Filter cover assemblies, composite filter cartridges, and equipment with water purification functions

Abstract

This invention discloses a filter cap assembly, a composite filter element, and a device with water purification function. The filter cap assembly includes a filter bottle, a filter bottle cap, and a filter element cap. The filter bottle cap is mounted on the upper side of the filter element cap. An installation groove is formed on the upper side of the filter bottle cap, and an installation opening is formed at the bottom of the installation groove. The installation opening is circular, and the installation groove has a bottom located outside the installation opening. The bottom of the groove is a continuous plane in the circumferential direction. The filter element cap is detachably installed in the installation opening, and is confined within the installation groove and conforms to the bottom of the groove. This invention's technical solution, by employing a continuous, plane-shaped bottom along the outer edge of the installation opening, ensures that the sealing ring fitted around the outer circumference of the filter element cap is simultaneously stressed in the circumferential direction during installation, thereby ensuring the filter element cap is properly installed, and consequently, the filter element module connected to the filter element cap is also properly installed.

Description

Technical Field

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

[0002] Existing composite filter cartridges can integrate pre-filter cartridges, post-filter cartridges, and reverse osmosis filter cartridges into a single filter bottle, thereby reducing the space occupied by the composite filter cartridge.

[0003] Considering that the lifespan of pre- and post-filters is shorter than that of reverse osmosis filters, the pre- and post-filters are designed to be detachable from the reverse osmosis filters. This allows for individual replacement of the pre- and post-filters, reducing replacement costs. When assembling the pre- and post-filter components with the reverse osmosis filter assembly, a sealing ring is often required between them to prevent water mixing and contamination of the filtered water.

[0004] Currently, such as Figure 1 As shown in the background technology, the sealing ring 500a' is fitted onto the pre- and post-filter components, and then the pre- and post-filter components are installed inside the reverse osmosis filter component. When the sealing ring 500a' is installed into the filter bottle cover 410' on the upper side of the filter bottle, the surface that the sealing ring 500a' first contacts is not a complete ring surface, but rather the side surface of the stage 418'. As a result, only part of the outer periphery of the sealing ring 500a' is subjected to force. Thus, the sealing ring is subjected to uneven force during the installation process, causing the center of gravity of the sealing ring 500a' to shift. Consequently, the height of the sealing ring 500a' in the circumferential direction is different after installation, resulting in the pre- and post-filter components not being fully installed. Summary of the Invention

[0005] The main objective of this invention is to provide a filter cap assembly that ensures the sealing ring is subjected to uniform force when installed into the filter bottle cap.

[0006] To achieve the above objectives, the filter cap assembly proposed in this invention includes:

[0007] A filter bottle cap is provided for covering a filter bottle. The upper side of the filter bottle cap has an installation groove, and the bottom of the installation groove has an installation opening. The installation groove has a groove bottom located outside the installation opening.

[0008] A filter element cover, wherein the filter element cover is positioned within the mounting groove and is fitted to the bottom of the groove;

[0009] A sealing ring is fitted onto the filter element cover, and the filter element cover is detachably connected to the mounting port via the sealing ring.

[0010] The bottom of the groove is provided with a platform, and there is a distance D between the platform and the mounting opening, wherein the range of D is D≥0.1mm.

[0011] In one embodiment, the mounting port is circular.

[0012] In one embodiment, the bottom of the trough is planar.

[0013] In one embodiment, the bottom of the groove includes an annular surface, a first bearing surface, and a second bearing surface. The annular surface connects the first bearing surface and the second bearing surface, and the annular surface is closer to the mounting opening than the first bearing surface and the second bearing surface.

[0014] In one embodiment, the filter cover includes a main body and a connecting part connected to each other. The main body is located above the mounting port, the bottom of the groove supports the bottom surface of the main body, and the connecting part extends into the mounting port.

[0015] In one embodiment, the main body portion protrudes from the outer periphery of the connecting portion and is provided with a mounting plate and two lugs, the first bearing surface bearing the mounting plate and the two second bearing surfaces bearing the two lugs.

[0016] In one embodiment, the filter bottle cap is provided with two limiting platforms, which extend toward the interior of the receiving groove and limit the locking platform.

