A filtering device for microplastics in seawater desalination

Abstract

The utility model relates to seawater salt making filter equipment technical field, concretely is a kind of filter removal device for microplastics in seawater salt making, including the shell body of top opening, the inner cylinder is arranged in the shell body, the inner cylinder bottom end is connected with the water outlet pipe extending to the outside of the shell body, the shell body bottom end is connected with the outlet, the outer ring chamber is arranged between the inner cylinder outside and the shell body, annular mouth is arranged in the inner cylinder middle part and is communicated with the outer ring chamber, the lower edge of the annular mouth is fixed with filter screen, the filter screen top end center is connected with the drive mechanism for the filter screen lifting work of installation in the shell body top end, the utility model realizes the purpose that microplastics are automatically filtered and cleaned in seawater salt making process, replaces the mode that traditional filter screen needs artificial periodic cleaning, reduces manual operation cost, improves the continuity and efficiency of seawater filtration.

Description

Technical Field

[0001] This utility model relates to the technical field of seawater salt production filtration equipment, specifically a filtration device for removing microplastics in seawater salt production. Background Technology

[0002] Microplastics refer to plastic particles and fibrous materials with a particle size of less than 5 mm. They include primary microplastics directly emitted from industry and secondary microplastics formed by the physical degradation and bio-erosion of large plastic products. As a typical carrier of persistent organic pollutants, they have strong environmental retention and bioaccumulation.

[0003] In the seawater salt production process, the sea salt mother liquor formed after seawater is evaporated and concentrated is the core raw material liquid for obtaining edible salt and industrial salt. If the microplastics remaining in the mother liquor are not effectively removed, it will directly lead to the microplastic content of the finished salt exceeding the standard. Therefore, achieving deep separation of microplastics from the original liquid in the sea salt mother liquor is a key process link to ensure the quality of sea salt products and meet the environmental protection standards of the salt production industry.

[0004] Among existing microplastic treatment technologies, screen filtration has become the mainstream technology for microplastic removal in seawater salt production due to its advantages such as low initial investment cost, simple operation process, and stable solid-liquid separation efficiency. However, this technology has significant limitations in practical industrial applications: On the one hand, in addition to microplastics, sea salt mother liquor also contains suspended impurities such as algal residues and silt particles. These substances and microplastics tend to co-accumulate on the filter screen surface, forming a dense filter cake layer, which leads to clogging of the filter screen pores, resulting in a sharp increase in filtration resistance and a decrease in mother liquor treatment throughput, thus affecting salt production efficiency. On the other hand, existing screen filtration systems require manual disassembly and periodic cleaning or replacement of the filter screen, which not only significantly increases the labor intensity of operators but also requires interruption of the continuous salt production process, resulting in poor equipment continuity and reduced sea salt yield per unit time, making it difficult to meet the needs of continuous industrial production in seawater salt production. Utility Model Content

[0005] The purpose of this invention is to provide a microplastic filtration device for seawater salt production, in order to solve the problems mentioned in the background art.

[0006] The technical solution of this utility model is: a filtration device for removing microplastics in seawater salt production, comprising an outer shell with an open top, an inner cylinder disposed inside the outer shell, a water outlet pipe extending to the outside of the outer shell connected to the bottom end of the inner cylinder, a debris outlet connected to the bottom end of the outer shell, an outer annular chamber disposed between the outer side of the inner cylinder and the outer shell, an annular opening communicating with the outer annular chamber disposed in the middle of the inner cylinder, a filter screen fixed at the lower edge of the annular opening, and a drive mechanism installed on the top of the outer shell and used for lifting the filter screen connected to the center of the top of the filter screen.

