JP4067983B2 - Screw type filter dehydrator - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a screw-type filter dehydrator for separating a two-layer fluid containing solids into a liquid and a solid and discharging them separately.
[0002]
[Prior art]
Screw-type filtration and dehydration devices usually have a conical pressure control valve that allows the moisture content of the dehydrated cake to be kept at a constant value and to increase or decrease the discharge rate to an appropriate amount, and is freely attachable to and detachable from the end opening of the cylindrical filter body. (See, for example, Patent Document 1).
[0003]
[Patent Document 1]
Japanese Utility Model Publication No. 63-53394 (Fig. 1-4)
[0004]
[Problems to be solved by the invention]
The annular gap between the end face of the cylindrical filter body, which is the outlet for the dehydrated cake, and the confronting surface of the conical pressure regulating valve, depends on the nature of the sludge to be separated and the amount of dehydrated cake discharged. In order to increase or decrease the moisture content, it must be finely adjusted to an appropriate value. This fine adjustment is performed by displacing the mounting position of the conical pressure regulating valve in the front-rear direction.
[0005]
However, the opening area of the annular gap changes geometrically in response to an arithmetic series change in the amount of movement of the conical pressure regulating valve. Therefore, it is extremely difficult to adjust the discharge amount and moisture content of the dewatered cake to desired values by moving the conical pressure regulating valve, and in reality, only rough adjustment is performed.
[0006]
The object of the present invention is to make sure that the fine adjustment to keep the moisture content at an appropriate value while increasing or decreasing the discharge amount of the dehydrated cake to an appropriate amount is made surely and quickly. An object of the present invention is to provide a screw-type filtration and dehydration apparatus.
[0007]
[Means for solving problems]
In the screw type filtration dewatering device according to claim 1 of the present invention, a cylindrical filter body in which a large number of annular filtration plates are arranged in a stacked manner with a gap between each other, and the slit is used as a drainage groove. And a screw conveyor is fitted in the center hole with the opening at the start end of the filter body as the inlet for sludge, a cylindrical casing is led out from the terminal opening of the filter body, and the sludge is opposed to the cylindrical casing. A cylindrical pressure regulating valve that opens the end surface on the inlet side and closes the other end surface is mounted on the screw shaft, and the cylindrical pressure regulating valve is slidable in the front-rear direction on the inner or outer peripheral surface of the cylindrical casing. A cylindrical pressure regulating valve or a cylindrical casing with a cut-out or hole-like see-through part on the cylindrical wall of the cylindrical casing to provide a dehydrated cake delivery port that communicates outward from the filter body. Adjust the mating state in the front-rear direction And configured to enable an opening area of said delivery port is increased or decreased by the. Further, in the invention according to claim 2, on the premise of the screw-type filtration and dehydration device according to claim 1, the notched or hole-like see-through portion provided on the tubular wall of the tubular pressure regulating valve or the tubular casing is provided. It is long in the axial direction and is formed so that the lateral width is kept substantially constant from the start end to the end.
[0008]
BEST MODE FOR CARRYING OUT THE INVENTION
The following examples will be described with reference to FIGS.
[0009]
Reference numeral 1 denotes a cylindrical filter body, in which a large number of annular filtration plates are arranged in a laminated form while holding the required slits, and the slits between the annular filtration plates serve as drainage outflow grooves 2. . A screw conveyor 5 is fitted into the center hole 4 at the opening at the start of the filter body 1 as a sludge feed port 3. 6 is a cylindrical casing led out from the terminal opening of the filter body 1, and 7 is a sludge inlet 3 side end face mounted on the screw shaft 5S facing the cylindrical casing 6 and the other end face is closed. It is a cylindrical pressure regulating valve. And, for example, the tubular pressure regulating valve 7 is fitted in the inner peripheral surface of the tubular casing 6 so as to be slidable in the front-rear direction, and a notched or hole-like transparent portion is formed on the tubular wall of the tubular pressure regulating valve 7. 9 is provided as a dewatering cake delivery port 8 that leads from the inside of the filter body 1 to the outside. As another embodiment, the cylindrical pressure regulating valve 7 is slid in the front-rear direction on the outer peripheral surface of the cylindrical casing 6. A dehydrated cake delivery port 8 that is fitted freely and is provided with a cut-out or hole-like through-hole (not shown) on the cylindrical wall of the cylindrical casing 6 to communicate outwardly from the inside of the filter body 1 is used. 11 is a set bolt for fixing the cylindrical pressure regulating valve 7 at a predetermined set position, and 12 is a prime mover for driving the screw conveyor 5.
