Electrodialysis filtering device and water purifier

Abstract

The utility model discloses an electrodialysis filtering device and a water purifier, and the electrodialysis filtering device comprises a shell, an electrodialysis filtering device and a water purifier, the shell is internally provided with a mounting cavity; the at least two electrodialysis filter elements are transversely arranged and are arranged in the mounting cavity in parallel in a laminated manner along the vertical direction, and each electrodialysis filter element is provided with a water inlet and a water outlet; the waterway plate is vertically arranged in the mounting cavity and located on the transverse sides of the electrodialysis filter elements, the waterway plate is provided with water inlet channels and water outlet channels corresponding to the electrodialysis filter elements so as to be connected with the corresponding water inlets and the corresponding water outlets respectively, and the water outlet channels can be communicated with one another; a regeneration channel and a wastewater channel corresponding to each electrodialysis filter element are also arranged on the waterway plate and are respectively connected with the corresponding water outlet and water inlet; and the water inlet channel and the regeneration channel are connected with the raw water channel. The electrodialysis filter element regeneration device has the characteristic of small size through reasonable layout so as to be convenient to install, and when the electrodialysis filter element regeneration exists, the water flow of a user is hardly influenced, so that the non-inductive regeneration effect is achieved.

Description

Technical Field

[0001] This utility model relates to the field of water treatment equipment, and in particular to an electrodialysis filtration device and a water purifier. Background Technology

[0002] A water purifier is a water treatment device that performs deep filtration and purification of water according to usage requirements. It achieves desalination and regeneration processes through electrodialysis filter cartridges. Traditional water purifiers use two electrodialysis filter cartridges that regenerate each other. When either cartridge is regenerating, the pure water produced by the other cartridge is entirely used to regenerate the cartridge undergoing regeneration. Thus, when either cartridge is regenerating, the entire water purifier does not produce pure water, significantly reducing the time users can enjoy pure water and causing inconvenience in daily use.

[0003] To address the aforementioned issues, existing technology discloses a continuous-flow bipolar membrane electro-assisted deionization system, comprising multiple filter cartridges installed in a pipeline system. At least one filter cartridge, while producing water, allocates a portion of the purified water as regeneration feed water to other filter cartridges requiring regeneration. This allows for continuous purification of pure water during regeneration, improving user experience. However, this solution has the following drawbacks: Firstly, the regeneration of the filter cartridges relies entirely on the purified water produced by the water-producing filter cartridges, significantly reducing user water flow and impacting user experience, while also increasing the water purifier's energy consumption. Secondly, integrating multiple filter cartridges into the water purifier results in a complex and disorganized water circuit structure, leading to a larger water purifier size and installation limitations. Utility Model Content

[0004] In order to overcome at least one of the defects of the prior art, the present invention provides an electrodialysis filtration device and a water purifier, which has the characteristics of small size through reasonable layout, making it easy to install, and when the electrodialysis filter element is regenerated, it hardly affects the user's water flow, achieving the effect of imperceptible regeneration.

[0005] The technical solution adopted by this utility model to solve its problem is:

[0006] In a first aspect, this utility model provides an electrodialysis filtration device, comprising:

[0007] The housing has an internal mounting cavity.

[0008] At least two electrodialysis filter elements are arranged horizontally and stacked in parallel in the installation cavity. Each electrodialysis filter element is provided with an inlet and an outlet.

[0009] The water circuit board is vertically installed in the installation cavity and located on the horizontal side of the electrodialysis filter element. The water circuit board is provided with an inlet channel and an outlet channel for each electrodialysis filter element to connect to the corresponding inlet and outlet, and the outlet channels can be connected to each other.

[0010] The water circuit board is also equipped with a regeneration channel and a wastewater channel for each electrodialysis filter element to connect to the corresponding water outlet and water inlet, respectively. Both the water inlet channel and the regeneration channel are connected to the raw water channel.

[0011] In a preferred embodiment, the electrodialysis filter element includes an outer barrel, an electrodialysis membrane stack, and an electrode assembly. The outer barrel has an internal cavity. The inlet and outlet are both located at the axial end of the outer barrel near the water circuit board and are connected to the cavity. The electrodialysis membrane stack and the electrode assembly are coaxially arranged in the cavity. A gap is provided between the electrodialysis membrane stack and the inner wall of the outer barrel to connect to the inlet.

[0012] The electrode assembly includes an inner support inside the electrodialysis membrane stack, an outer support outside the electrodialysis membrane stack, and electrode wires wound on the inner and outer supports. The inner support has an axially extending channel that communicates with the outlet, and the inner support has a water outlet corresponding to the electrodialysis membrane stack that communicates with the channel.