[0007] The aforementioned components achieve the following effects: Seawater to be filtered enters the filtration space formed by the outer shell and inner cylinder. As the seawater flows through the filter screen, the screen intercepts microplastics. The filtered seawater is discharged through the outlet pipe connected to the bottom of the inner cylinder. When a certain amount of microplastics accumulates on the filter screen, the drive mechanism is activated and applies an upward pulling force to the center of the top of the filter screen. This causes the flexible filter screen to tilt, with the center lifted and the edges fixed. As the filter screen is lifted at its center, the mesh gradually becomes smaller, even disappearing. This forces out the microplastics and other debris clogging the mesh, clearing the mesh and ensuring its smooth flow. The accumulated microplastics and other debris peel off from the mesh surface and enter the outer annular chamber between the inner cylinder and the outer shell through the annular opening in the middle of the inner cylinder. Finally, they are discharged from the outlet at the bottom of the outer shell. This achieves the automatic filtration and collection of microplastics during seawater salt production, replacing the traditional method of manually cleaning the filter screen periodically, reducing manual operation costs, and improving the continuity and efficiency of seawater filtration.

[0008] Preferably, the inner cylinder includes an upper cylinder and a lower cylinder connected to the inner wall of the outer shell. The upper cylinder and the lower cylinder are arranged vertically. The annular opening is located between the upper cylinder and the lower cylinder. The filter screen is installed on the top of the lower cylinder. A filter chamber is formed between the inner side of the upper cylinder and the top of the outer shell.

[0009] The effects achieved by the above components are as follows: the top of the lower cylinder provides stable installation support for the filter screen, ensuring the stability of the filter screen during filtration and lifting cleaning. The annular opening between the upper and lower cylinders precisely corresponds to the edge area of ​​the filter screen. When the filter screen is lifted and tilted, microplastics can slide directly from the edge of the filter screen into the annular opening and then into the outer ring chamber. This achieves precise division of the filtration space and optimization of the microplastic discharge path, avoiding seawater leakage and microplastic residue, and improving the sealing performance of the filtration and the thoroughness of microplastic cleaning.

[0010] Preferably, a connector that connects to the actuator of the drive mechanism is fixed at the center of the top of the filter screen.

[0011] The aforementioned components achieve the following effects: one end of the connector is fixed to the center of the top of the filter screen, and the other end is directly connected to the actuator of the drive mechanism, forming a bridge for power transmission; when the drive mechanism starts, the power from its actuator is precisely transmitted to the center of the filter screen through the connector, causing the center of the filter screen to be lifted stably. Because the connection point of the connector is located at the center of the filter screen, it ensures that the filter screen is subjected to uniform force, avoiding localized excessive stretching and damage. This achieves stable power transmission between the drive mechanism and the filter screen, preventing the filter screen from deforming or breaking due to uneven force, and improving the reliability of the device operation and the service life of the filter screen.

[0012] Preferably, the connector includes a hanging ring connected to the center of the filter screen and a hook connected to the actuating end of the drive mechanism.

[0013] The aforementioned components achieve the following effects: the connecting ring is fixed to the center of the filter screen, and the hook is connected to the actuator end of the drive mechanism, with the two using a detachable hooking method; during installation, simply hooking the hook into the connecting ring completes the connection between the drive mechanism and the filter screen; when the filter screen needs to be replaced or cleaned, the filter screen can be removed by directly separating the hook and connecting ring, realizing quick disassembly and assembly between the filter screen and the drive mechanism, simplifying the filter screen maintenance process, reducing maintenance time, and improving the maintenance convenience of the device.

[0014] Preferably, the drive mechanism includes a cylinder fixed at the center of the top of the outer casing, and the bottom end of the cylinder is connected to the hook.

[0015] The above components achieve the following effects: the cylinder is fixed at the center of the top of the outer shell, and its bottom output end is connected to the hook, which in turn connects to the filter screen; when the filter screen needs to be cleaned, the cylinder piston rod extends (or retracts) to drive the hook to move up and down, precisely controlling the lifting height and speed of the filter screen; the cylinder has stable power and responds quickly, and can promptly start the cleaning action according to the accumulation of microplastics on the filter screen.

[0016] Preferably, the drive mechanism further includes a winding rope connected to the hook, and a winding wheel connected to the winding rope is installed at the top of the outer casing. One end of the winding wheel is connected to a winding motor.

