JPH0131427B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a liquid filtration device used, for example, for filtering lubricating oil of a vacuum pump.

[Conventional technology]

FIG. 3 shows a conventional liquid filtration device. In the figure, a container 1 includes a container part 1a having an inlet 2 and made of a conductor, and a lid part 1c having an outlet 3 covering an opening 1b of the container part 1a. It is equipped with One end surface of the filter 4 is attached to the lid part 1c, and after filtering the liquid introduced into the container 1 through the inlet 2, the filter 4 is sent out of the container 1 through the outlet 3. The electrode 5 is attached to the lid part 1c via an insulator 501, and has a cylindrical shape so that the filter 4 can be inserted inside. The voltage applying means 6 is constituted by the outer periphery of the container portion 1a and the electrode 5, and applies a voltage to the liquid in the container 1.

Next, the operation will be explained. A voltage is applied to the liquid introduced into the container 1 from the inlet 2 as shown by arrow A by the voltage applying means 6. For this reason, impurities in the liquid are ionized, the electric double layer is destroyed, or the zeta potential of the electric double layer is neutralized, and the impurities electrostatically aggregate and become larger, and are filtered by the filter 4. , are sent out of the container 1 from the delivery port 3 as shown by arrow B.

[Problem that the invention seeks to solve]

In the above-mentioned filtration device, when the liquid is lubricating oil for a vacuum pump, for example, the impurities in the liquid are as fine as micro-order, and the impurities are electrostatically aggregated and become larger until they are filtered by the filter 4. To,
There was a problem that required a long time. Further, when gas is mixed into the liquid, there is a problem that the gas cannot be removed.

This invention was made to eliminate such problems, and it filters impurities in liquid in a short time.
The adsorbent strongly adsorbs impurities such as gas and facilitates waste treatment after filtration.

[Means for solving problems]

The liquid filtration device according to the present invention includes a delivery port made of a conductive pipe inserted through a lid and a filter, and a porous body or mesh whose one end face is attached to the lid insulated from the delivery port and into which the filter is inserted. a cylindrical first electrode made of a cylindrical body; one end surface is attached to the lid at the same potential as the first electrode;
A cylindrical second electrode made of a porous body or a mesh body into which the first electrode is inserted is inserted through one end of the outlet, and is directly or A device comprising: a bottom plate installed in indirect contact; a voltage applying means consisting of a container portion, first and second electrodes, and a delivery port; and an adsorbent sealed between the first and second electrodes. It is.

[Effect]

In this invention, by the voltage application means,
It ionizes impurities in the liquid, destroys the electric double layer, or neutralizes the zeta potential of the electric double layer, causing the impurities to electrostatically condense, and at the same time, between the first and second electrodes at the same potential. Impurities such as gas are adsorbed to the encapsulated adsorbent with enhanced charging effect,
Alternatively, by electrostatically adsorbing impurities on the filter and configuring the first and second electrodes with porous or mesh materials, gas can be prevented from accumulating in the container, and by removing the lid from the container. , adsorbent, and filter waste treatment all at once.

〔Example〕

FIG. 1 shows an embodiment of the liquid filtration device according to the present invention. In the figure, a taper 1d is formed on the bottom surface of the container portion 1a, and a first groove is formed at the bottom of the side surface of the container portion 1a, communicating with the taper 1d. A drain 1e is provided. A second drain 1f is installed in the lid part 1c.
is provided, and an electrode connection conductor 1h connected to a sealed container 5C, which will be described later, is inserted through an insulator 1g. Bolts 1i attach the container portion 1a to the lid portion 1c. The outlet port 3A is made of a conductive pipe, and is inserted through the lid part 1c and a filter 4A made of an insulating dielectric material whose one end surface is attached to the lid part 1c, and has one end part 3a protruding from the other end surface of the filter 4A. are closed by a fitting 8 which is a cap nut to be described later, and through holes 3b are evenly bored in the inside of the filter 4A. The first electrode 5A is made of a porous or mesh material and has a cylindrical shape, and accommodates the filter 4A.
One end surface thereof is attached to the lid portion 1c via an insulator 5x, and connected to the electrode connector 1h.
The second electrode 5B is made of a porous or mesh material and has a cylindrical shape, houses the first electrode 5A, and has one end surface attached to the lid part 1c via an insulator 5x. Electrode connection conductor 1 at the same potential as
connected to h. The sealed container 5C has the first and second electrodes 5 so as to form a cylindrical hollow part 5D.
It is constructed by closing both end faces of A and 5B. The voltage applying means 6A consists of a container portion 1a, first and second electrodes 5A, 5B, and an outlet 3A. The bottom plate 7 is made of an insulating material, for example, and is installed through one end 3a of the outlet 3A and in contact with the other end surfaces of the filter 4A and the first and second electrodes 5A, 5B. The fitting 8 is, for example, a cap nut, and is screwed onto the outer periphery of one end 3a of the outlet 3A to close the one end 3a of the outlet 3A and attach the bottom plate 7 to the outlet 3A. Adsorbent 9
is, for example, zeoherb, sorbito, activated clay, etc., and is sealed between the first and second electrodes 5A and 5B, that is, in the hollow part 5D of the sealed container 5C. The transformer 10 connects the first and second electrodes via the electrode connection conductor 1h.
is connected between the electrodes 5A, 5B and the lid part 1c, and a voltage of, for example, 10 to 3000 V/cm is applied.

