Post-filtering device and water purifying equipment

Abstract

The utility model provides a rear filtering device and water purifying equipment, and the rear filtering device comprises a first filtering group, a second filtering group and a third filtering group, the second filtering group is arranged on the first filtering group in a sleeving manner, and the second filtering group is used for communicating the first filtering group with an external water supply device, so that water output by the external water supply device is filtered by the second filtering group and then is conveyed to the first filtering group; and the water outlet module is arranged at the first axial end of the second filtering group, extends in the direction deviating from the first axial end of the second filtering group, and is provided with a pure water outlet flow channel, and the pure water outlet flow channel is communicated with the pure water flow channel. According to the rear-mounted filtering device, a pure water outlet flow channel can be separated from the position between a first filtering set and a second filtering set, so that the pure water outlet flow channel does not occupy the space between the first filtering set and the second filtering set, the radial size of the rear-mounted filtering device can be reduced, and the rear-mounted filtering device does not occupy too much space in the radial direction.

Description

Technical Field

[0001] This application relates to the field of water purification technology, and in particular to a post-filtration device and water purification equipment. Background Technology

[0002] With economic development and social progress, people have increasingly higher requirements for drinking water. Most households are now equipped with water purification equipment, such as water softeners, ultrafiltration machines, and reverse osmosis water purifiers. The emergence of different types of water purification equipment meets people's diverse water needs, improves their living standards, and enhances their water health.

[0003] Currently, some water purification equipment on the market uses a composite filter structure. This structure mainly includes a pre-filter and a post-filter, arranged sequentially along the axial direction of the composite filter structure. The pre-filter performs preliminary filtration of the raw water, while the post-filter further filters the pre-filtered water to obtain pure water. However, because the outlet channel of the post-filter is located between two adjacent filter elements, it occupies internal space, resulting in a larger radial dimension for the post-filter. Utility Model Content

[0004] This application provides a post-filtration device and a water purification equipment to solve the problem of large radial dimensions in related technologies. The technical solution is as follows:

[0005] In a first aspect, embodiments of this application provide a post-filtering device, comprising:

[0006] The first filter group has a pure water flow channel;

[0007] The second filter group is fitted onto the first filter group and is used to connect the first filter group and an external water supply device.

[0008] A water outlet module is disposed on the first axial end of the second filter group and extends in a direction away from the first axial end of the second filter group. The water outlet module has a pure water outlet channel and the pure water outlet channel is connected to the pure water channel.

[0009] In one embodiment, the second filter assembly has a wastewater flow channel;

[0010] The water outlet module also has a wastewater outlet channel, which is connected to the wastewater channel.

[0011] In one embodiment, the wastewater outlet channel is arranged around the pure water outlet channel.

[0012] In one embodiment, the water outlet module includes:

[0013] An outer tube, wherein the outer tube is disposed on the axial first end of the second filter group, the outer tube extends in a direction away from the axial first end of the second filter group, and the outer tube has a mounting cavity; and

[0014] An inner tube is inserted into the mounting cavity. The inner tube has a pure water outlet channel, and the outer wall of the inner tube and the side wall of the mounting cavity form the wastewater outlet channel.

[0015] In one embodiment, the sidewall of the mounting cavity is provided with a plurality of isolation protrusions, the plurality of isolation protrusions being arranged around the axial centerline of the mounting cavity, and the plurality of isolation protrusions abutting against the outer peripheral wall of the inner tube.

[0016] In one embodiment, the first filter group includes:

[0017] A first filter element having a through hole extending along the axial direction of the first filter element;

[0018] A support tube is provided in the through hole to support the first filter element. The support tube has a pure water flow channel that is connected to the first filter element.

[0019] The first inner end cap is disposed on the first axial end of the support tube, and the first inner end cap abuts against the first axial end of the first filter element.

[0020] A second inner end cap is disposed on the axial second end of the support tube, and the second inner end cap abuts against the axial second end of the first filter element; and

[0021] A protective sleeve is fitted onto the outer peripheral wall of the first filter element. One end of the protective sleeve is connected to the first inner end cap, and the other end of the protective sleeve is connected to the second inner end cap. The protective sleeve has a second water outlet hole, which connects the first filter element and the second filter assembly.

[0022] In one embodiment, the protective sleeve has a first snap-fit ​​portion at its first axial end and a second snap-fit ​​portion at its second axial end.

[0023] The first inner end cover is provided with a third snap-fit ​​portion, which is adapted to the first snap-fit ​​portion to connect the first inner end cover and the protective sleeve together;

[0024] The second inner end cover is provided with a fourth snap-fit ​​portion, which is adapted to the second snap-fit ​​portion to connect the second inner end cover and the protective sleeve together.

