Composite filter element and water purifier

Abstract

The invention discloses a composite filter element and a water purifier, the composite filter element comprises a first filter assembly, and the first filter assembly comprises a filter element cover, an upper end cover, a filter element and a limiting piece; the upper end cover is movably connected with the filter element cover and can move up and down relative to the filter element cover; the upper end cover is fixedly connected with the filter element, the limiting piece corresponds to the step part, a moving space is formed between the limiting piece and the step part, and the limiting piece is located on the lower side of the step part and used for limiting the step part. According to the technical scheme, the upper end cover is movably connected with the filter element cover, and the upper end cover is fixedly connected with the filter element, so that the upper end cover and the filter element can move relative to the filter element cover; and the limiting piece is arranged for limiting the step part on the filter element cover, and a movable space is formed between the step part and the limiting piece, so that the lower part of the filter element can integrally slide downwards when being pulled, and the filter element is prevented from being deformed or torn due to excessive pulling force.

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] As people pursue a better quality of life, the quality of drinking water has begun to attract much attention. Reverse osmosis water purification devices are becoming more and more popular because the purified water they produce is fresher, more hygienic and safer.

[0003] The filter element in an existing water purifier is usually fixed to its filter element cover. When the water purifier starts working, the filter element will gradually fill with water. Since the lower part of the filter element contains a large amount of water, a large pulling force will be exerted on the upper filter element. The filter element may be deformed or torn by the pulling force. Summary of the invention

[0004] The main purpose of the present invention is to provide a composite filter element, which is intended to prevent the filter element from being deformed or torn due to pulling force after being filled with water.

[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, the filter element cover is located at the upper end of the first filter assembly, and a connecting column connected to the filter element cover is provided at the lower side of the filter element cover;

[0007] An upper end cover, the upper end cover is movably connected to the filter element cover, and the upper end cover can move up and down relative to the filter element cover; a through hole is provided in the middle of the upper end cover, the connecting column extends into the through hole, and the upper end cover is provided with a step portion toward the connecting column;

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

[0009] An inner cylinder, the lower end of the front filter element is connected to the inner cylinder, and the rear filter element is located inside the inner cylinder;

[0010] A limiting member, wherein the limiting member is connected to the connecting column, the limiting member is arranged corresponding to the step portion, a movable space is provided between the limiting member and the step portion, the limiting member is located at the lower side of the step portion, and the limiting member is used to limit the step portion.

[0011] In one embodiment, the limiting member includes a welding portion and a receiving portion connected to each other, the welding portion is connected to the connecting column, and the receiving portion extends to the outside of the outer periphery of the connecting column.

[0012] In one embodiment, the number of the receiving portions is set to be multiple, and the multiple receiving portions are arranged at intervals on the outer circumference of the welding portion.

[0013] In one embodiment, the welding portion is welded to the connecting column.

[0014] In one embodiment, the filter element cover is provided with a pre-filter element water inlet, a pre-filter element water outlet and a post-filter element water outlet, the inner cylinder is provided with a post-filter element water inlet, the pre-filter element is hollow, a first water passage is formed in the middle of the pre-filter element, water flowing in from the pre-filter element water inlet is filtered by the pre-filter element and then flows out from the first water outlet through the first water passage, and the first filter assembly further includes:

[0015] A water outlet pipe, wherein the water outlet pipe is located in the first water passage, one end of the water outlet pipe is connected to the filter element cover, and one end of the water outlet pipe is connected to the inner cylinder. Water flowing in from the water inlet of the rear filter element is filtered by the rear filter element and then flows out from the water outlet of the rear filter element through the water outlet pipe.

[0016] In one embodiment, the filter element cover is provided with a first slot corresponding to the water outlet pipe, one end of the water outlet pipe is inserted into the first slot, the first slot is connected to the water outlet of the rear filter element, a first annular groove is provided on the groove wall of the first slot, and the first sealing ring is arranged in the first annular groove.

[0017] In one embodiment, the inner cylinder includes a connected partition plate and a cylinder body, 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, the second slot is opened on the protrusion, a second annular groove is opened on the groove wall of the second slot, and the second sealing ring is arranged in the second annular groove.

