Reverse osmosis filter element, composite filter element and water purifier with backwashing function

Abstract

The present invention discloses a reverse osmosis filter element, a composite filter element and a water purifier with a backwash function. When the water purifier starts working, raw water enters the primary filter chamber of the composite filter element and is filtered by the primary filter element to form purified water that enters the secondary filter chamber. The purified water is filtered by the reverse osmosis filter element to separate out pure water and concentrated water. A pure water outlet chamber is provided in the reverse osmosis filter element. The pure water fills the pure water outlet chamber and enters the pressure water storage chamber of the backwash pressure device to push the backwash component. When the water purifier stops working, the water inflow stops, and the backwash component resets under the action of elastic force to push out the pure water in the pressure water storage chamber to form a backwash water flow. The backwash water flows back into the concentrated water separation water path of the reverse osmosis filter element for flushing, and the concentrated water is completely discharged to prevent the concentrated water from remaining in the reverse osmosis filter element. Compared with the prior art, the water purifier of the present invention realizes the backwash function through the pure water in the reverse osmosis filter element, and there is no need to add other equipment to collect water from the outside for flushing, thereby saving water and greatly reducing costs.

Description

Technical Field

[0001] The present invention relates to the technical field of water purification, in particular to a water purifier using a composite filter element. Background Art

[0002] A water purifier is a water purification device that uses a multi-stage filter element to purify water. It removes impurities and certain elements in the water through physical methods such as filtration, adsorption, and reverse osmosis. In particular, the reverse osmosis membrane in the filter element can intercept organic pollutants and inorganic ions in the water, filtering out pure water for direct drinking.

[0003] While filtering out pure water, the reverse osmosis membrane also releases concentrated water with a high salt content. When the water purifier stops working, this concentrated water will remain in the reverse osmosis filter element. Over time, this concentrated water will penetrate into the pure water side of the reverse osmosis membrane, causing the TDS value of the pure water remaining in the water purifier to increase significantly. This concentrated water that remains for a long time is prone to scaling, which shortens the life of the reverse osmosis membrane. To solve this problem, conventional flushing and pure water backflow flushing solutions waste a lot of water and are also costly to implement. Summary of the Invention

[0004] In order to overcome the deficiencies of the prior art, the present invention provides a composite filter element having a reverse osmosis filter element with a backwashing function and a water purifier.

[0005] The technical solution adopted by the present invention to solve its technical problem is:

[0006] The filter element has a plurality of holes arranged on the sidewalls of the filter element, and the holes are connected to form a plurality of filter elements, and the filter element has a plurality of holes arranged on the sidewalls of the filter element. The filter element has a plurality of holes arranged on the sidewalls of the filter element. The filter element has a plurality of holes arranged on the sidewalls of the filter element. The interior of the filter element is a pure water outlet chamber, and the pure water filtered out by the reverse osmosis membrane enters the pure water outlet chamber through the water holes. A recoil pressure device is provided in the pure water outlet chamber, and the recoil pressure device includes a pressure water storage chamber and a recoil component elastically movable in the pressure water storage chamber. The pressure water storage chamber is connected to the pure water outlet chamber. Pure water enters the pressure water storage chamber and pushes the recoil component, so that the reverse osmosis membrane stops precipitating pure water. The recoil component is reset by elastic force to push the pure water in the pressure water storage chamber back into the pure water outlet chamber to form a recoil water flow, and the recoil water flow refluxes into the concentrated water precipitation water path of the reverse osmosis membrane.

[0007] The recoil pressure device further comprises a cylinder with one end open, the pressure water storage cavity is the inner cavity of the cylinder, and the recoil component is sealed and fitted with the side wall of the cylinder.

[0008] A spring is provided between the recoil piece and the bottom wall of the cylinder to enable the recoil piece to move elastically in the pressure water storage chamber.

