JPH0446801Y2 - - Google Patents

Description

[Detailed description of the invention] [Object of the invention] Industrial application field The present invention relates to a filter medium for removing suspended matter from a liquid containing a small amount of suspended matter.

BACKGROUND ART In order to efficiently filter a liquid containing a small amount of suspended matter to obtain a large amount of clear filtrate, it is common to use a tightly woven fabric or the like as a filter medium. In such cases, the amount of filter cake generated is small compared to the amount of filtrate, so in order to increase the capacity of the filter, a relatively small volume filter can with a large area of filter cloth folded is required. Various folding configurations have been proposed.

Generally, when filtering a suspension, hydraulic pressure is applied to the primary side, so the filter medium is compressed toward the secondary side. Therefore, the filter medium is usually supported from the secondary side by a mesh or a perforated plate, but when a folded filter cloth as mentioned above is used as the filter medium, it may be supported by a woven net or the like. A filter medium is provided in contact with both sides of a support body that allows liquid to flow in the lateral direction, and even if the filter medium is compressed, the pressure is balanced through the support body, and the flow path for the filtrate is also secured. It is also used.

Recently, there has been a strong demand for filters that have a larger filtration capacity per volume, are smaller, and are easier to maintain. On the other hand, sheet-like unit filter media having through-holes in the center are piled up, and each unit filter media is connected to the adjacent unit filter media on one side at its periphery, and the adjacent unit filter media on the other side is connected to its through-holes. Using filter media that are joined at the edges and assembled as one, suspension is supplied from the outside in parallel to each unit filter media surface, and the filtrate that has passed through each unit filter media collects in the center and passes through the through holes. There are filters that are configured to flow through and out. Then, a method was devised in which the assembly type filter media in this filter is constructed of filter cloths, and a net is interposed between the filter cloths to increase the number of unit filter media. However, such prefabricated filter media are troublesome to assemble, and when attempting to make them into a continuous piece by sewing them together to make them easier to handle, it becomes difficult to incorporate a mesh between each unit of filter media. There was also a limit to the increase in filtration capacity.

Problems to be Solved Under the above-mentioned circumstances, the present invention provides a bellows-type filter medium that can further increase the filtration capacity per volume of the filter and is formed in a continuous and integral manner and is extremely easy to handle. The purpose is to provide the following.

[Structure of the idea]

Means for Solving the Problems In order to achieve the above objectives, the present invention has the following features:
A plurality of sheet-like unit filter cloths having a through hole in the center are stacked, and each unit filter cloth is connected to the adjacent unit filter cloth on one side at its periphery, and the adjacent unit filter cloth on the other side is connected to its perforated edge. A spacer made of a mesh having a mesh size within the range of 1 to 10 mm is interposed between the inner surfaces of adjacent unit filter cloths, and the adjacent unit filter cloths are connected to each other. A bellows-type filter medium is constructed by removably inserting an annular spacer having incisions between the outer surfaces of the filter cloth, which is made of a mesh having an opening size in the range of 1 to 10 mm.

The bellows type filter medium of the present invention will be explained with reference to the drawings.

FIG. 1 is a perspective view of an example of the bellows-type filter medium of the present invention with a portion cut away, and FIG. 2 is a partial sectional view thereof. In the figure, 1 is a sheet-like unit filter cloth, with a through hole 2 in the center.
For example, it is formed into a circular annular shape. A large number of these unit filter cloths 1 are stacked one on top of the other, and the periphery of the uppermost filter cloth 1a and the periphery of the second filter cloth 1b are joined by sewing or welding. The through-hole edge of the third filter cloth 1b and the through-hole edge of the third filter cloth 1c are connected in the same manner as described above, and are successively connected in the same manner to form a continuous and integral bellows type filter medium.

There is a mesh opening of 1 between the filter cloth 1a and the filter cloth 1b.
A mesh body 3 having a diameter of 1 to 10 mm is formed, for example, into a disk shape and is interposed as a spacer, and the same mesh size as described above is 1 to 10 mm between the filter cloth 1b and the filter cloth 1c. A mesh body 4 within a range of 10 mm is formed, for example, in an annular shape and is interposed as a spacer. Here, as shown in FIG. 3, the mesh body 4 is formed, for example, in an annular shape, with at least one cutout 4b extending from a through hole 4a in the center to the outer peripheral edge. When there are two or more cutout portions 4b, at least one of the cutout portions 4b may be left open and connected so as to be rotatable or foldable. The mesh body 4 formed in this manner can be inserted between each unit filter cloth, for example, between the filter cloth 1b and the filter cloth 1c, after forming the bellows type filter medium, or vice versa. Can be removed.