[0018] In one embodiment, the first filter assembly further includes a second welding plate, the second welding plate is connected to the protrusion, the second welding plate is located at an upper end of the protrusion, and the second welding plate extends toward the pre-filter element.

[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 length of the post-filter element is between 1 / 2 and 1 / 4 of the length of the pre-filter element.

[0021] 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.

[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 at the upper end of the post-filter element.

[0023] In one embodiment, the length of the post-filter element is between 1 / 2 and 1 / 4 of the length of the pre-filter element.

[0024] 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 stopper, the filter element cover is located at the upper end of the first filter assembly, and a connecting column connected to it is provided on the lower side of the filter element cover; the upper end cover is movably connected to the filter element cover, and the upper end cover can move up and down relative to the filter element cover; a through hole is provided in the middle of the upper end cover, the connecting column extends into the through hole, and the upper end cover is provided with a step portion toward the filter element cover ; The filter element includes a pre-filter element and a post-filter element, the length of the pre-filter element is greater than that of the post-filter element, the pre-filter element is located at the upper end of the post-filter element, and one end of the pre-filter element is connected to the filter element cover; the other end of the pre-filter element is connected to the inner cylinder, and the post-filter element is located inside the inner cylinder; the limiter is connected to the connecting column, the limiter is arranged corresponding to the step portion, there is a movable space between the limiter and the step portion, the limiter is located at the lower side of the step portion, and the limiter is used to limit the step portion.

[0025] The technical solution of the present invention adopts the method of movably connecting the upper end cover with the filter element cover and fixedly connecting the upper end cover with the filter element, so that the upper end cover and the filter element can move relative to the filter element cover; and a limiting member is provided for limiting the step portion on the filter element cover, and a movable space is provided between the step portion and the limiting member, so that when the lower part of the filter element is subjected to tension, it can slide downward as a whole, thereby preventing it from being deformed or torn due to excessive tension. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] 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.

[0027] Figure 1 It is a schematic diagram of the structure of the composite filter element of the present invention;

[0028] Figure 2 It is a schematic diagram of the structure of the composite filter element in a cross-sectional perspective;

[0029] Figure 3 is a schematic structural diagram of a first filter assembly;

[0030] Figure 4 is an exploded view of the first filter component;

[0031] Figure 5 is a schematic structural diagram of the first filter assembly in a cross-sectional perspective;

[0032] Figure 6 for Figure 3 The enlarged view of point A in the middle;

[0033] Figure 7 for Figure 5 The enlarged view of point B in the middle;

[0034] Figure 8 for Figure 5 The enlarged view of point B in the middle;

[0035] Fig. 9 for Figure 5 Enlarged view of point C in the middle;

[0036] Fig.10 for Figure 5 Schematic diagram of the internal structure after removing the water outlet pipe, the first sealing ring, the second sealing ring, the stopper and the second welding piece;

[0037] Fig.11 It is a structural schematic diagram of a limiting member;

[0038] Fig.12 is an exploded view of the second filter assembly;

[0039] Fig.13 An exploded view of the filter cover assembly;

[0040] Fig.14 It is a schematic diagram of the structure of the filter element cover and the filter element handle (the filter element cover is separated from the filter element handle).

[0041] Description of Figure Numbers:

[0042]

[0043]

[0044] 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

[0045] 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.

[0046] 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.

[0047] 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.

[0048] The present invention provides a composite filter element 10 for installation in a water purifier to filter raw water (ie, tap water) passing therethrough so that the water quality meets the needs of the user before being used by the user.

[0049] See also Figure 1 , Figure 2 , Fig.10 and Fig.11The 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.

[0050] 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.

[0051] 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.

[0052] 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 .

[0053] In the embodiment of the present invention, Figures 3 to 9As shown, the composite filter element 10 includes a first filter assembly 200, the first filter assembly 200 includes a filter element cover 210, an upper end cover 250, a filter element 220 and a stopper 241, the filter element cover 210 is located at the upper end of the first filter assembly 200, and the filter element cover 210 is located at the upper end of the first filter assembly 200; the upper end cover 250 is movably connected to the filter element cover 210, and the upper end cover 250 can move up and down relative to the filter element cover 210; the upper end cover 250 is fixedly connected to the filter element 220 A through hole 255 is provided in the middle of the upper end cover 250, and the connecting column 215 extends into the through hole 255. The upper end cover 250 is provided with a step portion 254 toward the filter element cover 210; the limiting member 241 is connected to the connecting column 215, and the limiting member 241 is provided corresponding to the step portion 254. There is a movable space 290 between the limiting member 241 and the step portion 254, and the limiting member 241 is located at the lower side of the step portion 254, and the limiting member 241 is used to limit the step portion 254.

