Laminated filter and lamination thereof

Abstract

The invention provides a laminated filter and a laminated sheet thereof, and relates to the technical field of filtering devices.The laminated sheet comprises a laminated sheet body and filtering convex parts arranged on the first surface of the laminated sheet body, the filtering convex parts define water inlet flow channels and water outlet flow channels which are arranged in a staggered mode, and the water inlet flow channels and the water outlet flow channels are of a fishbone-shaped fractal structure and are alternately arranged in the circumferential direction; the water inlet flow channel comprises a T-shaped water inlet main flow channel with an outward opening and water inlet branch flow channels on the two sides, and the water outlet flow channel and the T-shaped water inlet main flow channel are opposite and complementary in structure; by means of the fishbone-shaped flow distribution and alternate arrangement design, the problems that a traditional linear flow channel is large in head loss, non-uniform in pollutant holding distribution and unstable in stacking structure are effectively solved through cooperation of the flow guide grooves in the second surface, and the excess flow is increased by more than four times compared with that of the traditional linear flow channel; the structure utilizes the deep space of the sub-runner to carry out pollutant holding, the flow field distribution is uniform, the pollutant holding amount is large, the anti-blocking capability is strong, the backwashing maintenance is easy, the structure is especially suitable for a large-flow water treatment scene, and the synchronous improvement of the filtering efficiency and the treatment capability is realized.

Description

Technical Field

[0001] This invention belongs to the field of filtration device technology, specifically relating to a disc filter and its discs. Background Technology

[0002] Disc filters are widely used in agricultural irrigation, industrial circulating water treatment, and other fields. Their core component is the filter disc. Traditional filter discs typically employ a single straight flow channel or a simple curved flow channel. However, straight or single curved flow channel discs have the following technical drawbacks: First, the head loss is large, especially under high flow conditions. Due to the simple flow channel structure, the local resistance is large and the energy consumption is high. Second, the traditional structure has a short flow path and low effective filtration area utilization, which leads to frequent backwashing and reduces the system's working efficiency. When the straight flow channel discs are stacked, due to the structural characteristics, the filter pore size formed by the upper and lower discs is greatly affected by randomness, resulting in fluctuations in filtration accuracy and structural instability. Summary of the Invention

[0003] To overcome the problems in the prior art, this invention develops a disc filter and its discs. Through an innovative fishbone-shaped fractal flow channel design, utilizing multi-stage flow diversion and a labyrinth structure, it significantly reduces head loss, increases the number of flow channels, significantly increases flow rate, and greatly improves dirt holding capacity and backwashing efficiency while ensuring filtration accuracy.

[0004] To achieve the above objectives, the present invention is implemented through the following technical solution: A disc filter includes a disc body, a filter protrusion, an inlet channel, an outlet channel, and a guide groove. The disc body is an annular disc and has opposing first and second surfaces. The filter protrusion is disposed on the first surface, and the filter protrusion extends radially and circumferentially along the laminate body, defining a plurality of mutually isolated and staggered inlet channels and outlet channels on the first surface. The water inlet channel is fishbone shaped and includes a T-shaped main water inlet channel arranged radially along the stacked body and opening towards the outside of the stacked body, and circumferential water inlet channels distributed on both sides of the radial main water inlet channel. The water outlet channel is fishbone shaped and includes a T-shaped main water outlet channel arranged radially along the stack body and opening towards the inner side of the stack body, and circumferential water outlet channels distributed on both sides of the main water outlet channel. The circumferential water inlet channel and the circumferential water outlet channel are separated by a filter protrusion; The guide grooves are evenly spaced and formed on the second surface of the stacked body.

[0005] Furthermore, the angle between the radial centerline of the main inlet channel and the radial centerline of the main outlet channel is angle A, which is 6°; the angle between the sidewalls of the main inlet channel is angle B, which is 2°; and the angle between the sidewalls of the main outlet channel is angle C, which is 2°.

[0006] Furthermore, the width of the inlet water distribution channel is 1mm, the width of the outlet water distribution channel is 1mm, and the thickness of the filter protrusion between the inlet water distribution channel and the outlet water distribution channel is 0.5mm.

[0007] Furthermore, the acute angle between the inlet water diversion channel and the main inlet water channel is angle D, and the angle of angle D ranges from 45° to 90°; the acute angle between the outlet water diversion channel and the main outlet water channel is angle E, and the angle of angle E is the same as the angle of angle D.

[0008] A disc filter comprising the above-described filter discs is formed by the interaction of a first surface and a second surface of adjacent disc bodies.

