A filter element

Abstract

The invention discloses a filter element, comprising a central tube with a mesh side wall and filter paper sleeved on the central tube side wall, an upper end cover is provided at the upper end of the central tube, an outer frame with a mesh side wall is sleeved on the outer side of the filter paper, the upper end of the outer frame is connected to the upper end cover, the upper end surface of the filter paper is sealed and connected to the lower end surface of the upper end cover, and the lower end surface of the filter paper is sealed and connected to the inner surface of the lower end of the outer frame. The filter paper is wrapped between the outer frame and the central tube, so that the outer frame and the central tube play a role in protecting the filter paper, thereby preventing the filter paper from being deformed, allowing fuel or engine oil to enter the outer frame from the side wall of the outer frame, and then enter the central tube after being filtered by the filter paper arranged between the outer frame and the central tube, thereby ensuring the filtering effect of the filter paper, and the filter paper is wrapped between the outer frame and the central tube to prevent the filter paper from being deformed, greatly improving the service life of the filter paper, and ensuring the filtering effect of the filter element.

Description

Technical Field

[0001] The present invention relates to the technical field of filters, and more specifically, to a filter element. Background Art

[0002] A filter is an accessory that filters impurities or gases through filter paper. It generally refers to automobile filters, which are engine accessories. A filter is a device that removes particulate impurities. It is used in automobiles and is connected to piston-type machinery. When the internal combustion engine or compressor is working, it prevents the inhalation of impurities such as dust to prevent the adsorption of dust and aggravated wear of parts, thereby protecting and extending the life of the internal combustion engine.

[0003] However, the filter element of the current filter still has the following shortcomings: the filter paper on the original filter element is usually fixed by a thin rope wrapped around the outer surface of the filter paper and coated with glue. This structure causes the filter paper to be easily deformed, thereby affecting the filtering effect of the filter element.

[0004] Therefore, how to solve the problem that filter paper is easily deformed is a problem that needs to be solved urgently by those skilled in the art. Summary of the invention

[0005] In view of this, an object of the present invention is to provide a filter element, which can prevent the filter paper from deforming, ensure the filtering effect of the filter element, and increase the service life of the filter paper.

[0006] In order to achieve the above object, the present invention provides the following technical solutions:

[0007] A filter element comprises a central tube with mesh side walls and filter paper sleeved on the side walls of the central tube, an upper end cover is provided at the upper end of the central tube, an outer frame with mesh side walls is sleeved on the outer side of the filter paper, the upper end of the outer frame is connected to the upper end cover, the upper end surface of the filter paper is sealed to the lower end surface of the upper end cover, and the lower end surface of the filter paper is sealed to the inner surface of the lower end of the outer frame.

[0008] Preferably, the filter paper is a pleated structure with multiple folded edges, the radial cross-section of the filter paper is serrated, and the inner wall of the outer frame is provided with a toothed groove that cooperates with the tip of the folded edge so that the toothed groove is sleeved on the outer side of the folded edge.

[0009] Preferably, a flange for inserting into the cavity formed by the folded edge is provided on the outer wall of the central tube, the end surface of the flange facing the folded edge is a plane, and the flange is inserted into the outer end of the cavity.

[0010] Preferably, the periphery of the filter paper is a pleated structure with a plurality of first arc-shaped folding units, the first arc-shaped folding unit is an arc-shaped structure protruding outward, and the outer wall of the central tube is provided with a boss for inserting into the cavity formed by the first arc-shaped folding unit, the end face of the boss facing the first arc-shaped folding unit is a plane, and the boss is inserted into the outer end of the cavity formed by the first arc-shaped folding unit.

[0011] Preferably, the filter paper is a pleated structure with a plurality of second arc-shaped folding units on the circumference, the second arc-shaped folding unit is an arc-shaped structure recessed inward, the inner wall of the outer frame is provided with a protrusion for inserting into the cavity formed by the second arc-shaped folding unit, the end face of the protrusion facing the second arc-shaped folding unit is a plane, and the protrusion is inserted into the outer end of the cavity formed by the arc-shaped folding unit.