[0054] 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. The first filter assembly 200 includes a pre-filter element 221 and a post-filter element 222. The filter element 220 in this embodiment may include only the pre-filter element 221, only the post-filter element 222, or both the pre-filter element 221 and the post-filter element 222, which are not specifically limited here.

[0055] 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 time, the filter element cover 210 is provided with a filter element handle 270 that rotates with it. The entire first filter assembly 200 is lifted out of the cylinder 282 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 220 is much longer than the service life of the pre-filter element 221, in order to avoid the reverse osmosis filter element 220 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 220 in the second filter assembly 300.

[0056] Further, the upper end cover 250 is connected to the filter element cover 210. In this embodiment, the upper end cover 250 and the filter element cover 210 are sealed. Of course, the upper end cover 250 and the filter element cover 210 can be glued or welded, which is not specifically limited here. The upper end cover 250 is connected to the filter element 220 for fixing the filter element 220. 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, which is not specifically limited here.

[0057] It should be noted that when water is continuously injected from the water inlet, the water inside the filter element 220 will increase, and then the pulling force of the lower part of the filter element 220 on the upper part of the filter element 220 will become greater and greater. Considering that the upper end cover 250 is movably connected with the filter element cover 210, and the upper end cover 250 is fixedly connected with the filter element 220, the filter element 220 will drive the upper end cover 250 to move downward. In order to prevent the upper end cover 250 from falling off the filter element cover 210, a step portion 254 is provided on the filter element cover 210, and a limiting member 241 is provided on the upper end cover 250, and the limiting member 241 is located below the step portion 254, so that when the step portion 254 drops to a certain extent, the step portion 254 will abut against the limiting member 241.

[0058] When the chamber containing the filter element 220 is completely filled with water, the filter element 220 will float upwards because of its light material. At this time, the step portion 254 is separated from the stopper 241, and the filter element 220 drives the upper end cover 250 to move upward relative to the filter element cover 210. In view of this, the upper end cover 250 and the filter element 220 can move in the activity space 290.

[0059] The technical solution of the present invention adopts the method of movably connecting the upper end cover 250 with the filter element cover 210 and fixedly connecting the upper end cover 250 with the filter element 220, so that the upper end cover 250 and the filter element 220 can move relative to the filter element cover 210; and a limiting member 241 is provided for limiting the step portion 254 on the filter element cover 210, and a movable space 290 is provided between the step portion 254 and the limiting member 241, so that when the lower part of the filter element 220 is subjected to tension, it can slide downward as a whole, thereby preventing it from being deformed or torn due to excessive tension.

[0060] In one embodiment, see Figure 7 and Fig.11 The limiting member 241 includes a welding portion 241a and a receiving portion 241b connected to each other. The welding portion 241a is connected to the connecting column 215 , and the receiving portion 241b extends to the outside of the outer periphery of the connecting column 215 .

[0061] Specifically, further, the limiting member 241 includes a welding portion 241a and a receiving portion 241b connected to each other. In the present embodiment, the welding portion 241a and the receiving portion 241b are integrally formed. Of course, it is not limited to the present embodiment. The welding portion 241a and the receiving portion 241b can be connected by welding or by gluing. The welding portion 241a is at least connected to the end face of the bottom end of the connecting column 215. The connection method between the welding portion 241a and the connecting column 215 can be welding, gluing, or integrally formed in a molten state, which is not specifically limited here. It is considered that the receiving portion 241b is used to limit the step portion 254. The receiving portion 241b at least extends to the outside of the outer periphery of the connecting column 215. The receiving portion 241b is set in this way to limit the step portion 254.

