CN105864192A - Filtering method adopting full-band variable structure filtering, magnetizing and adsorbing - Google Patents

Abstract

The invention relates to a filtering method adopting full-band variable structure filtering, magnetizing and adsorbing. According to the filtering method, a filter is used for attenuating pressure/flow pulsation of hydraulic oil, and a full-band variable structure filter is adopted as the filter. Solid particles are separated through a U-type particle separation module, so that the solid particles in oil move towards the pipe wall, enter an oil return barrel through an oil return barrel oil inlet pipe and then flow back to an oil tank. Oil containing trace small-grain-size particles in the center of a pipeline enters an inner barrel through an inner barrel oil inlet pipe for high-precision filtering, and the service life of a filtering element is prolonged. The oil entering the inner barrel oil inlet pipe flows into a spiral runner of the inner barrel in a tangential inflow manner, the inner barrel wall serves as the filtering element, filtrate flows in the manner of being closely attached to the filtering element under the action of centrifugal force and fast flows parallel to the surface of the filtering element, and filtered hydraulic oil flows out to an outer barrel in the direction perpendicular to the surface of the filtering element. Pollution particles deposited at the bottom of the inner barrel are discharged to the oil return barrel through an electric control check valve, and therefore the service life of the filtering element is prolonged.

Description

A filtering method using full-band variable structure filtering, magnetization and adsorption

【Technical field】

The invention relates to a hydraulic oil filtering method, in particular to a filtering method using full-frequency band variable structure filtering, magnetization and adsorption, and belongs to the technical field of hydraulic equipment.

【Background technique】

Statistics at home and abroad show that about 70% to 85% of hydraulic system failures are caused by oil pollution. Solid particles are the most common and harmful pollutants in oil pollution. Hydraulic system failures caused by solid particle pollutants account for 70% of total pollution failures. Metal debris accounts for 20% to 70% of the particle pollutants in hydraulic system oil. Taking effective measures to filter out the solid particle pollutants in the oil is the key to the pollution control of the hydraulic system, and it is also a reliable guarantee for the safe operation of the system.

Filters are key components of hydraulic systems to remove solid particle contaminants. The solid particle pollutants in the hydraulic oil are mainly filtered out by the oil filter device, except for some larger particles that can be deposited in the oil tank. Especially the high-pressure filter device is mainly used to filter the hydraulic oil flowing to the control valve and hydraulic cylinder to protect such hydraulic components with poor anti-pollution ability, so the cleanliness of the hydraulic oil is required to be higher.

However, the high-pressure filter used in the existing hydraulic system has the following deficiencies: (1) The flow pulsation and pressure pulsation caused by the periodic oil discharge mechanism of the hydraulic pump in the hydraulic system cause the filter element in the filter to be forced to work. Vibration reduces the filtration performance; (2) Various hydraulic components have different requirements for the cleanliness of the oil, and the particle sizes of the solid particles in the oil are also different, so it is necessary to install them at different positions in the hydraulic system There are many different types of filters, which brings about the problems of cost and installation complexity; (3) The filter in the hydraulic system mainly adopts the filter cake filter method. When filtering, the filtrate flows perpendicular to the surface of the filter element, and the intercepted solid The particles form a filter cake and gradually thicken, and the filtration rate gradually decreases until the filtrate stops flowing out, reducing the service life of the filter element.

Therefore, in order to solve the above technical problems, it is indeed necessary to provide an innovative filtering method using full-band variable structure filtering, magnetization and adsorption to overcome the above-mentioned defects in the prior art.

【Content of invention】

In order to solve the above technical problems, the purpose of the present invention is to provide a filter method with good filter performance, high adaptability and integration, and long service life that adopts full-band variable structure filter, magnetization and adsorption.

In order to achieve the above object, the technical solution adopted by the present invention is: a filtering method using full-band variable structure filtering, magnetization and adsorption, which adopts a filter box, which includes a bottom plate, a filter, and a U-shaped particle separation module , oil return cylinder, inner cylinder, spiral flow channel, filter element, outer barrel and end cap; wherein, the filter, U-shaped particulate separation module, oil return barrel, and outer barrel are placed on the bottom plate in sequence; the filter includes Input pipe, casing, output pipe, S-shaped elastic thin wall, H-type filter and series H-type filter; wherein, the input pipe is connected to one end of the casing, which is connected to a hydraulic oil inlet; the output pipe is connected to At the other end of the shell, it is docked with the U-shaped particle separation module; the S-shaped elastic thin wall is installed in the shell along the radial direction of the shell, and an expansion cavity and a contraction cavity are formed in it; the input pipe, the output pipe and the S-shaped elastic The thin walls together form an S-shaped cavity filter; the S-shaped elastic thin wall is evenly opened with a number of tapered variable structure damping holes in the axial direction; the tapered variable structure damping holes are composed of a tapered elastic damping hole tube and a slot hole Composition; a series resonance volume I and a parallel resonance volume are formed between the S-shaped elastic thin wall and the shell; a series resonance volume II is arranged outside the series resonance volume I, and the series resonance volume I and The series resonance chambers II are connected through a tapered insertion tube; the H-type filter is located in the parallel resonance chamber, which communicates with the tapered variable structure damping hole; the series H-type filter is located in the series resonance chamber I and the series resonant cavity II are also connected to the tapered variable structure damping hole; the H-type filter and the series-connected H-type filter are axially symmetrically arranged to form a series-parallel H-type filter; the U The U-shaped particle separation module includes a U-shaped tube, on which a temperature control module, a magnetization module, an adsorption module, and a degaussing module are sequentially installed; the U-shaped particle separation module and the oil return cylinder pass through an oil return cylinder oil inlet pipe connection; the inner cylinder is placed in the outer barrel, which is installed on the end cover through a top plate and several bolts; the spiral flow channel is accommodated in the inner cylinder, and the U-shaped particle separation module is connected to the U-shaped particle separation module through an inner cylinder. The oil pipe is connected; the oil inlet pipe of the inner cylinder is located in the oil inlet pipe of the oil return cylinder, and extends into the center of the U-shaped particle separation module. The filter element is arranged on the inner wall of the inner barrel; the bottom of the outer barrel is provided with a hydraulic oil outlet;

It includes the following steps:

1), the oil in the hydraulic pipeline passes through the filter, and the filter attenuates the pulsating pressure of the high, medium and low frequency bands in the hydraulic system, and suppresses the flow fluctuation;

2), the hydraulic oil enters the temperature control module of the U-shaped particle separation module, adjusts the oil temperature to the optimum magnetization temperature of 40-50°C through the temperature control module, and then enters the magnetization module;

3), through the magnetization device, the metal particles in the oil are magnetized in the magnetic field, and the micron-sized metal particles are aggregated into large particles; then enter the adsorption module;

4), the magnetic polymer particles in the oil are adsorbed by the adsorption module; then enter the degaussing module 35;

5), eliminate the magnetism of magnetic particles through the degaussing module;

6), the oil near the tube wall of the U-shaped particle separation module enters the oil return tube through the oil return tube inlet pipe and then flows back to the oil tank, while the oil in the center of the pipeline containing a small amount of small particle size particles enters the inner tube through the oil inlet tube of the inner tube. Cartridge for high-precision filtration;

7), the oil carrying small particles flows into the spiral channel of the inner cylinder in a tangential flow, and the oil flows closely to the filter element under the action of centrifugal force, and performs high-precision filtration;

8), the high-precision filtered oil is discharged into the outer cylinder and discharged through the hydraulic oil outlet at the bottom of the outer cylinder.

