Water purifier with electrodialysis function and water purification system

Abstract

The invention relates to the technical field of water purification, in particular to a water purifier with an electrodialysis function and a water purification system. The water purifier comprises an electrodialysis water purification filter element, a drinking water pipeline and a membrane filter element, the electrodialysis water purification filter element comprises a cathode, an anode and an ion exchange module, and the ion exchange module is arranged between the cathode and the anode; a divalent cation chamber and a monovalent cation chamber are formed in the ion exchange module, the water inlet ends of the divalent cation chamber and the monovalent cation chamber are connected with a pure water port of the membrane filter element, and the water outlet end of the divalent cation chamber is connected with the drinking water pipeline; under the action of an electric field of the anode and the cathode, monovalent cations in the divalent cation chamber are migrated to the monovalent cation chamber, and divalent cations in the divalent cation chamber are retained. Monovalent cations in the divalent cation chamber are moved forwards to the monovalent cation chamber, so that the monovalent cations and the divalent cations in the water are separated, and the water quality is changed.

Description

Technical Field

[0001] The present invention relates to the technical field of water purification, and in particular to a water purifier and a water purification system with an electrodialysis function. Background Art

[0002] As people's living standards improve, they pay more and more attention to water quality and hygiene, and it has become a trend to equip families with water purification equipment; existing water purification equipment can easily produce pure water for drinking, but the water quality is relatively simple. In addition, the human body needs to contain a certain amount of minerals such as calcium and magnesium, but the water purifiers on the market generally have extremely low calcium and magnesium ion content and relatively high monovalent sodium ion content. Generally speaking, calcium and magnesium ions are needed by the human body, but not too much in drinking water, otherwise the problem of water scale will be serious. High-quality drinking water should have a low sodium ion content. Summary of the invention

[0003] In view of the deficiencies in the prior art, the present invention proposes a water purifier and a water purification system with electrodialysis function, aiming to solve the problem that the existing water purifiers generally have extremely low calcium and magnesium ion contents and relatively high monovalent sodium ion contents.

[0004] The technical solution proposed by the present invention is:

[0005] A water purifier with electrodialysis function, the water purifier comprises an electrodialysis water purification filter element, a drinking water pipeline and a membrane filter element, the electrodialysis water purification filter element comprises a cathode, an anode and an ion exchange module, the ion exchange module is placed between the cathode and the anode;

[0006] A divalent cation chamber and a monovalent cation chamber are formed in the ion exchange module, the water inlet ends of the divalent cation chamber and the monovalent cation chamber are connected to the pure water outlet of the membrane filter element, and the water outlet end of the divalent cation chamber is connected to the drinking water pipeline;

[0007] Under the action of the electric field between the anode and the cathode, the monovalent cations in the divalent cation chamber migrate to the monovalent cation chamber, and the divalent cations in the divalent cation chamber are retained.

[0008] Furthermore, the electrodialysis water purification filter element comprises a central tube, a shell, an upper end cover and a lower end cover, and the central tube, the upper end cover and the lower end cover are all located in the shell;

[0009] One end of the upper end cover is connected to the upper end of the shell, and the other end cover is arranged at the upper end of the ion exchange module. The upper end cover and the upper end of the ion exchange module form a water inlet channel. The shell is provided with a third interface, and the third interface is communicated with the water inlet channel.

[0010] The central tube is connected to the upper end of the shell, the central tube has an inner flow channel and an outer flow channel, the upper end of the shell is provided with a second interface and a first interface, the second interface is communicated with the inner flow channel, and the first interface is communicated with the outer flow channel;

[0011] The ion exchange module is arranged around the outer tube wall of the central tube, the cathode is arranged between the inner side wall of the ion exchange module and the outer tube wall of the central tube, the cathode and the inner side wall of the ion exchange module form a cathode water chamber, and the cathode water chamber is communicated with the outer flow channel;

[0012] The anode is arranged on the inner side wall of the shell, and the anode and the outer side wall of the ion exchange module form an anode water chamber;

[0013] The lower end cover is arranged at the lower end of the ion exchange module, and the lower end cover and the lower end of the ion exchange module form a water production channel, and the water production channel is respectively connected with the divalent cation chamber and the inner flow channel, and the lower end cover is provided with a communication port, and the communication port is respectively connected with the outer flow channel and the anode water chamber;

[0014] The water inlet channel is communicated with the divalent cation chamber and the monovalent cation chamber respectively. The monovalent cation chamber is provided with at least two openings, at least one of the openings is communicated with the cathode water chamber, and at least another opening is communicated with the anode water chamber.

