CN105864226A - Filter adopting full frequency band variable structure working condition self-adaptive filtration waves, adsorption and magnetic fields - Google Patents

Abstract

The invention relates to a filter adopting full frequency band variable structure working condition self-adaptive filtration waves, adsorption and magnetic fields. A filter body, a U-shaped particle separation module, an oil return barrel and an outer barrel of the filter are sequentially arranged on a bottom plate. The filter body is connected with the U-shaped particle separation module and is a full frequency band variable structure working condition self-adaptive filter body. The U-shaped particle separation module comprises a U-shaped pipe. A temperature control module, a magnetization module, a first adsorption module, a rotating magnetic field centrifugal module, a second adsorption module and a degaussing module are sequentially installed on the U-shaped pipe. The U-shaped particle separation module is connected with the upper portion of the oil return barrel through an oil return barrel oil inlet pipe. 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 inner barrel oil inlet pipe. The inner barrel oil inlet pipe is located in the oil return barrel oil inlet pipe. A filter element is arranged on the inner wall of the inner barrel. The filter adopting the full frequency band variable structure working condition self-adaptive filtration waves, adsorption and the magnetic fields has the advantages of being good in filtering performance, high in adaptability and integration, long in service life and the like.

Description

With full frequency band structure changes operating mode adaptive-filtering, absorption and the filter in magnetic field

[technical field]

The present invention relates to a kind of hydraulic oil filter, be specifically related to one full frequency band structure changes operating mode adaptive-filtering, Absorption and the filter in magnetic field, belong 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 (1) all kinds of Hydraulic Elements are to fluid Cleannes require different, the size of the solid particle in fluid is the most different, for this need in hydraulic system Diverse location install multiple dissimilar wave filter, thus bring cost and install complexity problem；(2) hydraulic system In filter mainly use cake filtration mode, during filtration filtrate be perpendicular to filter element surface flowing, trapped solid Microgranule forms filter cake progressive additive, and the rate of filtration is gradually reduced the most therewith until filtrate stops flowing out, and reduces filter element Service life.

Therefore, for solving above-mentioned technical problem, the use full frequency band structure changes operating mode of a kind of innovation of necessary offer is adaptive Should filter, adsorb and the filter in magnetic field, 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 with full frequency band structure changes operating mode adaptive-filtering, absorption and the filter in magnetic field.

For achieving the above object, the technical scheme that the present invention takes is: with full frequency band structure changes operating mode adaptive-filtering, suction Echo the filter in magnetic field, it 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 filter Ripple device includes input pipe, shell, outlet tube, corrugated tube and S type elastic thin-wall；Wherein, described input pipe is connected to shell One end, itself and hydraulic oil inlet docking；Described outlet tube is connected to the other end of shell, itself and U-shaped separation of particles module pair Connect；Described S type elastic thin-wall is installed in shell along the radial direction of shell, forms expansion chamber and contraction chamber in it；Described input pipe, Outlet tube and S type elastic thin-wall are collectively forming a S type cavity volume wave filter；Cylinder is formed between described S type elastic thin-wall and shell The resonance cavity volume of shape；Uniformly having some taper structure changes damping holes in the axial direction of described S type elastic thin-wall, taper structure changes hinders Buddhist nun hole connection resonance cavity volume；Described taper structure changes damping hole is made up of cone shaped elastic damping hole pipe and slot apertures；Described corrugated tube It is wound in the shape of a spiral outside resonance cavity volume, inserts pipe with resonance cavity volume by multiple tapers and connect；Described corrugated tube is logical between respectively enclosing Crossing the connection of some arms, arm is provided with switch；Described corrugated tube and resonance cavity volume composition plug-in type spiral isomery cascaded H type filter Ripple device；Described U-shaped separation of particles module includes a U-tube, and U-tube is sequentially installed with temperature control module, magnetized module, the first suction Attached module, rotating excitation field are centrifuged module, the second adsorption module and demagnetization module；Described U-shaped separation of particles module and oil returning tube Top by one oil returning tube oil inlet pipe connect；Described inner core is placed in outer barrel, if it is installed by a top board and bolt stem On end cap；Described helical flow path is contained in inner core, between itself and U-shaped separation of particles module by an inner core oil inlet pipe even Connect；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 be coaxially disposed with oil returning tube oil inlet pipe；Described filter element is arranged on the inwall of inner core, and its precision is 1-5 micron；The bottom of said tub is provided with a hydraulic oil oil-out.

