Aqueous varnish gradient filtration system

Abstract

A water-based gloss gradient filtration system comprises a box body and a filter plate arranged in the box body. The filter plate is sequentially provided with a large-hole filtering area, an elliptical-hole filtering area and a small-hole filtering area along the gloss flow direction, forming a three-stage gradient filtering unit. The funnel-shaped through hole of the large-hole filtering area can guide and intercept large-particle impurities; the spiral flow guide structure of the elliptical-hole filtering area utilizes the velocity difference between the major axis and the minor axis to generate shear force, capturing medium-sized particles; and the closely arranged through holes of the small-hole filtering area can intercept small-particle impurities. The surface of each filtering area is further provided with an array of convex points, the size and distribution density of which gradually change according to the size of the through holes, further optimizing the filtering effect. The three-stage gradient filtration effectively avoids the instantaneous blockage problem that is prone to occur in single-stage filtration, improves the filtering efficiency, ensures the high purity of the gloss, prolongs the service life of the filtration system and reduces the maintenance cost.

Description

Technical Field

[0001] This utility model particularly relates to a water-based varnish gradient filtration system. Background Technology

[0002] Water-based varnishes are widely used in the printing and coating industries as environmentally friendly coatings. However, during production, storage, and use, water-based varnishes are prone to contamination with solid impurities of varying particle sizes, including large agglomerates (>100μm), medium-sized additives (50-100μm), and small particulate contaminants (20-50μm). These impurities can severely affect the film-forming quality and application performance of the varnish.

[0003] The main technical problems with commonly used filtration devices on the market are as follows:

[0004] Low efficiency of single-stage filtration: Traditional filter plates use a uniform pore size design, which cannot effectively intercept impurities of different particle sizes at the same time, resulting in incomplete filtration or frequent clogging.

[0005] Inconsistent grading filtration: Existing grading filtration equipment lacks fluid dynamic connection between each stage, causing particulate matter to deposit in the transition area. Utility Model Content

[0006] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a water-based varnish gradient filtration system.

[0007] To solve the aforementioned technical problems, this utility model adopts the following technical solution:

[0008] A water-based varnish gradient filtration system includes a housing and a filter plate disposed within the housing. The filter plate is equipped with a gradient filtration unit, which includes: a large-pore filtration zone, an elliptical-pore filtration zone, and a small-pore filtration zone arranged sequentially along the varnish flow direction on the filter plate. The pore diameter of each filtration zone decreases progressively along the flow direction. The large-pore filtration zone has funnel-shaped pores to guide large particles into the center of the pores. The inner wall of the elliptical-pore filtration zone has a spiral flow guiding structure. The small-pore filtration zone has closely spaced pores. The surface of the filter area is provided with an array of protrusions, wherein: the protrusions in the large-pore filter area are arranged circumferentially around each through hole; the protrusions in the elliptical-pore filter area are located at both ends of the long axis of the through hole; the protrusions in the small-pore filter area are evenly distributed; the size and distribution density of the protrusions gradually change with the size of the through hole in the corresponding filter area; the funnel-shaped through hole in the large-pore filter area cooperates with the surrounding protrusions to form a large particle pre-filtration channel; the spiral flow guiding structure in the elliptical-pore filter area cooperates with the axial protrusions to form a medium particle swirling filter channel; and the closely arranged through holes and protrusions in the small-pore filter area cooperate to form a small particle filter channel.

[0009] Preferably, it further includes a graded flow diversion system, the graded flow diversion system comprising:

[0010] The filtrate transfer device is located below the filter plate;

[0011] A filtrate collector, wherein a guide pipe is connected between the filtrate transition device and the filtrate collector.

[0012] Preferably, the filtrate transfer device has a three-layer structure stacked vertically:

[0013] The upper diffuser plate has evenly distributed strip-shaped through holes;

[0014] The middle layer of buffer mesh is made of 80-100 mesh stainless steel plain weave mesh;

[0015] The lower guide plate has one end of the guide tube connected to the lower guide plate and the other end connected to the filtrate collector.

[0016] Preferably, the filter plate is provided with guide baffle structures on both sides along the flow direction of the varnish, which are used to guide the varnish sequentially to the large-pore filtration zone, the elliptical-pore filtration zone and the small-pore filtration zone.