The filter method of the present invention adopting full-band variable structure filtering, magnetization and adsorption further includes: the axes of the input pipe and the output pipe are not on the same axis; the wide opening of the tapered variable structure damping hole is located in the series resonance volume I And in the parallel resonant cavity, the taper angle is 10°; the Young’s modulus of the conical elastic damping hole tube with tapered structure damping hole is larger than the Young’s modulus of the elastic thin wall, and can be pulled with the change of fluid pressure Stretch or compress; the Young's modulus of the slit hole is larger than that of the tapered elastic damping hole tube, which can be opened or closed with the fluid pressure; the wide opening of the tapered insertion tube is located in the series resonance volume II Inside, its taper angle is 10°.

The filtering method adopting full-frequency variable structure filtering, magnetization and adsorption of the present invention further includes: the temperature control module includes a heater, a cooler and a temperature sensor; the heater is heated by Chongqing Jinhong lubricating oil with temperature detection The cooler is a surface evaporative air cooler, and the finned tube of the cooler is a KLM-type finned tube; the temperature sensor is a platinum resistance temperature sensor.

The filter method of the present invention that adopts full-band variable structure filtering, magnetization and adsorption is further as follows: the magnetization module includes aluminum pipes, several windings, iron shells, flanges and several magnetization current output modules; wherein, the several windings They are respectively wound outside the aluminum pipe, and each winding is composed of a positive winding and a reverse winding; the iron shell is covered on the aluminum pipe; the flanges are welded at both ends of the aluminum pipe; each magnetizing current output module connected to a winding.

The filter method of the present invention adopting full-frequency variable structure filtering, magnetization and adsorption is further as follows: the adsorption module specifically adopts a homopolar adjacent type adsorption ring, and the homopolar adjacent type adsorption ring includes an aluminum ring pipe, a forward spiral wire tube, reverse solenoid and iron magnetic permeable cap; the forward solenoid and reverse solenoid are respectively arranged in the aluminum annular pipe, and the two have opposite currents, so that the forward solenoid The magnetic poles of the same sex are generated adjacent to the wire tube and the reverse solenoid; the iron magnetic permeable cap is arranged on the inner wall of the aluminum annular pipe, which is located adjacent to the forward solenoid and the reverse solenoid, and The midpoint of the forward and reverse solenoid axes.

The filter method of the present invention adopting full-frequency variable structure filtering, magnetization and adsorption is further as follows: the adsorption module specifically adopts a homopolar adjacent adsorption ring with an electric hammer, and the homopolar adjacent adsorption ring with an electric hammer includes Aluminum annular pipe, forward solenoid, reverse solenoid, iron magnetic permeable cap, partition, electric hammer and electromagnet; the forward solenoid and reverse solenoid are respectively arranged on aluminum In the annular pipe, currents in opposite directions pass through the two, so that the adjacent positions of the forward solenoid and the reverse solenoid generate the same magnetic pole; the iron magnetic permeable cap is arranged on the inner wall of the aluminum annular pipe, and its Located adjacent to the forward and reverse solenoids and midway between the axes of the forward and reverse solenoids; the spacer is located between the forward and reverse solenoids The electric hammer and the electromagnet are located between the partitions; the electromagnet is connected and can push the electric hammer, so that the electric hammer strikes the inner wall of the aluminum annular pipe.

The filter method of the present invention adopting full-frequency variable structure filtering, magnetization and adsorption is further as follows: the bottom of the oil return cylinder is provided with an overflow valve, and the bottom of the overflow valve is provided with an electronically controlled adjusting screw; An oil discharge port is provided, and the oil discharge port is connected to an oil tank through a pipeline.

The filter method of the present invention adopting full-band variable structure filtering, magnetization and adsorption is further as follows: the bottom of the inner cylinder is in the shape of a round table, which is connected to the oil return cylinder through an inner cylinder oil discharge pipe, and an oil discharge pipe of the inner cylinder is provided with a Electric check valve.

The filter method of the present invention adopting full-band variable structure filtering, magnetization and adsorption is further as follows: a hollow cylinder is vertically arranged in the center of the inner cylinder, and a pressure difference indicator is arranged above the hollow cylinder, and the pressure difference indicator is installed on On the end cover; the oil inlet pipe of the inner cylinder is connected tangentially with the spiral flow channel.

The filtering method of the present invention adopting full-band variable structure filtering, magnetization and adsorption further includes: the precision of the filter element is 1-5 microns.

Compared with the prior art, the present invention has the following beneficial effects:

1. Attenuate the pressure/flow pulsation of the hydraulic oil through the filter, so that the filter element does not vibrate during operation, so as to improve the filtration performance; the hydraulic oil realizes the separation of solid particles in the U-shaped particle separation module, so that the solid particles in the oil Moving towards the pipe wall, at the outlet of the U-shaped particle separation module, the oil near the pipe wall rich in solid particles enters the oil return cylinder through the oil return tube inlet pipe and then returns to the oil tank, while the pipeline containing only a small amount of small particles The oil in the center enters the inner cylinder through the oil inlet pipe of the inner cylinder for high-precision filtration, which improves the service life of the filter element and reduces the cost and complexity of filtering; the oil entering the oil inlet pipe of the inner cylinder flows into the inner cylinder in a tangential way. The spiral channel of the cylinder, the inner cylinder wall is the filter element, the filtrate flows close to the filter element under the action of centrifugal force, the filtrate flows quickly parallel to the surface of the filter element, and the filtered hydraulic oil flows out to the outer cylinder perpendicular to the surface of the filter element. This cross-flow filtration method sweeps the particles on the surface of the filter element, suppressing the increase in the thickness of the filter cake, and the pollution particles deposited at the bottom of the inner cylinder can be discharged to the oil return cylinder through the electronically controlled check valve at regular intervals, thereby improving the service life of the filter element .

2. By controlling the temperature and magnetic field strength of the hydraulic oil, the particles in the oil are strongly magnetized and aggregated into large particles, and the colloidal particles are decomposed and ablated, and efficient adsorption is formed through the adsorption module, and the residual particles are demagnetized by the degaussing device to avoid damage to the hydraulic pressure. Components, so that the solid particles in the oil gather into large particles and move to the vicinity of the pipe wall.

3. The generation of the non-uniform magnetic field required for magnetization requires multiple pairs of forward and reverse coils and currents of different sizes, and the current value can be digitally set online.

【Description of drawings】

Fig. 1 is a structural schematic diagram of a filter box adopting full frequency band variable structure filtering, magnetization and adsorption according to the present invention.

FIG. 2 is a schematic structural diagram of the filter in FIG. 1 .

Fig. 3 is a sectional view along A-A in Fig. 2 .

FIG. 4 is a schematic diagram of the H-type filter in FIG. 3 .

FIG. 5 is a schematic diagram of the H-type filter in series in FIG. 3 .

Fig. 6 is a combination diagram of frequency characteristics of an H-type filter and a series H-type filter. Among them, the solid line is the frequency characteristic of the series H-type filter.

Figure 7 is a series-parallel H-type filter frequency characteristic diagram.

Fig. 8 is a schematic structural diagram of an S-shaped cavity filter.

Fig. 9 is a schematic cross-sectional view of an S-shaped elastic thin wall.

Fig. 10 is a schematic diagram of the tapered variable structure damping hole in Fig. 2 .

Figure 10(a) to Figure 10(c) are diagrams of the working state of the tapered variable structure damping hole.

Fig. 11 is a schematic diagram of the U-shaped particle separation module in Fig. 1 .

FIG. 12 is a schematic structural diagram of the magnetization module in FIG. 11 .

FIG. 13 is a schematic structural diagram of the winding in FIG. 12 .

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

Fig. 15 is a schematic structural view of the adsorption module shown in Fig. 11 as a homopolar adjacent adsorption ring.

FIG. 16 is a schematic structural view of the adsorption module in FIG. 11 being a homopolar adjacent adsorption ring with an electric hammer.

