Pulse backwash mechanical bar screen equipment

Abstract

This utility model discloses a pulse backwashing mechanical bar screen device, including a main body, a pulse backwashing unit, and a pumping unit. The main body includes an outer shell cavity and an orifice bar screen. The outer shell cavity is also provided with a one-way air inlet, and a one-way valve is built into the one-way air inlet. The one-way valve conducts from the outside of the outer shell cavity to the inside. The pulse backwashing unit includes a backwash water pipe, an electromagnetic pulse valve, and a backwash water flange interface. The electromagnetic pulse valve is connected in series with the backwash water pipe. The outlet end of the backwash water pipe extends into the internal cavity enclosed by the orifice bar screen. The pumping unit includes a pumping pipe and a pumping flange interface. The inlet end of the pumping pipe is located in the internal cavity. A check valve is provided on the pumping pipe. When the electromagnetic pulse valve is opened for backwashing, the pressure inside the outer shell cavity increases, and the one-way valve closes under the action of pressure difference, forming a sealed space. When the electromagnetic pulse valve is closed, the pressure inside the outer shell cavity decreases, and the one-way valve opens to replenish air to balance the internal and external pressures.

Description

Technical Field

[0001] This utility model relates to the field of wastewater treatment technology, and in particular to a pulse backwash mechanical grid device. Background Technology

[0002] With the acceleration of global urbanization and industrialization, water scarcity and water pollution have become increasingly prominent issues. Wastewater treatment, as a core component of ensuring water ecological security and supporting sustainable development, has become a key area of ​​global environmental governance. Domestic wastewater treatment is particularly important. However, most domestic wastewater is collected through municipal pipe networks, which mix with a large amount of solid waste during the collection process. This solid waste is insoluble in water and accumulates at the inlet of wastewater treatment plants, causing blockages in the front-end pumps. This leads to frequent maintenance of wastewater lifting equipment, affecting normal wastewater treatment and increasing treatment costs.

[0003] Mechanical bar screens are key pretreatment equipment at the inlet of sewage treatment plants and pumping stations. Their function is to intercept and remove suspended solids, floating solids, and particulate matter in sewage to protect subsequent booster pumps, pipelines, and treatment equipment from blockage and damage.

[0004] Currently, common traditional mechanical bar screens mainly include rotary bar screens, stepped bar screens, and rake bar screens. Among them, rotary mechanical bar screens are widely used. Taking CN216236105U as an example, it includes a geared motor, rake tooth link, and frame. It uses a rake to lift the intercepted debris to the top for removal. However, it has the following drawbacks: First, it is prone to clogging: When intercepting a large amount of fibrous or entangled debris (such as hair and plastic filaments), the screen gaps are prone to clogging and entanglement, resulting in reduced water flow and requiring manual cleaning, which affects continuous operation. Second, it has high energy consumption and high operating costs: Its mechanical transmission structure is complex, and the drive motor and the matching cleaning water pump need to run continuously or intermittently, resulting in high overall power consumption. Third, it requires frequent maintenance: Mechanical moving parts (such as chains and rake teeth) are prone to corrosion and wear, requiring frequent replacement, resulting in a large workload and high cost of maintenance.

[0005] A few mechanical bar screens are also equipped with backwashing devices. For example, CN209602125 discloses a vortex bar screen with backwashing function, including a bar screen cylinder installed above a regulating tank and a backwashing mechanism. The bar screen cylinder includes a cylindrical wall and a bar screen at the bottom of the cylinder wall, with an inlet pipe at the upper part of the cylinder wall. The backwashing mechanism includes a backwashing water tank and a backwashing pipe installed below the bar screen cylinder. One end of the backwashing pipe is connected to the bottom of the backwashing water tank, and the other end is connected to at least one water jet outlet. A jet nozzle is installed at the water jet outlet, and the water jet outlets are all located below the bar screen, with the jet nozzles all facing the bar screen. An electric valve and a pipeline booster pump are installed on the backwashing pipe. This vortex bar screen with backwashing function uses a backwashing pipe to perform high-pressure water flushing on the bar screen at the bottom of the bar screen cylinder to remove small particulate waste clogging the bar screen, reduce head loss, and ensure the bar screen's water intake capacity.

