PP cotton activated carbon composite filter element and processing technology thereof

Abstract

The invention relates to the technical field of composite filter elements, in particular to a PP cotton activated carbon composite filter element and a processing technology thereof. A positioning solenoid head is in adaptive threaded connection with a water outlet threaded notch so as to realize the positioning work of a composite filter element main body; the tail plugging end cover is used for plugging the tail of the composite filter element main body; the front end of the composite filter element is blocked through the front blocking end cover, the tail end of the composite filter element is blocked through the tail blocking end cover, and the front blocking end cover and the tail blocking end cover are used in cooperation, so that the sleeving stability of the activated carbon rod and the PP cotton sleeve layer is improved, and the composite filter element is convenient to install and use. The positioning solenoid head arranged on the front plugging end cover is in threaded connection with the water outlet threaded notch in the bottom side of the end cover of the water purification device, so that the composite filter element can be quickly positioned, and the situation that the composite filter element is subjected to position deviation during subsequent installation and use, so that the sealing dislocation of the composite filter element is caused is avoided; therefore, the normal use of the composite filter element is ensured.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of composite filter element, in particular to a PP cotton activated carbon composite filter element and a processing technology thereof. BACKGROUND

[0002] The PP cotton and activated carbon composite filter element is a common combined filter element in a water purifier, which improves water quality through physical interception and chemical adsorption; the PP cotton layer is used for intercepting large-particle impurities (1-50 microns) such as rust and silt to protect the subsequent filter element; the activated carbon layer is used for adsorbing residual chlorine, color and odor, and part of organic matter to improve taste; the activated carbon layer is generally provided as a carbon rod.

[0003] The processing technology of the PP cotton activated carbon composite filter element combines physical interception and chemical adsorption technology, and the core process and technical points are as follows; for: The PP cotton layer is made of polypropylene (PP) particles as raw material, which is formed into a gradient microporous structure through melt extrusion and spinning forming process, and the filtration precision is 1-50 microns; The activated carbon layer is made of coconut shell / coal activated carbon as raw material, which forms an adsorption layer through compression or particle filling process, and part of the process adopts "three times of carbon scattering and three adhesions" to enhance the adsorption capacity; Then the activated carbon layer and the PP cotton layer are processed in conformity, that is, the PP cotton body and the activated carbon rod body are sleeved, and are fixed through the annular groove and the movable collar; some are compounded by hot melt adhesive or adhesive, and part of the process adopts high temperature sintering (such as 126 DEG C steam sterilization) to improve the structural stability.

[0004] For the composite mode of sleeving the PP cotton body and the activated carbon rod body, a fastening ring is generally arranged at both ends of the two after they are sleeved and combined, so as to ensure the stability of the use of the two; in the prior art, one end of the filter element needs to be connected with the water outlet of the water purifying device, that is, in the working process of the filter element in the water purifying device, water enters from the water inlet, and then purified water flows out from the water outlet after being filtered by the filter element; for the installation and use of the filter element, a limiting ring is arranged at the water outlet position of the water purifying device, then one end of the filter element is sleeved on the guide ring, the top cover of the water purifying device is connected with the transparent water storage barrel through threads, the installed filter element is in the transparent water storage barrel, a sealing structure is arranged at the bottom end of the inner cavity of the transparent water storage barrel to block the other end of the filter element, and when the top cover and the transparent water storage barrel are connected through threads, the sealing of the two ends of the filter element is inevitably dislocated, which needs to be adjusted for many times and is troublesome.

[0005] Therefore, the present application provides a PP cotton activated carbon composite filter element and a processing technology thereof to solve the above problems. SUMMARY

[0006] The present application aims to provide a PP cotton activated carbon composite filter element and a processing technology thereof to solve the problems in the background art.

