CN115573793A - Particulate Filters and Extrusion Dies - Google Patents

Abstract

The invention discloses a particulate filter and an extrusion die. The particle filter comprises a body, wherein a plurality of inlet channels and a plurality of outlet channels are arranged in the body, the inlet channels and the outlet channels are adjacently arranged, the inlet channels are not connected, the outlet channels are not connected, the hydraulic diameter of the inlet channels is larger than that of the outlet channels, the body between the two adjacent channels forms the pipe walls of the channels, and the pipe walls of the channels, the extension lines of which are positioned on the same straight line, have the same thickness. The particle filter has asymmetric channels, but the thickness of the tube wall of a plurality of the channels with extension lines positioned on the same line is equivalent, so that the particle filter can adopt the traditional electric spark cutting to produce an extrusion die, thereby having good filtering performance and lower production cost, and simultaneously being capable of easily obtaining large filter size.

Description

Particulate Filters and Extrusion Dies

technical field

The present invention relates to the field of materials, in particular particle filters and extrusion dies.

Background technique

A particulate filter, such as a diesel particulate filter (DPF), is an important component installed in the exhaust system of a diesel vehicle to reduce particulate matter (PM) emissions by mechanically separating/retaining particles in the exhaust gas. DPF filtration is achieved by passing the exhaust gas through a porous media that only allows particles of a specific size to pass through. As a result, particles that pass through the pores of the media pass through the filter, while oversized particles remain within the filter. It is therefore understandable that, over time, soot and ash build up in the filter channels, especially the inlet channel, resulting in restricted flow through the filter and ultimately increased back pressure in the system. However, most of the current DPFs adopt a channel cross-section composed of a symmetrical structure, in which the size of the inlet channel is the same as that of the outlet channel. The symmetrical structure DPF continuously captures PM during use. When the PM is captured to a certain extent, the back pressure will increase greatly, and the increase in back pressure will affect the fuel consumption and power of the car. Although the above problems can be alleviated to a certain extent by adopting an asymmetric structure of the DPF, the size of the inlet channel and the outlet channel of the asymmetric structure are different, and the inlet channel has a larger area, which in turn allows a higher soot load per pore density, which can reduce Effect of soot loading on backpressure, but at the expense of increased initial backpressure.

However, due to the asymmetric structure of the channel wall, the DPF with asymmetric channel structure cannot use the traditional electric discharge machine (EDM) to produce extrusion dies, and special tools are required. This special tool has a series of disadvantages, resulting in high manufacturing cost, difficult manufacturing, time-consuming and difficult to scale up, etc. Therefore, current particle filters and extrusion dies still need to be improved.

Contents of the invention

The present invention aims to alleviate or even solve at least one of the above-mentioned problems to a certain extent.

In one aspect of the invention, the invention proposes a particulate filter. The particle filter includes a body, the body has a plurality of inlet passages and a plurality of outlet passages, the inlet passages and the outlet passages are arranged adjacently, and the plurality of inlet passages are not connected, and the plurality of outlet passages are arranged adjacent to each other. The outlet channels are also not connected, the hydraulic diameter of the inlet channel is larger than the hydraulic diameter of the outlet channel, the body located between two adjacent channels constitutes the pipe wall of the channel, and the extension line is located at the same The pipe walls of the plurality of channels on the straight line have the same thickness. The particle filter has channels with an asymmetric structure, but the thickness of the tube walls of the plurality of channels whose extension lines are located on the same straight line is comparable, so that the particle filter can be produced by traditional electric spark cutting extrusion dies, so it has good Excellent filtration performance and low production costs, while large filter sizes can be obtained relatively easily.

According to an embodiment of the present invention, on the extension line of any one tube wall of the channel, there are a plurality of other tube walls of the channel distributed. As a result, the production difficulty of the extrusion die for forming the filter can be reduced, which is beneficial to reduce the production cost of the particle filter.

According to an embodiment of the present invention, the thickness of the pipe wall of the inlet passage is comparable to the thickness of the pipe wall of the outlet passage. As a result, the production costs of the particle filter can be further reduced.

