JP6061095B2 - Suction piping in vacuum filters - Google Patents

Description

The present invention relates to an improvement of a suction pipe attached to an outer peripheral portion of a drum, and more particularly to a suction pipe in a vacuum filter that facilitates uniform cake adsorption and maintenance.

While rotating a drum partly immersed in the stock solution tank, only the liquid component is discharged out of the drum through a filter wound around the outer peripheral surface through a suction tube disposed in the drum, and the solid component adhered to the filter A vacuum filter for recovering is generally well known.

Further, in Cited Document 1, a partition wall is erected on the outer periphery of a drum on which a filter plate is laid, and a filter chamber is formed by wrapping a filter cloth, and a plurality of filtrate circuits leading to each filter chamber are provided on the side plate of the drum. There is disclosed a vacuum filter that is arranged and integrated in a central portion of a drum side plate and connected to a suction pipe.

Japanese Utility Model Publication No. 51-75668

Conventionally, since a vacuum filter is provided with a suction pipe in the drum, it has been necessary for an operator to enter the drum during maintenance of the suction pipe. For this reason, the work environment is poor, and man-hours and costs are high. In addition, small vacuum filters that do not allow workers to enter the drums are hardly available on the market as the suction piping inside the drums cannot be installed.

Moreover, the vacuum filter of the cited document 1 is the structure which lays a filter board between a drum outer peripheral part and a filter cloth, and is suck | inhaled from the side of one drum connected between a drum outer peripheral part and a filter board, and is attracted | sucked inside a drum Piping is not installed.

However, since the filter plate for supporting the filter plate is laid over the entire circumference of the drum, the cost and the weight of the apparatus are increased. Further, since the filtrate circuit formed on the drum side plate is also used as a U-shaped steel reinforcing rib, it cannot be easily removed, and maintenance becomes difficult. Furthermore, since there is no description or suggestion of measures against non-uniform suction force for filter plates, filtrate circuits, etc., there is a risk of non-uniform distribution of suction force in the filtration chamber formed in the axial direction on the outer periphery of the drum. . Specifically, the suction force closer to the filtrate circuit (suction tube) becomes larger, and the solid component adsorbed on the filter cloth becomes thicker closer to the filtrate circuit (suction tube). If the distribution of suction force in the filtration chamber is uneven and the solid content adsorbed on the filter cloth is not uniform, there will be a problem in that the moisture content of the recovered solid content will vary widely, and the filtration area due to uneven precoat thickness. The problem of a decrease in

The present invention provides a suction pipe in a vacuum filter that makes the vacuum suction force on the drum surface uniform and makes the solid content laminated on the filter uniform thickness without installing a suction pipe inside the drum.

A solid drum that is fixed to the filter by draining only the liquid from the suction pipe through an endless filter wound around the drum, with the drum arranged rotatably supported on the stock solution tank. In a vacuum filter that collects components, a filter is formed around a support plate disposed on the peripheral surface of both ends of the drum and a plurality of partition plates extending between the support plates to form a plurality of filtration chambers, and a shaft and attaching a peripheral surface suction tube having a plurality of suction holes at a predetermined interval in the direction to the drum peripheral surface of the filtration chamber, to the outside of the side plate of the drum, rotating the one of the circumferential surface suction pipe and the other is provided on the shaft A side suction pipe that communicates with the valve is provided, which facilitates maintenance related to the suction pipe.

Further, when a plurality of suction holes are provided at predetermined intervals on both side surfaces of the peripheral suction pipe, and the suction hole on the other side surface is positioned at an intermediate position between adjacent suction holes on one side surface, the suction force in the filtration chamber is reduced. The distribution can be leveled, the solid thickness laminated on the filter can be made uniform, and the solid content with a stable low water content can be recovered.

Furthermore, if a filter plate with pores is stretched above the filtration chamber, and the filter is passed around the filter plate, the suction force in the filtration chamber does not act directly on the filter cloth even if the filtration area is increased, and the Can eliminate dehydration problems.

Since the suction pipe in the vacuum filter of the present invention does not have a suction pipe installed in the drum, it is not necessary for an operator to enter the drum and perform work during assembly / disassembly and maintenance. Therefore, the working environment is good and the working time and cost can be reduced. In addition, since the suction holes of the peripheral surface suction pipe attached to the drum peripheral surface are provided on both side surfaces, the suction hole on the other side surface is positioned at the intermediate position between the adjacent suction holes on one side surface. The suction force generated in the filter chamber can be leveled, and the solid thickness laminated on the filter can be made uniform. Therefore, stable solid-liquid separation processing is possible.

