JP2014200709A - Filter unit and wet classifier - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a wet classifier for efficiently sucking and separating a particle having dispersed in liquid together with the liquid via a mesh of a classification net, by using a filter unit for installing the classification net.SOLUTION: The wet classifier is provided for sucking and separating the particle smaller than the mesh together with the liquid by using the filter unit for installing the classification net. The wet classifier is equipped with a tuber pump and a pinch valve for preventing inconvenience by abrasion and sticking due to the particle, by providing a cutout for correctly installing an obverse-reverse of the classification net in the filet unit by preventing precipitation and the sticking of the particle by forming an outer peripheral surface of the filter unit in an angle shape, by removing clogging by supplying a cleaning liquid in the filet unit.

Description

The present invention relates to a filter (classification network) having fine particles from a group of fine particles dispersed in a liquid.
And a wet classifier using the filter unit.

In conventional wet classifiers, a filter unit equipped with a net used for classification is placed in a classification tank filled with a liquid containing particles for classification (Patent Document 1), or a container that does not use a filter unit is a container. A mesh for classification is attached to the bottom of the container, and a liquid containing particles for classification is placed in a container (Patent Document 2), and the liquid containing the particles passes through the mesh of these meshes, so that a group of particles smaller than the mesh of the mesh Is to be recovered.

JP 2012-148254 A JP 2002-35635 A

In the conventional apparatuses of Patent Document 1 and Patent Document 2, when the liquid containing the classified particles passes through the network, the liquid always flows in one direction with respect to the network, and particles larger than the mesh of the network The particles are clogged when they are pressed against the mesh because they cannot pass through the screen, and particles that are slightly larger than the mesh are clogged by the liquid flow. The effective working eyes of the net gradually decrease, and particles that should originally pass through the net become difficult to pass.

   In order to recover this situation, the operation of the apparatus is stopped, and in the apparatus provided with the filter unit (Patent Document 1), the filter unit is taken out of the liquid, and the particles closing the mesh are removed by some method. Therefore, it is necessary to frequently perform the work of resolving the clogging and replacing the filter unit in the liquid again to restart the operation of the apparatus, which is cumbersome and lowers the operating rate of the apparatus.

   Further, in order to recover this situation, in the case of a device in which a classification net is attached to the bottom of the container (Patent Document 2), all the liquid containing particles in the container is extracted from the container, and then the device is disassembled. After removing the mesh attached to the bottom and removing the clogging particles by some method, removing the clogging, reattaching the mesh to the bottom of the container and restarting the equipment frequently. Work is cumbersome and the operating rate of the apparatus is low.

Further, the structure of the filter unit described above includes a unit housing that defines a suction space for sucking liquid, the unit housing having a circular upper wall and a peripheral wall extending downward from a peripheral portion of the upper wall, The upper wall and the peripheral side wall define a suction space whose lower surface is released. A filter means (net) for classifying powder (particles) is detachably attached to the lower opening of the unit housing.
(Patent Document 1, paragraph 0028)
In addition, in the center of the upper wall of the unit housing, the liquid and particles that have passed through the net are sucked out from the filter unit to the outside of the device, and compared with the liquid containing particles outside the filter unit through the upper wall. A thin suction pipe is provided, and the outside of the upper wall is a plane parallel to the filter means (mesh).
Since this filter unit is submerged in the liquid containing particles for classification purposes so that the surface of the net is horizontal, some of the particles in the liquid settle and adhere to the upper outer surface of the filter unit. Since there is no contact, some of the particles that should originally pass through the net remain in the liquid and are not guided out of the apparatus.

In addition, as described above, the suction pipe for guiding the liquid and particles to the outside of the apparatus is located at the center of the filter unit. It works strongly, and the action becomes weaker as it is farther away from the position of the suction tube. Therefore, in the central part of the mesh surface, the speed of the liquid passing through the eyes is large, and particles slightly larger than the eyes enter the eyes strongly.
On the other hand, at the periphery of the mesh surface far from the suction tube, the speed of the liquid passing through the mesh is small and the particles cannot be sucked up sufficiently. Cannot use well.