According to an embodiment of the present invention, the ratio of the areas of the inlet channel to the outlet channel is 1.2-2. Thus, the performance of the particulate filter can be further improved.

According to an embodiment of the present invention, the ratio of the areas of the inlet channel to the outlet channel is 1.3-1.6. Thus, the performance of the particle filter can be further improved.

According to an embodiment of the present invention, in a direction perpendicular to the extending direction of the channel, cross-sections of the inlet channel and the outlet channel are both triangular. Thus, an asymmetric structure in which the inlet passages and the outlet passages are arranged in a staggered manner can be easily formed.

According to an embodiment of the present invention, the cross-sections of the inlet channel and the outlet channel are both equilateral triangles. Thus, the performance of the particle filter can be further improved.

According to an embodiment of the present invention, the plurality of channels are arranged in multiple rows and columns, one of the two adjacent channels in the same row is the inlet channel, and the other is the outlet channel, In a direction perpendicular to the extending direction of the channels, the cross-sections of the adjacent inlet channels and the outlet channels together form a parallelogram. Thus, the performance of the particle filter can be further improved.

According to an embodiment of the present invention, one of the two adjacent channels in the same column is the inlet channel, and the other is the outlet channel, and in the direction perpendicular to the extending direction of the channels, adjacent The cross-sections of the inlet channel and the outlet channel together form a rhombus. Thus, the performance of the particulate filter can be further improved.

According to an embodiment of the present invention, the difference between the side length of the triangular inner wall of the inlet channel and the side length of the triangular inner wall of the outlet channel is smaller than the thickness of the tube wall. In this way, it can be easily ensured that the pipe walls of the asymmetric structure are all made of straight lines, thereby further reducing the production cost of the particle filter.

According to an embodiment of the present invention, the particle filter meets at least one of the following conditions: the thickness of the pipe wall of the channel is 100-10000 microns, preferably 200-1000 microns; the bulk density of the particle filter is 0.45 -0.8kg/L; the hydraulic diameter of the inlet channel is 100-10000 microns, preferably 900-1800 microns. Thus, the performance of the particle filter can be further improved.

According to an embodiment of the invention, said body is formed of a porous medium. Thus, the performance of the particle filter can be further improved.

According to an embodiment of the present invention, the inlet passage has a first end and a second end, the first end is the inlet of the medium to be filtered, and the second end is a closed structure; the outlet passage has a third end and a second end. Four ends, the fourth end is the outlet of the medium to be filtered, the third end is a closed structure, the first end and the third end are on the same side, and the second end and the fourth end are on the same side the same side, and the medium to be filtered can pass through the pipe wall between the inlet passage and the outlet passage, and flow from the inlet side of the filter medium to the outlet of the filter medium. Thus, the performance of the particle filter can be further improved.

In another aspect of the invention, the present invention proposes an extrusion die for producing a particulate filter. The mold includes: a mold body with a feed hole; a plurality of first moldings and a plurality of second moldings, the first moldings and the second moldings are arranged adjacently, and A plurality of first forming parts are not connected, and a plurality of second forming parts are not connected, the hydraulic diameter of the first forming part is larger than the hydraulic diameter of the second forming part, and the feed hole Located between two adjacent molded parts, the distance between two adjacent molded parts constitutes the pipe wall of the particle filter to be extruded, the size and position of the first molded part and the second molded part are determined The pipe walls arranged so that the extension lines lie on the same straight line have the same thickness. The extrusion die can easily form the aforementioned particle filter, which is beneficial to reduce the production cost of the particle filter.

According to an embodiment of the present invention, the extrusion die is configured for producing the aforementioned particulate filter.

According to an embodiment of the present invention, the extrusion die is formed by electric discharge machine cutting. Thus, the cost of forming the extrusion die can be further reduced, which is beneficial to reduce the production cost of producing the aforementioned particle filter.

