CN210289982U - Filter element of filter - Google Patents

Abstract

The utility model discloses a filter element, establish the filter paper on the center tube lateral wall for netted center tube and cover including the lateral wall, the upper end of center tube is equipped with the upper end cover, and the outside of filter paper is still overlapped and is equipped with the lateral wall and be netted frame, and the upper end of frame is connected in the upper end cover, and the up end sealing connection of filter paper is in the lower terminal surface of upper end cover, the lower terminal surface sealing connection of filter paper in the internal surface of the lower extreme of frame. With the filter paper parcel between frame and center tube, so that frame and center tube play the effect of protection filter paper, thereby can prevent that filter paper from taking place to warp, can make in fuel or engine oil gets into the frame from the lateral wall of frame, it is intraductal to get into the center tube after filtering by the filter paper that sets up between frame and center tube again, thereby when guaranteeing filter paper filter effect, with the filter paper parcel in order to prevent filter paper deformation between frame and center tube, the life of filter paper has been improved greatly, the filter effect of filter core has been guaranteed.

Description

Filter element of filter

Technical Field

The utility model relates to a filter technical field, more specifically say, relate to a filter element.

Background

The filter means a fitting functioning to filter foreign substances or gas through filter paper. Generally referred to as an automobile filter, is an accessory of an engine. The filter is a device for removing particle impurities, is used in an automobile and is mechanically connected with a piston, and when an internal combustion engine or a compressor works, the filter avoids the function of sucking impurities such as dust and the like so as to prevent the impurities from being adsorbed on the dust to aggravate the abrasion of parts and play a role in protecting and prolonging the service life of the internal combustion engine.

However, the filter element of the current filter still has the following defects: the filter paper on the filter element of the original filter is usually fixed by a string wound on the outer surface of the filter paper and coated with glue, and the filter paper is easy to deform due to the structure, so that the filtering effect of the filter element is influenced.

Therefore, how to solve the problem that the filter paper is easy to deform is a problem to be solved by those skilled in the art.

SUMMERY OF THE UTILITY MODEL

In view of this, the utility model aims at providing a filter element, this filter element can prevent that filter paper warp, guarantees the filter effect of filter core, improves the life of filter paper.

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

the utility model provides a filter element, includes that the lateral wall is netted center tube and cover and establishes filter paper on the center tube lateral wall, the upper end of center tube is equipped with the upper end cover, the outside of filter paper is still overlapped and is equipped with the lateral wall and be netted frame, the upper end of frame connect in the upper end cover, the up end sealing connection of filter paper in the lower terminal surface of upper end cover, the lower terminal surface sealing connection of filter paper in the internal surface of the lower extreme of frame.

Preferably, the filter paper is of a folded structure with a plurality of folded edges, the radial cross section of the filter paper is in a sawtooth shape, and a tooth-shaped groove matched with the tip of the folded edge is formed in the inner wall of the outer frame, so that the tooth-shaped groove is sleeved on the outer side of the folded edge.

Preferably, the outer wall of the central tube is provided with a flange for inserting into a cavity formed by the folded edge, the end face of the flange facing the folded edge is a plane, and the flange is inserted into the outer end of the cavity.

Preferably, the periphery of the filter paper is of a folded structure with a plurality of first arc-shaped folding units, the first arc-shaped folding units are of an arc-shaped structure protruding outwards, a boss used for being inserted into a cavity formed by the first arc-shaped folding units is arranged on the outer wall of the central tube, the end face, facing the first arc-shaped folding units, of the boss is a plane, and the boss is inserted into the outer end of the cavity formed by the first arc-shaped folding units.

Preferably, the filter paper is of a folded structure with a plurality of second arc-shaped folding units on the circumference, the second arc-shaped folding units are of an inward concave arc-shaped structure, a protrusion used for being inserted into a cavity formed by the second arc-shaped folding units is arranged on the inner wall of the outer frame, the end face of the protrusion facing the second arc-shaped folding units is a plane, and the protrusion is inserted into the outer end of the cavity formed by the arc-shaped folding units.

Preferably, the side wall of the upper end cover is provided with a buckle, the inner wall of the upper part of the outer frame is provided with a clamping groove matched with the buckle, and the upper part of the outer frame is sleeved on the side wall of the upper end cover so as to enable the buckle to be matched and connected with the clamping groove.

Preferably, the side wall of the upper end cover is uniformly distributed with a flow distribution plate which is vertical to the side wall of the upper end cover and used for flow distribution above the buckle.