[0017] In one embodiment, the stage has two notches extending to the bottom of the notch, with the notches facing the filter cover, and the two lugs respectively confined within the two notches.

[0018] In one embodiment, the periphery of the mounting port is chamfered.

[0019] The present invention also proposes a composite filter element, the composite filter element comprising a filter cover assembly, the filter cover assembly comprising a filter bottle cover and a filter element cover, the filter bottle cover being used to cover the filter bottle, the filter bottle cover having an installation opening in the middle, and the outer edge of the installation opening having a groove bottom; the filter element cover being detachably installed in the installation opening, the filter element cover at least partially extending into the installation opening; the groove bottom being a continuously arranged plane in the circumferential direction of the installation opening.

[0020] This invention also proposes a device with a water purification function, comprising a composite filter element, the composite filter element including a filter bottle cap, a filter element cap, and a sealing ring. The filter bottle cap is used to cover the filter bottle, and an installation groove is formed on the upper side of the filter bottle cap. An installation opening is formed at the bottom of the installation groove, and the installation groove has a groove bottom located outside the installation opening. The filter element cap is limited within the installation groove and fits against the groove bottom. The sealing ring is sleeved on the filter element cap, and the filter element cap is detachably connected to the installation opening through the sealing ring. The groove bottom is a continuously formed plane in the circumferential direction of the installation opening.

[0021] The technical solution of this invention employs a continuous, flat groove bottom along the outer edge of the installation port, which allows the sealing ring fitted around the outer periphery of the filter element cover to be simultaneously stressed in the circumferential direction during installation, thereby enabling the filter element cover to be installed in place, and thus enabling the filter element module connected to the filter element cover to be installed in place. Attached Figure Description

[0022] 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.

[0023] Figure 1 This is a schematic diagram illustrating the structure of the filter bottle cap, sealing ring, and adapter top cover in the background technology.

[0024] Figure 2 This is a schematic diagram of the structure of the filter bottle cap, sealing ring, and adapter top cover of the present invention.

[0025] Figure 3 This is a schematic diagram of the composite filter element of the present invention;

[0026] Figure 4 This is a schematic diagram of the composite filter element from a cross-sectional view.

[0027] Figure 5 for Figure 4 A schematic diagram of the structure after removing the pre-filter, post-filter, and reverse osmosis filter.

[0028] Figure 6 This is an exploded view of the composite filter element;

[0029] Figure 7 This is an exploded view of the filter cap assembly;

[0030] Figure 8 A schematic diagram showing the fit between the filter element cover and the filter element handle;

[0031] Figure 9 This is a schematic diagram of the filter bottle cap.

[0032] Figure 10 This is a schematic diagram of the pre- and post-filter components from a cross-sectional view.

[0033] Figure 11 This is an exploded view of the pre- and post-filter components;

[0034] Figure 12 This is an exploded view of the reverse osmosis filter assembly.

[0035] Explanation of icon numbers:

[0036]

[0037]

[0038] 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

[0039] 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.

[0040] 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.

[0041] 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.

[0042] Existing composite filter cartridges can integrate pre-filter cartridges, post-filter cartridges, and reverse osmosis filter cartridges into a single filter bottle, thereby reducing the space occupied by the composite filter cartridge.

[0043] Considering that the lifespan of pre- and post-filters is shorter than that of reverse osmosis filters, the pre- and post-filters are designed to be detachable from the reverse osmosis filters. This allows for individual replacement of the pre- and post-filters, reducing replacement costs. When assembling the pre- and post-filter assemblies (including pre- and post-filters) with the reverse osmosis filtration assembly, a sealing ring is often required between the two filtration components to prevent water mixing and contamination of the filtered pure water.

[0044] Currently, such as Figure 1 As shown in the background technology, the sealing ring 500a' is fitted onto the pre- and post-filter components, and then the pre- and post-filter components are installed inside the reverse osmosis filter component. When the sealing ring 500a' is installed into the filter bottle cover 410' on the upper side of the filter bottle, the surface that the sealing ring 500a' first contacts is not a complete annular surface, but rather the side of the stage 418'. As a result, only part of the outer periphery of the sealing ring 500a' is subjected to force. Thus, the sealing ring is subjected to uneven force during the installation process, causing the center of gravity of the sealing ring 500a' to shift. Consequently, the height of the sealing ring 500a' in the circumferential direction is different after installation, resulting in the pre- and post-filter components not being able to be installed completely (not being able to be installed in the pre-set installation position).