[0012] Preferably, the side wall of the upper end cover is provided with a buckle, the upper inner wall of the outer frame is provided with a slot that cooperates with the buckle, and the upper part of the outer frame is sleeved on the side wall of the upper end cover so that the buckle is matched and connected with the slot.

[0013] Preferably, the side wall of the upper end cover is evenly distributed with diverter plates perpendicular to the side wall of the upper end cover and used for diverting flow above the buckle.

[0014] Preferably, a convex ring for inserting into the central tube and clamping with the inner wall of the central tube is provided on the inner surface of the lower end of the outer frame.

[0015] Preferably, the outer diameter of the convex ring gradually increases downward along its axial direction.

[0016] Preferably, an internal thread is provided on the inner side wall of the convex ring.

[0017] Preferably, the outer frame includes a side frame body and a lower end cover detachably connected to the lower end of the side frame body, and the convex ring is arranged on the upper surface of the lower end cover.

[0018] Preferably, the upper end surface of the filter paper and the lower end surface of the upper end cover are fixed by glue injection molding, and the lower end surface of the filter paper and the inner surface of the lower end of the outer frame are fixed by glue injection molding.

[0019] Preferably, a groove for installing the first sealing ring is provided on the inner hole of the upper end cover.

[0020] Preferably, an annular step surface for mounting a second sealing ring is provided at the outer edge of the upper end of the outer frame.

[0021] The filter element provided by the present invention comprises a central tube and an upper end cover arranged at the upper end of the central tube, the filter paper is sleeved on the side wall of the central tube, and an outer frame is also sleeved on the outer side of the filter paper, the upper end of the outer frame is fixedly connected to the upper end cover, so that the filter paper is wrapped between the outer frame and the central tube, so that the outer frame and the central tube play a role of protecting the filter paper, thereby preventing the filter paper from being deformed, and the upper end surface of the filter paper is sealed and connected to the lower end surface of the upper end cover, and the lower end surface of the filter paper is sealed and connected to the inner surface of the lower end of the outer frame, and the side walls of the outer frame and the central tube are both mesh structures, so that fuel or engine oil can enter the outer frame from the side wall of the outer frame, and then enter the central tube after being filtered by the filter paper arranged between the outer frame and the central tube, so that while ensuring the filtering effect of the filter paper, the filter paper is wrapped between the outer frame and the central tube to prevent the filter paper from being deformed, which greatly improves the service life of the filter paper and ensures the filtering effect of the filter element. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0023] Figure 1 An exploded schematic diagram of a specific embodiment of a filter element provided by the present invention;

[0024] Figure 2 for Figure 1 Schematic diagram of the middle and upper end cover and the center tube;

[0025] Figure 3 for Figure 1 Schematic diagram of filter paper;

[0026] Figure 4 It is a schematic diagram of a radial cross section of a filter element in the first embodiment;

[0027] Figure 5 is a schematic diagram of a radial cross section of a central tube in the first embodiment;

[0028] Figure 6 is a schematic diagram of a radial cross section of a filter element in a second embodiment;

[0029] Figure 7 Schematic diagram of radial cross section of filter element in the third embodiment

[0030] Figure 8 for Figure 1 A three-dimensional schematic diagram of the middle and outer frames;

[0031] Fig. 9 for Figure 1Internal schematic diagram of the middle outer frame;

[0032] Fig.10 for Figure 1 Exploded view of the center frame.

[0033] Among them, 1-upper end cover, 11-clip, 12-diverter plate, 13-groove, 2-center tube, 21-flange, 22-boss, 3-filter paper, 31-folded edge, 311-external folded edge line, 312-internal folded edge line, 32-first arc-shaped folding unit, 33-second arc-shaped folding unit, 4-outer frame, 41-slot, 42-convex ring, 43-side frame body, 44-lower end cover, 45-annular step surface, 46-internal thread, 47-toothed groove, 48-protrusion. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only 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.

[0035] The core of the present invention is to provide a filter element, which can prevent the filter paper from deforming, ensure the filtering effect of the filter element, and increase the service life of the filter paper.

