable filter parameter, make H type The natural angular frequency of wave filter just falls between 2 natural angular frequencies of cascaded H mode filter, as Shown in Fig. 7, in certain frequency range, both 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 at trough preferably Filter effect.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 by cone shaped elastic damping hole pipe 16 and slot apertures 15 compositions, taper narrow end is opened on elastic thin-wall 87.The wherein poplar of cone shaped elastic damping hole pipe 16 The Young's modulus of family name's modular ratio elastic thin-wall 87 wants big, 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 pressure Power is turned on and off.Therefore when the fluctuating frequency of pressure falls at high band, c-type cavity volume filter construction rises Filter action, cone shaped elastic damping hole pipe 16 and slot apertures 15 are all in Figure 10 (a) state；And work as Ripple frequency falls when Mid Frequency, and filter construction becomes c-type cavity volume filter construction and elastic thin-wall 87 filter structures concur, and 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 string H mode filter in parallel, c-type cavity volume filter construction and elastic thin-wall filter structure concur, Cone shaped elastic damping hole pipe 16 and slot apertures 15 are all in Figure 10 (b) state, due to plug-in type string also The natural frequency of connection H mode filter is designed to consistent, to fundamental frequency with these particular low frequency ripple frequencies The system that energy is big can play preferable filter effect；When ripple frequency falls beyond some characteristic frequency Low-frequency range time, cone shaped elastic damping hole pipe 16 and slot apertures 15 are all in Figure 10 (c) state.This The structure changes wave filter design of sample 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, can cause the spy of pipe-line system Property impedance is undergone mutation, so that former pipeline pressure curve with change in location in time changes the most therewith Become, then the position of pressure peak also changes.Axial length design due to the wave filter of the present invention For pulsing wavelength more than system main pressure, and the cavity volume of the connection in series-parallel H mode filter group of wave filter is long Degree, 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 connection in series-parallel H The taper structure changes damping hole of mode filter is opened on elastic thin-wall, is uniformly distributed in the axial direction, makes Obtain pressure peak change in location the performance of wave filter to be had little to no effect, it is achieved thereby that operating mode is adaptive Answer filter function.Suitable in view of three kinds of filter structure axial dimensions and wave filter, this bigger chi Very little 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 Double-pipe plug-in type wave filter by input pipe, and the cavity volume of expansion absorbs many Remaining liquid stream, completes the filtering of high frequency pressure pulsations；

2), by elastic thin-wall 87 forced vibration, the pressure fluctuation energy of fluid is consumed, in completing The filtering of pressure fluctuation frequently；

3), by connection in series-parallel H mode filter group, and taper structure changes damping hole, taper insertion pipe Produce resonance with fluid, 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 Connection in series-parallel H mode filter length, Double-pipe plug-in type filter length and elastic thin-wall 87 length are with filter Ripple device length is equal, makes pressure peak position be constantly in the effective range of wave filter, it is achieved to be The filtering of pressure fluctuation when system operating mode changes；

5), by stretching of the cone shaped elastic damping hole pipe of taper structure changes damping hole and opening of slot apertures Close, complete pressure fluctuation adaptive-filtering.

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, magnetized module 33, adsorption module 34 and demagnetization module 35.

Described temperature control module 32 main purpose is to provide optimal magnetization temperature for magnetized module 33 40-50 DEG C, the most also having the effect of fluid viscosity reduction concurrently, it includes heater, cooler and temperature sensing Device.Described heater uses the lubricating oil heater of the Chongqing gold letter of band temperature detection.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, use light Pipe, fluid resistance is little；Cooler fin type is high wing, and finned tube selects KLM type finned tube, passes Good in thermal property, thermal contact resistance is little, and fin is big with pipe contact area, and laminating closely, firmly, is born Cold and hot sudden turn of events ability is good, and fin root weather-resistant performance is high；The bank of tubes number optimum of air cooler is 8. Described temperature sensor uses platinum resistance temperature sensor.

Described magnetized module 33 realizes the force-magnetized of metallic particles, and makes micron-sized metallic particles Aggregate into bulky grain, it is simple to subsequent adsorbtion separates.Magnetized module 32 it is also required to provide non-homogeneous simultaneously Magnetic field, carries out magnetization and decomposes the colloidal particles in hydraulic oil, and making colloid particulate breakup is smaller particle The microgranule of size, pollution abatement.