  In addition, the meshes with fine meshes used in these classifiers are electronic meshes made by a method similar to plating and etching, and there is a slight difference in the fineness between the front and back sides of the meshes. There is a difference in the performance of the classification device depending on whether the front side or the back side of the mesh is directed against liquid containing particles for classification purposes, so the front and back are important requirements when attaching the net to the filter housing However, it is extremely difficult to distinguish the front and back with conventional nets, and there is a possibility that the front and back will be installed incorrectly.

  In addition, in a classification device having a classification tank and a filter unit, a liquid containing particles in the tank may be circulated in order to increase the chance that the particles for classification contact the surface of the net. Since the liquid tends to be a constant flow and it is not easy to bring the entire liquid into contact with the net surface uniformly, particles that should pass through the net of the filter unit cannot contact the net surface and may remain in the tank.

  In addition, it is essential to use a pump or a valve when guiding or circulating a liquid containing particles in the classifier described above, but in general, particles are abradable or sticky, and depending on the structure of the pump or valve, they may slide. Parts or pipes that come into contact with the liquid or liquid when it passes through, causing problems such as the occurrence of foreign matter from the pump or valve due to particles getting into the parts or rotating parts and wearing parts of the pump or valves. Particles adhere to the wall surface, and simple cleaning cannot remove the adhered particles completely, causing contamination.

  The present invention is intended to solve such a conventional problem. From a liquid in which fine particle groups are dispersed, particles smaller than the mesh of the mesh are efficiently separated and sucked using a net, and the particles are combined with the liquid. The present invention provides a filter unit for guiding to the outside, and a wet classifier using the filter unit.

  The present invention includes a unit housing composed of an upper wall surface defining a space for sucking a liquid, a peripheral wall extending downward from the peripheral portion of the upper wall surface, and a suction pipe provided on the upper wall surface of the unit housing; A classification net attached to the lower surface of the unit housing, a net packing that sandwiches the classification net from above and below, a net pressing flange that holds the net packing and the classification net in the unit housing, and the net pressing flange. In the filter unit including a flange bolt attached to the unit housing, a second pipe for supplying a cleaning liquid to the upper wall surface is provided.

  In the filter unit, the shape of the inner wall of the peripheral wall is a chevron whose uppermost part is equal to the hole diameter of the suction pipe from the lower surface portion of the filter housing to the suction pipe, and the outer wall surface of the peripheral wall is also a chevron. The upper wall surface has no shape.

  In the filter unit, an asymmetrical notch having the same shape is processed on the outer periphery of the classification network mounting surface of the unit housing and on a part of the outer periphery of the classification network.

  In the filter unit, a liquid guide is provided on the mesh holding flange.

  In a tank capable of holding a liquid in which particles are dispersed, a stock solution inlet, a bottom drain port of the tank, a drain pump connected to the drain port, and a liquid in which the particles are dispersed are again contained in the tank. A circulating liquid pipe to be returned to, a liquid amount sensor for detecting the amount of liquid in the tank, and an ultrasonic transducer outside the bottom of the tank as a classification tank, and a wet type using the filter unit in the classification tank Features a classification device.

  In the classification tank, as an alternative to the ultrasonic vibrator outside the tank bottom surface, the transmitting part of the ultrasonic vibrator different from the ultrasonic vibrator is directly installed in the liquid in the classification tank from the outside of the classification tank. It is characterized by entering.

  In the classification tank, without using the circulating liquid pipe and the drainage pump, a stirrer for stirring the liquid in the classification tank is provided, and the blade at the tip of the stirrer is directly charged into the liquid. It is characterized by that.

  The wet classifier is equipped with a pulsation generator for changing the pressure of the cleaning liquid.