[0025] In one embodiment, the first inner end cap has a mounting hole that communicates with the pure water flow channel, and the axial first end of the water outlet module is inserted into the mounting hole.

[0026] In one embodiment, a first sealing element is provided between the outer peripheral wall of the first axial end of the water outlet module and the wall of the mounting hole, the first sealing element being used to seal the gap between the water outlet module and the mounting hole.

[0027] In one embodiment, the second filter group includes:

[0028] The second filter element is sleeved on the outer peripheral wall of the first filter assembly;

[0029] A first outer end cap, which is sleeved on the axial first end of the second filter element and the axial first end of the first filter assembly; and

[0030] The second outer end cap is sleeved on the second axial end of the second filter element and abuts against the second axial end of the first filter group.

[0031] In one embodiment, the outer peripheral wall of the second filter element is provided with a colloid, the colloid covering the outer peripheral wall of the second filter element, and the colloid connecting the first outer end cap and the second outer end cap.

[0032] In one embodiment, the sidewall of the mounting cavity is provided with a plurality of isolation protrusions, the plurality of isolation protrusions being arranged around the axial centerline of the mounting cavity, and the plurality of isolation protrusions abutting against the outer peripheral wall of the inner tube.

[0033] Secondly, embodiments of this application provide a water purification device, including the aforementioned post-filtration device.

[0034] The advantages or beneficial effects of the above technical solutions include at least the following:

[0035] This utility model discloses a post-filtration device, comprising a first filter group, a second filter group, and a water outlet module. The second filter group is fitted onto the first filter group, meaning the first filter group is located within the second filter group. This improves the utilization rate of the internal space of the second filter group and reduces the overall volume of the post-filtration device. The second filter group connects to the first filter group and an external water supply device, allowing water from the external water supply device to be filtered by the second filter group before being delivered to the first filter group. The purified water filtered by the first filter group is then delivered to a purified water channel, which is connected to the purified water outlet channel, enabling purified water within the purified water channel to be delivered to the outside of the post-filtration device. For drinking; wherein, since the water outlet module is located on the first axial end of the second filter group, the water outlet module extends in a direction away from the first axial end of the second filter group, and the water outlet module is provided with a pure water outlet channel, the pure water outlet channel and the first filter group or the second filter group are arranged one by one along the axial direction of the post-filter device, thereby separating the pure water outlet channel from the first filter group and the second filter group, so that the pure water outlet channel does not occupy the space between the first filter group and the second filter group. At the same time, it improves the axial space utilization rate of the post-filter device, reduces the radial dimension of the post-filter device, and prevents the post-filter device from occupying too much space in the radial direction.

[0036] The above overview is for illustrative purposes only and is not intended to be limiting in any way. In addition to the illustrative aspects, embodiments, and features described above, further aspects, embodiments, and features of this application will become readily apparent from the accompanying drawings and the following detailed description. Attached Figure Description

[0037] In the accompanying drawings, unless otherwise specified, the same reference numerals throughout the various drawings denote the same or similar parts or elements. These drawings are not necessarily drawn to scale. It should be understood that these drawings depict only some embodiments disclosed in this application and should not be construed as limiting the scope of this application.

[0038] Figure 1 This is a three-dimensional structural diagram of the post-filter device of this utility model;

[0039] Figure 2 This is a cross-sectional view of the post-filter device of this utility model;

[0040] Figure 3 This is a three-dimensional structural diagram of the first filter group in this utility model;

[0041] Figure 4 This is an exploded view of the first filter group in this utility model;

[0042] Figure 5 This is a three-dimensional structural diagram of the second inner end cap in this utility model;

[0043] Figure 6 This is a three-dimensional structural diagram of the first outer end cap in this utility model;

[0044] Figure 7 This is a cross-sectional view of the first outer end cap in this utility model;

[0045] Figure 8 This is a three-dimensional structural diagram of the second outer end cap in this utility model.

[0046] Figure Labels

[0047] 1. First filter assembly; 11. Support tube; 111. Pure water flow channel; 112. First water outlet; 113. First inner end cap; 1131. Mounting hole; 1132. Third snap-fit ​​part; 12. First filter element; 13. Second inner end cap; 131. Fourth snap-fit ​​part; 132. Positioning hole; 14. Protective sleeve; 141. Second water outlet; 142. First snap-fit ​​part; 143. Second snap-fit ​​part; 2. Second filter assembly; 21. Second filter element; 22. 1. First outer end cap; 222. First connecting groove; 223. Third water outlet hole; 23. Second outer end cap; 231. Water inlet; 232. Second connecting groove; 233. Snap-fit ​​protrusion; 3. Water outlet module; 31. Outer pipe; 311. Mounting cavity; 312. Isolation protrusion; 32. Inner pipe; 321. Pure water outlet channel; 33. Wastewater outlet channel; 4. First sealing element; 5. Second sealing element; 6. First limiting ring; 7. Second limiting ring. Detailed Implementation

[0048] In the following description, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments can be modified in various ways without departing from the spirit or scope of this application. Therefore, the drawings and description are considered to be exemplary in nature and not restrictive.

