JPS648564B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a filter device for filtering and purifying general industrial water, wastewater, and the like.

[Prior art]

(Problems to be Solved) Many such devices have been known in the past. If the material filled in the overtank of the filtration system becomes contaminated and becomes clogged, the overcapacity will decrease, so either replace the contaminated material with new material, or use the commonly known method at water treatment plants, etc. Or, as disclosed in Japanese Unexamined Patent Publication No. 51-79051, Japanese Utility Model Publication No. 55-4016, etc., the overcapacity can be recovered by various methods of backwashing to remove the contaminants that caused the clogging. It's on.

In the former case, a considerable number of man-hours are required to replace the overfill, a certain amount of equipment is required depending on the frequency of replacement, and the overfill process cannot be carried out continuously.

In the latter case, a troublesome backwashing operation is required, and the process has to be stopped intermittently, and the purified water used for backwashing has to be reused.

In addition, as an improved filtering device,
41708, and a method has been proposed in which contaminated material is sent to a separation tank and recovered after cleaning. There was a problem that I had to do it.

[Means for solving problems]

The present invention has been made to solve the above-mentioned problems.The present invention has been made in order to solve the above-mentioned problems. The header is equipped with a rising pipe that opens at the bottom of the tank and rises up, a descending pipe that discharges the pollutants separated by the siphon phenomenon, and a stop valve that forms a siphon at the time of startup. A negative pressure pipe is connected to the ejector through the pipe, and an annular distribution chamber is installed to optimize the inflow direction of the raw water, so that the overcapacity of the material can be continuously recovered using only the head energy of the inflowing raw water. The present invention provides a continuous filtration device characterized by the following features.

〔Example〕

(Operation) An embodiment of the present invention will be described in detail with reference to the drawings. In the figure, 1 is a main body of the continuous filtration device that is formed into a rectangular or cylindrical shape and is sealed at the top and bottom, and 2 is a reverse funnel-shaped central part with an opening at the top, the same structure as the main body 1, and a small diameter body at the bottom. Next, there is an overtank main body formed in an inverted cone shape, 2a is a material layer filled with material a made of sand, etc., 2b is a reservoir for filtered purified water,
2c is a clean water overflow hole, 2d is a material for blowing wood, 3
is a raw water flow chamber, 3d is a raw water flow hole, 3b, 3c are raw water outflow holes, 4 is a raw water inflow chamber, 5 is a raw water introduction pipe,
6 is a purified water outflow chamber, 7 is a purified water outlet pipe that is partially open to the atmosphere, 8 is a rising pipe, 8a is a bottom opening, 9 is a header that separates the cleaned material and pollutants, 10 is a rotary valve, and 11 is a Electric motor, 12 is a material recovery pipe, 13 is a polluted water down pipe, 14 is a negative pressure pipe, 1
5 is an ejector for generating negative pressure, 16 is a pressurized water supply pipe, 16a, 16b are pressurized water branch pipes, 17 is a polluted water tank, 17a is an overflow weir, 14a, 16c, 16
d is a stop valve.

The overtank 2 is filled with the material a up to the inverted funnel-shaped slope above it, forming a material layer 2a, and the raw water flow chamber 3 contains a sphere made of a synthetic resin material with a slightly large diameter. 3d is filled to ensure even diversion.

Here, the lower end opening 8a of the riser pipe 8 is located close to the inverted conical bottom of the overflow tank 2, the lower end of the recovery pipe 12 is located lower than the overflow hole 2c by a predetermined water head, and the polluted water tank 17 is It is located relatively low so that a predetermined siphon flow velocity is formed due to the water head difference with the overflow hole 2c of the tank 2, and polluted water is stored to a depth level that seals the lower end of the downcomer pipe 13.

The operation of the continuous filtration device configured in this way will be explained.

First, to start filtration, open the valve 16d to supply pressurized water into the filtration tank 2, fill it to a level where it overflows from the overflow hole 2c, and then drain the recovery pipe 1.
2 so that the lower end is at a predetermined depth. at the same time,
Water is injected into the polluted water tank 17 as appropriate, and the overflow weir 17 is
The water is stored up to a point a and the lower end opening of the downcomer pipe 13 is sealed with water.

Next, when the stop valves 16c and 14a are opened to supply pressurized water to the ejector 15, the ejector 15 generates negative pressure by jetting the pressurized water, and the negative pressure is applied to the inside of the header 9 via the negative pressure pipe 14. Due to this negative pressure, the water that has filled up to the purified water reservoir 2b of the overtank 2 is sucked up into the header 9 through the recovery pipe 12 through a small gap in the rotary valve 10, and eventually flows inside the header 9.
Subsequently, the downcomer pipe 13 and negative pressure pipe 14 are filled, and a siphon is completed between the riser pipe 8 and the downcomer pipe 13 via the header 9.