[0017] The above components achieve the following effects: the winding motor is installed on the top of the housing, and its output end is connected to the winding wheel. One end of the winding rope is wound around the winding wheel, and the other end is connected to the hook. When the cylinder malfunctions or the lifting method needs to be adjusted, the winding motor starts and drives the winding wheel to rotate. When the winding wheel winds up the winding rope, it lifts the hook and the filter screen.

[0018] Preferably, a counterweight is installed at the center of the bottom end of the filter screen.

[0019] The effects achieved by the above components are as follows: the counterweight is installed at the center of the bottom of the filter screen. During filtration, the counterweight pulls down the center of the filter screen under the action of gravity, making the filter screen concave and increasing the contact area between the filter screen and the seawater. When the drive mechanism lifts the filter screen, the counterweight can balance the force on the filter screen, preventing the filter screen from wrinkling or deforming locally due to excessive force on the top. This achieves the expansion of the filter screen's filtration area and the improvement of its structural stability, increases the amount of seawater filtered per unit time, and protects the filter screen from tensile damage, extending its service life.

[0020] Preferably, the filter screen is arranged in multiple layers with the mesh size increasing sequentially from top to bottom between the layers, and the mesh size of the filter screen is 325-600 mesh.

[0021] The effect achieved by the above components is as follows: through the spaced distribution of multiple layers of filter screens 1, the upper filter screen 1 uses a smaller mesh (e.g., 325 mesh) to first intercept larger microplastic particles in seawater; the lower filter screen 1 uses a larger mesh (e.g., 600 mesh) to further intercept smaller microplastic particles that were not filtered out in the upper layer, forming a graded filtration system of "coarse filtration-fine filtration"; the spaced arrangement can prevent the filter screens from sticking together, ensuring that seawater flows smoothly through each filter screen, realizing graded interception of microplastics, and avoiding the problem that single-layer fine mesh filter screens are easily blocked by large-diameter microplastic particles.

[0022] Preferably, the top of the outer casing is provided with a vibration seat and a vibration source for driving the vibration seat to generate vibration, and the top of the driving mechanism is mounted on the vibration seat.

[0023] The effects achieved by the above components are as follows: the vibrating seat is installed on the top of the outer shell, the vibration source drives the vibrating seat to vibrate, the top of the drive mechanism is fixed on the vibrating seat, and the vibration is transmitted to the hook through the drive mechanism, thereby causing the filter screen to shake synchronously; when the filter screen is lifted for cleaning, the shaking can cause stubborn microplastics attached to the inside or surface of the filter screen to fall off. Combined with the gravity of the microplastics sliding off, the filter screen is deeply cleaned, avoiding microplastics from clogging the mesh or remaining on the surface of the filter screen, ensuring that the filter screen mesh is unobstructed, maintaining stable filtration efficiency, and improving the thoroughness of the filter screen cleaning and the durability of the filtration performance.

[0024] This utility model provides an improved filtration device for removing microplastics in seawater salt production, which has the following improvements and advantages compared with the prior art:

[0025] When a certain amount of microplastics accumulates on the filter screen, the drive mechanism is activated and an upward pulling force is applied to the center of the top of the filter screen. This causes the flexible filter screen to tilt upward with the center lifted and the edges fixed. As the filter screen is lifted in its center, the mesh of the filter screen gradually becomes smaller and may even disappear. This squeezes out the microplastics and other debris that are clogging the mesh, thus clearing the mesh and ensuring that the mesh is unobstructed. The microplastics and other debris accumulated on the screen are peeled off from the screen surface and enter the outer ring chamber between the outer side of the inner cylinder and the outer shell through the annular opening in the middle of the inner cylinder. Finally, they are discharged from the outlet at the bottom of the outer shell. This invention achieves the purpose of automatic filtration, cleaning, and collection of microplastics in the seawater salt production process, replacing the traditional method of manually cleaning the filter screen periodically, reducing manual operation costs, and improving the continuity and efficiency of seawater filtration. Attached Figure Description

[0026] The present invention will be further explained below with reference to the accompanying drawings and embodiments:

[0027] Figure 1 This is a cross-sectional structural diagram of the present invention.

