Urea tank filling port filter and automobile

Abstract

The present invention relates to a filling port filter of a urea tank, which comprises: a filter mounting flange; a filter frame, which is mounted on the filter mounting flange, a first filter is arranged around the side of the filter frame, and a second filter is arranged around the bottom; a third filter is mounted on the side of the second filter close to the filter mounting flange, and the cross-sectional size of the third filter gradually decreases from the end close to the second filter to the end away from the second filter. When the urea solution is injected into the filling filter, most of the urea solution first passes through the third filter to break, separate and filter the droplets of the injected urea solution, and the urea solution that does not pass through the filter is splashed to the surrounding first filter, and the liquid surface is separated into smaller droplets through secondary breaking, separation and filtration at the edges of the filter, and the liquid surface is distributed to all directions of the first filter through reflection, thereby increasing the filter area through which the droplets pass, which is beneficial to improving the filling rate.

Description

Technical Field

[0001] The invention relates to the technical field of automobile SCR tail gas treatment, and in particular to a filling port filter screen of a urea tank and an automobile. Background Art

[0002] The urea supply system is located in the automobile post-processing system and is used to reduce the content of harmful nitrogen oxides in automobile exhaust. When the urea system is working, the urea pump sprays urea into the post-processor in a quantitative manner to generate harmless nitrogen and water. The urea tank is a component used to store urea in the SCR system. Its filling port is equipped with a filter to intercept large particles of impurities in the external urea solution to prevent impurities from entering the urea tank and causing urea metering pump failure. The mesh size of the filter should be within a reasonable range, which can not only filter impurities, but also ensure the filling rate of urea solution and ensure that the urea solution is quickly filled into the urea tank.

[0003] In the related art, the filter frame is cylindrical in shape, and the filter is also cylindrical in shape. In a specific size space, the area of ​​the filter is fixed, and the adjustment of the filling speed is mainly achieved by adjusting the mesh number of the filter. Under a fixed mesh number, there may be a problem of low urea filling rate. Summary of the invention

[0004] The embodiment of the present invention provides a filling port filter screen of a urea tank and a vehicle, so as to solve the problem that the filling speed is mainly adjusted by adjusting the mesh number of the filter screen in the related art, and the urea filling rate may be low under a fixed mesh number.

[0005] In a first aspect, a filling port filter of a urea tank is provided, which may include: a filter mounting flange, which is cylindrical, the filter mounting flange is an installation and fixing structure of the filling port filter assembly, and is used to fix the filling port filter assembly on the filling port component of the urea tank to ensure the normal use of the filling port filter assembly; a filter frame, which is installed on the filter mounting flange, and the side of the filter frame is surrounded by a first filter, and the bottom is surrounded by a second filter. In this embodiment, the filter frame is a polygonal filter, which is connected in sequence along the inner layer frame and the outer layer frame, and its top is connected to the filter mounting flange. The flange is connected, and the bottom is connected to the bottom polygonal skeleton. The filter skeleton is an edge structure that supports and fixes the filter. It is distributed on the circumference of the filter mounting flange, so that the entire side forms a polygonal filter structure, which plays the role of filtering, crushing, and sputtering separation of the injected urea solution. The top of the filter and the filter mounting flange are connected with the filter surrounding to ensure that the urea solution can be completely filtered; the third filter is installed on the side of the second filter close to the filter mounting flange, and the cross-sectional size of the third filter gradually decreases from the end close to the second filter to the end away from the second filter. In this embodiment, since a third filter screen with a gradually decreasing size is provided at the filling port, when the urea solution is injected into the filling filter screen, most of the urea solution first passes through the third filter screen to break, separate and filter the droplets of the urea solution being injected, and the urea solution that does not pass through the filter screen is splashed to the surrounding first filter screen, and is broken, separated and filtered twice by the edges of the filter screen, so that the liquid surface is separated into smaller droplets, and at the same time, the liquid surface is distributed to all directions of the first filter screen through reflection, thereby increasing the filter screen area through which the droplets pass, which is beneficial to improving the filling rate.