[0015] Furthermore, the ion exchange module includes a first grid, a selectively permeable cation membrane, a second grid and an anion membrane, wherein the first grid, the selectively permeable cation membrane, the second grid and the anion membrane are stacked in sequence from the inside to the outside and spirally wound so that the first grid is stacked on the anion membrane, wherein the selectively permeable cation membrane is a cation membrane that allows monovalent cations to pass through and retains divalent and higher cations.

[0016] Furthermore, the anion membrane and the selectively permeable cation membrane are sealed and connected at one end close to the central tube.

[0017] Furthermore, the divalent cation chamber is composed of the selectively permeable cation membrane and the anion membrane, and the second grid is arranged in the divalent cation chamber.

[0018] Furthermore, the end of the divalent cation chamber away from the central tube is sealed with a rubber wire, and the end of the divalent cation chamber close to the water production channel is not sealed with a rubber wire to form a first channel opening connected to the water production channel.

[0019] Furthermore, the monovalent cation chamber is composed of the selectively permeable cation membrane and the anion membrane, and the first grid is arranged in the monovalent cation chamber.

[0020] Furthermore, the end of the monovalent cation chamber away from the central tube is sealed with an intermittent glue line, at least two of the openings are formed by the discontinuity of the intermittent glue line, and the end of the divalent cation chamber close to the water production channel is sealed with a glue line.

[0021] Furthermore, the cathode water chamber is formed by the selectively permeable cation membrane, the cathode and the first grid.

[0022] Furthermore, the anode water chamber is formed between the cathodic membrane and the anode.

[0023] Furthermore, the electrodialysis water purification filter element includes an anode wire and a cathode wire, one end of the anode wire is connected to the anode, and the other end passes through the shell for connection to the positive pole of the power supply, and one end of the cathode wire is connected to the cathode, and the other end passes through the shell for connection to the negative pole of the power supply.

[0024] Furthermore, the water purifier includes a wastewater pipeline, which includes a first wastewater pipeline, a second wastewater pipeline and a check valve, the first wastewater pipeline is connected to the wastewater port of the membrane filter element, the first end of the second wastewater pipeline is connected to the wastewater port of the monovalent cation chamber, the second end of the second wastewater pipeline is connected to the branch port of the first wastewater pipeline, and the check valve is arranged on the second wastewater pipeline.

[0025] Furthermore, the wastewater pipeline includes an extreme water pipe, one end of which is connected to the water outlets of the anode water chamber and the cathode water chamber respectively, and the other end is connected to the branch port of the second wastewater pipe, and the branch port of the second wastewater pipe is located between the first end of the second wastewater pipe and the check valve.

[0026] Furthermore, the wastewater pipeline includes a first flow limiting device and a second flow limiting device, the first flow limiting device is arranged in the extreme water pipeline, the second flow limiting device is arranged in the second wastewater pipeline, and the second flow limiting device is located between the branch port of the second wastewater pipeline and the first end of the second wastewater pipeline.

[0027] Furthermore, the water purifier includes a water inlet pipeline, which includes a water inlet pipe and a boosting device. The water inlet pipe is connected to the water inlet of the membrane filter element, and the boosting device is arranged on the water inlet pipe.

[0028] The present invention also provides a water purification system, comprising a water purifier with an electrodialysis function, the water purifier comprising an electrodialysis water purification filter element, a drinking water pipeline and a membrane filter element, the electrodialysis water purification filter element comprising a cathode, an anode and an ion exchange module, the ion exchange module being placed between the cathode and the anode;

[0029] A divalent cation chamber and a monovalent cation chamber are formed in the ion exchange module, the water inlet ends of the divalent cation chamber and the monovalent cation chamber are connected to the pure water outlet of the membrane filter element, and the water outlet end of the divalent cation chamber is connected to the drinking water pipeline;

[0030] Under the action of the electric field between the anode and the cathode, the monovalent cations in the divalent cation chamber migrate to the monovalent cation chamber, and the divalent cations in the divalent cation chamber are retained.

