KR-102962135-B1 - filtration device

KR102962135B1KR 102962135 B1KR102962135 B1KR 102962135B1KR-102962135-B1

Abstract

<Problem> In a filtration device equipped with a screw cleaning mechanism, lightweighting is achieved by increasing filtration efficiency and filter media cleaning efficiency. <Solution> A filtration device (1) that has a layer of filter material (14) inside a filtration tank (2) and filters raw water (16) by passing it through the layer of filter material (14) is equipped with a screw cleaning mechanism (6) that cleans the filter material (14) by rotating a screw (32). The screw cleaning mechanism (6) has a cylindrical outer tube (38) that is placed upright inside the filtration tank (2), a spiral-shaped screw (32) installed in the outer tube (38) in a direction in which the long axis extends in the longitudinal direction, and a screw driving means (26) that rotates the screw (32). The screw (32) is in the shape of a coil spring.

Inventors

사이토 야스히로

Assignees

니혼 겐료 가부시끼가이샤

Dates

Publication Date: 20260507
Application Date: 20190513
Priority Date: 20180514

Claims (3)

A filtration device having a filter layer composed of particles horizontally installed inside a filtration tank, and filtering supplied raw water by passing it through the filter layer, A filtration device comprising a screw cleaning mechanism for rubbing and washing a filter material by rotating the screw, the screw having a cylindrical outer tube arranged upright within the above-mentioned filtration tank, a spiral-shaped screw installed within the outer tube in a direction in which the major axis extends in the longitudinal direction of the outer tube, and a screw driving means for rotating the screw, wherein the screw cleaning mechanism comprises: a screw cleaning mechanism for rubbing and washing a filter material by rotating the screw. A filtration device characterized in that the shape of the screw, viewed from the direction along the axis of the screw, is in the form of a coil spring shape in which the lower part of the screw is freed, and there is no member such as an axis or reinforcing member present throughout the entire central hole of the screw, and screw blade members are present in an annular shape around the central hole, and a filter material layer made of the particles is present throughout the entire central hole.
In paragraph 1, A filtration device in which the rotation axis of the driving means is connected to a screw blade member constituting the screw at one end of the long axis direction of the screw.
In paragraph 1 or 2, A filtration device having a reinforcing member fixed to the inner circumferential edge of a screw blade member constituting the screw, extending along the screw's major axis direction over the entire length of the screw to connect separated parts of the screw blade member.

Description

filtration device The present invention relates to a filtration device, particularly in detail, having a layer of filter material inside a filtration bath and filtering supplied raw water by passing it through the layer of filter material, and in particular, to a filtration device equipped with a filter material cleaning mechanism by a screw inside the filtration bath. Conventionally, as shown in, for example, Patent Document 1 or 2, a filtration device is known that has a filter material layer inside a filtration tank and filters supplied raw water by passing it through the filter material layer. In addition, as a mechanism for cleaning the filter material in this type of filtration device, a cleaning mechanism using a spiral-shaped screw is known, as shown in, Patent Document 1 or 2. The cleaning mechanism using the screw described above basically comprises a cylindrical outer tube placed upright within a filtration tank, a spiral-shaped screw installed along a rotating shaft placed within the outer tube, and a screw driving means for rotating the screw, and scrubs and washes the filter material within the filtration tank while conveying it upward by the screw. By cleaning the filter media using the screw cleaning mechanism described above, the decrease in filtration efficiency caused by clogging of the filter media layer or dirtiness of the filter media due to attachments and aggregates can be resolved. FIG. 1 is a cross-sectional view showing a filtration device according to an embodiment of the present invention. Figure 2 is a plan view of a filtration tank equipped with the filtration device of Figure 1. Figure 3 is a plan view showing the filtration floor used in the filtration device of Figure 1. Figure 4 is a cross-sectional view showing the portion of the filter bottom cut along line 3b-3b of Figure 3. FIG. 5 is a partial plan view showing a screw equipped with the filtration device of FIG. 1. Hereinafter, embodiments of a filtration device according to the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 is a longitudinal cross-sectional view showing a filtration device according to one embodiment of the present invention, and FIG. 2 is a plan view showing a filtration tank of the filtration device of FIG. 1. Hereinafter, the description will be made with reference to FIG. 1 and FIG. 2. As shown in FIG. 1, the filtration device (1) of the present embodiment has a filtration tank (2) that is approximately cylindrical in shape with the top and bottom closed, a filtration floor (4) made of, for example, a steel plate and arranged horizontally in the lower inner part of the filtration tank (2), and a screw cleaning mechanism (hereinafter also referred to simply as a cleaning mechanism) (6) attached to the curved upper wall (20) of the filtration tank (2). The cleaning mechanism (6) includes a motor (26) described later, a reduction gear unit (27), a base (28), a cleaning tank (outer tube) (38), and a screw (32). In addition, the filtration device (1) also has a treated water outlet pipe (46) and a raw water injection pipe (56). Four support legs (8) (only one is shown in FIG. 1) are attached to the filtration tank (2), and the filtration tank (2) is installed on the bottom surface (10) by this. In addition, the structure supporting the filtration tank (2) is not limited to these support legs (8), and other support structures such as those formed by wrapping a strip-shaped plate may also be applied. The filtration floor (4) is installed by being separated upward from the curved bottom wall (9) of the filtration tank (2). In addition, the bottom wall (9) and the upper wall (20) described above are made of steel plates, for example. A plurality of strainers (12) are installed on the filtration floor (4) to collect filtered treated water (filtered water) and pass it downward. In addition, details regarding the filtration floor (4) and the strainers (12) will be described later. Also, the raw water injection pipe (56) of the tactical method is located to the right of the filtration tank (2) in FIG. 1, and the outlet of the raw water has an upward, approximately L-shaped form. This raw water injection pipe (56) can also be made in a different shape. A layer of filter material (14) for filtering raw water injected from the raw water injection pipe (56) is arranged on the filter base (4). For example, the filter base (4), made of a steel plate such as a stainless steel plate, is formed with a thickness of approximately 5 mm to 30 mm to support the weight of the filter material (14). Specifically, the filter material (14) has a diameter (particle size) of approximately 0.2 mm to 4.9 mm. This diameter depends on the quality of the raw water being treated, but generally, it is more preferable to have a diameter of approximately 0.6 to 1 mm. Multiple layers of filter material (14) may be stacked, and in this case, for example, sand with a diameter of approximately