CN105864189A - Hydraulic wave filtering method for full-band variable structure - Google Patents

Hydraulic wave filtering method for full-band variable structure Download PDF

Info

Publication number
CN105864189A
CN105864189A CN201610311918.7A CN201610311918A CN105864189A CN 105864189 A CN105864189 A CN 105864189A CN 201610311918 A CN201610311918 A CN 201610311918A CN 105864189 A CN105864189 A CN 105864189A
Authority
CN
China
Prior art keywords
cavity volume
filter
structure changes
hydraulic
damping hole
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
CN201610311918.7A
Other languages
Chinese (zh)
Inventor
顾巍
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
University of Shaoxing
Original Assignee
University of Shaoxing
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by University of Shaoxing filed Critical University of Shaoxing
Priority to CN201610311918.7A priority Critical patent/CN105864189A/en
Publication of CN105864189A publication Critical patent/CN105864189A/en
Withdrawn legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
    • F15B21/008—Reduction of noise or vibration
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
    • F15B21/04—Special measures taken in connection with the properties of the fluid
    • F15B21/048—Arrangements for compressed air preparation, e.g. comprising air driers, air condensers, filters, lubricators or pressure regulators

Abstract

The invention relates to a hydraulic wave filtering method for a full-band variable structure. According to the hydraulic wave filtering method, the high-frequency pressure pulsation of a hydraulic system is dampened by adopting an S-shaped cavity wave filter and weakened by utilizing the forced mechanical vibration of an elastic thin wall; the wave filtering effect of a series-parallel H-shaped wave filter group on the pressure pulsation at mid- and low-frequency bands is relatively good; and accordingly, full-band pressure pulsation wave filtering can be realized. The hydraulic wave filtering method has the advantages that the axial length of the wave filter is designed to be greater than the pressure pulsation wave length; and three wave filtering structures in the wave filter have the same pressure pulsation dampening effect within the axial length range, so that the wave filter can possess the working condition self-adaptive capability; the three wave filtering structures have the same axial dimensions with the wave filter, and the wave filtering performance of the hydraulic wave filter can be guaranteed due to such relatively large axial dimensions; and the pressure pulsation is automatically adaptive and the structure of the wave filter is changed with pressure, so that the wave filtering pressure loss can be reduced and the impact of wave filtering on the hydraulic stiffness can be lowered.