[0006] In some embodiments, the cross-section of the filter frame is polygonal, and the first filter is connected in sequence along multiple sides of the filter frame. Through the polygonal design of the filter frame, the area of ​​the filter is increased in a specific space, and the urea solution can be quickly added to the urea tank without increasing the number of filter meshes, thereby preventing large particles of impurities from entering the urea tank and improving the cleaning and maintenance cycle of the filter. The polygonal filter structure and the third filter at the bottom of the filling filter play a role in breaking and separating the droplets of the urea solution being added. Smaller droplets reduce the tension of the urea solution on the surface of the filter, making it easier for the urea solution to pass through the filter, which is conducive to speeding up the filling rate. When the urea solution is injected into the filling filter, most of the urea solution first passes through the third filter at the bottom of the filling filter, which plays a role in breaking and separating the droplets of the urea solution being added. The urea solution that does not pass through the filter is splashed to the surrounding polygonal filter screen, and is broken, separated and filtered for the second time by the filter screen edges, so that the liquid surface is separated into smaller droplets. At the same time, the liquid surface is distributed to all directions of the polygonal filter screen through reflection, which increases the filter screen area through which the droplets pass, and plays a +> effect, which is beneficial to increase the filling rate; at the same time, the liquid surface that partly contacts the polygonal filter screen first is broken, separated and filtered for the first time by the filter screen edges, and the part that does not pass through the filter screen is reflected to the third filter screen at the bottom of the filling filter screen, which plays a secondary droplet breaking, separation and filtration for the urea solution that is added. The two filters interact with each other, playing a +> effect, which is beneficial to increase the filling rate.

[0007] In some embodiments, the filter frame may include an inner frame and an outer frame connected in sequence, the inner frame and the outer frame both form a circle around the axis of the filter mounting flange, and the outer frame is located on the outer layer of the inner frame. The bottom surface of the third filter is circular, and the inner frame is located on the circumference of the bottom surface of the third filter. The cross section of the filter mounting flange is circular, and the outer frame is located on the circumference of the cross section of the filter mounting flange. In this embodiment, the filter frame is an edge structure for supporting and fixing the filter, including a side frame and a bottom frame, the side frame is divided into two layers, the inner frame and the outer frame, which are respectively evenly distributed on the circumference of the filter mounting flange, and the edges of the inner frame are evenly distributed in the center of the outer frame pile; the bottom frame is polygonal, which is formed by connecting the inner frame and the outer frame in sequence, and its inner circle is a ring frame connected to each vertex, which not only ensures the structural stability of the filter frame, but also provides a mounting structure for the second filter and the third filter at the bottom.

[0008] In some embodiments, the third filter is conical, with its bottom mounted on the second filter and its tip facing the filter mounting flange. In this embodiment, the third filter at the bottom is an upward conical structure filter fixed on the circular ring skeleton, whose conical surface is a filter structure, and there is no filter on the circular bottom plane, which is used for filtering, crushing, and sputtering separation of the injected urea solution; the second filter fills the area outside the circular ring skeleton and within the polygonal skeleton on the bottom skeleton, and together with the third filter constitutes the filtration area at the bottom of the filter to ensure that the urea solution can be completely filtered. When the urea solution is injected into the filling filter, most of the urea solution first passes through the conical filter at the bottom of the filling filter to break, separate and filter the droplets of the urea solution being injected. The urea solution that does not pass through the filter is splashed to the surrounding polygonal filter, and is broken, separated and filtered by the edges of the filter for the second time, so that the liquid surface is separated into smaller droplets. At the same time, the liquid surface is also distributed to all directions of the polygonal filter through reflection, which increases the filter area through which the droplets pass, and is beneficial to improving the filling rate. At the same time, part of the liquid surface that first contacts the polygonal filter is first broken, separated and filtered by the edges of the filter, and the part that does not pass through the filter is reflected to the conical filter at the bottom of the filling filter, which breaks, separates and filters the droplets of the urea solution injected for the second time. The two filters interact with each other, achieving the effect of 1+1>2, which is beneficial to improving the filling rate.

[0009] In some embodiments, the filter skeleton extends along the axial direction of the filter mounting flange. The axis of the third filter coincides with the axis of the filter mounting flange. The third filter is located inside the space enclosed by the first filter and the second filter. In this embodiment, the filter skeleton extends along the axial direction of the filter mounting flange to form a polygon, and the third filter is located inside the space enclosed by the first filter and the second filter, and coincides with the axis of the mounting flange, so that it can contact the injected urea solution to a greater extent, thereby breaking, separating, and filtering the droplets of the injected urea solution.

