JP2547039Y2 - Rotary single-chamber filter - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary single-chamber filter, and more particularly, to a filter cloth cleaning apparatus for a rotary single-chamber filter.

[0002]

2. Description of the Related Art A rotary single-chamber filter is a single-chamber type filter having a large opening rate of a drum and a large diameter of a filtrate tube, thereby having a large filtration capacity and maintaining a uniform flow of the washing liquid throughout the cake. It has a high cleaning effect because it can be blown back, and is always blown back by blowback air, so it can be easily peeled off even a cake that is difficult to filter. It is widely used in many fields such as general chemical industry, fertilizer industry, metal industry, and food industry.

[0003] The structure of a conventional rotary single-chamber filter will be described. FIG. 2 is a cross-sectional view showing the entire structure of the rotary single-chamber filter, and FIG. 3 is a cross-sectional view of a principal part of a cake peeling device and a filter cloth cleaning device of the filter. In the figure, 1 is a rotating drum driven by a variable speed reducer (not shown),
On its outer peripheral surface, a filter bridge 2 is provided continuously along the circumference, and on its surface, a filter cloth 3 is divided and stretched. On the peripheral wall of the drum 1, small-diameter filtrate holes 4 are provided at an appropriate pitch in two rows in the axial direction per filter bridge. A vat 5 stores the undiluted solution F, and a lower portion of the drum 1 is immersed to form a filtration area. Reference numeral 6 denotes a center pipe fixed to the center of the drum in the axial direction. A lower part of the center pipe is connected to a filtrate pipe 7 which is immersed in a filtration area of the drum and sucks out the filtrate to the outside.

Numeral 8 denotes a valve shoe made of a synthetic resin such as Teflon, which is in sliding contact with the inner peripheral surface of the drum 1 with a small gap, a plurality of which are fixed to the center pipe 6 by valve bars 9 respectively, and are arranged in the axial direction of the drum. They are arranged in a row. In the upper part of the valve shoe 8, a narrow slit 10 for introducing a blow gas such as nitrogen gas for cake separation into the filtrate hole 4 is provided in parallel with the axial direction of the drum. A cloth cleaning liquid slit 11 is provided in the axial direction of the drum, and is connected to a cleaning liquid pipe 13 in the center pipe 6 via a flexible pipe 12.

[0005] The operation of the filter cloth cleaning apparatus of the conventional rotary single-chamber type filter having the above-described structure will be described. The cake C formed on the surface of the filter cloth 3 in the filtration area in the stock solution vat 5 is drained as the drum 1 rotates, and reaches the upper part of the valve shoe 8 after passing through the cake washing unit 15. Here, the gas for the filter cloth back-blow flows in the order of the center pipe 6, the valve bar 9, the blow gas slit 10, and the filtrate hole 4, flows into the filter bridge 2, and blows from the back side of the filter cloth 3, so that the cake C is It is peeled off and discharged out of the machine via the cake chute 14. When the filter bridge 2 from which the cake C on the filter cloth surface has been removed reaches the cleaning liquid slit 11 of the valve shoe 8 next, the cleaning liquid pipe 1
3. The cleaning liquid flowing in the order of the flexible pipe 12, the liquid slit 11, and the filtrate hole 4 flows into the filter bridge 2 and cleans from the back side of the filter cloth 3. The filter cloth thus washed again enters the filtration zone, and the filtration operation is repeated.

[0006]

As a result of investigations, it was found that the following problems were found in the filter cloth cleaning apparatus of the conventional rotary single-chamber filter. That is, the filter cloth 3 is washed when the washing liquid is flowing into the filter bridge 2, and this is caused by the filtration holes 4 of the filter bridge to be washed.
Is in contact with the cleaning liquid slit 11 of the valve shoe 8. However, this filter is often operated with a high rotation of the drum in order to increase the filtration capacity, and since the drum 1 is operated under external pressure, the diameter and the number of filtrate holes are also limited due to the strength design. Due to the restriction, it was found that the time during which the cleaning liquid slit 11 was in contact with the filtrate hole 4 was extremely short, for example, 0.1 to 0.2 seconds. It was also found that the amount of the cleaning liquid flowing into the filter bridge in this short time is naturally limited because it is a liquid, and that the amount of the cleaning liquid for the filter cloth is not sufficient. The present invention has been made based on the above-mentioned problems of the related art, and it is an object of the present invention to provide an effective washing device for a filter cloth of a rotary single-chamber filter.

[0007]

The gist of the present invention for solving the above-mentioned problems is that a rotary drum (1) having a filter cloth (3) stretched around a peripheral surface thereof through a filter bridge (2). Is attached to a center pipe (6), the lower part is immersed in a stock vat (5) and filtered, and the cake formed on the outer surface of the filter cloth (3) is fixed to the center pipe (6) by a valve bar (9). that the rotary single-chamber filtration unit to recover peeled off by gas blown from the valve blow gas slit of the shoe (8) (10), the blow gas for lower position of the slit (10) of the valve shoe (8)
And the filtrate holes (4) to be blown on the rotating drum (1).
A) and the filtrate holes (4B) to be washed
Cleaning slit (16) provided at a position where the cleaning slit (10) does not abut at the same time as the cleaning slit (10).
6) connecting pipe (17) for communicating the valve bar (9)
And a spray unit (18) for spraying a cleaning liquid onto the outer surface of the filter cloth at an intermediate position between the blow gas slit (10) and the cleaning slit.