Description

A kind of Hydraulic filtration method of full frequency band structure changes
[technical field]
The present invention relates to a kind of Hydraulic filtration device, be specifically related to a kind of full frequency band structure changes Hydraulic filtration method, belong to technical field of hydraulic equipment.
[background technology]
Hydraulic system has the features such as big, the good operation stability of power density, leads in engineering It is used widely in territory.Along with hydraulic technique is to high pressure, high speed and big direction of the traffic development, The impact of pressure fluctuation intrinsic in hydraulic system becomes increasingly conspicuous.Correlational study shows, when When amplitude of pressure fluctuation exceedes the 10% of hydraulic system working pressure, pipeline will be formed higher Pressure and cause pipe-line system to be destroyed；When amplitude of pressure fluctuation exceedes hydraulic work system Pressure 2～10% time, generation is worn and torn, is jeopardized whole hydraulic system by pipeline and valve Reliability.
Pressure fluctuation is produced by system impedance by flow pulsation, and flow pulsation rises Coming from the pulsation of the flow of the output of hydraulic pump, eliminating pressure fluctuation at hydraulic pump is liquid Filter pressing ripple most straightforward approach.Chinese scholars has carried out much research to this, although adopt Take many corrective measures, but because of the constraint of hydraulic pump periodically oil extraction mechanism, eradicate Flow pulsation is impossible.Except considering how attenuating pulsation from source, it is also possible to from The angle of system load considers, installs hydraulic filter additional and can reduce system on pipeline Input impedance (i.e. reducing the output impedance of pump) also can increase the decay to pressure fluctuation And absorption.
Hydraulic filter is to go out to send decay pressure fluctuation, from the mechanism of action from load system On can be divided into resistive filtering and resistance filtering two big classes.Resistance filtering principle is to utilize impedance Mismatch, makes pressure wave reflect up to the purpose of filtering in the interface of change in the instantaneous impedance. But current resistance wave filter also exists following deficiency: the pressure fluctuation in (1) conduit under fluid pressure Being the function of time and position, the hydraulic filter of location and installation cannot adapt to variable working condition feelings Condition；(2) characteristic frequency point and narrow frequency range are only just had and well filter effect by resistance wave filter Really, it is impossible to realize wide spectrum filtering；(3) hydraulic filter is to the attenuating of pressure fluctuation not Enough ideals；(4) flow pulsation do not had filter action.
For solving the problems referred to above, patent documentation 1 (Chinese invention patent application, publication number CN101614231) disclosing a kind of hydraulic system vibration-damping dissipative muffler, its structure is expansion Cavate vibroshock, equipped with the mass body of different quality, quality on the resonance that is fixedly connected leaf spring Damping hole, so the resonance leaf spring with different quality body is had to form " matter with damping hole on body Amount+spring+damping " lumped parameter formula coupling spring vibrational system, thus reach wide spectrum filter Ripple effect.Each filtering on the filter effect of the damping muffler of this patent and elastic sheet Radius and the thickness of unit are closely related, owing to being provided with multiple filtering on elastic sheet Unit is to realize wide spectrum filtering, and the radius of each unit and thickness are restricted, therefore Filter effect is impacted；The damping muffler of this patent does not solve pressure arteries and veins simultaneously The dynamic problem with change in location, not good enough to the adaptability of variable working condition situation.
Therefore, for solving above-mentioned technical problem, the full range of a kind of innovation of necessary offer The Hydraulic filtration method of section structure changes, 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 full frequency band and become The Hydraulic filtration method of structure, its high, medium and low frequency range that can decay in hydraulic system Fluctuation pressure, thus play full frequency band operating mode adaptive-filtering effect.
For achieving the above object, the technical scheme that the present invention takes is: a kind of full frequency band becomes The Hydraulic filtration method of structure, it uses a kind of filter, this device include input pipe, Shell, outlet tube, S type elastic thin-wall, H mode filter and cascaded H mode filter； Wherein, described input pipe is connected to one end of shell；Described outlet tube is connected to shell The other end；Described S type elastic thin-wall is installed in shell along the radial direction of shell, shape in it Become expansion chamber and contraction chamber；Described input pipe, outlet tube and the common shape of S type elastic thin-wall Become a S type cavity volume wave filter；Uniformly have some in the axial direction of described S type elastic thin-wall Taper structure changes damping hole；Resonance series is formed between described S type elastic thin-wall and shell Cavity volume I and parallel resonance cavity volume；The outside of described resonance series cavity volume I sets a series connection Resonance cavity volume II, by one between described resonance series cavity volume I and resonance series cavity volume II Pipe connection is inserted in taper；Described H mode filter is positioned at parallel resonance cavity volume, itself and cone Deformation structure damping hole is connected；Described cascaded H mode filter is positioned at resonance series cavity volume In I and resonance series cavity volume II, 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；
It includes following method:
1), hydraulic fluid enters S type cavity volume wave filter, the cavity volume of expansion by input pipe Absorb unnecessary liquid stream, complete the filtering of high frequency pressure pulsations；