  In the wet classifier, the pump or valve is equipped with a tube pump and a pinch valve that use a flexible tube.

According to the present invention, the following effects can be obtained.
In a wet classifier that uses a classification network with fine eyes, the cleaning liquid is allowed to flow into the filter unit and the classification network is backwashed to eliminate clogging. The system can be operated for a long time without the troublesome task of frequently stopping the operation of the device, removing the net, washing it, and restarting the operation. Can increase the operating rate of the equipment.
In addition, the effect of backwashing on the net surface is further increased by applying a change in pressure to the cleaning liquid for backwashing to remove clogging of the classification net, and it becomes possible to operate the apparatus for a longer time. The particles can be classified more efficiently, and the operating rate of the apparatus is increased.

  In addition, by forming the outer wall shape of the unit housing of the filter unit into a mountain shape, it is possible to prevent particles from precipitating and adhering to the outer wall of the unit housing, and all particles that should originally pass through the mesh of the classification network come into contact with the classification network. Opportunities increase and particles to pass through the net are efficiently guided out of the device.

  In addition, by making the inner wall shape of the unit housing into a mountain shape toward the suction pipe provided on the upper wall of the unit housing, the suction action from the suction pipe acts almost uniformly on the entire surface of the classification network, and particles that pass through the classification network The flow velocity of the liquid containing the liquid is almost uniform over the entire surface of the net, and it is possible to easily control the flow rate at which different particles pass through the net depending on the size, shape, specific gravity, etc. during suction, which is optimal for classification The conditions can be easily set, and the classification action by suction is uniform over the entire surface of the classification network, so that the network surface can be used efficiently.

  In addition, by providing a notch with the same shape on the outer circumference of the unit housing and the classification net, the unit housing can be confirmed without checking the difference in the size of the fine meshes on the front and back of the classification net that cannot be distinguished by visual inspection. The front and back of the net can be easily attached correctly.

  In addition, the liquid guide provided on the mesh holding flange to which the classification net is attached allows the particles in the liquid to be uniformly guided to the net surface in contact with the net surface in addition to the liquid flow in the classification tank. Opportunities increase and there is little residue in the tank of particles that should pass through the classification network.

  In addition, by using the pump and valve with a flexible tube for the liquid feeding part of the pump and valve used in this wet classifier and the opening and closing part of the liquid flow, the rotation of the pump and valve and the sliding part are in the liquid. Since the particles are not in direct contact with each other, there are no problems with pumps and valves due to wear and adhesion of the particles, and when handling different particles with the same classifier, it is easy to replace the tube itself. The cause of contamination can be removed at low cost.

FIG. 1 is a structural view of the pump circulation type classification tank of the present invention (elevated perspective view). FIG. 2 is a structural view (top view) of the pump circulation type classification tank of the present invention. FIG. 3 is a configuration diagram of a pump circulation type wet classifier showing an embodiment of the present invention. FIG. 4 is a sectional view of the filter unit of the present invention. 5 is a detailed view of part A in FIG. FIG. 6 is a cutaway structure diagram of the unit housing classification net mounting surface of the present invention. FIG. 7 is a diagram showing a classification net mounting flange according to the present invention. FIG. 8 is a cutaway view processed into the classification network of the present invention. FIG. 9 is a structural diagram of the ultrasonic wave oscillating unit submerged classification tank according to the present invention (perspective view) FIG. 10 is a structural diagram (top view) of the ultrasonic oscillating unit submerged classification tank of the present invention. FIG. 11 is a structural view (elevated perspective view) of the agitator circulation type classification tank of the present invention. FIG. 12 is a structural diagram (top view) of the agitator circulation type classification tank of the present invention. FIG. 13 is a configuration diagram of an agitator circulation type wet classifier showing an embodiment of the present invention.

  The form for implementing this invention is demonstrated based on FIGS.

