A water inlet device special for a shallow sand filter tank

Abstract

The utility model discloses a kind of water inlet device special for shallow sand filter, including box, outlet weir plate and water distribution pipe, regulating valve, lower outlet block;The box is U-shaped, which is connected with the pool wall of shallow sand filter, and the water inlet of inlet pipe is located in the box;The weir of outlet weir plate and water distribution channel position correspond and are trapezoidal, and the three edges of the outlet weir plate are connected with the three edges of the outside of the box respectively;The lower end of the box is communicated with lower outlet block by the water distribution pipe of regulating valve being provided with;Lower outlet block is located in water distribution channel, and the water outlet of lower outlet block and water distribution channel bottom surface are parallel.The utility model is through the water distribution pipe of adjustable height outlet weir plate and adjustable bottom with horizontal water outlet lower outlet block, completely satisfies the water requirement of various water quantity of shallow sand filter.

Description

Technical Field

[0001] This utility model belongs to the field of wastewater treatment technology, and in particular relates to a water inlet device specifically for shallow sand filters. Background Technology

[0002] In advanced wastewater treatment processes, shallow sand filters are a widely used and crucial component, and their operational efficiency directly impacts the wastewater treatment outcome. In a typical structure, the inlet is located at one end of the filter body, above the central distribution channel. Under normal operating conditions, wastewater enters the central distribution channel from the inlet. Once the channel is full, the wastewater flows out through the weir teeth and distributes to the sand layer below, thus achieving filtration.

[0003] However, existing shallow sand filters have significant structural defects in actual operation: due to the inherent drop between the inlet and the central distribution channel, sewage falling from the inlet into the distribution channel directly impacts the water surface. This impact causes some water to overflow at the initial end of the distribution channel, directly interfering with the normal water distribution rhythm.

[0004] Furthermore, as the inflow of water increases, the backlog at the initial end of the distribution channel becomes more severe, and the overflow volume gradually increases, leading to a series of chain problems: the backlog effect in the first half of the distribution channel prevents uniform water distribution as required by the process design; and the water level in the second half of the distribution channel fails to reach the elevation specified by the process due to insufficient water supply, thus failing to meet the preset water distribution conditions.

[0005] In view of the above, there is an urgent need to make targeted improvements to the existing water inlet structure. Utility Model Content

[0006] In view of the technical problems mentioned in the background, the purpose of this application is to provide a water inlet device specifically for shallow sand filters.

[0007] To achieve the above objectives, the technical solution provided by this utility model is as follows:

[0008] A water inlet device for a shallow sand filter includes a housing, an outlet weir plate, a water distribution pipe, a regulating valve, and a lower outlet block.

[0009] The box is U-shaped and is connected to the wall of the shallow sand filter. The inlet of the water inlet pipe is located inside the box.

[0010] The weir opening of the outlet weir plate corresponds to the position of the water distribution channel and is trapezoidal. The three sides of the outlet weir plate are respectively connected to the three outer sides of the box body.

[0011] The lower end of the box is connected to the lower water outlet block through a water distribution pipe equipped with a regulating valve;

[0012] The lower water outlet block is located inside the water distribution channel, and the outlet of the lower water outlet block is parallel to the bottom surface of the water distribution channel.

[0013] The installation height of the outlet weir plate is adjustable, and there are mounting elongated holes on the three sides of the outlet weir plate that connect to the tank. Screws pass through the mounting elongated holes to connect the outlet weir plate to the tank.

[0014] The vertical-to-horizontal ratio of the slope of the weir is 4:1.

[0015] The lower end of the water distribution pipe, where it connects to the lower water outlet block, is provided with multiple reinforcing ribs along its circumference.

[0016] The box body is formed by bending steel plates into one piece.

[0017] Compared with the prior art, the beneficial effects of this utility model are:

[0018] 1. Improve the uniformity of water distribution in the irrigation canal, solving the traditional problems of backlog and overflow.

[0019] The tank adopts a U-shaped structure and is connected to the pool wall. Combined with the built-in design of the inlet of the water inlet pipe, it can reduce the impact energy of water flowing into the distribution channel from the source and reduce the overflow phenomenon at the initial end of the distribution channel. The outlet weir plate adopts a trapezoidal weir mouth and the side slope is designed according to 4:1 (vertical: horizontal). With the corresponding position relationship between the weir mouth and the distribution channel, the water can flow out evenly along the weir mouth, avoiding the problem of water backlog in the first half and insufficient water in the second half of the traditional distribution channel, and realizing the load balance of the entire filter tank.

[0020] 2. Enhance the adaptability of the equipment to meet the needs of different working conditions.

[0021] The outlet weir plate is connected to the box body through an installation elongated hole, allowing for flexible adjustment of the installation height. Combined with the regulating valve on the water distribution pipe, the outlet flow rate and height can be adjusted according to actual working conditions such as influent water volume and water level, ensuring that the water level in the distribution channel always meets the process design elevation. The outlet of the lower outlet block is parallel to the bottom surface of the distribution channel, which can help the water flow smoothly into the distribution channel, further supplementing the stability of water distribution and avoiding the impact of water volume fluctuations on water distribution.

[0022] 3. Improve the structural stability and durability of the device.

[0023] The housing is made of steel plate bent into one piece, with high structural strength and can withstand long-term water flow impact without easily deforming; the circumferential reinforcing ribs at the connection between the water distribution pipe and the lower water outlet block can enhance the shear resistance of the connection node, reduce structural damage caused by water flow impact or the weight of the device, and extend the service life.