Preferably, a convex ring inserted into the central tube and clamped with the inner wall of the central tube is arranged on the inner surface of the lower end of the outer frame.

Preferably, the outer diameter of the male ring is gradually increased downward along the axial direction thereof.

Preferably, the inner side wall of the convex ring is provided with an internal thread.

Preferably, the outer frame includes a side frame body and a lower end cap detachably connected to a lower end of the outer frame body, and the convex ring is disposed on an upper surface of the lower end cap.

Preferably, the upper end face of the filter paper and the lower end face of the upper end cover are fixed through glue injection molding, and the lower end face of the filter paper and the inner surface of the lower end of the outer frame are fixed through glue injection molding.

Preferably, the inner hole of the upper end cover is provided with a groove for mounting the first sealing ring.

Preferably, an annular step surface for mounting the second sealing ring is arranged at the outer edge of the upper end of the outer frame.

The utility model provides a filter element of filter, including the center tube and set up the upper end cover in the center tube upper end, the filter paper cover is established at the lateral wall of center tube, and the outside of filter paper still overlaps and is equipped with the frame, the upper end and the upper end cover fixed connection of frame, thereby wrap up filter paper between frame and center tube, so that frame and center tube play the effect of the filter paper of protection, thereby can prevent that filter paper from taking place to warp, and the up end sealing connection of filter paper is in the lower terminal surface of upper end cover, the sealing connection of the lower terminal surface of filter paper is in the internal surface of the lower extreme of frame, the lateral wall of frame and center tube is network structure, thereby can make fuel or engine oil get into in the frame from the lateral wall of frame, get into in the center tube after filtering by setting up and the filter paper between frame and the center tube, thereby when guaranteeing the filter effect of filter paper, greatly prolongs the service life of the filter paper and ensures the filtering effect of the filter element.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.

Fig. 1 is an exploded view of an embodiment of a filter element according to the present invention;

FIG. 2 is a schematic view of the upper end cap and center tube of FIG. 1;

FIG. 3 is a schematic view of the filter paper of FIG. 1;

FIG. 4 is a schematic radial cross-section of a filter element according to a first embodiment;

FIG. 5 is a schematic radial cross-section of a center tube in a first embodiment;

FIG. 6 is a schematic radial cross-section of a cartridge in a second embodiment;

FIG. 7 is a schematic radial cross-sectional view of a filter element in a third embodiment

FIG. 8 is a perspective view of the outer frame of FIG. 1;

FIG. 9 is an internal view of the housing of FIG. 1;

fig. 10 is an exploded view of the housing of fig. 1.

The device comprises an upper end cover, 11-buckles, 12-flow distribution plates, 13-grooves, 2-central pipes, 21-flanges, 22-bosses, 3-filter paper, 31-folded edges, 311-external folded edges, 312-internal folded edges, 32-first arc-shaped folding units, 33-second arc-shaped folding units, 4-outer frames, 41-clamping grooves, 42-convex rings, 43-measuring frame bodies, 44-lower end covers, 45-annular step surfaces, 46-internal threads, 47-tooth-shaped grooves and 48-bulges.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

The core of the utility model is to provide a filter element, this filter element can prevent that filter paper warp, guarantees the filter effect of filter core, improves the life of filter paper.

Referring to fig. 1 to 10, fig. 1 is an exploded schematic view of an embodiment of a filter element of the present invention; FIG. 2 is a schematic view of the upper end cap and center tube of FIG. 1; FIG. 3 is a schematic view of the filter paper of FIG. 1; FIG. 4 is a schematic radial cross-section of a filter element according to a first embodiment; FIG. 5 is a schematic radial cross-section of a center tube in a first embodiment; FIG. 6 is a schematic radial cross-section of a cartridge in a second embodiment; FIG. 7 is a schematic radial cross-sectional view of a filter element in a third embodiment; FIG. 8 is a perspective view of the outer frame of FIG. 1; FIG. 9 is an internal view of the housing of FIG. 1; fig. 10 is an exploded view of the housing of fig. 1.

The utility model provides a filter element, establish filter paper 3 on 2 lateral walls of center tube for netted center tube 2 and cover including the lateral wall, the upper end of center tube 2 is equipped with upper end cover 1, and the outside of filter paper 3 is still overlapped and is equipped with the lateral wall and be netted frame 4, and the upper end of frame 4 is connected in upper end cover 1, and the up end sealing connection of filter paper 3 is in the lower terminal surface of upper end cover 1, and the lower terminal surface sealing connection of filter paper 3 is in the internal surface of the lower extreme of frame 4.