[0007] To achieve the above-mentioned purpose, the present application provides the following technical scheme: a PP cotton activated carbon composite filter element, comprising an activated carbon rod and a PP cotton sleeve layer sleeved outside the activated carbon rod, the composite filter element main body composed of the activated carbon rod and the PP cotton sleeve layer is placed in a transparent water storage bucket, a threaded connection part provided at the top end of the transparent water storage bucket is threadedly connected with an internal threaded connection cap at the bottom of an end cover of a water purification device, a water inlet pipe and a water outlet pipe are provided on the end cover of the water purification device, and the water inlet pipe is connected with a water inlet for water inflow; The water outlet pipe is connected and arranged with a water outlet threaded slot; A predetermined positioning clamping groove is provided at the outer side of the front end of the composite filter element main body, and the composite filter element main body is connected and arranged with a filter element auxiliary assembly; The filter element auxiliary assembly comprises a front plugging end cover and a positioning screw pipe head provided on the front plugging end cover, the positioning screw pipe head is threadedly connected with the water outlet threaded slot to realize the positioning work of the composite filter element main body. The filter element auxiliary assembly further comprises a tail plugging end cover for plugging the tail of the composite filter element main body.

[0008] Preferably, a predetermined positioning clamping head is provided at the inner side of the front plugging end cover, the predetermined positioning clamping head is adapted to be clamped with the predetermined positioning clamping groove at the outer side of the front end of the composite filter element main body, and a predetermined positioning effect is provided for the installation of the composite filter element main body and the filter element auxiliary assembly.

[0009] Preferably, the front plugging end cover is further connected and arranged with an auxiliary pipe body, and a butt joint threaded part is provided at the outer side of the tail end of the auxiliary pipe body. The auxiliary pipe body is in communication with the positioning screw pipe head for water purification and discharge.

[0010] Preferably, a flow-through hole body is provided on the side wall of the auxiliary pipe body. The flow-through hole bodies are equidistantly and linearly arranged in the axial direction of the auxiliary pipe body, and four groups of the linearly arranged flow-through hole bodies are provided.

[0011] Preferably, the flow-through hole bodies are in communication with the inner cavity of the auxiliary pipe body, and the water purified by the composite filter element main body enters the auxiliary pipe body through the flow-through hole bodies.

[0012] Preferably, a butt joint screw groove is provided at the inner side of the tail plugging end cover. The butt joint screw groove is threadedly connected with the butt joint threaded part of the tail part of the auxiliary pipe body, is used for connecting the tail part blocking end cover with the auxiliary pipe body, and provides a stable effect for the sleeve connection of the activated carbon rod and the PP cotton sleeve layer.

[0013] Preferably, anti-skid stripes are also arranged on the outer side wall of the tail part blocking end cover at equal intervals, which provide an anti-skid effect during the rotation of the tail part blocking end cover.

[0014] Preferably, an auxiliary structure is also arranged in the auxiliary pipe body, which is used for providing purification for water purified by the composite filter core main body again. The auxiliary structure comprises a containing cavity and a water permeable purification membrane; the containing cavity is arranged in the auxiliary pipe body, and a cavity opening of the containing cavity extends to a tail end position of the auxiliary pipe body. The water permeable purification membrane is arranged in the containing cavity, and the water permeable purification membrane arranged here purifies the purified water again.

[0015] Preferably, four groups of containing cavities are arranged in the auxiliary pipe body at equal intervals, and the containing cavities are arranged in communication with the flow-through hole body. A connecting head piece is fixedly arranged at one end of the water permeable purification membrane, the connecting head piece is arranged as an arc-shaped strip, after the four groups of water permeable purification membranes are installed in the containing cavities, the arc-shaped strip arranged at one end of the water permeable purification membrane forms a ring-shaped strip body, and the ring-shaped strip body is in contact with the tail end of the auxiliary pipe body.

[0016] A processing technology of a PP cotton activated carbon composite filter core, the processing technology comprises the following steps: S1: polypropylene particles are used as raw materials, and a gradient microporous structure is prepared through melt extrusion and spinning forming processes; S2: coconut shell / coal activated carbon is used as raw materials, and an adsorption layer is formed through compression; S3: the PP cotton sleeve layer and the activated carbon rod are sleeved to form a composite filter core main body, then a front blocking end cover is clamped at a front end of the composite filter core main body, and a pre-positioning clamping head in the front blocking end cover needs to be clamped in a pre-positioning clamping groove outside the front end of the composite filter core main body, at the same time, an auxiliary pipe body is arranged in the composite filter core main body, and a tail end of the auxiliary pipe body reaches a tail end position of the composite filter core main body; S4: the tail end of the composite filter core main body is blocked by using a tail part blocking end cover, a butt joint screw groove in a central position of the tail part blocking end cover is threadedly connected with a butt joint threaded part of the tail part of the auxiliary pipe body, and the tail part blocking end cover is screwed.