[0036] Please refer to Figures 1 to 10 , Figure 1 An exploded schematic diagram of a specific embodiment of a filter element provided by the present invention; Figure 2 for Figure 1 Schematic diagram of the middle and upper end cover and the center tube; Figure 3 for Figure 1 Schematic diagram of filter paper; Figure 4 It is a schematic diagram of a radial cross section of a filter element in the first embodiment; Figure 5 is a schematic diagram of a radial cross section of a central tube in the first embodiment; Figure 6 is a schematic diagram of a radial cross section of a filter element in a second embodiment; Figure 7 is a schematic diagram of a radial cross section of a filter element in a third embodiment; Figure 8 for Figure 1 A three-dimensional schematic diagram of the middle and outer frames; Fig. 9 for Figure 1 Internal schematic diagram of the middle outer frame; Fig.10 for Figure 1 Exploded view of the center frame.

[0037] The filter element provided by the present invention comprises a central tube 2 with a mesh side wall and a filter paper 3 sleeved on the side wall of the central tube 2, an upper end cover 1 is provided at the upper end of the central tube 2, an outer frame 4 with a mesh side wall is sleeved on the outer side of the filter paper 3, the upper end of the outer frame 4 is connected to the upper end cover 1, the upper end surface of the filter paper 3 is sealed connected to the lower end surface of the upper end cover 1, and the lower end surface of the filter paper 3 is sealed connected to the inner surface of the lower end of the outer frame 4.

[0038] Among them, the center tube 2 is a cylindrical tubular structure, the upper and lower ends of the center tube 2 are open, an upper end cover 1 is provided at the upper end of the center tube 2, an inner hole is provided in the middle of the upper end cover 1, and the inner hole is connected to the center tube 2. A filter paper 3 is sleeved on the side wall of the center tube 2, and the side wall of the center tube 2 is a mesh structure, so that the fuel or engine oil filtered by the filter paper 3 flows into the center tube 2 from the side wall of the center tube 2, and then is transported to other devices by the center tube 2.

[0039] An outer frame 4 is mounted on the outer side of the filter paper 3, and the upper end of the outer frame 4 is open. The upper end of the outer frame 4 can be inserted into the outer side of the filter paper 3 from the lower end of the filter paper 3. The upper end of the outer frame 4 is connected to the upper end cover 1, and the upper end surface of the filter paper 3 is sealed to the lower end surface of the upper end cover 1, and the lower end surface of the filter paper 3 is sealed to the inner surface of the lower end of the outer frame 4. The side wall of the outer frame 4 is a mesh structure, so that the fuel or engine oil enters the outer frame 4 from the mesh holes of the side wall of the outer frame 4, and then enters the central tube 2 after being filtered by the filter paper 3.

[0040] Therefore, the filter element provided by the present invention comprises a central tube 2 and an upper end cover 1 arranged at the upper end of the central tube 2, the filter paper 3 is sleeved on the side wall of the central tube 2, and the outer side of the filter paper 3 is also sleeved with an outer frame 4, the upper end of the outer frame 4 is fixedly connected to the upper end cover 1, so that the filter paper 3 is wrapped between the outer frame 4 and the central tube 2, so that the outer frame 4 and the central tube 2 play a role in protecting the filter paper 3, thereby preventing the filter paper 3 from being deformed, and the upper end surface of the filter paper 3 is sealed and connected to the lower end surface of the upper end cover 1, and the filter paper 3 is sealed. The seal on the lower end surface of the paper 3 is connected to the inner surface of the lower end of the outer frame 4. The side walls of the outer frame 4 and the central tube 2 are both mesh structures, so that the fuel or engine oil can enter the outer frame 4 from the side wall of the outer frame 4, and then enter the central tube 2 after being filtered by the filter paper 3 arranged between the outer frame 4 and the central tube 2. Therefore, while ensuring the filtering effect of the filter paper 3, the filter paper 3 is wrapped between the outer frame 4 and the central tube 2 to prevent the filter paper 3 from deformation, which greatly improves the service life of the filter paper 3 and ensures the filtering effect of the filter element.

[0041] In the present invention, the filter paper 3 can be of various shapes and structures. According to the different shapes of the filter paper 3, the outer frame 4 and the central tube 2 can also be provided with various auxiliary structures to further prevent the filter paper 3 from deformation and extend the service life of the filter paper 3.