Wherein, center tube 2 is cylindrical tubular structure, and the upper end and the lower extreme of center tube 2 are uncovered, and the upper end of center tube 2 is provided with upper end cover 1, and the middle part of upper end cover 1 is equipped with the hole, and hole and center tube 2 intercommunication, the cover is equipped with filter paper 3 on the lateral wall of center tube 2, and the lateral wall of center tube 2 is the mesh structure to fuel or engine oil after the filtration from filter paper 3 flows into center tube 2 from the lateral wall of center tube 2, is carried to other devices by center tube 2 again.

The outside cover of filter paper 3 is equipped with frame 4, the upper end of frame 4 is uncovered, the outside of filter paper 3 can be emboliaed from the lower extreme of filter paper 3 to the upper end of frame 4, the upper end of frame 4 is connected in upper end cover 1, and the up end of filter paper 3 and the lower terminal surface sealing connection of upper end cover 1, the lower terminal surface of filter paper 3 and the internal surface sealing connection of the lower extreme of frame 4, the lateral wall of frame 4 is netted structure, so that fuel or engine oil enters into frame 4 from the mesh department of the lateral wall of frame 4, enter into in the center tube 2 after filter paper 3 filters again.

Therefore, the filter element provided by the utility model comprises a central tube 2 and an upper end cover 1 arranged at the upper end of the central tube 2, a filter paper 3 is sleeved on the side wall of the central tube 2, an outer frame 4 is sleeved outside the filter paper 3, the upper end of the outer frame 4 is fixedly connected with 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 the role of the filter paper 3 for protection, thereby preventing the filter paper 3 from deforming, the upper end surface of the filter paper 3 is hermetically connected with the lower end surface of the upper end cover 1, the lower end surface of the filter paper 3 is hermetically connected with the inner surface of the lower end of the outer frame 4, the outer frame 4 and the side wall of the central tube 2 are both in a net structure, thereby fuel oil or engine oil can enter the outer frame 4 from the side wall of the outer frame 4, and, thereby when guaranteeing the filter effect of filter paper 3, wrap up filter paper 3 between frame 4 and center tube 2 in order to prevent that filter paper 3 from warping, improved filter paper 3's life greatly, guaranteed the filter effect of filter core.

The utility model discloses in, filter paper 3 can be multiple shape structure, according to the shape that filter paper 3 is different, frame 4 also can set up multiple auxiliary structure with center tube 2 and further prevent that filter paper 3 from producing deformation, prolongs filter paper 3's life.

In the first embodiment of the filter paper, the filter paper 3 has a pleated structure with a plurality of folds 31, the radial cross section of the filter paper 3 is zigzag, and the inner wall of the outer frame 4 is provided with a tooth-shaped groove 47 matching with the tip of the fold 31, so that the tooth-shaped groove 47 is sleeved outside the fold 31.

As shown in fig. 4, the filter paper 3 has a pleated structure formed by folding and having a plurality of folds 31 on the circumference, and the inside and the outside of the radial cross section of the filter paper are both zigzag. The filter paper 3 with the structure has a better filtering efficiency because the filter area is greatly increased due to the existence of the folds. However, after a long period of use, the folded edge 31 is easily deformed in the circumferential direction due to non-uniform accumulation of impurities, thereby causing a decrease in the filtration efficiency of the filter paper 3. In order to increase the deformation prevention capability of the folded edge 31 in the circumferential direction, a folded structure having the same shape as the filter paper 3 may be disposed on the outer frame 4, that is, a tooth-shaped groove 47 matched with the tip of the folded edge 31 is disposed on the inner wall of the outer frame 4, so that the folded edge 31 on the outer side of the filter paper 3 can be sleeved in the tooth-shaped groove 47 of the outer frame 4, thereby limiting the moving range of the folded edge 31 on the outer side of the filter paper 3, and thus effectively preventing the folded edge 31 on the outer side of the filter paper 3 from being deformed in the circumferential direction.

However, the configuration of the outer frame 4 as described above also has the following disadvantages: firstly, the material consumption of the outer frame 4 is greatly increased, which is not economical enough; secondly, after a long time of use, in some local positions, the folded edge 31 of the filter paper 3 may stick to the tooth-shaped groove 47 of the outer frame 4 at the contact surface, which may cause the mesh of the side wall of the outer frame 4 to be blocked, thereby causing the filtration efficiency to be reduced in the local position, and even the filter paper 3 in the local position may be damaged due to excessive local pressure, thereby losing the filtration effect.