[0031] According to the above technical scheme, the present invention has the beneficial effect that the pure water produced by the membrane filter element is transported to the water inlet end of the electrodialysis water purification filter element, thereby entering the divalent cation chamber and the monovalent cation chamber. When the electrodialysis water purification filter element is working, the concentration of divalent cations in the water flowing out of the divalent cation chamber does not change, the concentration of monovalent cations is greatly reduced, and the concentration of monovalent cations in the monovalent cation chamber will increase, that is, the monovalent cations in the divalent cation chamber are moved forward to the monovalent cation chamber, and the divalent cations are retained in the divalent cation chamber, so as to separate the monovalent cations and divalent cations in the water, thereby changing the water quality, and then the pure water in the divalent cation chamber is transported to the drinking water pipeline for users to drink, thereby solving the problem that the existing water purifiers generally have extremely low calcium and magnesium ion content and relatively high monovalent sodium ion content. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 is a cross-sectional view of an electrodialysis water purification filter element provided by an embodiment of the present invention;

[0033] Figure 2 is a cross-sectional view of an electrodialysis water purification filter element provided by an embodiment of the present invention;

[0034] Figure 3 This is a schematic diagram of water flow using the electrodialysis water purification filter element provided by an embodiment of the present invention;

[0035] Figure 4 It is a schematic diagram of the glue line of the electrodialysis water purification filter element provided by the embodiment of the present invention;

[0036] Figure 5 Schematic diagram of another rubber line of the electrodialysis water purification filter element provided by the embodiment of the present invention;

[0037] Figure 6 Schematic diagram of another rubber line of the electrodialysis water purification filter element provided by the embodiment of the present invention;

[0038] Figure 7 It is a schematic diagram of the structure of a water purifier with an electrodialysis function provided by an embodiment of the present invention;

[0039] Figure 8It is a schematic structural diagram of a water purifier with electrodialysis function provided by another embodiment of the present invention.

[0040] Among them, the electrodialysis water purification filter element 1, the cathode 11, the cathode wire 111, the anode 12, the anode wire 121, the ion exchange module 13, the first grid 131, the selective permeable positive membrane 132, the second grid 133, the negative membrane 134, and the rubber wire 10;

[0041] Central tube 14, shell 15, first interface 151, second interface 152, third interface 153, upper end cover 16, lower end cover 17;

[0042] Drinking water pipeline 3, membrane filter element 4, first wastewater pipeline 21, second wastewater pipeline 22, check valve 23, extreme water pipeline 24, first flow limiting device 25, second flow limiting device 26, water inlet pipeline 27, and boosting device 28. DETAILED DESCRIPTION

[0043] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0044] like Figures 1 to 7 As shown, an embodiment of the present invention proposes a water purifier with electrodialysis function, the water purifier comprises an electrodialysis water purification filter element 1, a drinking water pipeline 3 and a membrane filter element 4, the electrodialysis water purification filter element 1 comprises a cathode 11, an anode 12 and an ion exchange module 13, the ion exchange module 13 is placed between the cathode 11 and the anode 12; a divalent cation chamber and a monovalent cation chamber are formed in the ion exchange module 13, the water inlet ends of the divalent cation chamber and the monovalent cation chamber are connected to the pure water outlet of the membrane filter element 4, and the water outlet end of the divalent cation chamber is connected to the drinking water pipeline 3; under the action of the electric field of the anode 12 and the cathode 11, the monovalent cations in the divalent cation chamber migrate to the monovalent cation chamber, and the divalent cations in the divalent cation chamber are retained.

[0045] When the electrodialysis water purification filter element 1 is working, the direction of the current is from the positive electrode to the negative electrode, and the cations in the electrodialysis water purification filter element 1 will move along the direction of the current, and the anions will move against the direction of the current.

[0046] Water enters the divalent cation chamber and the monovalent cation chamber respectively. Under the action of the electric field, the monovalent cations in the divalent cation chamber enter the monovalent cation chamber, while the divalent cations cannot pass through and remain in the divalent cation chamber.

[0047] The pure water produced by the membrane filter element 4 is transported to the water inlet end of the electrodialysis water purification filter element 1, and then enters the divalent cation chamber and the monovalent cation chamber. When the electrodialysis water purification filter element 1 is working, the concentration of divalent cations in the water flowing out of the divalent cation chamber does not change, the concentration of monovalent cations is greatly reduced, and the concentration of monovalent cations in the monovalent cation chamber will increase, that is, the monovalent cations in the divalent cation chamber are moved forward to the monovalent cation chamber, and the divalent cations will be retained in the divalent cation chamber, so as to separate the monovalent cations and divalent cations in the water, thereby changing the water quality, and then the pure water in the divalent cation chamber is transported to the drinking water pipeline for users to drink, so as to solve the problem that the existing water purifiers generally have extremely low calcium and magnesium ion content and relatively high monovalent sodium ion content.