[0042] In the first embodiment of the filter paper, the filter paper 3 is a pleated structure with a plurality of folded edges 31, the radial cross-section of the filter paper 3 is serrated, and a toothed groove 47 matching the tip of the folded edge 31 is provided on the inner wall of the outer frame 4 so that the toothed groove 47 is sleeved on the outer side of the folded edge 31.

[0043] like Figure 4 As shown, the filter paper 3 is a folded structure with a plurality of folded edges 31 formed by folding, and the inner and outer sides of the radial cross section of the filter paper are serrated. Due to the presence of folds, the filter paper 3 of this structure greatly increases the filtration area, thereby having a better filtration efficiency. However, after long-term use, due to the non-uniform accumulation of impurities, the folded edges 31 are easily deformed in the circumferential direction, resulting in a decrease in the filtration efficiency of the filter paper 3. In order to increase the anti-deformation ability of the folded edges 31 in the circumferential direction, a folded structure with the same shape as the filter paper 3 can be provided on the outer frame 4, that is, a toothed groove 47 matched with the tip of the folded edge 31 is provided on the inner wall of the outer frame 4, so that the folded edges 31 on the outer side of the filter paper 3 can be sleeved in the toothed groove 47 of the outer frame 4, thereby limiting the range of motion of the folded edges 31 on the outer side of the filter paper 3, so that the folded edges 31 on the outer side of the filter paper 3 can be effectively prevented from deforming in the circumferential direction.

[0044] However, the outer frame 4 constructed as above also has the following disadvantages: first, the material used for the outer frame 4 will increase significantly, which is not economical; second, after long-term use, the folded edge 31 of the filter paper 3 may stick to the toothed groove 47 of the outer frame 4 on the contact surface at some local positions, causing the mesh holes of the side wall of the outer frame 4 to be blocked, thereby causing the filtration efficiency at this local position to decrease, and even due to excessive local pressure, the filter paper 3 at this position may be damaged and lose the filtering effect.

[0045] In order to prevent the above situation, preferably, the toothed groove 47 is only set on the tip of the folded edge 31, that is, the space formed by the toothed groove 47 on the outer frame 4 can only wrap a part of the folded edge 31 of the filter paper 3. The filter paper 3 has an external folded edge line 311 and an internal folded edge line 312, and the gap between the external folded edge line 311 and the internal folded edge line 312 in the radial direction is L. The toothed groove 47 wraps the tip of the folded edge 31 of the filter paper 3. At this time, the gap between the toothed groove 47 and the main surface of the outer frame 4 is less than L. After the outer frame 4 is constructed into this structure, on the one hand, the material is saved, and on the other hand, even if the folded edge 31 of the filter paper 3 and the toothed groove 47 of the outer frame 4 adhere to each other on the contact surface, the fuel or oil can also enter the inner part of the outer frame 4 from the main surface area of ​​the outer frame 4, and then pass through the filter paper 3, and the problem of excessive local pressure will not occur. More preferably, the gap between the toothed groove 47 and the main surface of the outer frame 4 is less than half of L.

[0046] Furthermore, a flange 21 for inserting into the cavity formed by the folded edge 31 is provided on the outer wall of the central tube 2. The end surface of the flange 21 facing the folded edge 31 is a plane, and the flange 21 is inserted into the outer end of the cavity.

[0047] The central tube 2 may also be constructed into a pleated structure with the same shape as the filter paper 3, that is, a flange 21 for inserting into the cavity formed by the folded edge 31 is provided on the outer wall of the central tube 2, and the flange 21 is inserted into the space formed by the folded edge 31 of the filter paper 3 to prevent the folded edge 31 of the filter paper 3 from deforming in the circumferential direction. For the same reason as above, preferably, Figure 5 As shown, the end face of the flange 21 of the central tube 2 facing the folded edge 31 is a plane, and this plane only occupies part of the space after being inserted into the space formed by the folded edge 31 of the filter paper 3. Therefore, after the central tube 2 is constructed into the above structure, the problem of excessive local pressure can also be avoided.

