Continuous squeeze-dewatering device

Details Continuous squeeze-dewatering device Continuous squeeze-dewatering device

2000-05-02

2002-10-08

Savage, Matthew O. (Department: 1723)

Liquid purification or separation

Plural distinct separators

Filters

C201S045000, C201S045000, C201S045000, C201S045000, C201S045000, C201S045000, C201S045000, C201S045000, C201S045000, C201S045000, C366S309000, C366S330700, C416S237000, C416S24100B

Reexamination Certificate

active

06461507

ABSTRACT:

TECHNICAL FIELD
The present invention relates to a continuous compression-type dewatering apparatus for concentrated sludge, and more particularly to a compression-type dewatering apparatus for sludge that is difficult to filter, such as sewage sludge.
BACKGROUND ART
A filter press, a belt press, and a screw press (refer to Japanese Patent Application Publication No. 44-2929 and Japanese Unexamined Patent Application Publication No. 6-695, for example) are known types of pressurized dewatering apparatuses for dewatering difficult-to-filter sludge, such as sewage sludge.
With a filter press, however, there is a tendency for clogging to occur in the filter cloth used as a filter material, and it is difficult to renew the filter cloth by cleaning.
With a belt press, in order to sustain the functions of the filter cloth used as a filter material, it is necessary to continuously clean the filter cloth as dewatering is performed. For this reason, a large amount of cleaning water is consumed. Additionally, because sludge is only pressurized at the outer peripheral surfaces of a large number of pressure rolls arrange in a line, a large amount of installation space is required, and the filtering efficiency is low.
With a screw press, because the filtering surface is divided on the inner surface of a cylindrical metal filter material, a large amount of installation space is required, and the filtering efficiency is low.
DISCLOSURE OF THE INVENTION
In consideration of the above-described problems occuring in the past, it is an object of the present invention to provide a continuous compression-type denaturing apparatus having simple construction, small size, and a small installation space, and which has a high filtering efficiency, and operates at a low speed, so as to require only a small drive source.
To achieve the above-noted object, a first aspect of the present invention has a filter chamber (
3
), a drive shaft (
17
), vanes (
15
), and a supply path (
50
). The filter chamber (
3
) is divided into an annular plate (
2
) and two side plates (
1
,
1
). The drive shaft (
17
) passes through the center axis of the annular plate (
2
) and through the inside of the filter chamber (
3
), and is freely rotatable with respect to the filter chamber (
3
). The vanes (
15
) are disposed within the filter chamber (
3
), are fixed with respect to the drive shaft (
17
), extend from the drive shaft (
17
) toward the annular plate (
2
), and rotate in concert with the drive shaft (
17
). The supply path (
50
) passes through the inside of the drive shaft (
17
) and supplies raw fluid to the filter chamber (
3
). The vanes (
15
) have two side edges (
15
a
,
15
a
) that face the side plates (
1
,
1
) and an end edge (
15
b
) that faces the annular plate (
2
).
At least one of the side plates (
1
,
1
) includes a filter element (
4
) for separating the raw fluid into a liquid and a cake. The annular plate (
2
) includes an ejection port (
7
) for the cake.
By the action of the inflow pressure of the raw fluid from the supply path (
18
) to within the filter chamber (
3
) and the rotation of the vane (
15
), the filtered fluid flows out f rom the filter element (
4
) to the outside of the filter chamber (
3
), a cake that remains inside the filter chamber (
3
) being pushed to the outside of the filter chamber (
3
) from the ejection port (
7
).
In the above-noted configuration, the raw fluid flows into the center part of the filter chamber (
3
) from the supply path (
50
). After having flowed into the filter chamber (
3
) the raw fluid receives the flow pressure thereof and moves toward the side plate (
1
), and is filtered by the filter element (
4
). The filtered fluid passes through the filter element (
4
) and is ejected from the filter chamber (
3
), the cake remaining on the filter element (
4
). The remaining thin film of cake is scraped by side edge (
15
b
) of the rotating vanes (
15
), and is sent toward the outer periphery by the vanes (
15
). When the cake moves, a rotational friction force develops between the cake and the vanes (
15
), so that sliding resistance is generated between the cake and the side plate (
1
). For this reason, the cake is further filtered as it moves, so that the water content is lowest in the region of the annular plate (
2
). The cake with low water content is ejected via the ejection port (
7
).
The filter element (
4
) can be provided on each of the side plates (
1
), and can be provided over substantially the entire area of the side plate (
1
). By doing this, the filtering surface area with respect to the raw fluid is increased, thereby further increasing the filtering efficiency.
The annular plate (
2
) can include a second filter element (
9
) for separating the raw fluid into a liquid and a cake. By doing this, the filtering surface area with respect to the raw fluid is increased, thereby further increasing the filtering efficiency. The cake on the filter element (
9
) is pressured by the end edge (
15
b
) of the vane (
15
) and further dewatered, so that a cake with a further decreased water content is ejected from the ejection port (
7
).
The filter element (
4
) can be a substantially donut-shaped screen (
4
) with a large number of fine holes. The second filter element (
9
) can be a screen (
9
) with a large number of fine holes.
The side plate (
1
) can have a screen (
4
), an annular outer frame (
5
) fixed to the outer peripheral edge of the screen (
4
), an annular inner frame (
6
) fixed to the inner peripheral edge of the screen (
4
), and a rib (
5
a
) that links the outer frame (
5
) and the inner frame (
6
). By doing this, mounting of the screen (
4
) to the side plate (
1
) is facilitated, and the strength of the screen (
4
) is increased.
The supply path (
50
) can have a main supply path (
18
) within the drive shaft (
17
), a supply port (
19
) formed in the drive shaft (
17
) that opens toward the main supply path (
18
), and a linking path (
11
) adjacent to the drive shaft (
17
) on the side of the vane (
15
) and linking the supply port (
19
) and the filter chamber (
3
).
In the above-noted configuration, the raw fluid flows from the main supply path (
18
) through the supply port (
19
) and the linking path (
11
) into the filter chamber (
3
) from the side of the vane (
15
). The position of the supply port (
19
) is not particularly restricted, as long as it is on the side of the vane (
15
). In contrast, in the case in which the raw fluid is directly supplied from the main supply path (
18
) into the filter chamber (
3
), it is necessary that a port for supplying be formed in the part of the drive shaft (
17
) facing the filter chamber (
3
). Therefore, in order that the vane (
15
) be securely fixed by the drive shaft (
17
), there is the possibility of an increase in the material thickness of the drive shaft (
17
). When the material thickness of the drive shaft (
17
) increases, this can bring with it an increase in the weight and size of the apparatus.
With regard to this point, according to the above-noted configuration it is possible to form the supply port (
19
) at a location that does not present a problem with regard to strength, thereby limiting the increase in weight and size of the apparatus.
The vanes (
15
,
63
,
65
,
67
) can have operative surfaces that are forward in the rotational direction of the drive shaft (
17
), and the linear shape of the operative surface on a cross-section perpendicular to the drive shaft (
17
) can be substantially the same, and not dependent upon the location on the cross-section in the axial direction of the drive shaft (
17
).
The operative surface (
52
) on the cross-section perpendicular to the drive shaft (
17
) can be represented by a line along a reference straight line (
68
) passing through the center of the drive shaft (
17
).
The operative surface (
52
) on the cross-section perpendicular to the drive shaft (
17
) can be represented as a line along reference curved lines (
54
,
64
) extending from the drive shaft (
17
), and a tangent line (
56
) at an arbitr

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