Round filter tank

Abstract

The utility model belongs to the technical field of water treatment, and particularly relates to a circular filter tank which comprises a cylindrical tank body, an overflow weir is arranged in the tank body, a space enclosed by the overflow weir is a filter chamber, an air-water chamber is arranged below the filter chamber, and an annular drainage groove is formed by a gap between the tank body and the overflow weir; a filter material and a plurality of long-handle filter heads communicated with the air-water chamber are arranged in the filter chamber, a water inlet pipe is arranged above the filter chamber, and the end part of the water inlet pipe is positioned in the center of the filter chamber; a gas and water distribution channel is formed in the radial direction of the gas-water chamber, a plurality of vent holes and a plurality of water passing holes are formed in the two side walls of the gas and water distribution channel, a filtered water discharge pipe, a backwashing water pipe and a backwashing gas pipe are arranged in the gas-water chamber, and the outlet ends of the backwashing water pipe and the backwashing gas pipe are located in the center of the tank body; a backwashing drainage pipe is arranged at the bottom of the drainage tank; the problems that an existing filter tank is low in backwashing efficiency and poor in effect are solved.

Description

Technical Field

[0001] This utility model belongs to the field of water treatment technology, and specifically relates to a circular filter. Background Technology

[0002] Filtration is the process by which suspended particles in water are separated from the water by passing through a porous medium or filter screen. The suspended particles are trapped in the filter media or on the surface of the filter screen, thus clarifying the turbid water. During the filtration process, some organic matter, bacteria, viruses and other substances attached to the suspended particles in the water are also removed at the same time. Therefore, filtration is an important water treatment process for improving water quality.

[0003] Filter beds are a widely used water treatment structure for filtration processes. Chinese invention patent CN102423561A discloses a novel filter bed with a cylindrical body consisting of a circular outer shell and a bottom plate. A filter media interception device and a filter media support device are located between the outer shell and the internal circular inner cylinder. The filter media support device has pebbles on it, and filter media is placed on the pebbles. An air-water chamber is located between the filter media support device and the bottom plate. The circular inner cylinder is divided into a circular inlet chamber, a circular outlet chamber, and a circular air-water distribution chamber from top to bottom. Because the circular air-water distribution chamber and the circular outlet chamber are located at the center of the filter bed, backwash air and backwash water enter the lower part of the filter chamber through the air and water distribution holes in the air-water distribution chamber. This results in low inlet and air inlet efficiency. After backwashing, the backwash wastewater enters the circular outlet chamber through the square outlet holes in the filter chamber, resulting in low discharge efficiency. The backwash wastewater easily accumulates in the filter chamber, affecting the backwashing effect of the filter bed. Utility Model Content

[0004] The purpose of this invention is to provide a circular filter to solve the problems of low backwashing efficiency and poor effect of existing filter.

[0005] To solve the above-mentioned technical problems, this utility model provides the following technical solution:

[0006] A circular filter includes a cylindrical tank body with an overflow weir inside. The space enclosed by the overflow weir is a filtration chamber, and an air-water chamber is located below the filtration chamber. The gap between the tank body and the overflow weir forms an annular drainage trough. The filtration chamber contains filter media and several long-handled filter heads communicating with the air-water chamber. An inlet pipe is located above the filtration chamber, with its end located at the center of the filtration chamber. An air-water distribution channel is provided radially in the air-water chamber. Several air vents and several water passages are provided on both sides of the air-water distribution channel. The air-water chamber contains a filtered water discharge pipe, a backwash water pipe, and a backwash air pipe. The outlet ends of the backwash water pipe and the backwash air pipe are located at the center of the tank body. A backwash drain pipe is provided at the bottom of the drainage trough.

[0007] Furthermore, the pool body is provided with at least two overflow weirs, the height of which decreases from the inside to the outside. The two adjacent overflow weirs and the gap between the pool body and the overflow weirs form a multi-level annular drainage channel.

[0008] Furthermore, a rectifier cylinder is provided directly above the center of the filter chamber, the end of the water inlet pipe is located inside the rectifier cylinder and bends upward, and several water outlet holes are evenly distributed around the circumferential wall of the rectifier cylinder.

[0009] Furthermore, the top outer side of the overflow weir is chamfered, and the inner side of the top of the overflow weir is provided with a baffle.

[0010] Furthermore, the vent is located above the water passage, and the outlet end of the backwash air pipe is higher than the outlet end of the backwash water pipe.

