A mesh flocculation device with screw control to adjust mesh size

Abstract

The present invention is an adjustable mesh flocculation device that uses a screw control adjustment system to adjust the mesh size within a certain range. The adjustable mesh plate is composed of a plurality of movable transverse and longitudinal bars, and each group of adjustment systems is composed of two bars. The top seams of the bars are connected by hinges to form a certain opening angle, and a sliding wheel is installed on the end of the opening angle. The opening and closing degree of the angle between the two bars can be changed by adjusting the lifting and lowering of the screw through the screw and the screw closer, so that the area of ​​the mesh on the horizontal plane changes, thereby realizing the adjustment of the mesh size. The present invention adjusts the mesh size to adapt to the generation of a vortex flow field that meets the optimal collision conditions under different flow rates, avoiding the phenomenon that the flocs are broken due to the mesh being too small and the flow velocity being too large, or the vortex force is insufficient due to the mesh being too large and the flow velocity being too small, which is not conducive to flocculation.

Description

Technical Field

[0001] The invention belongs to the field of water treatment, and in particular relates to a mesh flocculation tank with a screw-controlled mesh size adjustable. Background Art

[0002] With the development of society, the requirements for drinking water quality are gradually increasing. Turbidity is one of the main references for drinking water quality. Turbidity is caused by colloids and suspended matter in water. By adding flocculants, colloids and suspended matter produce coagulation reactions, so that smaller suspended matter particles are condensed into larger particles, and then solid-liquid separation is performed to remove turbidity substances. Grid flocculation tanks, as a high-efficiency coagulation equipment, have been widely used in the field of water treatment. The grid flocculation tank is composed of a plurality of connected shafts, in which a multi-layer spoiler grid plate is installed. The grid width and hole size in the grid plate are fixed. When the water flows through the grid plate, a large number of vortices are generated due to the inertia of the water flow and the spoiler effect of the grid plate, forming a vortex field. The vortex field causes the suspended particles to collide with each other, which facilitates the formation of larger floc particles. However, if the water flow changes, the velocity gradient generated in the flow field behind the grid plate also changes accordingly, and the vortex state generated by the grid plate spoiler often cannot be optimized. The increase of flow rate will lead to excessive velocity behind the mesh of the grid plate, resulting in excessive shear force, causing flocs to break; the decrease of flow rate will lead to a decrease in the velocity gradient of the grid plate turbulence, and vortices that meet the collision conditions cannot be generated. Therefore, a new type of grid plate with a control system that adjusts the mesh size is needed to cope with the flow change: that is, at different flow rates, the vortex field generated behind the grid plate is always in the optimal vortex flocculation state. Summary of the invention

[0003] The purpose of the present invention is to solve the problem that when the flow rate changes, the existing grid flocculation tank cannot adjust the mesh size so that the vortex field generated behind the grid plate can achieve the optimal collision effect. Therefore, a grid flocculation device with a screw-controlled adjustable mesh size is invented: the influent water flow of the flocculation tank passes through the water distribution device and then flows up and down through the grid plate to generate a vortex effect. When dealing with a changing flow rate, if the flow rate increases, the orifice of the fixed mesh becomes relatively too small, and the shear stress generated by the flow field becomes larger, which will break the flocs; if the flow rate decreases, the orifice of the fixed mesh becomes relatively too large, and the shear stress generated by the flow field is insufficient, and a vortex flow field that meets the collision conditions cannot be generated.

[0004] To achieve the above purpose, the present invention includes the following technical solutions: the transverse bars and the longitudinal bars are formed by two gratings through a hinge to form a bar group with a changeable angle. The transverse bar group is connected by a transverse bar adjustment plate, and the longitudinal bar group is connected by a longitudinal bar adjustment plate. The opening angle of the bar group is adjusted and controlled by the rise or fall of the bar adjustment plate.

