Composite filter cartridges and water purifiers

Abstract

This invention discloses a composite filter element and a water purifier. The composite filter element includes a first filtration assembly, which comprises a filter element cover, an upper cover, a filter element, and a limiting member. The upper cover is movably connected to the filter element cover and can move up and down relative to it. The upper cover is fixedly connected to the filter element. The limiting member is provided corresponding to the stepped portion, and there is a space for movement between the limiting member and the stepped portion. The limiting member is located on the lower side of the stepped portion and is used to limit the stepped portion. This invention achieves this by movably connecting the upper cover to the filter element cover and fixing the upper cover to the filter element, allowing the upper cover and the filter element to move relative to the filter element cover. Furthermore, a limiting member is provided to limit the stepped portion on the filter element cover. The space for movement between the stepped portion and the limiting member allows the lower part of the filter element to slide downwards as a whole when subjected to tension, preventing deformation or tearing due to excessive tension.

Description

Technical Field

[0001] This invention relates to the field of water purification technology, and in particular to a composite filter element and a water purifier. Background Technology

[0002] As people pursue a higher quality of life, the quality of drinking water has become a major concern. Reverse osmosis water purifiers are becoming increasingly popular because they produce fresher, more hygienic, and safer purified water.

[0003] In existing water purifiers, the filter cartridge is usually fixed to its filter cartridge cover. When the water purifier starts working, the filter cartridge will gradually fill with water. Because the lower part of the filter cartridge contains a lot of water, it will exert a large pulling force on the upper part of the filter cartridge. The filter cartridge may be deformed or torn due to the pulling force. Summary of the Invention

[0004] The main objective of this invention is to propose a composite filter element that prevents the filter element from deforming or tearing due to tensile stress after being filled with water.

[0005] To achieve the above objectives, the present invention proposes a composite filter element comprising a first filter assembly, the first filter assembly comprising:

[0006] A filter element cover, which is located at the upper end of the first filter assembly, and a connecting post connected to the lower side of the filter element cover;

[0007] The upper end cover is movably connected to the filter element cover and can move up and down relative to the filter element cover; a through hole is opened in the middle of the upper end cover, the connecting post extends into the through hole, and a stepped part is provided on the upper end cover facing the connecting post;

[0008] The filter element includes a pre-filter and a post-filter, the pre-filter is located above the post-filter, and the upper end of the pre-filter is connected to the filter element cover.

[0009] The inner cylinder has the lower end of the pre-filter connected to it, and the post-filter located inside the inner cylinder.

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

[0011] In one embodiment, the limiting member includes a welded portion and a receiving portion connected together, the welded portion being connected to the connecting post, and the receiving portion extending to the outer side of the outer periphery of the connecting post.

[0012] In one embodiment, the number of receiving portions is set to multiple, and the multiple receiving portions are spaced apart on the outer periphery of the welded portion.

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

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

[0015] The water outlet pipe is located inside the first water passage. One end of the water outlet pipe is connected to the filter cover, and the other end is connected to the inner cylinder. Water flowing in from the inlet of the post-filter element is filtered by the post-filter element and then flows out from the outlet of the post-filter element through the water outlet pipe.

[0016] In one embodiment, the filter cover has 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 formed on the groove wall of the first slot, and the first sealing ring is disposed in the first annular groove.

[0017] In one embodiment, the inner cylinder includes a partition plate and a cylinder body connected together. The partition plate is used to separate the pre-filter and the post-filter. The partition plate has a protrusion facing the pre-filter. The second slot is formed in the protrusion. The groove wall of the second slot has a second annular groove. The second sealing ring is disposed in the second annular groove.

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

[0019] In one embodiment, the inner cylinder has an opening on the side away from the pre-filter element, and the first filter assembly further includes 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 is between 1 / 2 and 1 / 4 of the length of the pre-filter.

