Composite filter element and water purifying device

Abstract

The utility model discloses a composite filter element and a water purifying device, the composite filter element comprises a first filter element which comprises a first filter shell and a first filter material; the second filter element comprises a second filter shell and a second filter material, and the second filter element is detachably connected to the first filter element; the first filter element is provided with a first end and a second end along the axial direction, the first end is connected with a filter bottle cap, the filter bottle cap is at least provided with a raw water inlet and a wastewater outlet, and the second end is provided with a pure water outlet; the second filter element is provided with a first end and a second end along the axial direction, the first end is provided with a water inlet which is communicated with the pure water outlet, and the second end is provided with a pure water outlet; and the second end of the first filter element and the first end of the second filter element are provided with a connecting mechanism for mutual connection. The two filter elements of the composite filter element are detachably connected with each other, a user can independently replace one filter element, the element replacement cost is reduced, and the composite filter element is very convenient to mount and dismount.

Description

A composite filter element and water purification device Technical Field

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

[0002] Existing water purifiers typically use multi-stage filter cartridges for water purification. To reduce the size of the water purifier, these multi-stage filter cartridges are integrated into a single composite filter cartridge. However, the lifespan of each filter cartridge is inconsistent. The lifespan of pre-treatment and post-treatment filter cartridges is generally shorter than that of reverse osmosis or nanofiltration membrane cartridges. Therefore, when a pre-treatment or post-treatment filter cartridge reaches the end of its lifespan and needs replacement, the user has to replace the entire composite filter cartridge. This results in the reverse osmosis or nanofiltration membrane cartridge, which is the core treatment unit, not being fully utilized, leading to waste. In addition, frequent cartridge replacements increase operating costs and negatively impact the user experience. Summary of the Invention

[0003] To address the problems of existing technologies, this utility model aims to propose a composite filter element and a water purification device. Each filter element of the composite filter element can be replaced individually, thereby making full use of each filter element, and the installation and disassembly are very convenient.

[0004] To achieve the above objectives, the composite filter element proposed in this utility model includes a first filter element, comprising a first filter housing and a first filter material disposed within the first filter housing; and a second filter element, comprising a second filter housing and a second filter material disposed within the second filter housing, wherein the second filter element is detachably connected to the first filter element; the first filter element has a first end and a second end along its axial direction, the first end being connected to a filter bottle cap, the filter bottle cap having at least a raw water inlet and a wastewater outlet, and the second end having a pure water outlet; the second filter element has a first end and a second end along its axial direction, the first end having an inlet connected to the pure water outlet, and the second end having a clean water outlet; and the second end of the first filter element and the first end of the second filter element are provided with a connecting mechanism for mutual connection.

[0005] In one embodiment, the first filter element further includes a central tube, a first end cap, and a second end cap. The first filter material is wound around the central tube, and the first end cap and the second end cap are respectively installed at both ends of the first filter material. The lower end of the central tube is connected to the pure water outlet.

[0006] In one embodiment, a raw water inlet channel or a flushing water receiving cavity is formed between the outer side of the first filter material and the inner wall of the first filter shell.

[0007] In one embodiment, the end of the first filter material near the filter bottle cap is the wastewater end, which is connected to the wastewater outlet.

[0008] In one embodiment, the center of the second filter material is a water inlet channel, which is connected to the water inlet.

[0009] In one embodiment, a clean water flow channel is formed between the outer side of the second filter material and the inner wall of the second filter housing, and the clean water flow channel is connected to the clean water outlet.

[0010] In one embodiment, the filter bottle cap is also provided with a pure water return port, so that pure water filtered by the first filter material can flow out of the first filter element for rinsing the first filter material.

[0011] In one implementation, the upper end of the central tube is connected to the pure water return port.

[0012] In one embodiment, the connecting mechanism includes an external thread formed at the second end of the first filter element and an internal thread formed at the first end of the second filter element.

[0013] This utility model also proposes a water purification device, which includes the above-mentioned composite filter element.

[0014] Beneficial effects:

[0015] (1) The first and second filter elements of the composite filter element of this utility model are arranged in a coaxial series arrangement and are connected to each other in a detachable manner, so that users can replace one of the filter elements without replacing the entire composite filter element, thereby making full use of the filter material, avoiding unnecessary waste, and saving users the cost of replacing the filter element.