  FIG. 1 shows a simplified elevational view of the classification tank 1 of the present invention in a perspective cross section. The classification tank is a classification tank outer box 1a and a classification tank inner box filled with a liquid in which particles are dispersed inside the outer tank. 1b, a liquid discharge port 1c provided in a part of the bottom of the inner box, a liquid discharge port 1d for discharging the liquid to the outside of the classification tank connected to the liquid discharge port, and a bottom outer side of the inner box One or more ultrasonic vibrators 1e for promoting dispersion of the attached particles, rubber legs 1f for stably placing the entire classification tank on the floor, and the entire upper surface opening of the classification tank, which are necessary for the apparatus Liquid through a classification tank lid 1 g for fixing various parts, piping, etc., a stock solution inlet 2 for introducing a mixture of particles and liquid into a classification tank inner box, and a circulation pump P2 (described in FIG. 3). Is connected to the circulating fluid pipe 3 for returning the fluid to the classification tank and the suction pump P1 (described in FIG. 3), and passes through the classification network in the liquid in which the particles are dispersed. A filter unit 4 for sucking particles to be collected, a cleaning liquid transport pipe 5 for supplying a cleaning liquid to the filter unit, a liquid amount sensor Ls for detecting a liquid amount in the classification tank, and the like. A liquid in which the particles are dispersed is indicated by 6.

  FIG. 2 is a diagram showing a schematic top view of FIG. 1 and shows an example of the arrangement of each component.

  FIG. 3 is an example showing an embodiment of the present invention, and shows a configuration of a pump circulation type wet classifier, which is configured from a classification tank 1 and a liquid outlet 1d of the classification tank (described in FIG. 1). A circulating pump P2 for returning the taken-out liquid to the classification tank again, a pump P3 for supplying the cleaning liquid to the filter unit 4 (described in FIG. 1), a pulsation generator Ps for changing the pressure of the cleaning liquid, Pump P1 for transferring the liquid containing the particles sucked through the filter unit to the outside of the apparatus, valves V1 to V5 for passing or closing each liquid, connecting pipes 14a to 14k connecting them, and suction liquid The container 11 is composed of a cleaning liquid container 12, a residual liquid container 13, and the like.

  In the classification operation of the wet classification apparatus, the liquid 6 containing particles in the classification tank 1 (described in FIG. 1) is filtered by the filter unit 4 by closing the valves V3 and V4 and opening the valve V2 and operating the pump P1. This is performed by being transferred to the suction liquid container 11 through a classification net 4d (described in FIGS. 4 and 5) attached to the container.

  Further, during the classifying operation, it is necessary to close the valve V3 in order to prevent the liquid from the clean liquid container 12 from being sucked into the filter unit by the suction pressure of P1, but the pump P3 is stopped while the pump P3 is stopped. If the device itself has a function of closing the liquid, V3 is unnecessary.

  The pulsation generator Ps is a mechanism that increases or decreases the amount of liquid flowing in a relatively short cycle, or the pump P3 is an electromagnetic pump, for example, and Ps is not required when the discharge pressure changes in a relatively short cycle. become.

When performing the back washing operation to the classification network with the cleaning liquid, the suction pump P1 is stopped, the valve V2 is closed, the valve V3 is opened, and the pump P3 and the pulsation generator Ps are operated, but the pump P1 is stopped. If P1 itself has a function of closing the liquid, V2 is unnecessary.
The classifying operation and the backwashing operation to the classifying network are appropriately performed alternately according to the state of the classification solution.

  When the operation is finished, the pump P1 is stopped, the valves V1, V2 and V3 are closed, the valves V4 and V5 are opened, the pumps P2 and P3 are operated, and the liquid in the classification tank 1 is stored in the residual liquid container. On the other hand, the cleaning liquid from the cleaning liquid container 12 is supplied into the classification tank via the circulating liquid pipe 3 and the piping system and the classification tank are cleaned.