The filter with full frequency band structure changes operating mode adaptive-filtering, absorption and magnetic field of the present invention is further arranged to: The axis of described input pipe and outlet tube is the most on the same axis；The wider place of described taper structure changes damping hole opening is positioned at resonance In cavity volume, its taper angle is 10 °；The Young's modulus of described taper structure changes damping hole cone shaped elastic damping hole pipe compares elastic thin-wall Young's modulus want big, can be with change in fluid pressure stretching or compression；The Young's modulus of slot apertures is than cone shaped elastic damping hole pipe Young's modulus wants big, can be with fluid opened by pressure or closedown；Described taper is inserted the wider place of tube opening and is positioned at corrugated tube, its cone Degree angle is 10 °.

The filter with full frequency band structure changes operating mode adaptive-filtering, absorption and magnetic field of the present invention is further arranged to: Described temperature control module includes heater, cooler and temperature sensor；Described heater uses the Chongqing gold letter of band temperature detection Lubricating oil heater；Remover for surface evaporation type air cooling selected by described cooler, and the finned tube of cooler selects KLM type finned tube；Temperature Degree sensor uses platinum resistance temperature sensor.

The filter with full frequency band structure changes operating mode adaptive-filtering, absorption and magnetic field of the present invention 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 rotating around outside aluminum matter pipeline, and each winding is made up of positive winding and inverse winding；Described iron shell is coated on 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 filter with full frequency band structure changes operating mode adaptive-filtering, absorption and magnetic field of the present invention is further arranged to: Described first adsorption module and the second adsorption module all use homopolarity adjacent type absorbing ring, this homopolarity adjacent type absorbing ring to include aluminum Matter circulating line, forward solenoid, reverse solenoid and irony magnetic conduction cap；Described forward solenoid and reverse solenoid are respectively Being arranged in aluminium ring shape pipeline, 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 with reverse Solenoid adjacent and forward solenoid and the intermediate point of reverse solenoid axis.

The filter with full frequency band structure changes operating mode adaptive-filtering, absorption and magnetic field of the present invention is further arranged to: Described first adsorption module and the second adsorption module all use the homopolarity adjacent type absorbing ring of charged hammer, this charged hammer same The most adjacent type absorbing ring include aluminium ring shape pipeline, forward solenoid, reverse solenoid, irony magnetic conduction cap, dividing plate, electric shock hammer with And electric magnet；Described forward solenoid and reverse solenoid are respectively arranged in aluminium ring shape pipeline, and both are connected with in opposite direction Electric current so that forward solenoid and reverse solenoid adjacent produce like pole；Described irony magnetic conduction cap is arranged in aluminum matter On the inwall of circulating line, it is positioned at forward solenoid and reverse solenoid adjacent and forward solenoid and reverse helical The intermediate point of pipe axis；Described dividing plate is between forward solenoid and reverse solenoid；Described electric shock hammer and electric magnet are positioned at 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 filter with full frequency band structure changes operating mode adaptive-filtering, absorption and magnetic field of the present invention is further arranged to: Described rotating excitation field is centrifuged module and includes aluminum matter pipeline, iron shell, three-phase symmetric winding, flange and three-phase symmetrical current-mode Block；Described three-phase symmetric winding is wound on outside aluminum matter pipeline；Described iron shell is coated on aluminum matter pipeline；Described flange welding exists The two ends of aluminum matter pipeline；Described three-phase symmetrical current module connects described three-phase symmetric winding.

The filter with full frequency band structure changes operating mode adaptive-filtering, absorption and magnetic field of the present invention is further arranged to: 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 One oil drain out, this oil drain out is connected to a fuel tank by pipeline.

The filter with full frequency band structure changes operating mode adaptive-filtering, absorption and magnetic field of the present invention is further arranged to: 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 electricity Control check-valves.

The filter with full frequency band structure changes operating mode adaptive-filtering, absorption and magnetic field of the present invention is also configured to: described The center upright of inner core is provided with a hollow cylinder, hollow cylinder be arranged over pressure difference indicator, this pressure difference indicator is installed on On end cap；Described inner core oil inlet pipe and the tangent connection of helical flow path.

