JP3567824B2 - Filter press - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an opening and closing device for an outlet of a filter press, which squeezes and dewaters sludge containing a large amount of minerals and fibers to intermittently take out a dewatered cake.
[0002]
[Prior art]
A filtration chamber is formed with a rotatable filter plate, and sludge is pressed in from the supply port on the start end side of the filtration chamber, which is regulated by a check plate fixed to the outer peripheral ring of the filtration chamber, while rotating the filter plate and the sludge. The applicant specially developed a filter press that generates frictional resistance between the filter plate and sludge and shear frictional resistance to squeeze and dewater, and intermittently removes dewatered cake from the outlet at the end of the filtration chamber. Proposed in Japanese Patent Application No. 11-218446.
[0003]
[Problems to be solved by the invention]
The filter press proposed by the applicant can process a large amount of data if a large number of filters are arranged in parallel, does not require a large installation space, and does not require consumables such as a filter cloth. For this reason, the slip resistance at the time of cake discharge due to the contact pressure between the dewatered cake and the outlet wall surface increases, and cake clogging and the like occur, causing an excessive load at that portion. The present invention provides an apparatus for solving the above-mentioned problem by devising a cake outlet.
[0004]
[Means for Solving the Problems]
The gist of the present invention is that a filtration chamber is formed by two disc-shaped filter plates fixed to a rotatable inner ring support and an outer ring slidably contacting the outer periphery of the filter plate. A check plate is fixed to the outer peripheral ring of the lower part, the side edge of the check plate is brought close to the filter plate, and the tip is slid on the inner ring support, and the filter is regulated by the check plate. In a device in which a sludge supply port is provided at the beginning of the chamber and a cake outlet is provided at an end of the chamber, an opening / closing lid is hung at one end of the outlet, and the lower end of the opening / closing lid is connected to the actuator piston. Connecting, closing the opening by inclining the opening / closing lid, forming the lower end of the dewatered cake into a triangular shape, discharging the cake, and supplying the washing water for washing the filter plate inside the check plate. A pipe is provided. Then, the opening / closing device for the outlet hangs the upper end of the opening / closing lid at the tip of the check plate, or connects the lower end of the opening / closing lid to the piston of the actuator, and contracts the piston to open the outlet. It will block.
[0005]
BEST MODE FOR CARRYING OUT THE INVENTION
The apparatus according to the present invention is configured as described above, closes the on-off valve of the cake outlet, presses sludge from the supply port while rotating the filtration chamber at a low speed, and the sludge is concentrated while rotating the filtration chamber. Sludge is dewatered by frictional resistance between the transferred filter medium and the contact surface. Eventually, a shear friction resistance is generated between the cake layer on the filtration surface and the relatively soft sludge in the center to promote dehydration, and further dehydration is performed while applying back pressure to the cake from the outlet. Then, when the lid is opened, the most dehydrated cake in the vicinity of the lid is dripped in a triangular shape at the lower end thereof, so that the cross-sectional area of the dehydrated cake gradually increases, and the cake is discharged. As the contact pressure between the cake and the outlet wall gradually increases, the slip resistance in the initial stage of discharge decreases, and the cake in the filtration chamber is continuously collected due to the frictional resistance between the filter medium and the contact surface due to the rotation of the filter plate. Can be discharged from the outlet.
[0006]
【Example】
The filter press according to the present invention will be described in detail with reference to the drawings. First, in FIGS. 1 and 2, reference numeral 1 denotes a disc-shaped filter plate having a large number of pores, and two disc-shaped filter plates 1. The inner peripheral edge of the inner ring support 1 is fixed to the inner ring support 2. An outer peripheral ring 4 fixed to the support plate 3 is disposed around the periphery of the filter plate 1, and a filtration chamber 5 is formed therein by the two filter plates 1, 1 and the outer peripheral ring 4. A drive shaft 6 is fitted into the inner ring support 2 to which the filter plate 1 is fixed, and the drive shaft 6 is rotatably supported by a bearing 8 fixed to a gantry 7. A sprocket 9 fitted to the end of the drive shaft 6 is connected to a driving machine (not shown), and rotates the two filter plates 1 to rotate the sludge in the filtration chamber 5. It is like that.
[0007]
As shown in FIG. 2, a check plate 10 is fixed to the outer peripheral ring 4 at a lower portion of the filtration chamber 5, and a side edge of the check plate 10 is brought close to the filter plate 1. The portion is slid on the inner ring support 2. The outer peripheral ring 4 before and after dividing the filtration chamber 5 by the check plate 10 is provided with a supply port 12 to which a sludge supply pipe 11 is connected and an outlet 13 for a cake formed in a rectangular tube. A rectangular opening / closing lid 14 is provided inside the outlet 13. As shown in FIGS. 2 and 3, the open / close lid 14 has its upper end suspended from the tip 10 a of the check plate 10, and the lower end of the open / close lid 14 is connected to the piston 16 of the actuator 15. Then, as shown in FIG. 2, the piston 16 is contracted, and the opening / closing lid 14 is inclined from the front end 10 a of the check plate 10 of the outlet 13 toward the lower end of the outlet 13 on the outer peripheral ring 4 side. If the outlet 13 is closed and the piston 16 is extended to open the outlet 13, the most dehydrated cake near the opening / closing lid 14 is such that the lower end portion of the cake is gradually reduced to the outlet 13. The contact pressure between the cake to be discharged and the wall surface of the outlet 13 is gradually increased so as to gradually increase the sliding resistance at the initial discharge. Reference numeral 17 denotes a sealing material provided on the periphery of the opening / closing lid 14.
[0008]
4 and 5, the upper end of a rectangular open / close lid 14a bent in a dogleg shape is hung on the lower part 4a of the outer peripheral ring 4 in the other embodiment shown in FIGS. The lower end of 14a is connected to the piston 16 of the actuator 15, the piston 16 is extended, and the lower end of the outer peripheral ring 4 to which the outlet 13 is connected is inclined from the lower part 4a to the lower part of the check plate 10, as shown in FIG. Then, the outlet 13 is closed, and the lower part of the bent rectangular opening / closing lid 14 a is brought into close contact with the lower end of the check plate 10. In FIG. 1, reference numeral 18 denotes a cover that covers the filter plate 1, which is fixed to the gantry 7, and is fixed to the support plate 3 having the outer peripheral ring 4 fixed to the periphery of the cover 18. A filtrate chamber 19 is formed between the cover 1 and the cover 18. Reference numeral 20 denotes a filtrate discharge pipe, reference numeral 21 denotes a supply pipe of washing water for cleaning the filter plate 1 from the inside of the check plate 10, and reference numeral 22 denotes a reinforcing plate of the filter plate 1.
[0009]
【The invention's effect】
As is apparent from the above description, in the filter press of the present invention, an opening / closing lid is hung at one end of the outlet of the dehydrated cake, and the lower end of the opening / closing lid is connected to the piston of the actuator, and the opening / closing lid is closed. The outlet is closed by inclining, and the most dehydrated cake in the vicinity of the opening / closing lid has a shape in which the cross-sectional area of the dewatered cake gradually increases because the lower end portion thereof hangs in a triangular shape at the outlet, and is discharged. Since the contact pressure between the cake and the outlet wall surface is gradually increased, the sliding resistance at the initial stage of discharge is reduced, and the cake in the filtration chamber can be continuously discharged from the outlet. By providing a supply pipe for washing water for washing the filter plate inside the check plate, clogging of the filter plate is eliminated.
[Brief description of the drawings]
FIG. 1 is a schematic side view of a filter press according to the present invention.
FIG. 2 is a longitudinal sectional front view of a filter press in which an outlet of a dehydrated cake is similarly closed.
FIG. 3 is a vertical sectional front view of the filter press in which an outlet is opened.
FIG. 4 is a vertical sectional front view of a filter press in which an outlet of another embodiment is closed.
FIG. 5 is a vertical sectional front view of a filter press in which an outlet of another embodiment is opened.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Filtration plate 2 Inner ring support 4 Outer ring 4a Lower part 5 Filtration chamber 10 Check plate 10a Tip part 12 Supply port 13 Outlet 14, 14a Opening / closing lid 15 Actuator 16 Piston
21 Cleaning water supply pipe