[0048] In this embodiment, the electrodialysis water purification filter element 1 includes a central tube 14 , a shell 15 , an upper end cover 16 and a lower end cover 17 , and the central tube 14 , the upper end cover 16 and the lower end cover 17 are all located in the shell 15 .

[0049] One end of the upper end cover 16 is connected to the upper end of the housing 15, and the other end cover is provided at the upper end of the ion exchange module 13. The upper end cover 16 and the upper end of the ion exchange module 13 form a water inlet channel. The housing 15 is provided with a third interface 153, and the third interface 153 is connected to the water inlet channel. The third interface 153 is a water inlet end, which is used to connect to the pure water port of the membrane filter element.

[0050] Specifically, one end of the upper end cover 16 is connected to the upper end of the shell 15 in a sealed connection, and the other end of the end cover 16 is connected to the upper end of the ion exchange module 13 in a sealed connection.

[0051] The central tube 14 is connected to the upper end of the shell 15, and the central tube 14 has an inner flow channel and an outer flow channel. The upper end of the shell 15 is provided with a second interface 152 and a first interface 151, wherein the second interface 152 is in communication with the inner flow channel, and the first interface 151 is in communication with the outer flow channel. The second interface 152 is connected to a drinking water pipeline to output water in the divalent cation chamber, and the first interface 151 is connected to a wastewater pipeline to discharge water in the monovalent cation chamber.

[0052] In this embodiment, the central tube 14 has two layers of inner and outer straight flow channels, the inner flow channel is complete, and the outer flow channel has an opening in the tube wall away from the water inlet end and is connected to the outside of the tube wall.

[0053] Specifically, the central tube 14 is connected to the upper end of the shell 15 in a sealed manner, and the inner flow channel and the outer flow channel are respectively connected to different water inlets and outlets.

[0054] The ion exchange module 13 is arranged around the outer wall of the central tube 14, and the cathode 11 is arranged between the inner wall of the ion exchange module 13 and the outer wall of the central tube 14. The cathode 11 and the inner wall of the ion exchange module 13 form a cathode 11 water chamber, and the cathode 11 water chamber is connected to the outer flow channel. The polar water in the cathode 11 water chamber is discharged to the wastewater pipeline through the outer flow channel and the first interface 151.

[0055] The anode 12 is disposed on the inner wall of the housing 15 , and the anode 12 and the outer wall of the ion exchange module 13 form an anode 12 water chamber.

[0056] The lower end cover 17 is covered at the lower end of the ion exchange module 13, and the lower end cover 17 and the lower end of the ion exchange module 13 form a water production channel, and the water production channel is respectively connected to the divalent cation chamber and the inner flow channel, and the lower end cover 17 is provided with a connecting port, and the connecting port is respectively connected to the outer flow channel and the anode 12 water chamber. The water in the divalent cation chamber is transported to the drinking water pipeline through the water production channel, the inner flow channel, and the second interface 152. The polar water in the anode 12 water chamber enters the outer flow channel through the connecting port, and then is discharged to the wastewater pipeline through the first interface 151.

[0057] Specifically, the lower end cover 17 is sealedly connected to the lower end of the ion exchange module 13 and is sealedly connected to the inner flow channel and the outer flow channel of the central tube.

[0058] The water inlet channel is communicated with the divalent cation chamber and the monovalent cation chamber respectively, and the monovalent cation chamber is provided with at least two openings, at least one of which is communicated with the cathode 11 water chamber, and at least another of which is communicated with the anode 12 water chamber. In this embodiment, the specific number of the at least two openings is two, and pure water enters the water inlet channel through the third interface 153, and then flows into the divalent cation chamber and the monovalent cation chamber respectively, and the monovalent cations in the monovalent cation chamber migrate to the divalent cation chamber, and then the water in the monovalent cation chamber enters the cathode 11 water chamber and the anode 12 water chamber respectively through the two openings.

[0059] In some embodiments, the water inlet channel may also be connected to the cathode 11 water chamber and the anode 12 water chamber.