[0045] In view of this, the present invention proposes a composite filter element 10 for installation in a device with a water purification function to filter the raw water passing through it, so that the water quality meets the user's needs and is then used by the user.

[0046] Please see Figures 3 to 5The composite filter element 10 proposed in this invention includes a filter bottle 100, pre- and post-filter components 200, a reverse osmosis filter component 300, and a filter cap assembly 400. The filter bottle 100 has an internal receiving cavity 110, within which the pre- and post-filter components 200 and the reverse osmosis filter component 300 are disposed. The pre- and post-filter components 200 are located inside the reverse osmosis filter component 300. It should be noted that the pre- and post-filter components 200 and the reverse osmosis filter component 300 are respectively disposed in two independent chambers within the filter bottle 100. The pre- and post-filter components 200 include a pre-filter component and a post-filter component, which are integrated into a single pre- and post-filter component 200. The filter bottle 100 is barrel-shaped with an open top, which is covered by the filter cap assembly 400. The filter cover assembly 400 is provided with at least one water inlet and at least one water outlet, both of which are connected to the receiving cavity 110.

[0047] The feature of this composite filter element 10 is that it integrates the pre-filter element 210, the post-filter element 220 and the reverse osmosis filter element 310 into the same filter bottle 100, thus realizing an integrated composite filter element 10.

[0048] Specifically, the filter bottle 100 is used to install in a device with water purification function, and the reverse osmosis filter assembly 300 and the pre- and post-filter assemblies 200 are both disposed in the receiving cavity 110 of the filter bottle 100. The pre- and post-filter assemblies 200 filter out impurities contained in the water and / or improve the taste of the water, while the reverse osmosis filter assembly 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. The device with water purification function can be any one of a water purifier, a water dispenser, a water softener / purifier combo, a water purifier / heater combo, and an ice maker.

[0049] Please continue reading. Figure 12 The reverse osmosis 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 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.

[0050] like Figures 2 to 9As shown, the filter cover assembly 400 includes a filter bottle cover 410, a filter bottle handle 420, a filter cartridge cover 430, a filter cartridge handle 440, and a decorative cover 460. The filter bottle handle 420 is rotatably connected to the filter bottle cover 410, and the decorative cover 460 covers the filter bottle cover 410.

[0051] It should be noted that the decorative cover 460 is used to cover the filter element cover 430 and the filter bottle cover 410 to prevent external impurities from contaminating the composite filter element 10, and to cover the outer wall of multiple water flow channels of the filter bottle cover 410 to ensure the consistency of the appearance of the composite filter element 10.

[0052] The filter bottle cap 410 has multiple water passages arranged side by side, including a first inlet 411, a first outlet 412, a second inlet 413, a wastewater outlet 415, and a second outlet 414. Considering that the filter bottle cap 410 is connected to the filter bottle 100 and the filter element cap 430 is connected to the front and rear filter assemblies 200, the filter element cap 430 correspondingly has a front filter element inlet 431, a front filter element outlet 432, and a rear filter element outlet 433, which are respectively connected to the first inlet 411, the first outlet 412, and the second outlet 414.

[0053] In addition, this composite filter element 10 has a major advantage, namely, it is easy to replace the composite filter element 10 and the pre- and post-filter components 200. The filter bottle handle 420 is rotated and engaged with the filter bottle cover 410. When it is necessary to replace the entire composite filter element 10, the filter bottle handle 420, which is originally flush with the filter bottle cover 410, is flipped over, and the entire composite filter element 10 is then lifted out of the water purification device.