[0021] In one embodiment, the upper end cover has a connecting portion connected to the filter element cover, and a third annular groove is formed on the outer periphery of the connecting portion. 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 is greater than the length of the post-filter, and the pre-filter is located above the post-filter.

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

[0024] This invention also proposes a water purifier, which includes a composite filter element. The composite filter element includes a first filtration assembly, which includes a filter element cover, an upper cover, a filter element, an inner cylinder, and a limiting member. The filter element cover is located at the upper end of the first filtration assembly, and a connecting post is provided on the lower side of the filter element cover and connected thereto. The upper cover is movably connected to the filter element cover and can move up and down relative to the filter element cover. A through hole is opened in the middle of the upper cover, and the connecting post extends into the through hole. A stepped portion is provided on the upper cover facing the filter element cover. The filter element includes a pre-filter and a post-filter. The length of the pre-filter is greater than the length of the post-filter. The pre-filter is located above the post-filter. One end of the pre-filter is connected to the filter cover. The other end of the pre-filter is connected to the inner cylinder. The post-filter is located inside the inner cylinder. The limiting member is connected to the connecting post. The limiting member is provided corresponding to the step portion. There is a movable space between the limiting member and the step portion. The limiting member is located on the lower side of the step portion and is used to limit the step portion.

[0025] The technical solution of this invention adopts a method of movably connecting the upper end cover and the filter element cover, and fixing the upper end cover and 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 to limit the step part on the filter element cover. An active space is provided between the step part and the limiting member, so that the lower part of the filter element can slide downward as a whole when subjected to tension, avoiding deformation or tearing due to excessive tension. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

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

[0028] Figure 2 This is a schematic diagram of the composite filter element from a cross-sectional view.

[0029] Figure 3 This is a schematic diagram of the structure of the first filter component;

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

[0031] Figure 5 This is a schematic diagram of the structure of the first filter component from a cross-sectional view.

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

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

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

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

[0036] Figure 10 for Figure 5 A schematic diagram of the internal structure after removing the water outlet pipe, the first sealing ring, the second sealing ring, the limiting component, and the second welding piece;

[0037] Figure 11 This is a structural schematic diagram of the limiting component;

[0038] Figure 12 This is an exploded view of the second filter component;

[0039] Figure 13 This is an exploded view of the filter cap assembly;

[0040] Figure 14 This is a structural diagram of the filter cartridge cover and filter cartridge handle (where the filter cartridge cover and filter cartridge handle are separate).

[0041] Explanation of icon numbers:

[0042]

[0043]

[0044] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0045] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort 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 indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0047] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, if the word "and / or" appears throughout the text, it means including three parallel solutions; for example, "A and / or B" includes solution A, solution B, or a solution that simultaneously satisfies A and B. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0048] This invention proposes a composite filter element 10 for installation in a water purifier to filter the raw water (i.e., tap water) that passes through it, so that the water quality meets the user's needs before it is used by the user.

[0049] Please see Figure 1 , Figure 2 , Figure 10 and Figure 11The composite filter element 10 proposed in this invention includes a filter bottle 100, a first filter component 200, a second filter component 300, and a filter cap assembly 400. The filter bottle 100 has an internal receiving cavity 110. The first filter component 200 and the second filter component 300 are disposed within the receiving cavity 110, with the first filter component 200 located inside the second filter component 300, or vice versa. It should be noted that the first filter component 200 and the second filter component 300 are respectively disposed in two independent chambers within the filter bottle 100. The filter bottle 100 is barrel-shaped with an open top, which is covered by the filter cap assembly 400. The filter cap assembly 400 has at least one inlet and at least one outlet, both of which communicate with the receiving cavity 110.

[0050] Specifically, the filter bottle 100 is used to install in a water purification device, and the second filter component 300 and the first filter component 200 are both disposed in the receiving cavity 110 of the filter bottle 100; the first filter component 200 filters out impurities contained in the water and / or improves the taste of the water, and the second filter component 300 filters out solutes such as salt ions in the water, thereby reducing the concentration of solutes such as salt ions in the water and reducing the TDS value of the raw water.