2), by S type elastic thin-wall forced vibration, the pressure fluctuation energy of fluid is consumed, Complete the filtering of intermediate frequency pressure fluctuation；
3), by connection in series-parallel H mode filter group, and taper structure changes damping hole, cone Shape inserts pipe and fluid produces resonance, consumes pulsation energy, completes low frequency pulsation Filtering；
4), by the flexible of the cone shaped elastic damping hole pipe of taper structure changes damping hole and seam The switch in hole, completes pressure fluctuation adaptive-filtering.
The Hydraulic filtration method of the full frequency band structure changes of the present invention is further arranged to: described The axis of input pipe and outlet tube is the most on the same axis.
The Hydraulic filtration method of the full frequency band structure changes of the present invention is further arranged to: described The wider place of taper structure changes damping hole opening is positioned at resonance series cavity volume I and parallel resonance is held Intracavity, its taper angle is 10 °；Described taper structure changes damping hole cone shaped elastic damping hole The Young's modulus of pipe is bigger than the Young's modulus of elastic thin-wall, can draw with change in fluid pressure Stretch or compress；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.
The Hydraulic filtration method of the full frequency band structure changes of the present invention is also configured to: described taper Inserting the wider place of tube opening and be positioned at resonance series cavity volume II, its taper angle is 10 °.
Compared with prior art, there is advantages that
1, the present invention has the connection in series-parallel H mode filter group of different natural frequencies, in Smooth attenuation band is defined in the range of low frequency vibration frequency；Cascaded H type filters Separated by elastic thin-wall between two resonance cavity volumes of device, widened its attenuation band width； The resonance cavity volume of wave filter is across whole sef-adapting filter, it is hereby achieved that bigger Resonance cavity volume volume, strengthens attenuating；Taper structure changes damping hole and taper resonantron Taper angle be 10 °, broadening frequency filtering scope.
2, the pressure pulse wave of high frequency is had well by the S type cavity volume wave filter of the present invention Attenuating, transitions smooth between expansion chamber and contraction chamber, reduce cavity diameter sudden change The system pressure loss brought, the input pipe of wave filter and outlet tube the most on the same axis, Improve the filter effect of more than 10%.
3, the taper structure changes damping hole of the present invention is to different ripple frequencies and the stream of amplitude Body pressure can make wave filter change structure, both ensure that the full frequency band full working scope of hydraulic system Filtering, reduces again the pressure loss of wave filter under nominal situation, it is ensured that the liquid of system Pressure rigidity.
4, the axial length of the wave filter of the present invention is designed to more than pressure fluctuation wavelength, The axial direction of S type elastic thin-wall uniformly has the taper structure changes resistance of multiple identical parameters Buddhist nun hole, it is ensured that three kinds of filter structures in wave filter have one in axial length range The pressure fluctuation attenuating caused, makes wave filter possess operating mode adaptive ability.Three kinds of filters Wave structure axial dimension is consistent with wave filter, and its bigger size also ensure that Hydraulic filtration The filtering performance of device.
5, the connection in series-parallel H mode filter group of the present invention, S type cavity volume wave filter, elasticity Thin-walled and taper structure changes damping hole are incorporated into an entirety, make wave filter possess Full frequency band self-adaptive pressure structure changes ripple filtering performance.
[accompanying drawing explanation]
Fig. 1 is the structural representation of the Hydraulic filtration device of the full frequency band structure changes of the present invention Figure.
Fig. 2 is the profile in Fig. 1 along A-A.
Fig. 3 is H mode filter schematic diagram in Fig. 2.
Fig. 4 is cascaded H mode filter schematic diagram in Fig. 2.
Fig. 5 is H mode filter and cascaded H mode filter frequency characteristic constitutional diagram.Wherein, Solid line is cascaded H mode filter frequency characteristic.
Fig. 6 is connection in series-parallel H mode filter frequency characteristic figure.
Fig. 7 is the structural representation of S type cavity volume wave filter.
Fig. 8 is the cross sectional representation of S type elastic thin-wall.
Fig. 9 is the schematic diagram of taper structure changes damping hole in Fig. 2.
Fig. 9 (a) to Fig. 9 (c) is the working state figure of taper structure changes damping hole.
[detailed description of the invention]
Referring to shown in Figure of description 1 to accompanying drawing 9, the present invention is that a kind of full frequency band becomes The Hydraulic filtration device of structure, it is by input pipe 1, shell 8, outlet tube 9, S type bullet Property several parts composition such as thin-walled 7, H mode filter 12 and cascaded H mode filter 13.
Wherein, described input pipe 1 is connected to one end of shell 8；Described outlet tube 9 is even It is connected to the other end of shell 8.Described S type elastic thin-wall 7 is installed on along the radial direction of shell In shell 8, in it, form expansion chamber 71 and contraction chamber 72.Described input pipe 1 and defeated Go out the axis of pipe 9 the most on the same axis, so can improve the filtering effect of more than 10% Really.
Described input pipe 1, outlet tube 9 and S type elastic thin-wall 7 are collectively forming a S type Cavity volume wave filter, thus hydraulic system high frequency pressure pulsations of decaying.At lumped-parameter method The filter transmission coefficient obtained after reason is:
γ = 1 1 + ( 2 π f Z · 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 in a medium Characteristic impedance
γ transmission coefficient f pressure oscillation frequency dIInput pipe diameter d receives Contracting 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.No When the pressure pulse wave of same 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 through filtering Decay the most severe during ripple device, thus serve the effect eliminating high frequency pressure pulsations.With Time, in the S type holding cavity structure of the present invention, transitions smooth between expansion chamber and contraction chamber, Contribute to reducing the system pressure loss that cavity diameter sudden change brings.The input pipe of wave filter With outlet tube the most on the same axis, the filter effect of more than 10% can be improved.
The design principle of described S type cavity volume wave filter is as follows: when the flow of change is by defeated When entering the expansion chamber that pipe enters S type cavity volume, liquid stream exceedes average discharge, the expansion of expansion Chamber can absorb unnecessary liquid stream, and releases liquid stream when less than average discharge, thus absorbs Pressure fluctuation energy.The combination of multiple expansion chamber and contraction chamber then improves the arteries and veins of wave filter Dynamic pressure absorbability, namely filtering performance.Curved surface is used between expansion chamber and contraction chamber Smoothly transit, then avoid and lost along stroke pressure and heating by what fluid boundary sudden change brought.
Described S type elastic thin-wall 7 weakens in hydraulic system high by being forced to mechanical vibration Frequently pressure fluctuation.The S type elastic thin-wall natural frequency obtained after processing by lumped-parameter method For:
f m = k 2 h 2 πR 2 · E 12 ρ ( 1 + η ) ( 1 - 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 quality of the Young's modulus ρ S type elastic thin-wall of E S type elastic thin-wall Density
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 Thin Elastic The natural frequency of wall 7 is generally high than the natural frequency of H mode filter, and its decay frequency Band is also wide than H mode filter.In relatively wide frequency band range, S type elastic thin-wall Pressure fluctuation is had good attenuating.Meanwhile, in the filter construction of the present invention S type elastic thin-wall radius bigger and relatively thin, its natural frequency, can closer to Mid Frequency Realize the effective attenuation to the medium-high frequency pressure fluctuation in hydraulic system.
The design principle of described S type elastic thin-wall 7 is as follows: produce intermediate frequency pressure in pipeline During pulsation, S type cavity volume is more weak to the damping capacity of pressure oscillation, flows into wave filter S type The periodically pulsing pressure continuous action of cavity volume on the inside and outside wall of S type elastic thin-wall 7, Owing to having between inside and outside wall, pillar is fixing to be connected, and inside and outside elastic thin-wall is simultaneously by fluctuation pressure Frequency do periodic vibration, this forced vibration consumes the pressure fluctuation energy of fluid, Thus realize the filtering of Mid Frequency pressure.From the principle of virtual work, elastic thin-wall consumes fluid The potential energy when ability of fluctuation pressure energy and its forced vibration and the direct phase of kinetic energy sum Closing, in order to improve Mid Frequency filtering performance, the radial design of elastic thin-wall is for much larger than pipe Road radius, and the thickness of thin-walled is less, representative value is less than 0.1mm.
Further, resonance series is formed between described S type elastic thin-wall 7 and shell 8 Cavity volume I4 and parallel resonance cavity volume 5.The outside of described resonance series cavity volume I4 sets a string Ally the communists the cavity volume II3 that shakes, logical between described resonance series cavity volume I4 and resonance series cavity volume II3 Crossing a taper insertion pipe 2 to connect, described taper is inserted the wider place of pipe 2 opening and is positioned at series connection In resonance cavity volume II3, its taper angle is 10 °.Described S type elastic thin-wall 7 axial On uniformly have some taper structure changes damping holes 6.
Described H mode filter 12 is positioned at parallel resonance cavity volume 5, and itself and taper become knot Structure damping hole 6 is connected.The wider place of described taper structure changes damping hole 6 opening is positioned at string Allying the communists and shake in cavity volume I4 and parallel resonance cavity volume 5, its taper angle is 10 °.By lump The wave filter natural angular frequency that parametric method obtains after processing is:
ω = a · D 1 D 2 1 L 1 L 2 ( r a d / s )
Velocity of sound L in a medium1The long D of damping hole1Damping hole is straight Footpath
L2Parallel resonance cavity volume height D2Parallel resonance cavity volume diameter.
Described cascaded H mode filter 13 is positioned at resonance series cavity volume I4 and resonance series is held In the II3 of chamber, it is also connected with taper structure changes damping hole 4.At lumped-parameter method After reason, two natural angular frequencies of cascaded H mode filter 13 are:
ω 1 = π a 2 πl 1 ( d 2 2 l 2 + d 4 2 l 4 ) 4 d 1 2 1 + πd 4 2 l 4 l 3 4 d 3 2 + [ πl 1 ( d 2 2 l 2 + d 4 2 l 4 ) 4 d 1 2 1 - πd 4 2 l 4 l 3 4 d 3 2 ] 2 + π 2 d 4 4 l 4 2 l 1 l 3 4 d 1 2 d 3 2
ω 2 = π a 2 πl 1 ( d 2 2 l 2 + d 4 2 l 4 ) 4 d 1 2 1 + πd 4 2 l 4 l 3 4 d 3 2 - [ πl 1 ( d 2 2 l 2 + d 4 2 l 4 ) 4 d 1 2 1 - πd 4 2 l 4 l 3 4 d 3 2 ] 2 + π 2 d 4 4 l 4 2 l 1 l 3 4 d 1 2 d 3 2
Velocity of sound l in a medium1The long d of damping hole1Damping hole diameter l3Altogether Vibration tube is long
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 12 and cascaded H mode filter 13 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 multiple connection in series-parallel H mode filters of the present invention circumferentially interface distributions are (in figure Only depict 2), separate with dividing plate 20 each other, the resonance of these multiple wave filter Frequency band is different, can cover whole medium and low frequency filtering frequency range after combining comprehensively, Realize the entire spectrum filtering of medium and low frequency section.