[0009] The beneficial effects of this invention are: 1. This invention solves the problem that when straight flow channel stacks are stacked, the randomness of the stacking due to structural issues leads to differences in the rhomboid flow channel regions formed when two stacked sheets are combined, resulting in structural instability. Due to the structural characteristics of both sides, when two stacked sheets are combined, the flow channel groove on one side fits into the dirt-collecting structure on the other side. The edges of the dirt-collecting structure surface have multiple support points against the edges of the flow channel groove, making the structure more stable when stacked and ensuring that there is no deviation in the size of the flow channel aperture.

[0010] 2. In this invention, the flow channel and the dirt-collecting tank work independently, while the straight flow channel both carries out flow and collects dirt, making it prone to clogging, which affects filtration efficiency. In addition, because the fluid can flow in multiple directions, this invention not only helps to reduce fluid resistance and energy consumption, but also allows the fluid to flow through other paths even if some discs are clogged, reducing the risk of overall clogging.

[0011] 3. The structure of this invention is easier to maintain. In the linear flow channel structure, since the wastewater is collected and the flow is all in the same channel, when particles block the flow channel but are not completely blocked, the flow channel diameter decreases. When water flows through the channel, the water pressure increases and the flow velocity increases. Since the outer diameter of the flow channel is larger than the inner diameter, the particles will be deeply squeezed into the inner flow channel until the particles are stuck and no longer move, which will cause the flow channel structure to deform. In this invention, due to the effect of gravity, the particles on the upper wastewater surface will fall off and then be discharged from the wastewater pipe with the backwash water flow, which is easy for subsequent cleaning treatment. Attached Figure Description

[0012] Figure 1This is a schematic diagram of the overall three-dimensional structure of the filter stack in Embodiment 1 of the present invention; Figure 2 This is a partial structural diagram of the second surface of the filter stack in Embodiment 1 of the present invention; Figure 3 This is an enlarged schematic diagram of a partial flow channel structure of the filter stack in Embodiment 1 of the present invention; Figure 4 This is a schematic diagram of the planar structure of the filter stack in Embodiment 1 of the present invention; Figure 5 This is a simulation cloud diagram of the velocity field distribution within the stacked flow channel in Embodiment 1 of the present invention; Figure 6 This is a simulation cloud diagram of the pressure field distribution within the stacked flow channel in Embodiment 1 of the present invention; Figure 7 This is a simulation cloud map of particle distribution (contamination) within the stacked flow channel in Embodiment 1 of the present invention; Figure 8 This is a schematic diagram of the stacked planar structure of Embodiment 2 of the present invention (arranged at a 60° angle). Figure 9 This is a schematic diagram of the stacked flow channel angle analysis in Embodiment 2 of the present invention; Figure 10 This is a diagram illustrating the optimization and simulation analysis of the flow channel structure in Embodiment 2 of the present invention. Figure 10 a is a partial structural diagram of Example 2 with a bottom water inlet channel. Figure 10 b is the velocity field contour map of Example 2. Figure 10 c is the pressure field contour map of Example 2. Figure 10 d is the streamline trace diagram of Example 2. Figure 10 e and Figure 10 f is a particle distribution diagram of Example 2.

[0013] Reference numerals: 1-Stacked body, 11-First surface, 12-Second surface, 2-Filter protrusion, 3-Inlet channel, 31-Main inlet channel, 32-Inlet branch channel, 4-Outlet channel, 41-Main outlet channel, 42-Outlet branch channel, 5-Guiding groove. Detailed Implementation

[0014] To make the objectives, technical solutions, and beneficial effects of the present invention clearer, the preferred embodiments of the present invention will be described in detail below to facilitate understanding by those skilled in the art. Example 1

[0015] like Figures 1 to 3As shown, a filter disc includes a ring-shaped disc body 1. A first surface 11 of the disc body 1 is provided with densely distributed filter protrusions 2. The filter protrusions 2 extend radially and circumferentially along the first surface 11, defining two sets of mutually isolated but interlocking inlet channels 3 and outlet channels 4. The channel structure is distributed in a "fishbone" pattern. The inlet channel 3 includes a radially extending main inlet channel 31 with its opening facing the outside of the stacked plates to allow raw water to pass through; on both sides of the main inlet channel 31, there are several inlet diversion channels 32, which serve as the main dirt-holding and filtration units. The structure of the outlet channel 4 is similar to that of the inlet channel but in the opposite direction, including the main outlet channel 41 with the opening facing inward and the outlet channels 42 on both sides. The inlet water distribution channel 32 and the outlet water distribution channel 42 are separated by the adjacent walls of the filter protrusion 2. The water flow must cross the filter protrusion 2 or pass through the micropores formed by the pressing of the stacked plates to enter the outlet water side from the inlet side, thereby achieving filtration.

