Filter element structure for filtering fluid medium

Abstract

The utility model provides a filter element structure for filtering a fluid medium, the filter element structure is used for being arranged in a cavity of a base, and the base is provided with a liquid inlet pipe and a liquid outlet pipe which are communicated with the cavity; the filter element structure comprises a binding face used for being attached to the inner wall of a base, and a liquid inlet is formed in the binding face and used for being communicated with a liquid inlet pipe. A filtering surface is arranged on the edge of the binding surface, and the filtering surface and the binding surface are enclosed to form a column body; the filtering surface is used for filtering a fluid medium, and a gap is reserved between the filtering surface and the inner wall of the base; a bottom surface is arranged at the bottom of the column body, and the bottom surface and the column body enclose to form a filter cartridge; the top of the filter cartridge is used for being connected with a base. The binding surface is attached to the inner wall of the base, so that the liquid inlet is communicated with the liquid inlet pipe, and the binding surface disperses a fluid medium and then filters the fluid medium, so that the risk of local blockage is reduced; and a gap is reserved between the filtering surface and the inner wall of the base to form a filtering space, so that particles can be intercepted, particle retention can be reduced, and the possibility of blockage of the filter element is further reduced.

Description

Technical Field

[0001] The utility model relates to a filter element, in particular to a filter element structure used for filtering fluid media. Background Art

[0002] When filtering a fluid medium, a filter is usually set on the path that the fluid medium must pass through to filter out impurities in the fluid medium. A traditional filter includes a base and a filter element. The filter element is installed in the base. The fluid medium enters the inner cavity of the filter element from the liquid inlet on the top of the filter element. After being filtered by the filter layer, the fluid medium enters the area between the filter element and the base and is discharged from the discharge port on the base. In actual applications, the filter holes are usually small because most of the fluid medium is filtered through the filter holes at the bottom of the filter element, and the filtered impurities are also accumulated at the bottom of the filter element, making the filter holes at the bottom of the filter element very easy to clog. The clogged filter holes are not easy to clean. Once the filter holes at the bottom of the filter element are clogged, the filtration efficiency is significantly reduced. Utility Model Content

[0003] The utility model aims to provide a filter element structure for filtering fluid medium, and the technical problem to be solved is to reduce the clogging of the filter element.

[0004] The utility model is realized by the following technical solutions:

[0005] A filter element structure for filtering a fluid medium, the filter element structure is used to be arranged in a chamber of a base, and the base is provided with a liquid inlet pipe and a liquid outlet pipe connected to the chamber;

[0006] The filter element structure comprises a fitting surface for fitting to the inner wall of the base, and a liquid inlet is arranged on the fitting surface, and the liquid inlet is used to connect to the liquid inlet pipe;

[0007] A filtering surface is provided on the edge of the above-mentioned bonding surface, and the above-mentioned filtering surface and the bonding surface are surrounded to form a column;

[0008] The filter surface is used to filter the fluid medium, and a gap is left between the filter surface and the inner wall of the base;

[0009] The bottom of the column is provided with a bottom surface, and the bottom surface and the column are combined to form a filter cartridge;

[0010] The top of the filter cartridge is used to be connected to the base.

[0011] The above-mentioned fitting surface can fit tightly to the inner wall of the base, and by fitting to the inner wall of the base, the liquid inlet is directly connected to the liquid inlet pipe, ensuring a smooth flow path of the fluid medium; the fitting surface allows the fluid medium to be first dispersed onto the filter surface after entering the filter element, and then filtered, thereby avoiding excessive accumulation of impurities on the local part of the filter surface, thereby reducing the risk of local blockage of the filter element; reducing the generation of turbulence and vortices is also conducive to preventing blockage of the filter element caused by particle deposition.

[0012] The filter surface is responsible for fine filtering of the fluid medium. The design of leaving a gap between the filter surface and the inner wall of the base helps to form a relatively open filtering space, which can effectively intercept solid particles and reduce the particle retention caused by the contact between the filter surface and the inner wall, further reducing the possibility of filter element clogging;

[0013] The above-mentioned column is formed by a fitting surface and a filtering surface. The filtering surface is vertically arranged. The filtered impurities move to the bottom of the column under the action of gravity, which solves the problem of blockage caused by impurity accumulation. The bottom surface of the bottom of the filter cartridge is enclosed by the column, which ensures the overall strength of the filter element, makes the filter element not easy to deform during operation, maintains stable filtering performance, and indirectly reduces the risk of filter element blockage from the perspective of structural stability.