FIG. 4 shows a schematic structure of a filter unit according to the present invention. The filter unit is provided with a suction pipe 4b and a cleaning liquid pipe 4c for enabling the backwashing of the classification network by the cleaning liquid at the uppermost end. A housing 4a, a classification mesh 4d (details are shown in FIG. 8) on the bottom of the unit housing, and a mesh packing 4e (details are shown in FIG. 5) for attaching the mesh to the main body without gaps above and below the classification mesh. And a ring-shaped mesh holding flange 4f having a liquid guide 4h (details are shown in FIG. 7) and a flange bolt 4g (details are shown in FIG. 5) for simultaneously attaching the classification mesh and the mesh packing to the unit housing. ing.
In addition, since the ceiling surface of the conventional unit housing is flat, there is a problem that particles in the liquid easily settle on the outer surface of the ceiling. However, the unit housing of the present invention has a mountain shape on the outer surface of the housing. Thus, the precipitation of particles on the outer surface of the housing is prevented.

  FIG. 5 is a detailed view of part A of the filter unit shown in FIG.

  FIG. 6 is a bottom view of the unit housing 4a of the present invention, in which an asymmetric cutout 4i is provided in a part of a ring-shaped plane, and a similar cutout (described in FIG. 8) previously provided in a classification net is provided in the unit. By matching the notch 4i of the housing, the front and back of the classification network can be correctly assembled to the unit housing.

  FIG. 7 is a side view and a bottom view showing a detailed example of mounting of the liquid guide 4h fixed to the lower side of the mesh holding flange 4f of the present invention. The liquid guide mainly flows the liquid from the direction indicated by the arrow. There is an effect of leading to the center portion of the flange, that is, the direction of the mesh surface of the classification net.

  FIG. 8 shows the shape of the classification net 4d of the present invention. A notch 4k having the same shape as the asymmetric notch 4i provided in the unit housing 4a is formed on a part of the outer periphery of the classification net, The front and back sides can be easily and correctly attached to the unit housing.

  FIG. 9 is a simplified perspective view of the elevation surface of the classification tank 7 of the present invention, and an ultrasonic transmitter Us that contributes to particle dispersion without being equipped with the ultrasonic transducer 1e described in FIG. Is placed in the liquid 6 in which the particles are directly dispersed through the classification tank lid 1g from above the classification tank, thereby selecting the ultrasonic vibrator Us type and the oscillation placed in the liquid. The degree of freedom of the position of the part increases.

  FIG. 10 is a diagram showing a schematic top view of the classification tank of FIG. 9 and shows an arrangement example of each component.

  FIG. 11 simply shows an elevation of the classification tank 8 of the present invention in a perspective cross section, and the circulation of the liquid in the classification tank is performed from, for example, an electric rotary stirrer Ag provided on the top and the outside of the classification tank. This is carried out by a stirring blade at the tip of a stirrer rotating shaft that is directly inserted into the liquid 6 through the lid 1g.

  FIG. 12 is a diagram showing a schematic top surface of the classification tank of FIG. 11 and shows an example of the arrangement of each component.

  FIG. 13 illustrates the basic configuration of the agitator circulation type wet classifier according to the present invention. The basic configuration shown in FIG. 3 is not equipped with a circulation pump P2 for circulating the liquid. Instead, a stirrer Ag (described in FIG. 11) is provided, and the configuration and piping of the apparatus are simplified and the operation is simplified as compared with FIG.

  In FIG. 11, the ultrasonic transducer 1e is installed on the bottom outer surface of the classification tank inner box 1b. However, as shown in FIG. As shown in the oscillating portion Sp of the ultrasonic transmitter Us, a method of directly applying ultrasonic waves into the liquid from the outside of the classification tank is also possible.

  By adding a backwashing mechanism to the filter unit to remove clogging of the installed classification screen, it is possible to perform efficient classification operation for a long time while minimizing clogging of the classification network. It can be widely applied to the classification use.