[0049] See Figures 1-8 This invention illustrates a preferred embodiment of a post-filtration device, comprising:

[0050] The first filter group 1 has a pure water flow channel 111, which is located at the center of the first filter group 1 and extends along the axial direction of the first filter group 1.

[0051] The second filter group 2 is fitted onto the first filter group 1, meaning the first filter group 1 is located inside the second filter group 2. The second filter group 2 connects the first filter group 1 to an external water supply device, allowing water from the external water supply device to be filtered by the second filter group 2 before being delivered to the first filter group 1; and

[0052] Water outlet module 3 is located on the first axial end of the second filter group 2. Water outlet module 3 extends in a direction away from the first axial end of the second filter group 2. Water outlet module 3 has a pure water outlet channel 321, which is connected to pure water channel 111.

[0053] The post-filtration device of this utility model includes a first filter group 1, a second filter group 2, and a water outlet module 3. The second filter group 2 is sleeved on the first filter group 1, that is, the first filter group 1 is set inside the second filter group 2, which improves the utilization rate of the internal space of the second filter group 2 and can reduce the overall volume of the post-filtration device. The second filter group 2 can connect the first filter group 1 and an external water supply device, so that the water output from the external water supply device is filtered by the second filter group 2 and then sent to the first filter group 1. The pure water filtered by the first filter group 1 is sent to the pure water channel 111. The pure water outlet channel 321 is connected to the pure water channel 111, so that the pure water in the pure water channel 111 can be sent to the post-filtration device through the pure water outlet channel 321. In addition, it is used for drinking; wherein, since the water outlet module 3 is located on the first axial end of the second filter group 2, the water outlet module 3 extends in a direction away from the first axial end of the second filter group 2, and the water outlet module 3 is provided with a pure water outlet channel 321, the pure water outlet channel 321 and the first filter group 1 or the second filter group 2 are arranged one by one along the axial direction of the post-filter device, so that the pure water outlet channel 321 is separated from the first filter group 1 and the second filter group 2, so that the pure water outlet channel 321 will not occupy the space between the first filter group 1 and the second filter group 2. At the same time, the axial space utilization rate of the post-filter device is improved, and the radial dimension of the post-filter device can be reduced, so that the post-filter device will not occupy too much space in the radial direction.

[0054] In one embodiment, the water outlet module 3 is used to insert into the receiving hole in the pre-filter device to improve the internal space utilization of the pre-filter device. At the same time, it prevents the post-filter device and the pre-filter device from occupying too much axial space of the composite filter structure, which helps to reduce the overall volume of the composite filter structure and thus reduce the space occupied by the water purification equipment.

[0055] In one embodiment, the second filter assembly 2 has a wastewater flow channel;

[0056] The water outlet module 3 also has a wastewater outlet channel 33, which is connected to the wastewater channel to transport the wastewater generated by the second filter group 2 to the outside of the post-filter device for discharge. The wastewater outlet channel 33 on the water outlet module 3 improves the utilization rate of the internal space of the water outlet module 3. At the same time, it separates the wastewater outlet channel 33 from the space between the first filter group 1 and the second filter group 2, which can further reduce the radial dimension of the post-filter device.

[0057] In one embodiment, the wastewater outlet channel 33 is arranged around the pure water outlet channel 321. This allows both the pure water outlet channel 321 and the wastewater outlet channel 33 to have sufficiently large cross-sectional areas, thereby improving the pure water outlet efficiency and the wastewater outlet efficiency. At the same time, it improves the utilization rate of the internal space of the outlet module 3, which helps to reduce the radial dimension of the outlet module 3, so that the outlet module 3 can be adapted to the size of the receiving hole in the pre-filter device.

[0058] See Figure 2 In one embodiment, the water outlet module 3 includes:

[0059] An outer tube 31 is disposed on the axial first end of the second filter group 2, and extends in a direction away from the axial first end of the second filter group 2. The outer tube 31 has a mounting cavity 311, which extends axially along the outer tube 31.