[0051] The second filtration 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 fitted onto the outer wall of the central tube 340 and is disposed between the reverse osmosis top cover 320 and the reverse osmosis bottom cover 330. The upper and lower ends 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 reverse osmosis filter element grooves for the ends of the reverse osmosis filter element 310 to be embedded. Thus, the reverse osmosis top cover 320 and the reverse osmosis bottom cover 330 together fix the reverse osmosis filter element 310 inside the filter bottle 100.

[0052] The filter cap assembly 400 includes a filter bottle cap 410, a filter bottle handle 420, and a decorative cover 430. The filter bottle handle 420 is rotatably connected to the filter bottle cap 410, and the decorative cover 430 covers the filter bottle cap 410.

[0053] In embodiments of the present invention, such as Figures 3 to 9As shown, the composite filter element 10 includes a first filter assembly 200, which includes a filter element cover 210, an upper end cover 250, a filter element 220, and a limiting member 241. 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 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. The upper end cover 250 has a through hole 255 in the middle, and the connecting post 215 extends into the through hole 255. The upper end cover 250 has a stepped portion 254 facing the filter element cover 210. The limiting member 241 is connected to the connecting post 215 and is provided corresponding to the stepped portion 254. There is an active space 290 between the limiting member 241 and the stepped portion 254. The limiting member 241 is located on the lower side of the stepped portion 254 and is used to limit the stepped portion 254.

[0054] Specifically, the composite filter element 10 includes a first filter assembly 200, which is integrally integrated into the filter bottle 100. Correspondingly, the first filter assembly 200 is also integrally integrated. The first filter assembly 200 includes a pre-filter element 221 and a post-filter element 222. In this embodiment, the filter element 220 may include only the pre-filter element 221, only the post-filter element 222, or both; no specific limitation is made here.

[0055] It should be noted that the first filter assembly 200 includes a filter element cover 210. Considering that the pre-filter element 221 has a short lifespan and 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 can be lifted out of the cylinder 282 using the filter element handle 270, making the first filter assembly 200 easy to replace. Considering that the lifespan of the reverse osmosis filter element 220 is much longer than that of the pre-filter element 221, to avoid replacing the reverse osmosis filter element 220 before it reaches its lifespan, only the first filter assembly 200 can be replaced during replacement, without replacing the second filter assembly 300. This reduces replacement costs and allows the reverse osmosis filter element 220 in the second filter assembly 300 to be fully utilized.

[0056] Furthermore, the upper cover 250 is connected to the filter element cover 210. In this embodiment, the upper cover 250 and the filter element cover 210 are sealed together. Of course, the upper cover 250 and the filter element cover 210 can be glued or welded, which is not specifically limited here. The upper cover 250 is connected to the filter element 220 to fix the filter element 220. The upper 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 as water is continuously injected from the inlet, the amount of water inside the filter element 220 will increase, and the pulling force from the lower part of the filter element 220 to the upper part of the filter element 220 will increase. Considering that the upper cover 250 is movably connected to the filter element cover 210 and the upper cover 250 is fixedly connected to the filter element 220, the filter element 220 will drive the upper cover 250 to move downward. In order to prevent the upper 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 cover 250. The limiting member 241 is located below the step portion 254, so that when the step portion 254 descends to a certain extent, the step portion 254 will abut against the limiting member 241.

[0058] When the chamber containing filter element 220 is completely filled with water, filter element 220, being lightweight, will float upwards. At this time, the stepped portion 254 separates from the limiting member 241, and filter element 220 causes the upper end cover 250 to move upwards relative to filter element cover 210. Therefore, the upper end cover 250 and filter element 220 can move within this movable space 290.

