Three-period array extremely-small curved surface filter for binder spraying additive manufacturing
The three-period array of minimal curved surface filters was prepared by binder spraying additive manufacturing technology, which solved the problem of low specific surface area of traditional exhaust gas filters and achieved a highly efficient exhaust gas purification effect.
Patent Information
- Application Number
- CN202520086061.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-15
- Publication Date
- 2026-01-02
- Estimated Expiration
- 2035-01-15
AI Technical Summary
Traditional exhaust filters have a low specific surface area, which limits the catalytic efficiency of the coating and makes it difficult to meet the modern demand for efficient and environmentally friendly exhaust treatment.
A three-period array of minimal curved surface filters was prepared using binder jet additive manufacturing technology. The filter element is formed by periodically arraying minimal curved surface structural units along the x, y, and z directions, which increases the specific surface area and filtration efficiency.
It significantly improves the specific surface area and filtration efficiency of the filter, reduces dirt and particulate matter deposition, keeps the filter element clean, and reduces cleaning and maintenance workload.
Smart Images
Figure CN223747164U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of purification equipment, in particular to a three-periodic array minimal surface filter of binder jet additive manufacturing. BACKGROUND
[0002] The exhaust filter undertakes the heavy task of capturing and converting harmful substances. The filter core with high specific surface area can significantly improve the performance of the exhaust filter, thereby reducing the emission of pollutants at the source.
[0003] However, the traditional process has many limitations in preparing the exhaust filter. The complex process and high cost make large-scale production impractical. More regrettable is that these processes can only produce straight-through hole honeycomb filter cores, which have limited specific surface area and severely restrict the performance of the coating catalyst. In the pursuit of more efficient and environmentally friendly exhaust treatment technology, these traditional methods are obviously unable to meet the needs of modern society. CONTENT OF THE INVENTION
[0004] In view of this, in order to solve the problem of low specific surface area of traditional filters, the present application provides a three-periodic array minimal surface filter of binder jet additive manufacturing.
[0005] The specific technical solutions adopted are as follows:
[0006] A three-periodic array minimal surface filter of binder jet additive manufacturing, comprising: a shell provided with an inlet and an outlet, and a filter core fixed inside the shell; characterized in that: the filter core is a porous structure with a minimal surface, and the filter core is formed by a minimal surface structure unit in the x, y, and z directions in a periodic array.
[0007] Preferably, the function expression of the minimal surface structure unit is as follows:
[0008] F(x,y,z)=6cos(2πkx / L)cos(2πky / L)cos(2πkz / L)+sin(2πkx / L)sin(2πky / L)cos(2πkz / L)+s in(2πkx / L)cos(2πky / L)cos(2πkz / L)+2sin(2πkx / L)cos(2πky / L)sin(2πkz / L)+cos(2πkx / L)
[0009] cos(2πky / L)sin(2πkz / L)=c
[0010] Where x, y, and z are the spatial rectangular coordinate system, c is the horizontal control parameter, L represents the structure size of the filter core, and k represents the cell number of the minimal surface structure unit in the x, y, and z directions.
[0011] Further, the structure size L is 1-1000mm; or / and the cell number k of the minimal surface structure unit is ≥1.
[0012] Further, the structure size L is 1-1000mm; or / and the cell number k of the minimal surface structure unit is ≥1.
[0013] Further, the horizontal control parameter c ranges from 0.5 to 1.7.
[0014] Preferably, the filter core is made of one or at least two of metal, alloy, ceramic or a composite material thereof.
[0015] Further, the filter core is made of one or at least two of Fe20Cr5Al alloy or cordierite or a composite material thereof.
[0016] The shape of the filter material can be adaptively designed according to the application scenario; specifically, the filter core is a cuboid, a cube, a cylinder, a prism, a sphere or an irregular shape.
[0017] Preferably, the filter core is prepared by adhesive jet printing, solidification, debinding, sintering or infiltration heat treatment.
[0018] The beneficial effects of the present application are as follows:
[0019] The present application breaks through the shortcomings of the current honeycomb structure of the tail gas filter, which only has straight-through holes and a low specific surface area.
[0020] The present application provides an innovative three-period array minimal surface filter, which effectively improves the specific surface area and filtering efficiency of the filter, thereby significantly improving the performance of tail gas purification. The introduction of the three-period array minimal surface filter not only greatly increases the specific surface area of the filter core, but also its smooth structure that is interconnected, which can better promote the flow of tail gas and reduce the deposition of dirt and particulate matter. This not only helps to maintain the cleanliness of the filter core, but also reduces the workload of cleaning and maintenance.
[0021] The present application provides a new idea of using a porous structure with a minimal surface as a filter core; the filter core provided by the present application is not only suitable for automobile tail gas treatment, but also suitable for the filtration or catalytic purification treatment of other materials to be filtered.
