JPH0512963B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a filtration method for removing solids from a liquid as a pretreatment of various waste liquids (for example, industrial waste liquids from paper manufacturing, livestock farming, etc.) and a filtration method thereof. Regarding equipment.

BACKGROUND TECHNOLOGY In general, industrial waste liquid, which is an industrial by-product and causes pollution, causes environmental pollution if dumped as it is, so it is required to remove harmful substances and the like before dumping it. However, in filtration devices that use wire mesh or filter cloth, the biggest problem that impedes filtration is clogging of the filter body.
The criteria for determining superiority or inferiority is how quickly and at low cost it can be repaired in the event of clogging. For this reason, there are filters that are cartridge-type so that they can be replaced quickly, and filters that blow pressurized water or air from the back of the filter to create a backflow, but all of these can cause clogging. This is a countermeasure or method for when something happens, and is not intended to prevent or prevent clogging, so the operation of the filtration device must be temporarily suspended.

Problems to be Solved by the Invention According to the conventional technology, it is necessary to temporarily stop the operation of the device to resolve the clogging of the filter, which reduces filtration efficiency and requires replacement and cleaning of the filter. Problems such as being complicated and troublesome arise. In addition, until the filter becomes clogged and must be replaced or cleaned, the filtration efficiency gradually decreases due to clogging, so a filter that is always in a fresh state will keep the waste fluid away. The fundamental drawback is that it is not filtered. Therefore, it has not been possible with conventional filtration devices to constantly operate the filtration device with high efficiency using a filter body that is always in a new state.

The present invention does not deal with problems that occur after the filter has become clogged, but by preventing and preventing clogging, the present invention maintains the filter in a new condition without interrupting the operation of the device, and continues filtration. The purpose is to make it possible to do it efficiently.

Means for Solving the Problems The present invention provides the following features: While rotating the filter body at an angle,
To configure and embody a filtration method in which wastewater is supplied to the lower half of the filtration system and is suctioned and collected by negative pressure, while the residue is blown off by pressurization to the upper half of the sewage tank and collected by suction. As a device, the frame is fixed at an angle, a pressurized chamber is formed in the upper half of the frame, a negative pressure chamber is formed in the lower half, and the rotation center is set at the axial center of the frame. A filtration device was constructed by mounting a filter body rotatably supported on the shaft, and a suction hood suspended above the upper half of the filter body. The above-mentioned filter body consists of a bottomed cylindrical body equipped with a top plate, a large number of through holes are bored in the top plate, and a plurality of radial partition plates are provided between the top plate and the bottom plate. The frame is divided into 2 gas and liquid chambers, and a through hole is formed in the bottom plate of each gas and liquid chamber. A pressurized chamber and a negative pressure chamber are formed separately in the lower half, and the lid is divided into an upper half and a lower half that match the through holes bored in the bottom plate of the filter body. A long arc-shaped hole is bored. Then, a filter cloth is stretched on the top surface of the top plate,
Further, a fastener for tensioning and fixing the filter cloth is provided on the top plate.

Effects According to the present invention having the above configuration, it is composed of a negative pressure chamber using a vacuum pump and a positive pressure chamber using a pressurizing blower, with the negative pressure chamber placed below and the positive pressure chamber placed above. A filter body made of a filter cloth stretched over a gas-liquid chamber having holes for both a negative pressure chamber and a positive pressure chamber is rotated on the frame, so that the gas-liquid chamber is placed above the negative pressure chamber. , it sucks out the waste water and leaves a residue on the filter cloth, and
When it is above the positive pressure chamber, the residue on the filter cloth is suspended by back injection of pressurized air, and the residue is collected by suction. In other words, the lower half of the slanted filter body is constantly filtrating, and the upper half is always collecting residue on the filter cloth and cleaning the filter to renew it. To improve filtration performance by preventing clogging of a filter body and keeping a filter body always free from clogging, and to enable continuous and efficient filtration work without the trouble of interrupting filtration work and replacing the filter body.