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 is that the structure with the filter in full frequency band structure changes operating mode adaptive-filtering, absorption and magnetic field of the present invention is shown It is intended to.

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

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

Fig. 4 is the H mode filter frequency characteristic constitutional diagram of single H mode filter and series connection.Wherein, solid line is single H mode filter frequency characteristic.

Fig. 5 is the structural representation of S type cavity volume wave filter.

Fig. 6 is the cross sectional representation of S type elastic thin-wall.

Fig. 7 is the schematic diagram of taper structure changes damping hole in Fig. 3.

Fig. 7 (a) to Fig. 7 (c) is the working state figure of taper structure changes damping hole.

Fig. 8 is the schematic diagram of the U-shaped separation of particles module in Fig. 1.

Fig. 9 is the structural representation of the magnetized module in Fig. 8.

Figure 10 is the structural representation of the winding in Fig. 9.

Figure 11 is the circuit diagram of the magnetizing current output module in Fig. 9.

Figure 12 is the structural representation that the first adsorption module (the second adsorption module) is homopolarity adjacent type absorbing ring of Fig. 8.

Figure 13 is the homopolarity adjacent type absorbing ring that the first adsorption module (the second adsorption module) is charged hammer in Fig. 8 Structural representation.

Figure 14 is the structural representation that the rotating excitation field in Fig. 8 is centrifuged module.

[detailed description of the invention]

Referring to shown in Figure of description 1 to accompanying drawing 14, the present invention is the filter of one full frequency band structure changes operating mode self adaptation The filter in ripple, absorption and magnetic field, it is by base plate 6, wave filter 8, U-shaped separation of particles module 3, oil returning tube 7, inner core 15, spiral Several parts compositions such as runner 17, filter element 18, outer barrel 19 and end cap 25.Wherein, described wave filter 8, U-shaped separation of particles module 2, Oil returning tube 7, outer barrel 19 are sequentially 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 88, outlet tube 89, corrugated tube 83 and S type Thin Elastic Several parts compositions such as wall 87.

Wherein, described input pipe 81 is connected to one end of shell 89, and itself and a hydraulic oil inlet 1 are docked；Described outlet tube 811 other ends being connected to shell 89, itself and U-shaped separation of particles module 3 are docked.Described S type elastic thin-wall 87 is along the footpath of shell In being installed on shell 88, in it, form expansion chamber 71 and contraction chamber 72.The axis of described input pipe 81 and outlet tube 89 does not exists On same axis, so can improve the filter effect of more than 10%.

Described input pipe 81, outlet tube 89 and S type elastic thin-wall 87 are collectively forming a S type cavity volume wave filter, thus decay Hydraulic system high frequency pressure pulsations.The filter transmission coefficient obtained after processing by lumped-parameter method is:

$\mathrm{\γ}=\frac{1}{1+{(\frac{2\mathrm{\π}f}{Z}\·\frac{\frac{2}{3}{k}_1{D}^3+k_2{d}^{2}L}{{d_I}^2\·a})}^2}$

Velocity of sound L contraction chamber length D expansion chamber diameter Z characteristic impedance in a medium

γ transmission coefficient f pressure oscillation frequency d_IInput pipe diameter d contraction chamber diameter

k₁Expansion chamber coefficient k₂Contraction chamber coefficient

From above formula, S type cavity volume wave filter is similar with the electric capacity effect in circuit.The pressure pulse wave of different frequency leads to When crossing this wave filter, transmission coefficient is different with frequency.Frequency is the highest, then transmission coefficient is the least, and this shows the pressure arteries and veins of high frequency Dynamic ripple is decayed the most severe when device after filtering, thus serves the effect eliminating high frequency pressure pulsations.Meanwhile, the present invention In S type holding cavity structure, transitions smooth between expansion chamber and contraction chamber, contribute to reducing the system pressure that cavity diameter sudden change brings Loss.

