A backwashable bar structure for wastewater treatment plants

Abstract

This utility model discloses a backwashable bar screen structure for wastewater treatment plants, relating to the field of wastewater treatment technology. It aims to solve the current technical problem of inconvenient treatment of large-flow, high-impurity wastewater. The structure includes a treatment tank and a bar screen mechanism and a backwashing mechanism installed within the tank. The bar screen mechanism includes a first and second limiting plate symmetrically arranged on the inner wall of the treatment tank. It also includes a driving sprocket and a driven sprocket rotatably mounted on the inner wall of the treatment tank. Furthermore, the bar screen mechanism includes several mutually rotatably connected bar screens, with limiting wheels at the rotatable connection points of the bar screens. The backwashing mechanism includes a backwashing pipe installed on the upper inner wall of the treatment tank. This utility model has the advantages of increasing the contact area by bending the bar screens, improving the interception and carrying efficiency of high-flow wastewater impurities by incorporating a carrying groove, and using an arc-shaped backwashing pipe with equidistant spray heads for thorough cleaning without dead angles, effectively solving the problem of treating large-flow, high-impurity wastewater.

Description

Technical Field

[0001] This utility model relates to the field of wastewater treatment technology, and more specifically, to a backwashable grid structure for wastewater treatment plants. Background Technology

[0002] Backwashing screens are pre-treatment devices for wastewater treatment that integrate "interception and filtration" with "automatic cleaning." Their core function is to remove suspended solids (such as fibers, debris, and silt) from wastewater, protecting downstream pumps, heat exchangers, membrane modules, and other critical equipment from clogging or wear. They are widely used in municipal wastewater, industrial wastewater, waterworks, rainwater harvesting, and other water treatment applications. Their working principle is based on "physical interception + backwashing": During normal operation, wastewater flows through the screen (mostly made of stainless steel, with customizable mesh sizes). Impurities are trapped on the screen surface, and then the screen is flushed from the inside out, removing the trapped impurities and achieving online self-cleaning of the screen without the need for frequent manual disassembly and cleaning.

[0003] In wastewater treatment, backwashing screens filter wastewater through their mesh panels. During filtration, a chain drives the screen upwards, and a hook-like structure at the tail lifts the trapped impurities along with it. Currently, when treating large volumes of wastewater with high levels of impurities, backwashing screens rely solely on the hook-like structure at the tail to lift the trapped impurities, coupled with straight mesh panels, resulting in low efficiency in both impurity and wastewater treatment. Therefore, we propose a backwashable screen structure for wastewater treatment plants. Utility Model Content

[0004] The purpose of this invention is to overcome the shortcomings of the existing technology, adapt to practical needs, and provide a backwashable bar screen structure for sewage treatment plants to solve the current technical problem of inconvenience in treating large-volume sewage with many impurities.

[0005] To solve the above-mentioned technical problems, this utility model provides the following technical solution: a backwashable bar structure for a sewage treatment plant, comprising a treatment tank and a bar structure and a backwashing mechanism disposed within the treatment tank. The bar structure includes a first limiting plate and a second limiting plate symmetrically disposed on the inner wall of the treatment tank. Both the first limiting plate and the second limiting plate have limiting openings on their front sides. The bar structure also includes a driving sprocket and a driven sprocket rotatably mounted on the inner wall of the treatment tank. A chain is disposed between the driving sprocket and the driven sprocket, and the chain is located within the limiting openings. The bar structure also includes a plurality of bar screens rotatably connected to each other. Limiting wheels are disposed on the side ends of the rotatable connections of the bar screens. The limiting wheels are located within the limiting openings and connected to the chain. The backwashing mechanism includes a backwashing pipe disposed on the upper inner wall of the treatment tank.

[0006] Preferably, a water inlet is provided at the lower front of the treatment box, and guide plates are symmetrically arranged on the outside of the water inlet on the front of the treatment box. The guide plates are arranged in a figure-eight shape. A discharge plate is provided at the upper front of the treatment box. The discharge plate is arranged in an arc shape along the short axis and is located within the grid mechanism.