DESCRIPTION OF SYMBOLS 1 Pump circulation type classification tank 1a Classification tank outer box 1b Classification tank inner box 1c Liquid discharge port 1d Liquid extraction port 1e Ultrasonic vibrator 1f Rubber leg 1g Classification tank lid 2 Stock solution input port 3 Circulating fluid pipe 4 Filter unit 4a Unit housing 4b Suction pipe 4c Clean liquid pipe 4d Classifying net 4e Net packing 4f Net holding flange 4g Flange bolt 4h Liquid guide 4i Unit housing notch 4j Range of classification net 4k Classifying net notch 5 Clean liquid transfer pipe 6 Liquid containing particles 7 Ultrasonic Oscillator Liquid Placement Classifier 8 Stirrer Circulation Type Classification Tank 11 Aspirate Liquid Container 12 Cleaner Liquid Container 13 Residual Liquid Container 14a Connection Pipe 14b Connection Pipe 14c Connection Pipe 14d Connection Pipe 14e Connection Pipe 14f Connection Pipe 14g Connection Pipe 14h Connection pipe 14i Connection pipe 14j Connection pipe 14k Connection pipe 50 Flow of liquid Be)
P1 Suction pump P2 Circulation pump P3 Clean liquid pump V1 Circulation valve V2 Suction valve V3 Clean liquid valve V4 Wash valve V5 Waste liquid valve Ag Stirrer Ls Liquid quantity sensor Ps Pulsation generator Us Ultrasonic transmitter Sp Ultrasonic oscillator

Claims (9)

  A unit housing comprising an upper wall surface defining a space for sucking liquid; a peripheral wall extending downward from the peripheral edge of the upper wall surface; a suction pipe provided on the upper wall surface of the unit housing; and a lower surface of the unit housing A classification net attached to the opening; a net packing that sandwiches the classification net from above and below; a net holding flange that holds the net packing and the classification net in the unit housing; and the net holding flange that is attached to the unit housing. A filter unit comprising a flange bolt, wherein the second pipe for supplying a cleaning liquid to the upper wall surface is provided.   2. The filter unit according to claim 1, wherein the shape of the inner wall of the peripheral wall is a mountain shape whose uppermost portion is equal to the hole diameter of the suction tube from the lower surface of the filter housing toward the suction tube, and the outer wall surface of the peripheral wall. The filter unit is also formed in a shape having no upper wall as a result.   3. The filter unit according to claim 1, wherein an asymmetrical notch is processed in the same shape on an outer periphery of the classification network mounting surface of the unit housing and a part of the outer periphery of the classification network. .   The filter unit according to any one of claims 1 to 3, wherein a liquid guide is provided on the mesh holding flange.   In a tank capable of holding a liquid in which particles are dispersed, a stock solution inlet, a bottom drain port of the tank, a drain pump connected to the drain port, and a liquid in which the particles are dispersed are again contained in the tank. A circulating tank that returns to the tank, a liquid sensor that detects the amount of liquid in the tank, and an ultrasonic transducer outside the bottom of the tank is used as a classification tank, and the classification tank includes A wet classifier using any one of the filter units.   In the classification tank according to claim 5, as an alternative to the ultrasonic vibrator outside the tank bottom surface, an ultrasonic vibrator different from the ultrasonic vibrator is inserted into the liquid in the classification tank from the outside of the classification tank. A wet classifier that directly inserts the transmission part.   The classification tank according to claim 5 or 6, wherein the circulating liquid pipe and the drainage pump are not used, a stirrer for stirring the liquid in the classification tank is provided, and the blade at the tip of the stirrer is directly connected A wet classifier which is charged into the liquid.   8. The wet classifier according to claim 5, further comprising a pulsation generator that applies a pressure change to the cleaning liquid. 9. The wet classifier according to claim 5, further comprising a tube pump and a pinch valve that use a flexible tube as a pump or a valve.

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