The design principle of described S type cavity volume wave filter is as follows: when the flow of change enters the swollen of S type cavity volume by input pipe During swollen chamber, liquid stream exceedes average discharge, and the expansion chamber of expansion can absorb unnecessary liquid stream, and releases liquid when less than average discharge Stream, thus absorption pressure pulsation energy.The combination of multiple expansion chamber and contraction chamber then improves the fluctuation pressure of wave filter and absorbs Ability, namely filtering performance.Use curved surface to smoothly transit between expansion chamber and contraction chamber, then avoid by fluid boundary sudden change band That comes loses along stroke pressure and heating.

Described S type elastic thin-wall 87 weakens hydraulic system medium-high frequency pressure fluctuation by being forced to mechanical vibration.By lump The S type elastic thin-wall natural frequency that parametric 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 S type elastic thin-walled structures coefficient h S type elastic thin-wall thickness R S type elastic thin-wall radius

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

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

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

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

Further, the resonance cavity volume 85 of cylinder is formed between described S type elastic thin-wall 87 and shell 88.Described S type Some taper structure changes damping holes 86 are uniformly had in the axial direction of elastic thin-wall 87, equal to ensure in the range of whole wave filter Plug-in type connection in series-parallel filtering can be realized.Taper structure changes damping hole 86 connection resonance cavity volume 85.Described taper structure changes damping hole The wider place of opening is positioned at resonance cavity volume, and its taper angle is 10 °, for broadening frequency filtering scope, processes by lumped-parameter method After the wave filter natural angular frequency that obtains be:

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

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

Described corrugated tube 83 is wound on outside resonance cavity volume 85 in the shape of a spiral, and resonance cavity volume 85 inserts pipe 82 by multiple tapers Connection.Described taper insert the wider place of pipe 82 opening be positioned at corrugated tube 83, its taper angle be 10 ° for broadening frequency filtering model Enclose.Described corrugated tube 83 is connected by some arms 810 between respectively enclosing, and arm 810 is provided with switch 84.Described corrugated tube 83 He Resonance cavity volume 85 forms plug-in type spiral isomery cascaded H mode filter.

From the figure 3, it may be seen that cascaded H mode filter has 2 natural angular frequencies, at crest, filter effect is preferable, and at trough Place does not has filter effect the most substantially；The corrugated tube 83 that have employed spiral isomery in plug-in type spiral isomery cascaded H mode filter is tied Structure, corrugated tube itself has elasticity, when flow and the pressure fluctuation of hydraulic system cause liquid through corrugated tube, fluid media (medium) Pressure-spring system vibrates, and offsets Wave energy, thus plays filter action；Meanwhile, the some arms between each circle corrugated tube 83 The connection of 810 or disconnection, cause interference and the superposition of ripple, thus change the frequency characteristic of cascaded H mode filter；Reasonable arrangement is filtered Ripple device parameter and the connection quantity of arm and position, can make the trough of the frequency characteristic of cascaded H mode filter raise, make filtering Device has good filtering performance at whole medium and low frequency Duan Jun, it is achieved the entire spectrum filtering of medium and low frequency section.

Further, described taper structure changes damping hole 86 is made up of cone shaped elastic damping hole pipe 16 and slot apertures 15, taper Narrow end is opened on elastic thin-wall 7.Wherein the Young's modulus of cone shaped elastic damping hole pipe 16 is wanted than the Young's modulus of elastic thin-wall 7 Greatly, can be with change in fluid pressure stretching or compression；The Young's modulus of slot apertures 15 is than the Young's modulus of cone shaped elastic damping hole pipe 16 Want big, can be with fluid opened by pressure or closedown.Therefore when the fluctuating frequency of pressure falls at high band, S type cavity volume filter construction rises Filter action, cone shaped elastic damping hole pipe 16 and slot apertures 15 are all in Fig. 7 (a) state；And when ripple frequency falls at Mid Frequency, Filter construction becomes S type cavity volume filter construction and elastic thin-wall 7 filter structure concurs, cone shaped elastic damping hole pipe 16 and slot apertures 15 all in Fig. 7 (a) state；When ripple frequency falls at some specific Frequency, filter construction becomes Plug-in type connection in series-parallel H mode filter, S 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 Fig. 7 (b) state, owing to the natural frequency of plug-in type connection in series-parallel H mode filter is designed For consistent with these particular low frequency ripple frequencies, the system that fundamental frequency energy is big can be played preferable filter effect；When pulsation frequency Rate fall the low-frequency range beyond some characteristic frequency time, cone shaped elastic damping hole pipe 16 and slot apertures 15 are all in Fig. 7 (c) state. The design of such structure changes wave filter both ensure that the full frequency band full working scope filtering of hydraulic system, reduces again and filters under nominal situation The pressure loss of ripple device, it is ensured that the hydraulic pressure rigidity of system.