When this siphon is completed, the stop valve 14a,
16c and 16d are closed and the raw water to be treated is sent from the raw water introduction pipe 5 to the raw water flow chamber 3 via the inflow chamber 4, and the filled spheres 3d flow into the plurality of outflow holes 3b and 3c provided on the side and top surfaces. The pressure is equalized, the flow is divided in a predetermined direction from the respective outflow holes 3b and 3c, flows through the overlayer 2a, and undergoes filtration.

The filtered purified water then overflows from the overflow hole 2c, passes through the outflow chamber 6, and is led out from the outflow pipe 7 which is open to the atmosphere.

On the other hand, the contaminated material a at the bottom of the overlayer 2a is
Due to the rising water flow of the riser pipe 8 due to the siphon phenomenon, it is sucked in along with the incoming raw water from the lower end opening 8a, and is lifted up and enters the header 9. During this lifting, the contaminated material a is washed by separating contaminants by friction with the turbulent rising water flow, collisions between the materials, collision with the inner wall of the rising pipe 8, etc. As the flow velocity decreases, the flow of purified water sinks downward, leaks through the rotary valve 10 and rises, and the purified water is deposited while being prevented from being recontaminated by polluted water, and is recovered by the rotation of the rotary valve 10 driven by the electric motor 11. It is returned to the upper surface of the superlayer 2a via the tube 12.

On the other hand, the polluted water containing pollutants is discharged to the polluted water tank 17 via the downcomer pipe 13 due to the siphon action.

At this time, the rising water flow and the descending water flow due to the siphon action are equal to the water head of the raw water introduction pipe 5, that is, the overlayer 2
Flow resistance head of a, overflow hole 2c and polluted water tank 17
The speed is determined by the head difference between the overflow weir 17a and the overflow weir 17a. By doing so as described above, the water head obtained can be constructed to be large, so that the specific gravity of the material a can be increased, and the overspeed can be increased.

Moreover, since the filtered purified water flows down by gravity from the overflow hole 2c, there is no problem such as floating of the material a in flowing raw water and deterioration of overperformance.

Furthermore, since the raw water flow chamber 3 is provided, the raw water flowing in is divided in each direction, the raw water flowing through the overlayer 2a is evenly distributed, and the material a rises without accumulating in corners etc. It sinks evenly and smoothly according to the suction into the pipe 8,
It is possible to maintain superior performance.

〔Effect of the invention〕

As described in detail above, according to the present invention, raw water to be treated can be continuously filtered, and materials contaminated during this continuous filtering can be removed from the lower part of the superlayer using the hydraulic head energy of the introduced raw water itself. Since the water is lifted up to the separation tank while being washed and returned to the upper surface of the overlayer, it is possible to save energy and eliminate loss of purified water.

In addition, by appropriately selecting the water head that performs the siphon action, it is possible to increase the specific gravity of the material and increase the overspeed to about five times that of conventional sieving devices.

In this way, it is possible to achieve the effects of energy saving, high overspeed, and high overperformance.

[Brief explanation of drawings]

The figure is a schematic diagram showing the configuration of a continuous filtration device. 1...Continuous filtration device main body, 2...Treasure tank, 2a
...superlayer, 2b...purified water reservoir, 2c...overflow hole, 2d...material blowing port, 3...raw water flow chamber,
4... Raw water inflow chamber, 5... Raw water inlet pipe, 6... Purified water outflow chamber, 7... Purified water outlet pipe, 8... Rising pipe, 9
... Header, 10 ... Rotary valve, 11 ...
Electric motor, 12... Recovery pipe, 13... Polluted water descending pipe, 14... Negative pressure pipe, 15... Ejector, 1
6... Pressurized water supply pipe, 17... Polluted water tank, 14
a, 16c, 16d...Stop valve.

Claims (1)

[Scope of Claims] 1 Inside the sealed main body of the filter device, the upper part is opened in the shape of an inverted funnel and an overflow hole is opened near the upper edge, and the lower part is formed in the shape of an inverted cone through a small diameter body. A header is placed on the upper part of the over-tank main body, and a header is placed on the upper part of the over-tank, and a header is placed on the upper part of the over-tank, and connects a material recovery pipe with a rotary valve in the middle downwardly. a riser pipe communicating with the
A continuous filtration device characterized in that a siphon is formed by connecting a descending pipe connected to a polluted water tank located below the main body of the filtration device. 2. An ejector that generates negative pressure with pressurized water to form the siphon at startup, a negative pressure pipe connecting the ejector and the header, and a filling pipe for filling water into the overtank are provided. A continuous filtration device according to claim 1, characterized in that: 3. The continuous filtration device according to claim 1, characterized in that an annular raw water flow chamber is provided so as to surround the small-diameter body of the lower part of the filtration tank.