[0005] In the above device, in order to enable the bar adjustment plate to move up and down, vertical adjustment rods are vertically installed at both ends of each bar adjustment plate. By adjusting the screw opener and closeer, the screw is displaced in the vertical direction, and the bar adjustment plate is also displaced in the vertical direction. During the up and down movement of the bar adjustment plate, the pulley on the grid plate opening angle is driven to move horizontally in the slide rail, so that the grid plates connected by the hinges have different opening angles, thereby forming a grid plate with adjustable water mesh size.

[0006] In order to generate a lifting force on the thread of the device as described above, a screw opener corresponding to the thread is required to convert the torque generated during the rotation process into a driving force for pushing the adjusting rod up and down.

[0007] In order to adjust and fix the openings of each layer of mesh panels in the same position in the shaft, a grid support is required under the longitudinal grid to provide support without affecting the adjustment of the mesh openings.

[0008] In order for the device as described above to allow the bars to undergo corresponding interlocking changes when the adjusting plate is adjusted, each group of bars needs to be connected to the slide rail using a sliding wheel at the bottom of the bars.

[0009] In order to cope with the changing direction of water flow when the water flows up and down in the shaft, the device as described above has the opening angle direction of each group of grid plates in the shaft consistent with the direction of water flow.

[0010] The device as described above is designed with a mud discharge pipe and a venting device at the bottom of the shaft in order to discharge water during regular cleaning and maintenance of the shaft.

[0011] In order to prevent the device from being corroded in water and reduce secondary pollution of water by materials, the transverse bars, longitudinal bars and adjustment plates of the device as described above are made of polyethylene material, and the adjustment rod is made of stainless steel material. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the cross section of the grid flocculation tank.

[0013] Figure 2 Schematic diagram of the grid plate adjustment device.

[0014] Figure 3 It is an enlarged schematic diagram of the grid plate group.

[0015] Figure 4 It is a partial enlarged schematic diagram of the connection of the grid panel group.

[0016] Figure 5 It is a partial enlarged front view of the connection of the grid panel group.

[0017] Figure 6It is an enlarged schematic diagram of the local side of the connection of the grid panel group.

[0018] Figure 7 This is a side view of the flocculation tank.

[0019] Figure 1-Figure 7 The numerical symbols refer to the following names: water inlet pipe (1), water distribution tank (2), overflow weir (3), tank body (4), water inlet pipe valve (5), water outlet pipe valve (6), vent pipe (7), vent valve (8), water outlet pipe (9); adjustable grid plate group: transverse grid bar grid plate (10), longitudinal grid bar grid plate (11), bearing bracket with slide rail (12), grid plate connecting hinge (13), sliding wheel (14); adjustment device group: transverse grid bar adjustment plate (15), longitudinal grid bar adjustment plate (16), grid bar adjustment rod (17), adjustment screw (18), screw opener (19). DETAILED DESCRIPTION

[0020] The following is combined with Figure 1-7 , further explains the technical solutions in the embodiments of the present invention clearly and completely.

[0021] The vent pipe valve (7) is closed, and the water inlet pipe valve (5) and the water outlet pipe valve (6) are opened. Water flows from the water inlet pipe (1) into the water distribution tank (2) and flows into the first grid flocculation tank after being evenly distributed.

[0022] The water flows in the vertical shaft and generates a vortex field after passing through the adjustable grid plate group. The colloids and suspended particles in the water collide and aggregate and flocculate under the action of the vortex, and flocculate into large particle flocs (alum flowers).

[0023] In response to different water flow rates, the mesh holes on the grid plate are adjusted according to the size of the alum flower, and the screw shutter is manually or electrically adjusted so that the screw shutter acts on the thread on the adjusting screw (18), and the adjusting screw (18) is forced to produce vertical displacement. At the same time, the longitudinal and transverse bar adjustment rods (17), the transverse bar adjustment plate (15), and the longitudinal bar adjustment plate (16) fixed together with the adjusting screw (18) are linked to produce vertical displacement.

[0024] When the transverse bar adjustment plate (15) and the longitudinal bar adjustment plate (16) are affected by the linkage displacement, the synchronous force-bearing positions of the transverse bars and the longitudinal bars change, the inclinations of the transverse bar grid plates (10) and the longitudinal bar grid plates (11) change, the opening angles of the grid plate connection hinges (13) change, the sliding wheels (14) slide on the slide rails, and the mesh size formed by the adjustable grid plate group changes accordingly.