[0009] An activated carbon filter element is provided in the pure water outlet cavity. The activated carbon filter element is tubular and a pure water outlet flow channel is formed inside the activated carbon filter element. An upper sealing cover is provided at the upper end of the activated carbon filter element. The upper sealing cover is provided with a pure water outlet nozzle connected to the pure water outlet flow channel. The bottom of the cylinder is provided as a lower sealing cover at the lower end of the activated carbon filter element. The upper sealing cover and the bottom of the cylinder form a filter element holder for the activated carbon filter element.

[0010] The bottom wall of the central cylinder is provided with a cross prism, the opening of the cylinder body abuts against the cross prism, and the empty space of the cross prism forms a water flow channel between the pressure water storage chamber and the pure water outlet chamber.

[0011] The water inlet flow channel is provided with a check device.

[0012] The check device includes a T-shaped silicone pad and a bracket mounted at the inlet of the filter membrane water inlet channel. The T-shaped silicone pad includes a silicone pad located inside the inlet of the water inlet channel and a plug-in column inserted on the bracket.

[0013] A water outlet pipe is provided in the central tube and passes through the concentrated water outlet nozzle. The water outlet pipe has a pure water channel and a concentrated water channel. The pure water outlet nozzle on the activated carbon filter element is sealed and plugged into the pure water channel. The concentrated water outlet nozzle of the reverse osmosis membrane is connected to the concentrated water channel.

[0014] A composite filter element comprises a shell, which is provided with a raw water inlet, a pure water outlet and a concentrated water outlet, and a primary filter chamber and a secondary filter chamber are defined therein by a partition, the partition is provided with a water inlet and a water outlet, a primary filter element is provided in the primary filter chamber, the primary filter element is cylindrical and divides the primary filter chamber into a raw water flow channel and a clean water flow channel, the outer side of the primary filter element is a raw water flow channel connected to the raw water inlet, and the inner side is a clean water flow channel connected to the secondary filter chamber through the water inlet on the partition, the above-mentioned reverse osmosis filter element is provided in the secondary filter chamber, the water inlet channel of the reverse osmosis filter element is connected to the secondary filter chamber, and the concentrated water outlet nozzle is sealed and plugged with the water outlet.

[0015] A water purifier is provided with the composite filter element mentioned above.

[0016] The beneficial effects of the present invention are as follows: when the water purifier starts working, the raw water enters the primary filter chamber of the composite filter element, is filtered by the primary filter element, and then forms clean water that enters the secondary filter chamber. The clean water is filtered by the reverse osmosis filter element to separate out pure water and concentrated water. A pure water outlet chamber is provided in the reverse osmosis filter element. The pure water fills the pure water outlet chamber and enters the pressure water storage chamber of the backwash pressure device to push the backwash part. When the water purifier stops working, the water inlet stops, and the backwash part resets under the action of elastic force to push out the pure water in the pressure water storage chamber to form a backwash water flow. The backwash water flow refluxes into the concentrated water separation water path of the reverse osmosis filter element for flushing, and the concentrated water is completely discharged to prevent the concentrated water from remaining in the reverse osmosis filter element. Compared with the prior art, the water purifier of the present invention realizes the backwash function through the pure water in the reverse osmosis filter element, and there is no need to add other equipment to receive water from the outside for flushing, which saves water and greatly reduces costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present invention will be further described below with reference to the accompanying drawings and examples.

[0018] Figure 1 It is a structural diagram of the composite filter element;

[0019] Figure 2 It is a schematic diagram of the disassembly of the composite filter element;

[0020] Figure 3 It is a cross-sectional view of the composite filter element;

[0021] Figure 4 It is a schematic diagram of the structure of the reverse osmosis filter element;

[0022] Figure 5 It is a structural diagram of the central tube;

[0023] Figure 6 This is a structural display diagram looking up at the bottom of the central tube;

[0024] Figure 7 This is a disassembled schematic diagram of the recoil pressure device. DETAILED DESCRIPTION

[0025] refer to Figures 1 to 2 A composite filter element, whose shell 1 is provided with a raw water inlet 101, a pure water outlet 102, and a concentrated water outlet 103, and its interior is divided into a primary filter chamber 12 and a secondary filter chamber 13 by a partition 11, and the partition 11 is provided with a water inlet 111 and a water outlet 112.