[0017] Compared with the prior art, the present application has the following beneficial effects: The PP cotton active carbon composite filter core designed by the application is characterized in that the composite filter core body composed of an active carbon rod and a PP cotton sleeve layer is firstly plugged at the front end by the front plugging end cover and at the tail end by the tail plugging end cover, and the front plugging end cover and the tail plugging end cover are used in cooperation, which is favorable for improving the sleeving stability of the active carbon rod and the PP cotton sleeve layer, and in the installation and use of the composite filter core, the positioning screw pipe head provided on the front plugging end cover is screwed with the water outlet thread groove at the bottom side of the water purifying device end cover, so that the composite filter core can be quickly positioned, and the position deviation of the composite filter core in the subsequent installation and use is avoided, and the sealing misalignment of the composite filter core is caused. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is an installation state structure connection explosion schematic view of the PP cotton active carbon composite filter core of the application. Figure 2 It is an installation state structure connection explosion bottom view of the PP cotton active carbon composite filter core of the application. Figure 3 It is Figure 2 an enlarged schematic view of the structure connection at A in the middle. Figure 4 It is an explosion schematic view of the front end structure connection of the composite filter core of the application. Figure 5 It is Figure 4 an enlarged schematic view of the structure connection at B in the middle. Figure 6 It is Figure 4 an enlarged schematic view of the structure connection at C in the middle. Figure 7 It is an explosion schematic view of the tail structure connection of the composite filter core of the application. Figure 8 It is Figure 7 an enlarged schematic view of the structure connection at D in the middle. Figure 9 It is an auxiliary pipe body and auxiliary structure connection schematic view of the application. Figure 10 It is Figure 9 an enlarged schematic view of the structure connection at E in the middle. Figure 11 It is a water permeable purification membrane structure connection schematic view of the application.

[0019] In the figure: transparent water storage bucket 1, threaded connection part 11, water purifying device end cover 2, internal threaded connection cap 21, water inlet pipe 3, water inlet 31, water outlet pipe 4, water outlet thread groove 41, active carbon rod 5, PP cotton sleeve layer 6, pre-positioning clamping groove 61. Front plugging end cover 701, auxiliary pipe body 702, positioning screw pipe head 703, pre-positioning chuck 704, butt joint threaded part 705, flow-through hole body 706; Tail plugging end cover 801, butt joint screw groove 802, anti-skid stripe 803; Cavity 901, water-permeable purification membrane 902, connecting head piece 903. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the present application will be described clearly and completely below. All other embodiments obtained by those of ordinary skill in the art without creative labor on the premise that the embodiments in the present application are described, belong to the scope of protection of the present application.

[0021] Embodiment one: please refer to Figures 1-11 A PP cotton activated carbon composite filter element, comprising an activated carbon rod 5 and a PP cotton sleeve layer 6 sleeved outside the activated carbon rod 5, the composite filter element main body composed of the activated carbon rod 5 and the PP cotton sleeve layer 6 is placed in a transparent water storage bucket 1, a threaded connection part 11 provided at the top end of the transparent water storage bucket 1 is threadedly connected with an inner threaded connection cap 21 at the bottom of a water purification device end cover 2, a water inlet pipe 3 and a water outlet pipe 4 are provided on the water purification device end cover 2, the water inlet pipe 3 is connected with a water inlet 31 for water inflow, and the water outlet pipe 4 is connected with a water outlet threaded slot 41; a pre-positioning clamping groove 61 is provided on the outer side of the front end of the composite filter element main body, and the composite filter element main body is connected with a filter element auxiliary assembly; the PP cotton sleeve layer 6 is made of polypropylene particles as raw material, and is formed into a gradient microporous structure through melt extrusion and spinning forming process; the activated carbon rod 5 is made of coconut shell / coal activated carbon as raw material, and forms an adsorption layer through compression.

