Composite filter element and water purifier

Abstract

The composite filter element comprises a first filter assembly, the first filter assembly comprises a filter element cover, an upper end cover, a filter element, an inner cylinder and a water outlet pipe, the upper end cover is connected with the filter element cover, and a first insertion groove is formed in the upper end cover; a second slot is formed in the inner cylinder; one end of the water outlet pipe is inserted into the first slot, a first sealing ring is arranged between the water outlet pipe and the first slot, the other end of the water outlet pipe is inserted into the second slot, and a second sealing ring is arranged between the other end of the water outlet pipe and the second slot. According to the technical scheme, the filter element cover is in sealed connection with the upper end cover, the first sealing ring is arranged between the water outlet pipe and the groove wall of the first insertion groove, and the second sealing ring is arranged between the water outlet pipe and the groove wall of the second insertion groove, so that an internal waterway of the water outlet pipe and an external waterway of the water outlet pipe are sealed; on the premise of meeting the requirement for miniaturization of the composite filter element, water paths between the front filter element and the rear filter element do not leak water mutually, and the purity of filtered water is guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of water purification, and in particular to a composite filter element and a water purifier. Background Art

[0002] The integration and compounding of filter elements of existing water purification equipment is the development trend of water purification equipment in the future. Integrating the pre-filter element, reverse osmosis filter element and post-filter element into a filtration unit can reduce the overall size of the water purification equipment, reduce the space occupied by the water purification equipment, and realize the miniaturization of the water purification equipment.

[0003] After the pre-filter element and the post-filter element are assembled, the inlet and outlet water flow paths of the pre-filter element and the inlet and outlet water flow paths of the post-filter element are all set in the filter bottle. If the flow paths are not set reasonably or the sealing between the flow paths is poor, water will seep into each other between the flow paths, and the purified water after filtration will contain impurities. Summary of the invention

[0004] The main purpose of the present invention is to provide a composite filter element with detachable filter material, which is intended to prevent water from seeping into each other between the inlet and outlet flow paths of the front filter element and the rear filter element.

[0005] To achieve the above object, the composite filter element proposed in the present invention includes a first filter component, wherein the first filter component includes:

[0006] A filter element cover, wherein the filter element cover is provided with a post-filter element water outlet;

[0007] An upper end cover, the upper end cover is sealed to the filter element cover, and a first slot is provided on a side of the upper end cover away from the filter element cover;

[0008] A filter element, comprising a pre-filter element and a post-filter element, wherein the upper end of the pre-filter element is connected to the upper end cover;

[0009] An inner cylinder, wherein a water inlet of a post-filter is provided on the outer periphery of the inner cylinder, the post-filter is located inside the inner cylinder, the upper end of the inner cylinder is connected to the lower end of the pre-filter, and a second slot is provided on a side of the inner cylinder close to the pre-filter;

[0010] A water outlet pipe, one end of which is inserted into the first slot and a first sealing ring is provided between the water outlet pipe and the first slot, and the other end of which is inserted into the second slot and a second sealing ring is provided between the other end of the water outlet pipe and the second slot;

[0011] The water source entering from the water inlet of the post-filter element is filtered by the post-filter element, and the filtered water flows out from the water outlet of the post-filter element through the water outlet pipe.

[0012] In one embodiment, a first annular groove is formed on a groove wall of the first insertion slot, and the first sealing ring is disposed in the first annular groove.

[0013] In one embodiment, the first annular groove passes through the lower end surface of the filter element cover, and the first annular groove has a first notch on the side facing the post-filter element. The first filter assembly also includes a first welding plate, which is connected to the filter element cover and blocks the first notch.

[0014] In one embodiment, the first welding sheet is welded to the filter element cover.

[0015] In one embodiment, the inner cylinder includes a partition plate and a cylinder body connected to each other, the partition plate is used to separate the pre-filter element and the post-filter element, the partition plate is provided with a protrusion toward the pre-filter element, and the second slot is opened on the protrusion.

[0016] In one embodiment, a second annular groove is formed on a groove wall of the second insertion slot, and the second sealing ring is disposed in the second annular groove.

[0017] In one embodiment, the second annular groove passes through the upper end surface of the raised portion, and the second annular groove has a second notch on the side facing the upper end cover. The first filter assembly also includes a second welding plate, the second welding plate is connected to the raised portion, and the second welding plate blocks the second notch.

[0018] In one embodiment, the second welding piece is welded to the protruding portion.