[0060] The inner tube 32 is inserted into the mounting cavity 311, meaning at least a portion of the inner tube 32 is located inside the outer tube 31. The inner tube 32 has a pure water outlet channel 321, and the outer wall of the inner tube 32 and the side wall of the mounting cavity 311 form a wastewater outlet channel 33, effectively isolating the pure water outlet channel 321 and the wastewater outlet channel 33 to prevent cross-flow of pure water and wastewater. This improves the purity of the pure water and also increases the efficiency of pure water preparation. In addition, since the inner tube 32 is inserted into the mounting cavity 311, the internal space utilization rate of the outer tube 31 is improved, which can reduce the overall volume of the post-filter device, so that the post-filter device does not occupy too much space and is more convenient to install. At the same time, it helps to reduce the overall volume of the water purification equipment using the post-filter device.

[0061] See Figures 2-4 In one embodiment, the first filter group 1 includes:

[0062] A support pipe 11 has a pure water flow channel 111 and a first water outlet 112. The pure water flow channel 111 is located at the center of the support pipe 11 and extends axially along the support pipe 11. One end of the pure water flow channel 111 is closed and the other end is open. The open end of the pure water flow channel 111 is connected to the pure water outlet flow channel 321, so that pure water in the pure water flow channel 111 can only be transported to the pure water outlet flow channel 321 through its open end. The first water outlet 112 is located on the side wall of the support pipe 11 and is connected to the pure water flow channel 111.

[0063] The first filter element 12 is sleeved on the outer peripheral wall of the support tube 11 and connects to the first water outlet 112 and the second filter group 2. By sleeved on the support tube 11, the first filter element 12 can be supported and positioned, improving the assembly stability of the first filter element 12 and ensuring that the first filter element 12 can perform deep filtration on the water output from the second filter group 2. The pure water obtained after filtration by the first filter element 12 is transported to the pure water flow channel 111 through the first water outlet 112, so that the pure water is smoothly transported to the pure water outlet flow channel 321 along the pure water flow channel 111. At the same time, it can also protect the first filter element 12 and prevent it from being damaged.

[0064] See Figures 2-4 In one embodiment, the first axial end of the support tube 11 is provided with a first inner end cap 113, which covers the first axial end of the first filter element 12. The first inner end cap 113 has a mounting hole 1131, which is connected to the pure water flow channel 111. The first axial end of the water outlet module 3 is inserted into the mounting hole 1131. By covering the axial first end of the first filter element 12 with the first inner end cap 113, the axial first end of the first filter element 12 is sealed, restricting water in the first filter element 12 from passing through the axial first end of the first filter element 12. This ensures that the water in the first filter element 12 can only flow within the first filter element 12 or can only flow radially along the first filter element 12, thus ensuring that the pure water filtered by the first filter element 12 can only flow to the pure water flow channel 111, ensuring directional flow of pure water. Secondly, the first inner end cap 113 is used to axially limit the first filter element 12, ensuring that the first filter element 12 is reliably installed in the set position of the support tube 11. In addition, by providing a mounting hole 1131 that connects to the pure water flow channel 111 in the first inner end cap 113, the axial first end of the water outlet module 3 is inserted into the mounting hole 1131, thereby connecting the water outlet module 3 and the first inner end cap 113 together, improving the assembly stability of the water outlet module 3.

[0065] See Figures 2-4 In one embodiment, the first filter group 1 further includes:

[0066] The second inner end cap 13 is sleeved on the axial second end of the support tube 11. The second inner end cap 13 covers the axial second end of the first filter element 12 to seal the axial second end of the first filter element 12, restricting water in the first filter element 12 from passing through the axial second end of the first filter element 12. This ensures that the water in the first filter element 12 can only flow within the first filter element 12 or only flow radially along the first filter element 12, thus ensuring that the pure water filtered by the first filter element 12 can only flow to the pure water channel 111, ensuring directional flow of pure water. Secondly, the second inner end cap 13 is used to axially restrict the first filter element 12. The first filter element 12 is reliably installed in the set position on the support tube 11 to prevent it from detaching from the support tube 11. In addition, the support tube 11, the first filter element 12, the first inner end cap 113 and the second inner end cap 13 form a modular first filter group 1. The second filter group 2 can be installed outside the first filter group 1 after the support tube 11, the first filter element 12, the first inner end cap 113 and the second inner end cap 13 are assembled to form the first filter group 1. This makes the assembly of the post-filter device simpler and more convenient, greatly improves the assembly efficiency of the post-filter device, and thus reduces the cost of the post-filter device.

[0067] See Figures 2-4 In one embodiment, the first filter group 1 further includes:

[0068] The protective sleeve 14 is fitted onto the outer peripheral wall of the first filter element 12. One end of the protective sleeve 14 is connected to the first inner end cap 113, and the other end of the protective sleeve 14 is connected to the second inner end cap 13. The side wall of the protective sleeve 14 has a second water outlet hole 141, which connects the first filter element 12 and the second filter group 2.