[0022] According to the drawings Figures 3-8As shown, the filter auxiliary assembly includes a front blocking end cover 701 and a positioning pipe head 703 arranged on the front blocking end cover 701, which is threadedly connected with the water outlet threaded slot 41 to realize the positioning of the composite filter body; the filter auxiliary assembly further includes a tail blocking end cover 801 for blocking the tail of the composite filter body; that is, for the composite filter body composed of the activated carbon rod 5 and the PP cotton sleeve layer 6, the front end is first blocked by the arranged front blocking end cover 701, and the tail end is blocked by the arranged tail blocking end cover 801, and the front blocking end cover 701 and the tail blocking end cover 801 are used in cooperation, which is beneficial to improve the sleeve stability of the activated carbon rod 5 and the PP cotton sleeve layer 6. For the composite filter during installation and use, the positioning pipe head 703 arranged on the front blocking end cover 701 is threadedly connected with the water outlet threaded slot 41 at the bottom side of the water purifying device end cover 2, which can quickly position the composite filter, avoid position deviation of the composite filter during subsequent installation and use, and cause sealing misalignment of the composite filter.

[0023] In the above scheme, compared with the existing technology of the cylindrical composite filter, on the one hand, the installation and positioning of the cylindrical composite filter is more troublesome, generally the tail end of the cylindrical composite filter is placed on the sealing ring at the bottom of the transparent water storage bucket 1 or the limiting ring with sealing effect, then the water purifying device end cover 2 is connected with the transparent water storage bucket 1, and after stable connection, the front end of the cylindrical composite filter is aligned with the water outlet in the water purifying device end cover 2 to realize the blocking of the front end of the cylindrical composite filter. In actual operation process, it is easy to cause the position deviation of the cylindrical composite filter, cause the sealing gap of the front end and the tail end of the cylindrical composite filter, cause negative influence on the sealing effect, and finally affect the purification work of the cylindrical composite filter.

[0024] Wherein when the front plugging end cover 701 is installed with the front end of the composite filter core body, the PP cotton sleeve layer 6 is sleeved with the activated carbon rod 5 to form the composite filter core body, then the front plugging end cover 701 is clamped at the front end of the composite filter core body, and the positioning clamping head 704 inside the front plugging end cover 701 needs to be clamped in the positioning clamping groove 61 outside the front end of the composite filter core body, at the same time, the auxiliary pipe body 702 is arranged to enter the composite filter core body, and the tail end of the auxiliary pipe body 702 reaches the tail end position of the composite filter core body; at this time, the front plugging end cover 701 is pressed by hand again to ensure that the front plugging end cover 701 is tightly connected with the front end of the composite filter core body, wherein the positioning clamping head 704 is matched and clamped with the positioning clamping groove 61 outside the front end of the composite filter core body, which provides a positioning effect for the installation of the composite filter core body and the filter core auxiliary assembly; then the tail plugging end cover 801 is used to plug the tail end of the composite filter core body, wherein the butt joint threaded part 705 is arranged outside the tail end of the auxiliary pipe body 702; the auxiliary pipe body 702 is communicated with the positioning screw pipe head 703 and is used for water delivery and discharge; that is, the butt joint screw groove 802 at the central position of the tail plugging end cover 801 is screwed with the butt joint threaded part 705 at the tail of the auxiliary pipe body 702, and the tail plugging end cover 801 can be tightened after being rotated; that is, the butt joint screw groove 802 is arranged at the central position inside the tail plugging end cover 801; the butt joint screw groove 802 is matched and screwed with the butt joint threaded part 705 at the tail of the auxiliary pipe body 702, which is used for connecting the tail plugging end cover 801 with the auxiliary pipe body 702 and providing a stable effect for the sleeving of the activated carbon rod 5 and the PP cotton sleeve layer 6; that is, the butt joint screw groove 802 is aligned with the butt joint threaded part 705 at the tail of the auxiliary pipe body 702, then the tail plugging end cover 801 is rotated by hand to screw the butt joint screw groove 802 at the central position with the butt joint threaded part 705, until the tail plugging end cover 801 is tightened, at this time, the tail plugging end cover 801 is tightly contacted with the tail end of the composite filter core body to provide a plugging effect.

[0025] Wherein according to the drawings Figures 5-6 and the drawings Figure 8 As shown in the drawings, the flow-through hole body 706 is arranged on the side wall of the auxiliary pipe body 702; the flow-through hole body 706 is linearly arranged equidistantly in the axial direction of the auxiliary pipe body 702, and four groups of linearly arranged flow-through hole bodies 706 are arranged; the flow-through hole body 706 is communicated with the inner cavity of the auxiliary pipe body 702, and the water purified by the composite filter core body enters the auxiliary pipe body 702 through the flow-through hole body 706.