[0006] However, it still has problems such as complex structure and high energy consumption. Therefore, it is necessary to study a new technical solution to solve these problems. Utility Model Content

[0007] In view of this, the present invention addresses the deficiencies of the existing technology and its main purpose is to provide a pulse backwash mechanical grid device, which has a simple structure, low energy consumption, can automatically and efficiently clean, and operates stably.

[0008] To achieve the above objectives, the present invention adopts the following technical solution: A pulse backwash mechanical bar screen device includes a main body, a pulse backwash unit, and a pumping unit; The main body of the device includes an outer shell cavity and a perforated plate grid that extends through the lower end of the outer shell cavity. The perforated plate grid includes peripheral mesh plates for intercepting solid impurities in the sewage. The outer shell cavity is also provided with a one-way air inlet, and the one-way air inlet has a built-in one-way valve. The one-way valve is directed from the outside of the outer shell cavity to the inside. The pulse backwash unit includes a backwash water pipe, an electromagnetic pulse valve, and a backwash water flange interface. The electromagnetic pulse valve is connected in series with the backwash water pipe to control the flow of backwash water. The outlet end of the backwash water pipe extends into the internal cavity enclosed by the perforated plate grid. The pumping unit includes a pumping pipe and a pumping flange interface. The inlet end of the pumping pipe is located inside the internal cavity and is used to pump out the filtered sewage. A check valve is provided on the pumping pipe. When the electromagnetic pulse valve is opened for backwashing, the pressure inside the outer shell cavity increases, and the one-way valve closes under the pressure difference, forming a sealed space; when the electromagnetic pulse valve is closed, the pressure inside the outer shell cavity decreases, and the one-way valve opens to replenish air to balance the internal and external pressures.

[0009] As a preferred embodiment, the electromagnetic pulse valve is connected to a constant pressure water supply pump, and the constant pressure water supply pump and the electromagnetic pulse valve are electrically connected to a control system, which controls the start and stop of the constant pressure water supply pump and the pulse frequency of the electromagnetic pulse valve.

[0010] As a preferred embodiment, the perforated grid is made of corrosion-resistant perforated mesh plate, with the side mesh plates on its three sides connected in a C-shape and welded to the bottom mesh plate for sealing.

[0011] As a preferred embodiment, the control system is a time interval controller or a PLC; the main body of the equipment also includes a differential pressure sensor, which is used to detect the liquid level difference inside and outside the orifice plate grid and is electrically connected to the control system.

[0012] As a preferred embodiment, a filter is also connected in series on the backwash water pipe, and the filter is located at the water inlet end of the electromagnetic pulse valve.

[0013] As a preferred embodiment, the outer shell cavity is provided with a liquid level observation window and a liquid level indicator line.

[0014] As a preferred embodiment, the main body of the equipment has a modular structure, and both its backwash water flange interface and its pumping flange interface are standard flange interfaces.

[0015] As a preferred embodiment, a slag hopper for collecting impurities can also be detachably connected to the lower part of the main body of the device.

[0016] As a preferred embodiment, the water pump is connected to the water pipe.

[0017] The outer shell cavity is a pentahedron with an open bottom end, and the upper end of the perforated plate grid is connected to the open bottom end. The main body of the equipment is installed on the front side of the mounting plate, and the rear ends of the side mesh plates and bottom mesh plates on the three peripheral sides of the perforated plate grid are all assembled with the front side of the mounting plate.