【detailed description】

Please refer to accompanying drawings 1 to 16 of the description, the present invention is a filter box adopting full-band variable structure filtering, magnetization and adsorption, which consists of a bottom plate 6, a filter 8, a U-shaped particulate separation module 3, an oil return Tube 7, inner tube 15, spiral flow channel 17, filter element 18, outer barrel 19 and end cap 25 are composed of several parts. Wherein, the filter 8 , the U-shaped particulate separation module 2 , the oil return cylinder 7 , and the outer barrel 19 are placed on the bottom plate 6 in sequence.

The filter 8 is used to input the hydraulic oil, and can attenuate the pulsating pressure in the high, medium and low frequency bands in the hydraulic system, and suppress the flow fluctuation. The filter 8 is composed of an input pipe 81 , a housing 88 , an output pipe 89 , an S-shaped elastic thin wall 87 , an H-shaped filter 812 and a series H-shaped filter 813 .

Wherein, the input pipe 81 is connected to one end of the casing 89 , which is connected to a hydraulic oil inlet 1 ; the output pipe 811 is connected to the other end of the casing 89 , which is connected to the U-shaped particle separation module 3 . The S-shaped elastic thin wall 87 is installed inside the casing 88 along the radial direction of the casing, and an expansion cavity 71 and a contraction cavity 72 are formed therein. The axes of the input pipe 81 and the output pipe 89 are not on the same axis, which can improve the filtering effect by more than 10%.

The input pipe 81 , output pipe 89 and S-shaped elastic thin wall 87 jointly form an S-shaped cavity filter, thereby attenuating high-frequency pressure pulsation of the hydraulic system. The filter transmission coefficient obtained after processing according to the lumped parameter method is:

$\mathrm{<span\; class="notranslate">\; \&gamma;</span>}<span\; class="notranslate">\; =</span>\frac{\mathrm{<span\; class="notranslate">\; 1</span>}}{\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; +</span>{<span\; class="notranslate">\; (</span>\frac{\mathrm{<span\; class="notranslate">\; 2</span>}\mathrm{<span\; class="notranslate">\; \&pi;</span>}\mathrm{<span\; class="notranslate">\; f</span>}}{\mathrm{<span\; class="notranslate">\; Z</span>}}<span\; class="notranslate">\; \&Center\; Dot;</span>\frac{\frac{\mathrm{<span\; class="notranslate">\; 2</span>}}{\mathrm{<span\; class="notranslate">\; 3</span>}}{\mathrm{<span\; class="notranslate">\; k</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}{\mathrm{<span\; class="notranslate">\; D.</span>}}^{\mathrm{<span\; class="notranslate">\; 3</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; k</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}{\mathrm{<span\; class="notranslate">\; d</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}\mathrm{<span\; class="notranslate">\; L</span>}}{{{\mathrm{<span\; class="notranslate">\; d</span>}}_{\mathrm{<span\; class="notranslate">\; I</span>}}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; \&Center\; Dot;</span>\mathrm{<span\; class="notranslate">\; a</span>}}<span\; class="notranslate">\; )</span>}^{\mathrm{<span\; class="notranslate">\; 2</span>}}}$

a—speed of sound in medium L—length of contraction cavity D—diameter of expansion cavity Z—characteristic impedance

γ—transmission coefficient f—pressure fluctuation frequency d _I —input tube diameter d—shrink chamber diameter

k ₁ —expansion chamber coefficient k ₂ —contraction chamber coefficient

It can be seen from the above formula that the S-type capacitor filter is similar to the capacitance in the circuit. When pressure pulsation waves of different frequencies pass through the filter, the transmission coefficient varies with frequency. The higher the frequency, the smaller the transmission coefficient, which indicates that the high-frequency pressure pulsation wave is attenuated more strongly when passing through the filter, thereby eliminating the high-frequency pressure pulsation. At the same time, in the S-shaped cavity structure of the present invention, the transition between the expansion cavity and the contraction cavity is smooth, which helps to reduce the system pressure loss caused by the sudden change of the cavity diameter. The input pipe and output pipe of the filter are not on the same axis, which can improve the filtering effect by more than 10%.

The design principle of the S-shaped cavity filter is as follows: when the changing flow enters the expansion cavity of the S-shaped cavity through the input pipe, the liquid flow exceeds the average flow rate, and the enlarged expansion cavity can absorb the excess liquid flow, and when the flow rate is lower than Discharges flow at average flow, thereby absorbing pressure pulsation energy. The combination of multi-stage expansion cavity and contraction cavity improves the filter's pulsating pressure absorption capacity, that is, the filtering performance. The smooth transition between the expansion cavity and the contraction cavity avoids the pressure loss and heat along the process caused by the sudden change of the fluid interface.

The S-shaped elastic thin wall 87 weakens the high-frequency pressure pulsation in the hydraulic system through forced mechanical vibration. The natural frequency of the S-type elastic thin-wall obtained after processing according to the lumped parameter method is:

${\mathrm{<span\; class="notranslate">\; f</span>}}_{\mathrm{<span\; class="notranslate">\; m</span>}}<span\; class="notranslate">\; =</span>\frac{{\mathrm{<span\; class="notranslate">\; k</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}\mathrm{<span\; class="notranslate">\; h</span>}}{\mathrm{<span\; class="notranslate">\; 2</span>}{\mathrm{<span\; class="notranslate">\; \&pi;R</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}}<span\; class="notranslate">\; \&Center\; Dot;</span>\sqrt{\frac{\mathrm{<span\; class="notranslate">\; E.</span>}}{\mathrm{<span\; class="notranslate">\; 12</span>}\mathrm{<span\; class="notranslate">\; \&rho;</span>}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; \&eta;</span>}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; \&mu;</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; )</span>}}$

k—S-type elastic thin-wall structure coefficient h—S-type elastic thin-wall thickness R—S-type elastic thin-wall radius

E—Young's modulus of S-type elastic thin wall ρ—Mass density of S-type elastic thin wall

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

Substituting the actual parameters and performing simulation analysis on the above formula, it can be found that the natural frequency of the S-type elastic thin wall 87 is usually higher than that of the H-type filter, and its attenuation frequency band is also wider than that of the H-type filter. In a relatively wide frequency range, the S-shaped elastic thin wall has a good attenuation effect on pressure fluctuations. At the same time, the S-shaped elastic thin wall in the filter structure of the present invention has a larger and thinner radius, and its natural frequency is closer to the mid-frequency range, which can effectively attenuate mid-high frequency pressure fluctuations in the hydraulic system.

The design principle of the S-shaped elastic thin-wall 87 is as follows: when medium-frequency pressure fluctuations occur in the pipeline, the S-shaped cavity has a weak attenuation ability for pressure fluctuations, and the periodic pulsating pressure flowing into the S-shaped cavity of the filter continues to act on the S-shaped cavity. On the inner and outer walls of the type elastic thin wall 87, since the inner and outer walls are fixedly connected by pillars, the inner and outer elastic thin walls vibrate periodically according to the frequency of the pulsating pressure, and the forced vibration consumes the pressure pulsation energy of the fluid, thereby realizing the Band pressure filtering. According to the principle of virtual work, the ability of the elastic thin wall to consume fluid pulsating pressure energy is directly related to the sum of potential energy and kinetic energy when it is forced to vibrate. In order to improve the filtering performance of the middle frequency band, the radius of the elastic thin wall is designed to be much larger than the pipe radius. And the thickness of the thin wall is relatively small, typically less than 0.1 mm.

Further, a series resonant cavity I84 and a parallel resonant cavity 85 are formed between the S-shaped elastic thin wall 87 and the housing 88 . A series resonance volume II83 is arranged on the outside of the series resonance volume I84, and the series resonance volume I84 and the series resonance volume II83 are connected through a tapered insertion tube 82, and the opening of the tapered insertion tube 82 is relatively small. The wide part is located in the series resonance volume II83, and its taper angle is 10°. The S-shaped elastic thin wall 87 is uniformly provided with several tapered variable structure damping holes 86 in the axial direction.