Described magnetized module 33 is by aluminum matter pipeline 331, some windings 332, iron shell 333, method Orchid 334 and some magnetizing current output modules 335 form.Wherein, described aluminum matter pipeline 331 makes Fluid flows there through and by magnetization treatment, and the pcrmeability of aluminum is the lowest, can make in pipeline 331 Obtain higher magnetic field intensity.

Described some windings 332 are rotating around outside aluminum matter pipeline 331, by a diameter of about 1.0mm Copper wire coating insullac is made.Each winding 332 is all separate setting, respectively by corresponding magnetic Galvanic current output module 335 controls, and wherein electric current needs different according to system.Due to often enclose around Organizing 332 separate, the electric current loop that its exit can cause this coil to form is not real " justifying ", But having individual breach, this can cause the radial distribution of aluminum matter pipeline 331 internal magnetic field uneven, thus shadow Ring magnetic efficiency.For solving this problem, the often circle winding 332 of this creation is all by positive winding 336 and inverse Winding 337 forms in order to produce the magnetic field in same polarity direction and make up what breach caused simultaneously Magnetic field is unbalanced.Size of current in positive winding and inverse winding is equal.In aluminum matter pipeline 331 axis side Upwards it is arranged with multipair forward and reverse winding, by different electric currents, in order to form the non-homogeneous of aforementioned claim Magnetic field.

Described iron shell 333 is coated on aluminum matter pipeline 331, and the material of irony can mask big portion The magnetic flux divided.Described flange 334 is 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 The feature of Shi Xiugai resistance, it is achieved the real-time control of non-uniform magnetic-field.Described magnetizing current output module The circuit theory diagrams of 335 can be found in accompanying drawing 5, and its digital potentiometer used is AD5206, has 6 Passage defeated.Amplifier AD8601 and metal-oxide-semiconductor 2N7002 achieve high-precision electricity by negative feedback Pressure follows output.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 used for the absorption big microgranule of magnetic polymeric after magnetized module 33 magnetizes, It can use homopolarity adjacent type absorbing ring, this homopolarity adjacent type absorbing ring by aluminium ring shape pipeline 341, The parts compositions such as forward solenoid 342, reverse solenoid 343 and irony magnetic conduction cap 344.Wherein, Described forward solenoid 342 and reverse solenoid 343 are respectively arranged in aluminium ring shape pipeline 341, and two Person is 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, its It is positioned at forward solenoid 342 and reverse solenoid 343 adjacent and forward solenoid 342 and anti- Intermediate point to solenoid 343 axis.

The design principle of described homopolarity adjacent type absorbing ring is as follows: energising forward solenoid 342, reversely Solenoid 343, adjacent forward solenoid 342, reverse solenoid 343 are connected with electricity in opposite direction Stream so that forward solenoid 342, reverse solenoid 343 adjacent produce like pole；Meanwhile, Aluminium ring shape pipeline 341 can improve magnetic circuit, strengthens the magnetic field intensity at inner-walls of duct, strengthens irony The 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, The homopolarity adjacent type absorbing ring of this charged hammer by aluminium ring shape pipeline 341, forward solenoid 342, Reverse solenoid 343, irony magnetic conduction cap 344, dividing plate 345, electric shock hammer 346 and electric magnet 347 Form Deng parts.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 is with reverse Solenoid 343 adjacent produces like pole.Described irony magnetic conduction cap 344 is arranged in aluminium ring shape pipe On the inwall in road 341, its be positioned at forward solenoid 342 and reverse solenoid 343 adjacent and Forward solenoid 342 and the intermediate point of reverse solenoid 343 axis.Described electric shock hammer 346 and electromagnetism Ferrum 347 is 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 solenoid 343, adjacent forward solenoid 342, reverse solenoid 343 are connected with direction Contrary electric current so that forward solenoid 342, reverse solenoid 343 adjacent produce like pole； Meanwhile, aluminium ring shape pipeline 341 can improve magnetic circuit, strengthens the magnetic field intensity at inner-walls of duct, increases The strong irony magnetic conduction cap 344 capture absorbability to granule.Each forward solenoid 342, reverse helical Pipe 343 electric current can be different with concentration and change, to obtain best adsorption according to the size of granule Energy.And by the setting of electric shock hammer 346, prevent granule bulk deposition at irony magnetic conduction cap 344, Affect adsorption effect.Now, controlled in electric shock hammer 346 percussion pipeline 341 by electric magnet 347 Wall so that adsorbed granule scatter to both sides.Meanwhile, when cleaning pipeline 341, electric shock hammer The percussion of 346 can also improve cleaning performance.

