JP2019098315A - Filtration device - Google Patents

Abstract

To provide a filtration device which is used for pond cleaning and cleaning of circulation water, does not require great quantity of labor for installation and maintenance and does not require a large quantity of back washing water upon back washing.SOLUTION: In a filtration device, even when floating substance amount caught by cloth surface increases and occlusion proceeds, resin cylinder hollow molded article charged between an inner pipe and an outer pipe is revolved in the pipe while being brought into contact with cloth, thereupon, adhesive matter deposited on the surface of the cloth is successively removed and, thereby, occlusion is suppressed. Further, in the filtration device, upper part one ends of double cylindrical pipes vertically arranged are fixed to the same top plate 20, another ends of the inner pipe is closed with a bottom plate 17, the inner pipe 14 is covered with the cloth 15 sewn to the cylinder perforated with a number of holes, upper and lower both sides are fixed with a band 16, the outer pipe has an inflow port 11 connected such that a revolving flow is generated, a lower part has a hopper structure 19, a valve which is automatically opened and closed is attached to the lowermost part, and foamed resin molded article 23 is charged to a gap between the inner pipe and the outer pipe.SELECTED DRAWING: Figure 2

Description

  The present invention relates to so-called filtration devices.

  Conventionally, various filtration devices, such as a pressure type, a gravity type, a centrifugal type, and a vacuum type, are used for pond purification and purification of circulating water. Among them, there is a sand filtration apparatus generally adopted, but since this uses a large amount of sand for filtration, the weight of the apparatus increases, and much labor is required for installation and maintenance. In addition, there is a problem that a large amount of backwash water is required when backwashing when the blockage progresses.

JP, 2016-68042

  That is, in the conventional filter, since filtration is performed using a large amount of sand, there is a problem that the weight of the device is increased, and a large amount of labor is required for installation and maintenance. In addition, a large amount of backwash water was required when backwashing when the blockage progressed.

  The present invention, as a means for solving this conventional problem, fixes the upper end of the vertically arranged double cylindrical tubes to the same top plate, and the center portion of the top plate has a connection port to the outside, The other end of the cylinder is sealed with a plate, and the inner cylinder surface is sealed with a cloth sewn on a cylinder, fixed at the top and bottom with a band, and the outer cylinder swirls the fluid pumped by the pump. The lower part has a connection to the outside, and the space between the inner cylinder and the outer cylinder is filled with a resin molded product, It is a filtering device characterized in that it is possible to control the flow of liquid in a cylinder by combining three valves which are automatically opened and closed to the outside.

  The filter of the present invention performs filtration by passing raw water through cloth and capturing suspended matter larger than cloth. As the filtration proceeds, the amount of suspended matter trapped on the cloth surface increases and the blockage progresses, but the resin cylinder hollow molded product filled between the inner cylinder and the outer cylinder swirls while contacting the cloth in the cylinder with the cloth At that time, the clogging is suppressed by sequentially removing the deposit deposited on the surface of the cloth. The removed deposits gradually descend and finally accumulate in the hopper portion at the bottom of the sleeve.

It is a flowchart of the filter of this invention. It is a cross-sectional detail of the filter main body of this invention. It is AA sectional drawing in FIG.

  Next, an embodiment of the present invention will be described with reference to FIGS. 1 to 3.

  In FIG. 1, 1 plays a central role of processing in the filter body of the present invention. The flow of water inside the filter body can be changed by controlling two to three automatic switching valves. 6 measures the fluid pressure during circulation operation. 7 is the undiluted solution to be purified, which is the water of lakes and ponds. The pump 8 is used to feed raw water to the filter and to control the automatic switching valve to feed backwash water during backwashing. The drainage pit 9 is a pit for discharging the drained water in which solids are concentrated at the time of backwashing.

FIG. 2 is a cross-sectional detail view of the filter main body 1, and has a circulating water outlet / backwashing water inlet 10, and a circulating water inlet 11 and a connection port to the outside of the backwashing water outlet 12. The outer cylinder 13 is joined at its upper part to the flange 21 and at its lower part to the hopper 19 and connected to the backwash water outlet 12. A wire mesh 18 is fixed to the hopper 19. The inner cylinder 14 has a structure with a large number of holes, the upper part is joined to the top plate 20 and the lower part is closed by the bottom plate 17. A cloth 15 sewn into a cylinder is placed on the side surface of the inner cylinder, and the upper and lower sides are fastened with a fixing band 16. A resin molded product 23 is filled in the space between the outer cylinder and the inner cylinder.
The flange 21 and the top plate 20 sandwich the packing 22 between them and are fixed by bolts and nuts 5.

  3 is a cross-sectional view taken along the line A-A in FIG. 2, and the circulating water inlet 11 is attached at a location eccentric from the center so that the swirling flow is easily generated in the space between the outer cylinder and the inner cylinder It is shown that.