[0008]

The filter bridge (2), from which the cake on the filter cloth has been removed by blowback, comes to a position facing the spray means (18) with the rotation of the drum (1), and the high-speed washing liquid is discharged. Sprayed on the filter cloth, the cake remaining in the filter cloth is washed and removed, and the filter cloth becomes wet. In this state, when the filter bridge (2) reaches the position of the washing slit (16) provided below the valve shoe (8), the blowing gas flows from the filtrate hole (4) through the filter bridge (2). ), And pass through the filter cloth at high speed from the back side. At this time, since the filter cloth is in a wet state, the resistance of the openings is large, so that the fine powder of the cake remaining in the filter cloth is efficiently removed and washed.

In the above operation, even if the cleaning liquid is sprayed at a high speed, the filter cloth is supported by the filter bridge (2), so that there is no possibility of breakage. Also, even though the time when the filtrate hole (4) of the filter bridge contacts the cleaning slit (16) is short, the fluid flowing into the filter bridge is a gaseous substance. Therefore, the flow rate required for washing the filter cloth can be secured. Further, the distance between the blow gas slit (10) and the cleaning slit (16) of the valve shoe (8) is both
The filtrate holes (4A) which are blown at the same time
Since the distance does not contact the filtrate hole (4B) , the cleaning can be performed more effectively with a small amount of gas.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view of a main part of an embodiment of the present invention. In the figure, the same members as those in FIGS.
The same reference numbers are used. That is, 1 is a rotary drum, 2 is a filter bridge over which a filter cloth 3 is stretched,
Reference numeral 4 denotes a filtrate hole formed in the peripheral wall of the drum 1 and 6 denotes a drum 1
The center pipe 8 is fixed to the center of the drum, and 8 is a valve shoe that slides on the inner wall of the drum. Reference numeral 10 denotes an elongated blow gas slit provided in the upper part of the valve shoe 8 in parallel with the drum axis. Reference numeral 16 denotes an elongated cleaning slit provided in the lower part of the valve shoe 8 in parallel to the drum axis. Thereby, it communicates with the inside of the valve bar 9. A spray means 18 is provided at an intermediate position between the blow gas slit 10 and the cleaning slit 16 so as to face the surface of the filter cloth. 18A
And a plurality of spray nozzles 18B screwed into the nozzles.

The operation of the embodiment having the above configuration will be described. When the filter bridge 2 reaches the position of the blow gas slit 10 of the valve shoe 8 as the drum 1 rotates, the blow gas flows into the filter bridge 2 through the filtrate hole 4 and blows the filter cloth 3 from the back side. The cake is peeled off from the filter cloth and discharged out of the machine via the cake chute 14. When the filter bridge 2 from which the cake has been peeled in this way rotates downward and reaches a position facing the spray means 18, a high-speed cleaning liquid is sprayed on the filter cloth, and the amount of cake remaining in the filter cloth is removed. Is removed by washing, and the filter cloth becomes wet. In this state, when the filter bridge 2 rotates further downward and the filtrate hole 4 comes into contact with the cleaning slit 16, a considerable amount of blowing gas flows into the filter bridge 2 and passes through the filter cloth at a high flow rate. Meanwhile, the fine powder of the cake remaining in the filter cloth is efficiently removed and washed.

[0012]

According to the present invention having the above-described structure and operation, a high-velocity gas is blown from the back side of the filter cloth immediately after the cleaning liquid is sprayed by the spray means, so that the gas remains in the filter cloth. In addition, the cake fine powder can be efficiently removed, and the cleaning liquid is sprayed on the filter cloth supported by the filter bridge, so that there is no risk of damaging the filter cloth.

[Brief description of the drawings]

FIG. 1 is a sectional view of a main part of a filter cloth cleaning device of the present invention.

FIG. 2 is a cross-sectional view showing the entire structure of a conventional rotary single-chamber filter.

FIG. 3 is a cross-sectional view of a main part of a filter cloth cleaning device of a conventional rotary single-chamber filter.

[Explanation of symbols]

1: rotating drum, 2: filter bridge, 3: filter cloth,
4: filtrate hole, 5: stock solution vat, 6: center pipe,
7: filtrate tube, 8: valve shoe, 9: valve bar, 1
0: Gas slit, 11: Liquid slit, 12: Flexible tube, 13: Cleaning liquid tube, 14: Cake chute,
15: Cake washing part, 16: Slit for washing, 17: Connection pipe, 18: Spray means, C: Cake, F: Stock solution.

Claims (1)

(57) [Scope of request for utility model registration] 1. A rotary drum (1) having a filter cloth (3) stretched around a peripheral surface thereof through a filter bridge (2) is axially mounted on a center pipe (6), and the lower part is immersed in a stock solution vat (5). The cake formed on the outer surface of the filter cloth (3) is separated by a gas blown from a blow gas slit (10) of a valve shoe (8) fixed to a center pipe (6) by a valve bar (9). In a rotary single-chamber filter for collecting and recovering, a rotary drum is positioned below the blow gas slit (10) of the valve shoe (8).
(1) Blowed filtrate hole (4A) and filtrate to be washed
In the hole (4B), a slit (10) for blow gas
At the same time, a cleaning slit (16) provided at a position where it does not abut, a connecting pipe (17) communicating the cleaning slit (16) and the valve bar (9), a blow gas slit (10) and a cleaning slit And a spraying means (18) for spraying a cleaning liquid onto the outer surface of the filter cloth at an intermediate position of (1).