[0069] By inserting the support tube 11 into the through hole of the first filter element 12, the support tube 11 can provide internal support for the first filter element 12. By placing the first inner end cap 113 on the axial first end of the support tube 11, with the first inner end cap 113 abutting against the axial first end of the first filter element 12, and placing the second inner end cap 13 on the axial second end of the support tube 11, with the second inner end cap 13 abutting against the axial second end of the first filter element 12, the first filter element 12 is axially limited, thus achieving a solid state. The first filter element 12 is fixed in place to ensure that it is reliably installed on the support tube 11, so that the support tube 11 can effectively provide internal support for the first filter element 12. A protective sleeve 14 is fitted onto the outer peripheral wall of the first filter element 12, with one end of the protective sleeve 14 connected to a first inner end cap 113 and the other end connected to a second inner end cap 13. The first and second inner end caps 113 respectively support the two ends of the protective sleeve 14, preventing the protective sleeve 14 from damaging the first filter element 12. The filter element 12 is compressed, and the protective sleeve 14 can be used to externally support the first filter element 12. When the second filter group 2 needs to be installed on the outer peripheral wall of the protective sleeve 14, both the protective sleeve 14 and the support tube 11 can share the pressure of the second filter group 2, so that the pressure of the second filter group 2 is not applied to the first filter element 12, or the pressure applied by the second filter group 2 to the first filter element 12 is reduced, which plays a dual protection role and enhances the protective effect of the first filter element 12. Compared with the existing technology that only provides internal or external support for the first filter element 12, the first filter element 12 in this first filter group 1 is less prone to damage, thus reducing the cost of the first filter group 1. In addition, the first filter group 1, composed of the first filter element 12, the support tube 11, the first inner end cap 113, the second inner end cap 13 and the protective sleeve 14, is a modular structure, which can realize the standardized assembly of this first filter group 1, improve production efficiency, and further reduce the cost of the first filter group 1.

[0070] In one embodiment, one end of the protective sleeve 14 is provided with a first snap-fit ​​portion 142, and the other end of the protective sleeve 14 is provided with a second snap-fit ​​portion 143.

[0071] The first inner end cover 113 is provided with a third snap-fit ​​part 1132, which is adapted to the first snap-fit ​​part 142 to connect the first inner end cover 113 and the protective sleeve 14 together. This enables tool-free connection between the protective sleeve 14 and the first inner end cover 113, making the connection operation simpler and more convenient, and improving assembly efficiency.

[0072] The second inner end cap 13 is provided with a fourth snap-fit ​​part 131, which is adapted to the second snap-fit ​​part 143 to connect the second inner end cap 13 and the protective sleeve 14 together, thereby connecting the protective sleeve 14 and the second inner end cap 13 together. This enables tool-free connection of the protective sleeve 14 and the second inner end cap 13, making the connection operation simpler and more convenient, and improving assembly efficiency. The protective sleeve 14 is provided with a second water outlet 141, which connects the first filter element 12 and the second filter group 2, thus enabling communication between the first filter group 1 and the second filter group 2. This allows water filtered by the second filter group 2 to be delivered to the first filter element 12 through the second water outlet 141.

[0073] In one embodiment, the first snap-fit ​​portion 142 and the third snap-fit ​​portion 1132 are, respectively, a snap-fit ​​groove and a snap-fit ​​protrusion. The snap-fit ​​protrusion is inserted into the snap-fit ​​groove to reliably connect the protective sleeve 14 and the first inner end cap 113 together.

[0074] In the second snap-fit ​​portion 143 and the fourth snap-fit ​​portion 131, one is a snap-fit ​​groove and the other is a snap-fit ​​protrusion. The snap-fit ​​protrusion is inserted into the snap-fit ​​groove to reliably connect the protective sleeve 14 and the second inner end cover 13 together.

[0075] Of course, in other embodiments, one end of the protective sleeve 14 can also be connected to the first inner end cap 113 by an adhesive, and the other end of the protective sleeve 14 can also be connected to the second inner end cap 13 by an adhesive.

[0076] Of course, in other embodiments, one end of the protective sleeve 14 can also be connected to the first inner end cap 113 by fasteners (such as screws or rivets), and the other end of the protective sleeve 14 can also be connected to the second inner end cap 13 by fasteners (such as screws or rivets).

[0077] See Figure 4 In one embodiment, the support tube 11 and the first inner end cap 113 are integrally formed, so that the support tube 11 and the first inner end cap 113 are connected without connection structure. This simplifies the structure and makes the support tube 11 and the first inner end cap 113 seamless, thereby improving the sealing performance of the support tube 11 and the first inner end cap 113 and preventing water leakage.