[0011] Furthermore, the bottom of the pool is provided with multiple supporting beams, the upper end of the supporting beams is provided with a supporting layer, and the overflow weir is placed on the supporting layer.

[0012] Furthermore, the filter media includes an upper filter media and a lower filter media. A filter plate is provided under the lower filter media, one end of the long-handled filter head is located inside the filter plate, and the other end of the long-handled filter head penetrates the support layer and is located in the air-water chamber.

[0013] Furthermore, a support frame is provided inside the pool, and the rectifier cylinder is fixed on the support frame.

[0014] Compared with the prior art, the present invention has the following beneficial technical effects:

[0015] 1. This utility model places the air-water chamber and the air-water distribution channel directly below the filter chamber, and the air-water distribution channel is arranged radially along the filter chamber. During backwashing, the backwash water and backwash air spread from the air-water distribution channel to both sides of the air-water chamber through the air vents and water passages. Compared with the existing circular air-water distribution cavity set in the center of the filter, the air-water distribution channel of this utility model has a larger volume, and the air vents and water passages are evenly distributed on both sides of the air-water distribution channel, so that the backwash water and backwash air can quickly and evenly fill the air-water chamber, resulting in high water and air intake efficiency.

[0016] 2. This utility model places the drainage trough outside the filter chamber, allowing backwash wastewater from the filter chamber to be discharged into the drainage trough in a timely manner. Compared with the existing circular drainage chamber located in the center of the filter tank, the annular drainage trough of this utility model has a larger volume, which can fully accommodate the backwash wastewater discharged from the filter chamber, avoiding the accumulation of backwash wastewater in the filter chamber and improving the backwashing effect of the filter chamber. Furthermore, when the diameter of the tank is large, by setting up multiple water outlet troughs in the tank, it can be ensured that the slope of the water outlet troughs meets the relevant specifications.

[0017] 3. By setting up a rectifier cylinder, the water in the inlet pipe can radiate from the center of the filter chamber to the surrounding area, while providing a sweeping water flow for backwashing surface cleaning; and the end of the inlet pipe located inside the rectifier cylinder is bent upward, which can consume part of the potential energy of the inlet water, reduce the impact of the inlet water on the bottom of the rectifier cylinder, and extend the service life of the rectifier cylinder. Attached Figure Description

[0018] Figure 1 This is a top view of Embodiment 1 of the present utility model;

[0019] Figure 2 This is a cross-sectional view of Embodiment 1 of the present utility model;

[0020] Figure 3 This is a top view of Embodiment 2 of the present invention. Detailed Implementation

[0021] The following detailed description illustrates the specific implementation method:

[0022] The reference numerals in the accompanying drawings include:

[0023] Pool body 1, supporting beam 11, supporting layer 12, overflow weir 13, baffle 131, support 14;

[0024] Filter chamber 2, upper filter media 21, lower filter media 22, filter plate 23, long-handled filter head 24;

[0025] Air-water chamber 3, air and water distribution channel 31, air vent 32, water passage 33, filtered water discharge pipe 34, backwash water pipe 35, backwash air pipe 36;

[0026] Drainage trough 4, backwash drain pipe 41;

[0027] 5. Rectifier cylinder, 51.

[0028] Example 1

[0029] like Figure 1-2 As shown, a circular filter includes a cylindrical tank body 1. Multiple support beams 11 are provided at the bottom of the tank body 1, and a support layer 12 is provided at the upper end of the support beams 11. An overflow weir 13 is provided on the support layer 12. The space enclosed by the overflow weir 13 is a filter chamber 2. A chamfer is provided on the outer side of the top of the overflow weir 13, and a baffle 131 is fixed to the inner side of the top of the overflow weir 13 by screws. By providing a chamfer and baffle 131 on the overflow weir 13, a triangular overflow weir 13 structure is formed at the top of the filter chamber 2, preventing overload of the filter chamber 2, ensuring that water flows out of the filter chamber 2 in a controlled manner, helping to maintain an appropriate liquid level in the filter chamber 2, optimizing the sedimentation process, and maintaining the filtration effect and efficiency.