[0010] In a second aspect, an embodiment of the present invention further provides an automobile, comprising a urea tank, wherein the urea tank comprises the above-mentioned filling port filter. In this embodiment, since a third filter with a gradually decreasing size is provided at the filling port, when the urea solution is injected into the filling filter, most of the urea solution first passes through the third filter to break, separate and filter the droplets of the urea solution being injected. The urea solution that does not pass through the filter is splashed to the surrounding first filter, and is broken, separated and filtered for the second time at the edge of the filter, so that the liquid surface is separated into smaller droplets. At the same time, the liquid surface is distributed to all directions of the first filter through reflection, thereby increasing the filter area through which the droplets pass, which is beneficial to improving the filling rate.

[0011] The filling port filter of the present invention includes: a filter mounting flange, a filter frame, a first filter on the side, a second filter at the bottom, and a third filter at the bottom. Among them, the filter frame is an edge structure that supports and fixes the filter, including a side frame and a bottom frame. The side frame is divided into an outer frame and an inner frame, which are evenly distributed on the circumference of the filter mounting flange, and the edges of the inner frame are evenly distributed in the center of the outer frame pile; the bottom frame is polygonal, which is formed by connecting the outer frame and the inner frame in sequence, and its inner circle is a circular ring frame connected to each vertex, which not only ensures the structural stability of the filter frame, but also provides a mounting structure for the second filter and the third filter; the third filter is an upward conical structure filter fixed on the circular ring frame, and its conical surface is a filter structure, and there is no filter on the circular bottom plane, which is used The filter screen is used to filter, crush, and sputter the injected urea solution; the second filter screen is used to fill the area outside the circular frame and inside the polygonal frame on the bottom frame, and together with the third filter screen, it constitutes the filtering area at the bottom of the filter screen to ensure that the urea solution can be completely filtered; the first filter screen is formed by connecting the filter screen along the outer frame and the inner frame in sequence, and its bottom and top are respectively connected to the bottom polygonal frame and the filter screen mounting flange, so that the entire side forms a polygonal filter screen structure, which plays the role of filtering, crushing, and sputtering separation of the injected urea solution, and the top of the filter screen and the filter screen mounting flange are surrounded by filters to ensure that the urea solution can be completely filtered.

[0012] Through the polygonal design of the filter frame, the area of ​​the filter is increased in a specific space, and the urea solution can be quickly added to the urea tank without increasing the number of filter meshes, preventing large particles of impurities from entering the urea tank, and improving the cleaning and maintenance cycle of the filter. At the same time, the polygonal filter structure and the conical filter at the bottom of the filling filter play a role in breaking and separating the droplets of the urea solution added. Smaller droplets reduce the tension of the urea solution on the surface of the filter, making the urea solution pass through the filter more smoothly, which is conducive to speeding up the filling rate. When the urea solution is injected into the filling filter, most of the urea solution first passes through the conical filter at the bottom of the filling filter to break, separate and filter the droplets of the urea solution added. The urea solution that does not pass through the filter is splashed to the surrounding polygonal filter. After secondary breaking, separation and filtration at the edges of the filter, the liquid surface is separated into smaller droplets. At the same time, the liquid surface is also distributed to all directions of the polygonal filter through reflection, which increases the filter area through which the droplets pass, which is conducive to increasing the filling rate. At the same time, part of the liquid surface that contacts the polygonal filter first is first broken, separated and filtered by the edges of the filter, and the part that does not pass through the filter is reflected to the conical filter at the bottom of the filling filter, which breaks, separates and filters the secondary droplets of the urea solution. The two filters interact with each other to achieve the effect of 1+1>2, which is beneficial to increasing the filling rate, has a simple structure, is easy to produce and manufacture, has low cost and good effect, can be used for urea tanks of different volumes, is beneficial to modular production, is beneficial to mass production and manufacturing of enterprises and reduces the cost of complete vehicles.