[0060] In this embodiment, the ion exchange module 13 includes a first grid 131, a selectively permeable cation membrane 132, a second grid 133 and an anion membrane 134, wherein the first grid 131, the selectively permeable cation membrane 132, the second grid 133 and the anion membrane 134 are stacked in sequence from the inside to the outside, and spirally wound so that the first grid 131 is stacked on the anion membrane 134, wherein the selectively permeable cation membrane 132 is a cation membrane that allows monovalent cations to pass through and intercepts divalent and above cations. The first grid 131 and the second grid 133 are both used to separate the selectively permeable cation membrane 132, the anion membrane 134, and the cathode 11 to form a water flow channel. The selectively permeable cation membrane 132 can intercept anions and divalent cations and allow monovalent cations to pass through; the anion membrane 134 intercepts cations and allows anions to pass through. In addition, the ion exchange module 13 is a spiral configuration, which is placed in a cylindrical filter barrel, can withstand higher water pressure and has better manufacturability.

[0061] In this embodiment, the anion membrane 134 and the selectively permeable cation membrane 132 are sealed and connected at one end close to the central tube 14. In other words, the starting end of the spiral configuration is sealed and connected.

[0062] In this embodiment, the divalent cation chamber is composed of the selectively permeable cation membrane 132 and the anion membrane 134, and the second grid 133 is disposed in the divalent cation chamber. The divalent cation chamber is formed by the selectively permeable cation membrane 132, the anion membrane 134, and the second grid 133 sandwiched between the selectively permeable cation membrane 132 and the anion membrane 134.

[0063] In this embodiment, the end of the divalent cation chamber away from the central tube 14 is sealed with a glue line 10, and the end of the divalent cation chamber close to the water production channel is not sealed with a glue line 10 to form a first flow channel opening connected to the water production channel. That is, at the end of the spiral configuration, the divalent cation chamber is sealed, the end of the divalent cation chamber close to the water production channel is not sealed with a glue line 10 to form a first flow channel opening connected to the water production channel, and the end of the divalent cation chamber close to the water inlet channel is not sealed with a glue line 10 to communicate with the water inlet channel.

[0064] In this embodiment, the monovalent cation chamber is composed of the selectively permeable cation membrane 132 and the anion membrane 134, and the first grid 131 is disposed in the monovalent cation chamber. The monovalent cation chamber is formed by the selectively permeable cation membrane 132, the anion membrane 134, and the first grid 131 sandwiched between the selectively permeable cation membrane 132 and the anion membrane 134.

[0065] In this embodiment, the end of the monovalent cation chamber away from the central tube 14 is sealed with an intermittent glue line 10, at least two of the openings are formed by the discontinuity of the intermittent glue line 10, and the end of the divalent cation chamber close to the water production channel is sealed with a glue line 10. That is to say, at the end of the spiral configuration, the monovalent cation chamber is sealed and connected by an intermittent glue line 10. Because it is an intermittent glue line 10, a gap will be formed for this purpose, that is, the above-mentioned opening. The two openings allow the water from the monovalent cation chamber to flow out in two directions. The first direction is to mix with the cathode 11 water and enter the central tube 14 outer flow channel from the opening of the central tube 14 outer flow channel. The second direction is to flow out from the end away from the central tube 14 with a gap in the glue line 10, mix with the anode 12 water, and then enter the central tube 14 outer flow channel. After merging with the cathode 11 water and another part of the monovalent cation water, it flows out from the first interface 151. One end of the divalent cation chamber close to the water production channel is not sealed with a glue line 10 to form a first channel opening connected to the water production channel, and one end of the divalent cation chamber close to the water inlet channel is not sealed with a glue line 10 to connect to the water inlet channel.

[0066] In this embodiment, the cathode 11 water chamber is formed by the selectively permeable cation membrane 132, the cathode 11 and the first grid 131, and the anode 12 water chamber is formed between the cathodic membrane 134 and the anode 12. The first grid 131 is sandwiched between the selectively permeable cation membrane 132 and the cathode 11.

[0067] In this embodiment, the electrodialysis water purification filter element 1 includes an anode wire 121 and a cathode wire 111, one end of the anode wire 121 is connected to the anode 12, and the other end passes through the shell 15 for connection to the positive pole of the power supply, and one end of the cathode wire 111 is connected to the cathode 11, and the other end passes through the shell 15 for connection to the negative pole of the power supply.

