JPH0427528Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a fluid filtration device used to filter lubricating oil for vacuum pumps and to remove impurities from liquids and gases.

[Conventional technology]

Conventional methods for removing impurities from a fluid include the filter method, in which the fluid is pumped toward a filter and the impurities are filtered out by the filter, and the centrifugal separation method, in which the impurities are caused to collide with a cylindrical wall surface using centrifugal force and settle. Mainly used. Furthermore, as a method using an adsorbent, there is an apparatus that uses a method in which a fluid is passed through contact with an adsorbent, and impurities are adsorbed by the adsorbent.

[Problem that the invention attempts to solve]

However, in the removal of impurities by the filter method or centrifugation method as described above, micro-order colloids, such as those with water content in oil of 50 ppm or less or oil content in wastewater of 15 ppm or less, are required in recent years. It is technically impossible to remove particles, and even if it were possible, it would be unprofitable in terms of cost and not suitable for practical use.

In addition, in devices using adsorbents, only the low adsorption potential that the adsorbent's adsorption pore surface inherently has acts as adsorption force, so the adsorption capacity is not sufficient and the saturated adsorption amount of the adsorbent is also low. There was a problem.

The present invention was devised in view of the above-mentioned problems, and it is an object of the present invention to provide a fluid filtration device that is capable of removing micro-order colloid particles with a relatively simple structure.

[Means for solving problems]

In order to achieve the above object, the present invention provides a cylindrical container made of a conductive material with an open top surface, a fluid inlet on the side of the container, and a rod-shaped center electrode in the center of the bottom plate of the container for electrical conduction with the container. A first insulating plate is placed on the bottom plate of the container via a bushing, and a gap is formed between the center electrode and the upper end thereof extends from the upper end of the center electrode. A cylindrical filter made of an exposed dielectric material is disposed around the first suction cylinder, and the adsorption cylinder is provided with an adsorbent formed in a cylindrical shape between the inner circumferential surface of the container and the filter.
The filter is disposed on an insulating plate, a removable lid is provided on the container, the filter is supported between the lid and the first insulator, and the filter is supported between the lid and the upper surface of the suction tube. a second annular insulator is interposed in the lid body, a clean fluid outlet is formed at a position corresponding to the hollow part of the cylindrical filter, a drain is provided near the lower end of the side surface of the container, and a drain is provided near the lower end of the side surface of the container; Further, a voltage applying means is provided for applying a voltage between the center electrode and the adsorption cylinder, which are in electrical continuity with the center electrode.

[Effect]

The fluid filtration device according to the present invention introduces an unpurified fluid into a container, and applies a voltage between the adsorption tube and the center electrode. The fluid sent to the outlet through a filter is precisely filtered, and impurities with relatively large particles and heavy specific gravity in the fluid are brought to a zeta potential on the surface of the adsorption cylinder by the voltage applied between the container and the adsorption cylinder. is negated and coagulates and precipitates due to the Van der Juaars force, and the impurities that do not precipitate are adsorbed to the adsorption pore surface by a strong Coulomb force as the potential of the adsorption pore surface of the adsorbent is strengthened compared to the original potential. On the other hand, due to the voltage applied between the adsorption cylinder and the center electrode, a zeta potential is generated between the impurity surface and the liquid, and the impurity is attracted by the Coulomb force to the polarized filter surface placed in the electric field, and the impurity is attracted to the filter surface. A cake layer is formed on the surface, and the remaining particles are filtered through this cake layer.

〔Example〕

Hereinafter, the present invention will be described in detail based on illustrated embodiments.

In the figure, a container 1 made of a conductor has a cylindrical shape with an open top, and a flange 1a is formed at the open end edge. As shown in FIG. 1, a fluid inlet 2 for pressurizing fluid into the container 1 is formed on the side surface of the container 1 above the center, and a fluid inlet 2 is formed near the lower end of the container 1. A drain 3 is provided for discharging impurities settled therein. In addition, 4
is the sensor insertion port of the pressure gauge switch (not shown),
It is provided at the center of the side surface below the fluid inlet 2.

On the bottom plate 1b of the container 1, as shown in FIG.
A rod-shaped center electrode 5 is erected at its center. The center electrode 5 passes through the bottom plate 1b and is fixed to the bottom plate 1b by welding, so that the container 1 and the center electrode 4 are electrically connected. Further, the height of the center electrode 5 is set such that its upper end is located below the opening surface of the container 1.

A disk-shaped first insulating plate 7 is placed on the bottom plate 1b of the container 1 with a bushing 6 interposed therebetween. The first insulating plate 7 has a through hole 7a for the center electrode 5 formed in the center thereof, and an annular suction tube mounting portion 7b is recessed near the outer periphery of the upper surface. A filter support base 8 is fixed to the inner peripheral side of the mounting portion 7b. Note that this filter support stand 8 may be formed integrally with the first insulating plate 7. Moreover, 8a is a claw for fixing the filter which is provided protrudingly from the filter support base 8.