[0026] The outer side wall of the tail plugging end cover 801 is also provided with anti-skid stripes 803 at equal intervals, which provide an anti-skid effect during the rotation of the tail plugging end cover 801. When the tail plugging end cover 801 is rotated by hand, the anti-skid stripes 803 provided on the outer side of the tail plugging end cover 801 help to improve the friction effect with the hand, facilitating the rotation operation of the tail plugging end cover 801 by the staff.

[0027] For the use of the composite filter element, in combination with the above Figures 7-11 As shown in the auxiliary pipe body 702, an auxiliary structure is arranged in the auxiliary pipe body 702, which is used to provide purification to the water purified by the composite filter element main body again; that is, the water purified by the PP cotton sleeve layer 6 and the activated carbon rod 5 is also purified by the water-permeable purification membrane 902 in the accommodating cavity 901 during the process of entering the auxiliary pipe body 702 through the flow-through hole body 706, so as to provide one-time purification and filtration to the water flow again to improve the water quality; wherein the auxiliary structure comprises the accommodating cavity 901 and the water-permeable purification membrane 902; the accommodating cavity 901 is arranged in the auxiliary pipe body 702, and the cavity opening of the accommodating cavity 901 extends to the tail end position of the auxiliary pipe body 702; the water-permeable purification membrane 902 is placed in the accommodating cavity 901, and the water-permeable purification membrane 902 placed here purifies the purified water again; the accommodating cavity 901 is provided with four groups at equal intervals in the auxiliary pipe body 702, and the accommodating cavity 901 is in communication with the flow-through hole body 706.

[0028] The water-permeable purification membrane 902 for purifying the water flow through the flow hole body 706 is placed in the accommodating cavity 901 in the auxiliary pipe body 702, and a connecting head piece 903 is fixedly arranged at one end of the water-permeable purification membrane 902, which is arranged in the shape of an arc. After four groups of water-permeable purification membranes 902 are installed in the accommodating cavities 901, the arcs arranged at one end of the water-permeable purification membranes 902 form a ring-shaped strip body, which is in contact with the tail end of the auxiliary pipe body 702. The water-permeable purification membrane 902 is detachably arranged, that is, when in use, the water-permeable purification membrane 902 is inserted into the corresponding accommodating cavity 901 until the arc arranged at one end of the water-permeable purification membrane 902 is in contact with the tail end of the auxiliary pipe body 702, and then the other three groups of water-permeable purification membranes 902 are installed in the other three groups of accommodating cavities 901. After the four groups of water-permeable purification membranes 902 are installed, the four arcs form a ring-shaped strip body. The arc is arranged in such a way that when the water-permeable purification membrane 902 needs to be replaced in the later stage, the arc can be directly pinched by hand and pulled outward until the water-permeable purification membrane 902 is pulled out of the accommodating cavity 901, that is, the arc facilitates the disassembly of the water-permeable purification membrane 902. The ring-shaped strip body formed by the four arcs is in contact with the end face of the tail end of the auxiliary pipe body 702, that is, after the auxiliary pipe body 702 is connected with the tail end sealing cover 801, the ring-shaped strip body can also provide an auxiliary sealing effect.

[0029] Although the embodiments of the present application have been shown and described, it is to be understood that various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A PP cotton activated carbon composite filter element, comprising an activated carbon rod (5) and a PP cotton sleeve (6) sleeved on the outside of the activated carbon rod (5), the composite filter element body composed of the activated carbon rod (5) and the PP cotton sleeve (6) is placed in a transparent water storage tank (1), a threaded connection part (11) provided at the top of the transparent water storage tank (1) is threadedly connected to the internal threaded connection cap (21) at the bottom of the end cover (2) of the water purification device, an inlet pipe (3) and an outlet pipe (4) are provided on the end cover (2) of the water purification device, and the inlet pipe (3) is connected to the inlet (31) for water input; Its features are: The water outlet pipe (4) is connected to the water outlet threaded groove (41); A prepositioning slot (61) is provided on the outer front end of the composite filter element body, and the composite filter element body is connected to the filter element auxiliary component. The filter element auxiliary component includes a front sealing end cap (701) and a positioning screw head (703) provided on the front sealing end cap (701). The positioning screw head (703) is threaded to be adapted to the water outlet threaded groove (41) to realize the positioning of the composite filter element body. The filter element auxiliary assembly also includes a tail end cap (801) for sealing the tail of the composite filter element body.