[0019] In one embodiment, an opening is provided on a side of the inner cylinder away from the pre-filter element, and the first filter assembly further comprises a lower end cover connected to the inner cylinder, one end of the post-filter element is connected to the partition plate, and the lower end cover is used to receive the other end of the post-filter element.

[0020] In one embodiment, the upper end cover has a connecting portion connected to the filter element cover, a third annular groove is formed on the outer periphery of the connecting portion, and a third sealing ring is provided between the third annular groove and the filter element cover.

[0021] In one embodiment, the filter element cover is further provided with a pre-filter element water inlet and a pre-filter element water outlet, the pre-filter element and the post-filter element are hollow, a first water passage is formed in the middle of the pre-filter element, a second water passage is formed in the middle of the post-filter element, the first water passage is connected to the pre-filter element water outlet; the water outlet pipe is located in the first water passage, and the second slot is connected to the second water passage.

[0022] In one embodiment, the length of the pre-filter element is greater than the length of the post-filter element, and the pre-filter element is located on the upper side of the post-filter element.

[0023] The present invention also proposes a water purifier, the water purifier comprises a composite filter element, the composite filter element comprises a first filter assembly, the first filter assembly comprises a filter element cover, an upper end cover, a filter element, an inner cylinder and a water outlet pipe, the filter element cover is provided with a rear filter element water outlet; the upper end cover is sealed with the filter element cover, and a first slot is provided on the side of the upper end cover away from the filter element cover; the filter element comprises a pre-filter element and a post-filter element, the upper end of the pre-filter element is connected to the upper end cover; the outer periphery of the inner cylinder is provided with a post-filter element water inlet, and the post-filter element is located at Inside the inner cylinder, the upper end of the inner cylinder is connected to the lower end of the pre-filter element, and a second slot is opened on the side of the inner cylinder close to the pre-filter element; one end of the water outlet pipe is inserted into the first slot and a first sealing ring is arranged between the water outlet pipe and the first slot, and the other end of the water outlet pipe is inserted into the second slot and a second sealing ring is arranged between the other end of the water outlet pipe and the second slot; the water source entering from the water inlet of the post-filter element is filtered by the post-filter element, and the filtered water flows out from the water outlet of the post-filter element through the water outlet pipe.

[0024] The technical solution of the present invention adopts the method of sealingly connecting the filter element cover with the upper end cover, and providing a first sealing ring between the water outlet pipe and the groove wall of the first slot, and providing a second sealing ring between the water outlet pipe and the groove wall of the second slot, so as to seal the internal water path of the water outlet pipe and the external water path of the water outlet pipe. Under the premise of satisfying the miniaturization setting of the composite filter element, the water paths between the front filter element and the rear filter element are prevented from leaking into each other, thereby ensuring the purity of the filtered water. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] 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 some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0026] Figure 1 It is a schematic diagram of the structure of the composite filter element of the present invention;

[0027] Figure 2 It is a schematic diagram of the structure of the composite filter element in a cross-sectional perspective;

[0028] Figure 3 is a schematic structural diagram of a first filter assembly;

[0029] Figure 4 is an exploded view of the first filter component;

[0030] Figure 5 is a schematic structural diagram of the first filter assembly in a cross-sectional perspective;

[0031] Figure 6 for Figure 3 The enlarged view of point A in the middle;

[0032] Figure 7 for Figure 5 The enlarged view of point B in the middle;

[0033] Figure 8 for Figure 5 Enlarged view of point C in the middle;

[0034] Fig. 9 for Figure 5 Schematic diagram of the internal structure after removing the water outlet pipe, the first sealing ring, the second sealing ring, the first welding plate and the second welding plate;

[0035] Fig.10 an exploded view of the second filter assembly;

[0036] Fig.11 An exploded view of the filter cover assembly;

[0037] Fig.12 It is a schematic diagram of the structure of the filter element cover and the filter element handle.

[0038] Description of Figure Numbers:

[0039]

[0040]

[0041] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0042] 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.

[0043] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0044] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, if the meaning of "and / or" appearing in the full text is to include three parallel schemes, taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme that satisfies both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0045] The present invention provides a composite filter element 10, which is used to be installed in a water purification device to filter raw water (ie, tap water) passing through the composite filter element so that the water quality meets the needs of the user before being used by the user.