It is a side view of the vacuum filter concerning this invention. Similarly, it is a front view of a vacuum filter. Similarly, it is a perspective view of a peripheral suction tube. Similarly, it is principal part front sectional drawing of a vacuum filter. It is another Example of the vacuum filter which concerns on this invention.

An embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 is a side view of a vacuum filter. A drum 3 that is partly immersed in the stock solution tank 2 and is rotatably supported, a filtration chamber 5 that is partitioned by a plurality of partition plates 4 in the axial direction on the drum 3 circumferential surface, and each filtration chamber 5. A side suction pipe 6 disposed parallel to the partition plate 4 and a side attached to the side surface of the drum 3, one connected to the circumferential suction pipe 6 and the other connected to a rotary valve 7 provided at the axial center of the drum 3. The vacuum filter 1 is composed of a one-way suction pipe 8 and an endless filter 9 wound around the partition plate 4.

When the suction source is driven, the filtration chamber 5 is brought into a vacuum state via the suction pipe. The suction pipe is composed of a pipe (not shown) from the suction source to the rotary valve 7, a side suction pipe 8 and a peripheral suction pipe 6 from the rotary valve 7 to the filtration chamber 5.

When the inside of the filtration chamber 5 immersed in the stock solution tank 2 is sucked by the suction pipe, the solid-liquid mixture in the stock solution tank 2 is sucked into the filtration chamber 5. At this time, the solid content larger than the aperture ratio of the filter 9 is laminated on the filter 9, and the liquid content smaller than the aperture ratio of the filter 9 passes through the filter 9 and is collected as a filtrate through the suction pipe.

The solid content laminated on the filter 9 is scraped and collected by a scraper 11 disposed at the subsequent stage of the peeling roll 10. Further, water is sprayed from the cleaning nozzle 12 to clean and regenerate the solid content inside the filter 9. The filter 9 is formed in an endless shape by being wound around a plurality of guide rolls 13, and continuously separates the solid-liquid mixture in the stock solution tank 2 into solid and liquid.

FIG. 2 is a front view of the vacuum filter, in which side plates 14 and 14 are fixed on both sides of the cylindrical drum 3 to seal the inside of the drum 3. A shaft 15 is passed through the center of both side plates 14, 14, and the drum 3 is rotatably supported so that a part of the drum 3 is immersed in the stock solution tank 2 in a horizontal state.

Support plates 16 and 16 are provided on the peripheral surfaces of both ends of the drum 3 to hang the filter. The support plate 16 supports the filter 9 at a position higher than the circumferential suction pipe 6 and prevents the filter 9 and the circumferential suction pipe 6 from coming into direct contact.

A plurality of T-shaped partition plates 4 are axially extended between the support plates 16 at a predetermined interval, and the filter 9 is wound from above the support plate 16 and the partition plate 4. The space surrounded by the partition plates 4 and 4, the support plates 16 and 16, the drum 3 peripheral surface, and the filter 9 is defined as a filtration chamber 5. Adjacent filtration chambers 5 are blocked by the partition plate 4, and there is no traffic of gas or liquid. The upper plate 16a of the support plate 16 and the upper plate 4a of the partition plate 4 are located at the same height, and the filter 9 is wound around the upper plates 16a and 4a while being in uniform contact with each other.

FIG. 3 is a perspective view of the peripheral suction pipe. A peripheral suction pipe 6 is attached to the peripheral surface of the drum 3 of the filtration chamber 5 in the axial direction. One end of the drum 3 extends to the outside of the side plate 14 and communicates with a suction source through a side suction pipe 8. The peripheral suction pipe 6 evacuates the inside of the filtration chamber 5 and sucks the liquid that has passed through the filter 9 from the stock solution tank 2.

In this embodiment, the open surface of the U-shaped steel is fixed to the peripheral surface of the drum 3 so that a gap is not generated in the connection portion between the peripheral surface of the drum 3 and the peripheral surface suction tube 6, and the peripheral surface has a rectangular cross section. A suction tube 6 is formed. The peripheral suction pipe 6 is provided with a plurality of suction holes 17 at predetermined intervals in the axial direction in order to suck the filtrate in the filtration chamber 5. The suction hole 17 is opened at a position in contact with the circumferential surface of the drum 3 so that no filtrate remains in the filtration chamber 5.

The suction holes 17 are respectively provided on both side surfaces of the peripheral suction pipe 6, and when the suction hole 17 on the other side surface is positioned at an intermediate position between the adjacent suction holes 17 on one side surface, the suction hole 17 becomes a filtration chamber. The distribution of the suction force in the filtration chamber 5 becomes uniform by being dispersed in the filter 5.