[0078] Of course, in other embodiments, the support tube 11 can be set separately from the first inner end cap 113, that is, the support tube 11 and the first inner end cap 113 are independent structures, and the support tube 11 and the first inner end cap 113 are connected together by a connecting structure.

[0079] See Figure 2 , Figure 4 as well as Figure 5In one embodiment, the second axial end of the support tube 11 is provided with a positioning part, and the second inner end cover 13 has a positioning hole 132. The positioning hole 132 and the positioning part are adapted to each other, that is, the positioning part is inserted into the positioning hole 132 to realize the installation and positioning of the second inner end cover 13, which facilitates the quick installation of the second inner end cover 13 and improves the connection stability between the second inner end cover 13 and the support tube 11.

[0080] See Figure 4 as well as Figure 5 The positioning part has a polygonal cross-section, and the positioning hole 132 is adapted to the positioning part. That is, the positioning hole 132 also has a polygonal cross-section, which can restrict the second inner end cover 13 from rotating around the axial center line of the support tube 11, which is conducive to further improving the assembly stability of the second inner end cover 13.

[0081] See Figure 4 as well as Figure 5 Both the positioning part and the positioning hole 132 have hexagonal cross-sections, which can increase the contact area between the support tube 11 and the second inner end cap 13, which is conducive to further improving the assembly stability of the second inner end cap 13, thereby reliably preventing the first filter element 12 from detaching from the support tube 11.

[0082] Of course, in other embodiments, the cross-sections of both the positioning part and the positioning hole 132 can be rectangular, pentagonal, octagonal, or other shapes.

[0083] See Figure 2 In one embodiment, a first sealing element 4 is provided between the outer peripheral wall of the first axial end of the water outlet module 3 and the wall of the mounting hole 1131. The first sealing element 4 is used to seal the gap between the water outlet module 3 and the mounting hole 1131, preventing the pure water output from the pure water channel 111 from flowing into the wastewater outlet channel 33 through the gap between the water outlet module 3 and the mounting hole 1131. That is, it ensures that the pure water output from the pure water channel 111 can only be delivered to the pure water outlet channel 321, thereby improving the pure water production efficiency. At the same time, it can also prevent... The water filtered by the second filter group 2 flows into the pure water channel 111 through the gap between the water outlet module 3 and the mounting hole 1131, thus preventing a decrease in the purity of the pure water in the pure water channel 111 and improving the purity of the pure water. In addition, it can also prevent the wastewater generated by the second filter group 2 from flowing into the pure water channel 111 through the gap between the water outlet module 3 and the mounting hole 1131, avoiding cross-contamination between wastewater and pure water, thereby preventing a decrease in the purity of the pure water in the pure water channel 111 and improving the purity of the pure water.

[0084] In one embodiment, the first sealing element 4 is specifically disposed between the outer peripheral wall of the first axial end of the outer tube 31 and the wall of the mounting hole 1131.

[0085] See Figure 2In one embodiment, the post-filter device further includes a first limiting ring 6, which is located inside the mounting hole 1131. The first limiting ring 6 is sleeved on the outer peripheral wall of the outer tube 31. The first axial end of the first limiting ring 6 abuts against the first sealing member 4, and the second axial end of the first limiting ring 6 abuts against the second filter group 2, so as to restrict the first sealing member 4 between the outer peripheral wall of the first axial end of the outer tube 31 and the hole wall of the mounting hole 1131, ensuring that the first sealing member 4 reliably seals the gap between the outer tube 31 and the mounting hole 1131.

[0086] See Figure 2 In one embodiment, a second sealing element 5 is provided between the outer peripheral wall of the first axial end of the inner tube 32 and the inner side wall of the first axial end of the mounting cavity 311. The second sealing element 5 is used to seal the gap between the outer peripheral wall of the first axial end of the inner tube 32 and the inner side wall of the first axial end of the mounting cavity 311, preventing the pure water output from the pure water channel 111 from flowing to the wastewater outlet channel 33 through the gap between the outer peripheral wall of the first axial end of the inner tube 32 and the inner side wall of the first axial end of the mounting cavity 311. That is, it ensures that the pure water output from the pure water channel 111 can only be delivered to the pure water outlet channel 321, thereby improving the pure water production efficiency.

[0087] See Figure 2 In one embodiment, the post-filter device further includes a second limiting ring 7, which is sandwiched between the axial first end of the outer tube 31 and the axial first end of the inner tube 32. The second limiting ring 7 is used to restrict the second sealing member 5 between the outer peripheral wall of the axial first end of the inner tube 32 and the inner side wall of the axial first end of the mounting cavity 311, so as to ensure that the second sealing member 5 reliably seals the gap between the outer peripheral wall of the axial first end of the inner tube 32 and the inner side wall of the axial first end of the mounting cavity 311.