[0013] In a preferred embodiment, the outer barrel includes a barrel body with an internal cavity. One axial end of the barrel body has an opening communicating with the cavity. An end cap is detachably installed at the opening of the barrel body to open or close the cavity. The inlet and outlet are located at the ends of the barrel body opposite to the opening, and the inlet is located at the highest point of the inner wall of the barrel body. The wastewater channel extends laterally and / or vertically upward along the flow direction of the wastewater.

[0014] In a preferred embodiment, the end of the barrel facing away from the opening is provided with an external wiring port and an internal wiring port. The electrode wire on the inner support is electrically connected to an external power source through the internal wiring port, and the electrode wire on the outer support is electrically connected to an external power source through the external wiring port.

[0015] In a preferred embodiment, the electrodialysis membrane stack includes a central tube and a membrane assembly wound and fixed on the central tube. The axial end faces of the membrane assembly are sealed and fixed by a cap. The central tube has a plurality of water permeable holes. An inner support is disposed inside the central tube, and the inner support has a water outlet at the end of the membrane assembly away from the outlet.

[0016] In a preferred embodiment, the electrodialysis membrane stack includes at least two membrane segments extending axially along the receiving cavity. Each membrane segment includes a central tube and a membrane assembly wound and fixed on the central tube. The inner support is provided with a water outlet at the end of each membrane segment away from the outlet.

[0017] Adjacent membrane segments are connected by a support frame, and the support frame seals and fixes the end face of the corresponding membrane segment.

[0018] In a preferred embodiment, at least one axial end of the inner support and at least one cap are fixedly connected to the inner wall of the outer barrel, and the support frame is fixedly connected to the outer support.

[0019] In a preferred embodiment, the installation cavity is further provided with a pre-filter element that is placed horizontally and stacked vertically with at least two electrodialysis filter elements. The water inlet channel and regeneration channel on the water circuit board are connected to the raw water channel via the pre-filter element, and the pre-filter element can be directly connected to the water outlet channel on the water circuit board.

[0020] In a preferred embodiment, the water production capacity of at least two electrodialysis filter cartridges is set with a gradient of difference A. When the difference is less than A during water production, the raw water channel is connected to the inlet channel on the water circuit board corresponding to the electrodialysis filter cartridge with the lower water production capacity.

[0021] Secondly, this utility model provides a water purifier, including: the above-mentioned electrodialysis filtration device.

[0022] The electrodialysis filtration device and water purifier provided by this utility model have the following technical effects:

[0023] (1) At least two electrodialysis filter elements are placed horizontally and stacked in parallel in the vertical direction in the installation cavity. This can reasonably allocate the horizontal and vertical space. With the water circuit board set vertically in the installation cavity and located on the horizontal side of the electrodialysis filter element, a reasonable layout of the water circuit can be achieved. This makes the internal layout of the shell neat and the overall volume small, so as to reduce the space occupied by the electrodialysis filtration device. When applied to water purifiers, it can facilitate the installation of water purifiers and provide a wider range of installation location options.

[0024] (2) Based on the inlet and outlet channels, the water circuit board is also equipped with regeneration and wastewater channels for each electrodialysis filter element, which are respectively connected to the corresponding outlet and inlet. Both the inlet and regeneration channels are connected to the raw water channel. In the regeneration process, the raw water initially flows backward through the electrodialysis filter element via the raw water channel and the regeneration channel, and is reverse-energized to desorb ions. In the final stage, a small amount of pure water produced by the normally producing electrodialysis filter element is reverse-energized into the regenerated electrodialysis filter element for rinsing, thus completing the regeneration of the electrodialysis filter element. In this way, only a small amount of pure water produced by the normally producing electrodialysis filter element is used in the regeneration process, which has virtually no impact on the user's water flow rate, achieving a seamless regeneration effect. This not only ensures the user's water experience and avoids excessive waste of pure water, but also helps to reduce the energy consumption of the water purifier. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the structure of the electrodialysis filter element of this utility model;

[0026] Figure 2This is an axial sectional view of the first embodiment of the electrodialysis filter element of this utility model.

[0027] Figure 3 This is an exploded view of the first embodiment of the electrodialysis filter element of this utility model;

[0028] Figure 4 This is an axial sectional view of a second embodiment of the electrodialysis filter element of this utility model.

[0029] Figure 5 This is an exploded view of a second embodiment of the electrodialysis filter element of this utility model.

[0030] Figure 6 for Figure 4 Exploded view;

[0031] Figure 7 This is a schematic diagram of the structure of the electrode wire wound on the inner support of this utility model;

[0032] Figure 8 This is a schematic diagram of the structure of the electrode wire wound on the outer support of this utility model;

[0033] Figure 9 This is a water circuit diagram of the electrodialysis filtration device with three electrodialysis filter elements according to this utility model;

[0034] Figure 10 This is a water circuit diagram of the electrodialysis filtration device with two electrodialysis filter elements according to this utility model.