Summary of the Invention The outline of the configuration of the present invention will be briefly explained based on FIG. A frame 1 is fixed to the body 1, and has a negative pressure chamber 4 at the lower part of the lower side of the inclined filter body 21 and a pressurizing chamber 5 at the upper side, and furthermore, the filter body A suction hood 43 is suspended above 21. A gas-liquid separator 49 and a suction blower 50 are connected to the suction hood 43, a pressurizing blower 51 is connected to the pressurizing chamber 5, and a vacuum pump 52 and a drain pump 53 are connected to the negative pressure chamber 4 through pipe bodies. Connected. Further, sewage or the like is supplied onto the filter body 21 via the pump 54 and the water supply pipe 42 . 37 indicates a filter cloth.

Embodiment An embodiment of the present invention will be described below based on the drawings.

As shown in FIG. 2, a boss part 2 is provided at the axial center of a frame 1 made of a cylindrical body with a bottom, and a partition plate 3 is provided in the diametrical direction around this boss part 2. is divided into a negative pressure chamber 4 and a pressurized chamber 5. An intake pipe 6 and a drain pipe 7 are connected to the negative pressure chamber 4, and an air supply pipe 8 is connected to the pressurized chamber 5 so as to communicate with each other. The boss portion 2 is integrally formed with a lid body 9 that covers the upper surface of the frame 1, and the lid body 9 has an arcuate long hole 1 at its periphery that is divided into the negative pressure chamber 4 and the pressurized chamber 5 side.
0 and 11 have been established respectively. In addition, the shaft 12 is fitted with a thrust bearing 13 in the shaft hole of the boss portion 2.
The thrust bearing 13 is rotatably inserted through an oil-less bearing 14 and an adjusting fitting 15 for adjusting the axial movement length of the shaft 12 is engaged with the boss portion 2 . The adjustment fitting 15 is fixed with an adjuster nut 16. The shaft 12 is connected to an appropriate rotational drive source via a keyway 17. In addition, 18 is a grease supply port, 19 is a pressurizing chamber 5,
Reference numerals 20 denote drain holes of the boss portion 2, respectively.

A filter body 21 is connected to the upper end of the shaft 12. This filter body 21 is a circular cylinder with a bottom, which is substantially the same as the lid body 9, and as shown in FIG. The air-liquid chambers 25 are formed at intervals, and a through-hole 26 is formed in the peripheral edge of the bottom plate 22 of the air-liquid chamber 25, and a large number of through-holes 27 are formed in the top plate 23. This through hole 26 is arranged so as to match the arcuate elongated holes 10 and 11 formed in the lid body 9, and the through hole 26 and the arcuate elongated holes 10 and 11 are aligned with each other.
A gasket 28 shown in FIG. 4 is interposed between the two. The gasket 28 has an arcuate long hole 1 in the lid 9.
Arc-shaped elongated holes 29 and 30 that match 0 and 11 are opened. Numerals 31 and 31 are screw holes for fixing the gasket 28 to the lid 9. An outer cylindrical ring 33 is fixedly attached to the lid 9 through a bearing 32 on the outer periphery of the filter body 21, and a cylindrical housing 34 is connected to the outer cylindrical ring 33. on the other hand,
The filter body 21 has a flange portion 35 at its peripheral edge, and a filter cloth 37 is attached to cover the upper surface of the top plate 23 from the flange portion 35 to a central boss portion 36 . The periphery and center of the filter cloth 37 are provided with circumferential grooves 38 formed in the flange portion 35 and the boss portion 36,
39 and a fastener 4 such as a tension ring that bites into them.
0 and a filter cloth presser 41 to press and fix the filter cloth. The filter cloth 37 has an appropriate mesh size depending on the object to be filtered, but conventionally it has about 80 meshes, but in this embodiment, it is possible to use a mesh of about 300 meshes to improve the filtration performance. Further, the filter cloth 37 may be firmly fixed to the top plate 23 using a band-shaped fastener (not shown) that is fixed to the top plate 23 at the upper part of the partition plate 24 shown in FIG.

Above the filter body 21 is a negative pressure chamber 4 of the frame 1.
A suction hood 43 is suspended from the water supply pipe 42 and the pressurizing chamber 5 side, and a suction pipe 44 connected to the suction hood 43 penetrates through the housing 34 and is fixed thereto. Furthermore, a casing 45 is connected to the flange portion 35 of the filter body 21 . The housing 34 has a lid 47 with a ventilation hole 46 in the center.
is crowned and fixed. Note that 48 is an overflow pipe for the waste water scattered inside the housing 45.