[0014] To facilitate the installation and replacement of the filter element, connect the top of the filter cartridge to the base. When the impurities in the filter element accumulate to a certain extent, clean or replace the filter element in time to ensure the continuous and efficient operation of the filtration system.

[0015] Furthermore, the area on the filter surface close to the top wall of the filter cartridge is the first buffer zone, the area close to the bottom wall of the filter cartridge is the second buffer zone, and the area between the first buffer zone and the second buffer zone is the filter zone;

[0016] The filter area is provided with a plurality of filter holes for filtering the fluid medium.

[0017] In order to prevent the fluid medium from seeping out of the base through the connecting gap between the top wall of the filter cartridge and the base, no filter holes are set in the area close to the top wall of the filter cartridge, and this area is used as a first buffer zone. The function of the first buffer zone is to prevent the filter holes from being too close to the top wall of the filter cartridge. If the first buffer zone is not set, when the fluid medium fills the filter cartridge, the fluid medium may flow out from the filter holes close to the top wall of the filter cartridge. The outflowing fluid medium is close to the connecting gap between the top wall of the filter cartridge and the base, and thus seeps out of the base through the connecting gap.

[0018] The above-mentioned fitting surface is used to initially disperse the fluid medium entering the filter cartridge. The fluid medium flows along the fitting surface to the second buffer zone. The second buffer zone performs secondary dispersion and steady flow on the fluid medium, which can cause the particles in the fluid medium to initially settle. The settled fluid medium then flows to the filter area, thereby reducing the possibility of clogging of the filter holes. When the fluid medium fills the filter cartridge, the first buffer zone disperses the fluid medium three times.

[0019] The above-mentioned filter area is provided with a plurality of filter holes for fine filtering of the fluid medium. Due to the pretreatment of the upper fitting surface and the second buffer zone, the flow of the fluid medium in this area is more uniform and gentle, which is conducive to improving the filtering efficiency and reducing the risk of clogging.

[0020] Therefore, this partitioned and graded filtration design not only improves the overall filtration efficiency of the filter element, but also significantly reduces the probability of clogging in different parts of the filter element, ensuring the long-term stable and efficient operation of the filtration system.

[0021] Further, the above-mentioned filter area includes a first filter area and a second filter area;

[0022] The first filter area is located above the upper edge of the fitting surface, and the second filter area is located between the left edge and the right edge of the fitting surface.

[0023] The above-mentioned second filter zone is located between the left and right edges of the fitting surface, forming a relatively wide and continuous filter area. The second filter zone has a large filter area and dense filter holes, and is mainly responsible for the task of deep and fine filtering of the fluid medium; the first filter zone is located above the second filter zone. When the liquid level of the fluid medium in the filter cartridge reaches the first filter zone, the first filter zone will be used for auxiliary filtration.

[0024] Furthermore, the above-mentioned filter area also includes a third filter area, and the third filter area is located below the lower edge of the fitting surface.

[0025] The above-mentioned third filter zone is located below the second filter zone. During the entire filtering process, the third filter zone is always in a filtering state. When the liquid level of the fluid medium in the filter cartridge does not reach the second filter zone, the third filter zone serves as the only filter zone; when the liquid level of the fluid medium in the filter cartridge reaches the second filter zone, the third filter zone serves as an auxiliary filter zone of the second filter zone; when the liquid level of the fluid medium in the filter cartridge reaches the first filter zone, the first filter zone and the third filter zone both serve as auxiliary filter zones of the second filter zone.

[0026] Furthermore, the bottom surface is connected to the second buffer zone of the filter surface.

[0027] The second buffer zone is not provided with filtering holes to enhance the connection strength between the bottom surface and the second buffer zone.

[0028] Furthermore, the area on the above-mentioned fitting surface close to the top wall of the filter cartridge is the third buffer zone, and the area close to the bottom wall of the filter cartridge is the fourth buffer zone;

[0029] The third buffer zone on the bonding surface is connected to the first buffer zone on the filtering surface;

[0030] The fourth buffer zone on the fitting surface is connected to the second buffer zone on the filtering surface.