[0007] Preferably, the grid plate includes several curved portions along its short axis, the curved portions are curved in an arc shape, adjacent curved portions form an S-shape, and the several curved portions form several carrying grooves on the front side of the grid plate.

[0008] Preferably, a motor is provided on the back of the processing box, the output shaft of the motor is connected to the shaft of the drive sprocket, and a drive port is provided on the inner ring of the second limiting plate, with the chain teeth of the drive sprocket and the driven sprocket both located in the drive port.

[0009] Preferably, the backwash pipe includes several arc-shaped sections along its long axis, and connecting sections are provided between the arc-shaped sections to connect adjacent arc-shaped sections end to end. Spray heads are provided at equal intervals at the lower end of each arc-shaped section.

[0010] Preferably, a water outlet pipe is provided on the back of the treatment tank, a water pump is provided at the upper end of the water outlet pipe, a water pump is provided with a water suction pipe and a water delivery pipe, the water suction pipe extends into the water outlet pipe, and the end of the water delivery pipe is provided with several connecting pipes connected to the backwash pipe.

[0011] Compared with the prior art, the beneficial effects of this utility model are: 1. This utility model, through its structural design, features a grid panel with several arc-shaped bends along its short axis, forming an S-shaped profile with adjacent bends. Compared to traditional straight grid panels, this increases the contact area by 30%-50%. In high-flow-rate wastewater scenarios, the larger contact area can simultaneously intercept more suspended impurities (such as fibers, debris, and silt), preventing impurities from accumulating on the grid due to excessive water flow and significantly reducing the risk of clogging in subsequent treatment equipment. Furthermore, the bends form several independent carrying grooves on the front of the grid panel, each capable of stably accommodating impurities. This replaces the traditional single carrying method of the "tail hook structure," improving impurity carrying efficiency and ensuring efficient separation of impurities from wastewater. This design is suitable for wastewater treatment with a high amount of impurities, solving the current problem of inconvenience in treating large-flow-rate wastewater with a high amount of impurities.

[0012] 2. This utility model also features a backwash pipe structure. The backwash pipe consists of several arc-shaped sections connected end-to-end by connecting parts, forming a circular outline that matches the upper movement trajectory of the grid plate. The arc structure allows the spray heads to "fit snugly" cover the surface of the grid plate, eliminating any dead corners in the rinsing process. This avoids the problem of localized impurity residue caused by uneven coverage in traditional straight rinsing pipes. The spray heads, equidistantly positioned at the lower end of the arc-shaped sections, combined with the stable water pressure distributed by the water pump through the connecting pipe, can evenly spray backwash water onto the grid plate, effectively cleaning it and quickly restoring its filtration capacity. Furthermore, the backwash water source is taken from the outlet pipe on the back of the treatment tank (i.e., filtered clean water), which is pumped out and recycled, eliminating the need for additional tap water connection and effectively saving water resources. Attached Figure Description

[0013] Figure 1 This is a front view structural diagram of the present utility model; Figure 2 This is a cross-sectional structural diagram of the present invention; Figure 3 This is a schematic diagram of the grille mechanism structure of this utility model; Figure 4 This is a schematic diagram of a partial grid mechanism structure of the present invention; Figure 5 This is a schematic diagram of the grid panel structure of this utility model; Figure 6 This is a schematic diagram of the backwashing mechanism of this utility model.

[0014] The following are the labels in the diagram: 101, processing box; 102, guide plate; 103, water outlet pipe; 200, grating mechanism; 201, first limiting plate; 202, second limiting plate; 2021, drive port; 203, chain; 204, drive sprocket; 205, driven sprocket; 206, grating screen; 2061, curved section; 2062, carrying trough; 2063, limiting wheel; 207, motor; 300, backwashing mechanism; 301, backwashing pipe; 3011, arc-shaped section; 3012, connecting section; 302, discharge plate; 303, connecting pipe; 304, spray head; 305, water pump. Detailed Implementation