Described adsorption module 34 is designed to U-shaped, and when fluid enters U-shaped absorption pipeline, granule exists Gravity, centrifugal force effect under, to side, tube wall moves, and plus magnetic field force effect, moves radially Speed is accelerated, and the efficiency of granular absorption is improved；When fluid leaves the rising of U-shaped absorption pipeline, Gravity and magnetic field force make a concerted effort so that granule diagonally under direction motion, when extending numerical density Between, improve the efficiency of granular absorption.

Described demagnetization module 35 gives magnetized particles demagnetization, prevents residual magnetism microgranule from being entered by oil returning tube Oil pipe enters hydraulic circuit, and sensitive to pollution Hydraulic Elements cause damage.

An oil returning tube oil inlet pipe 22 is passed through in the top of described U-shaped separation of particles module 3 and oil returning tube 7 Connect；By U-shaped separation of particles module 3 process after, the fluid of U-tube 31 near-wall rich in Aggregated particles, is back to fuel tank after entering oil returning tube 7 by oil returning tube oil inlet pipe 22.

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

Described inner core 15 is placed in outer barrel 19, if it is installed by a top board 13 and bolt stem 21 On end cap 25.Described helical flow path 17 is contained in inner core 15, itself and U-shaped separation of particles mould Connected by an inner core oil inlet pipe 12 between block 3, specifically, described inner core oil inlet pipe 12 and spiral shell The tangent connection in eddy flow road 17.The fluid of the U-tube 31 pipeline center only small particle microgranule Han trace is logical Cross inner core oil inlet pipe 12 to enter inner core 15 and realize 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 U-shaped micro- The central authorities of grain separation module 3, its diameter is less than oil returning tube oil inlet pipe 22 diameter, and enters with oil returning tube Oil pipe 22 is coaxially disposed.

Further, the bottom of described inner core 15 is rounding mesa-shaped, and it passes through an inner core oil exit pipe 23 Connecting with oil returning tube 7, inner core oil exit pipe 23 is provided with an automatically controlled check-valves 24.Described inner core 15 Center upright is provided with a hollow cylinder 16, hollow cylinder 16 be arranged over pressure difference indicator 14, should 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, is incited somebody to action by hydraulic oil oil-out 5 The hydraulic oil filtered is discharged.

In the present invention, due to U-shaped separation of particles module 3, solid particle separation of polymeric in fluid is made With, in the fluid in U-shaped separation of particles module 3 exit, the fluid at the center only small particle Han trace Microgranule, this part fluid is flowed into inner core 15 from inner core oil inlet pipe 12 and carries out high-precision filtration；And manage Fluid near wall is rich in aggregated particles, and this part fluid enters oil return by oil returning tube oil inlet pipe 22 Cylinder 7, then flow back to fuel tank 11 through the oil drain out 10 of overflow valve 2, thus realize solid particle by particle Footpath shunting filtering.Herein, oil returning tube 7 and overflow valve 2 serve aforesaid macrofiltration, thus save Save filter number, reduce system cost and complexity.The automatically controlled set screw 9 of overflow valve 2 For regulating oil pressure relief, its pressure is adjusted to slightly below pressure at filtering outlet, to ensure inner core 15 filtering traffics.

It addition, traditional filter mainly uses cake filtration mode, during filtration, filtrate is perpendicular to filter Element surface flows, and trapped solid particle forms filter cake progressive additive, and the rate of filtration is the most therewith It is gradually reduced, until filtrate stops flowing out, reduces the service life of filter element.In this present invention In, carry in the filtrate of small particle microgranule flows in the way of tangential influent stream from inner core oil inlet pipe 12 The helical flow path 17 of cylinder 15, inner core 15 wall of helical duct 17 side is high-precision filter element 18, filter Liquid 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 Dynamic, the hydraulic oil after filtration is then perpendicular to filter element 18 surface direction and flows out to urceolus 19, the two stream Dynamic direction is orthogonal staggered, therefore is called cross flow and filters.The quickly flowing of filtrate is to being gathered in The microgranule on filter element 18 surface is applied with shearing and sweeps stream effect, thus inhibits the increase of filter cake thickness, Making rate of filtration near constant, filter pressure also will not raise with the passing of time, making of filter element With the life-span thus increase substantially.Along with the accumulation of filtration time, it is deposited at the bottom of inner core 15 inverted round stage The pollution granule in portion is stepped up, and the rate of filtration slowly declines, unfiltered filtrate edge in inner core 15 The hollow cylinder 16 at center rises, and now, 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 reduce oil pressure relief, and open check-valves 24 simultaneously, make bottom inner core 15 containing more pollution granule Filtrate under differential pressure action, be discharged to oil returning tube 7 by inner core oil exit pipe 23, it is to avoid bottom filter element 18 blockage deteriorate, thus 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 pass through wave filter 8, wave filter 8 decay the height in hydraulic system, In, the fluctuation pressure of low-frequency range, and suppression flowed fluctuation；