Description of drawings

The above and/or additional aspects and advantages of the present invention will become apparent and comprehensible from the description of the embodiments in conjunction with the following drawings, wherein:

FIG. 1 shows a schematic structural view of a particulate filter in the related art;

Figure 2 shows a schematic structural view of another particulate filter in the related art;

FIG. 3 shows a schematic structural view of a particulate filter according to an embodiment of the present invention;

FIG. 4 shows a schematic structural view of a particle filter according to another embodiment of the present invention;

Figure 5 shows a schematic structural view of a particle filter according to yet another embodiment of the present invention;

FIG. 6 shows a schematic structural view of a particle filter according to yet another embodiment of the present invention;

FIG. 7 shows a partial structural schematic diagram of a particle filter according to an embodiment of the present invention;

Fig. 8 shows a schematic structural view of an extrusion die for preparing a particulate filter according to an embodiment of the present invention.

Description of drawings:

1000: particle filter; 100: body; 110: inlet channel; 120: outlet channel; 2000: extrusion die; 1: feed hole; 2: first molding; 3: second molding.

detailed description

Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals designate the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary only for explaining the present invention and should not be construed as limiting the present invention.

In one aspect of the invention, the invention proposes a particulate filter. The particle filter includes a body, the body has a plurality of inlet passages and a plurality of outlet passages, the inlet passages and the outlet passages are arranged adjacently, and the plurality of inlet passages are not connected, and the plurality of outlet passages are arranged adjacent to each other. The outlet channels are also not connected, the hydraulic diameter of the inlet channel is larger than the hydraulic diameter of the outlet channel, the body located between two adjacent channels constitutes the pipe wall of the channel, and the extension line is located at the same The pipe walls of the plurality of channels on the straight line have the same thickness. The particle filter has channels with an asymmetric structure, but the thickness of the tube walls of the plurality of channels whose extension lines are located on the same straight line is comparable, so that the particle filter can be produced by traditional electric spark cutting extrusion dies, so it has good Excellent filtration performance and low production costs, while large filter sizes can be obtained relatively easily.

For the convenience of understanding, the principle that the present application can realize the above-mentioned beneficial effects is briefly described below:

As mentioned above, with reference to FIG. 1, since the inlet channel 110' and the outlet channel 120' of the symmetrical diesel particulate filter (DPF) have the same area, after a period of use, due to the accumulation of soot and other substances in the inlet channel, This leads to a decrease in the actual flow rate of the inlet channel, which in turn leads to an increase in the back pressure of the system. Although in the related art, in order to solve the problem of the flow reduction and system back pressure increase caused by the accumulation of soot and other substances in the inlet channel after the DPF has been used for a period of time, an asymmetric design of the inlet channel and the outlet channel is adopted. Refer to Figure 2, that is, the inlet channel The area is larger than the area of the exit channel. However, in addition to the above-mentioned problems such as processing difficulties caused by the above-mentioned technical solutions, the asymmetric channel structure also limits the size of the DPF product: Referring to Figure 1, the pipe walls of the inlet and outlet of the traditional symmetrical DPF structure are also symmetrical, that is, more The walls of the inlet and outlet are defined by a number of intersecting straight lines. In the asymmetric structure, due to the asymmetrical area of the outlet and the inlet, the tube wall between the inlets and the outlets of two adjacent rows will be bent. Referring to FIG. 2 , that is, the pipe wall of the DPF is not formed by multiple straight lines, and there is an inflection point in the extension direction of the pipe wall. This structure will cause additional stress in the DPF matrix, which in turn will cause the pipe wall at this location to crack more easily. And as the size difference between the inlet and outlet channels increases, the thickness of the wall intersections decreases, further reducing the thermal and mechanical strength of the particulate filter body.