All can be sent out by Fig. 5 H mode filter and cascaded H mode filter frequency characteristic and formula Existing, cascaded H mode filter has 2 natural angular frequencies, and at crest, filter effect is preferable, The most substantially filter effect is not had at trough；H mode filter has 1 natural angular frequency, At crest, filter effect is preferable equally, does not the most substantially have filter effect at trough； Select suitable filter parameter, make the natural angular frequency of H mode filter just fall at string Between 2 natural angular frequencies of connection H mode filter, as shown in Figure 6, both certain The natural reonant frequency peak value of 3 next-door neighbours is defined, in this frequency range in frequency range In, no matter the fluctuating frequency of pressure is at crest or all can guarantee that preferably filter at trough Ripple effect.Multiple connection in series-parallel H mode filters constitute bank of filters both can cover whole in Low-frequency range, it is achieved the entire spectrum filtering of medium and low frequency section.
Further, described taper structure changes damping hole 6 is by cone shaped elastic damping hole pipe 16 Forming with slot apertures 15, taper narrow end is opened on elastic thin-wall 7.Wherein cone shaped elastic resistance The Young's modulus of Buddhist nun hole pipe 16 is bigger than the Young's modulus of elastic thin-wall 7, can be with fluid pressure Power change stretching or compression；The Young's modulus of slot apertures 15 is than cone shaped elastic damping hole pipe 16 Young's modulus want big, can be with fluid opened by pressure or closedown.Therefore work as the fluctuating frequency of pressure Falling when high band, c-type cavity volume filter construction strobes, and cone shaped elastic damps Hole pipe 16 and slot apertures 15 are all in Fig. 9 (a) state；And when ripple frequency falls at intermediate frequency Duan Shi, filter construction becomes c-type cavity volume filter construction and elastic thin-wall 7 filtering knot Structure concurs, and cone shaped elastic damping hole pipe 16 and slot apertures 15 are all in Fig. 9 (a) State；When ripple frequency falls at some specific Frequency, filter construction becomes Plug-in type connection in series-parallel H mode filter, c-type cavity volume filter construction and elastic thin-wall filtering Structure concurs, and cone shaped elastic damping hole pipe 16 and slot apertures 15 are all in Fig. 9 (b) State, owing to the natural frequency of plug-in type connection in series-parallel H mode filter is designed to and these Particular low frequency ripple frequency is consistent, and the system that fundamental frequency energy is big can play preferably filtering Effect；When ripple frequency falls the low-frequency range beyond some characteristic frequency, cone shaped elastic Damping hole pipe 16 and slot apertures 15 are all in Fig. 9 (c) state.Such structure changes filters Device design both ensure that the full frequency band full working scope filtering of hydraulic system, reduces again normal work The pressure loss of wave filter under condition, 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 operating mode During change, both executive component stopped suddenly or ran, and when the opening of valve changes, meeting The characteristic impedance causing pipe-line system is undergone mutation so that former pipeline pressure in time and The curve of change in location changes the most therewith, then the position of pressure peak also changes.By Axial length in the wave filter of the present invention is designed as more than system main pressure pulsating wave Long, and the cavity volume length of connection in series-parallel H mode filter group of wave filter, the class of S type cavity volume The length of ∏ type resistance 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 The taper structure changes damping hole of connection in series-parallel H mode filter is opened on elastic thin-wall, along axis Direction is uniformly distributed so that pressure peak change in location to the performance of wave filter almost without Impact, it is achieved thereby that operating mode adaptive-filtering function.In view of three kinds of filter structure axles Suitable to size and wave filter, this bigger size also ensure that hydraulic filter possesses Stronger pressure fluctuation damping capacity.
The method that the Hydraulic filtration device using the present invention carries out hydraulic pulsation filtering is as follows:
1), hydraulic fluid enters S type cavity volume wave filter, the cavity volume of expansion by input pipe Absorb unnecessary liquid stream, complete the filtering of high frequency pressure pulsations；
2), by S type elastic thin-wall 7 forced vibration, the pressure fluctuation energy of fluid is consumed Amount, completes the filtering of intermediate frequency pressure fluctuation；
3), by connection in series-parallel H mode filter group, and taper structure changes damping hole, cone Shape inserts pipe and fluid produces resonance, consumes pulsation energy, completes low frequency pulsation Filtering；
4), it is designed as the axial length of wave filter pulsing more than hydraulic system main pressure Wavelength, and connection in series-parallel H mode filter length, S type cavity volume filter length and S type bullet Property thin-walled 7 length is equal with filter length, makes pressure peak position be constantly in filtering The effective range of device, 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 seam The switch in hole, completes pressure fluctuation adaptive-filtering.
Above detailed description of the invention is only the preferred embodiment of this creation, not in order to limit Make this creation, all made within this spirit created and principle any amendment, equivalent Replacement, improvement etc., within should be included in the protection domain of this creation.