On the other hand, the mesh body 3 may be formed into a simple corner or disk shape to match the shape of the unit filter cloth 1;
It may be formed into an annular shape with a through hole provided in the center. Furthermore, it may be of the same shape as the net body 4. When the mesh body 3 with through holes is used, the bellows-type filter medium has a through hole in the center, and the length of the filter medium can be compressed and fixed using a fixing rod inserted through the hole, for example. It becomes possible to do so. When the mesh body 3 is flat or annular, when the unit filter cloths 1 are successively joined to form a bellows-type filter medium, the joining may be performed with the mesh body 3 interposed. In that case, for example, the filter cloth 1
a, the mesh body 3, and the filter cloth 1b, and filter cloth 1a
The peripheral edge of the filter cloth 1b may be joined to the peripheral edge of the filter cloth 1b by sewing or welding, and a bellows-type filter medium can be formed by sequentially performing such steps. Note that if the mesh body 3 is annular with incisions and can be reduced by bending or folding to a size that allows it to pass through the through holes 2, each unit is It can be inserted between filter cloths, for example between filter cloth 1a and filter cloth 1b, and vice versa.

In this way, the nets 3 and 4 constituting the spacer interposed between the surfaces of adjacent unit filter cloths 1 are
Those obtained by weaving or knitting or cross-welding corrosion-resistant linear bodies are used, and may be, for example, plain-woven nets made of stainless steel wire or welded nets made of nylon or polypropylene. Further, the mesh opening of such a net is preferably 1 to 10 mm. When it is smaller than 1 mm, the linear bodies that make up the net are thin and the intervals between the unit filter cloths become narrow, which tends to cause uneven liquid flow.When it is larger than 10 mm, the linear bodies that make up the net are thin. If it is not thick, the spacing between the unit filter cloths cannot be maintained, so the linear body must be thick, and therefore the spacing between the unit filter cloths becomes wide, increasing the volume of the filter medium, both of which are undesirable. Note that the net body 3 and the net body 4 may be formed using nets of different materials or shapes.

Function As explained above, the bellows-type filter medium of the present invention in which a spacer made of a net is interposed between the surfaces of unit filter cloths does not allow suspension or filtrate to remain between the surfaces of the filter cloths even when compressed. A gap is maintained that allows free flow, allowing 100% effective use of the filtration area.

[Effect of idea]

The bellows-type filter medium of the present invention has spacers made of mesh having the above-mentioned specific structure inserted in a specific manner, so that it has a very large filtering area despite its small size, and can perform not only efficient filtering but also extremely efficient backwashing. It is easy to assemble and disassemble the filter medium, and is easy to handle. Even if the filter medium becomes unrecyclable due to clogging or the like, the spacers can be removed and recovered for reuse.
This has the advantage that it is possible to configure a filter that is small, has a large filtering capacity, is easy to maintain, and is economical.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway perspective view showing the structure of an example of a bellows-type filter medium of the present invention, FIG. 2 is a partial longitudinal sectional view thereof, and FIG. 3 is a plan view of an example of a spacer. 1...Unit filter cloth, 2...Through holes, 3, 4...Network.

Claims (1)

[Scope of utility model registration request] A plurality of sheet-like unit filter cloths having a through hole in the center are stacked, and each unit filter cloth is connected to the adjacent unit filter cloth on one side at its periphery, and the adjacent unit filter cloth on the other side is connected to its perforated edge. A spacer made of a mesh having a mesh size within the range of 1 to 10 mm is interposed between the inner surfaces of adjacent unit filter cloths, and the adjacent unit filter cloths are connected to each other. A bellows-type filter medium, characterized in that an annular spacer made of a mesh having an opening of 1 to 10 mm and having an incision is removably inserted between the outer surfaces of a filter cloth from the outside.