The particulate filter proposed by the present invention designs the structure of the inlet and outlet passages, so that while ensuring that the hydraulic diameter of the inlet passage is greater than that of the outlet passage, multiple passages whose extension lines can be located on the same straight line The thickness of the pipe wall is equivalent. Specifically, referring to FIG. 3 , by improving the cross-sectional shape of the inlet channel (110A and 110B shown in the figure) and the outlet channel 120 of the particulate filter 1000, the part of the body 100 between the channels can still be made of Straight line structure, thereby on the one hand can avoid the difficult problem of mold processing caused by the pipe wall with inflection point, on the other hand, this design can also make the thickness of the pipe wall of a plurality of described channels whose extension lines are located on the same straight line ( d) as shown in the figure is equivalent. In this way, the problem of stress increase caused by the change of pipe wall thickness at the inflection point can be solved, thereby further improving the service life of the particle filter.

Below, according to specific embodiments of the present invention, the specific structure of the particulate filter will be described in detail:

According to an embodiment of the present invention, referring to FIG. 4 , on the extension line of any tube wall of the channel, there are a plurality of tube walls of other channels distributed. Specifically, the extension line where the pipe wall between the inlet channel 110A and the outlet channel 120C is located may also be distributed with the pipe wall forming between the inlet channel 110C and the outlet channel 120B. Similarly, the body of the particle filter proposed by the present invention can form a plurality of intersecting straight lines to define a plurality of inlet and outlet passages, that is to say, the body 100 of the particle filter of the present invention can be composed of multiple intersecting lines. The main body 100 has no broken lines or inflection points. As a result, the production difficulty of the extrusion die for forming the filter can be reduced, which is beneficial to reduce the production cost of the particle filter.

According to an embodiment of the present invention, referring to FIG. 4, the thickness of the pipe wall of the inlet channel (110A-110C as shown in the figure) and the thickness of the pipe wall of the outlet channel (120A-120C as shown in the figure) are comparable. For example, specifically, the wall thickness d of the inlet channel 110B can be consistent with the wall thickness d of the outlet channel 120B, and more specifically, the wall thickness d of any one of the multiple inlet channels can be the same as that of any one of the multiple outlet channels. A uniform wall thickness. In other words, the body of the particulate filter according to the embodiment of the present invention may be formed by intersecting a plurality of straight lines with uniform thickness. Thus, the production cost of the particle filter can be further reduced, and the extrusion die used to prepare the particle filter can rely on the technology of the extrusion die of the particle filter with symmetrical structure in the related art (that is, use the traditional electric spark machine (EDM)) for preparation. Moreover, the body of the particle filter composed of multiple intersecting straight lines with the same thickness is also beneficial to improve the overall mechanical strength of the particle filter, and further increase the manufacturable overall diameter and size of the particle filter.

According to the embodiment of the present invention, the specific size, area and shape of the inlet channel and the outlet channel are not particularly limited, as long as the above functions can be realized. For example, according to some specific embodiments of the present invention, the ratio of the areas of the inlet channel to the outlet channel may be 1.2-2. For example, it may be 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, 2, etc. Specifically, the area ratio of the inlet channel and the outlet channel may range from 1.3 to 1.6, specifically 1.25-1.75, specifically 1.56. Thus, the performance of the particle filter can be further improved. The inventors have found that when the above ratio range is too large, the actual filtering effect of the particle filter will be affected because the area of the inlet channel is significantly larger than the area of the outlet channel: too small an area of the outlet channel may lead to a large initial back pressure of the system, And the filtration efficiency is low; when the ratio of the inlet channel to the outlet channel is too small, that is, the inlet channel is larger than the outlet channel, it is difficult to solve the back pressure increase caused by the accumulation of soot and other substances in the inlet channel after a period of use The problem.

According to an embodiment of the present invention, referring to FIGS. 3-6 , in a direction perpendicular to the extending direction of the channels, the cross sections of the inlet channel and the outlet channel are both triangular. Thus, an asymmetric structure in which the inlet passages and the outlet passages are arranged in a staggered manner can be easily formed. More specifically, referring to FIG. 4 , the sections of the inlet channel and the outlet channel are both equilateral triangles: taking the inlet channel 110C as an example, the lengths of the three inner edges a constituting the section of the inlet channel 110C can be equal. The lengths of the three inner edges b in the section of the outlet channel 120C may be equal. As a result, the performance of the particle filter can be further improved. The lengths of the edges of the inlet and outlet passages are equal. During the use of the particle filter, the stress on each edge is consistent, which is also conducive to improving the The service life of the particle filter.

