JP2005103488A - Liquid filter and filter medium - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a liquid filter which can carry out efficient cleaning of a filter medium. <P>SOLUTION: The liquid filter is provided with a sealed-state vessel 11 which has a lateral cylindrical body wall 21, and has a liquid supply mouth 31 at the bottom and a liquid discharge mouth 35 at the top portion respectively, the filter medium 12 contained in the vessel 11, and a rotating flow means which generates a vertical rotating flow along an internal surface of the body wall 21 in the vessel 11. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a liquid filtration device and a filter medium used for filtering liquids such as grinding / cutting fluid, papermaking wastewater, civil engineering wastewater, dyeing factory wastewater, and food factory wastewater.

  As this type of liquid filtration device, there are a sealed container having a vertical cylindrical body wall, a bottom wall and a top wall, a liquid supply port provided on the bottom wall, and a liquid discharge port provided on the top wall, and a container What is provided with the upper floor and lower floor provided so that the inside may be divided into three spaces, and the filter medium with which it filled between the upper floor and the lower floor is known (for example, refer patent document 1). ).

In this type of apparatus, the biggest challenge is how to efficiently clean contaminated filter media. In the above apparatus, the filtration medium is washed by a so-called back washing method in which the washing medium is supplied by supplying washing water from the drainage port, contrary to the time of filtration. It was not right.
Japanese Patent Application Laid-Open No. 8-299713

  An object of the present invention is to provide a liquid filtration device capable of efficiently cleaning a filter medium.

  The liquid filtration device according to the present invention includes a sealed container having a horizontal cylindrical body wall, a liquid supply port at the bottom, and a liquid discharge port at the top, and a filter medium filled in the container. And a swirling flow means for generating a vertical swirling flow in the container on the inner surface of the body wall.

  According to the present invention, the filter medium and the contaminants attached thereto are separated by generating a swirling flow in the container. Therefore, compared with the case where the flow of one direction at the time of backwashing is utilized, a filter medium can be washed efficiently.

  Furthermore, when a sewage discharge port is provided at the bottom of the container together with a liquid supply port, the sewage containing the separated contaminants can be efficiently discharged from the container.

  In addition, when the swirling means has at least one washing water nozzle with the jet port directed in the circumferential direction of the inner surface of the body wall, a swirling flow can be generated with a simple structure.

  In addition, when a drain pipe is connected to the drain port and the inner end of the drain pipe protrudes inward from the inner surface of the barrel wall, the processing liquid flows along the inner surface of the barrel wall and is filtered. It is possible to prevent the material from passing through.

  In addition, when the filter medium is made of a sponge having a specific gravity of less than 1 and having an open cell structure, during filtration, the filter medium is lifted by its buoyancy and contracted and compressed, so that the filtration accuracy becomes more precise. At the time of washing, since the compressed filter medium is deformed to return to its original state, the separating action of the filter medium and the contaminants is further promoted.

  Further, instead of the filter medium, a filter medium made of a sponge body having an open cell structure and a sponge body having an independent cell structure may be employed. If the filter medium is composed only of a sponge having an open cell structure, when the filter medium is immersed in the treatment liquid for a long period of time, the treatment liquid may be filled in the cell and the filter medium may sink. In that respect, if a part of the filter medium is composed of a sponge body having an independent cell structure, this serves as a floating bag, and the filter medium can continue to float for a long time.

  The filter medium according to the present invention comprises a sponge body having an open cell structure and a sponge body having an independent cell structure.

  According to the filter medium of the present invention, as described above, a filter agent having both filter performance and buoyancy is provided.

  Embodiments of the present invention will be described below with reference to the drawings.

  Referring to FIGS. 1 and 2, the liquid filtration apparatus includes a container 11 and a number of granular filter media 12 filled therein.

  The container 11 is composed of a horizontal cylindrical body wall 21 and left and right side walls 22 and 23 that close both ends of the body wall 21, respectively.

  A liquid supply port 31 is provided at the bottom of the trunk wall 21. An outlet end of a liquid supply pipe 32 is connected to the liquid supply port 31. The outlet end opening is covered with a liquid supply wire mesh 33. A liquid supply valve 34 is provided in the liquid supply pipe 32. A drainage port 35 is provided at the top of the trunk wall 21. The drain end 35 is connected to the inlet end of the drain pipe 36. The inlet end protrudes inward from the inner surface of the trunk wall 21. The inlet end opening is covered with a drainage wire mesh 37. The drainage pipe 36 is provided with a drainage valve 38. A dirty liquid discharge port 41 is provided at the lower end of the right side wall 23. An inlet end of a sewage discharge pipe 42 is connected to the sewage discharge port 41. The entrance end opening is covered with a filth wire mesh 43. The dirty liquid discharge pipe 42 is provided with a dirty liquid discharge valve 44.

  Washing water nozzles 51 are attached so as to penetrate the body wall 21 at two positions facing each other across the center of the body wall 21. The washing water nozzle 51 has a jet port 52 directed in the circumferential direction of the inner surface of the trunk wall 21.

  Each filter medium 12 is made of a foamed rubber (resin sponge) spherical sponge body having a size of about 5 to 10 mm, has a shrinkable deformability, and has a buoyancy that floats in water that is less than 1. . The sponge is preferably an open cell structure suitable for a filter.

  As shown in FIG. 1, the filter medium 12 is preferably filled so that a space is formed above the filled filter medium 12 instead of filling the container 11.