[0018] This utility model has significant advantages and beneficial effects compared with the prior art. Specifically, as can be seen from the above technical solution, it mainly involves the arrangement of a main body, a pulse backwash unit, and a pumping unit. The main body includes an outer shell cavity and a perforated plate grid connected to the lower end of the outer shell cavity. The outer shell cavity is also equipped with a one-way air inlet and a one-way valve. An electromagnetic pulse valve is connected in series with the backwash water pipe. The outlet end of the backwash water pipe extends into the internal cavity enclosed by the perforated plate grid, and the inlet end of the pumping pipe is located inside the internal cavity. When the electromagnetic pulse valve is opened for backwashing, the pressure inside the outer shell cavity increases, and the one-way valve closes under the action of pressure difference, forming a sealed... The enclosed space utilizes a high-pressure, instantaneous water flow generated by the pulse backwash unit to powerfully backwash the perforated screen from the inside out. This effectively strips and removes fibrous and particulate impurities adhering to the mesh, improving backwashing efficiency and fundamentally solving the technical problems of traditional screens, such as easy clogging, blind spots in cleaning, high energy consumption, and frequent maintenance. When the electromagnetic pulse valve is closed, the internal pressure of the outer shell cavity decreases, and the one-way valve opens to replenish air and balance the internal and external pressures. The one-way air inlet design ensures dynamic pressure balance during normal wastewater treatment, effectively preventing equipment deformation or reduced pumping efficiency due to negative pressure, resulting in high system reliability. Furthermore, its simple structure and convenient maintenance, with no complex mechanical transmission parts and relying on hydraulic cleaning, minimize mechanical failure points, reduce daily maintenance workload, and extend service life.

[0019] Furthermore, this type of pulse backwash mechanical bar screen equipment, because the pulse backwash unit and the pumping unit are both located in the main body of the equipment, is easy to modularly design, facilitates flexible combination and expansion, occupies a small area, and is applicable to a wide range of scenarios.

[0020] To more clearly illustrate the structural features and effects of this utility model, the following detailed description of this utility model is provided in conjunction with the accompanying drawings and specific embodiments. Attached Figure Description

[0021] Figure 1 This is a structural diagram of a pulse backwash mechanical bar screen device according to an embodiment of the present invention; Figure 2 This is a structural diagram (front view) showing three pulse backwashing mechanical bar screen devices arranged side by side according to an embodiment of this utility model. Figure 3 This is a top view showing the structure of three pulse backwash mechanical bar screen devices arranged side by side according to an embodiment of this utility model. Figure 4 This is a top view showing the structure of three pulse backwash mechanical bar screens arranged in a staggered manner according to an embodiment of this utility model. Figure 5 This is a control block diagram of an embodiment of the present utility model. Detailed Implementation

[0022] Please refer to Figures 1 to 5As shown, it illustrates the specific structure of an embodiment of the present invention.

[0023] In the description of this utility model, it should be noted that the terms "upper", "lower", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0024] A pulse backwash mechanical bar screen is used in the wastewater pretreatment stage and has a pulse backwash function. It includes a main body, a pulse backwash unit, and a pumping unit. The pulse backwash unit and the pumping unit are both located inside the main body, which facilitates modularization.

[0025] The main body of the equipment includes an outer shell cavity 7 and a perforated plate grid 9 connected and extending through the lower end of the outer shell cavity 7. The perforated plate grid 9 includes peripheral mesh plates (made of corrosion-resistant perforated mesh plates, such as stainless steel perforated mesh plates, with a aperture range of 1-10mm) to intercept solid impurities in wastewater. The perforated plate grid 9 is made of corrosion-resistant perforated mesh plates, with its three peripheral side mesh plates connected in a C-shape and welded to the bottom mesh plate for sealing. The three sides and the bottom are all filter surfaces, and the perforated plate grid 9 is permanently positioned below the water surface at the water intake point. Essentially, the perforated plate grid 9 is welded to the lower end of the outer shell cavity 7 to form a sealed enclosure. The side mesh panels on the three sides can be three vertical panels bent and connected or welded in sequence, or one side mesh panel can be designed as an arc, with the two side mesh panels connected to the two ends of the arc as vertical panels. From a top-down view, the arc-shaped side mesh panel protrudes beyond the outer shell cavity 7. A baffle extending from the bottom of the outer shell cavity 7 at the top of the perforated plate grid 9 is used to shield the top of the arc-shaped side mesh panel, allowing the perforated plate grid 9 to form a larger filtration area. The outer shell cavity 7 is provided with a liquid level observation window and a liquid level indicator line 8. The outer shell cavity 7 is also provided with a one-way air inlet, which contains a one-way valve 6. The one-way valve 6 conducts from the outside of the outer shell cavity 7 to the inside. The one-way valve core is normally closed by default. When a negative pressure is formed inside the outer shell cavity 7, the external atmospheric pressure can open the one-way valve core to supply air to the inside; when the inside is under positive pressure, the pressure makes the one-way valve core close more tightly.