This wave filter 8 can also the pulsation decay of solid line operating mode self-adaptive pressure.When hydraulic system working conditions change, both performed unit Part stops suddenly or runs, and when the opening of valve changes, the characteristic impedance of pipe-line system can be caused to undergo mutation, so that former Pipeline pressure curve with change in location in time changes the most therewith, then the position of pressure peak also changes.Due to this The axial length of bright wave filter is designed as more than system main pressure pulsation wavelength, and the plug-in type spiral isomery string of wave filter The connection cavity volume length of H mode filter, the length of S 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；Plug-in type spiral isomery cascaded H type filters The taper structure changes damping hole of device is opened on S type elastic thin-wall, is uniformly distributed in the axial direction, the corrugated tube that spiral isomery is wound around With the taper between resonance cavity volume inserts pipe and is axially being uniformly distributed so that pressure peak change in location is to the performance of wave filter almost Not impact, it is achieved thereby that operating mode adaptive-filtering function.It is suitable in view of three kinds of filter structure axial dimensions and wave filter, This bigger size also ensure that hydraulic filter possesses stronger pressure fluctuation damping capacity.

This wave filter 8 is used to carry out the method for hydraulic pulsation filtering as follows:

1), hydraulic fluid enters S type cavity volume wave filter by input pipe, and the cavity volume of expansion absorbs unnecessary liquid stream, completes height The filtering of pressure fluctuation frequently；

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

3), by plug-in type spiral isomery cascaded H mode filter, pipe and fluid are inserted in taper structure changes damping hole, taper Produce resonance, consume pulsation energy, complete the filtering of low frequency pulsation；

4), the axial length of wave filter is designed as more than hydraulic system main pressure pulsation wavelength, and plug-in type string is also Connection H mode filter length, Double-pipe plug-in type filter length and S type elastic thin-wall 87 length are equal with filter length, make pressure Power peak is constantly in the effective range of wave filter, it is achieved the filtering of pressure fluctuation when system condition changes；

5), by the flexible of the cone shaped elastic damping hole pipe of taper structure changes damping hole and the switch of slot apertures, pressure is completed Pulsation 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, magnetization Module the 33, first adsorption module 34, rotating excitation field are centrifuged module the 36, second adsorption module 37 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 first 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 aluminium ring shape pipeline 341, both are connected with electric current in opposite direction so that forward solenoid 342 and reverse solenoid 343 are adjacent Place produces 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 helical Pipe 342 and 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, described first adsorption module 34 may be used without the homopolarity adjacent type absorbing ring of charged hammer, and this is charged The homopolarity adjacent type absorbing ring of hammer is by aluminium ring shape pipeline 341, forward solenoid 342, reverse solenoid 343, irony magnetic conduction The parts compositions such as cap 344, dividing plate 345, electric shock hammer 346 and electric magnet 347.Wherein, described forward solenoid 342 and reverse spiral shell Spool 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 anti- Like pole is produced to solenoid 343 adjacent.Described irony magnetic conduction cap 344 is arranged on the inwall of aluminium ring shape pipeline 341, 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 electricity 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 first adsorption module 34 is designed to U-shaped, and when fluid enters U-shaped absorption pipeline, granule is at gravity, centrifugal force Effect under, to side, tube wall moves, and plus magnetic field force effect, moves radially speed and accelerates, and the efficiency of granular absorption is able to Improve；Fluid leave U-shaped absorption pipeline rise time, transport so that the direction that granule is diagonally lower gravity and magnetic field force with joint efforts Dynamic, extend the numerical density time, improve the efficiency of granular absorption.