[0059] The technical solution of the present invention adopts a method of movably connecting the upper end cover 250 and the filter element cover 210, and fixing the upper end cover 250 and 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 to limit the step portion 254 on the filter element cover 210. An active space 290 is provided between the step portion 254 and the limiting member 241, so that the lower part of the filter element 220 can slide downward as a whole when subjected to tension, avoiding deformation or tearing due to excessive tension.

[0060] In one embodiment, please refer to Figure 7 and Figure 11 The limiting member 241 includes a welded part 241a and a receiving part 241b connected to each other. The welded part 241a is connected to the connecting post 215, and the receiving part 241b extends to the outer side of the outer periphery of the connecting post 215.

[0061] Specifically, the limiting member 241 further includes a welded portion 241a and a receiving portion 241b connected together. In this embodiment, the welded portion 241a and the receiving portion 241b are integrally formed. Of course, this embodiment is not limited to the present embodiment; the welded portion 241a and the receiving portion 241b can be welded together or glued together. The welded portion 241a is at least connected to the end face of the bottom end of the connecting post 215. The connection method between the welded portion 241a and the connecting post 215 can be welding, gluing, or integrally formed in a molten state, which is not specifically limited here. Considering that the receiving portion 241b is used to limit the stepped portion 254, the receiving portion 241b extends at least to the outer side of the outer periphery of the connecting post 215. This arrangement of the receiving portion 241b can limit the stepped portion 254.

[0062] In one embodiment, please refer to Figure 4 , Figure 5 and Figure 11 The number of receiving parts 241b is set to multiple, and the multiple receiving parts 241b are spaced apart on the outer periphery of the welding part 241a.

[0063] As described in the above embodiment, the receiving part 241b extends to the outer side of the connecting post 215. In order to enhance the limiting effect of the receiving part 241b, the receiving part 241b is made as close as possible to the filter cover 210, and the distance between the receiving part 241b and the filter cover 210 is small. Considering that a water channel of the filter 220 is formed between the connecting post 215 and the filter cover 210, if the distance between the receiving part 241b and the filter cover 210 is small, it will block the water channel, resulting in poor water flow or blockage of the water channel. Therefore, the number of receiving parts 241b is set to multiple, and the multiple receiving parts 241b are spaced apart, so that the gap between the receiving parts 241b can be used to maintain the smooth flow of water. In this embodiment, the number of receiving parts 241b is set to three. However, it is not limited to this embodiment. The number of receiving parts 241b can also be set to two, four, or more, as long as the receiving parts 241b do not affect the flow of water.

[0064] In one embodiment, please refer to Figure 5 The welding part 241a is welded to the connecting column 215.

[0065] In the above embodiments, there are various ways to connect the welding part 241a and the connecting post 215. In this embodiment, the welding part 241a and the connecting post 215 are fixed by welding. This fixing method has good sealing performance and, compared with adhesive bonding, will not affect its connection strength due to water erosion. Therefore, welding is chosen for fixing. It should be noted that both the limiting member 241 and the filter element cover 210 are made of plastic. Therefore, the specific welding method here is ultrasonic welding, that is, the welding part 241a and the filter element cover 210 are welded together using an ultrasonic instrument.

[0066] In one embodiment, please refer to 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. The post-filter element 222 is located inside the inner cylinder 280.

[0067] In this embodiment, 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 by adhesive bonding. To separate the pre-filter element 221 and the post-filter element 222, the first filter assembly 200 also includes an inner cylinder 280, which separates the pre-filter element 221 and the post-filter element 222. Considering that the post-filter element 222 should not be deformed due to water pressure, it is placed inside the inner cylinder 280, which better protects the structure of the post-filter element 222.