[0031] To ensure the stability of the connection between the filter element and the base, the liquid inlet is not set in the area close to the top wall of the filter cartridge, and this area is used as a third buffer zone. The function of the third buffer zone is to prevent the liquid inlet from being too close to the top wall of the filter cartridge. If the third buffer zone is not set, when the fluid medium enters the filter cartridge from the liquid inlet, the impact force of the fluid medium may affect the stability of the connection between the filter element and the base.

[0032] Furthermore, the bottom surface is connected to the second buffer zone of the filtering surface and the fourth buffer zone of the fitting surface.

[0033] Furthermore, a filter screen is provided on the inner wall of the filter cartridge, and the mesh diameter of the filter screen is smaller than the diameter of the filter hole.

[0034] The filter cartridge is used as a support for the filter screen, the filter hole is used as a channel for the fluid medium to flow out of the filter cartridge, and the filter screen is used for filtering. When the filter screen is blocked, it can be directly replaced to reduce costs.

[0035] Compared with the prior art, the utility model has the following advantages and beneficial effects:

[0036] The above-mentioned fitting surface can fit tightly to the inner wall of the base, and by fitting to the inner wall of the base, the liquid inlet is directly connected to the liquid inlet pipe, ensuring a smooth flow path of the fluid medium; the fitting surface allows the fluid medium to be first dispersed onto the filter surface after entering the filter element, and then filtered, thereby avoiding excessive accumulation of impurities on the local part of the filter surface, thereby reducing the risk of local blockage of the filter element; reducing the generation of turbulence and vortices is also conducive to preventing blockage of the filter element caused by particle deposition.

[0037] The filter surface is responsible for fine filtering of the fluid medium. The design of leaving a gap between the filter surface and the inner wall of the base helps to form a relatively open filtering space, which can effectively intercept solid particles and reduce the particle retention caused by the contact between the filter surface and the inner wall, further reducing the possibility of filter element clogging;

[0038] The above-mentioned column is formed by a fitting surface and a filtering surface. The filtering surface is vertically arranged. The filtered impurities move to the bottom of the column under the action of gravity, which solves the problem of blockage caused by impurity accumulation; the bottom surface of the bottom of the filter cartridge is enclosed by the column, which ensures the overall strength of the filter element, makes the filter element not easy to deform during operation, maintains stable filtering performance, and indirectly reduces the risk of filter element blockage from the perspective of structural stability; there are no filtering holes on the bottom surface, which is convenient for cleaning. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the technical solutions of the exemplary embodiments of the present utility model, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present utility model, and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work. In the drawings:

[0040] Figure 1 A schematic diagram of the structure provided for Example 1;

[0041] Figure 2 Another structural schematic diagram provided for Example 1;

[0042] Figure 3 A schematic diagram of the structure provided for Example 2;

[0043] Figure 4 Another structural schematic diagram provided for Example 2;

[0044] Figure 5 A schematic diagram of the structure provided for Example 3;

[0045] Figure 6 This is a schematic diagram of the structure provided for Example 4.

[0046] Marks and corresponding parts names in the attached drawings:

[0047] 10. Fitting surface; 11. Third buffer zone; 12. Fourth buffer zone; 20. Filtering surface; 21. First buffer zone; 22. Second buffer zone; 23. Filtering area; 24. Filtering holes; 25. First filtration area; 26. Second filtration area; 27. Third filtration area; 30. Liquid inlet; 40. Bottom surface. DETAILED DESCRIPTION

[0048] In order to make the purpose, technical solutions and advantages of the utility model more clearly understood, the utility model is further described in detail below in conjunction with embodiments and drawings. The schematic implementation manner of the utility model and its description are only used to explain the utility model and are not intended to limit the utility model.

[0049] The fluid medium is usually a thicker liquid, such as lubricating oil.

[0050] Example 1

[0051] This embodiment 1 provides a filter element structure for filtering a fluid medium, the filter element structure is used to be arranged in a chamber of a base, and the base is provided with a liquid inlet pipe and a liquid outlet pipe connected to the chamber;

[0052] The filter element structure comprises a fitting surface 10 for fitting against the inner wall of the base, and a liquid inlet 30 is provided on the fitting surface 10, and the liquid inlet 30 is used to connect to the liquid inlet pipe;

[0053] A filter surface 20 is disposed on the edge of the above-mentioned bonding surface 10, and the above-mentioned filter surface 20 and the bonding surface 10 are surrounded to form a column;

[0054] The filter surface 20 is used to filter the fluid medium, and a gap is left between the filter surface 20 and the inner wall of the base;

[0055] The bottom of the column is provided with a bottom surface 40, and the bottom surface 40 and the column are combined to form a filter cartridge;

[0056] The top of the filter cartridge is used to be connected to the base.

