JPH051287Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention is a filtration device, and more specifically, a filtration device that can adjust the concentration of dewatered water and easily discharge concentrated raw materials accumulated in the device. It is related to.

[Conventional technology]

BACKGROUND OF THE INVENTION As a filter used when dewatering pulp in a pulp manufacturing factory, there is a type in which a plurality of disk-shaped filter members are attached to a rotating shaft (hereinafter abbreviated as diskext).

The disk-shaped filter member (hereinafter referred to as disk)
The device consists of a number of disks mounted at equal intervals perpendicular to the axis of rotation, each of which is divided radially into a number of sectors, with wire mesh stretched over both sides of each sector, and the lower sector being immersed in the liquid to be treated.

Then, by rotating the rotating shaft, supplying the raw material to be processed to the disk extract, and creating negative pressure inside the sectors, the solid content is captured on the surface of the wire mesh of the sector, while the moisture is trapped through the wire mesh. The raw material to be treated is guided into a plurality of sectors and is concentrated or dehydrated.

[Problem that this invention attempts to solve]

Although the disk extract has high dewatering efficiency and is excellent for processing mechanical pulp with high dewatering resistance, raw materials with high dewatering properties, such as kraft pulp with a low beating degree, are dehydrated more than necessary, so it is difficult to use the equipment. In particular, between the disc-shaped filtration member attached to the rotating shaft and the bottom of the butt of the device,
Excessive concentrated raw material may accumulate, resulting in poor discharge, and in order to make the excessively dehydrated concentrated raw material the proper moisture content, water must be added at the outlet side to adjust the concentration to the appropriate concentration, making operation difficult. It's complicated.

This invention improves the shortcomings of conventional disk extract in the processing of low-definition kraft pulp, and provides a disk extract that can adjust the concentration of concentrated raw materials and easily discharge excess concentrated raw materials that have accumulated in the equipment. The purpose is to provide the following.

[Means to solve the problem]

This invention is attached to the rotating shaft of DiskExt and is divided into multiple sectors. Part of the sector is removed, a scraping blade is attached to the removed part, and the drain pipe is adjusted. This filtration device is equipped with a valve, and adjusts the amount of water discharged by adjusting the opening degree of the valve.

The sectors formed on the disk are equally divided around the rotating shaft, and a portion of the sector is removed, and a scraping blade is attached to the removed portion.

The scraping blade has an oblique blade formed from a tip end of the side surface of the sector located at the rear in the rotational direction of the rotational shaft to a position near the rotational shaft of the sector side surface at the front in the rotational direction. In this case, the shape of the blade is either a straight blade with an angle of 35 to 45 degrees with the sector side located behind the rotational direction of the rotational shaft, or an arcuate blade that curves and protrudes in the rotational direction. Also good.

Furthermore, although the scraping blade may be installed at one location, it is desirable to attach it to multiple locations symmetrically with respect to the rotating shaft. For example, if the structure is divided into 12 sectors around the rotation axis, the fourth sector,
All you have to do is remove the 8th and 12th sectors and attach scraping blades to them.

However, since reducing the number of sectors will reduce the dewatering performance, it is desirable that the replacement ratio of the scraping blades be within 15 to 45%.

That is, if the exchange ratio with the scraping blade is less than 15%, the concentrated raw material, especially the excessively concentrated raw material, will not be sufficiently discharged, whereas if it exceeds 45%, the dewatering efficiency may be affected.

On the other hand, in the disk extract of the present invention, an adjustment valve is attached to the drain pipe. The regulating valve is not a special one, and any commonly used valve may be used as long as it can appropriately adjust the amount of water removed.

[Effect]

The present invention can be used in exactly the same way as the conventional disk extract, and after supplying the raw material to be processed into the vat, the rotary shaft is rotated, and the inside of the multiple sectors formed in the multiple disks is pressurized under negative pressure. Then, the solid content in the raw material to be treated is trapped on the wire mesh surface of the sector, while the water is guided into the sector through the wire mesh, and the solid content trapped on the wire mesh surface is trapped by the rotation of the sector. Then, it is sequentially peeled off from the wire mesh and dehydrated or concentrated.

Therefore, since disk extract has a high dewatering efficiency, materials with high dewatering properties such as kraft pulp with a low beating degree are dehydrated beyond proper dehydration or concentration, and as a result, the processed material is excessively dehydrated. remains at the bottom of the device, making it difficult to remove the processed material.

The present invention attaches a regulating valve to the drainage pipe, and in the case of highly dehydrating raw materials, the opening degree of the regulating valve is adjusted to dehydrate or concentrate, making it easy to adjust the water content of the material to be processed. can.

Furthermore, in the present invention, since the scraping blade is attached to the disk, the raw material to be processed at the bottom of the device is gradually forcibly scraped out toward the take-out side by the scraping blade as the disk rotates. There is no stagnation.

In addition, since the scraping blades of the present invention are angled, they can push out the solids that have accumulated on the rotating shaft toward the outer circumference, and the solids that have accumulated between the disks can also be easily scraped out. be able to.