[0068] The inner cylinder 280 divides the central tube 340 into two non-communicating filter chambers: a first filter chamber and a second filter chamber. In this embodiment, the first filter chamber is enclosed by the filter element cover 210, the upper end cover 250, the central tube 340, and the inner cylinder 280, while the second filter chamber is enclosed by the inner cylinder 280 and the central 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 221 is generally the first step in the water purification process of a water purifier, used to filter out larger particles or lint in the water. The post-filter 222 is generally the final step in the water purification process, used to adjust the taste of the purified water. The pre-filter 221 and post-filter 222 can be arranged in a cylindrical shape. When arranged cylindrically, the pre-filter 221 and post-filter 222 can be arranged vertically, i.e., the pre-filter 221 is located above the post-filter 222, or the post-filter 222 is located above the pre-filter 221; alternatively, they can be arranged internally and externally, i.e., the pre-filter 221 is located inside the post-filter 222, or the post-filter 222 is located inside the pre-filter 221.

[0070] It should be further explained that when the upper cover 250 slides upward or downward relative to the filter cover 210, the pre-filter 221 moves synchronously with the upper cover 250. When the pre-filter 221 slides downward to the bottom of the movable space 290 due to gravity, the stepped portion abuts against the limiting member 241, thus 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 cause the upper cover 250 to slide upward, thereby separating the stepped portion 254 from the limiting member 241.

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

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

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

[0074] The filter element 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 filtration chamber. Since this first filtration assembly 200 is integrated, 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, with one end connected to the filter element cover 210 and communicating with the post-filter outlet 213, and the other end connected to the inner cylinder 280 and communicating with the filtered water flowing through the post-filter 222. Water flows in from the post-filter inlet 222, is filtered by the post-filter 222, and then flows out from the post-filter outlet 213 through the water outlet pipe 230.

[0075] In one embodiment, please refer to Figure 5 , Figure 7 and Figure 10 The filter cover 210 has 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 water outlet 213 of the rear filter element. A first annular groove 214a is formed on the groove wall of the first slot 214. The first sealing ring 510 is disposed in the first annular groove 214a.

[0076] As described in the previous embodiment, one end of the water outlet pipe 230 is further connected to the filter element cover 210. Furthermore, the filter element cover 210 has 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 rear filter element outlet 213. The diameter of the first slot 214 is substantially the same as the outer diameter of the water outlet pipe 230, allowing the first slot 214 to effectively 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, thereby separating the water outlet pipe 230 from the first water passage 221a.

[0077] Considering the thickness of the first sealing ring 510, and to ensure good sealing of the water outlet pipe 230, the distance between the water outlet pipe 230 and the wall of the first slot 214 is very short. Therefore, directly placing the first sealing ring 510 between the water outlet pipe 230 and the first slot 214 is challenging. In this embodiment, a first annular groove 214a is formed on the wall of the first slot 214, and the first sealing ring 510 is placed within the first annular groove 214a. In this embodiment, part of the first sealing ring 510 is located within the first annular groove 214a, and the other part extends out of the first annular groove 214a and abuts against the water outlet pipe 230. This arrangement effectively seals the outer periphery of the water outlet pipe 230.

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

[0079] In one embodiment, please refer to 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 221 and the post-filter 222. The partition plate 281 is provided with a protrusion 281a facing the pre-filter 221. The second slot 281a1 is opened in the protrusion 281a. The second annular groove 281a2 is opened on the groove wall of the second slot 281a1. The second sealing ring 520 is disposed in the second annular groove 281a2.

[0080] As described in the above embodiments, the inner cylinder 280 further includes a partition plate 281. Considering that the partition plate 281 is relatively thin, it is difficult to form a deep slot for limiting the water outlet pipe 230. Therefore, the partition plate 281 is provided with a protrusion 281a facing the pre-filter element 221. The protrusion 281a has a second slot 281a1 corresponding to the water outlet pipe 230. The diameter of the second slot 281a1 is basically the same as the outer diameter of the water outlet pipe 230, so that the water outlet pipe 230 is well limited after the second slot 281a1 is 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 the thickness of the second sealing ring 520, and 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 short. Therefore, directly placing the second sealing ring 520 between the water outlet pipe 230 and the second slot 281a1 is challenging. In this embodiment, a second annular groove 281a2 is formed on the groove wall of the second slot 281a1, and the second sealing ring 520 is placed within the second annular groove 281a2. In this embodiment, part of the second sealing ring 520 is located within 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. This arrangement effectively seals the outer periphery of the water outlet pipe 230.