[0057] The above-mentioned fitting surface 10 can fit tightly against the inner wall of the base. By fitting against the inner wall of the base, the liquid inlet 30 is directly connected to the liquid inlet pipe, ensuring a smooth flow path of the fluid medium. The fitting surface 10 allows the fluid medium to be first dispersed onto the filter surface 20 after entering the filter element, and then filtered, thereby avoiding excessive accumulation of impurities on the local area of ​​the filter surface 20, thereby reducing the risk of local blockage of the filter element; reducing the generation of turbulence and vortices is also conducive to preventing blockage of the filter element caused by particle deposition.

[0058] The filter surface 20 is responsible for fine filtering of the fluid medium. The design of leaving a gap between the filter surface 20 and the inner wall of the base helps to form a relatively open filtering space, which can effectively intercept solid particles and reduce the particle retention caused by the contact between the filter surface and the inner wall, further reducing the possibility of clogging of the filter element.

[0059] The above-mentioned column is formed by the fitting surface 10 and the filtering surface 20. The filtering surface 20 is arranged vertically. The filtered impurities move to the bottom of the column under the action of gravity, which solves the problem of blockage caused by impurity accumulation; the bottom surface 40 of the bottom of the filter cartridge is enclosed by the column, which ensures the overall strength of the filter element, makes the filter element not easy to deform during operation, maintains stable filtering performance, and indirectly reduces the risk of filter element blockage from the perspective of structural stability; the bottom surface 40 can be provided with a filter hole 24 to increase the filtering area, or the filter hole 24 can be not provided to avoid tiny impurities from being stuck in the filter hole 24, which is convenient for cleaning, and technicians can choose by themselves.

[0060] To facilitate the installation and replacement of the filter element, connect the top of the filter cartridge to the base. When the impurities in the filter element accumulate to a certain extent, clean or replace the filter element in time to ensure the continuous and efficient operation of the filtration system.

[0061] In a specific embodiment, the area on the filter surface 20 close to the top wall of the filter cartridge is the first buffer zone 21, the area close to the bottom wall of the filter cartridge is the second buffer zone 22, and the area between the first buffer zone 21 and the second buffer zone 22 is the filter zone 23;

[0062] The filter area 23 is provided with a plurality of filter holes 24 for filtering the fluid medium.

[0063] In order to prevent the fluid medium from seeping out of the base through the connecting gap between the top wall of the filter cartridge and the base, no filter hole 24 is set in the area close to the top wall of the filter cartridge, and this area is used as the first buffer zone 21. The function of the first buffer zone 21 is to prevent the filter hole 24 from being too close to the top wall of the filter cartridge. If the first buffer zone 21 is not set, when the fluid medium fills the filter cartridge, the fluid medium may flow out from the filter hole 24 close to the top wall of the filter cartridge. The outflowing fluid medium is close to the connecting gap between the top wall of the filter cartridge and the base, and thus seeps out of the base through the connecting gap.

[0064] The above-mentioned fitting surface 10 is used to initially disperse the fluid medium entering the filter cartridge. The fluid medium flows along the fitting surface 10 to the second buffer zone 22. The second buffer zone 22 performs secondary dispersion and steady flow on the fluid medium, which can make the particles in the fluid medium initially settle, and then the settled fluid medium flows to the filter area 23, thereby reducing the possibility of clogging of the filter hole 24. When the fluid medium fills the filter cartridge, the first buffer zone 21 disperses the fluid medium tertiary.

[0065] The filtration area 23 is provided with a plurality of filtration holes 24 for fine filtration of the fluid medium. Due to the pretreatment of the upper fitting surface 10 and the second buffer zone 22, the flow of the fluid medium in this area is more uniform and gentle, which is beneficial to improving the filtration efficiency and reducing the risk of clogging.

[0066] Therefore, this partitioned and graded filtration design not only improves the overall filtration efficiency of the filter element, but also significantly reduces the probability of clogging in different parts of the filter element, ensuring the long-term stable and efficient operation of the filtration system.

