JPH072020Y2 - Filtration device - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a filtering device used for filtering water such as pools, ponds, bathtubs and the like.

[0002]

2. Description of the Related Art As a filtration device for the above-mentioned application, a downflow rapid filtration device as shown in the schematic view of FIG. 3 has been developed. This is a body 1 made of a metal bottomed circular cylinder,
The lower water collecting pipe 2 drawn out from the side surface near the bottom of the body 1, the upper spherical metallic concave mirror 3 that closes the upper surface of the vertical body 2, and the upper mirror body 3 is inserted from the side surface of the upper mirror body 3 An upper water collecting pipe 4, which ejects water toward the concave spherical surface,
Filter bed layer 5 provided on the bottom surface of the body 2, and the filter bed layer 5
A filter layer 6 made of a granular filter material such as sand or ceramic is provided on the upper part of the filter.

In this filtering device, when the water to be treated is introduced from the upper water collecting pipe 4 and ejected toward the concave spherical surface of the upper mirror body 3, the water to be treated is sprinkled on the concave spherical surface to cause a downward laminar flow. It becomes a or a reflected flow b and permeates the filtration layer 6.
Therefore, the water to be treated is filtered and purified by the filtration layer 6 and then discharged from the lower water collecting pipe 2.

In such a filtering device, when the drainage from the lower water collecting pipe 2 and the water supply to the upper water collecting pipe 4 are applied to a filtration / water purification system in which a circulation pump is used, a suitable material for the filtering material of the filtering layer 6 By using, the linear velocity (LV) of the filtered water can be increased and the treatment efficiency is improved.

[0005]

However, when the linear velocity of the filtered water increases, the flow velocity of the laminar flow a downstream along the concave spherical surface of the upper mirror body 3 also increases, reaching the filtration layer 6 and swirling there. c occurs, and a phenomenon occurs in which the filtering material in the portion of the filtering layer 6 on the body 1 side is dug up and raised in the central portion (see FIG. 4).

As a result, a thin layer portion is formed in the filter layer 6 to lower the filtering performance, and the inner wall surface of the body 1 in which the vortex c occurs is damaged by the sandblasting action of the filter material.

An object of the present invention is to provide a filtering device which prevents the above-mentioned eddy current generation and solves the problems such as deterioration of filtering performance and damage to the wall surface in the body.

[0008]

To this end, the present invention is directed to a bottomed cylindrical body having a filtering layer provided therein, and an upper mirror body having a concave spherical shape installed so as to close the upper portion of the body. And a lower water collecting pipe that is attached to the side surface of the body to discharge filtered water, and an upper water collecting pipe that is attached to the side surface of the upper mirror body and ejects water to be treated to the inner wall surface of the mirror body. In the device, an inner wall surface of the body located above the upper surface of the filtration layer, an inner wall surface of the upper mirror body, or in a circumferential direction of a boundary surface between the body and the upper mirror body, a rectifying collar protruding inward is provided. Provided and configured.

[0009]

Embodiments of the present invention will be described below. FIG. 1 is a schematic view of a downflow type rapid filtration device of one embodiment. The same parts as those in FIGS. 3 and 4 described above are designated by the same reference numerals, and detailed description thereof will be omitted. In the present embodiment, a straightening guard 7 is attached to the inner wall surface at a position higher than the upper surface of the filtration layer 6 so as to project inward along the circumferential direction of the wall surface.

As a result, the laminar flow a flowing downward along the concave spherical surface of the upper mirror body 3 collides with the flow rectifying flange 7 to turn inward and become flow rectifying d in which the flow velocity is reduced. The rectified flow d merges with the reflected flow b and permeates the filtration layer 6, so that no eddy current is generated there. Therefore, problems such as digging up of the filtration layer 6 and damage to the inner wall of the body 1 do not occur.

Since the flow regulating flange 7 is located above the filtration layer 6, the flow regulating flange 7 will not be adversely affected during backwashing.

The mounting position of the rectifying collar 7 is shown in FIG.
2 can be attached to the upper part of the inner wall of the body 1 side, or, as shown in FIG. 2B, to the lower part of the inner wall of the upper mirror body 3. Reference numeral 1a is a mounting collar for the body 1, 3a is a mounting collar for the upper mirror body 3, 8 is a mounting bolt, and 9 is a nut.

Further, as shown in FIG. 2 (C), the rectifying flange 7 can be attached in a state of being sandwiched between the attaching flanges 1a and 3a. Further, as shown in FIG.
It is also possible to extend one of the mounting flanges 3a to the inside and use this as the rectifying flange 7. Further, although not shown, the other mounting flange 1a can be similarly extended to the inner side to form a rectifying flange.

From the viewpoint of preventing the generation of eddies, it is preferable that the width L of the rectifying brim 7 extending inward is larger, but if it is too large, the peripheral portion of the filtration layer 6 is not effectively used and the filtration performance is deteriorated. Set in consideration of this. Body 1
Although good results were obtained when the experiment was performed by setting the size to 4 to 5% with respect to the diameter of, it is not limited to this.

[0015]

As described above, according to the present invention, since the flow straightening collar is attached to the upper portion of the filtration layer, the laminar flow flowing along the inner wall of the upper mirror collides with the flow straightening collar and is guided to the inside, and the flow velocity is reduced. As a result, there is no risk of eddy currents, and the problems such as the lowering of the filtering action due to the excavation of the filtering material and the damage of the inner wall of the body due to sandblasting do not occur.

[Brief description of drawings]

FIG. 1 is a schematic view of a downflow rapid filtration device according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing an attachment aspect of a flow straightening collar of the filtration device.

FIG. 3 is a schematic view of a conventional downflow rapid filtration device.

FIG. 4 is a schematic diagram for explaining generation of a vortex flow in a conventional downflow rapid filtration device.

[Explanation of symbols]

1: body, 2: lower water collecting pipe, 3: upper mirror body, 4: upper water collecting pipe, 5: filter bed layer, 6: filter layer, 7: straightening collar, 8: bolt, 9: nut.

Claims (1)

[Scope of utility model registration request] 1. A cylindrical body having a bottom with a filter layer provided therein, an upper mirror body having a concave spherical shape attached to the upper part of the body so as to close the upper part, and a filter attached to a side surface of the body. Of a lower water collecting pipe for discharging the water of the above, and an upper water collecting pipe attached to the side surface of the upper mirror body for ejecting the water to be treated onto the inner wall surface of the mirror body, which is located above the upper surface of the filtration layer. A filtering device provided with a rectifying flange projecting inward in the circumferential direction of the inner wall surface of the body, the inner wall surface of the upper mirror body, or the boundary surface between the body and the upper mirror body.