Next, the operation of the above embodiment will be explained.

The shaft 12 is appropriately rotated to rotationally drive the filter body 21. Then, the negative pressure chamber 4 is connected to a vacuum pump 52.
The pressurizing chamber 5 is maintained at a negative pressure by the pressurizing blower 51. Therefore, when sewage is supplied into the lower half of the upper surface of the filter body 21 through the water supply pipe 42, the sewage passes through the filter cloth 37, and solid matter remains on the filter cloth, passes through the through hole 27, and enters the gas-liquid chamber. Filtered water enters 25.
The filtrate that has entered the gas-liquid chamber 25 is sucked into the negative pressure chamber 4 from the through hole 26 through the arcuate long hole 10, and is recovered from the negative pressure chamber 4 through the drain pipe 7. On the other hand, when the filter body 21 rotates and reaches the pressurizing chamber 5 side, the pressurized air in the pressurizing chamber 5 is ejected into the gas-liquid chamber 25 from the through hole 26 through the arcuate elongated hole 11. The residue remaining on the surface of the filter cloth 37 is blown off from the back side and floated, and the floating residue is sucked and collected by the suction hood 43. Therefore, while the upper half of the filter cloth 37 is constantly cleaned to prevent clogging, the lower half is always cleaned with a new filter cloth for efficient filtration.

Effects of the Invention According to the present invention described above, while rotating the filter body, one half of the filter body performs filtration while at the same time removing residue from the other half, thereby keeping the filter body always free from clogging. This improves filtration performance and enables efficient filtration work without the need to interrupt filtration work and replace the filter body. Therefore, in the past, only about 80 mesh filter cloth could be used due to the fast clogging cycle, but according to the present invention, 300 mesh filter cloth can be used.
Something as small as a mesh can be used, and the filtration performance can be improved several times.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of the configuration of the present invention, FIG. 2 is a longitudinal sectional view showing an embodiment of the present invention, FIG. 3 is a partially sectional plan view of a filter, and FIG. 4 is a partial plan view. DESCRIPTION OF SYMBOLS 1... Frame, 3... Partition plate, 4... Negative pressure chamber, 5... Pressure chamber, 7... Drain pipe, 8... Air supply pipe, 9... Lid body, 10,
DESCRIPTION OF SYMBOLS 11... Arc-shaped long hole, 12... Shaft, 21... Filter body, 22... Bottom plate, 23... Top plate, 24... Partition plate, 2
5... Gas-liquid chamber, 26, 27... Through hole, 28... Packing, 29, 30... Arc-shaped elongated hole, 34... Housing,
37... Filter cloth, 38, 39... Circumferential groove, 40... Fastener,
41...filter cloth holder, 42...water supply pipe, 43...suction hood, 45...casing.

Claims (1)

[Claims] 1. While rotating the filter at an angle, waste water is supplied to the lower half of the filter and sucked by negative pressure, while the residue is blown off and sucked by applying pressure to the upper half of the filter. A filtration method characterized by collecting. 2 fixing the frame at an angle, forming a pressurized chamber in the upper half of the frame and a negative pressure chamber in the lower half;
1. A filtration device comprising: a filter having a rotation center rotatably mounted on an axial center of a frame; and a suction hood suspended above an upper half of the filter. 3 The filter body consists of a bottomed cylindrical body equipped with a top plate,
The top plate has a large number of through holes, and the top plate and the bottom plate are divided into multiple air-liquid chambers by multiple partition plates in the radial direction, and each air-liquid chamber has a through-hole in the bottom plate. 3. The filtration device according to claim 2, further comprising a perforation. 4 The frame consists of a cylindrical body with a bottom and a lid, with a pressurized chamber in the upper half and a negative pressure chamber in the lower half. 3. The filtration device according to claim 2, wherein the filtration body is divided into halves and has arc-shaped elongated holes that match the through holes formed in the bottom plate of the filtration body. 5. The filtration device according to claim 3, wherein a filter cloth is stretched over the top surface of the top plate. 6. The filtration device according to claim 5, wherein fasteners are fastened to the periphery and the center of the upper surface of the top plate, respectively, for holding down the filter cloth and applying tension.