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

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

[0084] It should be noted that the second welding piece 242 connects to the protrusion 281a. The connection between the second welding piece 242 and the protrusion 281a can be welding, adhesive bonding, or fusion molding. In this embodiment, welding is used to connect the second welding piece 242 and the protrusion 281a, making the connection between them more robust. Considering that both the second welding piece 242 and the protrusion 281a are made of plastic, they are welded together using ultrasonic welding.

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

[0086] In one embodiment, please refer to Figure 4 and Figure 5The inner cylinder 280 has an opening 282b on the side away from the pre-filter 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 rear filter 222 is connected to the partition plate 281, and the lower end cover 260 is used to receive the other end of the rear filter 222.

[0087] Specifically, an opening 282b is provided on the side of the inner cylinder 280 away from the pre-filter element 221. The opening 282b is used to insert the post-filter element 222 into the inner cylinder 280. After the post-filter element 222 is inserted into the inner cylinder 280, the lower end cap 260 is inserted into the inner cylinder 280 through the opening 282b. The lower end cap 260 is interference-fitted with the inner wall of the inner cylinder 280. One end of the post-filter element 222 is connected to the partition plate 281 by adhesive bonding. The lower end cap 260 is used to receive the other end of the post-filter element 222. The lower end cap 260 may or may not be connected to the post-filter element 222.

[0088] In one embodiment, please refer to Figure 4 and Figure 5 The length of the pre-filter 221 is greater than the length of the post-filter 222, and the pre-filter 221 is located at the upper end of the post-filter 222.

[0089] In the above embodiments, an optional embodiment may have the pre-filter 221 and post-filter 222 arranged inside and outside each other. Considering that the pre-filter 221 is used to filter larger particles or lint, while the post-filter 222 is only used to adjust the taste, setting the length of the pre-filter 221 to be greater than the length of the post-filter 222 would waste a lot of space. In this embodiment, the pre-filter 221 and post-filter 222 are arranged vertically, specifically, the pre-filter 221 is placed above the post-filter 222.

[0090] In the above embodiments, an optional embodiment may have the pre-filter 221 and post-filter 222 arranged inside and outside each other. Considering that the pre-filter 221 is used to filter larger particles or lint, while the post-filter 222 is only used to adjust the taste, setting the length of the pre-filter 221 to be greater than the length of the post-filter 222 would waste a lot of space. In this embodiment, the pre-filter 221 and post-filter 222 are arranged vertically, specifically, the pre-filter 221 is placed above the post-filter 222.

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

[0092] Specifically, after the initial filtered water is filtered by the pre-filter 221, it is then filtered by the reverse osmosis filter 220. Part of the water is discharged as wastewater, and the other part of the filtered water is filtered by the post-filter 222. Therefore, the length of the post-filter 222 is set to 1 / 2 to 1 / 4, which corresponds to the flow rate of the water flowing through the post-filter 222.

[0093] In one embodiment, please refer to Figure 4 and Figure 5 The upper end cover 250 has a connecting part 253 connected to the filter element cover 210. A third annular groove 253a is provided on the outer periphery of the connecting part 253. A third sealing ring 530 is provided between the third annular groove 253a and the filter element cover 210.

[0094] According to the above embodiment, the upper cover 250 and the filter element cover 210 are sealed together. The upper cover 250 has a connecting portion 253 that mates with the filter element cover 210. Specifically, the sealing connection is achieved by providing a third sealing ring 530 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 short, and the third sealing ring 530 has a certain thickness, it is difficult to directly provide the third sealing ring 530 between the filter element cover 210 and the connecting portion 253. Therefore, a third annular groove 253a is formed on the outer periphery of the connecting portion 253, and the third sealing ring 530 is provided between the third annular groove 253a and the filter element cover 210. In this embodiment, the third sealing ring 530 is partially located in the third annular groove 253a, and the other part extends out of the groove opening of the third annular groove 253a and abuts against the inner wall of the filter element cover 210. This can provide a better seal, so that the water passage between the filter element cover 210 and the upper cover 250 does not leak.