[0054] The lifespan of the pre- and post-filter components 200 is generally shorter than that of the reverse osmosis filter component 300. When the lifespan of the pre- and post-filter components 200 expires, directly replacing the pre- and post-filter components 200 better meets the user's need to reduce filter replacement costs. Therefore, the filter element handle 440 is rotated and engaged with the filter element cover 430, and the pre- and post-filter components 200 are detachably installed inside the reverse osmosis filter component 300. Thus, the pre- and post-filter components 200 can be lifted out of the reverse osmosis filter component 300 as a whole through the filter element handle 440, making it convenient to replace the pre- and post-filter components 200.

[0055] In addition, the structure of this composite filter element 10 further increases the size of the pre-filter element 210, post-filter element 220, and reverse osmosis filter element 310, thereby increasing the influent flow rate of the composite filter element 10, which can reach over 1000G. Therefore, during high-flow-rate influent processes, a booster pump is often required for pressurization. The filter cover assembly 400 also includes multiple adapters 450, which are respectively connected to multiple water passages on the filter cover 410. These adapters 450 are configured as metal parts to accommodate larger influent or effluent pressures.

[0056] Please see Figure 4 , Figure 5 , Figure 6 , Figure 10 and Figure 11 The pre- and post-filter assembly 200 includes a filter cover 430, a pre-filter 210, a post-filter 220, a water outlet pipe 230, a welding plate 240, an upper end cover 250, a lower end cover 260, and an inner cylinder 270. The filter cover 430 is sealed to the upper end cover 250. The pre-filter 210 is disposed between the upper end cover 250 and the inner cylinder 270, while the post-filter 220 is disposed inside the inner cylinder 270. The pre-filter 210 and the post-filter 220 can be arranged vertically, horizontally, or internally and externally; their specific positions are not limited. The pre-filter 210 and the post-filter 220 are separated by the inner cylinder 270, so that when the pre-filter assembly 200 is installed in a device with water purification function, the inner cylinder 270 and other structures in the composite filter 10 enclose each other to form an independent first filter chamber 710 and a second filter chamber 720. The pre-filter 210 and the post-filter 220 are respectively arranged in the first filter chamber 710 and the second filter chamber 720, so that the water flow path through the pre-filter 210 and the water flow path through the post-filter 220 do not affect each other.

[0057] Since the pre-filter 210 is used to filter out most of the impurities in the raw water, its overall volume needs to be relatively large. However, the water passing through the post-filter 220 has already undergone two filtrations—the pre-filter 210 and the reverse osmosis filter 310—resulting in a very low solute content. Therefore, the post-filter 220 can be relatively smaller. Arranging the pre-filter 210 and post-filter 220 vertically ensures good filtration while further reducing the axial space occupied by the pre- and post-filter assembly 200. Specifically, the pre-filter 210 is located above the post-filter 220, i.e., it is positioned close to the filter cover 430, while the post-filter 220 is positioned on the side of the pre-filter 210 away from the filter cover 430.

[0058] Both the pre-filter 210 and the post-filter 220 are hollow cylindrical. One end of the pre-filter 210 is connected to the upper end cap 250, and the other end is connected to the upper surface of the inner cylinder 270. The connection between the pre-filter 210 and the upper end cap 250 and the inner cylinder 270 is adhesive bonding to prevent water from bypassing the pre-filter 210 for filtration and flowing directly out through the connection between the pre-filter 210 and the upper end cap 250 and the inner cylinder 270. Of course, the pre-filter 210 can also be connected to the upper end cap 250 and the inner cylinder 270 in other ways, and there are no specific limitations. The inner cylinder 270 can be cylindrical, and the post-filter 220 is disposed inside the cylindrical inner cylinder 270, separating the pre-filter 210 and the post-filter 220. The bottom of the cylindrical inner cylinder 270 is open, allowing the post-filter cartridge 220 to be inserted into it. This openness is sealed by the lower end cap 260. The post-filter cartridge 220, located inside the cylindrical inner cylinder 270, is bonded to the top of the inner cylinder 270 and the lower end cap 260 to prevent water from bypassing the post-filter cartridge 220 and flowing directly out through the connection between the post-filter cartridge 220 and the top and lower end cap 260 of the inner cylinder 270. Of course, other methods can also be used to connect the post-filter cartridge 220 to the top and lower end cap 260 of the inner cylinder 270; no specific limitations are imposed on this.