[0062] In one embodiment, see Figure 4 , Figure 5 and Fig.11 The number of the receiving portions 241b is set to be multiple, and the multiple receiving portions 241b are arranged at intervals on the outer periphery of the welding portion 241a.

[0063] As described in the above embodiment, the receiving portion 241b extends to the outside of the outer periphery of the connecting column 215. In order to enhance the limiting effect of the receiving portion 241b, the receiving portion 241b is made as close to the filter element cover 210 as possible, so that the distance between the receiving portion 241b and the filter element cover 210 is small. Considering that a water path of the filter element 220 is formed between the connecting column 215 and the filter element cover 210, if the distance between the receiving portion 241b and the filter element cover 210 is small, the water path will be blocked, resulting in poor flow of the water path or occlusion of the water path. In this way, the number of the receiving portions 241b is set to multiple, and the multiple receiving portions 241b are arranged at intervals, so that the gaps formed between the receiving portions 241b can be used to keep the water path smooth. In this embodiment, the number of the receiving parts 241b is set to three, but not limited to this embodiment, the number of the receiving parts 241b can also be set to two, the number of the receiving parts 241b can also be set to four, or the number of the receiving parts 241b can also be set to more, as long as the receiving parts 241b do not affect the water circulation.

[0064] In one embodiment, see Figure 5 , the welding portion 241a is welded to the connecting column 215.

[0065] In the above embodiment, there are many ways to connect the welding part 241a and the connecting column 215. In this embodiment, the welding part 241a and the connecting column 215 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 stopper 241 and the filter element cover 210 are both made of plastic. In view of this, the specific welding method is ultrasonic welding, that is, the welding part 241a and the filter element cover 210 are welded together by an ultrasonic instrument.

[0066] In one embodiment, see Figure 5 The filter element 220 includes a pre-filter element 221 and a post-filter element 222, one end of the pre-filter element 221 is fixedly connected to the upper end cover 250, the first filter assembly 200 also includes an inner cylinder 280, the other end of the pre-filter element 221 is connected to the inner cylinder 280, and the post-filter element 222 is located inside the inner cylinder 280.

[0067] The filter element 220 in this embodiment includes a pre-filter element 221 and a post-filter element 222. One end of the pre-filter element 221 is fixedly connected to the upper end cover 250, and the specific connection method is adhesive bonding. In order to separate the pre-filter element 221 and the post-filter element 222, the first filter assembly 200 also includes an inner cylinder 280, and the inner cylinder 280 separates the pre-filter element 221 and the post-filter element 222. Considering that the post-filter element 222 is prevented from being squeezed and deformed by water pressure, the post-filter element 222 is arranged in the inner cylinder 280, so that the structure of the post-filter element 222 can be better protected.

[0068] 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.

[0069] 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 at the upper end of the post-filter element 222 or the post-filter element 222 is located at the upper end 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.

[0070] It should be further explained that when the upper end cover 250 slides upward or downward relative to the filter cover 210, the pre-filter 221 moves synchronously with the upper end cover 250. When the pre-filter 221 slides downward to the bottom of the activity space 290 due to gravity, the step portion abuts against the stopper 241, thereby preventing the pre-filter 221 from being squeezed and deformed or cracked due to compression. When the pre-filter 221 is subjected to buoyancy, it will drive the upper end cover 250 to slide upward, thereby separating the step portion 254 from the stopper 241.

[0071] In one embodiment, see Figure 5 and Figure 6 The filter element cover 210 is provided with a pre-filter element water inlet 211, a pre-filter element water outlet 212, and a post-filter element water outlet 213. The inner cylinder 280 is provided with a post-filter element 222 water inlet. The pre-filter element 221 is hollow. A first water passage 221a is formed in the middle of the pre-filter element 221. Water flowing in from the pre-filter element water inlet 211 is filtered by the pre-filter element 221 and flows out from the pre-filter element water outlet 212 through the first water passage 221a. The first filter assembly 200 also includes:

[0072] A water outlet pipe 230 is located in the first water passage 221a, one end of the water outlet pipe 230 is connected to the filter element cover 210, and one end of the water outlet pipe 230 is connected to the inner cylinder 280. Water flowing in from the water inlet of the rear filter element 222 is filtered by the rear filter element 222 and then flows out from the water outlet 213 of the rear filter element through the water outlet pipe 230.