[0015] like Figures 1 to 6As shown, this utility model relates to a backwashable bar structure for a wastewater treatment plant, including a treatment tank 101 and a bar structure 200 and a backwashing mechanism 300 disposed within the treatment tank 101. The bar structure 200 includes a first limiting plate 201 and a second limiting plate 202 symmetrically disposed on the inner wall of the treatment tank 101. Both the first limiting plate 201 and the second limiting plate 202 have limiting openings on their front sides. The bar structure 200 also includes a drive sprocket 204 and a driven sprocket 205 rotatably mounted on the inner wall of the treatment tank 101. A chain 203 is disposed between the drive sprocket 204 and the driven sprocket 205. The chain 203 is located within the limiting openings. The bar structure 200 also includes a plurality of bar screens 206 rotatably connected to each other. Limiting wheels 2063 are disposed on the side ends of the rotatable connections of the bar screens 206. The limiting wheels 2063 are located within the limiting openings and connected to the chain 203. The backwashing mechanism 300 includes a backwashing pipe 301 disposed on the upper inner wall of the treatment tank 101. This utility model increases the contact area by bending the grid plate 206, improves the interception and carrying efficiency of impurities in large-flow sewage by setting the carrying groove 2062, and uses the arc-shaped backwash pipe 301 with equidistant spray heads 304 to clean without dead angles, effectively solving the problem of treating large-flow sewage with many impurities.

[0016] Specifically, a water inlet is provided at the lower front of the treatment tank 101. A guide plate 102 is symmetrically arranged on the outside of the water inlet on the front of the treatment tank 101, with a V-shape. A discharge plate 302 is provided at the upper front of the treatment tank 101, with an arc shape along its short axis, and is located within the grid mechanism 200. The water inlet is located at the bottom, conforming to the gravity direction of natural sewage flow, reducing energy consumption during sewage transport. The V-shaped guide plate 102 can gather dispersed sewage to the water inlet, preventing sewage overflow and improving water intake efficiency. The arc-shaped discharge plate 302 facilitates the discharge of impurities from backwashing from the treatment tank 101.

[0017] Furthermore, the bar screen 206 includes several curved portions 2061 along its short axis. The curved portions 2061 are curved in an arc shape, and adjacent curved portions 2061 form an S-shape. The several curved portions 2061 form several carrying grooves 2062 on the front side of the bar screen 206. Compared with the traditional straight bar screen 206, the S-shaped curved portions 2061 significantly increase the contact area with sewage, improving the interception efficiency of impurities, especially for the interception effect of fine impurities in large-flow sewage. The formation of the carrying grooves 2062 solves the problem of weak impurity carrying capacity of the traditional hook-shaped structure. Each carrying groove 2062 can independently hold a certain amount of impurities. During the movement of the bar screen 206, it can stably carry impurities away from the sewage and transport them to the top. Combined with the backwashing mechanism 300, it significantly improves the impurity treatment efficiency.

[0018] It is worth noting that a motor 207 is installed on the back of the processing box 101. The output shaft of the motor 207 is connected to the shaft of the drive sprocket 204. The inner ring of the second limiting plate 202 has a drive port 2021, and the chain teeth of the drive sprocket 204 and the driven sprocket 205 are located in the drive port 2021. The motor 207 acts as a power source, directly driving the drive sprocket 204 to rotate through the output shaft. The drive sprocket 204 drives the driven sprocket 205 to rotate through the chain 203, thereby causing the grid plate 206 to move. The setting of the drive port 2021 provides movement space for the chain teeth of the sprockets. At the same time, the second limiting plate 202 can play an auxiliary limiting role for the chain 203, preventing the chain 203 from deviating or falling off during transmission, ensuring the stability of the operation of the grid mechanism 200, and thus ensuring the continuous and stable operation of the grid plate 206.

[0019] It is worth noting that the backwash pipe 301 includes several arc-shaped sections 3011 along its long axis, and connecting sections 3012 are provided between these arc-shaped sections 3011. The connecting sections 3012 connect adjacent arc-shaped sections 3011 end to end, and spray heads 304 are equidistantly arranged at the lower end of the arc-shaped sections 3011. The design of the arc-shaped sections 3011 is adapted to the shape of the grid plate 206 when it moves upward, forming a circular outline. This allows the spray heads 304 to better cover the surface of the grid plate 206, and the backwash water can be sprayed more accurately onto the grid plate 206, improving the backwashing effect. The connecting sections 3012 connect multiple arc-shaped sections 3011 into a whole, enhancing the coverage of the backwash pipe 301, preventing washing dead corners, ensuring that impurities on the grid plate 206 are thoroughly washed away, and restoring the filtration capacity of the grid plate 206.

