JPS5928654Y2 - Continuous sand "filtration" equipment - Google Patents

Description

[Detailed explanation of the invention] This invention injects raw water into the moving filter sand and performs an E-filter, and the contaminated filter sand is washed during the circulating movement and used again. This invention relates to so-called continuous sand filters, and more particularly, to improvements in the distributing device for washed filter sand.

In other words, this idea prevents filter sand contaminated with raw water from circulating deep into the filtration tank, resulting in a highly efficient continuous system that reduces clogging of the filter sand in the water collection area and the water collection plate. It is characterized by being able to be filtered.

Hereinafter, this invention will be explained in detail with reference to the drawings. First, the structure is such that the upper end of the pipe 3 for transferring filter sand is opened into the raw water chamber 2 formed in the upper part of the filtration tank 1. A cleaning device 4 for contaminated filter sand is provided in the opening, and
Below this washing device 4, an umbrella-shaped guide plate 5 is provided which can direct the washed filter sand toward the circumference of the filtration tank ff1i2, and a water collection screen 14 is further provided in the lower local part of the filtration tank 1. In the provided sand filter, a cylindrical weir plate 6 is provided below the guide plate 5 with a space therebetween and located inside the lower edge of the guide plate 5.

In the figure, reference numeral 7 is a raw water injection pipe, 8 is a filtered water increase pipe, 9 is an air supply pipe for lifting sand, and 10 is a float installed in the washing device 4, which corresponds to the amount of raw water. and rise and fall.

Reference numeral 11 indicates a discharge pipe for discharging wastewater after washing the filter sand.

Since the device according to this invention is configured as described above, the filter sand washed by the washing device 4 falls inside the washing tube 12 as shown in the figure, and then flows down along the guide plate 5. ,
It is distributed toward the periphery of the filtration tank 1.

Then, it falls through the gap between the filtration tank 1 and the weir plate 6, collapses toward the center of the filtration tank 1 at the lower edge of the weir plate 6, and forms an inverted conical filtration surface 13.

On the other hand, the raw water injected into the upper part of the filter tank 1 passes between the guide plate 5 and the filter sand deposited below its periphery, flows below the guide plate 5, and then forms the above-mentioned inverted conical shape. The p-liquid enters the filter sand through the filter surface 13 and is filtered, and the p-liquid is increased through the extrusion tube 8.

Then, the filter sand contaminated by filtering the raw water gradually moves to the bottom of the pipe 3 as the air blown from the air pipe 9 moves the sand at the bottom upward through the pipe 3. After rising and being washed by the washing device 4 to remove contaminants, it is flowed F again as described above.

As mentioned above, this invention enables continuous filtration by circulating filter sand, and in particular, by circulating this filter sand,
In forming the overlayer, in this invention, a cylindrical weir plate 6 with a smaller diameter than the guide plate 5 is provided below the guide plate 5 for the washed filter sand, so that the guide plate 5 also falls. The washed filter sand is blocked by this weir plate 6 and
P-tank 1
collapses toward the center, forming an inverted conical filtration surface.

That is, a layer of filter sand of a certain height is formed between the weir plate 6 and the E filter tank 1, and therefore the guide plate 5
When the raw water injected upward flows down, this filter sand layer acts as resistance, and the raw water passes through the gap between the guide plate 5 and the upper edge of the dam plate 6 and reaches the filter surface portion formed above.

In other words, while the filter sand flows down from the bottom of the P filter tank 1 to the front surface of the E liquid water collection screen 14 forming a layer of a certain thickness, the raw water flows down the filter surface 13 of the filter sand. Since the raw water passes through the water collection screen 14 in a substantially horizontal flow,
Contaminants contained in the raw water are captured in the shallow part of the filter sand in the p-direction 13 and are not carried into the deep part, and only uncontaminated filter sand is collected in front of the water collection screen 14. Water can be allowed to flow down, and the water collection screen 14
This prevents clogging and enables continuous operation for long periods of time.

In the past, in conventional devices of this type, a special baffle plate was installed to prevent contamination of the deep part of the E material by raw water, or raw water was injected directly toward the filter surface, but this idea By simply providing a shaped weir plate, the structure is simpler and cheaper to manufacture than conventional ones.

If a float 10 is provided in the washing device 4 as shown in the figure, the float 10 moves up and down in response to fluctuations in the amount of raw water and the vertical movement of the raw water head due to fluctuations in the raw water concentration, thereby controlling the amount of cleaning wastewater. It is even more effective as it can keep the water constant and prevent the filter sand from being washed away and the washed pollutants from flowing back into the raw water.

As described above in detail, the device according to the present invention overcomes the drawbacks of conventional products and can be manufactured at low cost, resulting in significant practical benefits.

[Brief explanation of drawings]

The drawing is a schematic longitudinal cross-sectional view of a continuous sand filtering device according to this invention. Explanation of symbols: 1...E filter tank, 2...Raw water chamber, 3...Pipe, 4...Washing device,
5... Information board, 6... Weir board.

Claims (1)

[Claims for Utility Model Registration] The upper end of a pipe 3 for transferring filter sand is opened in the raw water chamber 2 formed at the upper part of the filter tank 1, and a cleaning device 4 for contaminated filter sand is provided in the opening. At the same time, below the cleaning device 4, an umbrella-shaped guide plate 5 is provided that can distribute the cleaned filter sand toward the circumference of the filter tank 1, and further,
In a sand filter in which a water collection screen 14 is provided on the lower circumference of the filtration tank 1, an interval t is provided below the guide plate 5;
-C. A continuous sand filtration device characterized in that a cylindrical weir plate 6 is provided inside the lower edge of the guide plate 5.