[0067] A specific layout example is as follows: the filtering surface 20 is arranged around the fitting surface 10, a first buffer zone 21 is arranged at the upper edge of the fitting surface 10, a second buffer zone 22 is arranged at the lower edge of the fitting surface 10, and the left edge and the right edge are connected by the filtering area 23. At this time, the bottom surface 40 is connected to the second buffer zone 22 of the filtering surface 20. Figure 2 As shown, the second buffer area 22 is not provided with the filter hole 24 to enhance the connection strength of the bottom surface 40; or, the filter surface 20 is provided at the left edge and the right edge of the fitting surface 10, and the left edge and the right edge are connected by the first buffer area 21, the second buffer area 22 and the filter area 23. At this time, the bottom surface 40 is connected to the second buffer area 22 of the filter surface 20 and the lower edge of the fitting surface 10, as shown in FIG. Figure 1 As shown, neither the second buffer area 22 nor the fitting surface 10 is provided with the filter hole 24 to enhance the connection strength of the bottom surface 40 .

[0068] Example 2

[0069] The difference from the embodiment 1 is that the filter area 23 includes a first filter area 25 and a second filter area 26;

[0070] The first filter area 25 is located above the upper edge of the fitting surface 10 , and the second filter area 26 is located between the left edge and the right edge of the fitting surface 10 .

[0071] The above-mentioned second filter area 26 is located between the left edge and the right edge of the fitting surface 10, forming a relatively wide and continuous filter area 23. The second filter area 26 has a large filter surface 20 and dense filter holes 24, and is mainly responsible for the task of deep and fine filtering of the fluid medium; the first filter area 25 is located above the second filter area 26. When the liquid level of the fluid medium in the filter cartridge reaches the first filter area 25, the first filter area 25 will be used for auxiliary filtration.

[0072] A specific layout example is as follows: the filter surface 20 is arranged around the fitting surface 10, the upper edge of the fitting surface 10 is provided with a first filter area 25, the lower edge is provided with a second buffer area 22, the left edge and the right edge are connected by the second filter area 26, at this time, the bottom surface 40 is connected to the second buffer area 22 of the filter surface 20, as shown in FIG. Figure 4 As shown, the second buffer zone 22 is not provided with filter holes 24 to enhance the connection strength of the bottom surface 40; or, the upper edge, left edge and right edge of the bonding surface 10 are provided with filter surfaces 20, the upper edge is provided with a first filter area 25, and the left edge and the right edge are connected by a second filter area 26. In this case, the bottom surface 40 is connected to the second buffer zone 22 of the filter surface 20 and the lower edge of the bonding surface 10, as shown in FIG. Figure 3 As shown, neither the second buffer area 22 nor the fitting surface 10 is provided with the filter hole 24 to enhance the connection strength of the bottom surface 40 .

[0073] Example 3

[0074] On the basis of Embodiment 2, the filter area 23 further includes a third filter area 27 , and the third filter area 27 is located below the lower edge of the fitting surface 10 .

[0075] The third filter zone 27 is located below the second filter zone 26. During the entire filtering process, the third filter zone 27 is always in a filtering state. When the liquid level of the fluid medium in the filter cartridge does not reach the second filter zone 26, the third filter zone 27 serves as the only filter zone 23; when the liquid level of the fluid medium in the filter cartridge reaches the second filter zone 26, the third filter zone 27 serves as an auxiliary filter zone 23 of the second filter zone 26; when the liquid level of the fluid medium in the filter cartridge reaches the first filter zone 25, the first filter zone 25 and the third filter zone 27 both serve as auxiliary filter zones 23 of the second filter zone 26.

[0076] A specific layout example is as follows: the filter surface 20 is arranged around the fitting surface 10, the upper edge of the fitting surface 10 is provided with a first filter area 25, the lower edge is provided with a third filter area 27, the left edge and the right edge are connected by a second filter area 26, at this time, the bottom surface 40 is connected to the second buffer area 22 of the filter surface 20, as shown in FIG. Figure 5 As shown, the second buffer zone 22 is not provided with the filtering hole 24 to enhance the connection strength of the bottom surface 40 .

[0077] Example 4

[0078] On the basis of Example 1, the area on the above-mentioned bonding surface 10 close to the top wall of the filter cartridge is the third buffer zone 11, and the area close to the bottom wall of the filter cartridge is the fourth buffer zone 12;

[0079] The third buffer zone 11 on the fitting surface 10 is connected to the first buffer zone 21 on the filtering surface 20;

[0080] The fourth buffer zone 12 on the fitting surface 10 is connected to the second buffer zone 22 on the filtering surface 20;

[0081] At this time, the bottom surface 40 is connected to the second buffer area 22 of the filter surface 20 and the fourth buffer area 12 of the fitting surface 10. Figure 6 As shown, neither the second buffer area 22 nor the fitting surface 10 is provided with the filter hole 24 to enhance the connection strength of the bottom surface 40 .