[0046] See also Figure 1 , Figure 2 , Fig.10 and Fig.11 The composite filter element 10 proposed in the present invention includes a filter bottle 100, a first filter component 200, a second filter component 300, and a filter cover component 400; a receiving chamber 110 is formed inside the filter bottle 100, the first filter component 200 and the second filter component 300 are arranged in the receiving chamber 110, and the first filter component 200 is located inside the second filter component 300, or the second filter component 300 is located inside the first filter component 200. It should be noted that the first filter component 200 and the second filter component 300 are respectively arranged in two independent chambers in the filter bottle 100. The filter bottle 100 is arranged in a barrel shape, and its upper end is open, and the filter cover component 400 covers the open end. The filter cover component 400 is provided with at least one water inlet end and at least one water outlet end, and the at least one water inlet end and the at least one water outlet end are both connected to the receiving chamber 110.

[0047] Specifically, the filter bottle 100 is used to be installed in a water purification device, and the second filter component 300 and the first filter component 200 are both arranged in the accommodating cavity 110 of the filter bottle 100; the first filter component 200 will filter out impurities contained in the water and / or improve the taste of the water, and the second filter component 300 will filter out various salt ions and other solutes in the water, thereby reducing the concentration of various salt ions and other solutes in the water and reducing the TDS value of the raw water.

[0048] The second filter assembly 300 includes a reverse osmosis filter element 310, a central tube 340, a reverse osmosis top cover 320 and a reverse osmosis bottom cover 330. The reverse osmosis filter element 310 is sleeved on the outer wall of the central tube 340, and the reverse osmosis filter element 310 is arranged between the reverse osmosis top cover 320 and the reverse osmosis bottom cover 330. The upper end and the lower end of the reverse osmosis filter element 310 are fixed by the reverse osmosis top cover 320 and the reverse osmosis bottom cover 330. Furthermore, the reverse osmosis top cover 320 and the reverse osmosis bottom cover 330 are also provided with a reverse osmosis filter element groove for the end of the reverse osmosis filter element 310 to be embedded; thus, the reverse osmosis top cover 320 and the reverse osmosis bottom cover 330 jointly fix the reverse osmosis filter element 310 in the filter bottle 100.

[0049] The filter cover assembly 400 includes a filter bottle cover 410 , a filter bottle handle 420 and a decorative cover 430 . The filter bottle handle 420 is rotatably connected to the filter bottle cover 410 , and the decorative cover 430 covers the filter bottle cover 410 .

[0050] In the embodiment of the present invention, Figures 3 to 9 As shown, the composite filter element 10 includes a first filter component 200, which includes a filter element cover 210, an upper end cover 250, a filter element 220, an inner cylinder 280 and a water outlet pipe 230. The filter element cover 210 is provided with a post-filter element water outlet 213; the upper end cover 250 is sealed with the filter element cover 210, and a first slot 214 is provided on the side of the upper end cover 250 away from the filter element cover 210; the filter element 220 includes a pre-filter element 221 and a post-filter element 222, and the upper end of the pre-filter element 221 is connected to the upper end cover 250; the inner cylinder 280 is provided with a post-filter element water inlet 282a on its outer periphery, and the post-filter element 222 is located inside the inner cylinder 280. The upper end of the inner cylinder 280 is connected to the lower end of the pre-filter element 221, and a second slot 281a1 is provided on a side of the inner cylinder 280 close to the pre-filter element 221; one end of the water outlet pipe 230 is inserted into the first slot 214 and a first sealing ring 510 is provided between the water outlet pipe 230 and the first slot 214, and the other end of the water outlet pipe 230 is inserted into the second slot 281a1 and a second sealing ring 520 is provided between the other end of the water outlet pipe 230 and the second slot 281a1; the water source entering from the water inlet 211 of the post-filter element is filtered by the post-filter element 222, and the filtered water flows out from the water outlet 213 of the post-filter element through the water outlet pipe 230.

[0051] Specifically, the composite filter element 10 includes a first filter assembly 200, and the composite filter element 10 is integrated and arranged in the filter bottle 100. Correspondingly, the first filter assembly 200 is also integrated. In this embodiment, the filter element 220 includes at least a pre-filter element 221 and a post-filter element 222. In addition, the composite filter element 10 may also include a reverse osmosis filter element 310.