[0028] Explanation of reference numerals in the attached figures:

[0029] 1. Filter screen; 2. Connector; 3. Drive mechanism; 4. Filter chamber; 5. Outer ring chamber; 6. Annular opening; 7. Vibrating seat; 8. Counterweight; 9. Outer shell; 10. Inner cylinder; 101. Upper cylinder; 102. Lower cylinder. Detailed Implementation

[0030] The present invention will now be described in detail, and the technical solutions in the embodiments of the present invention will be clearly and completely described. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present invention.

[0031] This utility model provides an improved filtration device for removing microplastics in seawater salt production. The technical solution of this utility model is as follows:

[0032] In embodiments of this utility model, such as Figure 1 As shown, a filtration device for removing microplastics in seawater salt production includes an outer shell 9 with an open top, an inner cylinder 10 inside the outer shell 9, a water outlet pipe extending to the outside of the outer shell 9 connected to the bottom of the inner cylinder 10, a debris outlet connected to the bottom of the outer shell 9, an outer annular chamber 5 between the outer side of the inner cylinder 10 and the outer shell 9, and an annular opening 6 communicating with the outer annular chamber 5 in the middle of the inner cylinder 10. The inner cylinder 10 includes an upper cylinder 101 and a lower cylinder 102 connected to the inner wall of the outer shell 9, the upper cylinder 101 and the lower cylinder 102 are arranged vertically, the annular opening 6 is located between the upper cylinder 101 and the lower cylinder 102, a filter screen 1 is installed on the top of the lower cylinder 102, a filter chamber 4 is formed between the inner side of the upper cylinder 101 and the top of the outer shell 9, the filter screen 1 is fixed at the lower edge of the annular opening 6, and a drive mechanism 3 installed on the top of the outer shell 9 and used for lifting the filter screen 1 is connected to the center of the top of the filter screen 1.

[0033] In this embodiment of the present invention, a connector 2 is fixed at the center of the top of the filter screen 1 and connected to the execution end of the drive mechanism 3. One end of the connector 2 is fixed at the center of the top of the filter screen 1, and the other end is directly connected to the execution end of the drive mechanism 3, forming a bridge for power transmission. When the drive mechanism 3 is started, the power of its execution end is accurately transmitted to the center of the filter screen 1 through the connector 2, causing the center of the filter screen 1 to be lifted stably. The connector 2 includes a hanging ring connected to the center of the filter screen 1 and a hook connected to the execution end of the drive mechanism 3. The hanging ring of the connector 2 is fixed at the center of the filter screen 1, and the hook is connected to the execution end of the drive mechanism 3. The two are connected in a detachable manner. During installation, the connection between the drive mechanism 3 and the filter screen 1 can be completed simply by hooking the hook into the hanging ring. When the filter screen 1 needs to be replaced or cleaned, the filter screen 1 can be removed by directly separating the hook and the hanging ring, realizing quick disassembly and assembly between the filter screen 1 and the drive mechanism 3.