Next, the operation will be explained. A voltage is applied to the liquid introduced into the container 1 from the inlet 2 as shown by arrow A by the voltage application means 6A. Therefore, impurities with relatively large particles in the liquid sent between the container part 1a and the second electrode 5B are attracted by the Coulomb force to the second electrode 5B, and are transferred to the second electrode by electrophoresis.
The particles gather around the electrode 5B, the zeta potential is erased, and the particles aggregate and coarsen due to intermolecular attraction. Impurities having a specific gravity lower than that of the liquid float and separate as shown by arrow C, and are removed from the container 1 through the second drain 1f. Further, impurities having a specific gravity heavier than the liquid are separated by sedimentation as shown by arrow D, and are removed from the container 1 through the first drain 1e.

The liquid from which relatively large particle impurities have been removed is fed into the sealed container 5C by pressure as shown by the arrow E, and evenly contacts the adsorbent 9 sealed in the hollow part 5D. . In this case, the adsorbent 9
Ions on the pore surface of the first and second electrodes 5A, 5
This is reinforced by the electrification of B, and gas, water, and low-molecular impurities are adsorbed and removed by the adsorbent 9 by the Coulomb force of this ion.

On the other hand, a filter 4A made of an insulating dielectric material
A voltage is applied by the first electrode 5A and the outlet port 3A to charge a dielectric charge. For this reason,
After passing through the adsorbent 9, the colloidal particles and microparticles remaining in the liquid are attracted by the pump pressure and the dielectric charge of the filter 4A, and collect on the outer periphery of the filter 4A, and their zeta potential is erased, causing them to aggregate. , to capture any remaining particles. The liquid from which impurities have been filtered in this way is sent to the outlet 3A.
The liquid is delivered from the through hole 3b through the delivery port 3A to the outside of the container 1 as shown by arrow B.

In addition, the filter 4A, the adsorbent 9 and the first,
To replace the second electrodes 5A, 5B, remove the lid part 1c from the container part 1a, then remove the fastener 8, remove the bottom plate 7, and replace the filter 4A.
and the first and second electrodes 5A, 5B and the sealed container 5
Replace the adsorbent 9 in D.

In addition, since the first and second electrodes 5A and 5B are porous or mesh-like and the through-hole 3b is provided in the outlet 3A, the gas that is not adsorbed by the adsorbent 9 is absorbed into the container together with the liquid. 1 is discharged outside.

FIG. 2 shows another embodiment of the liquid filtration device according to the present invention, and in the figure, a first dielectric body 11a
is made of, for example, an insulator such as coarse mesh glass fiber, and is installed between the container portion 1a and the second electrode 5B. The second dielectric 11b is made of an insulator such as glass fiber with a fine mesh, and the second dielectric 11b is
and filter 4A. In this case, the voltage applying means 6A includes a container portion 1a, first and second electrodes 5A and 5B, an outlet 3A, and first and second dielectrics 11a and 11b.

In the case of the embodiment shown in FIG. 2, as in the embodiment shown in FIG.
It is filtered by an adsorbent 9 and a filter 4A. Further, since the first and second dielectrics 11a and 11b are charged with dielectric charges, impurities ionized by the voltage applying means 6A are immediately absorbed by the first and second dielectrics 11a and 11b. captured.