Claims (4)

1. the Hydraulic filtration method of a full frequency band structure changes, it is characterised in that: it uses a kind of filter, and this device includes input pipe, shell, outlet tube, S type elastic thin-wall, H mode filter and cascaded H mode filter；Wherein, described input pipe is connected to one end of shell；Described outlet tube is connected to the other end of shell；Described S type elastic thin-wall is installed in shell along the radial direction of shell, forms expansion chamber and contraction chamber in it；Described input pipe, outlet tube and S type elastic thin-wall are collectively forming a S type cavity volume wave filter；Some taper structure changes damping holes are uniformly had in the axial direction of described S type elastic thin-wall；Described taper structure changes damping hole is made up of cone shaped elastic damping hole pipe and slot apertures；Resonance series cavity volume I and parallel resonance cavity volume is formed between described S type elastic thin-wall and shell；The outside of described resonance series cavity volume I sets a resonance series cavity volume II, inserts pipe by a taper and connect between described resonance series cavity volume I and resonance series cavity volume II；Described H mode filter is positioned at parallel resonance cavity volume, and it is connected with taper structure changes damping hole；Described cascaded H mode filter is positioned at resonance series cavity volume I and resonance series cavity volume II, and it is also connected with taper structure changes damping hole；Described H mode filter and cascaded H mode filter are axially symmetrical set, and form connection in series-parallel H mode filter；
It includes following method:
1), hydraulic fluid enters S type cavity volume wave filter by input pipe, and the cavity volume of expansion absorbs unnecessary liquid stream, completes the filtering of high frequency pressure pulsations；
2), by S type elastic thin-wall forced vibration, consume the pressure fluctuation energy of fluid, complete the filtering of intermediate frequency pressure fluctuation；
3), by connection in series-parallel H mode filter group, and taper structure changes damping hole, taper insertion pipe and fluid produce resonance, consume energy of pulsing, complete the filtering of low frequency pulsation；
3), by the flexible of the cone shaped elastic damping hole pipe of taper structure changes damping hole and the switch of slot apertures, pressure fluctuation adaptive-filtering is completed.
2. the Hydraulic filtration method of full frequency band structure changes 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.
3. the Hydraulic filtration method of full frequency band structure changes as claimed in claim 1, it is characterised in that: 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.
4. the Hydraulic filtration method of full frequency band structure changes as claimed in claim 1, it is characterised in that: 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 °.
CN201610311918.7A 2016-05-12 2016-05-12 Hydraulic wave filtering method for full-band variable structure Withdrawn CN105864189A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201610311918.7A CN105864189A (en) 2016-05-12 2016-05-12 Hydraulic wave filtering method for full-band variable structure