[0052] It should be noted that the first filter assembly 200 includes a filter element cover 210. Considering that the life of the pre-filter element 221 is short and the pre-filter element 221 needs to be replaced after a certain period of use, the filter element cover 210 is provided with a filter element handle 270 that rotates with the pre-filter element 221. The entire first filter assembly 200 is lifted out of the central tube 340 by the filter element handle 270, so that the first filter assembly 200 is easy to replace. Considering that the service life of the reverse osmosis filter element 310 is much longer than the service life of the pre-filter element 221, in order to avoid the reverse osmosis filter element 310 from being replaced before the service life is reached, only the first filter assembly 200 can be replaced when replacing, and the second filter assembly 300 is not replaced, which reduces the replacement cost and makes full use of the reverse osmosis filter element 310 in the second filter assembly 300.

[0053] Furthermore, considering that there are different flow paths in the filter element cover 210 and the upper end cover 250, in order to avoid interference between the flow paths, prevent water from seeping into each other, or prevent the first filter assembly 200 from leaking to the outside, in this embodiment, the upper end cover 250 and the filter element cover 210 are sealed and connected. Of course, the upper end cover 250 and the filter element cover 210 can be glued or welded. The upper end cover 250 is connected to the filter element 220 for fixing the filter element 220, wherein the filter element 220 includes a pre-filter element 221 and a post-filter element 222. The upper end cover 250 can be connected to the pre-filter element 221, or to the post-filter element 222, or to both the pre-filter element 221 and the post-filter element 222, and no specific limitation is made here.

[0054] Among them, the inner cylinder 280 is sealed and connected to the central tube 340 outside the first filter component 200, and the inner cylinder 280 is located between the pre-filter element 221 and the post-filter element 222. The inner cylinder 280 is mainly used to separate the pre-filter element 221 and the post-filter element 222 to ensure that the water flow path through the pre-filter element 221 and the water flow path through the post-filter element 222 do not interfere with each other.

[0055] In addition, considering the influence of external water inflow on the post filter element 222, the post filter element 222 is arranged inside the inner cylinder 280 to prevent the post filter element 222 from being deformed by water pressure. The inner cylinder 280 divides the center tube 340 into two mutually unconnected first filter chamber and second filter chamber. In this embodiment, the first filter chamber is enclosed by the filter element cover 210, the upper end cover 250, the center tube 340 and the inner cylinder 280, and the second filter chamber is enclosed by the inner cylinder 280 and the center tube 340. The pre filter element 221 is located in the first filter chamber, and the post filter element 222 is located in the second filter chamber.

[0056] The pre-filter element 221 is generally the first water purification step of the water purifier, which is used to filter out larger particles or floating objects in the water, and the post-filter element 222 is generally the last water purification step of the water purifier, which is used to adjust the taste of the purified water. The pre-filter element 221 and the post-filter element 222 can be arranged in a cylindrical shape. When the pre-filter element 221 and the post-filter element 222 are arranged in a cylindrical shape, the pre-filter element 221 and the post-filter element 222 can be arranged up and down, that is, the pre-filter element 221 is located on the upper side of the post-filter element 222 or the post-filter element 222 is located on the upper side of the pre-filter element 221; the pre-filter element 221 and the post-filter element 222 can also be arranged inside and outside, that is, the pre-filter element 221 is located inside the post-filter element 222 or the post-filter element 222 is located inside the pre-filter element 221.

[0057] It should also be noted that the water outlet pipe 230 is used to discharge the filtered water in the post-filter element 222. When the first filter assembly 200 is in use, the water outlet pipe 230 has a waterway connected to the pre-filter element 221. The filter element cover 210 is provided with a first slot 214 corresponding to the water outlet pipe 230. One end of the water outlet pipe 230 is inserted into the first slot 214, and the first slot 214 is connected to the water outlet 213 of the post-filter element. The caliber of the first slot 214 is substantially consistent with the outer diameter of the water outlet pipe 230, so that the first slot 214 can better limit the water outlet pipe 230. Considering that the water outlet pipe 230 should be separated from the first water passage 221a, a first sealing ring 510 is provided between the water outlet pipe 230 and the first slot 214. The first sealing ring 510 separates the water outlet pipe 230 from the external waterway to prevent the water outlet pipe 230 from leaking or seeping. The inner cylinder 280 is provided with a second slot 281a1 corresponding to the water outlet pipe 230. The diameter of the second slot 281a1 is substantially consistent with the outer diameter of the water outlet pipe 230, so that the second slot 281a1 can better limit the water outlet pipe 230. Considering that the water outlet pipe 230 should be separated from the second water passage 222a, a second sealing ring 520 is provided between the water outlet pipe 230 and the second slot 281a1, and the water outlet pipe 230 is separated from the external waterway by the second sealing ring 520 to prevent water leakage from the water outlet pipe 230. Water flows in from the water inlet of the second filter element 220, is filtered by the second filter element 220, and then flows out from the water outlet 213 of the post-filter element through the water outlet pipe 230.