[0059] The length of the pre-filter 210 is greater than the length of the post-filter 220 to ensure the filtration effect of both the pre-filter 210 and the post-filter 220. Furthermore, the length of the pre-filter 210 is 2-3 times the length of the post-filter 220.

[0060] It should be noted that, in order to ensure the compactness and miniaturization of the pre- and post-filter assembly 200, since the pre-filter element 210 is hollow cylindrical and the post-filter element 220 is located below the pre-filter element 210, a water outlet pipe 230 can be provided inside the pre-filter element 210. One end of the water outlet pipe 230 is connected to the water outlet side of the post-filter element 220, and the other end is connected to the water outlet channel on the filter element cover 430. This allows the water inlet and outlet channels of the pre- and post-filter assembly 200 to be integrated on the filter element cover 430, ensuring the compactness of the pre- and post-filter assembly 200 and achieving miniaturization of the pre- and post-filter assembly 200 and the composite filter element 10 on which the pre- and post-filter assembly 200 is installed. To ensure the independence of the water flow path of the post-filter 220 from that of the pre-filter 210, a corresponding sealing structure can be set to ensure the sealing of both ends of the water outlet pipe 230. For example, two welded pieces 240 are connected to the filter cover 430 and the inner cylinder 270 respectively to form a sealing groove for the sealing element. The sealing element is installed in the sealing groove to limit the position of the sealing element. At the same time, the sealing effect of the sealing element seals both ends of the water outlet pipe 230.

[0061] The composite filter element 10 proposed in this invention has the following specific flow path:

[0062] Raw water flows into the first water passage 610 through the inlet 431 of the pre-filter cartridge. After being filtered by the pre-filter cartridge 210, it flows out through the water outlet channel between the inner wall of the pre-filter cartridge 210 and the outer wall of the outlet pipe 230, and then flows out through the outlet 432 of the pre-filter cartridge. The water flowing out of the outlet 432 of the pre-filter cartridge is pressurized by the booster pump and flows into the second water passage 620 through the inlet of the reverse osmosis cartridge 310. Water enters from the side of the reverse osmosis cartridge 310 (this refers to the reverse osmosis cartridge 310 using a 3D water-saving membrane; if the reverse osmosis cartridge 310 uses a regular membrane, water enters from the bottom of the reverse osmosis cartridge 310). After being filtered by the reverse osmosis cartridge 310, the water flow is divided into two paths: a pure water path and a wastewater path. The pure water flows to the post-filter cartridge 220 for further filtration, and the wastewater flows out of the composite filter cartridge 10 through the wastewater outlet 415. The pure water first flows through the first water passage 341 on the central pipe 340 to the third water passage 630, and then flows through the second water passage 271 on the inner cylinder 270 to the post-filter 220 for filtration. The pure water filtered by the post-filter 220 flows from the inside of the post-filter 220 to the outlet pipe 230, and finally flows out from the outlet 433 of the post-filter for user use.

[0063] Based on the composite filter element 10 described above, in this embodiment, please refer to... Figure 1 and Figure 2Considering that, in order to enable the pre- and post-filter assemblies 200 to be installed in place, an installation groove 416 is provided at the upper end of the filter bottle cover 410, and an installation opening 416a is provided at the bottom of the installation groove 416. The installation opening 416a is circular. The filter bottle cover 410 is installed into the installation groove 416, and a portion of the filter element cover 430 and the installation groove 416 have a groove bottom 416b located at the outer edge of the installation opening 416a. The groove bottom 416b is a continuous plane in the circumferential direction. The filter element cover 430 is detachably installed in the installation opening 416a, the filter element cover 430 is limited within the installation groove 416, and the filter element cover 430 fits against the groove bottom 416b.

[0064] It should be noted that the mounting port 416a is circular, and its outer edge is a continuously formed groove bottom 416b, which is planar. The filter element cover 430 is installed to prevent uneven stress on the sealing ring 500a when it is installed into the mounting port 416a. Furthermore, the filter element cover 430 fits snugly against the groove bottom 416b, ensuring it is properly installed and allowing the pre- and post-filter assemblies 200 connected to it to be installed correctly.

