JPS646887Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) This invention relates to leaf filters, and in particular to improvements in filter bodies that prevent the accumulation of solid particles that leak into the inside of the filter leaves. .

(Prior Art) A leaf filter, which is a type of horizontal pressure filter, has been put into practical use.

FIG. 1 is a block diagram of this type of leaf filter, and FIG. 2 is a sectional view of a conventional filter leaf used in this leaf filter.

In the figure, 1 is a filter main body, and 2 is a filter body rotatably mounted within this main body.

The filter body 2 has a plurality of horizontal filter leaves 4 attached to the hollow central shaft 3, and the filter leaves 4 are attached to the hollow central shaft 3.
It was communicated with.

In the conventional filter leaf 4, as shown in FIG. 2, a coarse support net 6 for maintaining gaps is interposed on a support plate 5, and a fine filtration upper net 7 is placed on top of the support net 6. , are integrally fixed at the peripheral edge of the support plate 5 with a tightening ring 8.

Filtration in the filter having the above configuration is performed by supplying the liquid to be filtered under pressure, and the filtrate exits from each filter leaf 4 through the hollow part of the hollow central shaft 3. A feature of this filter is that the filter dregs adhering to the filter leaves 4 can be peeled off. That is, after filtration, the undiluted solution is extracted from the main body, and the hollow center shaft 3 to which each filter leaf 4 is attached is rotated by the motor 9, and the centrifugal force is used to shake it out to the outer periphery of the filter leaf, thereby scraping the filter slag that collects at the bottom of the main body. It is scraped out with a plate 16 and discharged. However, in conventional filters, solid particles pass through the upper net 7 during pre-coating to form a pre-coat layer on the filter leaves prior to filtration, and during removal of filter slag after filtration, resulting in solid particles forming around the support net. The solid particles are moved toward the outer periphery of the filter leaf and deposited in the gap between the coarse support net 6 and the support plate 5 due to the centrifugal force caused by the rotation of the filter during filter slag removal.

The outer periphery of the filter leaf is where the flow rate of liquid is usually the slowest during filtration and when cleaning the filter leaf, and the solid particles that accumulate on the inner and outer periphery of the filter leaf continue to accumulate without flowing, and the filtration cycle As the process is repeated, the amount of deposit increases.

The solid particles accumulated in this way are further pressed by the centrifugal force caused by the rotation of the filter body, solidify and prevent the liquid from passing through, reducing the effective filtration area of the filter leaves and causing a decline in filtration performance. Instead, this begins to push up the upper net 7, and the upper net 7 eventually becomes damaged.

This phenomenon is especially noticeable when filtering highly viscous substances or liquids containing sticky solid particles, and although measures are needed to prevent it, there have been no appropriate preventive measures in the past. Currently, the filter leaves are disassembled at appropriate times and solid particles are manually removed.

(Purpose of the invention) This invention is designed to eliminate solids that have passed through the upper net and leaked into the inside of the filter leaf when the filter slag adhering to the filter leaf is removed by the centrifugal force generated by the rotation of the filter body. The object is to provide a leaf filter that limits the movement of particles, eliminates concentrated accumulation on the outer periphery of the filter leaf, allows natural outflow, maintains filtration performance over a long period of time, and prevents damage to the upper net. .

(Structure of the invention) Hereinafter, embodiments of this invention will be described with reference to the drawings.

Figure 3 shows a partially cutaway plan view of the filter leaf of this invention, and Figure 4 shows a longitudinal sectional view of the same.The basic configuration of the filter body and filter body is the same as the conventional one described above, so we will explain it. omitted.

Therefore, in FIGS. 3 and 4, the filter leaf 10 of this invention has between the upper net 7 and the support plate 5,
A perforated plate 11 supporting the upper net 7 and a large number of support wires 13 are disposed in a scattered manner close to each other to form a gap 12 between the perforated plate 11 and the support plate.

This support wire 13 has a main part 13a extending in the radial direction, and a bent part 1 continuous to the main part 13a.
3b, and the bent portions 13b of adjacent support wires shifted in the radial direction partially overlap when viewed in the radial direction.