[0017] Preferably, the pore size of the large-pore filter zone is 1.2-1.5 times that of the elliptical-pore filter zone, and the pore size of the small-pore filter zone is 0.6-0.8 times that of the elliptical-pore filter zone.

[0018] The beneficial effects of this utility model are:

[0019] This invention achieves three-stage gradient filtration by incorporating a gradient filtration unit, avoiding the instantaneous clogging problem of single-stage filtration and improving filtration efficiency and effect. The funnel-shaped through-holes in the large-pore filtration zone guide large particles into the center of the channel and intercept them; the spiral flow guiding structure in the elliptical-pore filtration zone causes the varnish to move in a spiral motion, capturing particles with the shear force generated by the difference in flow velocity between the long and short axes; and the tightly arranged through-holes in the small-pore filtration zone trap small particulate impurities. The entire three-stage gradient filtration structure progressively removes impurity particles of different sizes, ensuring high purity of the varnish. Attached Figure Description

[0020] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0021] Figure 1 This is a schematic diagram of the structure of a water-based varnish gradient filtration system according to this application. Figure 1 ;

[0022] Figure 2 This is a schematic diagram of the structure of a water-based varnish gradient filtration system according to this application. Figure 2 . Detailed Implementation

[0023] The embodiments of this utility model are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout.

[0024] The orientation shown in the accompanying drawings should not be construed as limiting the specific protection scope of this utility model, but is only for reference and understanding of preferred embodiments. The product components shown in the drawings can be changed in position, increased in number, or simplified in structure.

[0025] The “connection” described in the specification and the “connection” relationship between the components shown in the accompanying drawings can be understood as a fixed connection, a detachable connection, or a connection that forms an integral unit; it can be a direct connection or a connection through an intermediate medium. Those skilled in the art can understand the connection relationship according to the specific circumstances and can derive different implementation methods such as screwing, riveting, soldering, snap-fitting, or embedding to suitably replace it.

[0026] The directional terms such as up, down, left, right, top, and bottom mentioned in the instruction manual and the directions shown in the attached drawings indicate that the components can directly contact each other or contact each other through other features; for example, "up" can mean directly above or diagonally above, or it simply means above other objects; other directions can be understood by analogy.

[0027] The materials used to manufacture solid-shaped parts as shown in the specification and drawings may be metallic, non-metallic, or other synthetic materials. The machining processes used for solid-shaped parts may include stamping, forging, casting, wire cutting, laser cutting, injection molding, CNC milling, 3D printing, machining, etc. Those skilled in the art may adapt or combine the above materials and manufacturing processes according to different processing conditions, costs, and precision requirements.

[0028] A water-based varnish gradient filtration system includes a housing 1 and a filter plate 2 disposed within the housing 1. The filter plate 2 is equipped with a gradient filtration unit, which includes: a large-pore filtration zone 3, an elliptical-pore filtration zone 4, and a small-pore filtration zone 5 sequentially arranged on the filter plate 2 along the varnish flow direction. The aperture of the pores in each filtration zone decreases progressively along the flow direction. The pores in the large-pore filtration zone 3 are funnel-shaped, used to guide large particles into the center of the pores. The inner wall of the pores in the elliptical-pore filtration zone 4 is provided with a spiral flow guiding structure 1-1. The pores in the small-pore filtration zone 5 are closely arranged. The surface of each filtration zone... The surface is provided with an array of protrusions 6, wherein: the protrusions 6 of the large-pore filter zone 3 are arranged circumferentially around each through hole; the protrusions 6 of the elliptical-pore filter zone 4 are located at both ends of the long axis of the through hole; the protrusions 6 of the small-pore filter zone 5 are evenly distributed; the size and distribution density of the protrusions 6 gradually change with the size of the through hole of the corresponding filter zone; the funnel-shaped through hole of the large-pore filter zone 3 cooperates with the surrounding protrusions 6 to form a large particle pre-filtration channel; the spiral flow guiding structure 1-1 of the elliptical-pore filter zone 4 cooperates with the axial protrusions 6 to form a medium particle swirling filter channel; the closely arranged through holes of the small-pore filter zone 5 cooperate with the uniform protrusions 6 to form a small particle filter channel.

[0029] Furthermore, it also includes a graded flow diversion system, the graded flow diversion system comprising:

[0030] The filtrate transfer device 7 is located below the filter plate 2;

[0031] The filtrate collector 8 is connected to the filtrate transition device 7 by a guide pipe 9.