[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 is as described in the above embodiments. Since the present water purifier adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0096] The above description is merely an optional embodiment of the present invention and does not limit the patent scope of the present invention. All equivalent structural transformations made using the contents of the present invention's specification and drawings under the inventive concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A composite filter cartridge, characterized by, Includes a first filtering component, the first filtering component comprising: A filter element cover is located at the upper end of the first filter assembly, and a connecting post is provided on the lower side of the filter element cover. The upper end cover is movably connected to the filter element cover and can move up and down relative to the filter element cover; a through hole is opened in the middle of the upper end cover, the connecting post extends into the through hole, and a stepped part is provided on the upper end cover facing the connecting post; The filter element includes a pre-filter and a post-filter, with the upper end of the pre-filter connected to the filter element cover. The lower end of the inner cylinder is located inside the inner cylinder; A limiting member is connected to the connecting column. The limiting member is provided corresponding to the step portion. There is an active space between the limiting member and the step portion. The limiting member is located on the lower side of the step portion and is used to limit the step portion. The limiting member includes a welded part and a receiving part connected to each other. The welded part is connected to the connecting column, and the receiving part extends to the outer side of the outer periphery of the connecting column. The number of receiving parts is set to multiple, and the multiple receiving parts are spaced apart on the outer periphery of the welded part.

2. The composite filter element of claim 1 wherein, The welded part is welded to the connecting column.

3. The composite filter element as described in claim 1, characterized in that, The filter element cover has a pre-filter inlet, a pre-filter outlet, and a post-filter outlet. The inner cylinder has a post-filter inlet. The pre-filter is hollow and has a first water passage formed in its center. Water flowing in from the pre-filter inlet is filtered by the pre-filter and then flows out through the first water passage from the first outlet. The first filtration assembly also includes: The water outlet pipe is located inside the first water passage. One end of the water outlet pipe is connected to the filter cover, and the other end is connected to the inner cylinder. Water flowing in from the inlet of the post-filter element is filtered by the post-filter element and then flows out from the outlet of the post-filter element through the water outlet pipe.

4. The composite filter element as described in claim 3, characterized in that, The filter cover has 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 formed on the groove wall of the first slot, and a first sealing ring is disposed in the first annular groove.

5. The composite filter element as described in claim 3, characterized in that, 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 and the post-filter. The partition plate has a protrusion facing the pre-filter. A second slot is opened in the protrusion. A second annular groove is opened on the groove wall of the second slot. A second sealing ring is disposed in the second annular groove.

6. The composite filter element as described in claim 5, characterized in that, The first filter assembly further includes a second welding piece, which is connected to the protrusion and is located at the upper end of the protrusion, extending toward the pre-filter element.

7. The composite filter element as described in claim 5, characterized in that, The inner cylinder has an opening on the side away from the pre-filter element. The first filter assembly also includes a lower end cover, which is 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.

8. The composite filter element as described in claim 1, characterized in that, The upper end cover has a connecting part that is connected to the filter element cover. A third annular groove is provided on the outer periphery of the connecting part, and a third sealing ring is provided between the third annular groove and the filter element cover.

9. The composite filter element as described in claim 1, characterized in that, The length of the pre-filter is greater than the length of the post-filter, and the pre-filter is located above the post-filter.

10. The composite filter element as described in claim 9, characterized in that, The length of the post-filter is between 1 / 2 and 1 / 4 of the length of the pre-filter.

11. A water purifier, characterized in that, Includes the composite filter element as described in any one of claims 1 to 10.

Images