Further, the number of support wires 13 is set to such an extent that the upper net 7 and the porous plate 11 are not deformed by the pressure during filtration.

In addition, 14 in the figure is a partition cylinder to which the filter leaf 10 is attached, 1
Reference numeral 5 denotes a horizontal hole provided in the partition tube 14, which allows the filter leaf 10 and the hollow central shaft 3 to communicate with each other. Further, in the illustrated example, the bending portion 13b of the support wire 13 has a circular arc shape, but it may be bent in a V shape or other polygonal shapes.

(Function) This device is configured as described above, so
Most of the solid particles that pass through the upper net 7 during pre-coating to form a pre-coat layer on the filter leaves prior to filtration and during filter dregs removal pass through the holes in the perforated plate 11 and are connected to the support plate 5 and the porous Gap 12 with plate 11
It leaks into the filter, flows toward the center along with the filtrate, flows out through the hollow central shaft 3 to the lower part, and is no longer interposed inside the filter leaf.

However, when rotating the filter during filter slag removal,
Some of the solid particles that have passed through the upper net 7 and leaked into the filter leaf, and solid particles that happen to remain inside the filter leaf, are moved toward the outer circumference of the filter leaf 10 by the centrifugal force caused by the rotation of the filter body. However, the bent portion 13 of the support wires 13 arranged radially
b acts as an obstacle and prevents its movement, and instead of reaching the outer periphery of the filter leaf, it adheres to each support wire and remains.

The remaining solid particles attached to each support wire are swept away from the hollow central shaft 3 by the liquid flow during filter leaf cleaning or precoating.

At this time, the solid particles that adhere to and remain on each support wire can be easily flowed out because they are located in a portion where the flow rate of the cleaning liquid during filter leaf cleaning can be maintained.

(Effects of the invention) As is clear from the above explanation, the filter leaf structure of this invention eliminates the residual solid particles inside the filter leaf, and prevents solid particles that have leaked into the filter leaf. Even if the filter slag is removed, the support wires prevent movement due to the centrifugal force caused by the rotation of the filter body when removing the filter slag, and the slag can be completely flowed out and removed during the filter leaf cleaning.

Therefore, unlike conventional filter leaves, the accumulation of solid particles concentrated on the outer periphery of the filter leaf due to rotation of the filter body is eliminated, and the solid particles inside the filter leaf are naturally flowed out during normal operations, resulting in a long-term filtration capacity. It is expected to be effective in preventing damage to the upper net, and is particularly effective in filtering substances that solidify if left undisturbed even though they are aqueous solutions such as high viscosity liquids, and the service life of the filter leaves can be expected to be reduced. can be significantly extended.

[Brief explanation of the drawing]

FIG. 1 is a leaf filter, FIG. 2 is a longitudinal sectional view of a conventional filter leaf, FIG. 3 is a partially cutaway plan view of the filter leaf of this invention, and FIG. 4 is a longitudinal sectional view thereof. DESCRIPTION OF SYMBOLS 1... Filter body, 2... Filter body, 3... Hollow center shaft, 4... Filter leaf, 5... Support plate, 6... Support net, 7... Upper net, 8... Tightening ring,
9...Motor, 10...Filter leaf, 11...Perforated plate,
12...Gap, 13...Support wire, 14...
...Partition tube, 15...Horizontal hole, 16...Scraping board.

Claims (1)

[Scope of utility model registration request] A filter body is formed by attaching a plurality of horizontally structured filter leaves to a hollow central shaft and communicating the filter leaves with the hollow central shaft, and centrifugal force is applied to filter slag adhering to the filter leaves by rotation of the filter body. In the leaf-shaped filter, a perforated plate supporting the upper net is provided between the upper net constituting the filter leaf and the support plate, and a main portion extending in the radial direction between the perforated plate and the support plate. A leaf filter characterized in that a large number of support wires each having a continuous bent portion formed in the main portion thereof are arranged in a scattered manner in close proximity to each other.