[0032] Furthermore, the filtrate transfer device 7 is provided with a three-layer structure stacked vertically:

[0033] The upper diffuser plate 10 is provided with uniformly distributed strip-shaped through holes;

[0034] The middle buffer mesh 11 is an 80-100 mesh stainless steel plain weave mesh;

[0035] The lower guide plate 12 has one end of the guide pipe 9 connected to the lower guide plate 12 and the other end connected to the filtrate collector 8.

[0036] Furthermore, the filter plate 2 is provided with flow guide baffle structures 13 on both sides along the flow direction of the varnish, which are used to guide the varnish sequentially to the large-pore filter zone 3, the elliptical-pore filter zone 4 and the small-pore filter zone 5.

[0037] Furthermore, the pore diameter of the large-pore filter zone 3 is 1.2-1.5 times that of the pore diameter of the elliptical-pore filter zone 4, and the pore diameter of the small-pore filter zone 5 is 0.6-0.8 times that of the pore diameter of the elliptical-pore filter zone 4.

[0038] The working principle of this utility model is as follows:

[0039] Example:

[0040] like Figure 1-2 As shown, a water-based varnish gradient filtration system includes a housing 1 and a filter plate 2 disposed inside the housing 1, wherein a gradient filtration unit is disposed on the filter plate 2.

[0041] The gradient filtration unit includes a large-pore filtration zone 3, an elliptical-pore filtration zone 4, and a small-pore filtration zone 5 arranged sequentially along the flow direction of the varnish. The aperture of the through holes in each filtration zone decreases progressively along the flow direction.

[0042] The design concept of this application is explained in detail below with specific pore sizes and particle agglomerates, but this does not mean that only structures with the following dimensions can realize the technical solution of this application.

[0043] The through holes of the macroporous filtration zone 3 are funnel-shaped, with a diameter ranging from 2.0 to 2.5 mm. They are used to guide large particles into the center of the through holes of the macroporous filtration zone 3 and intercept particle agglomerates >100 μm. The upper layer fluid of the varnish directly passes through the pores into the elliptical pore filtration zone 4. Large particle agglomerates are adsorbed and retained on the inner wall of the pores due to the 45° chamfer.

[0044] The inner wall of the through-hole of the elliptical pore filtration zone 4 is provided with a spiral flow guiding structure 1-1. The major axis of the through-hole ranges from 1.5 to 2.0 mm, and the minor axis ranges from 1.5 to 2.0 mm. The flow velocity in the major axis direction is fast, at 0.15 m / s, while the flow velocity in the minor axis direction is slow, at 0.05 m / s. The spiral flow guiding structure 1-1 forces the particles to undergo centrifugal sedimentation. When the varnish flows through the elliptical pore, shear force is generated due to the difference in flow velocity between the major and minor axes (approximately 3:1). The spiral flow guiding structure 1-1 converts the linear flow into spiral motion (swirling velocity 0.3-0.5 m / s). The particles migrate towards the pore wall under the action of centrifugal force, capturing medium-sized particle agglomerates of 50-100 μm.

[0045] The through holes in the small pore filtration zone 5 are arranged in a close arrangement, with a pore diameter ranging from 1.0 to 1.2 mm, and are used to trap 20-50 μm impurities, i.e. small particulate impurities.

[0046] Each filtration zone has a raised dot array on its surface. In the large-pore filtration zone 3, the raised dots 6 are arranged circumferentially around each through-hole; in the elliptical-pore filtration zone 4, the raised dots 6 are located at both ends of the long axis of the through-hole; and in the small-pore filtration zone 5, the raised dots 6 are evenly distributed. The size and density of the raised dots gradually change with the through-hole size of the corresponding filtration zone. The funnel-shaped through-holes of the large-pore filtration zone 3, in conjunction with the surrounding raised dots 6, form a pre-filtration channel for large particles; the spiral guide structure 1-1 of the elliptical-pore filtration zone 4, in conjunction with the axial raised dots 6, forms a swirling filtration channel for medium particles; and the tightly arranged through-holes of the small-pore filtration zone 5, in conjunction with the uniform raised dots 6, form a filtration channel for small particles. The 45° chamfer on the inner wall of the funnel-shaped through-holes in the large-pore filtration zone 3 generates vortices, causing large particles to complete the three stages of "deceleration-deflection-deposition" within the channel, with the sediment mainly accumulating in the lower half of the channel. The height of the bump is 0.5 mm, which is greater than the thickness of the water-based varnish boundary layer (0.1-0.3 mm). This causes the fluid to generate micro-vortices (vortex diameter of about 2 mm) at the top of the bump. Actual measurement data shows that it can reduce gel adhesion by 35%. When the varnish carries impurities, large particles will "slip" when they hit the bump. The slope of the bump will "bounce" the particles toward the pores of the nearest macroporous filter zone 3. Medium and small particles slip away through the gaps between the bumps. This allows large particles to complete the three stages of "deceleration-turning-deposition" in the channel. The deposits mainly accumulate in the lower half of the channel.