[0026] A primary filter element 2 is provided in the primary filter chamber 12. The primary filter element 2 is cylindrical and divides the primary filter chamber into a raw water flow channel and a clean water flow channel. The outer side of the primary filter element 2 is a raw water flow channel connected to the raw water inlet 101, and the inner side is a clean water flow channel connected to the secondary filter chamber 13 through the water inlet 111 on the partition.

[0027] A reverse osmosis filter element 3 is provided within the secondary filtration chamber 13. The reverse osmosis filter element 3 comprises a central tube 4, a reverse osmosis membrane 31 sleeved on the central tube 4, and upper and lower end caps 32 and 33 at both ends. The upper end cap 32 is provided with a concentrated water outlet nozzle 321, and the lower end cap 33 is provided with a water inlet channel 34 communicating with the secondary filtration chamber 13. The reverse osmosis filter element 3 is separated into a concentrated water outlet channel and a pure water outlet channel by the reverse osmosis membrane 31. The concentrated water outlet channel is connected to the concentrated water outlet nozzle 321 to discharge concentrated water, and is connected to the concentrated water outlet 103 through the water outlet 112 of the partition. The pure water outlet channel comprises a plurality of water holes 41 arranged on the sidewall of the central tube 4, and a pure water outlet chamber 5 within the central tube 4. Pure water filtered by the RO filter membrane of the reverse osmosis membrane 31 is passed into the pure water outlet chamber 5 through the water holes 41, and is also connected to the pure water outlet 102 through the water outlet 112 of the partition.

[0028] The composite filter element of the present invention has a backwash function, which flushes the concentrated water outflow channel to prevent concentrated water from remaining in the composite filter element. The backwash function is achieved by a backwash pressure device 6 provided in the pure water outlet chamber 5. Figures 3 to 7 As shown, the backwash pressure device 6 includes a pressure water storage chamber 61 and a backwash component 62 that moves elastically in the pressure water storage chamber 61 through a spring. The pressure water storage chamber 61 is connected to the pure water outlet chamber 5. When the pure water outlet chamber 5 is filled with pure water, the pure water will flow into the pressure water storage chamber 61 to push the backwash component 62. When the reverse osmosis membrane 31 stops precipitating pure water, the backwash component 62 is reset by elastic force to push the pure water in the pressure water storage chamber 61 back into the pure water outlet chamber 5 to form a backwash water flow. The backwash water flow refluxes into the concentrated water precipitation water path of the reverse osmosis membrane 31 for flushing, and the remaining concentrated water is discharged from the reverse osmosis membrane 31 through the concentrated water outlet nozzle 321. Since the backwash function is realized by the pure water in the reverse osmosis filter element, there is no need to take water from the outside for flushing, which greatly saves water.

[0029] The specific structure of the recoil pressure device 6 is as follows: it includes a cylinder 63 with one end open, whose inner cavity forms a pressure water storage chamber 61, and the recoil member 62 is an elastic floating body that seals and fits the side wall of the cylinder 63. A spring 64 is provided between it and the bottom wall of the cylinder 63 to realize the elastic movement of the recoil member 62 in the pressure water storage chamber 61. When pure water enters the pressure water storage chamber 61, it pushes the recoil member 62, causing the spring 64 to be compressed. After the water stops entering, the recoil member 62 is pushed by the rebound force of the spring 64 to discharge the pure water from the pressure water storage chamber 61.