[0020] It is worth noting that a water outlet pipe 103 is provided on the back of the treatment tank 101, and a water pump 305 is provided at the upper end of the water outlet pipe 103. The water pump 305 is provided with a water suction pipe and a water delivery pipe. The water suction pipe extends into the water outlet pipe 103, and the end of the water delivery pipe is provided with several connecting pipes 303 that connect to the backwash pipe 301. The water outlet pipe 103 is used to discharge the filtered clean water, providing a water source for the backwashing mechanism 300, realizing the recycling of sewage, eliminating the need for additional clean water supply, and reducing sewage treatment costs. The water pump 305 serves as the power device for backwash water, drawing clean water from the water outlet pipe 103 through the water suction pipe, and then delivering it to the backwash pipe 301 through the water delivery pipe and connecting pipes 303. The arrangement of multiple connecting pipes 303 ensures that each spray head 304 has a stable water pressure and flow rate, ensuring the consistency of the backwashing effect.

[0021] Working Principle: This embodiment provides a backwashable bar screen structure for wastewater treatment plants. In use, first, the motor 207 on the back of the treatment tank 101 is started. The output shaft of the motor 207 directly drives the drive sprocket 204 connected to its shaft to rotate. Since the drive sprocket 204 and the driven sprocket 205 are connected by a chain 203, and the teeth of both the drive sprocket 204 and the driven sprocket 205 are located within the drive opening 2021 on the inner ring of the second limiting plate 202, when the drive sprocket 204 rotates, it drives the driven sprocket 205 to rotate synchronously via the chain 203. The chain 203 is located within the limiting openings on the front of the first limiting plate 201 and the second limiting plate 202. Simultaneously, several mutually rotatably connected bar screens... The limiting wheel 2063, located at the side end of the rotating connection, is also located within the limiting port and connected to the chain 203. Therefore, the rotation of the chain 203 will drive the limiting wheel 2063 to move along the limiting port, thereby causing the entire grid panel 206 assembly to begin cyclical movement. Then, the wastewater to be treated enters from the inlet at the lower front of the treatment tank 101. Under the action of the symmetrically arranged figure-eight-shaped guide plates 102 on the outside of the inlet, the wastewater is gathered and guided into the treatment tank 101, preventing wastewater overflow and improving the inlet efficiency. At this time, the moving grid panel 206 intercepts and filters the incoming wastewater. Since the grid panel 206 has several curved sections 2061 along the short axis, adjacent curved sections 2061 form an S-shaped structure. This design significantly increases the contact area between the bar screen 206 and the sewage, enabling more efficient interception of impurities in large-flow sewage. Simultaneously, the several curved sections 2061 forming several carrying grooves 2062 on the front of the bar screen 206 stably contain the intercepted impurities, avoiding the weak impurity-carrying capacity of traditional hook-shaped structures. As the bar screen 206 continues to move, the carrying grooves 2062 gradually separate the impurities from the sewage and transport them upwards. When the bar screen 206 carrying impurities moves to the upper position of the treatment tank 101, the water pump 305 at the upper end of the outlet pipe 103 is activated. The water pump 305 draws pre-filtered clean water from the outlet pipe 103 through the suction pipe (achieving sewage recycling and reducing water loss). (Low cost), and deliver clean water through a conveying pipe to several connecting pipes 303 at the end. The connecting pipes 303 guide the clean water into the backwash pipes 301 set on the upper inner wall of the treatment tank 101. The backwash pipes 301 are composed of several arc-shaped parts 3011 and connecting parts 3012 along the long axis. The connecting parts 3012 connect adjacent arc-shaped parts 3011 end to end. The design of the arc-shaped parts 3011 is adapted to the shape of the grid plate 206 when it moves to the top, so that the spray heads 304 set at equal intervals at the lower end of the arc-shaped parts 3011 can fully cover the surface of the grid plate 206. The clean water is sprayed out through the spray heads 304 at a certain pressure to efficiently backwash the impurities carried on the grid plate 206 and thoroughly wash the impurities off from the carrying tank 2062.The impurities washed off fall onto the discharge plate 302 under gravity, which guides them to slide smoothly out of the treatment tank 101, completing the discharge of impurities. Meanwhile, the clean water filtered by the bar screen mechanism 200 is discharged from the outlet pipe 103 located at the back. If continuous wastewater treatment is required, simply maintaining the stable operation of the motor 207 and water pump 305 allows for continuous cyclical operation of wastewater filtration, impurity transport, backwashing cleaning, and clean water discharge, effectively solving the problem that traditional bar screen structures are inconvenient for handling large flows of wastewater with many impurities.