[0025] As the mesh size changes, the water flow cross-sectional area changes accordingly, and the vortex size and vortex intensity generated behind the mesh plate change accordingly, so that the mesh plate group can achieve the optimal shape requirements for the corresponding water flow and the flocculation reaction is in the best state.

[0026] Water flows from the bottom of the first vertical shaft into the second vertical shaft, and the water in the vertical shaft 2 flows from bottom to top. In the direction of the water flow, the opening angle direction of the connecting hinge (13) of the horizontal grid bar partition (10) and the longitudinal grid bar grid plate (11) changes, and the opening angle direction is consistent with the direction of the water flow. After crossing several vertical shafts in sequence, the water flows out from the outlet pipe (9).

Claims

1. A grid flocculation device with adjustable mesh size, characterized in that: It comprises a flocculation tank group, an adjustable grid plate group and an adjusting device group; the flocculation tank group comprises an inlet pipe (1), a water distribution tank (2), an overflow weir (3), a tank body (4), an inlet pipe valve (5), an outlet pipe valve (6), a vent pipe (7), a vent valve (8) and an outlet pipe (9); the adjustable grid plate group comprises a transverse grid bar grid plate (10), a longitudinal grid bar grid plate (11), a bearing bracket with a slide rail (12), a grid plate connecting hinge (13) and a sliding wheel (14); the adjusting device group comprises a transverse grid bar adjusting plate (15), a longitudinal grid bar adjusting plate (16), a grid bar adjusting rod (17), an adjusting screw (18) and a screw opening and closing device (19); The transverse grating plate (10) and the longitudinal grating plate (11) are clamped on the bearing bracket (12) with a slide rail through a sliding wheel (14), and are connected together by the sliding wheel (14) and the slide rail. The bearing bracket (12) with a slide rail is fixed to the pool wall. The transverse grating plate (10) and the longitudinal grating plate (11) are both composed of two grating plates, which are connected and spliced ​​together by a grating plate connecting hinge (13) to form a barrier with a certain opening angle. Two sliding wheels (14) are respectively installed at the ends of the opening angle edges. The sliding wheels (14) are connected to the bearing bracket (12) with a slide rail, so that the opening angle range can be adjusted between 90 degrees and 150 degrees. The bar adjustment rod (17) and the transverse bar adjustment plate (15), the longitudinal bar adjustment plate (16), the bar adjustment rod (17) and the adjustment screw (18) are welded and fixed to each other, and the whole is adjusted to move up and down, and the distance of the up and down movement is 0 to 10 cm; The adjusting screw (18) has threads, which are connected to the screw opener (19). The adjusting screw (18) with threads is displaced up and down by manually adjusting or electrically adjusting the screw opener (19); thereby driving the bar adjusting rod (17), the transverse bar adjusting plate (15) and the longitudinal bar adjusting plate (16) fixed to the adjusting screw (18) to move vertically in a coordinated manner; The sliding wheel (14) is installed at the lower part of the grid plate opening angle. Under the action of the displacement of the grid bar adjustment rod (17), the sliding wheel (14) slides, the hinge opening angles on the transverse grid bar grid plate (10) and the longitudinal grid bar grid plate (11) change, and the mesh size of the grid plate group changes, thereby adjusting the mesh size. Each group of adjustable grid plate groups is arranged in a vertical shaft, and the opening angle direction of each group of adjustable grid plate groups is consistent with the direction of water flow. Water flows from the bottom of the first vertical shaft into the second vertical shaft, and the water in the vertical shaft flows from bottom to top. The water flow direction is upward. At this time, the opening angle direction of the connecting hinge of the horizontal grid plate (10) and the longitudinal grid plate (11) changes, and the water flows over several vertical shafts in sequence and then is discharged from the outlet pipe (9).

2. A grid flocculation device with adjustable mesh size according to claim 1, characterized in that: The number of grid plate groups in the shaft is 3 to 10.

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