[0048] In the second embodiment of filter paper, the periphery of the filter paper 3 is a pleated structure with multiple first arc-shaped folding units 32, the first arc-shaped folding unit 32 is an arc-shaped structure protruding to the outside, and the outer wall of the central tube 2 is provided with a boss 22 for inserting into the cavity formed by the first arc-shaped folding unit 32, the end face of the boss 22 facing the first arc-shaped folding unit 32 is a plane, and the boss 22 is inserted into the outer end of the cavity formed by the first arc-shaped folding unit 32.

[0049] like Figure 6 As shown, the filter paper 3 is a pleated structure with a plurality of first arc-shaped folding units 32 formed on the circumference after folding. The first arc-shaped folding unit 32 of the filter paper 3 is an arc-shaped structure protruding outward, and the radial cross section of the filter paper 3 is a wavy circle. When the fuel or engine oil passes through the filter paper 3 from the inside of the outer frame 4, pressure is applied to the first arc-shaped folding unit on the filter paper 3, and the first arc-shaped structure can conduct and diffuse the pressure on a certain point to the entire structure. Therefore, the pressure on each point on the filter paper 3 is relatively balanced, thereby avoiding deformation caused by excessive local pressure.

[0050] In order to further enhance the deformation resistance of the filter paper 3, the central tube 2 can also be constructed into a pleated structure, that is, a boss 22 for inserting into the cavity formed by the first arc-shaped folding unit 32 is provided on the outer wall of the central tube 2, and the end face of the boss 22 facing the first arc-shaped folding unit 32 is a plane, which enters the space formed by the arc-shaped folding unit 32, but only occupies part of the space, so that the first arc-shaped folding unit 32 of the filter paper 3 and the boss 22 of the central tube 2 can be prevented from adhering to each other on the contact surface. The outer frame 4 is still cylindrical, such as Figure 6 As shown in FIG6A , a certain space may be reserved between the side wall of the outer frame 4 and the filter paper 3. However, Figure 6As shown in FIG6B , if the side wall of the outer frame 4 is arranged to fit with the filter paper 3 to form a contact surface, and even the filter paper 3 is slightly deformed to a certain extent, the anti-deformation performance of the filter paper 3 can be further enhanced.

[0051] In the third embodiment of the filter paper 3, the filter paper 3 is a pleated structure with a plurality of second arc-shaped folding units 33 on the circumference, the second arc-shaped folding unit 33 is an arc-shaped structure recessed inward, and a protrusion 48 for inserting into the cavity formed by the second arc-shaped folding unit 33 is provided on the inner wall of the outer frame 4, the end face of the protrusion 48 facing the second arc-shaped folding unit 33 is a plane, and the protrusion 48 is inserted into the outer end of the cavity formed by the second arc-shaped folding unit 33.

[0052] like Figure 7 As shown, the filter paper 3 is a pleated structure with a plurality of second arc-shaped folding units 33 on the circumference formed by folding. Different from the previous embodiment, the arc-shaped folding unit 32 of the filter paper 3 is an arc-shaped structure recessed inward. Similar to the previous embodiment, the structure of the filter paper 3 in this embodiment can also achieve the effect of balanced force at each point, thereby avoiding deformation caused by excessive local pressure. In order to further enhance the deformation resistance of the filter paper 3, a protrusion 48 for inserting into the cavity formed by the second arc-shaped folding unit 33 is provided on the inner wall of the outer frame 4. The end face of the protrusion 48 facing the second arc-shaped folding unit 33 is a plane. The protrusion 48 on the inner wall of the outer frame 4 is inserted into the cavity formed by the second arc-shaped folding unit 33, thereby forming a certain limiting effect on the filter paper 3 and preventing the filter paper 3 from deformation. In addition, the central tube 2 is still cylindrical, as shown in FIG. Figure 7 As shown in FIG. 7A , a certain space can be reserved between the central tube 2 and the filter paper 3. However, Figure 7 As shown in FIG7B , if the central tube 2 is arranged to fit with the filter paper 3 to form a contact surface, or even to cause a certain slight deformation of the filter paper 3, the anti-deformation performance of the filter paper 3 can be further enhanced.