[0034] In this embodiment of the utility model, the drive mechanism 3 includes a cylinder fixed at the center of the top of the outer shell 9, the bottom of the cylinder being connected to a hook, and the drive mechanism 3 also includes a winding rope connected to the hook. A winding wheel connected to the winding rope is installed at the top of the outer shell 9, and a winding motor is driven to one end of the winding wheel. When a certain amount of microplastics accumulates on the filter screen 1 (affecting filtration efficiency), the drive mechanism 3 (which can be a cylinder, or an assembly including a winding wheel, rope, and motor) fixed at the top of the filter box is activated. The drive mechanism 3 is connected to the center of the filter screen 1 through the connecting piece 2 (such as a combination of a hook and a hanging ring), accurately transmitting power to the filter screen 1. The drive mechanism 3 drives the connecting piece 2 to move upward, causing the center of the filter screen 1 to lift (the filter screen 1 is a flexible mesh, and in which...). The counterweight 8 below the core can balance the force and prevent local deformation of the filter screen. At this time, the filter screen 1 is in an inclined state with "high center and low edge". Each layer of filter screen 1 moves up synchronously so that the microplastics and other debris intercepted by them are scattered into the outer ring chamber 5. Under the action of gravity, the intercepted microplastics slide along the surface of the filter screen to the edge and detach from the filter screen 1. The top of the outer shell 9 is provided with a vibration seat 7 and a vibration source for driving the vibration seat 7 to generate vibration. The top of the drive mechanism 3 is installed on the vibration seat 7. The vibration is transmitted to the hook through the drive mechanism 3, which in turn drives the filter screen 1 to shake synchronously. When the filter screen 1 is lifted for cleaning, the shaking can cause the stubborn microplastics attached to the mesh or surface of the filter screen 1 to fall off. Combined with the gravity of the microplastics sliding off, the deep cleaning of the filter screen 1 is achieved.

[0035] In this embodiment of the utility model, the filter screen 1 is arranged in multiple layers with spacing. The mesh size of the filter screen 1 increases sequentially from top to bottom. The mesh size of the filter screen 1 is 325-600 mesh. Several circumferentially distributed and vertically fixed support rods are provided inside the annular opening 6. The filter screen 1 has multiple layers with spacing between them. The mesh size of the filter screen 1 increases sequentially from top to bottom. The edge of each layer of filter screen 1 is fixed to each support rod. The center of each layer of filter screen 1 is connected together by a central support member. The central support member is connected to the connecting member 2 to achieve layer-by-layer filtration. During operation, when the driving mechanism 3 drives the connecting member 2 to move upward, each layer of filter screen 1 moves upward synchronously so that the microplastics and other impurities intercepted by it are uniformly scattered into the outer annular chamber 5.

[0036] The working principle of the microplastic removal device for seawater salt production provided by this utility model is as follows: Seawater introduction and filtration space positioning: The seawater to be filtered enters the filtration chamber 4 through the inlet at the top of the filter box, which is connected to the internal filtration chamber 4 of the inner cylinder 10 (including the upper cylinder 101 and the lower cylinder 102); at this time, the outer ring chamber 5 formed by the reserved gap between the outer shell 9 and the inner cylinder 10 is in the state of waiting to be collected, ensuring that the seawater is only processed in the filtration chamber 4 and avoiding the direct diversion of unfiltered seawater;

[0037] Seawater filtration and microplastic interception: Seawater entering the filtration chamber 4 flows downward through the filter screen 1 (mesh size 325-600 mesh, which can be multi-layered with increasing mesh size from top to bottom) located at the port of the lower cylinder 102. Because the outer edge of the filter screen 1 is fixed to the lower edge of the annular opening 6 between the upper and lower cylinders (101, 102), microplastics in the seawater are intercepted by the filter screen 1. The filtered clean seawater is discharged through the outlet pipe extending from the bottom of the inner cylinder 10 to the outside of the outer shell 9, thus completing the seawater purification.

[0038] Filter cleaning trigger and power transmission: When a certain amount of microplastics accumulates on the filter screen 1 (affecting filtration efficiency), the drive mechanism 3 (which can be a cylinder or an assembly containing a winding wheel, rope, and motor) fixed on the top of the filter box is activated; the drive mechanism 3 is connected to the center of the filter screen 1 through the connector 2 (such as a combination of hook and hanging ring) to accurately transmit power to the filter screen 1;

[0039] Filter screen stretching and microplastic shedding: The drive mechanism 3 drives the connecting piece 2 to move upward, which lifts the center part of the filter screen 1 (the filter screen 1 is a flexible mesh, and the counterweight 8 below its center can balance the force and prevent local deformation of the filter screen); at this time, the filter screen 1 is in an inclined state with "high center and low edge". Each layer of filter screen 1 moves upward synchronously, so that the microplastics and other debris intercepted by it are scattered into the outer ring chamber 5. Under the action of gravity, the intercepted microplastics slide along the surface of the filter screen to the edge and detach from the filter screen 1.