In order to prevent the above situation, it is preferable that the tooth-shaped groove 47 is only fitted over the tip of the folded edge 31, i.e., the space formed by the tooth-shaped 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 outer folding line 311 and an inner folding line 312, the radial difference between the outer folding line 311 and the inner folding line 312 is L, the tooth-shaped groove 47 wraps the tip of the folding edge 31 of the filter paper 3, and at this time, the difference between the tooth-shaped groove 47 and the main body surface of the outer frame 4 is smaller than L. After the outer frame 4 is constructed in the structure, on one hand, materials are saved, and on the other hand, even if the folded edge 31 of the filter paper 3 is adhered to the tooth-shaped groove 47 of the outer frame 4 on the contact surface, fuel oil or engine oil can enter the inner part of the outer frame 4 from the main body surface area of the outer frame 4 and then filter the filter paper 3, and the problem of excessive local pressure cannot be caused. More preferably, the difference between the tooth-shaped groove 47 and the main body surface of the outer frame 4 is less than half of L.

Furthermore, the outer wall of the central tube 2 is provided with a flange 21 for inserting into the cavity formed by the folded edge 31, 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.

The central tube 2 may be constructed in a corrugated structure having the same shape as the filter paper 3, that is, a flange 21 is provided on the outer wall of the central tube 2 for inserting into the cavity formed by the folded edge 31, 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 being deformed in the circumferential direction. For the same reason as described above, it is preferable that the end surface of the flange 21 of the center tube 2 facing the folded edge 31 is a flat surface, which occupies only a part of the space after being inserted into the space formed by the folded edge 31 of the filter paper 3, as shown in fig. 5, and therefore, the problem of excessive local pressure can be avoided even when the center tube 2 is constructed as described above.

In the second embodiment of the filter paper, the outer circumference of the filter paper 3 has a pleated structure with a plurality of first arc-shaped folding units 32, the first arc-shaped folding units 32 have an arc-shaped structure protruding outward, a boss 22 for inserting into a cavity formed by the first arc-shaped folding units 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 units 32 is a flat surface, and the boss 22 is inserted into the outer end of the cavity formed by the first arc-shaped folding units 32.

As shown in fig. 6, the filter paper 3 has a pleated structure formed by folding and having a plurality of first arc-shaped folding units 32 at the circumference thereof, the first arc-shaped folding units 32 of the filter paper 3 have an arc-shaped structure protruding outward, and the filter paper 3 has a circular shape with waves in the radial cross section thereof. When fuel or engine oil pass through filter paper 3 from frame 4 inside, can exert pressure to the first arc folding unit on filter paper 3, and first arc structure can spread the pressure conduction that certain point received to whole structure, consequently, the pressure that each point received on filter paper 3 is comparatively balanced to avoid local pressure too big emergence deformation.

In order to further enhance the deformation resistance of the filter paper 3, the central tube 2 may be constructed in a corrugated structure, that is, 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, and the end surface 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 occupies only a 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 are prevented from being stuck on the contact surface. The outer frame 4 is still cylindrical, and as shown in fig. 6A, a certain space can be reserved between the side wall of the outer frame 4 and the filter paper 3, but as shown in fig. 6B, if the side wall of the outer frame 4 is configured to fit the filter paper 3 to form a contact surface, even if the filter paper 3 is slightly deformed to some extent, the deformation resistance of the filter paper 3 can be further enhanced.

In the third embodiment of the filter paper 3, the filter paper 3 has a corrugated structure with a plurality of second arc-shaped folding units 33 around the circumference, the second arc-shaped folding units 33 have an inwardly concave arc-shaped structure, a protrusion 48 for inserting into a cavity formed by the second arc-shaped folding units 33 is provided on the inner wall of the outer frame 4, the end surface of the protrusion 48 facing the second arc-shaped folding units 33 is a flat surface, and the protrusion 48 is inserted into the outer end of the cavity formed by the second arc-shaped folding units 33.