[0016] (2) The first filter element and the second filter element are connected by a connecting mechanism designed on the filter shell, which makes installation and disassembly very convenient. Furthermore, the part connecting the first filter element and the second filter element adopts a shape-matching structural design, so that the composite filter element formed after connection has good integrity.

[0017] (3) A pure water return port is provided on the filter bottle cap of the composite filter element, which enables it to rinse the first filter material. Furthermore, the return pure water used for rinsing is only produced by the first filter element and does not pass through the second filter element, thereby saving the processing capacity of the second filter element and giving the second filter element a longer service life. Attached Figure Description

[0018] The present invention will be further described and explained below with reference to the accompanying drawings.

[0019] Figure 1 is a schematic diagram of the composite filter element of the preferred embodiment of this utility model.

[0020] Figure 2 is an exploded view of the composite filter element in Figure 1.

[0021] Figure 3 is a longitudinal sectional view of the first filter element in the composite filter element in Figure 1.

[0022] Figure 4 is a longitudinal sectional view of the second filter element in the composite filter element in Figure 1.

[0023] Figure 5 is a longitudinal sectional view of the composite filter element in Figure 1.

[0024] Figure 6 is a schematic diagram of the water purification device of this utility model.

[0025] Figure label:

[0026] 100 Composite filter element; 1 First filter element; 1a First end of the first filter element; 1b Second end of the first filter element; 2 Second filter element; 2a First end of the second filter element; 2b Second end of the second filter element; 3 Connecting mechanism; 10 First filter housing; 10a Raw water inlet; 10b Wastewater outlet; 10c Pure water outlet; 10d Pure water return outlet; 11 First filter media; 12 Filter bottle cap; 13 Central tube; 14 First end cap; 15 Second end cap; 16 Raw water inlet channel or flushing water receiving cavity ; 17 Wastewater end; 18 Seal; 20 Second filter housing; 20a Inlet; 20b Clean water outlet; 21 Second filter media; 31 External thread; 32 Internal thread; 50 Inlet valve; 60 Pre-filter element; 70 Booster pump; 80 Outlet solenoid valve; 90 Pure water return path; 91 Check valve; 110 Filter housing neck; 150 End cap neck; 201 Upper shell; 202 Lower shell; 203 Recess; 204 Rib; 205 Connecting seat; 211 Inlet channel; 212 Clean water channel. Detailed Implementation

[0027] The technical solution of this utility model will be more clearly and completely explained below with reference to the accompanying drawings and through the description of the preferred embodiments of this utility model.

[0028] As shown in Figures 1 and 2, in the preferred embodiment, the composite filter element 100 includes a first filter element 1 and a second filter element 2, with the second filter element 2 detachably connected to the first filter element 1. In this invention, the first filter element 1 and the second filter element 2 are two relatively independent parts. They can be connected as one unit along their axial direction by a connecting mechanism to form the composite filter element 100, or they can be separated into two independent parts for easy replacement of one of the filter elements.

[0029] As shown in Figures 1 to 3, the first filter element 1 includes a first filter housing 10 and a first filter material 11 disposed within the first filter housing. The first filter element 1 has a first end 1a and a second end 1b along its axial direction. The first end 1a is connected to a filter bottle cap 12, which has at least a raw water inlet 10a and a wastewater outlet 10b. The second end 1b has a pure water outlet 10c. The raw water inlet 10a is connected to an external water source, allowing raw water to enter the first filter element 1. The wastewater outlet 10b allows wastewater generated after the raw water is filtered by the first filter material 11 to be discharged from the first filter element 1. The pure water outlet 10c allows pure water formed after the raw water is filtered by the first filter material 11 to be discharged from the first filter element 1.

[0030] The first filter element 1 also includes a central tube 13, a first end cap 14, and a second end cap 15. A first filter material 11 is wound around the central tube 13, and the first end cap 14 and the second end cap 15 are respectively installed at both ends of the first filter material 11. A hole is opened in the wall of the central tube 13, and the lower end of the central tube 13 is connected to the pure water outlet 10c. A raw water inlet channel 16 is formed between the outer side of the first filter material 11 and the inner wall of the first filter housing 10. The inner side of the first filter material 11 is the pure water outlet side, and the end of the first filter material 11 near the filter bottle cap 12 is the wastewater end 17, which is connected to the wastewater outlet 10b. Raw water enters the raw water inlet channel 16 from the raw water inlet 10a, is filtered by the first filter material 11, and forms pure water on the pure water outlet side. The pure water enters the central tube through the hole in the wall of the central tube 13, flows to the lower end of the central tube, and then flows out of the first filter element 1 through the pure water outlet 10c. The wastewater generated during the filtration process flows to the wastewater end 17 and through the hole on the first end cap 14 to the wastewater outlet 10b, and is then discharged from the wastewater outlet 10b.

