JP2001025618A - Filtering dehydrator fitted with washing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform the washing of the interior of a filtering dehydrator by self-washing function reutilizing a filtrate generated at a time of filtering dehydration without relying on a means for introducing washing water from the outside. SOLUTION: In a fittering dehydrator wherein the spiral delivery mechanism 6 ranging from a rear solid-liquid mixture charging port 7 to a front solid discharge port 8 is provided to the upper part of a filtrate housing tank 1 having a filtrate discharge pipe 2 disposed at the lower part thereof to be led out therefrom through a flooding weir 3 and solid-liquid separation is performed by the rotation of the spiral delivery mechanism 6 and the eccentric rotary motion of a laminated disk, an underwater pump 13 operated by the signal of a liquid level sensor 17 is arranged to the lower part in the filtrate housing tank 1 and a discharge pipe 14 is led out upwardly from the liquid surface of the tank 1 to mount a washing nozzle 15 on the leading end part of the discharge pipe and the return stirring pipe 16 branched from the discharge pipe 14 to be opened to the liquid in the tank 1 is turned downward.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a filter and dehydrator provided with a washing device.

[0002]

2. Description of the Related Art Filtration and dewatering machines for filtering and dehydrating water from sludge with high water content to sludge with low moisture content by a spiral feeding mechanism and rotating motion of a laminated annular plate have long been known. Conventionally, however, this type of filter dewatering machine does not have a self-cleaning function, so that fine sludge contained in a large amount in the filtrate adheres to the wall surface of the filtrate storage tank or the plate surface of the laminated annular plate, and this adhered fine sludge. Gradually grows into a large sludge mass, which eventually does not only hinder the drainage of the filtrate but also impairs the filtration and dewatering function. In order to remove the adhered sludge, a manual cleaning operation or a method of introducing cleaning water from the outside and driving a separately supplied cleaning device has been adopted. Therefore, a large cost is required.

[0003]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a method for cleaning a filtrate in a filter dewatering machine without resorting to a troublesome cleaning operation by manual labor, a separate cleaning device, and introduction of cleaning water from outside. An object of the present invention is to provide a filter dehydrator provided with a washing device, which does not impair the filtration and dehydration function by the self-cleaning function of reusing as water and does not hinder the drainage of the filtrate.

[0004]

In the filter dehydrator provided with the washing device according to the present invention, a part or the entire inner diameter of the upper part of the filtrate storage tank from which the filtrate discharge pipe is led out from the lower part through the overflow weir. A large number of movable annular plates, each of which has a smaller diameter than the outer periphery of the helical portion of the spiral body described below, are arranged in a stacked manner while maintaining a slight interval in the axial direction. Alternatively, a large number of annular intermediate plates formed with a diameter larger than that are interposed between the stacks of the movable annular plates, and a gap-like shape extending from the inner diameter direction to the outer diameter direction between adjacent plate surfaces of these plate bodies. A liquid outflow groove is formed, and a spiral driven by a motor is extended from a solid-liquid inlet in the rear to a solid outlet in the front to form a spiral feeding mechanism, and the spiral is formed of a movable annular plate and an annular intermediate plate. As the spiral is rotated, The moving annular plate is configured to perform eccentric rotational movement along the plate surface of the annular intermediate plate, and when the spiral feeding mechanism is driven, the solid-liquid input from the solid-liquid input port is transferred in the axial direction, and the filtrate is in the liquid outflow groove. A submersible pump that is operated by a signal from a liquid level sensor in the lower part of the filtrate storage tank in a filter dehydrator configured so that solids that have been drained out and have a reduced water content can be discharged from the solids discharge port in front. Was installed, a discharge pipe was led out onto the liquid surface, a cleaning nozzle was attached to the tip of the discharge pipe, and a return stirring pipe branched from the discharge pipe and opened into the liquid was guided down.

[0005]

When the prime mover is driven, the spiral body rotates, the movable annular plate performs eccentric rotational movement along the plate surface of the annular intermediate plate, and the solid liquid supplied from the solid-liquid inlet is stacked with the movable annular plate and the annular plate. In the process of flowing into the center hole of the intermediate plate and advancing in the axial direction while rotating along the spiral, the filtered liquid flows out of the liquid outflow groove between the laminated plate members and falls into the filtrate storage tank. The solids which have been dehydrated and have a low water content are sequentially discharged from the front solids discharge port. When the inside of the filtrate storage tank rises to a predetermined liquid level due to the fall of the filtrate, the filtrate is ejected from the washing nozzle by the operation of the submersible pump to perform the washing operation in the machine, and the filtrate is stored by the return liquid from the return stirring pipe. The agitating action in the tank is performed, and the filtrate that has passed through the overflow weir is discharged from the filtrate discharge pipe in a timely manner.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The embodiments will be described below with reference to the drawings.