2. The PP cotton activated carbon composite filter element according to claim 1, characterized in that: A pre-positioning clip (704) is provided on the inner side of the front sealing end cap (701). The pre-positioning clip (704) is adapted to engage with the pre-positioning slot (61) on the outer side of the front end of the composite filter element body, providing a pre-positioning function for the installation of the composite filter element body and the filter element auxiliary components.

3. The PP cotton activated carbon composite filter element according to claim 1, characterized in that: The front sealing end cap (701) is also connected to the auxiliary tube body (702), and a mating threaded part (705) is provided on the outer side of the tail end of the auxiliary tube body (702). The auxiliary pipe (702) is connected to the positioning screw head (703) for the conveying and discharge of purified water.

4. The PP cotton activated carbon composite filter element according to claim 3, characterized in that: A flow hole (706) is provided on the side wall of the auxiliary tube (702). The flow-through orifice (706) is arranged in a straight line at equal intervals along the axial direction of the auxiliary tube (702), and there are a total of four sets of flow-through orifices (706) arranged in a straight line.

5. The PP cotton activated carbon composite filter element according to claim 4, characterized in that: The flow-through hole (706) is connected to the inner cavity of the auxiliary tube (702), and the water purified by the composite filter body enters the auxiliary tube (702) through the flow-through hole (706).

6. The PP cotton activated carbon composite filter element according to claim 3, characterized in that: A mating screw groove (802) is provided at the center of the inner side of the tail sealing end cap (801). The docking groove (802) is adapted to the docking thread (705) at the tail of the auxiliary tube (702) for threaded connection, and is used to connect the tail sealing end cap (801) and the auxiliary tube (702), providing a stable connection between the activated carbon rod (5) and the PP cotton sleeve (6).

7. The PP cotton activated carbon composite filter element according to claim 6, characterized in that: Anti-slip strips (803) are also provided at equal intervals on the outer wall of the tail sealing end cap (801), which provide an anti-slip function during the rotation of the tail sealing end cap (801).

8. The PP cotton activated carbon composite filter element according to claim 4, characterized in that: An auxiliary structure is also provided in the auxiliary tube (702), which is used to further purify the water that has been purified by the composite filter body; The auxiliary structure includes a receiving cavity (901) and a water-permeable purification membrane (902); the receiving cavity (901) is disposed in the auxiliary tube (702), and the opening of the receiving cavity (901) extends to the tail end of the auxiliary tube (702); The containment cavity (901) contains a water-permeable purification membrane (902), which further purifies and filters the purified water.

9. The PP cotton activated carbon composite filter element according to claim 8, characterized in that: The receiving cavity (901) is provided in four sets at equal intervals in the auxiliary tube (702), and the receiving cavity (901) is connected to the flow hole body (706); A connector (903) is fixedly provided at one end of the water-permeable purification membrane (902). The connector (903) is set as an arc strip. After the four sets of water-permeable purification membranes (902) are installed in the receiving cavity (901), the arc strip at one end of the water-permeable purification membrane (902) forms an annular strip, which contacts the tail end of the auxiliary tube (702).

10. A processing method for a PP cotton activated carbon composite filter element according to any one of claims 1-9, characterized in that: The processing technology is as follows: S1: Made from polypropylene granules as raw material, it is produced by melt extrusion and spin forming process to form a gradient microporous structure; S2: Using coconut shell / coal-based activated carbon as raw material, an adsorption layer is formed through compression; S3: The PP cotton sleeve (6) and the activated carbon rod (5) are sleeved together to form a composite filter body. Then the front sealing end cap (701) is clamped at the front end of the composite filter body, and the pre-positioning clamp head (704) inside the front sealing end cap (701) is clamped in the pre-positioning groove (61) on the outer side of the front end of the composite filter body. At the same time, the auxiliary tube (702) is inserted into the composite filter body, and the tail end of the auxiliary tube (702) reaches the tail end position of the composite filter body. S4: Use the tail end cap (801) to seal the tail end of the composite filter body. Connect the threaded groove (802) at the center of the tail end cap (801) to the threaded part (705) at the tail of the auxiliary tube (702) and tighten it.

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