[0013] The beneficial effects brought about by the technical solution provided by the present invention include:

[0014] The embodiment of the present invention provides a filling port filter screen of a urea tank and a vehicle. Since a third filter screen with a gradually decreasing size is arranged at the filling port, when the urea solution is injected into the filling filter screen, most of the urea solution first passes through the third filter screen to break, separate and filter the droplets of the urea solution being filled in. The urea solution that does not pass through the filter screen is splashed to the surrounding first filter screen, and is broken, separated and filtered twice by the edges of the filter screen, so that the liquid surface is separated into smaller droplets. At the same time, the liquid surface is distributed to all directions of the first filter screen through reflection, thereby increasing the filter screen area through which the droplets pass, which is beneficial to improving the filling rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0016] Figure 1 A schematic diagram of the three-dimensional structure of a filling port filter provided in an embodiment of the present invention;

[0017] Figure 2 A schematic diagram of the disassembled structure of the filling port filter provided in an embodiment of the present invention;

[0018] Figure 3 A cross-sectional view of a filler port filter provided by an embodiment of the present invention;

[0019] Figure 4 A top view of a filler port filter provided in an embodiment of the present invention.

[0020] Numbers in the figure:

[0021] 1. Filter installation flange; 2. Filter frame; 21. Inner frame; 22. Outer frame; 3. Third filter; 4. Second filter; 5. First filter. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0023] The embodiment of the present invention provides a filling port filter screen of a urea tank and a vehicle, which can solve the problem in the related art that the filling speed is mainly adjusted by adjusting the mesh number of the filter screen, and the urea filling rate may be low under a fixed mesh number.

[0024] See also Figure 1 and Figure 2 As shown, a filling port filter of a urea tank provided in an embodiment of the present invention may include: a filter mounting flange 1, which is cylindrical, and the filter mounting flange 1 is an installation and fixing structure of the filling port filter assembly, which is used to fix the filling port filter assembly on the filling port component of the urea tank to ensure the normal use of the filling port filter assembly; a filter frame 2, which is mounted on the filter mounting flange 1, and the side of the filter frame 2 is surrounded by a first filter 5, and the bottom is surrounded by a second filter 4. In this embodiment, the filter frame 2 is a polygonal filter, which is connected in sequence along the inner frame 21 and the outer frame 22, and its top is connected to the filter The filter screen is connected to the filter mounting flange 1, and the bottom is connected to the bottom polygonal skeleton. The filter screen skeleton 2 is an edge structure for supporting and fixing the filter screen, which is distributed on the circumference of the filter screen mounting flange 1, so that the entire side forms a polygonal filter screen structure, which plays the role of filtering, crushing, and sputtering separation of the injected urea solution. The top of the filter screen is connected to the filter screen mounting flange 1 and is surrounded by a filter screen to ensure that the urea solution can be completely filtered; the third filter screen 3 is installed on the side of the second filter screen 4 close to the filter screen mounting flange 1, and the cross-sectional size of the third filter screen 3 gradually decreases from the end close to the second filter screen 4 to the end away from the second filter screen 4. In this embodiment, since a third filter screen 3 with a gradually decreasing size is provided at the filling port, when the urea solution is injected into the filling filter screen, most of the urea solution first passes through the third filter screen 3 to break, separate and filter the droplets of the urea solution being injected, and the urea solution that does not pass through the filter screen is splashed to the surrounding first filter screen 5, and the liquid surface is separated into smaller droplets through secondary breaking, separation and filtration at the edges of the filter screen. At the same time, the liquid surface is also distributed to all directions of the first filter screen 5 through reflection, thereby increasing the filter screen area through which the droplets pass, which is beneficial to improving the filling rate. The filling port filter screen of the present invention has a simple structure, is easy to manufacture, has low cost and good effect, can be used for urea tanks of different volumes, is beneficial to modular production, is beneficial to mass production and manufacturing of enterprises and reduces the cost of complete vehicles.