[0073] Specifically, in this embodiment, a pre-filter water inlet 211 and a pre-filter water outlet 212 are provided on the filter cover 210. Of course, the pre-filter water inlet 211 and the pre-filter water outlet 212 can also be provided on the inner cylinder 280, and the pre-filter water inlet 211 and the pre-filter water outlet 212 can also be provided on the upper end cover 250. A water gap is formed between the central cylinder and the pre-filter 221, and the water gap is connected with the pre-filter water inlet 211. Water flows into the first filter assembly 200 from the pre-filter water inlet 211, flows through the water gap into the pre-filter 221 for filtration, and the filtered water after being filtered by the pre-filter 221 flows out from the pre-filter water outlet 212 through the first water passage 221a.

[0074] The filter cover 210 is also provided with a post filter outlet 213, and the inner cylinder 280 is provided with a post filter inlet 222 corresponding to the second filter chamber. Since the first filter assembly 200 is integrated, in order to simplify the external flow path, a water outlet pipe 230 is provided in the first water passage 221a. The water outlet pipe 230 is cylindrical, one end of the water outlet pipe 230 is connected to the filter cover 210 and communicated with the post filter outlet 213, and the other end of the water outlet pipe 230 is connected to the inner cylinder 280 and communicated with the filtered water after passing through the post filter 222. Water flows in from the water inlet of the post filter 222 and flows out from the post filter outlet 213 through the water outlet pipe 230 after being filtered by the post filter 222.

[0075] In one embodiment, see Figure 5 , Figure 7 and Fig.10 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, the first slot 214 is connected to the post-filter element water outlet 213, a first annular groove 214a is provided on the groove wall of the first slot 214, and the first sealing ring 510 is arranged in the first annular groove 214a.

[0076] According to the above embodiment, one end of the water outlet pipe 230 is further connected to the filter element cover 210. Further, 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 post-filter element water outlet 213. The diameter 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, and the water outlet pipe 230 is separated from the first water passage 221a by the first sealing ring 510.

[0077] 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.

[0078] In addition, the number of the first sealing rings 510 in this embodiment is two, but the present invention is not limited to this embodiment. The number of the first sealing rings 510 can be one, three, or more.

[0079] In one embodiment, see Figure 4 and Figure 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 facing the pre-filter element 221, the second slot 281a1 is opened on the protrusion 281a, the groove wall of the second slot 281a1 is provided with a second annular groove 281a2, and the second sealing ring 520 is arranged in the second annular groove 281a2.

[0080] According to the above embodiment, further, the inner cylinder 280 includes a partition plate 281. Considering that the thickness of the partition plate 281 is relatively thin, it is difficult to form a deeper slot for limiting the water 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 protrusion 281a 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 after being inserted. 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 first water passage 221a by the second sealing ring 520.

[0081] 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.

[0082] In addition, the number of the second sealing rings 520 in this embodiment is two, but the present invention is not limited to this embodiment. The number of the second sealing rings 520 can be one, three, or more.

[0083] In one embodiment, see Figure 5 and Fig. 9 The first filter assembly 200 also includes a second welding piece 242 , which is connected to the raised portion 281 a , and is located at the upper end of the raised portion 281 a , and extends toward the pre-filter element 221 .

[0084] It should be noted that the second welding piece 242 is connected to the protruding portion 281a, wherein the second welding piece 242 and the protruding portion 281a may be connected by welding, or by gluing, or by melting and forming the second welding piece 242 and the protruding portion 281a into one piece. In this embodiment, the second welding piece 242 and the protruding portion 281a are connected by welding, so that the connection between the protruding portion 281a and the second welding piece 242 is more secure. Considering that the second welding piece 242 and the protruding portion 281a are both set to plastic material, the second welding piece 242 and the protruding portion 281a are welded together by ultrasonic welding.

[0085] In addition, the second welding piece 242 is located at the upper end of the raised portion 281a, and the second welding piece 242 extends toward the pre-filter element 221. Considering that the pre-filter element 221 may be squeezed inwardly after being subjected to water pressure, causing the pre-filter element 221 to deform, the second welding piece 242 is arranged inside the pre-filter element 221 to prevent the pre-filter element 221 from being squeezed inwardly and deformed.

