JP3567825B2 - Filter press - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a filter press for compressing and dewatering sludge containing a large amount of minerals and fibers to take out a dewatered cake intermittently. The improvement of the take-out opening.
[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 circumferential ring of the filtration chamber, while rotating the filter plate and the sludge. FIG. 4 shows an apparatus for generating frictional resistance between a filter plate and sludge and shearing frictional resistance to squeeze and dewater and take out a dehydrated cake intermittently from an outlet at the end of a filtration chamber. The applicant has proposed a filter press 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 starting end of the chamber and a cake outlet is provided at the terminal end thereof in the outer peripheral ring, the check plate is inclined in the rotation direction of the filter plate, and the discharge passage of the outlet is provided in the filtration chamber. From the side to the discharge side, the cross-sectional area of the discharge port is gradually increased to facilitate the removal of the cake, and the inside of the check plate is washed for cleaning the filter plate. A water supply pipe is provided . It is a thing. If the outlet of the outlet is inclined in the direction of rotation of the filter plate, the contact pressure between the dewatered cake and the outlet wall surface can be further reduced.
[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. When the lid is opened, the most dehydrated cake in the vicinity of the lid is guided along the inclined surface of the check plate, the cross-sectional area of the discharge port is gradually increased, and the slip resistance at the initial discharge is reduced. And the cake in the filtration chamber can be continuously discharged from the outlet by frictional resistance between the filter medium and the contact surface due to rotation of the filter plate.
[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. 1, a check plate 10 is fixed to an outer peripheral ring 4 at a lower portion of the filtration chamber 5, and the check plate 10 has a side edge close to the filter plate 1 and a tip thereof. 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 cylindrical cake. The outlet 13 makes the lower end of the outer peripheral ring 4 hang down, and the check plate 10 is inclined downward in the direction of rotation of the filter plate 1 from the front end to the lower end to extend the lower end of the check plate 10. The discharge passage of the outlet 13 is expanded from the filtration chamber side to the discharge side. The shape of the cake discharge passage has a shape that gradually expands continuously as it approaches the discharge port, and the cross-sectional area of the discharge port increases, so that the dewatered cake is guided along the inclined surface of the check plate 10. The cake is easily taken out by increasing the cross-sectional area of the outlet. The outlet 13 shown in FIG. 3 is another embodiment, in which the discharge portion 13 a of the outlet 13 is inclined downward in the rotation direction of the filter plate 1, and The contact pressure is reduced and the sliding resistance is reduced.
[0008]
A flat opening / closing lid 14 is provided at a discharge portion 13a of the outlet 13, and as shown in FIG. 2, this opening / closing lid 14 is connected to a piston 16 of an actuator 15 to extend and retract the piston 16. The opening / closing lid 14 is slid to open and close the discharge portion 13a of the outlet 13.
Reference numeral 17 denotes a cover that covers the filter plate 1, which is fixed to the gantry 7 and is fixed to the support plate 3 to which the outer peripheral ring 4 is fixed around the periphery of the cover 17. A filtrate chamber 18 is formed between them. Reference numeral 19 denotes a filtrate discharge pipe, reference numeral 20 denotes a supply pipe of washing water for cleaning the filter plate 1 from the inside of the check plate 10, and reference numeral 21 denotes a reinforcing plate of the filter plate 1.
[0009]
【The invention's effect】
As described above, in the filter press of the present invention, the check plate for regulating the filtration chamber is inclined in the rotation direction of the filtration plate, and the discharge passage of the outlet is expanded from the filtration chamber side to the discharge side. Since the cross section of the outlet is gradually increased, the cake can be easily taken out by increasing the cross section of the outlet. In addition, if the outlet of the outlet is inclined downward in the direction of rotation of the filter plate, the sliding resistance due to the contact pressure between the dewatered cake and the wall surface of the outlet is reduced, and the dewatered cake is removed as in the conventional device. Also, the contact pressure between the outlet and the wall surface of the outlet does not increase, so that a large load is not generated on the outlet. Further, since a supply pipe of washing water for washing the filter plate is provided inside the check plate, clogging of the filter plate is eliminated.
[Brief description of the drawings]
FIG. 1 is a vertical sectional front view of a filter press according to the present invention.
FIG. 2 is a schematic side view of a filter press according to the present invention.
FIG. 3 is a longitudinal sectional front view of a filter press according to another embodiment.
FIG. 4 is a vertical sectional front view of a filter press of a conventional apparatus.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Filtration plate 2 Inner ring support 4 Outer ring 5 Filtration chamber 10 Check plate 12 Supply port 13 Outlet 13a Discharge part
20 Cleaning water supply pipe

Claims (2)

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 in the outer peripheral ring (4), the check plate (10) is inclined in the rotation direction of the filter plate (1) to remove the cake. The discharge passage of the outlet (13) is expanded from the filtration chamber (5) side to the discharge side, and a supply pipe of washing water for washing the filtration plate (1) is provided inside the check plate (10). (20) was arranged Filter press characterized the door. 2. A filter press as claimed in claim 1, wherein the outlet (13a) of the outlet (13) is inclined in the direction of rotation of the filter plate (1).

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