[0025] See also Figure 3 and Figure 4As shown, in some embodiments, the cross-section of the filter skeleton 2 is polygonal, and the first filter 5 is connected in sequence along multiple edges of the filter skeleton 2. Through the polygonal design of the filter skeleton 2, the area of ​​the filter is increased in a specific space, and the urea solution is quickly added to the urea tank without increasing the number of filter meshes, which prevents large particles of impurities from entering the urea tank and improves the cleaning and maintenance cycle of the filter; the polygonal filter structure and the third filter 3 at the bottom of the filling filter play a role in breaking and separating the droplets of urea solution that are added in, and the smaller droplets reduce the tension of the urea solution on the surface of the filter, so that the urea solution passes through the filter more smoothly, which is conducive to speeding up the filling rate; when the urea solution is injected into the filling filter, most of the urea solution first passes through the third filter 3 at the bottom of the filling filter to break, separate and The urea solution that does not pass through the filter is splashed onto the surrounding polygonal filter screens, and is broken, separated and filtered for the second time by the edges of the filter screens, so that the liquid surface is separated into smaller droplets. At the same time, the liquid surface is also distributed to all directions of the polygonal filter screens through reflection, which increases the filter screen area through which the droplets pass, achieving the effect of 1+1>2, which is beneficial to improving the filling rate. At the same time, the liquid surface that partially contacts the polygonal filter screen first is broken, separated and filtered for the first time by the edges of the filter screen, and the part that does not pass through the filter screen is reflected to the third filter screen 3 at the bottom of the filling filter screen, which breaks, separates and filters the secondary droplets of the urea solution that is added. The two filters interact with each other, achieving the effect of 1+1>2, which is beneficial to improving the filling rate.

[0026] See also Figure 1 and Figure 2 As shown, in some embodiments, the filter screen skeleton 2 may include an inner layer skeleton 21 and an outer layer skeleton 22 connected in sequence, the inner layer skeleton 21 and the outer layer skeleton 22 both form a circle around the axis of the filter screen mounting flange 1, and the outer layer skeleton 22 is located on the outer layer of the inner layer skeleton 21. The bottom surface of the third filter screen 3 is circular, and the inner layer skeleton 21 is located on the circumference of the bottom surface of the third filter screen 3. The cross section of the filter screen mounting flange 1 is circular, and the outer layer skeleton 22 is located on the circumference of the cross section of the filter screen mounting flange 1. In this embodiment, the filter skeleton 2 is an edge structure for supporting and fixing the filter, including a side skeleton and a bottom skeleton. The side skeleton is divided into two layers, an inner skeleton 21 and an outer skeleton 22, which are evenly distributed on the circumference of the filter mounting flange 1, and the edges of the inner skeleton 21 are evenly distributed in the center of the outer skeleton 22; the bottom skeleton is polygonal, which is formed by connecting the inner skeleton 21 and the outer skeleton 22 in sequence, and its inner circle is a circular ring skeleton connected to each vertex, which not only ensures the structural stability of the filter skeleton 2, but also provides a mounting structure for the second filter 4 and the third filter 3 at the bottom.

[0027] See also Figure 1 and Figure 2As shown, in some embodiments, the third filter screen 3 is conical, and its bottom is installed on the second filter screen 4, with the tip facing the filter screen mounting flange 1. In this embodiment, the third filter screen 3 at the bottom is an upward conical structure filter screen fixed on the circular ring skeleton, and its conical surface is a filter screen structure, and there is no filter screen on the circular bottom plane, which is used for filtering, crushing, and sputtering separation of the injected urea solution; the second filter screen 4 is the area outside the circular ring skeleton and inside the polygonal skeleton on the filling bottom skeleton, and it and the third filter screen 3 together constitute the filtration area at the bottom of the filter screen to ensure that the urea solution can be completely filtered. When the urea solution is injected into the filling filter, most of the urea solution first passes through the third filter 3 at the bottom of the filling filter to break, separate and filter the droplets of the urea solution being filled in. The urea solution that does not pass through the filter is splashed to the surrounding polygonal filter, and is broken, separated and filtered by the edges of the filter for the second time, so that the liquid surface is separated into smaller droplets. At the same time, the liquid surface is also distributed to all directions of the polygonal filter through reflection, which increases the filter area through which the droplets pass, and is beneficial to improving the filling rate. At the same time, the liquid surface that partially contacts the polygonal filter first is broken, separated and filtered by the edges of the filter for the first time, and the part that does not pass through the filter is reflected to the third filter 3 at the bottom of the filling filter, which breaks, separates and filters the droplets of the urea solution being filled in for the second time. The two filters interact with each other, achieving the effect of 1+1>2, which is beneficial to improving the filling rate.