[0030] like Figure 2As shown, the filter chamber 2 is provided with an upper filter media 21, a lower filter media 22, and a filter plate 23 from top to bottom. Several long-handled filter heads 24 are provided on the filter plate 23. An air-water chamber 3 is located below the filter chamber 2. The lower end of the long-handled filter head 24 penetrates the support layer 12 and communicates with the air-water chamber 3. Figure 1-2 As shown, the air-water chamber 3 is provided with an air-water distribution channel 31 in the radial direction. Several air holes 32 and several water holes 33 are opened on both sides of the air-water distribution channel 31. The air holes 32 and water holes 33 are evenly distributed on the side walls of the air-water distribution channel 31. The position of the air holes 32 is higher than that of the water holes 33. The air-water chamber 3 is also provided with a filtered water discharge pipe 34, a backwash water pipe 35 and a backwash air pipe 36. The outlet ends of the backwash water pipe 35 and the backwash air pipe 36 are located at the center of the pool body 1, and the outlet end of the backwash air pipe 36 is higher than the outlet end of the backwash water pipe 35.

[0031] The air-water chamber 3 and the air-water distribution channel 31 are located directly below the filter chamber 2, and the air-water distribution channel 31 is arranged radially along the filter chamber 2. During backwashing, since the outlet ends of the vent 32 and the backwash air pipe 36 are located at a higher position on the side wall of the air-water distribution channel 31, and the outlet ends of the water passage 33 and the backwash water pipe 35 are located at a lower position on the side wall of the air-water distribution channel 31, and the outlet ends of the backwash water pipe 35 and the backwash air pipe 36 are located at the center of the tank body 1, the backwash water and backwash air can spread evenly from the air-water distribution channel 31 to both sides of the air-water chamber 3 through the vent 32 and the water passage 33. The air-water distribution channel 31 has a large volume, and the vent 32 and the water passage 33 are evenly distributed on both sides of the air-water distribution channel 31, so that the backwash water and backwash air can quickly and evenly fill the air-water chamber 3, resulting in high water and air intake efficiency and improving the backwashing efficiency of the filter chamber 2.

[0032] like Figure 1-2 As shown, the gap between the pool body 1 and the overflow weir 13 forms an annular drainage trough 4, and the bottom of the drainage trough 4 is provided with a backwash drain pipe 41. The drainage trough 4 is located on the outer edge of the filter chamber 2, so that the backwash wastewater passing through the filter chamber 2 can be discharged from the filter chamber 2 in time and enter the drainage trough 4. Moreover, the annular drainage trough 4 has a large volume, which can fully accommodate the backwash wastewater discharged from the filter chamber 2, avoid the accumulation of backwash wastewater in the filter chamber 2, and improve the backwashing effect of the filter chamber 2.

[0033] like Figure 1-2As shown, a support 14 is fixed at the center of the pool 1, and a rectifier cylinder 5 is fixed on the support 14. The rectifier cylinder 5 is located directly above the center of the filter chamber 2. Several water outlet holes are evenly distributed around the cylinder wall of the rectifier cylinder 5. An inlet pipe 51 is connected inside the rectifier cylinder 5. The end of the inlet pipe 51 inside the rectifier cylinder 5 is bent upward. By setting the rectifier cylinder 5, the water in the inlet pipe 51 can radiate from the center of the filter chamber 2 to the surrounding area, while providing a cleaning water flow for backwashing surface cleaning. Furthermore, the upward bend of the end of the inlet pipe 51 inside the rectifier cylinder 5 can consume part of the potential energy of the water, reduce the impact of the water on the bottom of the rectifier cylinder 5, and extend the service life of the rectifier cylinder 5.

[0034] To ensure the normal filtration and backwashing operation of the filter tank, valves are installed on the inlet pipe 51, the filtered water discharge pipe 34, the backwash water pipe 35, the backwash air pipe 36, and the backwash drain pipe 41.

[0035] The specific implementation is as follows:

[0036] During normal filtration, open the valve of the inlet pipe 51 and wait for the filtered water to enter the rectifier cylinder 5 from the inlet pipe 51. Then, it enters the filter chamber 2 through the water outlet on the wall of the rectifier cylinder 5, passes through the upper filter media 21 and the lower filter media 22, and enters the air-water chamber 3 through the long-handled filter head 24. Finally, it is discharged through the filtered water discharge pipe 34.