[0088] See Figures 1-2 In one embodiment, the second filter group 2 includes:

[0089] The second filter element 21 is sleeved on the outer peripheral wall of the first filter group 1;

[0090] A first outer end cap 22 is sleeved on the axial first end of the second filter element 21 and the axial first end of the first filter group 1 to connect the axial first end of the second filter element 21 and the first filter group 1 together. The inner sidewall of the first outer end cap 22 and the axial first end of the second filter element 21 and the axial first end of the first filter group 1 form a wastewater channel, which connects to the wastewater outlet channel 33. The first outer end cap 22 is connected to the outer pipe 31.

[0091] The second outer end cap 23 is sleeved on the second axial end of the second filter element 21 and the second axial end of the first filter group 1 to connect the second axial end of the second filter element 21 and the first filter group 1 together, thereby forming a structurally stable post-filtration device. The second outer end cap 23 has a water inlet 231, which is used to connect the second axial end of the second filter element 21 to an external water supply device. By setting the water inlet 231 on the second outer end cap 23, the water inlet 231 can connect the second axial end of the second filter element 21 to the external water supply device, so that the water output from the external water supply device can be transported to the second filter element 21 for filtration through the water inlet 231. In addition, the second filter group 2, composed of the second filter element 21, the first outer end cap 22, and the second outer end cap 23, forms a modular structure, which facilitates the installation of the post-filtration device.

[0092] In one embodiment, the outer peripheral wall of the second filter element 21 is provided with a colloid (not shown in the figure). The colloid covers the outer peripheral wall of the second filter element 21 to seal the outer peripheral wall of the second filter element 21, restricting water in the second filter element 21 from passing through the outer peripheral wall of the second filter element 21. The colloid connects the first outer end cap 22 and the second outer end cap 23 to reliably install the first outer end cap 22 and the second end cap on the second filter element 21, thereby improving the assembly stability of the second filter assembly 2.

[0093] See Figures 6-7 In one embodiment, the first outer end cap 22 has a first connecting groove 222, which is adapted to the axial first end of the second filter element 21, that is, the axial first end of the second filter element 21 is inserted into the first connecting groove 222 to improve the connection stability of the first outer end cap 22 and the second filter element 21.

[0094] See Figures 6-7 In one embodiment, the first outer end cap 22 and the outer tube 31 are integrally formed, so that the first outer end cap 22 and the outer tube 31 are connected without connection structure, which can simplify the structure and improve the sealing performance of the first outer end cap 22 and the outer tube 31.

[0095] See Figures 6-7 The bottom wall of the first connecting groove 222 has a third water outlet 223. The third water outlet 223 connects the first axial end of the second filter element 21 and the mounting cavity 311, so that the second filter element 21 and the wastewater outlet channel 33 are connected, that is, the second filter group 2 and the wastewater outlet channel 33 are connected.

[0096] See Figure 7In one embodiment, the sidewall of the mounting cavity 311 is provided with a plurality of isolation protrusions 312. The plurality of isolation protrusions 312 are arranged around the axial center line of the mounting cavity 311. The plurality of isolation protrusions 312 abut against the outer peripheral wall of the inner tube 32 to separate the outer tube 31 and the inner tube 32, forming a wastewater outlet channel 33. At the same time, the isolation protrusions 312 are used to support and position the inner tube 32 to ensure that the inner tube 32 can be reliably installed on the outer tube 31.

[0097] See Figure 8 In one embodiment, the second outer end cap 23 has a second connecting groove 232, which is adapted to the axial second end of the second filter element 21, that is, the axial second end of the second filter element 21 is inserted into the second connecting groove 232 to improve the assembly stability of the second outer end cap 23 and the second filter element 21.

[0098] See Figure 8 In one embodiment, the second outer end cap 23 is provided with a plurality of snap-fit ​​protrusions 233, which are arranged at intervals around the axial center line of the second outer end cap 23. The plurality of snap-fit ​​protrusions 233 are used to abut against the inner wall of the filter bottle of the composite filter element structure to position the post-filter device, restrict the movement of the post-filter device in the filter bottle, and ensure that the post-filter device is reliably installed in the filter bottle.

[0099] In one embodiment, the first filter element 12 is a carbon rod filter element, and the second filter element 21 is an RO membrane filter element. The RO membrane filter element removes small particles such as heavy metals, bacteria, and viruses from the water through reverse osmosis membrane technology, while the carbon rod filter element utilizes the excellent adsorption properties of activated carbon to effectively remove odors, residual chlorine, silica, and other organic substances from the water. The combination of the two can filter multiple pollutants at the same time, ensuring that the water quality is purer.

[0100] Of course, in other embodiments, the first filter element 12 and the second filter element 21 can be any type of filter element structure, as long as they can improve the purity of the water, and there is no limitation here.