[0065] The technical solution of the present invention employs a continuous, planar groove bottom 416b provided on the outer edge of the mounting port 416a, so that when the filter cover 430 is installed, the sealing ring 500a fitted on its outer periphery is simultaneously subjected to force in the circumferential direction, thereby enabling the filter cover 430 to be installed in place, and thus enabling the filter module connected to the filter cover 430 to be installed in place.

[0066] In one embodiment, please refer to Figure 2 The composite filter element 10 also includes a sealing ring 500a, which is sleeved on the filter element cover 430 and is interference-fitted with the hole wall of the mounting port 416a.

[0067] It should be noted that the composite filter element 10 also includes a sealing ring 500a sleeved on the outside of the filter element cover 430. The sealing ring 500a achieves a sealed connection between the filter element cover 430 and the filter bottle cover 410. The sealing ring 500a is press-fitted with both the filter element cover 430 and the filter bottle cover 410. When it is necessary to remove the filter element cover 430 and the filter element connected to the lower side of the filter element cover 430, simply pull the filter element handle 440. When a larger force is applied, the sealed connection between the filter element cover 430 and the filter bottle cover 410 can be made to replace the filter element cover 430 and the front and rear filter assemblies 200 connected to it.

[0068] Further, please refer to Figure 2 and Figure 7The filter element cover 430 includes a main body 434 and a connecting part 435 connected to each other. The main body 434 is located above the mounting port 416a. The groove bottom 416b supports the bottom surface of the main body 434. The connecting part 435 extends into the mounting port 416a. The sealing ring 500a is located between the connecting part 435 and the filter bottle cover 410.

[0069] It should be noted that the filter element cover 430 includes a main body 434 and a connecting part 435. The main body 434 is connected to the water passage outside the composite filter element 10, and the water passage inside the connecting part 435 is connected to the water passage inside the main body 434. The connecting part 435 is used to assemble the composite filter element 10 with the filter element cover 430. Therefore, the sealing element is located between the connecting part 435 and the filter bottle cover 410.

[0070] In one embodiment, please continue to refer to Figure 2 and 7 The main body 434 protrudes from the outer periphery of the connecting part 435 and is provided with a mounting plate 434a and two lugs 434b. The groove bottom 416b includes an annular surface 416b1, a first bearing surface 416b2 and two second bearing surfaces 416b3. The first bearing surface 416b2 supports the mounting plate 434a, and the two second bearing surfaces 416b3 support the two lugs 434b. The annular surface 416b1 is connected to the first bearing surface 416b2 and the two second bearing surfaces 416b3 respectively.

[0071] It should be noted that the mounting groove 416 is mainly used to limit the main body 434. The main body 434 has a locking platform 434a protruding from the outer periphery of the connecting part 435 and two lugs 434b. The bottom of the groove 416b has an annular surface 416b1, a first bearing surface 416b2 and two second bearing surfaces 416b3 respectively supporting the main body 434. The first bearing surface 416b2 supports the locking platform 434a, and the two second bearing surfaces 416b3 support the two lugs 434b. The annular surface 416b1 connects the first bearing surface 416b2 and the two second bearing surfaces 416b3, and the annular surface 416b1, the first bearing surface 416b2 and the two second bearing surfaces 416b3 are located on the same plane.

[0072] In one embodiment, please refer to Figure 2 The filter bottle cap 410 is provided with two limiting platforms 417, which extend toward the interior of the receiving groove. The two limiting platforms 417 and the side wall of the mounting groove 416 together limit the carding platform 434a.

[0073] The filter bottle cover 410 is provided with two limiting platforms 417. The two limiting platforms extend into the receiving groove together and limit the locking platform 434a together, thereby fixing the relative position of the filter element cover 430 and preventing the filter element cover 430 from rotating or shaking.

[0074] In one embodiment, please refer to Figure 1 and Figure 2 The filter bottle cap 410 is provided with a stepped stage 418 located above the bottom of the tank 416b. The stepped stage 418 has two notched grooves 418a that extend to the bottom of the tank 416b. The notches of the notched grooves 418a are oriented towards the filter element cap 430. The two lugs 434b are respectively limited within the two notched grooves 418a.