Therefore, the liquid, like lubricating oil for a vacuum pump,
Even when the impurities are as fine as micro-order,
It can filter effectively in a short time and can also adsorb gases in liquids. In addition, when the liquid has large impurities, such as cutting oil from a cutting machine, the first and second dielectrics 11a and 11b act as a filter, which greatly reduces clogging of the filter 4A. can.

In the above embodiment, the attachment 8 is a cap nut to close one end 3a of the outlet 3A, but the attachment 8 may be a nut with the one end 3a of the outlet 3A itself closed.

In addition, if the liquid is water-based such as cutting fluid,
The voltage applied at the transformer 10 may be 1 to 10 V/cm. Furthermore, depending on the type of adsorbent 9, the polarity of the voltage applied between the first and second electrodes 5A, 5B and the lid portion 1c may be selected.

[Effects of the Invention] As described above, according to the present invention, coarse impurities in a liquid sent into a container are attracted by a Coulomb force to a porous or mesh electrode, and are removed by coagulation. Then, an adsorbent placed between the electrodes strengthens the ions on the pore surface by applying a voltage.
Adsorbs and removes gas, water, and low-molecular impurities,
Furthermore, since colloidal particles and microparticles are aggregated and captured by the filter, impurities can be effectively removed and filter clogging can be significantly improved. Furthermore, since the lid part, the filter, the first and second electrodes, and the sealed container that stores the adsorbent are attached, waste disposal of the filter and adsorbent can be done all at once. It has an effect that can be done easily.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing one embodiment of the liquid filtration device according to the present invention, FIG. 2 is a sectional view showing another embodiment of the liquid filtration device according to the invention, and FIG. 3 is a conventional liquid filtration device. FIG. In the figure, 1 is a container, 1a is a container part, 1b is an opening, 1c is a lid part, 1d is a taper, 1c, 1
f is the first and second drains, 2 is the inlet, 3A is the outlet, 3a is one end, 3b is the through hole, 4A is the filter, 5A and 5B are the first and second electrodes, 5C is the sealed container , 5D is a hollow part, 6A is a voltage application means, 7
8 is a bottom plate, 8 is a fixture, 9 is an adsorbent, 10 is a transformer, and 11a and 11b are first and second dielectric bodies. Note that the same reference numerals in each figure indicate the same or corresponding parts.

Claims (1)

[Scope of Claims] 1. A container comprising a container portion having an inlet port and a lid portion covering an opening of the container portion, one end surface of which is attached to the lid portion, and a liquid fed into the container from the inlet port. A filter made of a dielectric material of an insulating material, which is inserted through the lid part into the filter, one end part protruding from the other end surface of the filter to the outside of the filter, and the part inside the filter is filtered by the filter. an outlet made of a conductive pipe having a through hole for sending liquid out of the container; a porous body having one end surface attached to the lid insulated from the outlet, and into which the filter is inserted; Alternatively, a cylindrical first electrode made of a mesh-like body, one end surface of which is attached to the lid portion insulated from the outlet port and at the same potential as the first electrode, and the first electrode is placed inside. a cylindrical second electrode made of a porous body or a mesh body to be inserted;
A bottom plate that is inserted through one end of the outlet and is attached to the one end of the outlet by a fixture, in direct or indirect contact with the other end surfaces of each of the first and second electrodes; a voltage applying means for applying a voltage to the liquid, comprising the container section, the first and second electrodes, and the outlet;
A liquid filtration device comprising an adsorbent sealed between second electrodes. 2. The voltage applying means is installed at least one of the container part, the first and second electrodes, the outlet, and between the container part and the second electrode, or between the first electrode and the filter. A liquid filtration device according to claim 1, comprising a dielectric material. 3. The dielectric material is a mesh material, and the coarse mesh dielectric material is installed between the container part and the second electrode, and the fine mesh dielectric material is installed between the first electrode and the filter. The liquid filtration device according to scope 2. 4. The liquid filtration device according to any one of claims 1 to 3, wherein one end of the outlet is closed by a fitting. 5. The bottom surface of the container part is tapered, and a first drain is provided at the lower side of the container part in communication with the taper to collect coarse impurities having a specific gravity heavier than the liquid captured by the second electrode. The liquid filtration device according to any one of claims 1 to 4, wherein the liquid is discharged from the first drain to the outside of the container. 6 A second drain is provided between the side surface of the container part of the lid part and the second electrode, and coarse impurities having a specific gravity lighter than the liquid captured by the second electrode are removed from the container from the second drain. A liquid filtration device according to any one of claims 1 to 5, which is configured to discharge the liquid to the outside.