Described rotating excitation field is centrifuged module 36 and utilizes the centrifugal small magnetic not adsorbed by the first adsorbent equipment 34 of rotating excitation field Changing granule, it is by aluminum matter pipeline 361, iron shell 362, three-phase symmetric winding 363, flange 364 and three-phase symmetrical current-mode Block 365 forms.Described three-phase symmetric winding 363 is wound on outside aluminum matter pipeline 361.Described iron shell 362 is coated on aluminum matter pipeline On 361.Described flange 364 is welded on the two ends of aluminum matter pipeline 361.Described three-phase symmetrical current module 365 connects described three-phase Symmetric winding 363.

The operation principle that described rotating excitation field is centrifuged module 36 is as follows: small magnetization granule not to be adsorbed enters rotary magnetic The centrifugal module 36 in field, three-phase symmetrical current module 365 makes to flow through in three-phase symmetric winding 363 three-phase symmetrical electric current, and this electric current exists Producing rotating excitation field in aluminum matter pipeline 361, magnetized particles is acted on by magnetic field force under rotating excitation field effect, and in this power Spirally advance under effect, simultaneously to vessel wall motion.Therefore, regulation magnetic field intensity can make the granule in fluid from fluid " separate " out, be gathered in aluminum matter pipeline 361 near-wall, it is simple to subsequent adsorbtion captures.

Described second adsorbent equipment 37 is identical with described first adsorbent equipment 34 structure, and function is the most identical with the mechanism of action, It can adsorb rotated magnetic field further and be centrifuged the granule that module 36 separates.

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 8, is provided with an automatically controlled set screw 9 bottom this overflow valve 8；Described Overflow valve 8 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 8, thus realizes solid particle by particle Footpath shunting filtering.Herein, oil returning tube 7 and overflow valve 8 serve aforesaid macrofiltration, thus save filter number, fall Low system cost and complexity.The automatically controlled set screw 9 of overflow valve 8 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), backflow force feed enters the temperature control module 32 of U-shaped separation of particles module 3, regulates oil temperature by temperature control module 32 To optimal magnetization temperature 40-50 DEG C, enter magnetized module 33 afterwards；

3), by magnetized module 33, oil return is magnetized, make micron-sized metallic particles aggregate into bulky grain, send afterwards To the first adsorption module 34；

4), adsorbed the magnetic polymeric microgranule in oil return by the first adsorption module 34, oil return afterwards deliver to rotating excitation field from Core module 36；

5), rotating excitation field is centrifuged module 36 and utilizes rotating excitation field to separate unadsorbed magnetic microparticles, and oil return afterwards delivers to the Two adsorption modules 37；

6), the magnetic polymeric microgranule in the second adsorption module 37 second adsorption oil return；

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

8) after, the fluid of the most U-shaped separation of particles module 3 near-wall enters oil returning tube 7 by oil returning tube oil inlet pipe 22 Being back 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 to be carried out High-precision filtration；

9), 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；

10), 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. with full frequency band structure changes operating mode adaptive-filtering, absorption and the filter in magnetic field, it is characterised in that: include base plate, filter Ripple device, 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 Type separation of particles module, oil returning tube, outer barrel are sequentially placed on base plate；Described wave filter includes input pipe, shell, outlet tube, ripple Stricture of vagina pipe and S type elastic thin-wall；Wherein, described input pipe is connected to one end of shell, itself and hydraulic oil inlet docking；Described Outlet tube is connected to the other end of shell, and itself and U-shaped separation of particles module are docked；Described S type elastic thin-wall is along the radial direction of shell It is installed in shell, in it, forms expansion chamber and contraction chamber；Described input pipe, outlet tube and S type elastic thin-wall are collectively forming a S Type cavity volume wave filter；The resonance cavity volume of cylinder is formed between described S type elastic thin-wall and shell；Described S type elastic thin-wall Some taper structure changes damping holes, taper structure changes damping hole connection resonance cavity volume is uniformly had on Zhou Xiang；Described taper becomes knot Structure damping hole is made up of cone shaped elastic damping hole pipe and slot apertures；Described corrugated tube is wound on outside resonance cavity volume in the shape of a spiral, and resonance Cavity volume inserts pipe by multiple tapers and connects；Described corrugated tube is connected by some arms between respectively enclosing, and arm is provided with switch； Described corrugated tube and resonance cavity volume composition plug-in type spiral isomery cascaded H mode filter；Described U-shaped separation of particles module includes one U-tube, U-tube is sequentially installed with temperature control module, magnetized module, the first adsorption module, rotating excitation field are centrifuged module, second inhale 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, and its precision is 1-5 micron；The bottom of said tub is provided with a hydraulic pressure Oil oil-out.