[0075] It should be noted that the stage 418 is used to cooperate with the filter cover 430 to fix the filter cover 430 at the opposite end and prevent it from shaking violently when the water pressure is high. The stage 418 has two notches 418a, which are used to limit the two lugs 434b respectively to prevent the filter cover 430 from rotating around its circumference.

[0076] In one embodiment, please refer to Figure 2 A platform 418 is provided on the bottom of the groove 416b, and the platform 418 has a distance D from the mounting port 416a.

[0077] Specifically, there is a gap D between the stage 418 and the mounting port 416a. Considering that the stage 418 only surrounds half of the mounting port 416a, the sealing ring 500a will not contact the stage 418 when it is installed downwards, thus preventing uneven force on the sealing ring 500a during installation.

[0078] For further information, please refer to [link / reference]. Figure 1 and Figure 2 The range of D is satisfied that D≥0.1mm. When the spacing D is greater than or equal to 0.1mm, the sealing ring 500a will not be subjected to the squeezing force of stage 418 during installation. It should be noted that the composite filter element 10 should be designed to be as small as possible, so the spacing D should not be too large, so D should be less than or equal to 0.5mm.

[0079] In one embodiment, please continue to refer to Figure 2The outer diameter of the sealing ring 500a is the same as the diameter of the mounting port 416a. Only when the outer diameter of the sealing ring 500a is the same as the diameter of the mounting port 416a can the sealing ring 500a and the inner wall of the mounting port 416a be interference-fitted. Generally speaking, the outer diameter of the sealing ring 500a should be equal to the diameter of the mounting port 416a, or slightly larger than the diameter of the mounting port 416a (the size is small, so it is not limited), so that the sealing ring 500a and the inner wall of the mounting port 416a can be interference-fitted well.

[0080] In one embodiment, please continue to refer to Figure 2 The periphery of the mounting port 416a is chamfered, which facilitates the installation of the front and rear filter components 200 into the mounting port 416a.

[0081] The present invention also proposes a device with a water purification function, 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 device with a water purification function 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.

[0082] 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 filter cap assembly for composite filter cartridges, characterized in that, include: A filter bottle cap is provided for covering a filter bottle. The upper side of the filter bottle cap has an installation groove, and the bottom of the installation groove has an installation opening. The installation groove has a groove bottom located outside the installation opening. A filter element cover, wherein the filter element cover is positioned within the mounting groove and is fitted to the bottom of the groove; A sealing ring is fitted onto the filter element cover, and the filter element cover is detachably connected to the mounting port via the sealing ring. The groove bottom is provided with a platform, and the platform is spaced D apart from the mounting opening, wherein D is greater than or equal to 0.1 mm; the groove bottom is planar; the groove bottom includes an annular surface, a first bearing surface and a second bearing surface, the annular surface being connected to the first bearing surface and the second bearing surface respectively, and the annular surface being closer to the mounting opening than the first bearing surface and the second bearing surface.

2. The filter cap assembly as claimed in claim 1, characterized in that, The mounting port is circular.

3. The filter cap assembly as described in claim 1, characterized in that, The filter cover includes a main body and a connecting part connected to each other. The main body is located above the mounting port, the bottom of the groove supports the bottom surface of the main body, and the connecting part extends into the mounting port.

4. The filter cap assembly as described in claim 3, characterized in that, The main body protrudes from the outer periphery of the connecting part and is provided with a mounting plate and two lugs. The first bearing surface supports the mounting plate, and the two second bearing surfaces support the two lugs.

5. The filter cap assembly as described in claim 4, characterized in that, The filter bottle cap is provided with two limiting platforms, which extend toward the interior of the mounting groove and limit the locking platform.

6. The filter cap assembly as claimed in claim 4, characterized in that, The stage has two notches, which extend to the bottom of the stage. The notches face the filter cover, and the two lugs are respectively confined within the two notches.

7. The filter cap assembly as claimed in claim 1, characterized in that, The periphery of the mounting port is chamfered.

8. A composite filter element, characterized in that, Includes the filter cap assembly as described in any one of claims 1 to 7.

9. A device with a water purification function, characterized in that, Includes the composite filter element as described in claim 8.

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