2), hydraulic oil enters the temperature control module 32 of U-shaped separation of particles module 3, passes through temperature control module 32 regulation oil temperatures, to optimal magnetization temperature 40-50 DEG C, enter magnetized module 33 afterwards；

3), make the metallic particles in fluid be magnetized in magnetic field by magnetized module 33, and make micro- The metallic particles of meter level 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 mould afterwards Block 35；

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

6), the fluid of U-shaped separation of particles module 3 near-wall is entered back by oil returning tube oil inlet pipe 22 Being back to fuel tank after oil cylinder 7, the fluid of the pipeline center containing trace small particle microgranule then passes through inner core Oil inlet pipe 12 enters inner core 15 and carries out high-precision filtration；

7) fluid, carrying small particle microgranule flows into the spiral flow of inner core 15 in the way of tangential influent stream Road 17, fluid is close to filter core flow under the influence of centrifugal force, and is carried out high-precision filtration；

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

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

Claims (10)

1. the defecator that an employing presses down ripple, magnetizes and adsorb, it is characterised in that: include base plate, wave filter, U-shaped separation of particles 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 module, oil returning tube, outer barrel are sequentially placed on base plate；Described wave filter includes input pipe, shell, outlet tube, elastic thin-wall, H mode filter and cascaded H mode filter；Wherein, described input pipe is connected to one end of shell, and it extends in shell, itself and hydraulic oil inlet docking；Described outlet tube is connected to the other end of shell, and it extends in shell, and itself and U-shaped separation of particles module are docked；Described elastic thin-wall is installed in shell along the radial direction of shell；Described input pipe, outlet tube and elastic thin-wall are collectively forming a two-tube slip-on filter；Some taper structure changes damping holes are uniformly had in the axial direction of described 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 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；This taper inserts pipe near input tube side；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 U-shaped separation of particles module includes a U-tube, and U-tube is sequentially installed with temperature control module, magnetized module, adsorption 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；Described inner core is 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, is 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, and extends into the central authorities of U-shaped separation of particles module, and its diameter is less than oil returning tube oil inlet pipe diameter, and and oil returning tube oil inlet pipe be 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.

2. use the defecator pressing down ripple, magnetizing and adsorb as claimed in claim 1, it is characterised in that: the axis of described input pipe and outlet tube is the most on the same axis；The 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. use the defecator pressing down ripple, magnetizing and adsorb as claimed in claim 1, it is characterised in that: 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；Remover for surface evaporation type air cooling selected by described cooler, and the finned tube of cooler selects KLM type finned tube；Temperature sensor uses platinum resistance temperature sensor.

4. use the defecator pressing down ripple, magnetizing and adsorb as claimed in claim 1, it is characterised in that: described magnetized module includes aluminum matter pipeline, some windings, iron shell, flange and some magnetizing current output modules；Wherein, described some windings are rotating around outside aluminum matter pipeline, 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.

5. use the defecator pressing down ripple, magnetizing and adsorb as claimed in claim 1, it is characterized in that: described adsorption module specifically uses homopolarity adjacent type absorbing ring, this homopolarity adjacent type absorbing ring to include 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. use the defecator pressing down ripple, magnetizing and adsorb as claimed in claim 1, it is characterized in that: described adsorption module specifically 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. use the defecator pressing down ripple, magnetizing and adsorb as claimed in claim 1, it is characterised in that: the bottom of described oil returning tube is provided with an overflow valve, is provided with an automatically controlled set screw bottom this overflow valve；Described overflow valve is provided with an oil drain out, and this oil drain out is connected to a fuel tank by pipeline.

8. use the defecator pressing down ripple, magnetizing and adsorb as claimed in claim 1, it is characterised in that: the bottom of described inner core is 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.

9. use the defecator pressing down ripple, magnetizing and adsorb as claimed in claim 1, it is characterised in that: the center upright of described inner core 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.

10. use the defecator pressing down ripple, magnetizing and adsorb as claimed in claim 1, it is characterised in that: the precision of described filter element is 1-5 micron.