The H-type filter 812 is located in the parallel resonant cavity 85 , which communicates with the tapered deformation structure damping hole 86 . The wider opening of the tapered deformation structure damping hole 86 is located in the series resonance cavity I84 and the parallel resonance cavity 85, and its taper angle is 10°. The natural angular frequency of the filter obtained after processing according to the lumped parameter method is:

$\begin{array}{cc}\mathrm{<span\; class="notranslate">\; \&omega;</span>}<span\; class="notranslate">\; =</span>\frac{\mathrm{<span\; class="notranslate">\; a</span>}<span\; class="notranslate">\; \&Center\; Dot;</span>{\mathrm{<span\; class="notranslate">\; D.</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}}{{\mathrm{<span\; class="notranslate">\; D.</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}}\sqrt{\frac{\mathrm{<span\; class="notranslate">\; 1</span>}}{{\mathrm{<span\; class="notranslate">\; L</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}{\mathrm{<span\; class="notranslate">\; L</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}}}& <span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; r</span>}\mathrm{<span\; class="notranslate">\; a</span>}\mathrm{<span\; class="notranslate">\; d</span>}<span\; class="notranslate">\; /</span>\mathrm{<span\; class="notranslate">\; the\; s</span>}<span\; class="notranslate">\; )</span>\end{array}$

a - speed of sound in the medium L ₁ - length of the damping hole D ₁ - diameter of the damping hole

L ₂ —height of the parallel resonance cavity D ₂ —diameter of the parallel resonance cavity.

The series H-type filter 813 is located in the series resonance cavity I84 and the series resonance cavity II83 , which are also connected to the tapered variable structure damping hole 86 . After being processed by the lumped parameter method, the two natural angular frequencies of the series H-type filter 813 are:

${\mathrm{<span\; class="notranslate">\; \&omega;</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; =</span>\frac{\sqrt{\mathrm{<span\; class="notranslate">\; \&pi;</span>}}\mathrm{<span\; class="notranslate">\; a</span>}}{\sqrt{\mathrm{<span\; class="notranslate">\; 2</span>}}\sqrt{{\frac{{\mathrm{<span\; class="notranslate">\; \&pi;l</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; (</span>{{\mathrm{<span\; class="notranslate">\; d</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}{\mathrm{<span\; class="notranslate">\; l</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; +</span>{{\mathrm{<span\; class="notranslate">\; d</span>}}_{\mathrm{<span\; class="notranslate">\; 4</span>}}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}{\mathrm{<span\; class="notranslate">\; l</span>}}_{\mathrm{<span\; class="notranslate">\; 4</span>}}<span\; class="notranslate">\; )</span>}{\mathrm{<span\; class="notranslate">\; 4</span>}{{\mathrm{<span\; class="notranslate">\; d</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; +</span>\frac{{{\mathrm{<span\; class="notranslate">\; \&pi;d</span>}}_{\mathrm{<span\; class="notranslate">\; 4</span>}}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}{\mathrm{<span\; class="notranslate">\; l</span>}}_{\mathrm{<span\; class="notranslate">\; 4</span>}}{\mathrm{<span\; class="notranslate">\; l</span>}}_{\mathrm{<span\; class="notranslate">\; 3</span>}}}{\mathrm{<span\; class="notranslate">\; 4</span>}{{\mathrm{<span\; class="notranslate">\; d</span>}}_{\mathrm{<span\; class="notranslate">\; 3</span>}}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}}<span\; class="notranslate">\; +</span>\sqrt{{<span\; class="notranslate">\; \&lsqb;</span>{\frac{{\mathrm{<span\; class="notranslate">\; \&pi;l</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; (</span>{{\mathrm{<span\; class="notranslate">\; d</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}{\mathrm{<span\; class="notranslate">\; l</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; +</span>{{\mathrm{<span\; class="notranslate">\; d</span>}}_{\mathrm{<span\; class="notranslate">\; 4</span>}}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}{\mathrm{<span\; class="notranslate">\; l</span>}}_{\mathrm{<span\; class="notranslate">\; 4</span>}}<span\; class="notranslate">\; )</span>}{\mathrm{<span\; class="notranslate">\; 4</span>}{{\mathrm{<span\; class="notranslate">\; d</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; -</span>\frac{{{\mathrm{<span\; class="notranslate">\; \&pi;d</span>}}_{\mathrm{<span\; class="notranslate">\; 4</span>}}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}{\mathrm{<span\; class="notranslate">\; l</span>}}_{\mathrm{<span\; class="notranslate">\; 4</span>}}{\mathrm{<span\; class="notranslate">\; l</span>}}_{\mathrm{<span\; class="notranslate">\; 3</span>}}}{\mathrm{<span\; class="notranslate">\; 4</span>}{{\mathrm{<span\; class="notranslate">\; d</span>}}_{\mathrm{<span\; class="notranslate">\; 3</span>}}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}}<span\; class="notranslate">\; \&rsqb;</span>}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; +</span>\frac{{\mathrm{<span\; class="notranslate">\; \&pi;</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}{{\mathrm{<span\; class="notranslate">\; d</span>}}_{\mathrm{<span\; class="notranslate">\; 4</span>}}}^{\mathrm{<span\; class="notranslate">\; 4</span>}}{{\mathrm{<span\; class="notranslate">\; l</span>}}_{\mathrm{<span\; class="notranslate">\; 4</span>}}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}{\mathrm{<span\; class="notranslate">\; l</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}{\mathrm{<span\; class="notranslate">\; l</span>}}_{\mathrm{<span\; class="notranslate">\; 3</span>}}}{\mathrm{<span\; class="notranslate">\; 4</span>}{\mathrm{<span\; class="notranslate">\; d</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}{\mathrm{<span\; class="notranslate">\; d</span>}}_{\mathrm{<span\; class="notranslate">\; 3</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}}}}}$