In the present embodiment, the cross section of the peripheral suction pipe 6 is rectangular. However, if the cross section has the same function and effect, it may be configured in a semicircular shape or a triangular shape. You may attach to a surrounding surface so that attachment or detachment is possible.

FIG. 4 is a front sectional view of an essential part of the vacuum filter. The drum 3 has a peripheral surface extending outward from the side plate 14 and an end portion standing on the drum 3 peripheral surface. A support plate 16 composed of an annular upper plate 16a placed parallel to the drum 3 peripheral surface from the upper end of 16b is disposed.

On one side of the peripheral surface of the drum 3, a peripheral surface suction tube 6 extends outward beyond the side plate 14. On the inner side of the peripheral surface of the drum 3 of the extending portion, connecting tools 18 are attached at positions communicating with the peripheral surface suction pipes 6. Since the connector 18 is located outside the side plate 14, it can be easily attached and detached. A side suction pipe 8 is configured by connecting a suction pipe between the rotary valve 7 disposed on the shaft 15 and the connection tool 18. Since each side suction pipe 8 is integrated and connected to the rotary valve 7, the filtrate in the filtration chamber 5 is directly sucked from the suction hole 17 of the peripheral suction pipe 6 without using a complicated device. It can be discharged from the suction source via the side suction pipe 8 and the rotary valve 7. In addition, since the side suction pipe 8 is configured to be detachable, it can be easily disassembled and assembled.

The connector 18 is located outside the side plate 14, and the suction pipe for discharging the filtrate does not pass through the drum 3. Therefore, when the suction pipe is disassembled and assembled, it does not enter the drum 3 for work, and maintenance is facilitated. In addition, the connection tool 18 can use well-known techniques, such as a connection socket and a connection flange.

FIG. 5 shows another embodiment of the vacuum filter. In the case where the entire length of the drum 3 is long, a filter plate 19 having a large number of pores is detachably stretched above the filtration chamber 5 in accordance with the specifications. The filter 9 may be wound around the filter plate 19 as a reinforcing plate. If the filter plate 19 is configured to be divided for each of the filtration chambers 5..., The peripheral suction pipe 6 can be maintained with the minimum necessary effort.

The suction pipe in the vacuum filter according to the present invention is provided with a suction pipe that puts the filtration chamber in a vacuum state outside the drum. It is easy to attach and detach, and it is necessary for the worker to perform maintenance inside the drum as in the past. Absent.
Therefore, it is not necessary to take the large model back to the factory for maintenance, and work related to the suction pipe can be performed from outside with a good work environment, so that work time and cost can be reduced. In addition, it is possible to design a small model with no space for workers, and it can be applied to all vacuum filters from large to small.

DESCRIPTION OF SYMBOLS 1 Vacuum filter 2 Stock solution tank 3 Drum 4 Partition plate 5 Filtration chamber 6 Circumferential suction pipe 7 Rotary valve 8 Side suction pipe 9 Filter 14 Side plate 15 Axis 16 Support plate 17 Suction hole 19 Filtration plate

Claims (3)

A drum (3) rotatably arranged is supported on the stock solution tank (2), a part of the drum (3) is immersed, and an endless filter (9) wound around the drum (3) is passed through, In a vacuum filter that collects only the liquid component from the suction pipe and collects the solid matter fixed to the filter (9).
Support plates (16, 16) disposed on the peripheral surfaces of both ends of the drum (3);
A plurality of partition plates (4 ...) extending between the support plates (16, 16) are hung around a filter (9) to form a plurality of filtration chambers (5),
A peripheral suction pipe (6) having a plurality of suction holes (17 ... ) at predetermined intervals in the axial direction is attached to the drum peripheral surface in the filtration chamber (5),
Outside the side plate (14) of the drum (3),
A suction pipe in a vacuum filter, characterized in that a side suction pipe (8) communicating with a rotary valve (7) provided on one side of the peripheral surface suction pipe (6) and the other is provided on a shaft (15).
A plurality of suction holes (17...) Are provided at predetermined intervals on both side surfaces of the peripheral surface suction pipe (6), and the suction holes (17 on the other side surface are disposed at an intermediate position between adjacent suction holes (17) on one side surface. The suction pipe in the vacuum filter according to claim 1, wherein: The vacuum according to claim 1 or 2, wherein a filter plate (19) having pores is stretched above the filter chamber (5), and the filter (9) is hung around the filter plate (19). Suction piping in the filter.

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