1 is a filtrate storage tank, 2 is a filtrate discharge pipe drawn out from the lower part of the filtrate storage tank 1 through an overflow weir 3, 4 is a spiral body driven by a motor 5 such as a motor, and 6 is a filtrate storage tank. A spiral feeding mechanism formed by extending the spiral body 4 from the rear solid-liquid inlet 7 to the front solid-liquid outlet 8 above the tank 1, 9... 9 is a movable ring made of a thin metal plate A large number of plates are arranged in a laminated manner while maintaining a slight interval in the axial direction from the solid-liquid input port 7 to the solid component discharge port 8. In order to fit eccentrically along the outer circumference, a part or the entire circumference of the inner diameter b is perforated so as to have a smaller diameter than the peak diameter M of the spiral body 4 and a larger diameter than the valley diameter G. Reference numeral 10 denotes an annular plate made of a thin metal plate, and is predetermined via spacers S... S according to a state interposed between the stacks of the movable annular plates 9. A large number of sheets are supported by the fixed body 11 at intervals, and the inner peripheral surface is fitted substantially concentrically with the outer periphery of the ridge of the spiral body 4, so that the inner diameter B is equal to or slightly smaller than the ridge diameter M of the spiral body 4. It is perforated to have a large diameter. The spiral body 4 is inserted through the central holes of the movable annular plates 9... 9 and the annular interlayer plates 10... 10 on which the spiral body 4 is laminated. Since the diameter difference is given to the inner diameter B of the annular disc 10, if the spiral body 4 rotates, the outer periphery of the hill portion presses the inner diameter surface of the movable annular plate 9 along the inner diameter face of the annular disc 10. The movable annular plate 9 is caused to perform an eccentric rotational movement. Also, between the plate surfaces of adjacent plate bodies 9, 10,..., 9, 10, a gap-shaped liquid outflow groove 12 extending from the inner diameter direction to the outer diameter direction.
.. 12 are formed. Reference numeral 13 denotes a submersible pump installed at a lower portion in the filtrate storage tank 1, and a washing nozzle 15 called a flash ball or the like is attached to a distal end of a discharge pipe 14 led out onto the liquid surface. The return stirring pipe 16 branched from the discharge pipe 14 and opened into the liquid is led down,
It is electrically connected to operate according to the detection signal of the liquid level sensor 17. Note that, depending on the properties of the solid-liquid to be subjected to the filtration and dehydration, a large number of liquid extraction holes 18 are provided on the peripheral surface of the cylindrical body from the rear solid-liquid inlet 7 to the front solid component outlet 8.
.., And a filter tube 19 provided with 18 is used to form the annular disc 10.
It is desirable to have a structure surrounding the outer periphery of 10.

In the case where the cake is discharged by filtering and dewatering the high-water content sludge, the high-water content sludge introduced from the solid-liquid inlet 7 is supplied to the movable annular plates 9. ······································································ Although the fluid flows into the center hole of 10, it is gradually filtered while turning in the axial direction while rotating due to the rotation of the spiral body 4 and the eccentric rotational motion of the movable annular plate 9. The sludge that has flowed out of the outflow grooves 12... 12 and further falls from the inside of the filter cylinder 19 through the extraction holes 18. From the solids discharge port 8 and discharged as a cake. While there is no filtrate in the filtrate storage tank 1, the submersible pump 13 is stopped. However, when the filtrate falls to a predetermined liquid level in the filtrate storage tank 1 due to the fall of the filtrate, the detection signal of the liquid level sensor 17 is received and the underwater pump 13 is stopped. When the pump 13 is driven, the filtrate in the filtrate storage tank 1 is jetted from the washing nozzle 15 and the liquid extraction holes 18... 18 and the liquid outflow grooves 12.
... Prevent clogging of 12 and return stirrer tube 1
The agitation effect of the return liquid from 6 prevents sludge from accumulating on the bottom of the filtrate storage tank 1. The washing action and the stirring action using the filtrate falling into the filtrate storage tank 1 are performed by periodically driving the submersible pump 13 by using both the timer control and the signal control from the liquid level sensor 17 to set the timer setting condition. By changing, the operation cycle and operation time of the submersible pump 13 can be arbitrarily increased or decreased. Then, the filtrate that has passed through the overflow weir 3 is discharged from the filtrate discharge pipe 2 as appropriate.