[0026] The pulse backwash unit includes a backwash water pipe 11, an electromagnetic pulse valve 2, and a backwash water flange interface 1. The electromagnetic pulse valve 2 is connected in series with the backwash water pipe 11 to control the flow of backwash water. The outlet end of the backwash water pipe 11 extends into the internal cavity enclosed by the perforated plate grid 9. Figure 1As shown, the backwash water pipe 11 extends vertically, and its upper end is connected to a water pipe elbow 3. The water pipe elbow 3 is L-shaped or 90-degree arc-shaped, and its lower end is connected to the upper end of the backwash water pipe 11. Its upper end extends outward for the installation of the electromagnetic pulse valve 2. A backwash water flange interface 1 is installed on the outer end of the electromagnetic pulse valve 2 for connecting to the pipe joint of the constant pressure water supply pump.

[0027] The pumping unit includes a pumping pipe 10 and a pumping flange interface 5. The inlet end of the pumping pipe 10 is located in the internal cavity and is used to pump out the filtered sewage. A check valve 4 is provided on the pumping pipe 10 to prevent sewage backflow when the pump stops. When the electromagnetic pulse valve 2 is opened for backwashing, the internal pressure of the outer shell cavity 7 increases, and the one-way valve 6 closes under the action of pressure difference, forming a sealed space (equivalent to a sealed high-pressure chamber); when the electromagnetic pulse valve 2 is closed, the internal pressure of the outer shell cavity 7 decreases, and the one-way valve 6 opens, allowing external airflow to smoothly enter the equipment to replenish air and balance the internal and external pressures, maintaining pressure balance.

[0028] In practical use, the electromagnetic pulse valve 2 is connected to a constant pressure water supply pump, and the pump is connected to the water suction pipe 10. The constant pressure water supply pump and the electromagnetic pulse valve 2 are electrically connected to a control system 14, which controls the start and stop of the constant pressure water supply pump and the pulse frequency of the electromagnetic pulse valve 2. Thus, the pulse backwash unit uses the constant pressure pump and the electromagnetic pulse valve to control the backwash frequency. When the electromagnetic pulse valve 2 is open, a positive pressure is formed inside the equipment, which backwashes out impurities and waste sludge blocking the outside of the orifice plate grid 9, maintaining the grid's water filtration function. The control system 14 is a time interval controller or a PLC. Furthermore, the main body of the equipment also includes a differential pressure sensor 13, which is used to detect the liquid level difference inside and outside the orifice plate grid 9 and is electrically connected to the control system 14. When the liquid level difference exceeds a preset value, the control system 14 triggers the backwash program. Therefore, it uses differential pressure control to achieve intelligent backwashing, which is timely and energy-saving.

[0029] Preferably, the main body of the equipment has a modular structure, and its backwash water flange interface 1 and pumping flange interface 5 are both standard flange interfaces, which facilitates the parallel stacking of multiple devices to meet the needs of different water treatment volumes, such as... Figures 2 to 4As shown, an installation plate 200 provides an installation position for the pulse backwash mechanical bar screen 100. The pulse backwash mechanical bar screen 100 is detachably installed on the installation plate 200. The outer shell cavity 7 is a pentahedron with an open bottom, and the upper end of the perforated plate bar 9 is connected to the open bottom. The main body of the device is installed on the front side of the installation plate 200. The rear ends of the side mesh panels on the three peripheral sides and the bottom mesh panel of the perforated plate bar 9 are all assembled with the front side of the installation plate 200. The installation plate 200 is detachably installed inside the wall of the sewage tank 300. Multiple pulse backwash mechanical bar screens 100 can be installed on the same installation plate 200, or each can be installed on an independent installation plate 200. Multiple pulse backwash mechanical bar screens 100 can be flexibly arranged in different positions within the sewage tank 300.