[0031] The "raw water" here includes water that has undergone primary filtration. In this invention, the first filter material is preferably a reverse osmosis membrane or a nanofiltration membrane.

[0032] As shown in Figures 1 to 4, the second filter element 2 includes a second filter housing 20 and a second filter material 21 disposed within the second filter housing. The second filter element 21 has a first end 2a and a second end 2b along its axial direction. The first end 2a is provided with a water inlet 20a, which is connected to a pure water outlet 10c, so that pure water filtered by the first filter material 11 can enter the second filter element 2 through the pure water outlet 10c and the water inlet 20a. The second end 2b is provided with a clean water outlet 20b, so that clean water filtered by the second filter material 21 can be discharged from the second filter element 2 through the clean water outlet 20b, that is, discharged from the composite filter element 100 for user use.

[0033] The center of the second filter material 21 is a water inlet channel 210, which is connected to the water inlet 20a, allowing pure water entering from the water inlet 20a to enter the water inlet channel 211. A purified water channel 212 is formed between the outer side of the second filter material 21 and the inner wall of the second filter shell 20, which is connected to the purified water outlet 20b, allowing purified water filtered by the second filter material 21 to flow out from the purified water outlet 20b.

[0034] In this invention, the second filter material 21 is preferably made of activated carbon, such as granular activated carbon, sintered activated carbon rods or activated carbon fiber rods, or a composite of the aforementioned materials.

[0035] As shown in Figures 1 to 5, the second end 1b of the first filter element 1 and the first end 2a of the second filter element 2 are provided with a connecting mechanism 3 for interconnection. This connecting mechanism 3 allows the first filter element 1 and the second filter element 2 to be detachably connected. In the illustrated embodiment, the connecting mechanism 3 includes an external thread 31 formed on the second end 1b of the first filter element 1 and an internal thread 32 formed on the first end 2a of the second filter element 2. When the external thread 31 and the internal thread 32 are tightened, the second filter element 2 and the first filter element 1 are interconnected to form a composite filter element 100.

[0036] Specifically, the first filter housing 10 forms a filter housing neck 110 at the second end 1b of the first filter element. The hollow portion inside the filter housing neck 110 forms a pure water outlet 10c. An external thread 31 is formed on the outer surface of the filter housing neck 110, that is, around the pure water outlet 10c. The second end cap 15 is located inside the second end 1b of the first filter element. Its central portion forms an end cap neck 150. The outer diameter of the end cap neck 150 is smaller than that of the filter housing neck 110, and the inner diameter of the end cap neck 150 is basically equal to the inner diameter of the pure water outlet 10c. In the assembled state, the end cap neck 150 extends into the filter housing neck 110. Their hollow internal portions are connected to the lower end of the central tube 13, together forming a water outlet channel from the lower end of the central tube 13 to the pure water outlet 10c. The water outlet channel is also equipped with a seal 18, which extends from the end cap neck 150 to the filter housing neck 110, providing a seal for the entire water outlet channel. This seal isolates the raw water inlet channel 16 from the pure water outlet 10c, preventing cross-contamination between the raw water and pure water. In other alternative embodiments, the seal 18 may also be designed as an integral part of the filter housing neck 110 and / or the end cap neck 150.