A cylindrical filter 9 made of a dielectric is placed on the filter support stand 8 . This filter 9
By being placed on the filter support base 8 in this way, it is placed around the center electrode 5, but a gap x is formed between it and the center electrode 5, and The upper end extends from the upper end of the center electrode 5 and reaches a position slightly protruding from the opening surface of the container 1.

A suction cylinder mounting portion 7 recessed in the first insulating plate 7
An adsorption column 10 equipped with an adsorbent 11 is placed on b, so that the adsorption column 10 is disposed between the inner peripheral surface of the container 1 and the filter 9. The adsorption cylinder 10 shown in this embodiment includes a cylindrical adsorbent 11, a porous cassette 12 made of a conductive material that encloses the adsorbent 11, and covers the outer and inner peripheral surfaces of the porous cassette 12. It consists of mesh bodies (wire mesh) 13 and 14 made of a conductive material. The porous cassette 12
The upper surface 12a has an engaging portion 1 for drawing out the cassette.
2aa and 12aa are formed, and the porous cassette 12 can be easily pulled out from the container 1 by hooking the engaging portion of a drawer (not shown) to these engaging portions 12aa and 12aa. Also,
Upper surface 12a and lower surface 12b of porous cassette 12
can be attached or detached from the main body of the porous cassette 12 by operating the mounting screws 12ab or 12bb, respectively, thereby making it possible to take out the adsorbent 11 inside. It should be noted that the adsorbent used is one whose adsorption pore surface potential is opposite in polarity to the surface charge of the impurity or the like to be removed. In the case of gases, carbon-based adsorbents; in the case of wastewater systems, activated clay-based, zeolite-based, activated alumina-based adsorbents, or mixtures thereof; in the case of water-based systems, adsorption of activated carbon-based, zeolite-based, or mixtures thereof; Agents are preferably used.

A lid 15 that closes the opening of the container 1 is detachably attached to the flange 1a of the container 1 with bolts 16. A filter support portion 15a is recessed in the center of the back side of the lid 15, and when the opening of the container 1 is closed with the lid 15, the filter 9 is The filter is supported between the first insulating plates 7 via a filter support stand 8 . Incidentally, reference numeral 15aa denotes a claw for fixing the filter, which is provided in a protruding manner on the filter support base 8. Further, an annular second pipe is provided between the lid body 15 and the upper surface of the adsorption cylinder 10.
An insulator 17 is interposed to prevent short circuit between the lid 15 and the adsorption tube. Further, a clean fluid outlet 18 is formed in the center of the lid 15 corresponding to the hollow part of the filter 9. In addition, 19 is the lid body 1
This is the handle number 5.

As shown in FIG. 5, the bottom plate 1b of the container 1 is provided with a pair of through holes 1ba and 1bb, into which bushings 20 and 21 are fitted, respectively. Insulating bushings 22 and 2 are fitted into these through holes 1ba and 1bb with bushings 20 and 21, respectively.
Electrode rods 24 and 25 coated with 3 are inserted. The tips of these electrode rods 24 and 25 are connected to the first
It passes through the insulating plate 7 and the suction cylinder 10, and contacts the leaf springs 26 and 27 provided on the lower surface 12b of the porous cassette 12 by pressing them. The electrode rod 24 is used as a voltage supply terminal for applying voltage to the suction tube 10, while the electrode rod 25 is connected to a confirmation lamp or the like for checking whether or not the suction tube 10 is energized. .

The voltage source 28 that supplies DC or DC and AC weight voltage has one terminal connected to the container 1 and the other terminal connected to the electrode rod 24, as shown in FIG. By connecting the container 1 and the adsorption cylinder 10 and the adsorption cylinder 10 and the center electrode 5
A voltage is applied between them. That is, the container 1 and the electrode rod 24 constitute a voltage applying means 29. still,
30 is a leg fixed to the bottom plate 1b of the container 1.

The fluid filtration device configured as described above pumps the untreated fluid into the container 1 from the fluid inlet 2, and supplies voltage to the voltage applying means 29 made up of the container 1 and the electrode rod 24 by the voltage source 28. used by

When a voltage is applied between the container 1 and the adsorption cylinder 10 by supplying the above-mentioned voltage, impurities with relatively large particles in the fluid are attracted to the adsorption cylinder 10 by Coulomb force, and the zeta potential around the adsorption cylinder 10 increases. is erased and coagulates and settles due to the force of Fardelf.
Unagglomerated impurities are transferred to adsorbent 1 by pressure.
The adsorbent 1 passes through the porous cassette 12 and has its surface potential strengthened by applying a voltage to the porous cassette 12.
Adsorbs into the suction hole No. 1 with strong Coulomb force.

On the other hand, when a voltage is applied between the suction cylinder 10 and the center electrode 5 by supplying a voltage to the voltage applying means 29, the filter 9 placed in the electric field is polarized. Therefore, impurities such as colloidal particles remaining in the fluid that has passed through the adsorption cylinder 10 gather on the outer periphery of the filter 9 due to the Coulomb force due to the polarization of the filter 9 and the pump pressure, and lose their zeta potential. , are aggregated by Van der Farls force, and a cake layer of the aggregates is formed on the surface of the filter 9. The colloidal particles forming this cake layer are aggregated around the openings of the filter 9 to make the openings of the filter 9 smaller.
This cake layer has a much higher filtration accuracy than the filter 9 originally has, and blocks the passage of impurities and captures residual particles. Moreover, since the filter 9 is polarized, the colloidal particles will definitely aggregate on the surface of the filter 9 and will not enter the inside.
The filter 9 will no longer be clogged.