[0082] In order to ensure the connection stability between the filter element and the base, the liquid inlet 30 is not set in the area close to the top wall of the filter cartridge, and the area is used as the third buffer zone 11. The function of the third buffer zone 11 is to prevent the liquid inlet 30 from being too close to the top wall of the filter cartridge. If the third buffer zone 11 is not set, when the fluid medium enters the filter cartridge from the liquid inlet 30, the impact force of the fluid medium may affect the connection stability between the filter element and the base.

[0083] In a specific embodiment, a filter screen is disposed on the inner wall of the filter cartridge, and the mesh diameter of the filter screen is smaller than the diameter of the filter hole 24 .

[0084] The filter cartridge is used as a support for the filter screen, and the filter hole 24 is used as a channel for the fluid medium to flow out of the filter cartridge. The filter screen is used for filtering. When the filter screen is blocked, it can be directly replaced to reduce costs.

[0085] The specific implementation methods described above further illustrate the purpose, technical solutions and beneficial effects of the utility model in detail. It should be understood that the above description is only the specific implementation method of the utility model and is not used to limit the protection scope of the utility model. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the utility model should be included in the protection scope of the utility model.

Claims

1. A filter element structure for filtering a fluid medium, the filter element structure being arranged in a chamber of a base, the base being provided with a liquid inlet pipe and a liquid outlet pipe communicating with the chamber; It is characterized in that The filter element structure comprises a fitting surface (10) for fitting against the inner wall of a base, wherein a liquid inlet (30) is provided on the fitting surface (10), and the liquid inlet (30) is used to communicate with a liquid inlet pipe; A filtering surface (20) is provided on the edge of the fitting surface (10), and the filtering surface (20) and the fitting surface (10) are combined to form a column; The filtering surface (20) is used to filter the fluid medium, and a gap is left between the filtering surface (20) and the inner wall of the base; The bottom of the column is provided with a bottom surface (40), and the bottom surface (40) and the column are combined to form a filter cartridge; The top of the filter cartridge is used to be connected with a base.

2. A filter element structure for filtering fluid medium according to claim 1, characterized in that: The area on the filtering surface (20) close to the top wall of the filter cartridge is a first buffer area (21), the area close to the bottom wall of the filter cartridge is a second buffer area (22), and the area between the first buffer area (21) and the second buffer area (22) is a filtering area (23); The filter area (23) is provided with a plurality of filter holes (24) for filtering fluid media.

3. A filter element structure for filtering fluid medium according to claim 2, characterized in that: The filtering area (23) comprises a first filtering area (25) and a second filtering area (26); The first filter area (25) is located above the upper edge of the fitting surface (10), and the second filter area (26) is located between the left edge and the right edge of the fitting surface (10).

4. A filter element structure for filtering a fluid medium according to claim 3, characterized in that: The filtering area (23) further comprises a third filtering area (27), and the third filtering area (27) is located below the lower edge of the fitting surface (10).

5. A filter element structure for filtering fluid medium according to claim 4, characterized in that: The bottom surface (40) is connected to the second buffer zone (22) of the filter surface (20).

6. A filter element structure for filtering fluid medium according to claim 2, characterized in that: The area on the fitting surface (10) close to the top wall of the filter cartridge is a third buffer area (11), and the area close to the bottom wall of the filter cartridge is a fourth buffer area (12); The third buffer zone (11) on the fitting surface (10) is connected to the first buffer zone (21) on the filtering surface (20); The fourth buffer zone (12) on the fitting surface (10) is connected to the second buffer zone (22) on the filtering surface (20).

7. A filter element structure for filtering fluid medium according to claim 6, characterized in that: The bottom surface (40) is connected to the second buffer zone (22) of the filtering surface (20) and the fourth buffer zone (12) of the fitting surface (10).

8. The filter element structure for filtering fluid medium according to claim 1, characterized in that: The inner wall of the filter cylinder is provided with a filter screen, and the mesh diameter of the filter screen is smaller than the diameter of the filter hole (24).

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