According to an embodiment of the present invention, referring to FIG. 5 , multiple channels are arranged in multiple rows and multiple columns. One of the two adjacent channels in the same row is an inlet channel (eg 110A), and the other is an outlet channel (eg 120C). In a direction perpendicular to the direction in which the channel extends, the adjacent inlet channel and the outlet channel The cross-sections of the passages together form a parallelogram (shown by the dashed box in the figure). Therefore, under the premise of ensuring that the pipe wall between multiple inlets and outlets is composed of multiple intersecting straight lines, the area occupied by the inlet and outlet passages can be saved, so that more particles can be accommodated in the unit volume of the particle filter. More inlet and outlet channels can improve the filtering effect of the particle filter.

According to an embodiment of the present invention, with reference to Fig. 6, one of the two adjacent passages in the same column is the entrance passage (110A as shown in the figure), and the other is the exit passage (as shown in the figure 120A shown in ), in the direction perpendicular to the extending direction of the channel, the cross-sections of adjacent inlet channels and outlet channels jointly form a rhombus (as shown by the dotted line box in the figure). Thus, the performance of the particle filter can be further improved.

According to an embodiment of the present invention, the difference between the side lengths of the triangular inner wall of the inlet channel and the side length of the triangular inner wall of the outlet channel is smaller than the thickness of the tube wall. In this way, it can be easily ensured that the pipe walls of the asymmetric structure are all made of straight lines, thereby further reducing the production cost of the particle filter.

According to an embodiment of the present invention, the particle filter meets at least one of the following conditions: the thickness of the pipe wall of the channel is 100-10000 microns; the bulk density of the particle filter is 0.45-0.8kg/L; the hydraulic diameter of the inlet channel is 100-10000 microns. Thus, the performance of the particle filter can be further improved. The particle filter can meet any one, any two, or all of the above requirements. The inventors found that when the particle filter meets the aforementioned requirements, it can have better filtering performance. For example, according to some examples of the present invention, the wall thickness of the channel is 200-1000 microns, and the hydraulic diameter of the inlet channel is 900-1800 microns. Specifically, when the hydraulic diameter of the inlet channel is 900-1800 microns, the particle filter has a moderate channel diameter, which can reduce the space occupied by the required cross section while the back pressure is relatively low. When the bulk density is within the above range, the filter area is moderate, and at the same time, it can maintain a high soot loading capacity and a low back pressure. When the pipe wall thickness is within the above range, good mechanical strength can be maintained without significantly increasing the back pressure. Therefore, the particle filter can have better overall performance.

According to the embodiment of the present invention, the specific material of the body 100 is not particularly limited, and those skilled in the art can select familiar materials to form the body 100 of the particle filter. For example, according to some embodiments of the present invention, the body 100 may be formed of a porous medium. More specifically, the material of the body 100 only needs to be used for filtering gas and trapping particles such as soot. For example, the material of the body 100 may be recrystallized silicon carbide. The material has good high-temperature mechanical properties, high temperature tolerance, high density, good mechanical properties and service life, and is especially suitable for the preparation of diesel particulate filters (DPF) that require a certain temperature A filter body that works continuously in the environment. According to an embodiment of the present invention, with reference to Fig. 7, the inlet channel 110 can have a first end and a second end, the first end is the inlet of the medium to be filtered (as shown by the arrow in the figure), and the second end is a closed end. structure. The outlet channel 120 has a third end and a fourth end, the fourth end is the outlet of the medium to be filtered (as shown by the arrow in the figure), and the third end is a closed structure. The first end and the third end are located on the same side, the second end and the fourth end are located on the same side, and the medium to be filtered can pass through the pipe wall between the inlet channel and the outlet channel, Flow from the inlet side of the filter medium to the outlet of the filter medium. Thus, the air containing soot and other particles entering the interior of the particle filter through the first end of the inlet passage 110 can pass through the pipe wall between the inlet passage 110 and the outlet passage 120 and enter the side of the outlet passage 120 and finally be discharged. Particles such as smoke and dust are trapped in the inlet channel 110 which is closed at the second end. Thus, the performance of the particulate filter can be further improved.