As shown in fig. 7, the filter paper 3 is a folded structure with a plurality of second arc-shaped folding units 33 formed on the circumference after being folded, and unlike the previous embodiment, the arc-shaped folding units 32 of the filter paper 3 are inwardly concave arc-shaped structures, and similar to the previous embodiment, the structure of the filter paper 3 in this embodiment can also achieve the effect of balanced stress at each point, thereby avoiding deformation due to excessive local pressure. In order to further enhance the deformation resistance of the filter paper 3, the inner wall of the outer frame 4 is provided with a protrusion 48 for being inserted into the cavity formed by the second arc-shaped folding unit 33, the end surface of the protrusion 48 facing the second arc-shaped folding unit 33 is a plane, and 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, so that a certain limiting effect is formed on the filter paper 3, and the filter paper 3 is prevented from being deformed. In addition, the central tube 2 is still cylindrical, and as shown in fig. 7A, a certain space may be left between the central tube 2 and the filter paper 3, but as shown in fig. 7B, if the central tube 2 is arranged to be attached to the filter paper 3 to form a contact surface, even if the filter paper 3 is slightly deformed to some extent, the deformation resistance of the filter paper 3 can be further enhanced.

On the basis of the above embodiment, in consideration of the arrangement of the connection manner between the outer frame 4 and the upper end cover 1, it is preferable that the side wall of the upper end cover 1 is provided with the buckle 11, correspondingly, the inner wall of the upper portion of the outer frame 4 is provided with the slot 41 matched with the buckle 11, the upper portion of the outer frame 4 is sleeved on the side wall of the upper end cover 1, so that the buckle 11 is matched and connected with the slot 41, and the buckle 11 is clamped 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 may also be connected and fixed by other connection methods, for example, by bolts or screw connection methods. It should be noted that the upper end cap 1 and the outer frame 4 should be detachably connected to facilitate installation and replacement of the filter cartridge.

On the basis of the above embodiment, in order to improve the smoothness of the fuel or the engine oil flowing through the side wall of the upper end cover 1, preferably, the side wall of the upper end cover 1 is uniformly distributed with the flow distribution plate 12 which is perpendicular to the side wall of the upper end cover 1 and used for flow distribution above the buckle 11, so that when the fuel or the engine oil flows through the side wall of the upper end cover 1, the flow distribution plate 12 distributes the flow to improve the order and the smoothness of the fuel or the engine oil flowing, and further improve the filtering effect.

On the basis of above-mentioned embodiment, for improving the utility model provides a filter element overall structure's reliability, it is preferred, be equipped with on the inner surface of the lower extreme of frame 4 and be used for inserting center tube 2 and with the bulge loop 42 of the inner wall chucking of center tube 2, thereby in-process embolia the outside of filter paper 3 with frame 4, can make on the bulge loop 42 card of the lower surface of frame 4 goes into on the inner wall of center tube 2, thereby can be with center tube 2 and frame 4 fixed connection, improve the reliability that the two is connected, can also play mutual positioning's effect simultaneously, improve filter element overall structure's reliability.

On the basis of the above-mentioned embodiment, in order to facilitate the insertion of the protruding ring 42 into the central tube 2, it is preferable that the outer diameter of the protruding ring 42 is gradually increased downward along the axial direction thereof, that is, the outer side wall of the protruding ring 42 has a tapered structure, so as to facilitate the insertion of the upper protruding ring 42 of the outer frame 4 into the central tube 2 and to tightly fix the protruding ring 42 with the inner wall of the central tube 2. Considering that the outer frame 4 is also required to be connected and fixed with other devices, in order to facilitate the connection and fixation of the outer frame 4 with other devices, it is preferable that an inner thread 46 be provided on an inner side wall of the protruding ring 42.

In addition to the above embodiments, in consideration of the need to process the protruding ring 42 on the upper surface of the lower end of the outer frame 4, in order to facilitate the processing of the protruding ring 42, it is preferable that the outer frame 4 includes the side frame 43 and the lower cover 44 detachably connected to the lower end of the outer frame, and the protruding ring 42 is provided on the upper surface of the lower cover. The side frame body 43 and the lower end cover 44 of the outer frame 4 are manufactured separately, so that the production is facilitated and the production cost is reduced.

In addition to any of the above embodiments, in consideration of the sealing connection manner of the filter paper 3 with the upper end cap 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 cap 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 cap 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 of the filter paper 3 with.

In addition to the above embodiments, considering that the upper end cap 1 connected to the central tube 2 needs to be communicated with other devices, such as an oil suction pipe, etc., that is, the inner hole of the upper end cap 1 needs to be communicated with the oil suction pipe, etc. to deliver the fuel or engine oil filtered by the filter element to the target location, it is preferable that the inner hole of the upper end cap 1 is provided with a groove 13 for installing a sealing ring, so as to achieve the sealing performance of the connection of the upper end cap 1. In order to ensure the sealing performance of the connection between the outer frame and other devices, it is preferable that an annular step surface 45 for mounting the second sealing ring is provided at the outer edge of the upper end of the outer frame 4 to ensure the sealing performance of the connection between the outer frame and other devices.