[0040] Microplastic collection and centralized discharge: Microplastics sliding along the edge of the filter screen 1 enter the outer ring chamber 5 through the annular opening 6 between the upper and lower cylinders (101, 102); finally, the microplastics are deposited to the bottom of the outer ring chamber 5 under the action of gravity, and are discharged in a concentrated manner through the impurity outlet that connects the bottom of the outer shell 9 to the outer ring chamber 5, thus completing the microplastic cleaning and collection.

[0041] Assisted cleaning and mesh unclogging (optional): If a stronger cleaning effect is required, the vibration source of the vibrating seat 7 on the top of the filter box can be activated; the vibration is transmitted to the filter screen 1 through the drive mechanism 3, causing the filter screen to shake and shake off the stubborn micro-plastics attached to the mesh; at the same time, the mesh shape changes during the stretching of the filter screen 1, which can squeeze out the debris clogging the mesh, ensuring that the mesh is unobstructed and maintaining stable filtration efficiency.

[0042] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A filtration device for removing microplastics in seawater salt production, comprising an outer shell (9) with an open top, characterized in that: An inner cylinder (10) is provided inside the outer shell (9). A water outlet pipe extending to the outside of the outer shell (9) is connected to the bottom end of the inner cylinder (10). An outlet for sludge is connected to the bottom end of the outer shell (9). An outer ring chamber (5) is provided between the outer side of the inner cylinder (10) and the outer shell (9). An annular opening (6) communicating with the outer ring chamber (5) is provided in the middle of the inner cylinder (10). A filter screen (1) is fixed at the lower edge of the annular opening (6). A drive mechanism (3) installed on the top of the outer shell (9) and used for lifting the filter screen (1) is connected to the center of the top of the filter screen (1).

2. The filtration device for removing microplastics in seawater salt production according to claim 1, characterized in that: The inner cylinder (10) includes an upper cylinder (101) and a lower cylinder (102) connected to the inner wall of the outer shell (9). The upper cylinder (101) and the lower cylinder (102) are arranged vertically. The annular opening (6) is located between the upper cylinder (101) and the lower cylinder (102). The filter screen (1) is installed on the top of the lower cylinder (102). A filter chamber (4) is formed between the inner side of the upper cylinder (101) and the top of the outer shell (9).

3. The filtration device for removing microplastics in seawater salt production according to claim 1, characterized in that: The filter screen (1) has a connector (2) fixed at the top center that is connected to the actuator of the drive mechanism (3).

4. A filtration device for removing microplastics in seawater salt production according to claim 3, characterized in that: The connector (2) includes a hanging ring connected to the center of the filter (1) and a hook connected to the actuating end of the drive mechanism (3).

5. A filtration device for removing microplastics in seawater salt production according to claim 4, characterized in that: The drive mechanism (3) includes a cylinder fixed at the center of the top of the outer shell (9), and the bottom end of the cylinder is connected to the hook.

6. A filtration device for removing microplastics in seawater brine production according to claim 5, characterized in that: The drive mechanism (3) also includes a winding rope connected to the hook, and a winding wheel connected to the winding rope is installed at the top of the outer shell (9), with a winding motor drivingly connected to one end of the winding wheel.

7. A filtration device for removing microplastics in seawater brine production according to claim 4, characterized in that: A counterweight (8) is installed at the center of the bottom end of the filter screen (1).

8. A filtration device for removing microplastics in seawater brine production according to claim 7, characterized in that: The filter (1) is arranged in multiple layers with intervals. The mesh size of the filter (1) increases sequentially from top to bottom between the layers. The mesh size of the filter (1) is 325-600 mesh.

9. A filtration device for removing microplastics in seawater brine production according to claim 1, characterized in that: The top of the outer shell (9) is provided with a vibration seat (7) and a vibration source for driving the vibration seat (7) to generate vibration, and the top of the driving mechanism (3) is mounted on the vibration seat (7).

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