[0022] The embodiments disclosed herein are preferred embodiments, but are not limited thereto. Those skilled in the art can readily grasp the spirit of this utility model based on the above embodiments and make different extensions and variations. However, as long as they do not depart from the spirit of this utility model, they are all within the protection scope of this utility model.

Claims

1. A backwashable grid structure for use in a sewage treatment plant, characterised in that, The system includes a treatment tank (101) and a grille mechanism (200) and a backwashing mechanism (300) disposed within the treatment tank (101). The grille mechanism (200) includes a first limiting plate (201) and a second limiting plate (202) symmetrically arranged on the inner wall of the treatment tank (101). Limit openings are provided on the front sides of both the first limiting plate (201) and the second limiting plate (202). The grille mechanism (200) also includes a drive sprocket (204) and a driven sprocket (205) rotatably mounted on the inner wall of the treatment tank (101). A chain (203) is provided between the driving sprocket (204) and the driven sprocket (205). The chain (203) is located in the limiting port. The grid mechanism (200) also includes a number of grid plates (206) that are rotatably connected to each other. A limiting wheel (2063) is provided at the side end of the rotatable connection of the grid plate (206). The limiting wheel (2063) is located in the limiting port and connected to the chain (203). The backwashing mechanism (300) includes a backwashing pipe (301) provided on the upper inner wall of the treatment tank (101).

2. A backwashable screen structure for use in a sewage treatment plant according to claim 1, characterised in that, The treatment tank (101) has a water inlet at the lower front part. A guide plate (102) is symmetrically arranged on the front of the treatment tank (101) outside the water inlet. The guide plate (102) is arranged in a figure-eight shape. A discharge plate (302) is arranged at the upper front part of the treatment tank (101). The discharge plate (302) is arranged in an arc shape along the short axis direction. The discharge plate (302) is located inside the grid mechanism (200).

3. The backwashable bar structure for wastewater treatment plants according to claim 2, characterized in that, The grid plate (206) includes several curved portions (2061) along the short axis direction. The curved portions (2061) are curved in an arc shape, and adjacent curved portions (2061) form an S-shape. The several curved portions (2061) form several carrying grooves (2062) on the front side of the grid plate (206).

4. The backwashable bar structure for wastewater treatment plants according to claim 3, characterized in that, A motor (207) is provided on the back of the processing box (101). The output shaft of the motor (207) is connected to the shaft of the drive sprocket (204). The inner ring of the second limiting plate (202) is provided with a drive port (2021). The chain teeth of the drive sprocket (204) and the driven sprocket (205) are both located in the drive port (2021).

5. The backwashable bar structure for a wastewater treatment plant according to claim 4, characterized in that, The backwash pipe (301) includes several arc-shaped sections (3011) along its long axis. A connecting section (3012) is provided between the arc-shaped sections (3011). The connecting section (3012) connects the adjacent arc-shaped sections (3011) end to end. Spray heads (304) are provided at equal intervals at the lower end of the arc-shaped sections (3011).

6. The backwashable bar structure for a wastewater treatment plant according to claim 5, characterized in that, The back of the treatment tank (101) is provided with a water outlet pipe (103), and a water pump (305) is provided at the upper end of the water outlet pipe (103). The water pump (305) is provided with a water pump pipe and a water delivery pipe. The water pump pipe extends into the water outlet pipe (103), and the end of the water delivery pipe is provided with several connecting pipes (303) that are connected to the backwash pipe (301).

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