${\mathrm{<span\; class="notranslate">\; \&omega;</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; =</span>\frac{\sqrt{\mathrm{<span\; class="notranslate">\; \&pi;</span>}}\mathrm{<span\; class="notranslate">\; a</span>}}{\sqrt{\mathrm{<span\; class="notranslate">\; 2</span>}}\sqrt{{\frac{{\mathrm{<span\; class="notranslate">\; \&pi;l</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; (</span>{{\mathrm{<span\; class="notranslate">\; d</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}{\mathrm{<span\; class="notranslate">\; l</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; +</span>{{\mathrm{<span\; class="notranslate">\; d</span>}}_{\mathrm{<span\; class="notranslate">\; 4</span>}}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}{\mathrm{<span\; class="notranslate">\; l</span>}}_{\mathrm{<span\; class="notranslate">\; 4</span>}}<span\; class="notranslate">\; )</span>}{\mathrm{<span\; class="notranslate">\; 4</span>}{{\mathrm{<span\; class="notranslate">\; d</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; +</span>\frac{{{\mathrm{<span\; class="notranslate">\; \&pi;d</span>}}_{\mathrm{<span\; class="notranslate">\; 4</span>}}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}{\mathrm{<span\; class="notranslate">\; l</span>}}_{\mathrm{<span\; class="notranslate">\; 4</span>}}{\mathrm{<span\; class="notranslate">\; l</span>}}_{\mathrm{<span\; class="notranslate">\; 3</span>}}}{\mathrm{<span\; class="notranslate">\; 4</span>}{{\mathrm{<span\; class="notranslate">\; d</span>}}_{\mathrm{<span\; class="notranslate">\; 3</span>}}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}}<span\; class="notranslate">\; -</span>\sqrt{{<span\; class="notranslate">\; \&lsqb;</span>{\frac{{\mathrm{<span\; class="notranslate">\; \&pi;l</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; (</span>{{\mathrm{<span\; class="notranslate">\; d</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}{\mathrm{<span\; class="notranslate">\; l</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; +</span>{{\mathrm{<span\; class="notranslate">\; d</span>}}_{\mathrm{<span\; class="notranslate">\; 4</span>}}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}{\mathrm{<span\; class="notranslate">\; l</span>}}_{\mathrm{<span\; class="notranslate">\; 4</span>}}<span\; class="notranslate">\; )</span>}{\mathrm{<span\; class="notranslate">\; 4</span>}{{\mathrm{<span\; class="notranslate">\; d</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; -</span>\frac{{{\mathrm{<span\; class="notranslate">\; \&pi;d</span>}}_{\mathrm{<span\; class="notranslate">\; 4</span>}}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}{\mathrm{<span\; class="notranslate">\; l</span>}}_{\mathrm{<span\; class="notranslate">\; 4</span>}}{\mathrm{<span\; class="notranslate">\; l</span>}}_{\mathrm{<span\; class="notranslate">\; 3</span>}}}{\mathrm{<span\; class="notranslate">\; 4</span>}{{\mathrm{<span\; class="notranslate">\; d</span>}}_{\mathrm{<span\; class="notranslate">\; 3</span>}}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}}<span\; class="notranslate">\; \&rsqb;</span>}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; +</span>\frac{{\mathrm{<span\; class="notranslate">\; \&pi;</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}{{\mathrm{<span\; class="notranslate">\; d</span>}}_{\mathrm{<span\; class="notranslate">\; 4</span>}}}^{\mathrm{<span\; class="notranslate">\; 4</span>}}{{\mathrm{<span\; class="notranslate">\; l</span>}}_{\mathrm{<span\; class="notranslate">\; 4</span>}}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}{\mathrm{<span\; class="notranslate">\; l</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}{\mathrm{<span\; class="notranslate">\; l</span>}}_{\mathrm{<span\; class="notranslate">\; 3</span>}}}{\mathrm{<span\; class="notranslate">\; 4</span>}{\mathrm{<span\; class="notranslate">\; d</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}{\mathrm{<span\; class="notranslate">\; d</span>}}_{\mathrm{<span\; class="notranslate">\; 3</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}}}}}$

a—speed of sound in medium l ₁ —length of damping hole d ₁ —diameter of damping hole l ₃ —length of resonance tube

d ₃ —diameter of resonance tube l ₂ —height of series resonance chamber 1 d ₂ —diameter of series resonance chamber 1

l ₄ —the height of the series resonance cavity 2 d ₄ —the diameter of the series resonance cavity 2 .

The H-type filter 812 and the series-connected H-type filter 813 are axially symmetrically arranged, and form a series-parallel H-type filter, which is used to broaden the filtering frequency range and make the overall structure more compact. The present invention distributes a plurality of series-parallel H-type filters (only 2 are drawn in the figure) along the circumferential interface, and separates each other with a partition 820. The resonant frequency bands of these filters are different, and they are combined in Together, they can fully cover the entire mid-low frequency filtering frequency band, and realize full-spectrum filtering of the mid-low frequency band.

From the frequency characteristics and formulas of the H-type filter and the series H-type filter in Figure 6, it can be found that the series H-type filter has two natural angular frequencies, and the filtering effect is better at the peak, but basically has no filtering effect at the valley; The H-type filter has one natural corner frequency, and the filtering effect is better at the peak, but basically has no filtering effect at the valley; choose the appropriate filter parameters so that the natural corner frequency of the H-type filter just falls in the series Between the two natural angular frequencies of the H-type filter, as shown in Figure 7, three adjacent natural resonance frequency peaks are formed within a certain frequency range. In this frequency range, no matter the pressure pulsation frequency is at the peak A better filtering effect can be guaranteed at the trough. The filter bank composed of a plurality of series-parallel H-type filters can cover the entire middle and low frequency bands, and realize full-spectrum filtering of the middle and low frequency bands.

Further, the tapered variable structure damping hole 86 is composed of a tapered elastic damping hole tube 16 and a slit 15 , and the tapered narrower end opens to the elastic thin wall 7 . Wherein the Young's modulus of tapered elastic damping hole tube 16 is bigger than the Young's modulus of elastic thin wall 7, can stretch or compress with fluid pressure change; The Young's modulus of tube 16 should be large, can open or close according to fluid pressure. Therefore, when the pressure pulsation frequency falls in the high-frequency band, the C-type cavity filter structure acts as a filter, and the tapered elastic damping hole tube 16 and the slit 15 are in the state shown in Figure 10(a); and when the pulsation frequency falls in the middle frequency band , the filter structure becomes a C-type cavity filter structure and the elastic thin-walled 7 filter structure works together, and the tapered elastic damping hole tube 16 and the slit 15 are both in the state of Figure 10(a); when the pulsation frequency falls on For some specific low-frequency frequencies, the filter structure becomes a plug-in series-parallel H-type filter, a C-type cavity filter structure and an elastic thin-wall filter structure to work together, and the tapered elastic damping hole tube 16 and the slot hole 15 are all in the state of Figure 10(b), since the natural frequency of the plug-in series-parallel H-type filter is designed to be consistent with these specific low-frequency pulsation frequencies, it can have a better filtering effect on systems with large fundamental frequency energy; when the pulsation When the frequency falls in a low frequency range other than certain specific frequencies, both the tapered elastic damping hole tube 16 and the slit 15 are in the state shown in Figure 10(c). Such a variable structure filter design not only ensures the full frequency range and full working condition filtering of the hydraulic system, but also reduces the pressure loss of the filter under normal working conditions and ensures the hydraulic stiffness of the system.

The invention can also self-adaption pressure pulsation attenuation under continuous working conditions. When the working condition of the hydraulic system changes, the sudden stop or operation of the actuator and the change of the opening of the valve will cause a sudden change in the characteristic impedance of the pipeline system, so that the curve of the original pipeline pressure with time and position will also change , the position of the pressure peak also changes. Because the axial length of the filter of the present invention is designed to be greater than the main pressure pulsation wavelength of the system, and the length of the cavity of the series-parallel H-type filter bank of the filter, the length of the S-type cavity filter and the length of the elastic thin wall and The axial lengths of the filters are equal to ensure that the pressure peak position is always within the effective range of the filter; while the series-parallel H-type filter has a tapered deformation structure damping hole opened on the elastic thin wall, which is evenly distributed along the axial direction, so that the pressure peak The position change has almost no influence on the performance of the filter, thus realizing the adaptive filtering function of working conditions. Considering that the axial dimensions of the three filter structures are equivalent to those of the filter, this larger size also ensures that the hydraulic filter has a strong pressure pulsation attenuation capability.

The method for hydraulic pulsation filtering by adopting the hydraulic filter of the present invention is as follows:

1), the hydraulic fluid enters the S-shaped cavity filter through the input pipe, and the enlarged cavity absorbs excess liquid flow to complete the filtering of high-frequency pressure pulsation;

2), through the forced vibration of the S-shaped elastic thin wall 87, the pressure pulsation energy of the fluid is consumed, and the filtering of the intermediate frequency pressure pulsation is completed;

3), through the series-parallel H-type filter group, as well as the tapered variable structure damping hole, the tapered insertion tube and the fluid to generate resonance, consume pulsation energy, and complete the filtering of low-frequency pressure pulsation;

4), the axial length of the filter is designed to be greater than the main pressure pulsation wavelength of the hydraulic system, and the length of the series-parallel H-type filter, the length of the S-type cavity filter and the length of the S-type elastic thin wall 87 are equal to the filter length, Make the pressure peak position always within the effective range of the filter, and realize the filtering of the pressure pulsation when the system working condition changes;

5), through the expansion and contraction of the tapered elastic damping hole tube of the tapered variable structure damping hole and the opening and closing of the slit hole, the pressure pulsation adaptive filtering is completed.