[0016] like Figure 5 , Figure 6 As shown, to obtain optimal hydraulic performance and wastewater distribution, the structural parameters were optimized in the embodiment as follows: Channel dimensions: After simulation comparison of different spacings, the width of the inlet water distribution channel 32 and the outlet water distribution channel 42 is 1mm and the spacing is 0.5mm. Under this size, the flow field distribution is the most uniform, avoiding the penetration effect caused by excessive local flow velocity, while also ensuring sufficient flow area. Arrangement method: such as Figure 2 As shown, this invention adopts an alternating arrangement of "inlet main channel - outlet main channel", that is, in the circumferential direction, one inlet main channel 31 is adjacent to one outlet main channel 41. Simulation results show (see Figure 5 (Velocity cloud map), this alternating arrangement method has the least head loss and a more reasonable streamline distribution compared to other asymmetrical arrangements; The included angle between the radial centerline of the main inlet channel 31 and the radial centerline of the main outlet channel 41 is angle A, which is 6°. The arc length of angle A at the corresponding radius is the width of the inlet / outlet channel 32 and the outlet channel 42 at the corresponding radius. The included angle between the sidewalls of the main inlet channel 31 is angle B, which is 2°. The arc length of angle B at the corresponding radius is the width of the main inlet channel 31 at the corresponding radius. The included angle between the sidewalls of the main outlet channel 41 is angle C, which is 2°. The arc length of angle C at the corresponding radius is the width of the main outlet channel 41 at the corresponding radius. The acute angle between the inlet water diversion channel 32 and the main inlet water channel 31 is angle D, which is 90°; the acute angle between the outlet water diversion channel 42 and the main outlet water channel 41 is angle E, which is the same as the angle D.

[0017] Working principle and flow field analysis like Figure 5 As shown in the velocity field distribution cloud map, when the water flows into the stacked flow channel, the flow velocity reaches its highest point in the inlet and central area of ​​the main inlet channel 31 (bright area in the figure). Thanks to the alternating arrangement of the "main inlet channel - main outlet channel" in the circumferential direction, the water flow can be efficiently diverted from the main inlet channel 31 to the inlet diversion channels 32 on both sides. Combination Figure 6 (Pressure field distribution cloud map) It can be seen that after the water flows into the 90° vertically distributed inlet water diversion channel 32, the pressure shows a relatively uniform gradient decrease. Compared with the traditional straight flow channel, the fishbone fractal structure of this embodiment increases the tortuosity of the flow channel, forcing the water flow to make multiple turns in the streamline as it crosses the filter protrusion 2 from the inlet water diversion channel 32 into the outlet water diversion channel 42. This flow state makes the residence time of the fluid in the flow channel moderately increased, which is conducive to the separation of impurity particles from the water flow under the action of inertia and their retention in the inlet water diversion channel 32. It realizes the collection of dirt while passing through the flow, and the flow velocity distribution in each diversion channel is relatively balanced, avoiding premature blockage in some areas.

[0018] like Figure 7 The particle distribution simulation results show that the fishbone-shaped fractal channel of this embodiment has excellent dirt-holding capacity. When fluid containing impurities flows through the stacked discs, under the combined action of fluid drag and channel wall resistance, some impurity particles are successfully intercepted and locked in the internal area of ​​the inlet diversion channel 32 (shown as dense green dots in the figure). Specifically, particles tend to deposit in the end blind area and near the side walls of the inlet diversion channel 32, while the central area of ​​the main inlet channel 31 remains relatively clean, without obvious particle accumulation and blockage. This distribution characteristic proves that the fishbone-shaped diversion structure effectively utilizes the deep space of the lateral diversion channels to accommodate dirt, avoids premature accumulation of impurities at the inlet of the main channel, and has a relatively uniform dirt-holding distribution. Each diversion channel undertakes the interception task, thereby extending the backwashing cycle and service life of the filter.