[0028] See also Figure 1 and Figure 2 As shown, in some embodiments, the filter skeleton 2 extends along the axial direction of the filter mounting flange 1. The axis of the third filter 3 coincides with the axis of the filter mounting flange 1. The third filter 3 is located inside the space enclosed by the first filter 5 and the second filter 4. In this embodiment, the filter skeleton 2 extends along the axial direction of the filter mounting flange 1 to form a polygon, and the third filter 3 is located inside the space enclosed by the first filter 5 and the second filter 4, and coincides with the axis of the filter mounting flange 1, so that it can contact the injected urea solution to a greater extent, thereby playing the role of breaking, separating and filtering the droplets of the injected urea solution.

[0029] See also Figure 1As shown, an embodiment of the present invention further provides a vehicle, which includes a urea tank, the urea tank includes the above-mentioned filling port filter, and the filling port filter may include: a filter mounting flange 1; a filter frame 2, which is mounted on the filter mounting flange 1, the side of the filter frame 2 is surrounded by a first filter 5, and the bottom is surrounded by a second filter 4. In this embodiment, the filter frame 2 is a polygonal filter, which is connected along the inner layer frame 21 and the outer layer frame 22 in sequence, and its bottom and top are respectively connected to the bottom polygonal frame and the filter mounting flange 1, so that the entire side forms a polygonal filter structure, which plays the role of filtering, crushing, and sputtering separation of the urea solution injected. The connection between the top and the filter mounting flange 1 is surrounded by a filter to ensure that the urea solution can be completely filtered; a third filter 3, which is mounted on the side of the second filter 4 close to the filter mounting flange 1, and the cross-sectional size of the third filter 3 gradually decreases from the end close to the second filter 4 to the end away from the second filter 4. In this embodiment, the filter mounting flange 1 is a mounting and fixing structure of the filling port filter assembly, which is used to fix the filling port filter assembly on the filling port component of the urea tank to ensure the normal use of the filling port filter assembly. The filter frame 2 is an edge structure for supporting and fixing the filter, which is distributed on the circumference of the filter mounting flange 1. Since a third filter 3 with a gradually decreasing size is provided at the filling port, when the urea solution is injected into the filling filter, most of the urea solution first passes through the third filter 3 to break, separate and filter the droplets of the injected urea solution. The urea solution that does not pass through the filter is splashed to the surrounding first filter 5, and is broken, separated and filtered by the edges of the filter to separate the liquid surface into smaller droplets. At the same time, the liquid surface is also distributed to all directions of the first filter 5 through reflection, thereby increasing the filter area through which the droplets pass, which is beneficial to improving the filling rate.

[0030] The principle of a urea tank filling port filter and a vehicle provided by an embodiment of the present invention is as follows:

[0031] The filling port filter of the present invention comprises: a filter mounting flange 1, a filter frame 2, a first filter 5 on the side, a second filter 4 at the bottom and a third filter 3 at the bottom. Among them, the filter frame 2 is an edge structure for supporting and fixing the filter, including a side frame and a bottom frame, and the side frame is divided into an outer frame 22 and an inner frame 21, which are respectively evenly distributed on the circumference of the filter mounting flange 1, and the edges of the inner frame 21 are evenly distributed at the center of the outer frame 22; the bottom frame is polygonal, which is formed by connecting the outer frame 22 and the inner frame 21 in sequence, and its inner circle is a circular ring frame connected to each vertex, which not only ensures the structural stability of the filter frame 2, but also provides a mounting structure for the second filter 4 and the third filter 3; the third filter 3 is an upward conical structure filter fixed on the circular ring frame, and its cone surface is a filter structure, and the circular bottom The plane has no filter, and is used to filter, crush, and sputter the urea solution that is added; the second filter 4 is the area outside the circular frame and inside the polygonal frame on the filling bottom frame, and it and the third filter 3 together form the filtering area at the bottom of the filter, ensuring that the urea solution can be completely filtered; the first filter 5 is a filter connected in sequence along the outer layer frame and the inner layer frame, and its bottom and top are respectively connected to the bottom polygonal frame and the filter mounting flange 1, so that the entire side forms a polygonal filter structure, which plays the role of filtering, crushing, and sputtering separation of the urea solution that is added, and the top of the filter and the filter mounting flange 1 are connected with the filter to ensure that the urea solution can be completely filtered. The filling port filter of the present invention has a simple structure, is easy to produce, has low cost, and has good effect. It can be used for urea tanks of different volumes, is conducive to modular production, is conducive to mass production and manufacturing of enterprises, and reduces the cost of the whole vehicle. In addition, it can also be used in other liquid filling and filtering fields, such as the fuel tank filling port.