The U-shaped particle separation module 3 includes a U-shaped tube 31 on which a temperature control module 32 , a magnetization module 33 , an adsorption module 34 and a demagnetization module 35 are sequentially installed.

The main purpose of the temperature control module 32 is to provide the magnetization module 33 with an optimal magnetization temperature of 40-50°C, and at the same time, it also has the function of reducing the viscosity of the oil, which includes a heater, a cooler and a temperature sensor. The heater adopts Chongqing Jinhong lubricating oil heater with temperature detection. The cooler can be a surface evaporative air cooler, which has the advantages of both water cooling and air cooling, and has a good heat dissipation effect. The light tube is used and the fluid resistance is small; the fin type of the cooler is high fin, and the finned tube is KLM finned tube , good heat transfer performance, small contact thermal resistance, large contact area between fins and tubes, tight and firm fit, good ability to withstand rapid changes in cold and heat, and high resistance to atmospheric corrosion at the root of the fins; the optimal number of tube rows of the air cooler is 8. The temperature sensor is a platinum resistance temperature sensor.

The magnetization module 33 realizes strong magnetization of metal particles, and aggregates micron-sized metal particles into large particles, which is convenient for subsequent adsorption and separation. At the same time, the magnetization module 32 also needs to provide a non-uniform magnetic field to magnetize and decompose the colloidal particles in the hydraulic oil, so that the colloidal particles can be decomposed into particles with smaller particle sizes to reduce pollution.

The magnetization module 33 is composed of an aluminum pipe 331 , several windings 332 , an iron shell 333 , a flange 334 and several magnetization current output modules 335 . Wherein, the aluminum pipe 331 is subjected to magnetization treatment by allowing the oil to flow therethrough, and the magnetic permeability of aluminum is very low, so that a higher magnetic field intensity can be obtained in the pipe 331 .

The windings 332 are respectively wound outside the aluminum pipe 331 and are made of copper wires with a diameter of about 1.0mm coated with insulating varnish. Each winding 332 is set independently of each other, and is controlled by a corresponding magnetizing current output module 335, wherein the current varies according to system requirements. Since each coil of winding 332 is independent of each other, the lead-out end will cause the current loop formed by the coil to be not a real "circle", but have a gap, which will cause the radial distribution of the magnetic field in the aluminum pipe 331 to be uneven, thereby affecting Magnetizing effect. To solve this problem, each turn of winding 332 in this invention is composed of forward winding 336 and reverse winding 337, the purpose of which is to generate magnetic fields in the same polarity direction and at the same time make up for the unbalanced magnetic field caused by the gap. The currents in the positive and negative windings are equal. There are multiple pairs of forward and reverse windings arranged in the axial direction of the aluminum pipe 331, and different currents are passed to form the non-uniform magnetic field required above.

The iron shell 333 covers the aluminum pipe 331 , and the iron material will shield most of the magnetic flux. The flange 334 is welded to both ends of the aluminum pipe 331 and is inserted into the U-shaped pipe 20 through the flange 334 .

Each magnetizing current output module 335 is connected to a winding 332, which utilizes the characteristics of the digital potentiometer to modify the resistance value in real time to realize the real-time control of the non-uniform magnetic field. The schematic circuit diagram of the magnetizing current output module 335 can be seen in the accompanying drawing 5, and the digital potentiometer used in it is AD5206, which has 6-channel output. The operational amplifier AD8601 and the MOS transistor 2N7002 realize the high-precision voltage follower output through negative feedback. The constant high current output adopts OPA 549, a high voltage and high current op amp from Texas Instruments (TI).

The adsorption module 34 is used to adsorb the magnetically aggregated large particles magnetized by the magnetization module 33, and it can adopt a homopolar adjacent type adsorption ring, which is composed of an aluminum ring pipe 341, a forward spiral Tube 342, reverse solenoid 343 and iron magnetic permeable cap 344 and other components. Wherein, the forward solenoid 342 and the reverse solenoid 343 are respectively arranged in the aluminum annular pipe 341, and the two are passed with currents in opposite directions, so that the forward solenoid 342 and the reverse solenoid 343 are in phase. Neighbors generate same-sex magnetic poles. The iron magnetic permeable cap 344 is arranged on the inner wall of the aluminum ring pipe 341, which is located adjacent to the forward solenoid 342 and the reverse solenoid 343, and the forward solenoid 342 and the reverse solenoid The midpoint of the tube 343 axis.

The design principle of the adjacent-type adsorption ring of the same pole is as follows: the forward solenoid 342 and the reverse solenoid 343 are energized, and the adjacent forward solenoid 342 and reverse solenoid 343 are connected with opposite directions. The electric current makes the adjacent places of the forward solenoid 342 and the reverse solenoid 343 produce the same-sex magnetic poles; at the same time, the aluminum ring pipe 341 can improve the magnetic circuit, increase the magnetic field strength at the inner wall of the pipe, and strengthen the iron magnetic permeable cap 344's ability to capture and adsorb particles. The current of each forward solenoid 342 and reverse solenoid 343 can be changed according to the particle size and concentration of the particles, so as to obtain the best adsorption performance.

Further, the adsorption module 34 can also adopt a homopolar adjacent adsorption ring with an electric hammer. The homopolar adjacent adsorption ring with an electric hammer is composed of an aluminum ring pipe 341, a forward solenoid 342, a reverse Composed of parts such as solenoid 343, iron magnetic permeable cap 344, partition 345, electric hammer 346 and electromagnet 347. Wherein, the forward solenoid 342 and the reverse solenoid 343 are respectively arranged in the aluminum annular pipe 341, and the two are passed with currents in opposite directions, so that the forward solenoid 342 and the reverse solenoid 343 are in phase. Neighbors generate same-sex magnetic poles. The iron magnetic permeable cap 344 is arranged on the inner wall of the aluminum ring pipe 341, which is located adjacent to the forward solenoid 342 and the reverse solenoid 343, and the forward solenoid 342 and the reverse solenoid The midpoint of the tube 343 axis. The electric hammer 346 and the electromagnet 347 are located between the partitions 345 . The electromagnet 347 is connected to and can push the electric hammer 346 so that the electric hammer 346 strikes the inner wall of the aluminum annular pipe 342 .

The design principle of the same-polarity-adjacent adsorption ring of the electrified hammer is as follows: the forward solenoid 342 and the reverse solenoid 343 are energized, and the adjacent forward solenoid 342 and reverse solenoid 343 are connected to each other. There are currents in opposite directions, so that the adjacent positions of the forward solenoid 342 and the reverse solenoid 343 produce the same-sex magnetic poles; at the same time, the aluminum ring pipe 341 can improve the magnetic circuit, increase the magnetic field strength at the inner wall of the pipe, and strengthen the magnetic field. The ability of the mass permeable magnetic cap 344 to capture and adsorb particles. The current of each forward solenoid 342 and reverse solenoid 343 can be changed according to the particle size and concentration of the particles, so as to obtain the best adsorption performance. And through the setting of the electric hammer 346, prevent particles from accumulating in large quantities at the ferrous magnetic permeable cap 344, which affects the adsorption effect. At this time, the electric hammer 346 is controlled by the electromagnet 347 to strike the inner wall of the pipe 341, so that the adsorbed particles are scattered to both sides. At the same time, when cleaning the pipeline 341, the knocking of the electric hammer 346 can also improve the cleaning effect.

The adsorption module 34 is designed to be U-shaped. When the oil liquid enters the U-shaped adsorption pipeline, the particles move to one side of the pipe wall under the action of gravity and centrifugal force. With the action of magnetic field force, the radial movement speed is accelerated, and the particles The efficiency of adsorption is improved; when the oil leaves the U-shaped adsorption pipe and rises, the resultant force of gravity and magnetic force makes the particles move in an oblique downward direction, which prolongs the force time of the particles and improves the efficiency of particle adsorption.