[0019] In a straight-channel structure, where all contaminants and flow occur within the same channel, particle blockage, even incomplete blockage, leads to a reduction in channel orifice diameter. This increases water pressure and velocity as water flows through the channel. Because the outer orifice diameter is larger than the inner orifice diameter, particles are deeply compressed into the inner channel until they become stuck and immobile. This causes deformation of the channel structure. When manually flushing, particles stuck in a traditional straight-channel design are difficult to remove due to the impact and pressure of the water flow. Forcibly removing them during cleaning can cause secondary wear on the channel. The technical solution simply addresses this issue by... The particles remain inside the stacked discs, and the flow channel structure is not compressed or deformed. Cleaning can be completed simply by water flow impact. If an automatic backwashing device is used for rinsing, backwashing is automatically triggered when the inlet and outlet pressure difference reaches the set value. The filter element spring is released from the compressed state, which increases the gap between the stacked discs. Particles stuck in the straight flow channel require a large water flow impact force to flush out due to compression. In this invention, due to gravity, the particles on the upper dirt-collecting surface will fall off and then be discharged from the dirt-collecting pipe along with the backwash water flow, which is convenient for subsequent cleaning treatment. The annular arrangement of the dirt-holding structure of this invention, when combined with the second surface, increases the number of flow channels by four times compared to a linear stacked disc with the same filtration accuracy, significantly improving the flow rate. When the same flow rate of water is passed through, fewer devices need to be installed, saving space while ensuring filtration efficiency. The effect is even more significant when filtering large flow rates of water.

[0020] Head loss comparison test Using a conventional single radial straight-channel laminate with the same flow area as in Example 1, a head loss comparison test was conducted under clear water conditions. The head loss comparison results are shown in Table 1. Table 1 Comparison of head loss under clear water conditions (m)

[0021] Results Analysis The alternating fishbone structure used in this embodiment is superior to the traditional single straight-line flow channel stack in terms of head loss control.

[0022] First, under the same flow area, the alternating arrangement of the present invention (such as...) Figure 2 This maximizes the utilization rate of the effective area of ​​the stacked plates. According to the simulation results, the distribution of water flow in the mainstream area is more reasonable, reducing the ineffective dead water area, thereby reducing the additional energy consumption caused by intense local turbulence. Secondly, although the flow channel adopts a tortuous fishbone-shaped structure, the water inlet main channel 31 and the water outlet main channel 41 are adjacent and alternately set, resulting in a short and clear water infiltration path. Compared with the phenomenon of water pressure rising sharply due to the reduction of flow channel aperture after blockage in traditional structures, this structure allows for multi-path parallel flow, that is, the fluid can be filtered and infiltrated from any unblocked branch channel node. This multi-directional flow characteristic effectively alleviates the increase in overall head loss caused by local blockage and ensures the stability of pressure difference of the filter over a long operating cycle. Example 2

[0023] like Figure 8 , Figure 9 As shown, the difference between this embodiment and Embodiment 1 is that the included angles D and E are 60°; like Figure 10 Simulation results As shown in Figure a, after the water flows into the mainstream area in Example 2, the inlet channel groove is distributed first, and preliminary filtration is achieved in area ① on the figure, where a large number of particles are initially intercepted at position ①. As shown in Figures e and f, unintercepted particles flow into the inner ring of the stack and are distributed relatively evenly in the sludge collection tank. Figure b is a streamline diagram. As can be seen from the figure, the flow velocity is the largest in the central area of ​​the main flow zone after the water flows in. The flow velocity in the inner circle of the channel is greater than that in the outer circle. From the inside to the outside, the flow velocity in the two sludge receiving channels decreases sequentially. As shown in the trace diagram in Figure d, when the water first flows in, the sludge-collecting tanks on both sides form a vortex, which draws the particles into the outer tank, explaining the state distribution of particles e and f. In addition, to further optimize the filtration efficiency, structural optimization revealed that the inlet channels at the bottom of the tanks on both sides have better filtration and backwashing effects, as shown in area ② of Figure a. When the blockage is not severe, the water flow is more easily filtered in the lower channel due to gravity. As the blockage worsens, the blockage in the lower channel reduces the flow rate, and the upper channel takes on the main filtration role. The filtration effect can be improved by filtration simultaneously on both sides. Example 3

[0024] A disc filter comprising the filter discs described in Embodiment 1 or Embodiment 2 above includes a housing, a filter element frame disposed within the housing, a pressing device, and a filter assembly sleeved on the filter element frame; The filter assembly is composed of several stacked bodies 1 as described in Embodiment 1 or Embodiment 2, which are stacked along the axial direction. Between two adjacent stacked bodies 1, the first surface 11 of the upper stacked body (i.e. the side with the fishbone-shaped filter protrusion 2) is in close contact with the second surface 12 of the lower stacked body (i.e. the side with the guide groove 5). In the filtration state, the filter assembly is axially pressed by a clamping device such as a spring or hydraulic piston, forming a sealed filtration channel between adjacent discs. When the two discs are pressed together, the guide grooves 5 on the second surface 12 (see...) Figure 2 The guide grooves 5 cover the inlet channel 3 and outlet channel 4 of the first surface 11. Since the guide grooves 5 are evenly opened in the radial direction, they form a multi-point cross support with the tortuous filter protrusions 2 on the first surface 11. This edge-to-edge support method not only ensures the structural stability after the stacked plates are stacked and prevents the channel from deforming due to excessive water pressure, but also forms a microscopic three-dimensional filter grid. The presence of the guide grooves 5 helps to guide the water flow to enter the various branch channels of the fishbone-shaped channel more evenly, avoiding the local dead water area that may be caused by the flat plate cover.