  Next, the actual movement will be described. At the time of normal filtration operation, the filtered water switching valve 2 is open and the discharged water switching valve 4 is closed. The raw water pumped by the pump 8 passes through the filtration / backwashing switching valve 3, but the water passage to the circulating water inlet 11 on the side of the filter body 1 is opened, and the water passage to the circulating water outlet / backwashing water inlet is It is closed. Raw water pumped from the pump 8 passes through the circulating water inlet 11 on the side surface of the outer cylinder, is fed into the cylinder, flows along the gap between the outer cylinder and the inner cylinder, and generates a swirling flow. By the swirling flow, the resin molded product filled between the outer cylinder and the inner cylinder swirls together in the cylinder. Raw water that has flowed in passes through the cloth 15 and is fed to the inside of the inner cylinder. At this time, minute suspended solids are captured, and only clear water is contained in the cylinder, which is discharged from the circulating water outlet at the top and returned to the lake and pond 7.

  If filtration is continued through the cloth, blockage usually proceeds immediately due to the deposition of suspended solids, and the filtration pressure increases and the amount of filtered water decreases. However, in the filtration device of the present invention, the resin molded product swirls on the surface of the cloth to constantly peel off the trapping matter deposited on the surface. Some of the exfoliated substances are trapped again on the cloth, but when the substance is pressed against the cloth by filtration pressure, the suspended substances combine with each other and the particles become large. As a result, when exfoliated, since it has the characteristic of being easier to settle than the original minute suspended matter, it gradually descends while repeating exfoliation and capture. Finally, the material that has escaped from the swirling flow reaches the lower hopper 19, passes through the wire mesh, and accumulates as it is. Therefore, it is possible to continue filtration for a relatively long time without causing an increase in filtration pressure or a decrease in the amount of filtered water.

  When filtration is continued, the time may vary depending on the concentration of suspended solids in the raw water and the initial particle size, but it may be extended to places where particles that are gradually captured remain on the surface of the cloth without peeling, By the increase of the intruding particles, the filtration pressure is gradually increased and the amount of filtered water is gradually decreased. In that case, the process proceeds to the backwashing process, but if the pressure rises to the set pressure of the pressure gauge 6 or if the property of the raw water is constant and the rising speed of the filtration pressure can be grasped, the timer to the backwashing process It is possible to automatically perform the migration of

  The backwashing process is performed by switching various switching valves. When moving to the backwashing process, the filtered water switching valve 2 is closed, and the discharged water switching valve 4 is opened. The raw water pumped by the pump 8 passes through the filtration / backwashing switching valve 3, but the water passage to the circulating water inlet 11 on the side of the filter body 1 is closed, and the water passage to the circulating water outlet / backwashing water inlet is It will open. By switching the valve, the flow direction is changed, and the raw water sent from the pump flows from the backwash water inlet 10 into the inside of the inner cylinder and flows out to the outside of the inner cylinder through the cloth. It is discharged to the drainage pit 9 together with the sediment accumulated in the hopper during the filtration process from the backwash water outlet provided at the lower part as it is. The surface supplements of the cloth 15 peel off with the flow of water from the inside of the backwash water. In addition, since the cloth 15 has elasticity, it can be spread by the pressure from the inside by the flow of backwashing water, and by opening the cloth, it is possible to peel off the substance captured to the back of the cloth as well. It has become. Although a part of the resin molded product tries to flow out along the flow of the backwash water, since the hole opened in the wire mesh 18 is smaller than the resin molded product, it does not flow out.

  The backwashing time can be completed in about 20 seconds because only the material trapped in the cloth is exfoliated, and a long time backwashing like a sand filter that sterically captures the material is not necessary. Therefore, it is possible to operate with a small amount of drainage.

  Since the flange and the top plate are fixed by the bolt and nut 5, it is possible to remove the inner cylinder from the outer cylinder, so it is possible to replace the molded product made of cloth or resin due to aging.

  The present invention is a filtration device for the purpose of purifying lakes and ponds, but it is possible to carry out filtration for various liquids by changing the specifications of the cloth.

1 Filter body 2 Filtered water switching valve 3 Filtered and backwashed water switching valve 4 Drained water switching valve 5 Bolt, nut 6 Pressure gauge 7 Purification target of lakes and ponds 8 Pump 9 Drain pit 10 Circulating water outlet, Backwashed Water inlet 11 Circulating water inlet 12 Backwashed water outlet 13 Outer cylinder 14 Inner cylinder 15 Stretchable cloth 16 Fixing band 17 Bottom plate 18 Wire mesh 19 Hopper 20 Top plate 21 Flange 22 Packing 23 Resin molded article

Claims (1)

The outer cylinder of the double-cylindrical tubes arranged vertically is an inlet provided to generate a swirling flow of the liquid pumped by the pump, a flange at the upper part, a hopper structure at the lower part, and an outer part at the lowermost part The inner cylinder is closely fixed to a top plate with the upper part processed to the same diameter as the flange diameter, the central part of the top plate has an external connection port, and the inner cylinder has a large number of holes. The other end of the inner cylinder is sealed with a bottom plate, and an elastic cloth sewn in a cylinder is covered on the inner cylinder surface, and upper and lower are fixed with a band, and resin is made in the gap between the inner cylinder and the outer cylinder. A filtration device characterized in that it is filled with the molded product of (4), and can control the flow of liquid in a cylinder by combining three valves which are automatically opened and closed to the outside.

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