[0030] Furthermore, before the backwash water flange interface 1, a filter 12 is connected in series on the backwash water pipe 11. The filter 12 is located at the water inlet end of the electromagnetic pulse valve 2 to prevent impurities from clogging the electromagnetic pulse valve 2.

[0031] Furthermore, a slag hopper for collecting impurities can be detachably connected to the lower part of the main body of the device. This hopper collects impurities that are flushed down during backwashing. During backwashing, the flushed impurities can naturally settle into the slag hopper for collection, facilitating regular cleaning.

[0032] The working principle of this pulse backwash mechanical bar screen equipment is described below: 1. Filtration state: Wastewater enters the main body of the equipment through the perforated plate grid 9, impurities are trapped outside the perforated plate grid 9, and the purified water is pumped away by the subsequent water pump (or lift pump) through the water pumping pipe 10.

[0033] 2. Backwash trigger: The control system 14 (which may be a PLC) can issue a command based on a preset time or by receiving a signal from the differential pressure sensor 13 (when the liquid level difference inside and outside the orifice plate grid 9 increases, it indicates severe blockage).

[0034] 3. Backwashing process: The control system 14 starts the constant pressure water supply pump and instantly opens the electromagnetic pulse valve 2. High pressure water flows through the backwash water pipe 11 and rushes into the main body of the equipment. The internal pressure increases sharply, the one-way air inlet valve 6 closes, forming a closed high pressure chamber. The high pressure water violently washes the perforated plate grid 9 from the inside out, washing off the blockages on its surface.

[0035] 4. Pressure Balance: After the electromagnetic pulse valve 2 closes, the constant pressure water supply pump stops. Due to the operation of the pumping unit, the pressure inside the main body of the equipment drops, creating a negative pressure trend. At this time, the external atmospheric pressure pushes open the one-way air inlet valve 6, allowing air to enter and quickly balance the internal and external pressures, ensuring that the pumping process resumes immediately and the equipment operates smoothly.

[0036] The key design feature of this invention lies in the arrangement of the main body of the device, the pulse backwash unit, and the pumping unit. The main body includes an outer shell cavity and a perforated plate grid connected to the lower end of the outer shell cavity. The outer shell cavity is also equipped with a one-way air inlet and a one-way valve. The electromagnetic pulse valve is connected in series with the backwash water pipe, and the outlet end of the backwash water pipe extends into the internal cavity enclosed by the perforated plate grid. The inlet end of the pumping pipe is located inside the internal cavity. When the electromagnetic pulse valve is opened for backwashing, the pressure inside the outer shell cavity increases, and the one-way valve closes under the pressure difference, forming a sealed space. This pressure is then generated by the pulse backwash unit. The high-pressure, instantaneous water flow powerfully backwashes the perforated screen from the inside out, effectively stripping and removing fibrous and particulate impurities attached to the mesh, improving backwashing efficiency and fundamentally solving the technical problems of traditional screens such as easy clogging, blind spots in cleaning, high energy consumption, and frequent maintenance. When the electromagnetic pulse valve is closed, the internal pressure of the outer shell cavity decreases, and the one-way valve opens to replenish air to balance the internal and external pressures. The one-way air inlet design ensures dynamic pressure balance during normal sewage treatment, effectively avoiding equipment deformation or reduced pumping efficiency due to negative pressure, resulting in high system reliability. Furthermore, its simple structure and convenient maintenance, with no complex mechanical transmission parts and relying on water-powered cleaning, minimize mechanical failure points, reduce daily maintenance workload, and extend service life.

[0037] Furthermore, this type of pulse backwash mechanical bar screen equipment, because the pulse backwash unit and the pumping unit are both located in the main body of the equipment, is easy to modularly design, facilitates flexible combination and expansion, occupies a small area, and is applicable to a wide range of scenarios.