[0030] Since the pure water precipitated through the RO filter membrane will have a peculiar smell that affects the taste of the water, an activated carbon filter element 7 is provided in the pure water outlet chamber 5. The pure water is filtered again by the activated carbon filter element 7, and the peculiar smell is removed or greatly reduced, thereby improving the taste of the water. The activated carbon filter element 7 is tubular and has a pure water outlet channel 71 formed inside it, which is installed and docked by a filter element bracket; the filter element bracket generally includes upper and lower sealing covers to ensure that the water will completely pass through the activated carbon filter material for filtration, and the upper sealing cover will be provided with a pure water outlet nozzle, and the pure water is discharged through the pure water outlet nozzle. In this embodiment, the activated carbon filter element 7 has an upper sealing cover 72, and the lower sealing cover is formed by the bottom of the cylinder 63 of the above-mentioned recoil pressure device 6, and constitutes a filter element bracket together with the upper sealing cover 72. According to the above structure, the recoil pressure device 6 is located below the activated carbon filter element 7 and flexibly utilizes its own components to become the filter element holder of the activated carbon filter element 7, making the structure within the central tube 4 more compact, thereby enabling the pressure water storage chamber 61 to be set larger and obtaining a larger recoil water flow when the recoil member 62 rebounds. When the recoil pressure device 6 is arranged in this way, the opening of its cylinder 63 faces the bottom wall of the central tube 4. To ensure that there is a sufficient water flow channel for pure water to enter the pressure water storage chamber 61, the bottom wall of the central tube 4 is provided with a cross prism 42. The opening of the cylinder 63 abuts against the cross prism 42, and the empty space of the cross prism 42 forms a water flow channel between the pressure water storage chamber 61 and the pure water outlet chamber 5.

[0031] Furthermore, in order to ensure that the backwash water flow is not dispersed and the concentrated water outlet water path is completely flushed, a check device 8 is provided at the water inlet channel 34 of the reverse osmosis filter element 3. When the backwash water flow is discharged from the pure water outlet chamber, the check device 8 prevents the backwash water from flowing through the water inlet channel 34 to discharge the activated carbon filter element, and can only flush the concentrated water outlet water path and discharge it through the concentrated water outlet nozzle 321. The check device 8 includes a T-shaped silicone pad 81 and a bracket 82 mounted at the inlet of the water inlet channel 34. The T-shaped silicone pad 81 includes a silicone pad 811 and a plug-in column 812. The bracket 82 is provided with an insertion hole. The T-shaped silicone pad 81 is inserted into the bracket 82 through the plug-in column 812, and the silicone pad 811 is located inside the inlet of the water inlet channel 34. When the backwash water flow refluxes, the backwash water presses the silicone pad 811 so that the silicone pad 811 is tightly attached to the inner side of the inlet of the filter membrane water inlet channel 34 to seal it.

[0032] In addition, to facilitate water discharge from the reverse osmosis filter element 3, a water outlet pipe 9 is provided. This water outlet pipe 9 has a pure water channel 91 and a concentrated water channel 92, which are connected to the pure water outlet and concentrated water outlet on the housing 1, respectively. One end of the water outlet pipe 9 is located within the central tube 4, with the pure water channel 91 sealingly connected to the pure water outlet nozzle 721. The other end of the water outlet pipe 9 extends through the concentrated water outlet nozzle 321. When the concentrated water outlet nozzle 321 of the reverse osmosis filter element 3 and the water outlet pipe 9 are sealedly connected to the water outlet 112 of the partition 11, a through hole is formed in the side wall of the water outlet pipe 9, connecting the concentrated water channel 92 to the concentrated water outlet nozzle 321. This structural arrangement of the water outlet pipe ensures stable water discharge from the reverse osmosis filter element 3.

[0033] The water purifier of the present invention is equipped with the composite filter cartridge of the present invention. The structure of the water purifier is well known to those skilled in the art and will not be described in detail here. With the composite filter cartridge of the present invention, the TDS value of the purified water is maintained at a very low level each time the water is started, ensuring that it does not affect drinking quality. This also eliminates the need for additional equipment components, significantly reducing manufacturing costs.