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201610311918.7A CN105864189A (en) 2016-05-12 2016-05-12 Hydraulic wave filtering method for full-band variable structure

Publications (1)

Publication Number Publication Date
CN105864189A true CN105864189A (en) 2016-08-17

Family

ID=56630846

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201610311918.7A Withdrawn CN105864189A (en) 2016-05-12 2016-05-12 Hydraulic wave filtering method for full-band variable structure

Country Status (1)

Country Link
CN (1) CN105864189A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108593273A (en) * 2018-04-16 2018-09-28 北京工业大学 A kind of fluctuation pressure attenuating device and its performance test methods towards low frequency
CN115126739A (en) * 2022-07-14 2022-09-30 燕山大学 Composite type attenuation device for digital valve group pressure pulsation and test method thereof

Citations (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN87101425A (en) * 1987-11-21 1988-08-24 李培滋 Filter
CN1546198A (en) * 2003-11-28 2004-11-17 邝念曾 Method and system for purifying hydraulic-oil
CN2668908Y (en) * 2003-11-28 2005-01-05 邝念曾 Hydraulic oil purifying system
CN201428670Y (en) * 2009-07-06 2010-03-24 蔡秉余 Composite oil filter of filter element and magnetic sheets
CN102235401A (en) * 2010-05-06 2011-11-09 中国商用飞机有限责任公司 Oil filter capable of controlling pressure fluctuation
CN102374210A (en) * 2010-08-12 2012-03-14 贺勍 Detachable fineness grading series integral-type seal-sealing magnetic filter
CN102454664A (en) * 2010-10-21 2012-05-16 杨洁 Device for automatically cleaning oil filter for hydraulic system
US20120228231A1 (en) * 2008-04-30 2012-09-13 Cpc Corporation, Taiwan Novel Filtration Method for Refining and Chemical Industries
CN102734550A (en) * 2012-06-08 2012-10-17 绍兴文理学院 Intelligent hydraulic valve capable of detecting and repairing chucking fault
CN102797716A (en) * 2012-08-29 2012-11-28 绍兴文理学院 Hydraulic system of vertical numerical control spinning machine
CN103867537A (en) * 2014-03-20 2014-06-18 上海朗境流体技术有限公司 Return filter and method of filtering fluid by using return filter
JP2015000385A (en) * 2013-06-17 2015-01-05 株式会社東芝 Water treatment method using filter aid, and device for the method
CN104632792A (en) * 2014-12-12 2015-05-20 燕山大学 Pipe type variable-damping filter provided with multiple holes with different parameters and applied to opening of hydraulic pump
CN104778366A (en) * 2015-04-17 2015-07-15 燕山大学 Calculating method for inherent frequency of pipe type porous H-shaped hydraulic filter