[0047] This invention also includes a graded flow guiding system, which is mainly designed for the recycling of filter residue. The graded flow guiding system includes a filtrate transition device 7 and a filtrate collector 8, which are connected by a flow guiding pipe 9. After the varnish is filtered by the gradient filtration unit, the resulting filter residue enters the filtrate transition device 7 and is processed by the graded flow guiding system to achieve the classified collection and recycling of the filter residue.

[0048] Specifically, the filtrate transfer device 7 has a three-layer structure stacked on top of each other:

[0049] Upper diffuser plate 10: The strip-shaped through holes evenly distributed on it can perform preliminary screening and dispersion of the filter residue entering the filtrate transition device 7, so that the filter residue is evenly distributed, preventing excessive accumulation or blockage of subsequent structures. At the same time, it can initially intercept larger particles in the filter residue, creating favorable conditions for subsequent fine separation.

[0050] Middle layer buffer mesh 11: Made of 80-100 mesh stainless steel plain weave mesh, it can further intercept filter cake particles with a diameter greater than 80μm. The intercepted filter cake can be collected separately for subsequent targeted recycling based on different particle sizes.

[0051] Lower guide plate 12: Used to receive the filter cake after filtration. After being screened by the upper diffuser plate 10 and the middle buffer mesh 11, the filter cake is further accumulated on the lower guide plate 12, and then enters the filtrate collector 7 through the guide pipe 9.

[0052] The graded flow system uses these three layers to grade the filter cake, enabling the effective separation and collection of filter cakes of different particle sizes, which facilitates subsequent targeted recycling.

[0053] The filter plate 2 is provided with guide baffles 13 on both sides along the flow direction of the varnish, which are used to guide the varnish sequentially to the large hole filter zone 3, the elliptical hole filter zone 4 and the small hole filter zone 5.

[0054] In this invention, the filter plate 2 is provided with flow guide baffles 13 on both sides along the flow direction of the varnish. The flow guide baffles 13 play a crucial role in guiding the flow, ensuring that the varnish can flow into the large-pore filtration zone 3, the elliptical-pore filtration zone 4 and the small-pore filtration zone 5 in a precise and orderly manner, thus maintaining the smoothness and efficiency of the entire filtration process.

[0055] The filter plate 2 can be installed at an angle within the housing 1. This angled arrangement cleverly utilizes gravity; when the varnish is injected into the housing, it flows downwards along the angled surface of the filter plate 2 under the influence of gravity. The guide baffles 13 are located on both sides of the filter plate, acting as guide rails for the varnish flow, directing it sequentially to each filtration zone.

[0056] When the varnish first enters the large-pore filter zone 3, the large-pore filter zone 3, with its unique large-pore structure, efficiently intercepts large particulate impurities, allowing the varnish to be initially purified. After filtration, the varnish flows into the elliptical-pore filter zone 4 under the dual guidance of the inclined filter plate and the flow guide baffle 13.

[0057] Finally, the varnish, after two rounds of filtration, continues along the direction indicated by the inclined filter plate and the guide baffle 13 to the small-hole filtration zone 5. The closely spaced holes in the small-hole filtration zone remove all fine impurities, ensuring that the flowing varnish is clear and pure, and is finally collected.

[0058] In practical applications, the varnish is introduced through the inlet of the oil tank and first enters the large-pore filtration zone. Large particles are adsorbed and retained due to the 45° chamfer on the inner wall of the pores, completing the pre-filtration of large particles. Subsequently, the varnish flows into the elliptical-pore filtration zone. The spiral flow-guiding structure 1-1 of the elliptical pores causes the varnish to move in a spiral motion, forcing medium-sized particles to settle centrifugally and migrate towards the pore wall, completing the filtration of medium-sized particles. Finally, the varnish enters the small-pore filtration zone. The tightly arranged through-holes in the small-pore filtration zone trap 20-50μm impurities, completing the filtration of medium-sized particles and ensuring the purity of the varnish.