[0022] Compared with the existing Diamond structure with a large specific surface area, the minimal surface structure provided by the present application has a more advantageous specific surface area, thereby ensuring its excellent filtering efficiency. BRIEF DESCRIPTION OF DRAWINGS
[0023] Figure 1It is the effect picture of the filter of the three periodic array extremely small curved surface of the binder jetting additive manufacturing of the utility model.
[0024] Figure 2 It is the perspective effect picture of the filter element of the utility model.
[0025] Figure 3 It is the effect picture of the main view angle of the filter element of the utility model.
[0026] Figure 4 It is the effect picture of the plan view angle of the filter element of the utility model.
[0027] Figure 5 It is the perspective effect picture of the extremely small curved surface structure unit of the utility model.
[0028] Figure 6 It is the effect picture of the main view angle of the extremely small curved surface structure unit of the utility model.
[0029] Figure 7 It is the perspective effect picture of the comparative example Diamond structure.
[0030] In the drawing: 1, shell, 2, filter element, 3, extremely small curved surface structure unit, 4, wall, 5, hole. DETAILED DESCRIPTION
[0031] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings of the present application. Obviously, the embodiments described in the present application are only part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.
[0032] In all examples shown and discussed herein, any specific values should be interpreted as merely exemplary, and not as a limitation. Thus, other examples of example embodiments can have different values.
[0033] Techniques, methods, and apparatus known to those of ordinary skill in the relevant art can not be discussed in detail herein. However, where appropriate, such techniques, methods, and apparatus should be considered as part of the present disclosure.
[0034] It should be noted that like reference numerals and letters refer to like items in the several views of the drawings, and as such, definitions of those items in one view or figure should be deemed to be incorporated in the other figures or drawings wherein the same numbers are used. It is also to be understood that the various embodiments can be used alone or in any suitable combination with one another.
[0035] Reference Figures 1 to 4The embodiment provides a three-periodic array minimal surface filter of binder jetting additive manufacturing, which comprises a shell 1 provided with an inlet and an outlet and a filter core 2 arranged in the shell 1, and a to-be-filtered substance such as tail gas enters from the inlet at one end, flows through the filter core 2 for filtration, and flows out from the outlet at the other side. The inlet and the outlet can be oppositely arranged; the inlet and the outlet can also be arranged on adjacent surfaces of the shell or at right angles.
[0036] The filter core is a porous structure with a minimal surface, and the filter core is formed by periodic array of minimal surface structure units in x, y and z directions.
[0037] In combination with Figure 5 and 6 As shown in the figure, the filter core 2 is a three-periodic array minimal surface structure formed by array of minimal surface structure units 3 in x, y and z directions. The wall surface 4 of each minimal surface structure unit 3 of the filter core 2 is a minimal surface, which increases the contact area with the tail gas, the holes 5 formed by the wall surface 4 of each minimal surface structure unit 3 and the holes 5 formed between adjacent minimal surface structure units 3 form a smooth and tortuous tail gas flow path, and the deposition of dirt and particulate matters on the filter core 2 is reduced.
[0038] In the embodiment, the function expression corresponding to the minimal surface structure unit 3 is as follows: F(x, y, z) = 6cos(2πkx / L)cos(2πky / L)cos(2πkz / L) + sin(2πkx / L)sin(2πky / L)cos(2πkz / L) + sin(2πkx / L)cos(2πky / L)cos(2πkz / L) + 2sin(2πkx / L)cos(2πky / L)sin(2πkz / L) + cos(2πkx / L)cos(2πky / L)sin(2πkz / L) = c
[0039] cos(2πky / L)sin(2πkz / L) = c
[0040] Wherein x, y and z are space orthogonal coordinate systems, c is a horizontal control parameter, L represents the structure size of the filter core, and k represents the cell number of the minimal surface structure unit in x, y and z directions.
[0041] As in the embodiment, the structure size L of the filter core 2 is 120 mm, the cell number k of the minimal surface structure unit is 3, the horizontal control parameter c is 0.65, the porosity of the filter core is 75%, and the specific surface area is 207.693 m 2 / m 3 .
[0042] In the embodiment, the filter core is a cube structure, and the length, width and height of the filter core are consistent, i.e., the structural size L of the filter core.
[0043] It can be understood that, in other embodiments, the filter core can be a cuboid with inconsistent dimensions in the length, width and height directions.
[0044] The horizontal control parameter c ranges from 0.5 to 1.7, and the horizontal control parameter c determines the thickness of the wall surface of the minimal curved surface structure unit, and thus determines the porosity of the minimal curved surface structure unit; when the horizontal control parameter c is 0.5-1.7, the porosity of the minimal curved surface structure unit is 40-80%.
[0045] The minimal curved surface structure unit is usually designed based on a cube structure, and the unit volume ratio V R of the minimal curved surface structure unit is the ratio of the volume V p of the minimal curved surface structure unit to the volume V s of a solid cube corresponding to the size of the minimal curved surface structure unit, i.e., The porosity p of the minimal curved surface structure unit is 1-V R .