In general, the aforesaid particulate filter adopts an asymmetric structure, and at the same time, the body is composed of multiple intersecting straight lines, which in turn has the advantage of being easy to produce and does not require additional design of a mold for extruding the particulate filter . Moreover, the thickness of the pipe wall of each channel inside the particle filter is uniform, and the stress distribution is uniform, thereby forming a particle filter with a relatively large volume and ensuring a service life. In addition, the particulate filter also has a lower back pressure, which can reduce the pressure loss inside the exhaust pipe to which the particulate filter is applied, so that the vehicle using the particulate filter has higher fuel efficiency. In addition, the particle filter has at least one of the advantages of better soot loading capacity, longer maintenance interval, less impact on back pressure as time goes by, better heat resistance and higher mechanical strength.

In another aspect of the invention, the present invention proposes an extrusion die for producing a particulate filter. Referring to FIG. 8 , the mold includes: a mold body 2000 having a feed hole 1 on the mold body. The mold also has a plurality of first moldings 2 and a plurality of second moldings 3, the first moldings and the second moldings are arranged adjacently, and the plurality of first moldings are not connected, and more The two second forming parts are not connected, the hydraulic diameter of the first forming part is larger than the hydraulic diameter of the second forming part, the feed hole is located between two adjacent forming parts, and the adjacent forming parts The distance between the two profiles constitutes the tube wall of the particulate filter to be extruded, said first profile and said second profile being sized and positioned so that extension lines lie on the same straight line as the tube wall Equivalent thickness. The extrusion die can easily form the aforementioned particle filter, which is beneficial to reduce the production cost of the particle filter.

Specifically, the first molding can be used to form the inlet channel in the aforementioned particle filter, and the second molding can be used to form the outlet channel of the aforementioned particle filter. Those skilled in the art will appreciate that the extrusion die described above can be used to form the particulate filter described above. The structure and advantages of the particle filter have been described in detail above. The above-mentioned extrusion die has first and second molded parts for forming the inlet and outlet channels of the particle filter, so the first and second molded parts It may have the same features as the inlet and outlet passages, which will not be repeated here.

Specifically, referring to FIG. 8 , the first molded parts 2 and the second molded parts 3 on the extrusion die 2000 are arranged adjacent to each other, and the plurality of first molded parts are not connected, and the plurality of second molded parts are not connected. Also not connected, the hydraulic diameter of the first molding is greater than the hydraulic diameter of the second molding, the feed hole 1 is located between the two moldings, and the distance between the adjacent two moldings constitutes the The size and position of the tube wall of the particle filter, the first molded part and the second molded part are configured such that the thickness of the tube wall whose extension lines lie on the same straight line is equal. The extrusion die according to the embodiment of the present invention can be cut and formed by a conventional electric discharge machine. Thus, the cost of forming the extrusion die can be further reduced, which is beneficial to reduce the production cost of producing the aforementioned particle filter.

In the description of the present invention, the orientations or positional relationships indicated by the terms "upper", "lower" and the like are based on the orientations or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the present invention and do not require that the present invention must be based on a specific Azimuth configuration and operation, therefore, should not be construed as limiting the invention.

In the description of this specification, description with reference to the terms "one embodiment", "another embodiment", etc. means that a particular feature, structure, material, or characteristic described in connection with the embodiment is included in at least one embodiment of the present invention . In this specification, the schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the described specific features, structures, materials or characteristics may be combined in any suitable manner in any one or more embodiments or examples. In addition, those skilled in the art can combine and combine different embodiments or examples and features of different embodiments or examples described in this specification without conflicting with each other. In addition, it should be noted that in this specification, the terms "first" and "second" are used for description purposes only, and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of indicated technical features.

Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention, those skilled in the art can make the above-mentioned The embodiments are subject to changes, modifications, substitutions and variations.