The degaussing module 35 degausses the magnetized particles to prevent residual magnetic particles from entering the hydraulic circuit through the oil inlet pipe of the oil return barrel and causing damage to the pollution-sensitive hydraulic components.

The U-shaped particle separation module 3 and the upper part of the oil return cylinder 7 are connected through an oil return cylinder oil inlet pipe 22; after being processed by the U-shaped particle separation module 3, the oil near the wall of the U-shaped pipe 31 is rich in aggregated particles, After entering the oil return cylinder 7 through the oil return cylinder oil inlet pipe 22, it flows back to the oil tank.

The bottom of the oil return cylinder 7 is provided with a relief valve 2, and the bottom of the relief valve 2 is provided with an electric control adjustment screw 9; the relief valve 2 is provided with an oil discharge port 10, and the oil discharge port 10 passes through the pipeline 20 is connected to an oil tank 11.

The inner barrel 15 is placed in the outer barrel 19 , which is installed on the end cover 25 through a top plate 13 and several bolts 21 . The spiral flow channel 17 is accommodated in the inner cylinder 15, and is connected to the U-shaped particulate separation module 3 through an inner cylinder oil inlet pipe 12. Specifically, the inner cylinder oil inlet pipe 12 is tangent to the spiral flow channel 17 connect. The oil in the center of the U-shaped pipe 31 only contains a small amount of small particles, and enters the inner cylinder 15 through the inner cylinder oil inlet pipe 12 to achieve high-precision filtration, thereby realizing the separation of solid particles. Further, the oil inlet pipe 12 of the inner cylinder is located in the oil inlet pipe 22 of the oil return cylinder, and extends into the center of the U-shaped particle separation module 3, and its diameter is smaller than that of the oil inlet pipe 22 of the oil return cylinder, and is connected with the oil inlet pipe 22 of the oil return cylinder. coaxial setting.

Further, the bottom of the inner cylinder 15 is in the shape of a rounded table, which is connected to the oil return cylinder 7 through an inner cylinder oil discharge pipe 23 , and an electric control check valve 24 is provided on the inner cylinder oil discharge pipe 23 . A hollow cylinder 16 is vertically provided in the center of the inner cylinder 15 , and a differential pressure indicator 14 is provided above the hollow cylinder 16 , and the differential pressure indicator 14 is mounted on an end cover 25 .

The filter element 18 is arranged on the inner wall of the inner cylinder 15, and its precision is 1-5 microns.

The bottom of the outer barrel 19 is provided with a hydraulic oil outlet 5 through which the filtered hydraulic oil is discharged.

In the present invention, due to the separation and polymerization of solid particles in the oil by the U-shaped particle separation module 3, in the oil at the outlet of the U-shaped particle separation module 3, the oil in the center only contains a small amount of small particle diameter particles. The oil flows from the oil inlet pipe 12 of the inner cylinder into the inner cylinder 15 for high-precision filtration; while the oil near the pipe wall is rich in aggregated particles, this part of the oil enters the oil return cylinder 7 through the oil inlet pipe 22 of the oil return cylinder, and then passes through the overflow The oil discharge port 10 of the flow valve 2 flows back to the oil tank 11, so that solid particles can be divided and filtered according to particle size. Here, the oil return cylinder 7 and the overflow valve 2 play the role of the aforementioned coarse filtration, thereby saving the number of filters and reducing the system cost and complexity. The electronically controlled adjusting screw 9 of the overflow valve 2 is used to adjust the overflow pressure, and its pressure is adjusted to be slightly lower than the pressure at the filter outlet to ensure the filter flow of the inner cylinder 15.

In addition, the traditional filter mainly adopts the filter cake filtration method. When filtering, the filtrate flows perpendicular to the surface of the filter element. The intercepted solid particles form a filter cake and gradually thicken, and the filtration speed gradually decreases until the filtrate stops flowing out. the service life of the filter element. In the present invention, the filtrate carrying small particles from the oil inlet pipe 12 of the inner cylinder flows into the spiral channel 17 of the inner cylinder 15 in a tangential inflow mode, and the wall of the inner cylinder 15 on the side of the spiral channel 17 is a high-precision filter element 18, The filtrate clings to the surface of the filter element 18 under the action of centrifugal force, the filtrate flows quickly parallel to the surface of the filter element 18, and the filtered hydraulic oil flows out to the outer cylinder 19 perpendicular to the surface of the filter element 18, and the two flow directions are perpendicular to each other. Therefore, it is called cross-flow filtration. The rapid flow of the filtrate exerts a shearing and sweeping effect on the particles accumulated on the surface of the filter element 18, thereby inhibiting the increase in the thickness of the filter cake, making the filtration speed nearly constant, and the filtration pressure will not increase with the passage of time. The service life is thus greatly improved. With the accumulation of filtration time, the pollution particles deposited on the bottom of the rounded platform of the inner cylinder 15 gradually increase, the filtration speed decreases slowly, and the unfiltered filtrate in the inner cylinder 15 rises along the hollow cylinder 16 in the center. At this time, the differential pressure indicator 14 works to monitor its pressure change, that is, the blockage of the filter element 18 at the bottom of the inner cylinder 15. If it exceeds the threshold, adjust the electric control adjustment screw 9 to reduce the overflow pressure, and open the check valve 24 at the same time to make the bottom of the inner cylinder 15 The filtrate containing more polluted particles is discharged to the oil return cylinder 7 through the inner cylinder oil discharge pipe 23 under the action of pressure difference, which avoids the deterioration of the clogging condition of the bottom filter element 18, thereby prolonging the service life of the filter element 18.

The process steps of using the above-mentioned oil filter device to treat the return hydraulic oil are as follows:

1), the oil in the hydraulic pipeline passes through the filter 8, and the filter 8 attenuates the pulsating pressure of the high, medium and low frequency bands in the hydraulic system, and suppresses the flow fluctuation;

2), the hydraulic oil enters the temperature control module 32 of the U-shaped particle separation module 3, adjusts the oil temperature to the optimum magnetization temperature of 40-50°C through the temperature control module 32, and then enters the magnetization module 33;

3), through the magnetization module 33, the metal particles in the oil are magnetized in the magnetic field, and the micron-sized metal particles are aggregated into large particles; then enter the adsorption module 34;

4), through the adsorption module 34 to adsorb the magnetic polymer particles in the return oil; then enter the degaussing module 35;

5), eliminate the magnetism of the magnetic particles by the degaussing module 35;

6), the oil near the wall of the U-shaped particulate separation module 3 enters the oil return cylinder 7 through the oil return tube inlet pipe 22 and then returns to the oil tank, while the oil in the center of the pipeline containing a small amount of small particle size particles enters through the inner cylinder. The oil pipe 12 enters the inner cylinder 15 for high-precision filtration;

7), the oil carrying small particle size particles flows into the spiral flow channel 17 of the inner cylinder 15 in a tangential inflow manner, and the oil flows close to the filter element under the action of centrifugal force, and performs high-precision filtration;

8), the high-precision filtered oil is discharged into the outer cylinder 19, and discharged through the hydraulic oil outlet 5 at the bottom of the outer cylinder 19.

The specific implementation above is only a preferred embodiment of this creation, and is not intended to limit this creation. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of this creation should be included in this creation. within the scope of protection.