[0058] In addition, the number of the first sealing rings 510 in this embodiment is two, but not limited to this embodiment, the number of the first sealing rings 510 can be one, three, or more. The number of the second sealing rings 520 in this embodiment is two, but not limited to this embodiment, the number of the second sealing rings 520 can be one, three, or more.

[0059] The technical solution of the present invention adopts a sealing connection between the filter element cover 210 and the upper end cover 250, and a first sealing ring 510 is provided between the water outlet pipe 230 and the groove wall of the first slot 214, and a second sealing ring 520 is provided between the water outlet pipe 230 and the groove wall of the second slot 281a1, so as to seal the internal water path of the water outlet pipe 230 and the external water path of the water outlet pipe 230. Under the premise of satisfying the miniaturization setting of the composite filter element 10, the water paths between the pre-filter element 221 and the post-filter element 222 are water-proof to each other, thereby ensuring the purity of the filtered water.

[0060] In one embodiment, see Figure 7 and Fig. 9 A first annular groove 214a is formed on the groove wall of the first insertion slot 214, and the first sealing ring 510 is disposed in the first annular groove 214a.

[0061] Considering that the first sealing ring 510 has a certain thickness, in order to ensure good sealing of the water outlet pipe 230, the distance between the water outlet pipe 230 and the groove wall of the first insertion slot 214 is very close. In view of this, it is difficult to directly arrange the first sealing ring 510 between the water outlet pipe 230 and the first insertion slot 214. In this embodiment, a first annular groove 214a is provided on the groove wall of the first insertion slot 214, and the first sealing ring 510 is arranged in the first annular groove 214a. In this embodiment, part of the first sealing ring 510 is located in the first annular groove 214a, and the other part of the first sealing ring 510 extends out of the first annular groove 214a and abuts against the water outlet pipe 230. In this arrangement, the outer periphery of the water outlet pipe 230 can be well sealed.

[0062] Further, in one embodiment, see Figure 7 and Fig. 9 The first annular groove 214a passes through the lower end surface of the filter element cover 210, and the first annular groove 214a has a first notch 214a1 on the side facing the post-filter element 222. The first filter assembly 200 also includes a first welding piece 241, which is connected to the filter element cover 210 and blocks the first notch 214a1.

[0063] According to the previous embodiment, a first annular groove 214a is provided on the groove wall of the first insertion slot 214. Considering that if the lower end surface of the filter element cover 210 is not penetrated, the first annular groove 214a is directly provided on the first groove wall. This method of providing is difficult to process and has high cost. Therefore, the first annular groove 214a is provided through the lower end surface of the filter element cover 210, and the first annular groove 214a is provided on the side facing the post filter element 222 to form a first notch 214a1. After the first notch 214a1 is formed, the first sealing ring 510 is easy to fall off from the first notch 214a1. In view of this, the first filter assembly 200 further includes a first welding sheet 241, and the first welding sheet 241 is connected to the filter element cover 210. The first welding sheet 241 blocks the first notch 214a1 to prevent the first sealing ring 510 from falling off from the first notch 214a1. The first welding piece 241 and the filter element cover 210 may be connected by welding, gluing, or integrally formed in a molten state. The connection method between the first welding piece 241 and the filter element cover 210 is not specifically limited herein.

[0064] Optionally, in one embodiment, see Figure 7 and Fig. 9 , the first welding sheet 241 is welded to the filter element cover 210 .

[0065] In the above embodiment, there are multiple ways to connect the first welding sheet 241 and the filter cover 210. In this embodiment, the first welding sheet 241 and the filter cover 210 are fixed by welding. This fixing method has better sealing performance and will not affect its connection strength due to waterway erosion compared to gluing. Therefore, welding is selected for fixing. It should be noted that the first welding sheet 241 and the filter cover 210 are both made of plastic. In view of this, the specific welding method is ultrasonic welding, that is, the welding sheet and the filter cover 210 are welded together by an ultrasonic instrument.