The present invention is particularly effective in the case of excessively concentrated raw materials.

〔Example〕

1 and 2 show one embodiment of the present invention, and the present invention will be specifically explained below with reference to these drawings. In the device 1 of the present invention, a rotating shaft 3 is installed in a vat 2, a drum 4 is attached to the rotating shaft 3 coaxially with the axis of the rotating shaft 3, and a drum 4 is attached to the outer peripheral surface of the drum 4. A plurality of disks 5 are mounted at right angles to the axis and at equal intervals.

As shown in FIG. 2, the disk 5 consists of a plurality of fan-shaped sectors 6 divided into twelve equal parts in the radial direction, and each of these sectors 6 is hollow inside, and wire mesh is stretched on both sides of the sector 6. Each of the internal hollow portions communicates with the inside of the drum 4.

Furthermore, the sectors located at the 4th, 8th and 12th positions among the sectors 6 are removed, respectively;
Scraping blades 7a, 7b,
7c is attached.

The scraping blade 7a is a diagonal blade that forms an angle of 45° with the side surface of the sector 6 behind the rotating direction of the rotating shaft 3 (in the direction of the arrow in FIG. 2), and the scraping blade 7b has an angle of 35°. The scraping blade 7c is an oblique blade made of an angle, and the scraping blade 7c is an arcuate blade that curves and protrudes in the direction of rotation.

In FIG. 2, the scraping blades 7a, 7 are shown as described above.
Although b and 7c have different blade shapes, these scraping blades may each have the same blade shape.

Further, the scraping blade has a plurality of disks 5.
It may be attached to all disks, or it may be attached to every other disk 5. More disks 5
The scraping blades may be attached between sectors 6 at the same location or between different sectors 6 as desired.

Further, in the device 1 of the present invention, a regulating valve 9 is attached to a drain pipe 8 for discharging waste water from the drum 4. The reference numeral 10 in FIG. 2 is a supply box for the raw material to be processed, the reference numeral 11 is a shelter for taking out the dehydrated or concentrated raw material to be processed, and the reference numeral M in FIG. 1 is a motor for driving the rotating shaft. The raw material to be processed is supplied into the vat 2 from the supply box 10 in exactly the same way as the conventional disk extract, and
At the same time as the drum 4 is rotated, by creating a negative pressure inside the drum 4, the water of the raw material to be treated passes through the wire mesh in the sector 6, is sucked into the hollow part of the sector 6, is guided into the drum 4, and is further passed through the drain pipe 8. It is discharged through.

The raw material to be treated, which has been concentrated through dehydration, is captured on the surface of the wire mesh in a plurality of sectors 6, and is gradually peeled off from the wire mesh by the rotation of the rotating shaft 3 and accumulated at the bottom of the vat 2. Since the scraping blades 7a, 7b, and 7c attached to the scraper blades 7a, 7b, and 7c sequentially send the raw material to the take-out shelter 11 and take it out, there is no possibility that the concentrated raw material to be processed remains at the bottom of the vat 2.

FIG. 3 shows another example of the scraping blade of the present invention, in which scraping blades 12a and 12b are further attached at substantially the same angle from the inner shafts of the scraping blades 7a and 7b. In this case, the inner scraping blades 12a, 12b can push out the solid content accumulated between the disks toward the outer circumference, and the solid content accumulated between the disks can also be easily scraped out.

Furthermore, in the apparatus 1 of the present invention, an adjustment valve 9 is attached to the drainage pipe 8, and when the raw material to be treated is highly dewaterable, for example, kraft pulp with a low beating degree, the amount of drainage is controlled by the adjustment valve 9. Since it can be adjusted, it can be applied to various raw materials, and the amount of water to be dehydrated or the amount of water in the concentrated raw material can be adjusted as appropriate.

[Effect of idea]

As described above, the present invention is capable of preventing the raw material to be processed from staying in the vat by installing scraping blades between the sectors of the disk extract and by installing an adjustment valve to the drain pipe. Since the waste water can be adjusted using the adjustment valve, it is possible to process various raw materials from those with high freeness to those with low freeness, and the amount of dewatering or concentration ratio can be adjusted as appropriate, making it a versatile product. It can be made to be expensive.

[Brief explanation of drawings]

Fig. 1 is a front view showing a partial cross-section of an embodiment of the present invention, Fig. 2 is a view taken along the line shown in Fig. 1, and Fig. 3 is an explanatory diagram of another type of scraping blade. . 2...butt, 3...rotating shaft, 4...drum,
5...Disk, 6...Sector, 7a, 7b,
7c, 12a, 12b... scraping blade, 8...
Drain pipe, 9...adjustment valve.

Claims (1)

[Scope of utility model registration request] In a filtration device in which a plurality of disc-shaped filtration members are attached to a rotating shaft, a part of a plurality of small chambers divided in a plurality of radial directions formed in the plurality of disc-shaped filtration members is removed, A filtration device characterized in that a scraping blade is attached to the removed portion, and an adjustment valve is attached to the drain pipe.