2. as claimed in claim 1 by full frequency band structure changes operating mode adaptive-filtering, absorption and the filter in magnetic field, its feature It is: the axis of described input pipe and outlet tube is the most on the same axis；Position, described taper structure changes damping hole opening wider place In resonance cavity volume, its taper angle is 10 °；The Young's modulus of described taper structure changes damping hole cone shaped elastic damping hole pipe compares bullet Property thin-walled Young's modulus want big, can be with change in fluid pressure stretching or compression；The Young's modulus of slot apertures damps than cone shaped elastic The Young's modulus of hole pipe wants big, can be with fluid opened by pressure or closedown；Described taper is inserted the wider place of tube opening and is positioned at corrugated tube In, its taper angle is 10 °.

3. as claimed in claim 1 by full frequency band structure changes operating mode adaptive-filtering, absorption and the filter in magnetic field, its feature It is: described temperature control module includes heater, cooler and temperature sensor；Described heater uses the Chongqing of band temperature detection The lubricating oil heater of Jin Hong；Remover for surface evaporation type air cooling selected by described cooler, and the finned tube of cooler selects KLM type fin Pipe；Temperature sensor uses platinum resistance temperature sensor.

4. as claimed in claim 1 by full frequency band structure changes operating mode adaptive-filtering, absorption and the filter in magnetic field, its feature It is: 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 bag It is overlying 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. as claimed in claim 1 by full frequency band structure changes operating mode adaptive-filtering, absorption and the filter in magnetic field, its feature It is: described first adsorption module and the second adsorption module all use homopolarity adjacent type absorbing ring, this homopolarity adjacent type absorbing ring Including aluminium ring shape pipeline, forward solenoid, reverse solenoid and irony magnetic conduction cap；Described forward solenoid and reverse helical Pipe is 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 produces like pole；Described irony magnetic conduction cap is arranged on the inwall of aluminium ring shape pipeline, and it is positioned at forward solenoid With reverse solenoid adjacent and forward solenoid and the intermediate point of reverse solenoid axis.

6. as claimed in claim 1 by full frequency band structure changes operating mode adaptive-filtering, absorption and the filter in magnetic field, its feature Being: described first adsorption module and the second adsorption module all use the homopolarity adjacent type absorbing ring of charged hammer, this band shocks by electricity The homopolarity adjacent type absorbing ring of hammer includes aluminium ring shape pipeline, forward solenoid, reverse solenoid, irony magnetic conduction cap, dividing plate, electricity Hammer and electric magnet；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；Described dividing plate is between forward solenoid and reverse solenoid；Described electric shock hammer and electromagnetism Ferrum is 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 full frequency band structure changes operating mode adaptive-filtering, absorption and the filter in magnetic field described in claim 1, its feature exists In: described rotating excitation field is centrifuged module and includes aluminum matter pipeline, iron shell, three-phase symmetric winding, flange and three-phase symmetrical electricity Flow module；Described three-phase symmetric winding is wound on outside aluminum matter pipeline；Described iron shell is coated on aluminum matter pipeline；Described flange welds It is connected on the two ends of aluminum matter pipeline；Described three-phase symmetrical current module connects described three-phase symmetric winding.

8. use full frequency band structure changes operating mode adaptive-filtering, absorption and the filter in magnetic field described in claim 1, its feature exists In: 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；Set on described overflow valve Having an oil drain out, this oil drain out is connected to a fuel tank by pipeline.

9. use full frequency band structure changes operating mode adaptive-filtering, absorption and the filter in magnetic field described in claim 1, its feature exists In: 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 one Automatically controlled check-valves.

10. use full frequency band structure changes operating mode adaptive-filtering, absorption and the filter in magnetic field, its feature described in claim 1 Be: the center upright of described inner core is provided with a hollow cylinder, hollow cylinder be arranged over pressure difference indicator, this pressure reduction indicate Device is installed on end cap；Described inner core oil inlet pipe and the tangent connection of helical flow path.