[0066] In one embodiment, see Figures 3 to 5 The inner cylinder 280 includes a partition plate 281 and a cylinder body 282 connected to each other. The partition plate 281 is used to separate the pre-filter element 221 and the post-filter element 222. The partition plate 281 is provided with a protrusion 281a toward the pre-filter element 221, and the second slot 281a1 is opened on the protrusion 281a.

[0067] It should be noted that the partition includes a connected partition plate 281 and a cylinder 282, and the partition plate 281 and the cylinder 282 can be connected by welding or melted into one. The cylinder 282 is used to protect the structure of the post filter element 222 to prevent the post filter element 222 from being deformed by water pressure. Considering that the thickness of the partition plate 281 is relatively thin, it is difficult to form a deeper second slot 281a1 for limiting the outlet pipe 230. In view of this, the partition plate 281 is provided with a protrusion 281a toward the pre-filter element 221, and the second slot 281a1 is opened on the protrusion 281a.

[0068] In one embodiment, see Figure 8 and Fig. 9 A second annular groove 281a2 is formed on the groove wall of the second insertion slot 281a1, and the second sealing ring 520 is disposed in the second annular groove 281a2.

[0069] Considering that the second sealing ring 520 has a certain thickness, in order to ensure good sealing of the water outlet pipe 230, the distance between the water outlet pipe 230 and the groove wall of the second slot 281a1 is very close. In view of this, it is difficult to directly arrange the second sealing ring 520 between the water outlet pipe 230 and the second slot 281a1. In this embodiment, a second annular groove 281a2 is provided on the groove wall of the second slot 281a1, and the second sealing ring 520 is arranged in the second annular groove 281a2. In this embodiment, part of the second sealing ring 520 is located in the second annular groove 281a2, and the other part of the second sealing ring 520 extends out of the second annular groove 281a2 and abuts against the water outlet pipe 230. In this arrangement, the outer periphery of the water outlet pipe 230 can be well sealed.

[0070] Further, in one embodiment, see Figure 8 and Fig. 9 The second annular groove 281a2 passes through the upper end surface of the raised portion 281a, and the second annular groove 281a2 has a second notch 281a3 on the side facing the upper end cover 250. The first filter component 200 also includes a second welding plate 242, which is connected to the raised portion 281a, and the second welding plate 242 blocks the second notch 281a3.

[0071] According to the previous embodiment, a second annular groove 281a2 is formed on the groove wall of the second slot 281a1. Considering that if the upper end surface of the protrusion 281a is not penetrated, and the second annular groove 281a2 is directly formed on the second groove wall, the process difficulty and cost of this opening method are relatively high, so the second annular groove 281a2 is penetrated through the upper end surface of the protrusion 281a, and the second annular groove 281a2 forms a second notch 281a3 on the side facing the upper end cover 250. After the second notch 281a3 is formed, the second sealing ring 520 is easy to fall off from the second notch 281a3. In view of this, the first filter assembly 200 also includes a second welding piece 242, and the second welding piece 242 is connected to the filter element cover 210. The second welding piece 242 is used to block the second notch 281a3 to prevent the second sealing ring 520 from falling off from the second notch 281a3. The second welding piece 242 and the raised portion 281a may be connected by welding, gluing, or integrally formed in a molten state. The connection method between the second welding piece 242 and the raised portion 281a is not specifically limited herein.

[0072] Optionally, in one embodiment, see Figure 5 and Figure 8 , the second welding piece 242 is welded to the raised portion 281a.

[0073] In the above embodiment, there are many ways to connect the second welding piece 242 and the protrusion 281a. In this embodiment, the second welding piece 242 and the protrusion 281a are fixed by welding. This fixing method has better sealing performance and will not affect its connection strength due to waterway erosion compared to adhesive bonding. Therefore, welding is selected for fixing. It should be noted that the second welding piece 242 and the inner cylinder 280 are both made of plastic. In view of this, the specific welding method is ultrasonic welding, that is, the second welding piece 242 and the filter element cover 210 are welded together by an ultrasonic instrument.

[0074] In one embodiment, see Figure 5 The inner cylinder 280 is provided with an opening 282b on one side away from the pre-filter element 221. The first filter assembly 200 also includes a lower end cover 260, which is connected to the inner cylinder 280. One end of the post-filter element 222 is connected to the partition plate 281, and the lower end cover 260 is used to receive the other end of the post-filter element 222.