Patent Citations (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN87101425A (en) * 1987-11-21 1988-08-24 李培滋 Filter
CN1546198A (en) * 2003-11-28 2004-11-17 邝念曾 Method and system for purifying hydraulic-oil
CN2668908Y (en) * 2003-11-28 2005-01-05 邝念曾 Hydraulic oil purifying system
US20120228231A1 (en) * 2008-04-30 2012-09-13 Cpc Corporation, Taiwan Novel Filtration Method for Refining and Chemical Industries
CN201428670Y (en) * 2009-07-06 2010-03-24 蔡秉余 Composite oil filter of filter element and magnetic sheets
CN102235401A (en) * 2010-05-06 2011-11-09 中国商用飞机有限责任公司 Oil filter capable of controlling pressure fluctuation
CN102374210A (en) * 2010-08-12 2012-03-14 贺勍 Detachable fineness grading series integral-type seal-sealing magnetic filter
CN102454664A (en) * 2010-10-21 2012-05-16 杨洁 Device for automatically cleaning oil filter for hydraulic system
CN102734550A (en) * 2012-06-08 2012-10-17 绍兴文理学院 Intelligent hydraulic valve capable of detecting and repairing chucking fault
CN102797716A (en) * 2012-08-29 2012-11-28 绍兴文理学院 Hydraulic system of vertical numerical control spinning machine
JP2015000385A (en) * 2013-06-17 2015-01-05 株式会社東芝 Water treatment method using filter aid, and device for the method
CN103867537A (en) * 2014-03-20 2014-06-18 上海朗境流体技术有限公司 Return filter and method of filtering fluid by using return filter
CN104632792A (en) * 2014-12-12 2015-05-20 燕山大学 Pipe type variable-damping filter provided with multiple holes with different parameters and applied to opening of hydraulic pump
CN104778366A (en) * 2015-04-17 2015-07-15 燕山大学 Calculating method for inherent frequency of pipe type porous H-shaped hydraulic filter

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
杜润: "液压系统脉动衰减器的特性分析", 《中国博士学位论文全文数据库工程科技Ⅱ辑》 *
桑青青: "多薄板振动式脉动衰减器滤波机理与特性分析", 《中国优秀硕士学位论文全文数据库工程科技Ⅱ辑》 *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108593273A (en) * 2018-04-16 2018-09-28 北京工业大学 A kind of fluctuation pressure attenuating device and its performance test methods towards low frequency
CN108593273B (en) * 2018-04-16 2020-05-22 北京工业大学 Low-frequency-oriented pulsation pressure attenuation device and performance test method thereof
CN115126739A (en) * 2022-07-14 2022-09-30 燕山大学 Composite type attenuation device for digital valve group pressure pulsation and test method thereof

Similar Documents

Publication Publication Date Title
US20230220853A1 (en) Systems and methods for managing noise in compact high speed and high force hydraulic actuators
CN101801763B (en) Duct provided with a device for absorption of pressure pulses
CN103604259B (en) The reservoir of compressor, compressor and noise control method
CN106121774A (en) A kind of low noise combined type multi-cavity exhaust silencer
CN104948265A (en) Impedance compound muffler
CN105864189A (en) Hydraulic wave filtering method for full-band variable structure
CN105864155A (en) Pressure pulsation suppression method for full-band hydraulic system
CN101614231B (en) Broad-spectrum-filtration vibration-absorbing silencer of hydraulic system
CN105909598A (en) Full-frequency-band hydraulic system pressure pulsating suppression device
CN105864209A (en) Method for restraining pressure pulsation of hydraulic system
CN104422109A (en) Silencer for air conditioner and air conditioner with same
CN201496347U (en) Wide frequency hydraulic system vibration-damping dissipative muffler
CN104500178B (en) A kind of complex muffler preventing and treating diesel generating set low-frequency noise
CN104632792A (en) Pipe type variable-damping filter provided with multiple holes with different parameters and applied to opening of hydraulic pump
CN104464709A (en) Variable-damping mechanical impedance combined sound absorption structure
CN104778366B (en) A kind of computational methods of tubular porous H types hydraulic filter intrinsic frequency
CN105889230A (en) S-shaped cavity adaptive hydraulic filtering method for full-band working conditions
CN105864190A (en) Variable structure working condition self-adaption hydraulic filtering equipment
CN105889200A (en) Full-band variable structure working condition adaptive hydraulic filtering method
CN105864122A (en) Hydraulic filtering method self-adaptive to full-frequency-band working conditions
CN105864211A (en) Variable-structure hydraulic filtering device
CN105889203A (en) Full-band variable structure working condition adaptive hydraulic filtering system
CN102261418B (en) Method and device for absorbing energy of automatic setting type hydraulic vibrating wave
CN105864156A (en) Hydraulic system pressure pulsation restraining device
CN105864223A (en) Hydraulic filtering method self-adaptive to working conditions

Legal Events

Date Code Title Description
C06 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
WW01 Invention patent application withdrawn after publication
WW01 Invention patent application withdrawn after publication

Application publication date: 20160817