Claims (16)

1. A particle filter, characterized in that it comprises a body, the body has a plurality of inlet passages and a plurality of outlet passages inside, the inlet passages and the outlet passages are arranged adjacently, and one of the plurality of inlet passages The outlet channels are not connected, and the hydraulic diameter of the inlet channel is larger than the hydraulic diameter of the outlet channel, and the body located between two adjacent channels constitutes the channel. the tube wall, The pipe walls of the plurality of channels whose extension lines are located on the same straight line have the same thickness. 2. The particle filter according to claim 1, characterized in that, on the extension line of any one tube wall of the channel, there are a plurality of tube walls of other channels distributed thereon. 3. The particle filter according to claim 1, wherein the wall thickness of the inlet channel is comparable to the thickness of the wall of the outlet channel. 4. The particle filter according to claim 1, characterized in that, the ratio of the areas of the inlet channel to the outlet channel is 1.2-2. 5 . The particle filter according to claim 4 , wherein the ratio of the areas of the inlet channel to the outlet channel is 1.3˜1.6. 6. The particle filter according to any one of claims 1-5, characterized in that, in a direction perpendicular to the extending direction of the passage, the cross-sections of the inlet passage and the outlet passage are both triangular. 7. The particle filter according to claim 6, wherein the cross-sections of the inlet channel and the outlet channel are both equilateral triangles. 8. The particulate filter according to claim 7, wherein a plurality of said channels are arranged in multiple rows and columns, and one of the two adjacent channels in the same row is the inlet channel, and the other is the outlet channel, in a direction perpendicular to the extending direction of the channel, the cross-sections of the adjacent inlet channel and the outlet channel together form a parallelogram. 9. The particulate filter according to claim 8, characterized in that one of the two adjacent channels located in the same column is the inlet channel, and the other is the outlet channel, and at right angles to the In the direction of the extending direction of the passages, the cross-sections of the adjacent inlet passages and the outlet passages jointly form a rhombus. 10. The particulate filter according to any one of claims 7-9, characterized in that the difference between the side lengths of the triangular inner wall of the inlet channel and the side length of the triangular inner wall of the outlet channel is less than that of the tube wall thickness. 11. The particulate filter according to claim 1, wherein the particulate filter satisfies at least one of the following conditions: The thickness of the tube wall of the channel is 100-10000 microns, preferably 200-1000 microns; The bulk density of the particle filter is 0.45-0.8kg/L; The hydraulic diameter of the inlet channel is 100-10000 microns, preferably 900-1800 microns. 12. The particulate filter of claim 1, wherein the body is formed of porous media. 13. The particulate filter according to claim 12, wherein the inlet channel has a first end and a second end, the first end is the inlet of the medium to be filtered, and the second end is a closed structure; The outlet channel has a third end and a fourth end, the fourth end is the outlet of the medium to be filtered, the third end is a closed structure, the first end and the third end are located on the same side, the second end and the fourth end are located on the same side, And the medium to be filtered can pass through the pipe wall between the inlet passage and the outlet passage, and flow from the inlet side of the filter medium to the outlet of the filter medium. 14. An extrusion die for preparing a particulate filter, comprising: A mold body, having a feeding hole on the mold body; A plurality of first moldings and a plurality of second moldings, the first moldings and the second moldings are arranged adjacently, and the plurality of first moldings are not connected, and the plurality of second moldings The parts are not connected, the hydraulic diameter of the first forming part is larger than the hydraulic diameter of the second forming part, the feed hole is located between two adjacent forming parts, and the two adjacent forming parts The distance between them constitutes the pipe wall of the particle filter to be extruded, and the size and position of the first molded part and the second molded part are configured such that the thickness of the pipe wall whose extension lines lie on the same straight line is equivalent. 15. The extrusion die according to claim 14, characterized in that the extrusion die is configured for the production of the particulate filter according to any one of claims 1-13. 16. The extrusion die according to claim 14, characterized in that the extrusion die is formed by electric discharge machine cutting.

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