[0009]

According to the present invention, since the inside of the filtration and dehydration machine is cleaned by the internal cleaning device, the filtration and dehydration function is not impaired by long-time use, and the drainage of the filtrate is also prevented. There is no hindrance. This eliminates the need for cumbersome manual cleaning work as in the related art, and also eliminates the need for a large-scale work of separately loading a cleaning device. Moreover, since the above-mentioned in-machine washing is performed by a self-washing function of reusing a filtrate generated at the time of filtration and dehydration without depending on a means of introducing washing water from outside, it is extremely rational and industrial use. Sex is enormous.

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram of a machine of the present invention.

FIG. 2 is a vertical sectional side view of a main part according to an embodiment of the present invention, showing a relation between a movable annular plate, an annular spacer, and a spiral body.

FIG. 3 is a longitudinal sectional front view of a main part in another embodiment of the present invention, showing an example in which an outer periphery of an annular spacer is surrounded by a filtrate tube.

FIG. 4 is a vertical sectional front view of a spiral body in the machine of the present invention.

FIG. 5 is a front view of the movable annular plate in the machine of the present invention, showing an example in which the entire circumference of the inner diameter is formed smaller than the outer circumference of the ridge of the spiral.

FIG. 6 is a front view of the movable annular plate in the machine of the present invention, showing an example in which a part of the inner diameter is formed smaller than the outer circumference of the ridge of the spiral.

FIG. 7 is a front view of an annular disc in the machine of the present invention.

FIG. 8 is an operation flowchart of the cleaning apparatus according to the embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Filtrate storage tank 2 Filtrate discharge pipe 3 Overflow weir 4 Spiral body 5 Prime mover 6 Spiral feeding mechanism 7 Solid-liquid inlet 8 Solids discharge port 9 Movable annular plate 10 Annular plate 12 Liquid outflow groove 13 Submersible pump 14 Discharge pipe 15 Washing Nozzle 16 Return stirring pipe 17 Liquid level sensor

Continued on the front page (72) Inventor Mitsuo Kodama 4-16-40, Tsurumi-ku, Tsurumi-ku, Osaka-shi, Osaka Inside Tsurumi Seisakusho Co., Ltd. F-term (reference) in company Teera separation 4D026 BA03 BB01 BC23 BC26 BC30 BF06 BF09 BF19 BF20 BF22 BH00

Claims (1)

[Claims] In the upper part of a filtrate storage tank from which a filtrate discharge pipe is drawn out from a lower part via an overflow weir, a part or the whole peripheral part of an inner diameter is formed to have a diameter smaller than the outer peripheral part of a mountain part of a spiral body to be described later. A number of movable annular plates are arranged in a stacked manner while maintaining a slight interval in the axial direction, and a plurality of annular plates having an inner diameter equal to or larger than the outer periphery of the helical portion of the spiral body described later. The intermediate plate is interposed between the stacks of the movable annular plates, and a liquid-like liquid outflow groove extending from the inner diameter direction to the outer diameter direction is formed between the adjacent plate surfaces of these plate members, and the spiral body driven by the prime mover is formed. By extending from the rear solid-liquid input port to the front solid component discharge port to constitute a spiral feeding mechanism, and by inserting the spiral body into the center hole of the movable annular plate and the annular intermediate plate, the spiral body rotates with the rotation of the spiral body. The movable annular plate performs eccentric rotational movement along the surface of the annular disc. When the spiral feeding mechanism is driven, the solid-liquid input from the solid-liquid input port is transferred in the axial direction, the filtrate is discharged from the liquid outflow groove, and the solid having a low water content is solidified in the front. In the filter dewatering machine configured to be discharged from the minute discharge port, a submersible pump operated by the signal of the liquid level sensor is installed in the lower part of the filtrate storage tank, and the discharge pipe is led out to the liquid level and its tip A washing nozzle is attached to the outlet and a return stirring pipe branched from the discharge pipe and opened into the liquid is guided.
A filtration dehydrator with a washing device.