As described above, the fluid filtration device precisely filters even extremely fine impurities on the micron order.

In addition, the voltage supplied to the voltage application means is a DC voltage of 1000 to 3000 V/cm when the fluid is a gas, a DC voltage of 10 to 200 V/cm when the fluid is a non-aqueous liquid, and a DC voltage of 1 when the fluid is a water-based liquid. A DC voltage of ~20 V/cm or a weight voltage of AC and DC is preferably used. However, the selection of the type of voltage and the selection of the voltage value are appropriately determined depending on the electric resistance specific to the fluid, and are preferably selected experimentally. Therefore, the type of voltage and voltage value are not necessarily limited to those shown above.

In addition, by adding a polarity switch to the voltage source, when the adsorbent reaches a saturated state, the polarity of the container and adsorption cylinder is changed, and a Coulomb force opposite to the Coulomb force during adsorption is applied to the adsorbent. It is also possible to discharge adsorbed impurities.

Furthermore, if the adsorbent is a conductive adsorbent such as a carbon-based adsorbent, the adsorption pores can be closed by applying a voltage directly to the adsorbent without having to enclose the adsorbent in a porous cassette made of a conductive material. It is also possible to enhance the surface potential.

In addition, the flow rate at which the fluid is introduced into the fluid inlet port is determined depending on the viscosity of the fluid.

[Effect of idea]

As is clear from the above explanation, according to the fluid filtration layer of the present invention, among the impurities in the fluid sent into the container, impurities with relatively large particles and high specific gravity are first coagulated and sedimented, and then the adsorption holes An adsorbent with enhanced surface potential adsorbs and removes low-molecular impurities more reliably than before, and a filter polarized in an electric field filters remaining particles with extremely high precision, making it extremely effective in removing impurities. will be removed. In addition, a cake layer is formed on the surface of the filter, and this cake layer filters out remaining particles, so even if the accuracy of the filter itself is not very high, precise filtration can be achieved.Moreover, since the filter is polarized, colloidal particles can be filtered out. It aggregates on the surface of the filter and does not enter the interior, preventing clogging of the filter.

Furthermore, by removing the lid from the container, the suction tube and filter can be easily taken out, making maintenance easy.

[Brief explanation of drawings]

Fig. 1 is an explanatory diagram showing the external configuration of the fluid filtration device according to the present invention, Fig. 2 is a longitudinal sectional view, Fig. 3 is a sectional view taken along line A-A in Fig. 2, and Fig. 4 is a perspective view of an adsorption cylinder. , FIG. 5 is an explanatory view showing the main part of the BB cross section in FIG. 2. DESCRIPTION OF SYMBOLS 1... Container, 2... Fluid inlet, 3... Drain, 5... Center electrode, 6... Butching, 7...
First insulating plate, 9...filter, 10...adsorption tube,
15...Lid body, 17...Second insulating plate, 18...Clean fluid delivery port, 29...Voltage application means.

Claims (1)

[Scope of claims for utility model registration] (1) A cylindrical container with an open top made of a conductor is provided,
A fluid inlet is formed in the side surface of the container, a rod-shaped center electrode is provided upright at the center of the bottom plate of the container in electrical continuity with the container, and a first insulating plate is placed on the bottom plate of the container via a bushing. A cylindrical filter made of a dielectric material is provided around the center electrode, and a gap is formed between the center electrode and the center electrode, and the upper end thereof extends from the upper end of the center electrode. An adsorption cylinder having a cylindrical adsorbent formed between the filters is placed on the first insulating plate, a removable lid is provided on the container, and the lid and the first The filter is supported between insulators, a second annular insulator is interposed between the lid body and the upper surface of the suction cylinder, and a cleaning fluid is placed in the lid body at a position corresponding to the hollow part of the cylindrical filter. A discharge port is formed, a drain is provided near the lower end of the side surface of the container, and a voltage applying means is provided for applying a voltage between the container, the center electrode in electrical conduction with the container, and the suction cylinder. Fluid filtration device. (2) The fluid filtration device according to claim 1, wherein the adsorption column is made of only an adsorbent. (3) The fluid filtration device according to claim 1, wherein the adsorption tube comprises an adsorbent and a porous cassette made of a conductive material that encloses the adsorbent. (4) The fluid filtration device according to claim 1, wherein the adsorption cylinder is composed of an adsorbent and a mesh body made of a conductive material that encloses the adsorbent. (5) A request for registration of a utility model characterized in that the adsorption cylinder consists of an adsorbent, a porous cassette that encloses the adsorbent, and a mesh made of a conductive material covering the surface of the porous cassette. A fluid filtration device according to scope 1.