[0053] On the basis of the above embodiments, considering the setting of the connection mode between the outer frame 4 and the upper end cover 1, preferably, a buckle 11 can be provided on the side wall of the upper end cover 1, and correspondingly, a slot 41 matching with the buckle 11 is provided on the upper inner wall of the outer frame 4, and the upper part of the outer frame 4 is sleeved on the side wall of the upper end cover 1, so that the buckle 11 is matched with the slot 41 and the buckle 11 is inserted into the slot 41, so that the outer frame 4 is fixedly connected to the upper end cover 1. Of course, the upper end cover 1 and the outer frame 4 can also be connected and fixed by other connection modes, for example, by bolts or threaded connection modes. It should be pointed out that the upper end cover 1 and the outer frame 4 should be connected in a detachable manner to facilitate the installation and replacement of the filter element.

[0054] On the basis of the above-mentioned embodiment, in order to improve the smoothness of the fuel or engine oil flowing through the side wall of the upper end cover 1, preferably, the side wall of the upper end cover 1 is evenly distributed with a diverter plate 12 perpendicular to the side wall of the upper end cover 1 and used for diversion above the buckle 11, so that when the fuel or engine oil flows through the side wall of the upper end cover 1, the diversion by the diverter plate 12 improves the orderliness and smoothness of the flow of the fuel or engine oil, thereby improving the filtering effect.

[0055] On the basis of the above embodiments, in order to improve the reliability of the overall structure of the filter element provided by the present invention, preferably, a convex ring 42 for inserting the center tube 2 and clamping with the inner wall of the center tube 2 is provided on the inner surface of the lower end of the outer frame 4, so that in the process of inserting the outer frame 4 into the outside of the filter paper 3, the convex ring 42 on the lower surface of the lower end of the outer frame 4 can be clamped on the inner wall of the center tube 2, so that the center tube 2 and the outer frame 4 can be fixedly connected, thereby improving the reliability of the connection between the two, and at the same time, it can also play a role of mutual positioning, thereby improving the reliability of the overall structure of the filter element.

[0056] On the basis of the above embodiment, in order to facilitate the insertion of the convex ring 42 into the central tube 2, preferably, the outer diameter of the convex ring 42 gradually increases downward along its axial direction, that is, the outer side wall of the convex ring 42 is a conical structure, so as to facilitate the insertion of the upper convex ring 42 of the outer frame 4 into the central tube 2, and to clamp and fix the convex ring 42 with the inner wall of the central tube 2. Considering that the outer frame 4 also needs to be connected and fixed with other devices, in order to facilitate the connection and fixation of the outer frame 4 with other devices, preferably, an internal thread 46 can be provided on the inner side wall of the convex ring 42.

[0057] On the basis of the above embodiment, considering that it is necessary to process the convex ring 42 on the upper surface of the lower end of the outer frame 4, in order to facilitate the processing of the convex ring 42, preferably, the outer frame 4 includes a side frame body 43 and a lower end cover 44 detachably connected to the lower end of the side frame body, and the convex ring 42 is arranged on the upper surface of the lower end cover. The side frame body 43 and the lower end cover 44 of the outer frame 4 are manufactured separately, which is convenient for production and can also reduce production costs.

[0058] On the basis of any of the above embodiments, considering the sealing connection between the filter paper 3 and the upper end cover 1 and the outer frame 4, preferably, the upper end surface of the filter paper 3 and the lower end surface of the upper end cover 1 are fixed by glue injection molding, and the lower end surface of the filter paper 3 and the inner surface of the lower end of the outer frame 4 are fixed by glue injection molding, that is, the upper end surface of the filter paper 3 is sealed and adhered to the lower end surface of the upper end cover 1 by glue, and the lower end surface of the filter paper 3 is sealed and adhered to the inner surface of the lower end surface of the outer frame 4 by glue, so as to ensure the reliability of the sealing connection between the filter paper 3 and the upper end cover 1 and the outer frame 4.