[0032] The polygonal design of the filter frame 2 increases the area of ​​the filter in a specific space, and the urea solution can be quickly added to the urea tank without increasing the number of filter meshes, preventing large particles of impurities from entering the urea tank, and improving the cleaning and maintenance cycle of the filter. At the same time, the polygonal filter structure and the conical filter at the bottom of the filling filter play a role in breaking and separating the droplets of the urea solution being added. Smaller droplets reduce the tension of the urea solution on the filter surface, making the urea solution pass through the filter more smoothly, which is conducive to accelerating the filling rate. When the urea solution is injected into the filling filter, most of the urea solution first passes through the conical filter at the bottom of the filling filter to break, separate and filter the droplets of the urea solution being injected. The urea solution that does not pass through the filter is splashed to the surrounding polygonal filter, and is broken, separated and filtered by the edges of the filter for the second time, so that the liquid surface is separated into smaller droplets. At the same time, the liquid surface is also distributed to all directions of the polygonal filter through reflection, which increases the filter area through which the droplets pass, and is beneficial to improving the filling rate. At the same time, part of the liquid surface that first contacts the polygonal filter is first broken, separated and filtered by the edges of the filter, and the part that does not pass through the filter is reflected to the conical filter at the bottom of the filling filter, which breaks, separates and filters the droplets of the urea solution injected for the second time. The two filters interact with each other, achieving the effect of 1+1>2, which is beneficial to improving the filling rate.

[0033] In the description of the present invention, it should be noted that the terms "upper", "lower", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as a limitation on the present invention. Unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be a connection between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0034] It should be noted that, in the present invention, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0035] The foregoing is merely a specific embodiment of the present invention, which enables those skilled in the art to understand or implement the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A urea tank filling port filter, characterized in that: It includes: Filter mounting flange (1); A filter frame (2) is mounted on the filter mounting flange (1), wherein the side of the filter frame (2) is surrounded by a first filter (5), and the bottom is surrounded by a second filter (4); A third filter screen (3) is mounted on a side of the second filter screen (4) close to the filter screen mounting flange (1), wherein the cross-sectional dimensions of the third filter screen (3) gradually decrease from an end close to the second filter screen (4) to an end away from the second filter screen (4); The cross section of the filter screen skeleton (2) is polygonal, and the first filter screen (5) is formed by sequentially connecting multiple sides of the filter screen skeleton (2).

2. The urea tank filling port filter according to claim 1, characterized in that: The filter screen skeleton (2) comprises an inner layer skeleton (21) and an outer layer skeleton (22) which are connected in sequence, wherein the inner layer skeleton (21) and the outer layer skeleton (22) both form a circle around the axis of the filter screen mounting flange (1), and the outer layer skeleton (22) is located on the outer layer of the inner layer skeleton (21).

3. The urea tank filling port filter according to claim 2, characterized in that: The bottom surface of the third filter screen (3) is circular, and the inner layer skeleton (21) is located on the circumference of the bottom surface of the third filter screen (3).

4. The urea tank filling port filter according to claim 2, characterized in that: The cross section of the filter screen mounting flange (1) is circular, and the outer layer skeleton (22) is located on the circumference of the cross section of the filter screen mounting flange (1).

5. The urea tank filling port filter according to claim 1, characterized in that: The third filter screen (3) is conical in shape, with its bottom portion mounted on the second filter screen (4) and its tip facing the filter screen mounting flange (1).

6. The urea tank filling port filter according to claim 1, characterized in that: The filter screen frame (2) extends along the axial direction of the filter screen mounting flange (1).

7. The urea tank filling port filter according to claim 1, characterized in that: The axis of the third filter screen (3) coincides with the axis of the filter screen mounting flange (1).

8. The urea tank filling port filter according to claim 1, characterized in that: The third filter screen (3) is located inside the space enclosed by the first filter screen (5) and the second filter screen (4).

9. A car, characterized in that: It comprises a urea tank, and the urea tank comprises the filling port filter according to any one of claims 1 to 8.

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