[0059] This invention achieves three-stage gradient filtration by incorporating a gradient filtration unit, avoiding the instantaneous clogging problem of single-stage filtration and improving filtration efficiency and effect. The funnel-shaped through-holes in the large-pore filtration zone guide large particles into the center of the channel and intercept them; the spiral flow guiding structure in the elliptical-pore filtration zone causes the varnish to move in a spiral motion, capturing particles with the shear force generated by the difference in flow velocity between the long and short axes; and the tightly arranged through-holes in the small-pore filtration zone trap small particulate impurities. The entire three-stage gradient filtration structure progressively removes impurity particles of different sizes, ensuring high purity of the varnish.

[0060] Although the present invention has been described in detail with reference to the above embodiments, it will be apparent to those skilled in the art that various changes or modifications can be made to the present invention without departing from the principles and spirit of the present invention as defined by the claims. Therefore, the detailed description of the embodiments in this disclosure is for explanation only and not for limiting the present invention, but rather the scope of protection is defined by the content of the claims.

Claims

1. A water-based varnish gradient filtration system, characterized in that, The system includes a housing (1) and a filter plate (2) disposed within the housing (1). The filter plate (2) is equipped with a gradient filtration unit, which includes a large-pore filtration zone (3), an elliptical-pore filtration zone (4), and a small-pore filtration zone (5) arranged sequentially on the filter plate (2) along the flow direction of the varnish. The aperture of the through holes in each filtration zone decreases progressively along the flow direction. The through holes of the large-pore filtration zone (3) are funnel-shaped, used to guide large particles into the center of the through holes of the large-pore filtration zone (3). The inner wall of the through holes of the elliptical-pore filtration zone (4) is provided with a spiral flow guiding structure (1-1). The through holes of the small-pore filtration zone (5) are arranged in a close arrangement. The surface of each filtration zone is provided with protrusions (6). The array comprises: protrusions (6) of the large-pore filter zone (3) arranged circumferentially around each through hole; protrusions (6) of the elliptical-pore filter zone (4) located at both ends of the long axis of the through hole; protrusions (6) of the small-pore filter zone (5) evenly distributed; the size and distribution density of the protrusions (6) gradually change with the through hole size of the corresponding filter zone; the funnel-shaped through hole of the large-pore filter zone (3) cooperates with the surrounding protrusions (6) to form a large particle pre-filtration channel; the spiral flow guiding structure (1-1) of the elliptical-pore filter zone (4) cooperates with the axial protrusions (6) to form a medium particle swirling filter channel; and the closely arranged through holes of the small-pore filter zone (5) cooperate with the protrusions (6) to form a small particle filter channel.

2. The water-based varnish gradient filtration system according to claim 1, characterized in that, It also includes a graded flow diversion system, which comprises: The filtrate transfer device (7) is located below the filter plate (2); The filtrate collector (8) is connected to the filtrate transition device (7) by a guide pipe (9).

3. The water-based varnish gradient filtration system according to claim 2, characterized in that, The filtrate transfer device (7) is provided with a three-layer structure stacked on top of each other: The upper diffuser plate (10) is provided with uniformly distributed strip-shaped through holes; The middle layer buffer mesh (11) is an 80-100 mesh stainless steel plain weave mesh; The lower guide plate (12) has one end of the guide pipe (9) connected to the lower guide plate (12) and the other end connected to the filtrate collector (8).

4. The water-based varnish gradient filtration system according to claim 1, characterized in that, The filter plate (2) is provided with a flow guide baffle structure (13) on both sides along the flow direction of the varnish, which is used to guide the varnish to the large hole filter area (3), the elliptical hole filter area (4) and the small hole filter area (5) in sequence.

5. The water-based varnish gradient filtration system according to claim 1, characterized in that, The pore size of the large pore filter zone (3) is 1.2-1.5 times that of the pore size of the elliptical pore filter zone (4), and the pore size of the small pore filter zone (5) is 0.6-0.8 times that of the elliptical pore filter zone (4).

Images