[0075] Specifically, an opening 282b is provided on one side of the inner cylinder 280 away from the pre-filter element 221, wherein the opening 282b is provided for loading the post-filter element 222 into the inner cylinder 280. After the post-filter element 222 is loaded into the inner cylinder 280, the lower end cover 260 is inserted into the inner cylinder 280 from the opening 282b, and the lower end cover 260 is interference fit with the inner wall of the inner cylinder 280. One end of the post-filter element 222 is connected to the partition plate 281, and the connection method here is adhesive bonding, and the lower end cover 260 is used to receive the other end of the post-filter element 222, wherein the lower end cover 260 may be connected to the post-filter element 222, or may not be connected to the post-filter element 222.

[0076] In one embodiment, see Figure 4 and Figure 5 The upper end cover 250 has a connecting portion 253 connected to the filter element cover 210 , a third annular groove 253 a is formed on the outer periphery of the connecting portion 253 , and a third sealing ring 530 is provided between the third annular groove 253 a and the filter element cover 210 .

[0077] According to the above embodiment, the upper end cover 250 is sealed and connected with the filter element cover 210, wherein the upper end cover 250 has a connecting portion 253 that cooperates with the filter element cover 210, and the specific sealing connection method is that a third sealing ring 530 is arranged between the connecting portion 253 and the filter element cover 210. Considering that the distance between the filter element cover 210 and the connecting portion 253 is relatively close, and the third sealing ring 530 has a certain thickness, it is difficult to directly arrange the third sealing ring 530 between the filter element cover 210 and the connecting portion 253. In view of this, a third annular groove 253a is opened on the outer periphery of the connecting portion 253, and a third sealing ring 530 is arranged between the third annular groove 253a and the filter element cover 210. In this embodiment, a portion of the third sealing ring 530 is located in the third annular groove 253a, and another portion extends out of the notch of the third annular groove 253a and abuts against the inner wall of the filter element cover 210, so that a better seal can be achieved, so that the water path between the filter element cover 210 and the upper end cover 250 is watertight.

[0078] In addition, the third annular groove 253a can also be provided on the inner wall of the filter element cover 210 corresponding to the connecting portion 253. The number of the third annular groove 253a is one in this embodiment, but it can also be two, three or more. The number of the third sealing rings 530 is two in this embodiment, but it is not limited to this embodiment. The number of the third sealing rings 530 can be one, three or more.

[0079] In one embodiment, see Figure 4 , Figure 6 and Fig.12The filter element cover 210 is also provided with a pre-filter element water inlet 211 and a pre-filter element water outlet 212. The pre-filter element 221 and the post-filter element 222 are hollow. A first water passage 221a is formed in the middle of the pre-filter element 221, and a second water passage 222a is formed in the middle of the post-filter element 222. The first water passage 221a is connected to the pre-filter element water outlet 212; the water outlet pipe 230 is located in the first water passage 221a, and the second slot 281a1 is connected to the second water passage 222a.

[0080] In this embodiment, the pre-filter element 221 and the post-filter element 222 are hollow, and in view of this, a first water passage 221a is formed in the middle of the pre-filter element 221, and a second water passage 222a is formed in the middle of the post-filter element 222. The central tube 340 is located outside the first filter assembly 200, and a water passage gap is formed between the central tube 340 and the pre-filter element 221, and the water passage gap is connected to the pre-filter element water inlet 211, and the first water passage 221a is connected to the pre-filter element water outlet 212, so that the raw water (tap water) entering from the pre-filter element 221 flows through the water gap and is filtered by the pre-filter element 221 to form primary filtered water, and the primary filtered water flows through the first water passage 221a and flows from the pre-filter element water outlet 212. In addition, a post-filter water inlet 282a is provided on the inner cylinder 280. Water flowing in from the post-filter water inlet 282a is filtered by the post-filter 222 to obtain purified water. The purified water flows through the second water passage 222a and flows out from the post-filter water outlet 213 through the outlet pipe 230.

[0081] In one embodiment, see Figure 4 and Figure 5 The length of the pre-filter element 221 is greater than the length of the post-filter element 222 , and the pre-filter element 221 is located on the upper side of the post-filter element 222 .

[0082] In the above embodiment, an optional embodiment has the pre-filter element 221 and the post-filter element 222 arranged inside and outside. Considering that the pre-filter element 221 is used to filter larger particles or floating flocs, and the post-filter element 222 is only used to adjust the taste, the length of the pre-filter element 221 is set to be greater than the length of the post-filter element 222. In this way, the pre-filter element 221 and the post-filter element 222 are arranged inside and outside, which will waste more space. In this embodiment, the pre-filter element 221 and the post-filter element 222 are arranged up and down, specifically, the pre-filter element 221 is arranged above the post-filter element 222.