[0068] In this embodiment, the water purifier includes a wastewater pipeline, which includes a first wastewater pipeline 21, a second wastewater pipeline 22 and a check valve 23, wherein the first wastewater pipeline 21 is connected to the wastewater outlet of the membrane filter element 4, the first end of the second wastewater pipeline 22 is connected to the wastewater outlet of the monovalent cation chamber, the second end of the second wastewater pipeline 22 is connected to the branch port of the first wastewater pipeline 21, and the check valve 23 is arranged on the second wastewater pipeline 22. The wastewater of the membrane filter element 4 and the wastewater of the electrodialysis water purification filter element 1 are both connected to the first wastewater pipeline 21, and then discharged through the first wastewater pipeline 21.

[0069] In this embodiment, the wastewater pipeline includes an extreme water pipeline 24, one end of which is connected to the outlets of the anode water chamber and the cathode water chamber respectively, and the other end is connected to the branch port of the second wastewater pipeline 22, and the branch port of the second wastewater pipeline 22 is located between the first end of the second wastewater pipeline 22 and the check valve 23. The wastewater of the electrodialysis water purification filter element 1 is connected to the second wastewater pipeline 22, and then connected to the first wastewater pipeline 21, so that the wastewater of the membrane filter element 4, the wastewater of the electrodialysis water purification filter element 1 and the extreme water of the wastewater of the electrodialysis water purification filter element 1 are all discharged through the first wastewater pipeline 21.

[0070] like Figure 8 As shown, in some embodiments, the wastewater pipeline includes a first flow limiting device 25 and a second flow limiting device 26, the first flow limiting device 25 is arranged on the extreme water pipeline 24, and the second flow limiting device 26 is arranged on the second wastewater pipeline 22. The second flow limiting device 26 is located between the branch port of the second wastewater pipeline 22 and the first end of the second wastewater pipeline 22. The first flow limiting device 25 and the second flow limiting device 26 are respectively arranged on the extreme water pipeline 24 and the second wastewater pipeline 22, the purpose of which is to reduce the flow of extreme water and wastewater, reduce the amount of wastewater finally discharged, and improve the utilization rate of raw water.

[0071] In this embodiment, the water purifier includes a water inlet pipeline, which includes a water inlet pipe 27 and a booster device 28. The water inlet pipe 27 is connected to the water inlet of the membrane filter element 4, and the booster device 28 is arranged on the water inlet pipe 27.

[0072] The function of the booster device 28 is to increase the raw water pressure to reach the water production working pressure of the membrane filter element.

[0073] The function of the membrane filter element 4 is to remove part of the ions in the water and prepare pure water. The removal rate of monovalent ions of the membrane filter element 4 is 10%-80%, and the removal rate of divalent ions is 30-80%.

[0074] The function of the electrodialysis water purification filter element 1 is to retain the divalent ions in the pure water prepared by the membrane filter element 4 and remove the monovalent ions therein. The monovalent ion removal rate of the electrodialysis water purification filter element is 50%-100%, and the divalent ion removal rate is 0-20%.

[0075] The water purifier preferably uses nanofiltration membrane or reverse osmosis membrane with a lower desalination rate for the membrane filter element to ensure that the outlet water contains a certain amount of divalent ions.

[0076] Under the premise of preventing the effluent from scaling, the calcium and magnesium ions needed by the human body in the raw water are retained, while more monovalent ions (mainly sodium ions) in the water are removed, making the effluent more in line with the demand for healthy water use.

[0077] To summarize, the water inlet pipe 27 is connected to the raw water, and under the pressure boosting action of the boosting device 28, the raw water is transported to the membrane filter element 4 for filtration, and the pure water filtered out of the membrane filter element 4 is then transported to the electrodialysis water purification filter element 1. The monovalent cations in the divalent cation chamber of the electrodialysis water purification filter element 1 move forward to the monovalent cation chamber, and the divalent cations will be retained in the divalent cation chamber, so as to separate the monovalent cations and divalent cations in the water, thereby changing the water quality, and then the pure water in the divalent cation chamber is transported to the drinking water pipe 3 for users to drink.