[0037] During backwashing (taking simultaneous air and water backwashing as an example), close the inlet pipe 51 valve. When the water level in the filter chamber 2 drops to a certain position, close the filtered water discharge pipe 34 valve and open the valves of the backwash water pipe 35 and the backwash air pipe 36. The backwash water and backwash air enter the air and water distribution channel 31 from the backwash water pipe 35 and the backwash air pipe 36 respectively. They are distributed to the entire air and water chamber 3 through the air vents 32 and water passages 33 on the side wall of the air and water distribution channel 31. Finally, they pass through the lower filter media 22 and the upper filter media 21 in sequence through the long-handled filter head 24 to backwash and regenerate the upper filter media 21 and the lower filter media 22. The backwash wastewater in the filter chamber 2 overflows from the baffle 131 at the top of the overflow weir 13 and enters the drainage trough 4. Open the valve of the backwash drain pipe 41 and discharge the backwash wastewater through the backwash drain pipe 41.

[0038] Example 2

[0039] like Figure 3 As shown, the difference between this embodiment and Embodiment 1 is that: the pool body 1 is provided with at least two overflow weirs 13. This embodiment is described with two overflow weirs 13. The height of each overflow weir 13 decreases from the inside to the outside. The gap between two adjacent overflow weirs 13 and the gap between the pool body 1 and the overflow weirs 13 constitutes a two-stage annular drainage channel 4. When the diameter of the pool body 1 is large, by setting multiple water outlet channels in the pool body 1, it can be ensured that the slope of the water outlet channels meets the relevant specifications.

[0040] The above descriptions are merely embodiments of this utility model. Commonly known technical solutions and / or characteristics are not described in detail here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the technical solution of this utility model. These modifications and improvements should also be considered within the scope of protection of this utility model, and will not affect the effectiveness of the implementation of this utility model or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A circular filter basin comprising a cylindrical basin body (1), characterised in that: The pool body (1) is provided with an overflow weir (13), and a space surrounded by the overflow weir (13) is a filter chamber (2). The lower part of the filter chamber (2) is provided with a gas-water chamber (3), and a gap between the pool body (1) and the overflow weir (13) forms an annular drainage groove (4). The filter chamber (2) is provided with filter material and a plurality of long-handle filter heads (24) in communication with the gas-water chamber (3). The upper part of the filter chamber (2) is provided with a water inlet pipe (51), and the end of the water inlet pipe (51) is located in the center of the filter chamber (2). The gas-water chamber (3) is provided with a gas-water distribution channel (31) in the radial direction. The two side walls of the gas-water distribution channel (31) are each provided with a plurality of air holes (32) and a plurality of water holes (33). The gas-water chamber (3) is provided with a post-filter water discharge pipe (34), a backwashing water pipe (35) and a backwashing gas pipe (36). The outlet ends of the backwashing water pipe (35) and the backwashing gas pipe (36) are located in the center of the pool body (1). The bottom of the drainage groove (4) is provided with a backwashing drainage pipe (41).

2. A circular filter tank according to claim 1, characterized in that: The pool body (1) is provided with at least two circles of overflow weirs (13), and the heights of the overflow weirs (13) decrease from inside to outside. The adjacent two circles of overflow weirs (13) and the gap between the pool body (1) and the overflow weirs (13) form a multi-stage annular drainage groove (4).

3. A circular filter tank according to any of claims 1-2, characterized in that: The center of the filter chamber (2) is provided with a flow straightening cylinder (5), and the end of the water inlet pipe (51) is located in the flow straightening cylinder (5) and is bent upwards. The cylinder wall of the flow straightening cylinder (5) is circumferentially provided with a plurality of water outlet holes.

4. A circular filter tank according to any one of claims 1-2, characterized in that: The top of the overflow weir (13) is provided with a chamfer on the outside, and the inside of the top of the overflow weir (13) is provided with a circle of baffles (131).

5. A circular filter tank according to any one of claims 1-2, characterized in that: The air holes (32) are located above the water holes (33), and the outlet end of the backwashing gas pipe (36) is higher than the outlet end of the backwashing water pipe (35).

6. A circular filter tank according to any one of claims 1-2, characterized in that: The bottom of the pool body (1) is provided with a plurality of supporting beams (11), and the upper end of each supporting beam (11) is provided with a supporting layer (12). The overflow weir (13) is placed on the supporting layer (12).

7. A circular filter tank according to claim 6, characterized in that: The filter material includes upper filter material (21) and lower filter material (22), and the lower filter material (22) is provided with a filter plate (23). One end of the long-handle filter head (24) is located in the filter plate (23), and the other end of the long-handle filter head (24) penetrates through the supporting layer (12) and is located in the gas-water chamber (3).

8. A circular filter tank according to claim 3, characterized in that: The pool body (1) is provided with a support (14), and the flow straightening cylinder (5) is fixed on the support (14).

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