JPH0442046B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a filtration device for sucking up a filtered liquid from a liquid mixed with solids and supplying gas into the liquid.

[Problem to be solved by the invention]

The object of the present invention is to provide a filtration device that can suck up liquid filtered in a septic tank, etc., supply gas such as air into the liquid, automatically eliminate clogging of the filter, and supply gas into the liquid in a cellular state. An object of the present invention is to provide a filtration device with improved filter clogging removal properties, filter durability, and filter replaceability.

[Means to solve the problem]

The filtration device of the present invention has a body portion 11 which has a cylindrical shape with a bottom, has a circularly opened top surface as a filter mounting surface, and has a filtrate suction port provided in its bottom portion;
The upper end surface of the body 11 and the frame 32 fastened to the upper end surface
a flexible filter 3 which is sandwiched between the flexible filter 3 and stretched to cover the upper end opening of the body 11; A porous face piece 6 for blowing gas has a perforated plate having a large number of small holes dispersedly provided on the upper surface and arranged parallel to the lower surface of the filter; It is composed of a gas supply device 5 that intermittently supplies high-pressure gas to the porous surface body 6 for blowing out gas.

〔Example〕

Next, the present invention will be explained based on an embodiment shown in the drawings.

The filtration device of the present invention is installed in a liquid tank A, and includes a body 11 having a vertical cylindrical shape and a bottom 12;
an edge 13 extending from 2 into a predetermined shape such as an oval shape;
A suction port 14 provided at the center of the bottom 12, a cylindrical portion 15 for connecting a suction pipe provided at the edge 13, and a cylindrical portion 15 for connecting the suction pipe provided on the lower surface of the edge 13 for connecting the suction port 14 and the cylindrical portion 15 for connecting the pipe. The main body 1 is provided with a liquid passage 16 and a liquid passage 16 .

A large number of legs 2 are fixed to the lower surface of the edge 13, and the periphery is fixed between the upper end surface 11A of the main body body 11 and an annular frame 32 tightened to the upper end surface 11A with screws 31. A filter 3 is stretched so as to cover the opening. A suction pipe 4 is connected to the suction pipe connecting tube 15 of the filtration tank, and is connected to a suction port of a liquid pump (not shown) disposed outside the liquid tank A. Reference numeral 5 denotes a gas supply device, which includes a porous surface body 6 for blowing out gas and an air supply pipe 7.

As shown in FIG. 3, the gas ejection porous surface body 6 has a disk shape with an outer diameter slightly smaller than the inner surface of the filter 3, and has a recess 62 formed in its upper surface and a communication port with the air supply pipe 7. It consists of a disk body 61 in which a large number of branched air holes 64 are provided, which extend upward from 63 and communicate with the recess 62, and a perforated plate 65 in which a large number of small holes 66 are provided.

The air supply pipe 7 passes through the body 11 of the filtration tank, the filtration suction port 14, the liquid path 16, and the suction pump 4, and is connected to an air pump, a gas tank, a factory air supply port, etc. ( (both not shown). As shown in FIG. 1, the perforated plate 65 of the gas ejection porous face member 6 is supported by a stay 67 fastened to the inner circumferential surface of the body 11 of the filter tank, and is disposed close to and parallel to the inner surface of the filter 3. has been done.

This filtration device uses a liquid pump to suck in the liquid filtered through the filter 3 in the liquid tank A. The liquid is sucked up from the suction pipe 4 through the gap B between the filter 3 and the upper surface of the porous face piece 6 for blowing out gas, and the gap C between the inner peripheral surface of the body 11 of the filtration tank and the outer periphery of the porous face piece 6 for blowing out gas. It will be done. As the liquid is sucked up, the filter becomes clogged with solids in the liquid tank A, and over time it becomes impossible to suck it up.
High-pressure gas is intermittently supplied from the porous surface body 6 for blowing gas through the air supply pipe 7 at appropriate intervals. The ejection pressure, ejection time, and size of the gaps B and C between the inner surface of the filter 3 and the gaps B and C are such that the gas spreads in the radial direction while excluding liquid from the gap B, and enters the body 11 through the gap C. The amount that passes through the filter 3 is set to be sufficiently larger than the amount. As a result, when high-pressure gas is ejected from the perforated plate 65, the filter is expanded as indicated by 3', and the solids that have been clogging are removed. Therefore, the liquid can be sucked up continuously, and the air is evenly ejected to the inner surface of the filter through the perforated plate 65, so that it hits the inner surface of the filter evenly and blows through the entire surface of the filter, preventing clogging of the filter. At the same time, it becomes fine bubbles in the filter and dissolves easily in the liquid.

The gas ejection porous face body may be equal to or larger than the filter surface as long as it can be arranged so that the filtration tank does not block the flow path of the liquid filtered through the filter. Note that it is preferable to use a pump that can handle gas suction, such as a pump with an automatic air removal device, since some of the ejected gas may be mixed in with the liquid pump for sucking the liquid.

〔Effect of the invention〕

As described above, in the filtration device of the present invention, a flexible filter is fastened to the circular opening on the upper surface of the body. In response to the impact caused by the blowing of high-pressure gas to remove clogging of the filter, the impact force is evenly distributed in the circular fastening part, resulting in excellent durability. Furthermore, since the filter is fastened to the top surface with screws, it is easy to replace the filter. Furthermore, since high-pressure gas is blown through a perforated plate with a size equivalent to the diameter of the filter, clogging on the entire surface of the filter can be reliably removed.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of the filtration device of the present invention, FIG. 2 is a plan view, and FIG. 3 is a plan view of a porous surface body for blowing out gas. In the figure, 1... Main body of the filter tank, 2... Legs, 3...
Filter, 5... Gas supply device, 6... Porous face piece for gas jetting.

Claims (1)

[Scope of Claims] 1. A body having a cylindrical shape with a bottom, a circularly opened top surface serving as a filter mounting surface, and a filtrate suction port provided at the bottom; an upper end surface of the body; and the upper end surface. a flexible filter that is sandwiched between a frame fastened to the frame and stretched to cover the upper end opening of the body; and a flexible filter that is installed in the body and has a disc shape with the same diameter as the filter; a porous facepiece for gas ejection having a perforated plate having a large number of small holes dispersedly provided on the upper surface and arranged parallel to the lower surface of the filter; A filtration device comprising a gas supply device that intermittently supplies high-pressure gas to a porous surface for ejection.