  At the time of filtration, the liquid supply valve 34 and the drainage valve 38 are both opened, and the dirty liquid discharge valve 44 is closed. When the processing liquid is sent into the container 11 through the liquid supply pipe 32 by a pump (not shown), the filter medium 12 rises as shown in FIG. 3 and is pressed to the upper part of the container 11 by the buoyancy. As a result, the filter medium 12 is contracted and compressed. Thereby, the eyes of the filter medium 12 become finer and the filtration accuracy becomes precise. The treatment liquid is allowed to pass through the filter medium 12, whereby the contaminants contained in the process liquid are adsorbed and removed by the filter medium 12. The treated processing liquid is discharged from the container 11 through the drain pipe 36.

  When performing the treatment, a part of the treatment liquid flows along the inner surface of the container 11 toward the liquid discharge port 35, but there is little chance of contact with the filter medium 12 during the process, which may result in poor filtration. . If the inlet end of the drainage pipe 36 is not protruded inward from the inner surface of the barrel wall 21, the processing liquid reaching the drainage port 35 is discharged from the container 11 with poor filtration. . However, since there is an inwardly protruding inlet end of the drainage pipe 36, this is prevented. That is, in order for the processing liquid that has reached the vicinity of the drainage port 35 to be discharged from the container 11, it is necessary to get over the inwardly projecting inlet end, and in this case, it will come into contact with the filter medium 12. It is.

  When contaminants adhere to the filter medium 12 and become clogged, and it becomes necessary to clean the filter medium 12, this time, both the liquid supply valve 34 and the drain valve 38 are closed, and the dirty liquid discharge valve is closed. 44 is open. As shown in FIG. 4, the cleaning water is supplied to the cleaning water nozzle 51, and the cleaning water is ejected from the ejection port 52. Then, a swirl flow that flows along the inner surface of the container body wall 21 is generated in the container 11 as indicated by an arrow. The filter medium 12 is stirred by the swirling flow, and the contaminants are separated and removed from the filter medium 12. At this time, the filter medium 12 compressed (contracted) is released from the influence of buoyancy and returns to its original shape. This promotes the separation action of the filter medium 12 and the contaminants.

  If the filter medium 12 is regenerated by the above procedure, the filtering operation can be resumed. Continuous operation is possible by automatically programming the opening and closing of the valve.

  FIG. 5 shows a modification of the filter medium 12. The filter medium 12 according to this modification has a rectangular parallelepiped block shape, and includes a sponge body 61 having an open cell structure and a sponge body 62 having an independent cell structure. Both the spongy bodies 61 and 62 are integrated with each other by bonding.

  FIG. 6 shows a further modification of the filter medium 12. In this modification, a sandwich structure in which two sponge bodies 71 having an open cell structure sandwich a sponge body 72 having an independent cell structure from both sides is employed.

  When many open-cell sponge bodies are immersed in water (oil, other liquids) for a long time, the cells may be filled with water and lose buoyancy and sink. The sponge body with an independent cell structure can be kept floating for a long time because it has a structure like a lump of floating bags in which water does not enter the cell. Filter material that does not lose buoyancy for a long period of time by making the action of the filter into an open cell sponge body, allowing the sponge body of the independent cell structure to function as a floating bag, pasting both sponge bodies together, and integrating them Become.

  In the above, the trunk wall 21 of the container 11 is shown as being horizontal, but it is not necessarily horizontal and may be inclined. In short, it is sufficient that a swirl flow passing through the high place and the low place is generated in the container 11.

  The number of washing water nozzles 51 is not limited to two, and may be one or three or more.

  The filter medium 12 having a buoyancy of 1 or more can be used. Further, the sponge body is not limited to an open cell structure, and may be a single cell having an independent cell structure.

  The dirty liquid discharge port 41 is not always necessary. In that case, the liquid supply port 31 may be used also as the sewage discharge port 41. Moreover, the cleaning liquid supplied to the nozzle may be able to use the treatment liquid.

1 is a vertical cross-sectional view of a liquid filtration device according to the present invention. It is the same vertical longitudinal cross-sectional view. It is a vertical cross-sectional view of the liquid filtration device during filtration. It is a vertical cross-sectional view of the liquid filtration device at the time of cleaning. It is a perspective view which shows the modification of a filter medium. It is a perspective view which shows the further modification of a filter medium.

Explanation of symbols

11 containers
12 Filter media
21 trunk wall
31 Supply port
35 Drain outlet

Claims (7)

A sealed container 11 having a horizontal cylindrical body wall 21 and provided with a liquid supply port 31 at the bottom and a liquid discharge port 35 at the top, and a filter medium 12 filled in the container 11, A liquid filtration device comprising a swirling flow means for generating a vertical swirling flow in the container 11 on the inner surface of the body wall 21. The liquid filtration device according to claim 1, wherein a sewage discharge port is provided along with a liquid supply port at the bottom of the container. The liquid filtration device according to claim 1 or 2, wherein the swirling flow means has at least one washing water nozzle 51 in which the jet port 52 is directed in the circumferential direction of the inner surface of the body wall 21. The drainage pipe 36 is connected to the drainage port 35, The inner end part of the drainage pipe 36 is made to protrude inward rather than the inner surface of the trunk | drum wall 21. Liquid filtration equipment. The liquid filtration device according to any one of claims 1 to 4, wherein the filter medium 12 is formed of a sponge having a specific gravity of less than 1 and an open cell structure. The liquid filtration apparatus according to any one of claims 1 to 4, wherein the filter medium 12 includes sponge bodies 61 and 71 having an open cell structure and sponge bodies 62 and 72 having an independent cell structure. A filter medium comprising sponge bodies 61 and 71 having an open cell structure and sponge bodies 62 and 72 having an independent cell structure.

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