[0101] A preferred embodiment of this utility model provides a water purification device, including the above-mentioned post-filtration device.

[0102] The water purification equipment of this utility model, due to the adoption of the above-mentioned post-filtration device, and because the water outlet module 3 is located on the first axial end of the second filter group 2, the water outlet module 3 extends in a direction away from the first axial end of the second filter group 2, and the water outlet module 3 is provided with a pure water outlet channel 321, the pure water outlet channel 321 and the first filter group 1 or the second filter group 2 are arranged one by one along the axial direction of the post-filtration device, realizing the separation of the pure water outlet channel 321 from the first filter group 1 and the second filter group 2, so that the pure water outlet channel 321 does not occupy the space between the first filter group 1 and the second filter group 2. At the same time, it improves the axial space utilization rate of the post-filtration device, reduces the radial dimension of the post-filtration device, and prevents the post-filtration device from occupying too much space in the radial direction, which is conducive to reducing the overall volume of the water purification equipment.

[0103] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of those different embodiments or examples.

[0104] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified.

[0105] The above are merely specific embodiments of this application, but the scope of protection of this application is not limited thereto. Any person skilled in the art can easily conceive of various variations or substitutions within the technical scope disclosed in this application, and these should all be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A post-filter device, characterized in that, include: The first filter group has a pure water flow channel; The second filter group is fitted onto the first filter group and is used to connect the first filter group and an external water supply device. A water outlet module is disposed on the first axial end of the second filter group and extends in a direction away from the first axial end of the second filter group. The water outlet module has a pure water outlet channel and the pure water outlet channel is connected to the pure water channel.

2. The post-filter device according to claim 1, characterized in that, The second filter assembly has a wastewater flow channel; The water outlet module also has a wastewater outlet channel, which is connected to the wastewater channel.

3. The post-filter device according to claim 2, characterized in that, The wastewater outlet channel is arranged around the pure water outlet channel.

4. The post-filter device according to claim 2, characterized in that, The water outlet module includes: An outer tube, wherein the outer tube is disposed on the axial first end of the second filter group, the outer tube extends in a direction away from the axial first end of the second filter group, and the outer tube has a mounting cavity; and An inner tube is inserted into the mounting cavity. The inner tube has a pure water outlet channel, and the outer wall of the inner tube and the side wall of the mounting cavity form the wastewater outlet channel.

5. The post-filter device according to claim 4, characterized in that, The sidewall of the mounting cavity is provided with multiple isolation protrusions, which are arranged around the axial center line of the mounting cavity and abut against the outer peripheral wall of the inner tube.

6. The post-filter device according to claim 1, characterized in that, The first filter group includes: A first filter element having a through hole extending along the axial direction of the first filter element; A support tube is provided in the through hole to support the first filter element. The support tube has a pure water flow channel that is connected to the first filter element. The first inner end cap is disposed on the first axial end of the support tube, and the first inner end cap abuts against the first axial end of the first filter element. A second inner end cap is disposed on the axial second end of the support tube, and the second inner end cap abuts against the axial second end of the first filter element; and A protective sleeve is fitted onto the outer peripheral wall of the first filter element. One end of the protective sleeve is connected to the first inner end cap, and the other end of the protective sleeve is connected to the second inner end cap. The protective sleeve has a second water outlet hole, which connects the first filter element and the second filter assembly.

7. The post-filter device according to claim 6, characterized in that, The protective sleeve has a first snap-fit ​​portion at its first axial end and a second snap-fit ​​portion at its second axial end. The first inner end cover is provided with a third snap-fit ​​portion, which is adapted to the first snap-fit ​​portion to connect the first inner end cover and the protective sleeve together; The second inner end cover is provided with a fourth snap-fit ​​portion, which is adapted to the second snap-fit ​​portion to connect the second inner end cover and the protective sleeve together.

8. The post-filter device according to claim 7, characterized in that, The first inner end cap has a mounting hole, which is connected to the pure water flow channel, and the axial first end of the water outlet module is inserted into the mounting hole; A first sealing element is provided between the outer peripheral wall of the first axial end of the water outlet module and the wall of the mounting hole, and the first sealing element is used to seal the gap between the water outlet module and the mounting hole.

9. The post-filter device according to claim 1, characterized in that, The second filter group includes: The second filter element is sleeved on the outer peripheral wall of the first filter assembly; A first outer end cap, which is sleeved on the axial first end of the second filter element and the axial first end of the first filter assembly; and The second outer end cap is sleeved on the second axial end of the second filter element and the second axial end of the first filter group.

10. A water purification device, characterized in that, Includes the post-filter device according to any one of claims 1-9.

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