[0037] The second filter housing 20 consists of an upper housing portion 201 and a lower housing portion 202. The upper housing portion 201 has a connection structure for connecting with the first filter element 1. More specifically, a recess 203 is formed at the top of the upper housing portion 201 to accommodate the bottom of the first filter housing 10. To better match the bottom of the first filter housing 10, radially distributed ribs 204 are provided within the recess 203. The ribs 204 extend from the inner side of the circumferential wall of the upper housing portion 201 to the center portion of the recess 203. Furthermore, along the direction from the circumferential wall of the upper housing portion 201 to the center portion of the recess 203, the height of the ribs 204 gradually decreases. Near the circumferential wall, the ribs... The upper surface of strip 204 is a downward-sloping arc shape, which is used to match the arc shape around the bottom of the first filter housing 10. This design ensures that after the first filter element 1 and the second filter element 2 are connected, the bottom of the first filter housing 10 is located in the recess 203 of the upper shell portion 201 of the second filter housing, and the arc portion around the bottom of the first filter housing 10 is surrounded by the circumferential wall of the upper shell portion 201, thereby forming a perfect shape match between the first filter housing 10 and the second filter housing 20, and improving the integrity of the composite filter element 100.

[0038] The central portion of the recess 203 in the upper shell 201 of the second filter housing has a downwardly extending connecting seat 205. An inlet 20a is formed at the center of the connecting seat 205, and an internal thread 32 is provided on the wall of the inlet 20a. In the assembled state, the filter housing neck 110 extends into the inlet 20a, and the lower end of the sealing member 18 abuts against the bottom of the inlet 20a. The external thread 31 on the outer peripheral wall of the filter housing neck 110 engages with the internal thread 32 on the inner wall of the inlet 20a, thereby connecting the first filter element 1 and the second filter element 2 together. Pure water filtered by the first filter element 1 can flow from the lower end of the central tube 13 through the outlet channel within the sealing member 18 to the inlet 20a, and then enter the second filter material 21 for the next stage of filtration.

[0039] Based on the above embodiments, the connection and disassembly of the first filter element 1 and the second filter element 2 of the composite filter element 100 of this utility model are very convenient. When one of the filter elements needs to be replaced, the user only needs to separate the two filter elements, replace the filter element that needs to be replaced with the new filter element, and connect it with the filter element that does not need to be replaced. In this way, the replacement of the filter element is simple and convenient, and the problem of different service lives of the filter elements is also taken into account, so that the filter element can be fully utilized.

[0040] Of course, the connecting mechanism 3 of this utility model is not limited to the method shown in the figure. In other optional embodiments, the positions of the internal and external threads can be interchanged, or other existing detachable connecting methods in the art, such as snap-fit ​​connection and quick-clamp connection, can also be used.

[0041] In a preferred embodiment, the filter cap 12 is further provided with a pure water return port 10d. One end (i.e., the upper end) of the central tube 13 is connected to the pure water return port 10d, and the other end (i.e., the lower end) is connected to the pure water outlet 10c. The pure water return port 10d allows pure water filtered by the first filter material 11 to flow out from the pure water return port for rinsing the first filter material 11. When preparing pure water for rinsing the first filter material, the raw water inlet channel 16 acts as a rinsing water receiving chamber.

[0042] As shown in Figure 6, this utility model also proposes a water purification device, which includes the aforementioned composite filter element 100, as well as an inlet solenoid valve 50, a pre-filter element 60, a booster pump 70, an outlet solenoid valve 80, and a pure water return path 90. The tap water source is connected to the pre-filter element 60 via the inlet solenoid valve 50. The booster pump 70 is connected between the outlet of the pre-filter element 60 and the raw water inlet 10a of the composite filter element 100. The outlet solenoid valve 80 is connected to the outlet path of the purified water outlet 20b of the composite filter element 100. The pure water return path 90 is connected between the pure water return port 10d of the composite filter element 100 and the inlet of the booster pump 70. A check valve 91 is installed on the pure water return path 90, ensuring that water can only flow from the pure water return port 10d to the inlet of the booster pump 70 and cannot flow in the opposite direction.

[0043] During normal water production, the water purification device opens the inlet solenoid valve 50, the booster pump 70, and the outlet solenoid valve 80. Tap water, after being filtered by the pre-filter 60, enters the composite filter 100 under the pressure of the booster pump 70. After two stages of filtration by the first filter 1 and the second filter 2, purified water is produced and discharged from the purified water outlet 20b of the composite filter 100, flowing out through the outlet solenoid valve 80 for user use. In this state, the outlet of the check valve 91 is at the tap water pressure, while the inlet pure water pressure is close to 0, thus the check valve 91 is closed.