[0038] The above description is merely a preferred embodiment of the present utility model and does not constitute any limitation on the technical scope of the present utility model. Therefore, any minor modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present utility model shall still fall within the scope of the technical solution of the present utility model.

Claims

1. A pulse backwashing mechanical bar screen device, characterized in that, It includes the main body of the equipment, the pulse backwash unit, and the pumping unit; The main body of the equipment includes an outer shell cavity (7) and a perforated plate grid (9) that extends through the lower end of the outer shell cavity (7). The perforated plate grid (9) includes a peripheral mesh plate for intercepting solid impurities in sewage. The outer shell cavity (7) is also provided with a one-way air inlet. The one-way air inlet has a built-in one-way valve (6). The one-way valve (6) is directed from the outside of the outer shell cavity (7) to the inside. The pulse backwash unit includes a backwash water pipe (11), an electromagnetic pulse valve (2), and a backwash water flange interface (1). The electromagnetic pulse valve (2) is connected in series with the backwash water pipe (11) and is used to control the flow of backwash water. The outlet end of the backwash water pipe (11) extends to the internal cavity enclosed by the perforated plate grid (9). The pumping unit includes a pumping pipe (10) and a pumping flange interface (5). The inlet end of the pumping pipe (10) is located in the internal cavity and is used to pump out the filtered sewage. A check valve (4) is provided on the pumping pipe (10). When the electromagnetic pulse valve (2) is opened for backwashing, the internal pressure of the outer shell cavity (7) increases, and the one-way valve (6) closes under the action of pressure difference, forming a sealed space; when the electromagnetic pulse valve (2) is closed, the internal pressure of the outer shell cavity (7) decreases, and the one-way valve (6) opens to replenish air to balance the internal and external pressures.

2. The pulse backwashing mechanical bar screen device according to claim 1, characterized in that, The electromagnetic pulse valve (2) is connected to a constant pressure water supply pump. The constant pressure water supply pump and the electromagnetic pulse valve (2) are electrically connected to a control system (14). The control system (14) controls the start and stop of the constant pressure water supply pump and the pulse frequency of the electromagnetic pulse valve (2).

3. The pulse backwashing mechanical bar screen device according to claim 1, characterized in that, The perforated grid (9) is made of corrosion-resistant perforated mesh plate, and the side mesh plates on its three sides are connected in a C-shape and welded to the bottom mesh plate for sealing.

4. The pulse backwashing mechanical bar screen device according to claim 2, characterized in that, The control system (14) is a time interval controller or a PLC; the main body of the equipment also includes a differential pressure sensor (13), which is used to detect the liquid level difference inside and outside the orifice plate grid (9) and is electrically connected to the control system (14).

5. The pulse backwashing mechanical bar screen device according to claim 1, characterized in that, A filter (12) is also connected in series on the backwash water pipe (11), and the filter (12) is located at the water inlet end of the electromagnetic pulse valve (2).

6. The pulse backwashing mechanical bar screen device according to claim 1, characterized in that, The outer shell cavity (7) is provided with a liquid level observation window and a liquid level indicator line (8).

7. The pulse backwashing mechanical bar screen device according to claim 1, characterized in that, The main body of the equipment is a modular structure, and its backwash water flange interface (1) and pumping flange interface (5) are both standard flange interfaces.

8. The pulse backwashing mechanical bar screen device according to any one of claims 1 to 7, characterized in that, A slag hopper for collecting impurities can also be detachably connected to the lower part of the main body of the equipment.

9. The pulse backwashing mechanical bar screen device according to claim 1, characterized in that, The water pump is connected to the water pipe (10).

10. The pulse backwashing mechanical bar screen device according to claim 3, characterized in that, The outer shell cavity (7) is a pentahedron with an open bottom end, and the upper end of the perforated plate grid (9) is connected to the open bottom end. The main body of the equipment is installed on the front side of the mounting plate (200), and the rear ends of the side mesh plates and bottom mesh plates on the three sides of the periphery of the perforated plate grid (9) are all assembled with the front side of the mounting plate (200).

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