[0083] The present invention also proposes a water purifier, which includes a composite filter element 10. The specific structure of the composite filter element 10 refers to the above embodiment. Since the water purifier adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be repeated here one by one.

[0084] The above descriptions are only optional embodiments of the present invention, and are not intended to limit the patent scope of the present invention. All equivalent structural changes made using the contents of the present invention's specification and drawings, or directly / indirectly applied in other related technical fields, are included in the patent protection scope of the present invention.

Claims

1. A composite filter element, characterized in that: The invention comprises a first filter assembly, wherein the first filter assembly comprises: A filter element cover, wherein the filter element cover is provided with a post-filter element water outlet; An upper end cover, the upper end cover is sealed to the filter element cover, and a first slot is provided on a side of the upper end cover away from the filter element cover; A filter element, comprising a pre-filter element and a post-filter element, wherein the upper end of the pre-filter element is connected to the upper end cover; An inner cylinder, wherein a water inlet of a post-filter is provided on the outer periphery of the inner cylinder, the post-filter is located inside the inner cylinder, the upper end of the inner cylinder is connected to the lower end of the pre-filter, and a second slot is provided on a side of the inner cylinder close to the pre-filter; A water outlet pipe, one end of which is inserted into the first slot and a first sealing ring is provided between the water outlet pipe and the first slot, and the other end of which is inserted into the second slot and a second sealing ring is provided between the other end of the water outlet pipe and the second slot; The water source entering from the water inlet of the post-filter element is filtered by the post-filter element, and the filtered water flows out from the water outlet of the post-filter element through the water outlet pipe.

2. The composite filter element according to claim 1, characterized in that: A first annular groove is formed on the groove wall of the first insertion slot, and the first sealing ring is arranged in the first annular groove.

3. The composite filter element according to claim 2, characterized in that: The first annular groove passes through the lower end surface of the filter element cover, and the first annular groove has a first notch on the side facing the post-filter element. The first filter assembly also includes a first welding plate, which is connected to the filter element cover and blocks the first notch.

4. The composite filter element according to claim 3, characterized in that: The first welding sheet is welded to the filter element cover.

5. The composite filter element according to claim 1, characterized in that: The inner cylinder comprises a partition plate and a cylinder body connected to each other, the partition plate is used to separate the pre-filter element and the post-filter element, the partition plate is provided with a protrusion facing the pre-filter element, and the second slot is opened in the protrusion.

6. The composite filter element according to claim 5, characterized in that: A second annular groove is formed on the groove wall of the second insertion slot, and the second sealing ring is arranged in the second annular groove.

7. The composite filter element according to claim 6, characterized in that: The second annular groove passes through the upper end surface of the protrusion, and the second annular groove has a second notch on the side facing the upper end cover. The first filter assembly also includes a second welding plate, which is connected to the protrusion and blocks the second notch.

8. The composite filter element according to claim 7, characterized in that: The second welding piece is welded to the protruding portion.

9. The composite filter element according to claim 5, characterized in that: The inner cylinder has an opening on one side away from the front filter element. The first filter assembly also includes a lower end cover connected to the inner cylinder. One end of the rear filter element is connected to the partition plate, and the lower end cover is used to receive the other end of the rear filter element.

10. The composite filter element according to claim 1, characterized in that: The upper end cover has a connecting portion connected to the filter element cover, a third annular groove is formed on the outer periphery of the connecting portion, and a third sealing ring is provided between the third annular groove and the filter element cover.

11. The composite filter element according to claim 1, characterized in that: The filter element cover is also provided with a pre-filter element water inlet and a pre-filter element water outlet. The pre-filter element and the post-filter element are hollow. A first water passage is formed in the middle of the pre-filter element, and a second water passage is formed in the middle of the post-filter element. The first water passage is connected to the pre-filter element water outlet; the water outlet pipe is located in the first water passage, and the second slot is connected to the second water passage.

12. The composite filter element according to claim 1, characterized in that: The length of the front filter element is greater than that of the rear filter element, and the front filter element is located on the upper side of the rear filter element.

13. A water purifier, characterized in that: Comprising the composite filter element as described in any one of claims 1 to 12.

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