Claims

1. A reverse osmosis filter element with a backwashing function, comprising a central tube (4), a reverse osmosis membrane (31) sleeved on the central tube (4), and an upper end cover (32) and a lower end cover (33) located at both ends, wherein the upper end cover (32) is provided with a concentrated water outlet nozzle (321), and the lower end cover (33) is provided with a water inlet channel (34), a plurality of water holes (41) are arranged on the side wall of the central tube (4), and the interior of the central tube (4) is a pure water outlet cavity (5), and pure water filtered out by the reverse osmosis membrane (31) is passed into the pure water outlet cavity (5) through the water holes (41); characterized in that: A recoil pressure device (6) is provided in the pure water outlet chamber (5), and the recoil pressure device (6) includes a pressure water storage chamber (61) and a recoil component (62) elastically movable in the pressure water storage chamber (61). The pressure water storage chamber (61) is connected to the pure water outlet chamber (5). Pure water enters the pressure water storage chamber (61) and pushes the recoil component (62), and the reverse osmosis membrane (31) stops separating out pure water. The recoil component (62) is reset by elastic force to push the pure water in the pressure water storage chamber (61) back into the pure water outlet chamber (5) to form a recoil water flow. The recoil water flow refluxes and flows into the concentrated water separation water path of the reverse osmosis membrane (31); the recoil pressure device (6) also includes a cylinder (63) with one end open, and the pressure water storage chamber (61) is the inner cavity of the cylinder (63). The recoil member (62) is sealed against the side wall of the cylinder (63); a spring (64) is provided between the recoil member (62) and the bottom wall of the cylinder (63) to realize the elastic movement of the recoil member (62) in the pressure water storage chamber (61); an activated carbon filter element (7) is provided in the pure water outlet chamber (5); the activated carbon filter element (7) is tubular and a pure water outlet flow channel (71) is formed therein; an upper sealing cover (72) is provided at the upper end of the activated carbon filter element (7); a pure water outlet nozzle (721) connected to the pure water outlet flow channel (71) is provided on the upper sealing cover (72); the bottom of the cylinder (63) is provided as a lower sealing cover at the lower end of the activated carbon filter element (7); the upper sealing cover (72) and the bottom of the cylinder (63) form a filter element holder for the activated carbon filter element (7); The water inlet channel (34) is provided with a check device (8).

2. The reverse osmosis filter element according to claim 1, characterized in that: The bottom wall of the central cylinder (4) is provided with a cross prism (42), the opening of the cylinder (63) abuts against the cross prism (42), and the empty space of the cross prism (42) forms a water flow channel between the pressure water storage chamber (61) and the pure water outlet chamber (5).

3. The reverse osmosis filter element according to claim 1, characterized in that: The check device (8) comprises a T-shaped silica gel pad (81) and a bracket (82) mounted at the inlet of the filter membrane water inlet channel (34); the T-shaped silica gel pad (81) comprises a silica gel pad (811) located inside the inlet of the water inlet channel (34) and a plug-in column (812) plugged into the bracket (82).

4. The reverse osmosis filter element according to claim 1, characterized in that: A water outlet pipe (9) is provided in the central tube (4) and extends out from the concentrated water outlet nozzle (321). The water outlet pipe (9) has a pure water channel (91) and a concentrated water channel (92). The pure water outlet nozzle (721) on the activated carbon filter element (7) is sealed and plugged into the pure water channel (91). The concentrated water outlet nozzle (321) of the reverse osmosis membrane (31) is connected to the concentrated water channel (92).

5. A composite filter element, comprising a shell (1), wherein the shell (1) is provided with a raw water inlet (101), a pure water outlet (102), and a concentrated water outlet (103), and a primary filter chamber (12) and a secondary filter chamber (13) are defined therein by a partition (11), wherein the partition (11) is provided with a water inlet (111) and a water outlet (112), wherein a primary filter element (2) is provided in the primary filter chamber (12), wherein the primary filter element (2) is cylindrical and divides the primary filter chamber into a raw water flow channel and a purified water flow channel, wherein the outer side of the primary filter element (2) is a raw water flow channel connected to the raw water inlet, and the inner side is a purified water flow channel connected to the secondary filter chamber through the water inlet (111) on the partition, and wherein: The secondary filtration chamber (13) is provided with a reverse osmosis filter element as described in any one of claims 1 to 4, the water inlet channel (34) of the reverse osmosis filter element (3) is connected to the secondary filtration chamber (13), and the concentrated water outlet nozzle (321) is sealed and plugged with the water outlet (112).

6. A water purifier, characterized in that: The composite filter element according to claim 5 is provided in the water purifier.

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