[0024] In summary, this device improves water distribution uniformity, operating condition adaptability, and structural stability through structural optimization. It can effectively solve the problems of uneven water distribution and load imbalance in traditional shallow sand filters, ensuring the expected results of deep treatment processes. Attached Figure Description

[0025] Figure 1 A schematic diagram of the structure of the water inlet device for shallow sand filters provided in the embodiments of this application;

[0026] In the diagram, 1-box body, 2-outlet weir plate, 3-distribution pipe, 4-regulating valve, 5-lower outlet block, 6-inlet pipe, 7-distribution channel, 8-reinforcing rib plate, 9-installation elongated hole, 10-shallow sand filter. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0028] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0029] In the description of this patent, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "setting" should be interpreted broadly. For example, they can refer to a fixed connection or setting, a detachable connection or setting, or an integral connection or setting; they can refer to a direct connection or an indirect connection. Those skilled in the art can understand the specific meaning of the above terms in this patent according to the specific circumstances.

[0030] like Figure 1 As shown, this embodiment provides a water inlet device for shallow sand filters, including a tank 1, an outlet weir plate 2, a water distribution pipe 3, a regulating valve 4, and a lower outlet block 5;

[0031] The box 1 is U-shaped and is connected to the wall of the shallow sand filter 10. The inlet of the water inlet pipe 6 is located inside the box 1.

[0032] The weir opening of the outlet weir plate 2 corresponds to the position of the water distribution channel 7 and is trapezoidal. The three sides of the outlet weir plate 2 are respectively connected to the three outer sides of the box body 1.

[0033] The lower end of the box 1 is connected to the lower water outlet block 5 through a water distribution pipe 3 equipped with a regulating valve 4;

[0034] The lower water outlet block 5 is located inside the water distribution channel 7, and the outlet of the lower water outlet block 5 is parallel to the bottom surface of the water distribution channel 7.

[0035] Preferably, the installation height of the outlet weir plate 2 is adjustable, and each of the three sides connecting it to the housing 1 is provided with an installation elongated hole 9. Screws pass through the installation elongated holes 9 to connect the outlet weir plate 2 to the housing 1.

[0036] Preferably, the vertical-to-horizontal ratio of the slope of the weir is 4:1.

[0037] Preferably, the portion where the lower end of the water distribution pipe 3 connects to the lower water outlet block 5 is provided with multiple reinforcing ribs 8 along the circumference.

[0038] Preferably, the box body 1 is integrally formed by bending a steel plate.

[0039] It should be noted that, in this utility model, the outlet weir plate 2 is made of metal or fiberglass, depending on the actual water quality. An elongated hole is used at the connection with the housing to adjust the height of the weir plate. The weir opening is trapezoidal, and the side slope adopts a 4:1 (vertical:horizontal) design to ensure uniform and stable water output. The regulating valve, made of metal or non-metal and connected by a flange, is used to adjust the water flow rate of the lower outlet block, depending on the actual water quality. The lower outlet block is a metal component used to discharge the diverted inlet water and to create a horizontal flow at the bottom of the channel.

[0040] Working Principle: The device provided by this invention is fixed at the inlet of the water inlet pipe of the sand filter tank, and its size is larger than the inlet, which alleviates the impact force of the water flow to a certain extent. An adjustable-height weir plate is installed at the outlet of the tank. When the inflow changes, the upper and lower positions of the weir plate can be adjusted to correct the water flow trajectory and ensure that the water flows smoothly into the distribution channel. When the inflow continues to increase, the weir plate cannot effectively correct the water flow, causing a large amount of water to spill outside the distribution channel. When the initial backlog of water in the distribution channel exceeds the process requirements, the water distribution pipe equipped at the bottom of the tank is used. Based on practical applications, when dealing with large inflow and ultra-large flow volumes, the regulating valve on the water distribution pipe is adjusted to ensure that the outflow from the upper weir meets the water distribution requirements at the initial end of the distribution channel. Excess water flows through the water distribution pipe, regulating valve, and lower outlet block to form a horizontal flow, which then flows along the middle and later sections of the distribution channel. This effectively eliminates backlog at the initial end and meets the water distribution requirements throughout the entire distribution channel, fully satisfying the process requirements.

[0041] It should be noted that all solutions not detailed in this application employ publicly known technologies.

[0042] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A water inlet device specifically for shallow sand filters, characterized in that, It includes a tank body (1), a water outlet weir plate (2), a water distribution pipe (3), a regulating valve (4), and a lower water outlet block (5); The box (1) is U-shaped and is connected to the wall of the shallow sand filter (10). The inlet of the water inlet pipe (6) is located inside the box (1). The weir opening of the outlet weir plate (2) corresponds to the position of the water distribution channel (7) and is trapezoidal. The three sides of the outlet weir plate (2) are respectively connected to the three outer sides of the box body (1). The lower end of the box (1) is connected to the lower water outlet block (5) through a water distribution pipe (3) equipped with a regulating valve (4); The lower water outlet block (5) is located inside the water distribution channel (7) and the outlet of the lower water outlet block (5) is parallel to the bottom surface of the water distribution channel (7).

2. The water inlet device for a shallow sand filter as described in claim 1, characterized in that, The installation height of the outlet weir plate (2) is adjustable. There are mounting elongated holes (9) on the three sides that connect it to the box body (1). Screws pass through the mounting elongated holes (9) to connect the outlet weir plate (2) to the box body (1).

3. The water inlet device for a shallow sand filter as described in claim 1, characterized in that, The vertical-to-horizontal ratio of the slope of the weir is 4:

1.

4. The water inlet device for a shallow sand filter as described in claim 1, characterized in that, The lower end of the water distribution pipe (3) is connected to the lower water outlet block (5), and multiple reinforcing ribs (8) are provided along the circumference.

5. The water inlet device for a shallow sand filter as described in claim 1, characterized in that, The box body (1) is formed by bending steel plate into one piece.

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