[0059] On the basis of the above embodiment, considering that the upper end cover 1 connected to the central tube 2 also needs to be connected to other devices, such as an oil suction pipe, that is, the inner hole on the upper end cover 1 needs to be connected to the oil suction pipe and other devices to transport the fuel or oil filtered by the filter element to the destination, preferably, a groove 13 for installing a sealing ring can be provided on the inner hole of the upper end cover 1 to ensure the sealing of the connection of the upper end cover 1. Considering that the upper end of the outer frame also needs to be connected to other devices, in order to ensure the sealing of the connection between the outer frame and other devices, preferably, an annular step surface 45 for installing a second sealing ring can be provided at the outer edge of the upper end of the outer frame 4 to ensure the sealing of the connection between the outer frame and other devices.

[0060] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0061] The filter element provided by the present invention is introduced in detail above. Specific examples are used in this article to illustrate the principle and implementation of the present invention. The description of the above embodiments is only used to help understand the method and core idea of ​​the present invention. It should be pointed out that for ordinary technicians in this technical field, without departing from the principle of the present invention, several improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A filter element, characterized in that: The filter paper (3) comprises a central tube (2) having a mesh-shaped side wall and a filter paper (3) sleeved on the side wall of the central tube (2); an upper end cover (1) is provided at the upper end of the central tube (2); an outer frame (4) having a mesh-shaped side wall is sleeved on the outer side of the filter paper (3); the upper end of the outer frame (4) is connected to the upper end cover (1); the upper end surface of the filter paper (3) is sealed to the lower end surface of the upper end cover (1); and the lower end surface of the filter paper (3) is sealed to the inner surface of the lower end of the outer frame (4); the outer periphery of the filter paper (3) is a pleated structure with a plurality of first arc-shaped folding units (32); the first arc-shaped folding units (32) are The filter paper (3) is an arc-shaped structure protruding outward, a boss (22) for inserting into a cavity formed by the first arc-shaped folding unit (32) is provided on the outer wall of the central tube (2), the end surface of the boss (22) facing the first arc-shaped folding unit (32) is a plane, the boss (22) is inserted into the outer end of the cavity formed by the first arc-shaped folding unit (32), and the outer frame (4) is cylindrical; or the filter paper (3) is a pleated structure with a plurality of second arc-shaped folding units (33) on the circumference, the second arc-shaped folding units (33) are arc-shaped structures recessed inward, and the inner surface of the outer frame (4) is A protrusion (48) for inserting into the cavity formed by the second arc-shaped folding unit (33) is provided on the wall; the end surface of the protrusion (48) facing the second arc-shaped folding unit (33) is a plane; the protrusion (48) is inserted into the outer end of the cavity formed by the second arc-shaped folding unit (33); the central tube (2) is cylindrical; a convex ring (42) for inserting into the central tube (2) and clamping with the inner wall of the central tube (2) is provided on the inner surface of the lower end of the outer frame (4); the outer diameter of the convex ring (42) gradually increases downward along its axial direction; a buckle (11) is provided on the side wall of the upper end cover (1); A slot (41) cooperating with the buckle (11) is provided on the upper inner wall of the outer frame (4); the upper part of the outer frame (4) is sleeved on the side wall of the upper end cover (1) so that the buckle (11) and the slot (41) are cooperating and connected; a flow dividing plate (12) for flow dividing and perpendicular to the side wall of the upper end cover (1) is evenly distributed on the side wall of the upper end cover (1) above the buckle (11); the outer frame (4) comprises a side frame body (43) and a lower end cover (44) detachably connected to the lower end of the side frame body (43); the convex ring (42) is provided on the upper surface of the lower end cover.

2. The filter element according to claim 1, characterized in that: An internal thread (46) is provided on the inner side wall of the convex ring (42).

3. The filter element according to claim 1, characterized in that: The upper end surface of the filter paper (3) and the lower end surface of the upper end cover (1) are fixed by means of glue injection molding, and the lower end surface of the filter paper (3) and the inner surface of the lower end of the outer frame (4) are fixed by means of glue injection molding.

4. The filter element according to claim 1, characterized in that: A groove (13) for mounting a first sealing ring is provided on the inner hole of the upper end cover (1).

5. The filter element according to claim 1, characterized in that: An annular step surface (45) for mounting a second sealing ring is provided at the outer edge of the upper end of the outer frame (4).

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