[0010]
Then, by adjusting the fitting state of the tubular pressure regulating valve 7 by moving it in the front-rear direction, the effective opening area of the delivery port 8 is arbitrarily increased or decreased. In either case, it is desirable to form it so as to be long in the axial direction and to have a substantially constant lateral width from the start end to the end.
[0011]
[Action]
When the prime mover 12 is driven, the screw conveyor 5 rotates, and the filtered sludge is fed in the process in which the sludge fed into the filter body 1 from the feed port 3 advances in the axial direction while turning along the screw blade 5B. Flows out from the drainage grooves 2 and 2 and the dewatered cake is sequentially discharged from the front delivery port 8. The amount of the drainage and the moisture content of the dewatered cake are determined by the effective opening area of the delivery port 8. Regulated by. The effective opening area of the delivery port 8 varies depending on the pull-out length of the see-through portion 9, but the pull-out length of the see-through portion 9 increases or decreases in proportion to the amount of movement of the cylindrical pressure regulating valve 7 in the front-rear direction. To do. Therefore, the effective opening area of the delivery port 8 is increased by moving the cylindrical pressure regulating valve 7 in the front-rear direction by forming the width of the see-through portion 9 so as to be constant from the start end to the end. Will be changed in arithmetic series and fine adjustment will be easily performed. In addition, by forming the see-through portion 9 long in the axial direction, the increase / decrease adjustment width of the effective opening area of the delivery port 8 can be increased. Furthermore, when the cylindrical pressure regulating valve 7 rotates together with the screw shaft 5S, the small granular impurities mixed in the sludge are scraped along the side edge of the see-through portion 9, so that clogging may occur. Absent.
[0012]
【The invention's effect】
According to the screw type filtration and dehydration apparatus of the present invention, it is possible to make fine adjustments to correspond to the properties of the sludge to be separated, to increase or decrease the discharge amount of the dewatered cake to an appropriate amount, and to keep the moisture content at an appropriate value. This is advantageous in that it can be carried out reliably and quickly by a simple operation of the cylindrical pressure regulating valve, and the adjustment width can be increased. Furthermore, there is a secondary effect that clogging with small granular impurities can be prevented.
[Brief description of the drawings]
FIG. 1 is a longitudinal side view schematically showing the configuration of a screw type filtration dehydration apparatus of the present invention.
FIG. 2 is a longitudinal side view of a cylindrical pressure regulating valve in the screw type filtration dehydration device of the present invention, showing an example in which a cut-out see-through part is provided on a cylindrical wall.
FIG. 3 is a cross-sectional view taken along line AA in FIG.
FIG. 4 is a longitudinal side view of a cylindrical pressure regulating valve in the screw type filtration dehydration apparatus of the present invention, showing an example in which a hole-like see-through part is provided on a cylindrical wall.
5 is a cross-sectional view taken along line BB in FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Cylindrical filter body 2 Filtrate outflow groove 3 Sludge infeed port 4 Center hole 5 Screw conveyor 5S Screw shaft 6 Cylindrical casing 7 Cylindrical pressure control valve 8 Dehydrated cake delivery port 9 See-through part

Claims (2)

A large number of annular filter plates are arranged in a stacked manner with a gap between each other, and the slit is formed into a cylindrical filter body having a drainage groove, and the start end opening of the filter body is a sludge inlet. The cylindrical pressure is fitted with a screw conveyor in the center hole, the cylindrical casing is led out from the terminal opening of the filter body, the sludge inlet side end face is opened and the other end face is closed facing the cylindrical casing. A regulating valve is mounted on the screw shaft, and the cylindrical pressure regulating valve is fitted on the inner circumferential surface or outer circumferential surface of the cylindrical casing so as to be slidable in the front-rear direction. A cut-out or hole-like see-through part is provided on the wall to provide a dehydrated cake delivery port that leads from the inside of the filter body to the outside, and by adjusting the fitting state of the cylindrical pressure regulating valve in the front-rear direction, The effective opening area can be increased or decreased. And wherein the a, screw filtering and dewatering device.   A notched or hole-like see-through part provided on the cylindrical wall of the cylindrical pressure regulating valve or the cylindrical casing is formed so as to be long in the axial direction and to have a substantially constant lateral width from the start end to the end. The screw type filtration dehydrator according to claim 1, wherein

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