[0025] The water flow path is as follows: Inlet flow channel: Raw water enters from the outer edge of the stacked body 1 and first flows into the T-shaped inlet main channel 31 with the opening facing outward; Diversion and filtration: The water flows inward along the main inlet channel 31 and is diverted to the circumferential inlet diversion channels 32 on both sides; at this time, the water flow is restricted within the inlet diversion channels 32 and must cross the tiny gap between the top of the filter protrusion 2 and the second surface 12 of the adjacent stack, or pass through the filter channel formed by the guide groove 5, before entering the adjacent outlet diversion channel 42; during this process, impurity particles are intercepted within the inlet diversion channels 32; Collection and output: The filtered clean water enters the outlet diversion channel 42 and is collected into the T-shaped outlet main channel 41.

[0026] Discharge: Since the main outlet channel 41 opens towards the inside of the disc body 1, the purified water eventually flows into the central channel formed by the inner ring of the disc and is discharged from the outlet of the filter.

[0027] Backwash In backwash mode, the clamping device is released, and a gap appears between the stacked discs 1. The backwash water is sprayed from the inner ring to the outer ring. Using centrifugal force and water flow tangential force, the intercepted impurities are flushed out of the stacked discs. With the guiding effect of the guide groove 5 on the second surface 12, the impurities are more easily detached and discharged from the shell.

[0028] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made to it in form and detail without departing from the scope defined by the claims of the present invention.

Claims

1. A stacked disc filter, characterized in that, It includes a stacked plate body (1), a filter protrusion (2), an inlet channel (3), an outlet channel (4), and a guide groove (5). The stacked plate body (1) is a ring-shaped plate and has a first surface (11) and a second surface (12) opposite to each other. The filter protrusion (2) is disposed on the first surface (11). The filter protrusion (2) extends radially and circumferentially along the stacked body (1) and defines a plurality of mutually isolated and staggered water inlet channels (3) and water outlet channels (4) on the first surface (11). The water inlet channel (3) is fishbone shaped. The water inlet channel (3) includes a T-shaped main water inlet channel (31) arranged radially along the stacked body (1) and opening towards the outside of the stacked body (1), and circumferential water inlet channels (32) distributed on both sides of the radial main water inlet channel (31). The water outlet channel (4) is fishbone shaped. The water outlet channel (4) includes a T-shaped main water outlet channel (41) arranged radially along the stacked body (1) and opening towards the inside of the stacked body (1), and circumferential water outlet channels (42) distributed on both sides of the main water outlet channel (41). The circumferential water inlet channel (32) and the circumferential water outlet channel (42) are separated by a filter protrusion (2); The guide grooves (5) are evenly spaced on the second surface (12) of the stacked body (1).

2. The stacked disc filter according to claim 1, characterized in that, The included angle between the radial centerline of the main inlet channel (31) and the radial centerline of the main outlet channel (41) is included angle A, which is 6°; the included angle between the sidewalls of the main inlet channel (31) is included angle B, which is 2°; and the included angle between the sidewalls of the main outlet channel (41) is included angle C, which is 2°.

3. The stacked disc filter according to claim 1, characterized in that, The width of the inlet water channel (32) is 1 mm, the width of the outlet water channel (42) is 1 mm, and the thickness of the filter protrusion (2) between the inlet water channel (32) and the outlet water channel (42) is 0.5 mm.

4. The stacked disc filter according to claim 1, characterized in that, The acute angle between the inlet water diversion channel (32) and the main inlet water channel (31) is angle D, and the angle range of angle D is 45°-90°; the acute angle between the outlet water diversion channel (42) and the main outlet water channel (41) is angle E, and the angle of angle E is the same as the angle of angle D.

5. The stacked disc filter according to claim 1, characterized in that, The guide groove (5) is uniformly opened radially on the second surface (12) of the stacked body (1).

6. A disc filter comprising the discs as described in any one of claims 1 to 5, characterized in that, The filter assembly is formed by the interaction of the first surface (11) and the second surface (12) of several adjacent stacked disc bodies (1).

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