Claims (10)

1. A filtering method that adopts full-band variable structure filtering, magnetization and adsorption, is characterized in that: it adopts a filter box, and the filter box includes a base plate, a filter, a U-shaped particle separation module, an oil return cylinder, and an inner cylinder , spiral flow channel, filter element, outer barrel and end cap; wherein, the filter, U-shaped particle separation module, oil return cylinder, and outer barrel are placed on the bottom plate in sequence; the filter includes an input pipe, a casing, and an output pipe , S-type elastic thin-walled, H-type filter and series-connected H-type filter; wherein, the input pipe is connected to one end of the casing, which is connected to a hydraulic oil inlet; the output pipe is connected to the other end of the casing, and It is docked with the U-shaped particle separation module; the S-shaped elastic thin wall is installed in the outer casing along the radial direction of the outer casing, and an expansion cavity and a contraction cavity are formed in it; the input pipe, the output pipe and the S-shaped elastic thin wall jointly form an S-shaped Cavity filter; the S-shaped elastic thin-walled shaft is evenly opened with a number of tapered variable structure damping holes; the tapered variable structure damping hole is composed of a tapered elastic damping hole tube and a slot hole; the S-shaped elastic A series resonance volume I and a parallel resonance volume are formed between the thin wall and the shell; a series resonance volume II is arranged on the outside of the series resonance volume I, and between the series resonance volume I and the series resonance volume II Connected through a tapered insertion tube; the H-type filter is located in the parallel resonance cavity, which communicates with the tapered variable structure damping hole; the series H-type filter is located in the series resonance cavity I and the series resonance cavity II Inside, it is also connected with the tapered variable structure damping hole; the H-type filter and the series H-type filter are axially symmetrically arranged, and form a series-parallel H-type filter; the U-type particle separation module includes a U A temperature control module, a magnetization module, an adsorption module, and a degaussing module are sequentially installed on the U-shaped tube; the U-shaped particle separation module and the upper part of the oil return cylinder are connected through an oil return cylinder oil inlet pipe; the inner cylinder is placed In the outer barrel, it is installed on the end cover through a top plate and several bolts; the spiral flow channel is accommodated in the inner cylinder, and it is connected with the U-shaped particle separation module through an inner cylinder oil inlet pipe; the inner cylinder The oil inlet pipe is located in the oil inlet pipe of the oil return cylinder, and extends into the center of the U-shaped particle separation module. On the inner wall; the bottom of the outer barrel is provided with a hydraulic oil outlet; It includes the following steps: 1), the oil in the hydraulic pipeline passes through the filter, and the filter attenuates the pulsating pressure of the high, medium and low frequency bands in the hydraulic system, and suppresses the flow fluctuation; 2), the hydraulic oil enters the temperature control module of the U-shaped particle separation module, adjusts the oil temperature to the optimum magnetization temperature of 40-50°C through the temperature control module, and then enters the magnetization module; 3), through the magnetization device, the metal particles in the oil are magnetized in the magnetic field, and the micron-sized metal particles are aggregated into large particles; then enter the adsorption module; 4), through the adsorption module to absorb the magnetic polymer particles in the return oil; then enter the degaussing module 35; 5), eliminate the magnetism of magnetic particles through the degaussing module; 6), the oil near the tube wall of the U-shaped particle separation module enters the oil return tube through the oil return tube inlet pipe and then returns to the oil tank, while the oil in the center of the pipeline containing trace small particles enters the inner tube through the oil inlet tube of the inner tube. Cartridge for high-precision filtration; 7) The oil carrying small particles flows into the spiral channel of the inner cylinder in a tangential flow, and the oil flows close to the filter element under the action of centrifugal force, and is filtered with high precision; 8), the high-precision filtered oil is discharged into the outer cylinder, and discharged through the hydraulic oil outlet at the bottom of the outer cylinder. 2. the filter method that adopts full-band variable structure filter, magnetization and adsorption as claimed in claim 1, is characterized in that: the axis of described input pipe and output pipe are not on the same axis; The widest part is located in the series resonant cavity I and the parallel resonant cavity, and its taper angle is 10°; the Young's modulus of the tapered elastic damping hole tube with tapered deformation structure is higher than the Young's modulus of the elastic thin wall Large, can be stretched or compressed with the change of fluid pressure; the Young's modulus of the slit hole is larger than that of the tapered elastic damping hole tube, and can be opened or closed with the fluid pressure; the opening of the tapered insertion tube is smaller The wide part is located in the series resonance cavity II, and its taper angle is 10°. 3. The filtering method adopting full-band variable structure filtering, magnetization and adsorption as claimed in claim 1, characterized in that: the temperature control module includes a heater, a cooler and a temperature sensor; Chongqing Jinhong's lubricating oil heater; the cooler is a surface evaporative air cooler, and the finned tube of the cooler is a KLM type finned tube; the temperature sensor is a platinum resistance temperature sensor. 4. The filtering method adopting full-band variable structure filtering, magnetization and adsorption as claimed in claim 1, characterized in that: the magnetization device comprises aluminum pipes, several windings, iron shells, flanges and several magnetization current outputs module; wherein, the plurality of windings are respectively wound outside the aluminum pipe, and each winding is composed of a positive winding and a reverse winding; the iron shell is covered on the aluminum pipe; the flange is welded on both sides of the aluminum pipe terminals; each magnetizing current output module is connected to a winding. 5. The filtering method adopting full-band variable structure filtering, magnetization and adsorption as claimed in claim 1, characterized in that: the adsorption module specifically adopts a homopolar adjacent type adsorption ring, and the homopolar adjacent type adsorption ring includes Aluminum annular pipe, forward solenoid, reverse solenoid and iron magnetic permeable cap; the forward solenoid and reverse solenoid are respectively arranged in the aluminum annular pipe, and both have a The opposite current makes the same-sex magnetic poles adjacent to the forward solenoid and the reverse solenoid; the iron magnetic permeable cap is arranged on the inner wall of the aluminum ring pipe, which is located Adjacent solenoids, and midway between the forward and reverse solenoid axes. 6. The filtering method adopting full-band variable structure filtering, magnetization and adsorption as claimed in claim 1, characterized in that: the adsorption module specifically adopts the same polarity-adjacent adsorption ring of the electrified hammer, and the electrified hammer Adjacent homopolar adsorption rings include aluminum ring pipes, forward solenoids, reverse solenoids, iron magnetic caps, separators, electric hammers and electromagnets; the forward solenoids and reverse The solenoids are respectively arranged in the aluminum annular pipe, and the two have opposite currents, so that the adjacent parts of the forward solenoid and the reverse solenoid generate the same magnetic pole; the iron magnetic cap is arranged in the aluminum On the inner wall of the quality annular pipe, it is located at the adjacent position of the forward solenoid and the reverse solenoid, and at the middle point of the axis of the forward solenoid and the reverse solenoid; the partition is located at the forward solenoid between the pipe and the reverse solenoid; the electric hammer and the electromagnet are located between the partitions; the electromagnet is connected and can push the electric hammer, so that the electric hammer strikes the inner wall of the aluminum annular pipe. 7. The filtering method adopting full-band variable structure filtering, magnetization and adsorption as claimed in claim 1, characterized in that: the bottom of the oil return cylinder is provided with an overflow valve, and the bottom of the overflow valve is provided with an electronic control adjustment screw; the overflow valve is provided with an oil discharge port, and the oil discharge port is connected to an oil tank through a pipeline. 8. The filtering method adopting full-band variable structure filtering, magnetization and adsorption as claimed in claim 1, characterized in that: the bottom of the inner cylinder is in the shape of a rounded table, which is connected to the oil return cylinder through an inner cylinder oil discharge pipe , There is an electronically controlled check valve on the oil discharge pipe of the inner cylinder. 9. The filtering method adopting full-band variable structure filtering, magnetization and adsorption as claimed in claim 1, characterized in that: a hollow cylinder is vertically arranged in the center of the inner cylinder, and a differential pressure indicator is arranged above the hollow cylinder , the differential pressure indicator is installed on the end cover; the oil inlet pipe of the inner cylinder is connected tangentially to the spiral flow channel. 10. The filtering method using full-band variable structure filtering, magnetization and adsorption as claimed in claim 1, characterized in that: the precision of the filter element is 1-5 microns.