[0086] In one embodiment, see Figure 4 and Figure 5The 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.

[0087] 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.

[0088] 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 at the upper end of the post-filter element 222 .

[0089] 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.

[0090] 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.

[0091] In one embodiment, see Figure 4 and Figure 5The length of the post-filter element 222 is between 1 / 2 and 1 / 4 of the length of the pre-filter element 221 .

[0092] Specifically, after the primary filtered water is filtered by the pre-filter element 221 and then filtered by the reverse osmosis filter element 220, a portion of the water is discharged as waste water, and the other portion of the filtered water is filtered by the post-filter element 222. Therefore, the length of the post-filter element 222 is set at 1 / 2 to 1 / 4, which can correspond to the flow rate of the water flowing through the post-filter element 222.

[0093] 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 .

[0094] 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.

[0095] 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.

[0096] 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, the filter element cover is located at the upper end of the first filter assembly, and a connecting column connected to the filter element cover is provided at the lower side of the filter element cover; An upper end cover, the upper end cover is movably connected to the filter element cover, and the upper end cover can move up and down relative to the filter element cover; a through hole is provided in the middle of the upper end cover, the connecting column extends into the through hole, and the upper end cover is provided with a step portion toward the connecting column; A filter element, the filter element comprising a pre-filter element and a post-filter element, the upper end of the pre-filter element being connected to the filter element cover; The lower end of the inner cylinder and the inner cylinder are located inside the inner cylinder; A limiting member, wherein the limiting member is connected to the connecting column, the limiting member is arranged corresponding to the step portion, a movable space is provided between the limiting member and the step portion, the limiting member is located at the lower side of the step portion, and the limiting member is used to limit the step portion.

2. The composite filter element according to claim 1, characterized in that: The limiting member includes a welding portion and a receiving portion which are connected to each other, the welding portion is connected to the connecting column, and the receiving portion extends to the outside of the outer periphery of the connecting column.

3. The composite filter element according to claim 2, characterized in that: The receiving portions are provided in a plurality, and the plurality of receiving portions are arranged at intervals on the outer circumference of the welding portion.

4. The composite filter element according to claim 2, characterized in that: The welding portion is welded to the connecting column.

5. The composite filter element according to claim 1, characterized in that: The filter element cover is provided with a pre-filter element water inlet, a pre-filter element water outlet and a post-filter element water outlet, the inner cylinder is provided with a post-filter element water inlet, the pre-filter element is hollow, a first water passage is formed in the middle of the pre-filter element, water flowing in from the pre-filter element water inlet is filtered by the pre-filter element and then flows out from the first water outlet through the first water passage, the first filter assembly further comprises: A water outlet pipe, wherein the water outlet pipe is located in the first water passage, one end of the water outlet pipe is connected to the filter element cover, and one end of the water outlet pipe is connected to the inner cylinder. Water flowing in from the water inlet of the rear filter element is filtered by the rear filter element and then flows out from the water outlet of the rear filter element through the water outlet pipe.

6. The composite filter element according to claim 5, characterized in that: The filter element cover is provided with a first slot corresponding to the water outlet pipe, one end of the water outlet pipe is inserted into the first slot, the first slot is connected to the water outlet of the rear filter element, a first annular groove is provided on the groove wall of the first slot, and the first sealing ring is arranged in the first annular groove.

7. The composite filter element according to claim 5, characterized in that: The inner cylinder includes a connected partition plate and a cylinder body, 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, the second slot is opened on the protrusion, a second annular groove is opened on the groove wall of the second slot, and the second sealing ring is arranged in the second annular groove.

8. The composite filter element according to claim 7, characterized in that: The first filter assembly also includes a second welding piece, the second welding piece is connected to the protrusion, the second welding piece is located at the upper end of the protrusion, and the second welding piece extends toward the pre-filter element.

9. The composite filter element according to claim 7, 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 length of the front filter element is greater than that of the rear filter element, and the front filter element is located at the upper end of the rear filter element.

12. The composite filter element according to claim 11, characterized in that: The length of the post-filter element is between 1 / 2 and 1 / 4 of the length of the pre-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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