The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.

The filter element provided by the utility model is introduced in detail above. The principles and embodiments of the present invention have been explained herein using specific examples, and the above descriptions of the embodiments are only used to help understand the method and its core ideas of the present invention. It should be noted that, for those skilled in the art, without departing from the principle of the present invention, the present invention can be further modified and modified, and such modifications and modifications also fall within the protection scope of the appended claims.

Claims (14)

1. The utility model provides a filter element, its characterized in that includes that the lateral wall is netted center tube (2) and cover and establishes filter paper (3) on center tube (2) lateral wall, the upper end of center tube (2) is equipped with upper end cover (1), the outside of filter paper (3) is still overlapped and is equipped with the lateral wall and be netted frame (4), the upper end of frame (4) connect in upper end cover (1), the up end sealing connection of filter paper (3) in the lower terminal surface of upper end cover (1), the lower terminal surface sealing connection of filter paper (3) in the internal surface of the lower extreme of frame (4).

2. The filter element of claim 1, wherein the filter paper (3) is of a folded structure with a plurality of folded edges (31), the radial cross section of the filter paper (3) is of a saw-tooth shape, and a tooth-shaped groove (47) matched with the tip of the folded edge (31) is arranged on the inner wall of the outer frame (4) so that the tooth-shaped groove (47) is sleeved outside the folded edge (31).

3. A filter element according to claim 2, wherein the outer wall of the central tube (2) is provided with a flange (21) for insertion into a cavity formed by the flange (31), the end surface of the flange (21) facing the flange (31) being flat, the flange (21) being inserted into the outer end of the cavity.

4. The filter element of claim 1, wherein the outer periphery of the filter paper (3) is of a pleated structure with a plurality of first arc-shaped folding units (32), the first arc-shaped folding units (32) are of an arc-shaped structure protruding outwards, a boss (22) for inserting into a cavity formed by the first arc-shaped folding units (32) is arranged on the outer wall of the central tube (2), the end surface of the boss (22) facing the first arc-shaped folding units (32) is a plane, and the boss (22) is inserted into the outer end of the cavity formed by the first arc-shaped folding units (32).

5. The filter cartridge of claim 1, wherein the filter paper (3) is of a pleated structure with a plurality of second arc-shaped folding units (33) at the circumference, the second arc-shaped folding units (33) are of an arc-shaped structure which is concave towards the inside, the inner wall of the outer frame (4) is provided with a protrusion (48) which is inserted into a cavity formed by the second arc-shaped folding units (33), the end surface of the protrusion (48) facing the second arc-shaped folding units (33) is a plane, and the protrusion (48) is inserted into the outer end of the cavity formed by the second arc-shaped folding units (33).

6. The filter element of claim 1, wherein a buckle (11) is arranged on the side wall of the upper end cap (1), a slot (41) matched with the buckle (11) is arranged on the inner wall of the upper part of the outer frame (4), and the upper part of the outer frame (4) is sleeved on the side wall of the upper end cap (1) so that the buckle (11) is matched and connected with the slot (41).

7. The filter cartridge of claim 6, wherein the side wall of the upper end cap (1) is evenly distributed with flow distribution plates (12) perpendicular to the side wall of the upper end cap (1) above the buckles (11) for flow distribution.

8. The filter cartridge according to claim 1, wherein the inner surface of the lower end of the outer frame (4) is provided with a protruding ring (42) for inserting the center tube (2) and gripping the inner wall of the center tube (2).

9. A filter cartridge according to claim 8, wherein the outer diameter of the collar (42) increases downwards in its axial direction.

10. A filter cartridge as claimed in claim 9, characterised in that the collar (42) is provided with an internal thread (46) on its inner side wall.

11. A filter cartridge according to claim 10, wherein the outer frame (4) comprises a side frame (43) and a lower end cap (44) detachably connected to the lower end of the outer frame, the collar (42) being provided on the upper surface of the lower end cap.

12. The filter cartridge according to any one of claims 1 to 11, wherein the upper end surface of the filter paper (3) and the lower end surface of the upper end cap (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.

13. A filter cartridge according to claim 12, wherein the inner bore of the upper end cap (1) is provided with a groove (13) for mounting a first sealing ring.

14. A filter cartridge according to claim 13, wherein the outer rim of the upper end of the outer frame (4) is provided with an annular step surface (45) for mounting a second sealing ring.

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