[0078] The embodiment of the present invention also proposes a water purification system, including a water purifier with an electrodialysis function, the water purifier including an electrodialysis water purification filter element 1, a drinking water pipeline 3 and a membrane filter element 4, the electrodialysis water purification filter element 1 including a cathode 11, an anode 12 and an ion exchange module 13, the ion exchange module 13 is placed between the cathode 11 and the anode 12; a divalent cation chamber and a monovalent cation chamber are formed in the ion exchange module 13, the water inlet ends of the divalent cation chamber and the monovalent cation chamber are connected to the pure water outlet of the membrane filter element 4, and the water outlet end of the divalent cation chamber is connected to the drinking water pipeline 3; under the action of the electric field of the anode 12 and the cathode 11, the monovalent cations in the divalent cation chamber migrate to the monovalent cation chamber, and the divalent cations in the divalent cation chamber are retained.

[0079] When the electrodialysis water purification filter element 1 is working, the direction of the current is from the positive electrode to the negative electrode, and the cations in the electrodialysis water purification filter element 1 will move along the direction of the current, and the anions will move against the direction of the current.

[0080] Water enters the divalent cation chamber and the monovalent cation chamber respectively. Under the action of the electric field, the monovalent cations in the divalent cation chamber enter the monovalent cation chamber, while the divalent cations cannot pass through and remain in the divalent cation chamber.

[0081] The pure water produced by the membrane filter element 4 is transported to the water inlet end of the electrodialysis water purification filter element 1, and then enters the divalent cation chamber and the monovalent cation chamber. When the electrodialysis water purification filter element 1 is working, the concentration of divalent cations in the water flowing out of the divalent cation chamber does not change, the concentration of monovalent cations is greatly reduced, and the concentration of monovalent cations in the monovalent cation chamber will increase, that is, the monovalent cations in the divalent cation chamber are moved forward to the monovalent cation chamber, and the divalent cations will be retained in the divalent cation chamber, so as to separate the monovalent cations and divalent cations in the water, thereby changing the water quality, and then the pure water in the divalent cation chamber is transported to the drinking water pipeline for users to drink, so as to solve the problem that the existing water purifiers generally have extremely low calcium and magnesium ion content and relatively high monovalent sodium ion content.

[0082] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A water purifier with electrodialysis function, characterized in that: The water purifier comprises an electrodialysis water purification filter element, a drinking water pipeline and a membrane filter element, wherein the electrodialysis water purification filter element comprises a cathode, an anode and an ion exchange module, wherein the ion exchange module is placed between the cathode and the anode; A divalent cation chamber and a monovalent cation chamber are formed in the ion exchange module, the water inlet ends of the divalent cation chamber and the monovalent cation chamber are connected to the pure water outlet of the membrane filter element, and the water outlet end of the divalent cation chamber is connected to the drinking water pipeline; Under the action of the electric field between the anode and the cathode, the monovalent cations in the divalent cation chamber migrate to the monovalent cation chamber, and the divalent cations in the divalent cation chamber are retained.

2. The water purifier with electrodialysis function according to claim 1, characterized in that: The electrodialysis water purification filter element comprises a shell and an upper end cover, wherein the upper end cover is located inside the shell; One end of the upper end cover is connected to the upper end of the shell, and the other end cover is arranged at the upper end of the ion exchange module. The upper end cover and the upper end of the ion exchange module form a water inlet channel. The shell is provided with a third interface, and the third interface is connected to the water inlet channel.

3. The water purifier with electrodialysis function according to claim 2, characterized in that: The electrodialysis water purification filter element includes a central tube located in the housing, the central tube is connected to the upper end of the housing, the central tube has an inner flow channel and an outer flow channel, the upper end of the housing is provided with a second interface and a first interface, the second interface is communicated with the inner flow channel, and the first interface is communicated with the outer flow channel; The ion exchange module is arranged around the outer tube wall of the central tube, the cathode is arranged between the inner side wall of the ion exchange module and the outer tube wall of the central tube, the cathode and the inner side wall of the ion exchange module form a cathode water chamber, and the cathode water chamber is communicated with the outer flow channel; The anode is arranged on the inner wall of the shell, and the anode and the outer wall of the ion exchange module form an anode water chamber.

4. The water purifier with electrodialysis function according to claim 3, characterized in that: The electrodialysis water purification filter element comprises a lower end cover located in the housing, the lower end cover is arranged at the lower end of the ion exchange module, the lower end cover and the lower end of the ion exchange module form a water production flow channel, the water production flow channel is respectively connected to the divalent cation chamber and the inner flow channel, the lower end cover is provided with a communication port, and the communication port is respectively connected to the outer flow channel and the anode water chamber; The water inlet channel is communicated with the divalent cation chamber and the monovalent cation chamber respectively. The monovalent cation chamber is provided with at least two openings, at least one of the openings is communicated with the cathode water chamber, and at least another opening is communicated with the anode water chamber.