[0044] When the water purification device produces flushing water, the inlet solenoid valve 50 and the booster pump 70 are opened, while the outlet solenoid valve 80 is closed. The outlet of the check valve 91 is at the tap water pressure, while the inlet is at the pure water pressure. When the check valve 91 is open, the tap water, after being filtered by the pre-filter 60, enters the composite filter 100 under the pressure of the booster pump 70. After being filtered by the first filter 1, pure water is formed. This pure water flows out of the first filter 1 from the pure water return port 10d and enters the pure water return path 90. Then it flows to the inlet of the booster pump 70, where it mixes with the tap water to form a mixed water with a lower TDS value. Under the pressure of the booster pump 70, it enters the flushing water receiving chamber 16 of the first filter 1. After being filtered by the first filter material 11, the resulting wastewater is discharged from the wastewater end, thereby flushing away the tap water and part of the wastewater from the first filter material 11 in the flushing water receiving chamber 16.

[0045] When the water purification device rinses the first filter media, the inlet solenoid valve 50 is opened, and the booster pump 70 and the outlet solenoid valve 80 are closed. After being filtered by the pre-filter cartridge 60, tap water enters the composite filter cartridge 100, pushing the mixed water with a lower TDS value in the rinsing water receiving chamber 16 towards the wastewater end of the first filter media 11, thereby flushing away the remaining wastewater in the first filter media 11 and achieving the rinsing of the first filter media 11.

[0046] The composite filter element 100 of this utility model has a pure water return port 10d, which enables it to rinse the first filter material 11. Furthermore, the returned pure water does not pass through the second filter material 21, thus saving the processing capacity of the second filter material 21 and making the service life of the second filter material longer.

[0047] The above-described specific embodiments are merely preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Various modifications, substitutions, and improvements made by those skilled in the art to the technical solutions of the present invention based on the provided description and drawings, without departing from the design concept and spirit of the present invention, should all fall within the scope of protection of the present invention. The scope of protection of the present invention is determined by the claims.

Claims

1. A composite filter element, characterized in that, include: The first filter element includes a first filter housing and a first filter material disposed within the first filter housing; The second filter element includes a second filter housing and a second filter material disposed within the second filter housing. The second filter element is detachably connected to the first filter element. The first filter element has a first end and a second end along its axial direction. The first end is connected to a filter bottle cap, which has at least a raw water inlet and a wastewater outlet. The second end has a pure water outlet. The second filter element has a first end and a second end along its axial direction. The first end has an inlet that communicates with the pure water outlet. The second end has a clean water outlet. The second end of the first filter element and the first end of the second filter element are provided with a connecting mechanism for mutual connection. The bottom of the first filter housing of the first filter element is arc-shaped, and the top of the second filter housing of the second filter element forms a recess. The recess has radially distributed ribs, and the upper surface of the ribs is an arc shape that matches the arc shape of the bottom of the first filter housing.

2. The composite filter element as described in claim 1, characterized in that, The first filter element further includes a central tube, a first end cap, and a second end cap. The first filter material is wound around the central tube, and the first end cap and the second end cap are respectively installed at both ends of the first filter material. The lower end of the central tube is connected to the pure water outlet.

3. The composite filter element as described in claim 2, characterized in that, A raw water inlet channel or a flushing water receiving cavity is formed between the outer side of the first filter material and the inner wall of the first filter shell.

4. The composite filter element as described in claim 3, characterized in that, The end of the first filter material near the filter bottle cap is the wastewater end, and the wastewater end is connected to the wastewater outlet.

5. The composite filter element as described in claim 4, characterized in that, The center of the second filter material is a water inlet channel, which is connected to the water inlet.

6. The composite filter element as described in claim 5, characterized in that, A water purification channel is formed between the outer side of the second filter material and the inner wall of the second filter shell, and the water purification channel is connected to the water purification outlet.

7. The composite filter element as described in claim 2, characterized in that, The filter bottle cap is also provided with a pure water return port, so that the pure water filtered by the first filter material can flow out of the first filter element for rinsing the first filter material.

8. The composite filter element as described in claim 7, characterized in that, The upper end of the central tube is connected to the pure water return port.

9. The composite filter element as described in claim 1, characterized in that, The connecting mechanism includes an external thread formed at the second end of the first filter element and an internal thread formed at the first end of the second filter element.

10. A water purification device, characterized in that, Includes the composite filter element as described in any one of claims 1 to 9.

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