Claims (3)

Filtration by two disc-shaped filter plates (1, 1) fixed to a rotatable inner ring support (2) and an outer ring (4) slidably contacting the outer periphery of the filter plate (1). A chamber (5) is formed, and a check plate (10) is fixed to an outer peripheral ring (4) below the filter chamber (5), and a side edge portion of the check plate (10) is attached to the filter plate (10). 1), its tip is slid on the inner ring support (2) of the filter plate (1), and sludge is supplied to the start end side of the filtration chamber (5) regulated by the check plate (10). In a device in which a mouth (12) and a cake outlet (13) at the end side thereof are opened to the outer peripheral ring (4), the upper ends of the opening / closing lids (14, 14a) are suspended inside the outlet (13). Then, the lower end of the opening / closing lid (14, 14a) is connected to the piston (16) of the actuator (15), and the opening / closing lid (14, 14a) is inclined to close the outlet (13). The lower end portion of the cake was discharged by a triangular shape, characterized in that the inside of the check plate (10), is disposed in the supplying pipe (21) of the cleaning water for cleaning filtration plate (1) And filter press. The upper end of the opening / closing lid (14) is suspended from the tip (10a) of the check plate (10), and the lower end of the opening / closing lid (14) is connected to the piston (16) of the actuator (15). 2. The filter press according to claim 1, wherein the outlet is closed by contracting the filter. The upper end of the opening / closing lid (14a) is suspended from the lower part (4a) of the outer peripheral ring (4), and the lower end of the opening / closing lid (14a) is connected to the piston (16) of the actuator (15). 2. The filter press according to claim 1, wherein the outlet is closed by extending the opening.

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