[0046] The shape of the filter core is not limited, and in the embodiment, the shape of the filter core 2 is set to a cube with a size of 120mm*120mm*120mm. It can be understood that, in other embodiments, the filter core 2 can also be set to other shapes, such as a cuboid, a cylinder, a prism, a sphere or an irregular shape. The present application mainly protects the idea of using a porous structure with a minimal curved surface as a filter core, and is not limited to the shape of the filter core.
[0047] Since the gradient minimal curved surface and the internal hole 5 structure of the filter core 2 are complex, it is difficult to use traditional processes to manufacture, and therefore existing binder jet additive manufacturing technology is adopted for forming.
[0048] In the embodiment, the material of the filter core 2 is one or a composite material of Fe20Cr5Al alloy or cordierite, and the Fe20Cr5Al alloy or cordierite is a commonly used automobile exhaust filtration material at present, i.e., existing Fe20Cr5Al alloy or / and cordierite powder material is used to prepare the filter core through existing binder jet printing, solidification, debinding and sintering processes.
[0049] In other embodiments, the material of the filter core 2 can also be a composite material of one or at least two of existing metals, alloys and ceramics, and preferably a composite material of one or at least two of metals, alloys and ceramics that are wear-resistant, high-temperature-resistant and oxidation-resistant.
[0050] The filter core does not involve improvement of the material itself and a manufacturing method, and is prepared by adopting an adhesive jet printing, solidification, degreasing, sintering or infiltration heat treatment of the existing material.
[0051] The utility model discloses the filter core is not only applicable to the treatment of automobile exhaust, but also applicable to the purification treatment of other to-be-filtered materials.
[0052] Comparative example 1
[0053] The comparative example provides a filter core with a structure unit of Diamond minimal surface structure, as shown in the formula (1), which has the largest specific surface area among the currently known three-period minimal surface structures; the filter core is formed by periodically arraying the minimal surface structure units along x, y and z directions. Figure 7
[0054] The function expression corresponding to the minimal surface structure unit is as follows:
[0055] F (x, y, z) = sin (2πkx / L) sin (2πky / L) sin (2πkz / L) + sin (2πkx / L) cos (2πky / L) cos (2πkz / L)
[0056] + cos (2πkx / L) sin (2πky / L) cos (2πkz / L) + cos (2πkx / L) cos (2πky / L) sin (2πkz / L) = c
[0057] In the comparative example, the structure size of the filter core is set as L=120mm, the cell number of the minimal surface structure unit is k=3, the horizontal control parameter is c=0.31, the porosity of the filter core is 75%, and the specific surface area is 195.143m 2 / m 3 , which is obviously lower than that of the embodiment.
Claims
1. A three-periodic array minimal surface filter of binder jet additive manufacturing, comprising: The shell with an inlet and an outlet, and a filter core fixed inside the shell; characterized in that: the filter core is a porous structure with a minimal surface, the filter core is formed by a minimal surface structure unit in x, y, z three directions in a periodic array; the function expression of the minimal surface structure unit is as follows: F(x,y,z)=6cos(2πkx / L)cos(2πky / L)cos(2πkz / L)+sin(2πkx / L)sin(2πky / L)cos(2πkz / L)+sin(2πkx / L)cos(2πky / L)cos(2πkz / L)+2sin(2πkx / L)cos(2πky / L)sin(2πkz / L)+cos(2πkx / L)cos(2πky / L)sin(2πkz / L)=c Where x, y, z are the rectangular coordinate system, c is the horizontal control parameter, L represents the structure size of the filter core, and k represents the cell number of the minimal surface structure unit in the x, y and z directions.
2. The binder jetted additive manufactured tri-periodic array minimal surface filter of claim 1, wherein: The structure size L is 1-1000mm; or / and the cell number k of the minimal surface structure unit is greater than or equal to 1.
3. The binder jetted additive manufactured tri-periodic array minimal surface filter of claim 2, wherein: The structure size L is 100-1000mm; or / and the cell number k of the minimal surface structure unit is 1-99.
4. The binder jetted additive manufactured tri-periodic array minimal surface filter of claim 1, wherein: The horizontal control parameter c ranges from 0.5 to 1.
7.
5. The binder jetted additive manufactured tri-periodic array minimal surface filter of claim 1, wherein: The material of the filter core is one of metal, alloy and ceramic.
6. The binder jetted additive manufactured tri-periodic array minimal surface filter of claim 5, wherein: The material of the filter core is one of Fe20Cr5Al alloy and cordierite.
7. The binder jetted additive manufactured tri-periodic array Gaukler filter of claim 1, wherein: The filter core is a cuboid, a cylinder, a prism, a sphere or an irregular shape.
8. The binder jetted additive manufactured tri-periodic array Gaukler filter of claim 1, wherein: The filter core is prepared by adhesive jet printing, solidification, debinding, sintering or infiltration heat treatment.