5. The water purifier with electrodialysis function according to claim 4, characterized in that: The ion exchange module includes a first grid, a selectively permeable cation membrane, a second grid and an anion membrane, wherein the first grid, the selectively permeable cation membrane, the second grid and the anion membrane are stacked in sequence from the inside to the outside and spirally wound so that the first grid is stacked on the anion membrane, wherein the selectively permeable cation membrane is a cation membrane that allows monovalent cations to pass through and retains divalent and higher cations.

6. The water purifier with electrodialysis function according to claim 5, characterized in that: The anion membrane and the selectively permeable cation membrane are sealed and connected close to one end of the central tube.

7. The water purifier with electrodialysis function according to claim 6, characterized in that: The divalent cation chamber is composed of the selectively permeable cation membrane and the anion membrane, and the second grid is arranged in the divalent cation chamber.

8. The water purifier with electrodialysis function according to claim 7, characterized in that: The end of the divalent cation chamber away from the central tube is sealed with a rubber line, and the end of the divalent cation chamber close to the water production channel is not sealed with a rubber line to form a first channel opening connected to the water production channel.

9. The water purifier with electrodialysis function according to claim 6, characterized in that: The monovalent cation chamber is composed of the selectively permeable cation membrane and the anion membrane, and the first grid is arranged in the monovalent cation chamber.

10. The water purifier with electrodialysis function according to claim 9, characterized in that: The end of the monovalent cation chamber away from the central tube is sealed with an intermittent glue line, at least two of the openings are formed by the gaps of the intermittent glue line, and the end of the divalent cation chamber close to the water production channel is sealed with a glue line.

11. The water purifier with electrodialysis function according to claim 5, characterized in that: The cathode water chamber is formed by the selectively permeable cation membrane, the cathode and the first grid.

12. The water purifier with electrodialysis function according to claim 5, characterized in that: The anode water chamber is formed between the cathodic membrane and the anode.

13. The water purifier with electrodialysis function according to claim 4, characterized in that: The electrodialysis water purification filter element includes an anode wire and a cathode wire, one end of the anode wire is connected to the anode, and the other end passes through the shell for connection to the positive pole of the power supply, and one end of the cathode wire is connected to the cathode, and the other end passes through the shell for connection to the negative pole of the power supply.

14. The water purifier with electrodialysis function according to claim 4, characterized in that: The water purifier includes a wastewater pipeline, which includes a first wastewater pipeline, a second wastewater pipeline and a check valve, the first wastewater pipeline is connected to the wastewater port of the membrane filter element, the first end of the second wastewater pipeline is connected to the wastewater port of the monovalent cation chamber, the second end of the second wastewater pipeline is connected to the branch port of the first wastewater pipeline, and the check valve is arranged on the second wastewater pipeline.

15. The water purifier with electrodialysis function according to claim 14, characterized in that: The wastewater pipeline includes an extreme water pipe, one end of which is connected to the water outlets of the anode water chamber and the cathode water chamber respectively, and the other end is connected to the branch port of the second wastewater pipe, and the branch port of the second wastewater pipe is located between the first end of the second wastewater pipe and the check valve.

16. The water purifier with electrodialysis function according to claim 15, characterized in that: The wastewater pipeline includes a first flow limiting device and a second flow limiting device. The first flow limiting device is arranged on the extreme water pipeline, and the second flow limiting device is arranged on the second wastewater pipeline. The second flow limiting device is located at the branch port of the second wastewater pipeline and is located at the first end of the second wastewater pipeline. The second flow limiting device is located between the branch port of the second wastewater pipeline and the first end of the second wastewater pipeline.

17. The water purifier with electrodialysis function according to claim 4, characterized in that: The water purifier comprises a water inlet pipeline, which comprises a water inlet pipe and a pressure boosting device. The water inlet pipe is communicated with the water inlet of the membrane filter element, and the pressure boosting device is arranged on the water inlet pipe.

18. A water purification system, characterized in that: It comprises a water purifier with electrodialysis function as described in any one of claims 1 to 17.

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