[0035] The meanings of the reference numerals in the attached figures are as follows:

[0036] 1000, Electrodialysis filter element; 100, Outer tank; 110, Receiving cavity; 120, Inlet; 130, Outlet; 140, Gap; 150, Tank body; 151, Opening; 152, External connection port; 153, Internal connection port; 160, End cap; 170, First limiting groove; 180, Second limiting groove; 200, Electrodialysis membrane stack; 210, Central tube; 220, Membrane module; 230, Sealing cap; 231, Limiting part; 240, Membrane segment; 250, Support frame; 300, Electrode assembly; 310, Inner support; 311, Channel; 312, Water outlet; 313, Limiting end; 320, Outer support; 330, Electrode wire; 340, Support strip; 341, Slot;

[0037] 1. Raw water channel; 2. Pre-filter cartridge; 3. Flow meter; 4. Electrodialysis cartridge No. 1; 5. Electrodialysis cartridge No. 2; 6. Electrodialysis cartridge No. 3; 7. Inlet channel No. 1; 8. Inlet channel No. 2; 9. Inlet channel No. 3; 10. Three-way valve No. 1; 11. Three-way valve No. 2; 12. Wastewater channel No. 1; 13. Three-way valve No. 3; 14. Wastewater channel No. 2; 15. Three-way valve No. 4; 16. Three-way valve No. 5; 17. Wastewater channel No. 3; 18. 19. No. 6 three-way valve; 20. No. 1 outlet water channel; 21. No. 2 regeneration channel; 22. No. 7 three-way valve; 23. No. 2 outlet water channel; 24. No. 8 three-way valve; 25. No. 3 regeneration channel; 26. No. 9 three-way valve; 27. No. 3 outlet water channel; 28. No. 4 outlet water channel; 29. ​​No. 10 three-way valve; 30. No. 11 three-way valve; 31. Four-way valve; 32. Main outlet water channel; 33. No. 12 three-way valve; 34. TDS meter. Detailed Implementation

[0038] To better understand and implement this invention, the technical solutions in the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings.

[0039] In the description of this utility model, it should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0040] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

[0041] See Figure 1 and Figure 9This utility model provides an electrodialysis filtration device, including a housing, a water circuit plate, and at least two electrodialysis filter elements 1000. The housing has an internal mounting cavity, within which at least two electrodialysis filter elements 1000 are placed horizontally and stacked vertically in parallel. Each electrodialysis filter element 1000 has an inlet 120 and an outlet 130. The water circuit plate is vertically positioned within the mounting cavity, located on one side of the horizontal axis of the electrodialysis filter elements 1000. The water circuit plate has an inlet channel and an outlet channel corresponding to each electrodialysis filter element 1000, respectively connecting to the corresponding inlet 120 and outlet 130, and the outlet channels are interconnected. The water circuit plate also has a regeneration channel and a wastewater channel corresponding to each electrodialysis filter element 1000, respectively connecting to the corresponding outlet 130 and inlet 120. Both the inlet channel and the regeneration channel are connected to the raw water channel 1.

[0042] At least two electrodialysis filter elements 1000 of the electrodialysis filtration device are placed horizontally and stacked in parallel vertically in the installation cavity, which can reasonably allocate the horizontal and vertical space. With the water circuit plate set vertically in the installation cavity and located on the horizontal side of the electrodialysis filter element 1000, a reasonable layout of the water circuit can be achieved, so that the internal layout of the shell is neat and the overall volume is small, thereby reducing the space occupied by the electrodialysis filtration device.

[0043] In the electrodialysis filtration device, the raw water channel 1 connects to external raw water, such as untreated tap water, and the outlet channel connects to an external water outlet device. In the water production mode, each electrodialysis filter element 1000 has a water production function. If a user needs water, it can be produced by one electrodialysis filter element 1000 alone, or by two or more electrodialysis filter elements 1000 working together. The number of electrodialysis filter elements 1000 used for water production is determined by the number of electrodialysis filter elements 1000 in the electrodialysis filtration device, the water production capacity, and the user's water consumption. Raw water flows through the raw water channel 1 to the corresponding inlet channel on the water circuit board, and then enters the corresponding electrodialysis filter element 1000 through the inlet 120 to obtain pure water through electro-adsorption of ions. It then flows out from the outlet 130 and through the corresponding outlet channel to the external water outlet device for user use.

[0044] If at least one electrodialysis filter cartridge 1000 is being regenerated, in the early stage of regeneration, raw water flows through the raw water channel 1 to the corresponding regeneration channel on the water circuit board, and enters the electrodialysis filter cartridge 1000 that needs to be regenerated through the outlet 130. After reverse electrostatic desorption of ions to obtain wastewater, it flows out from the inlet 120 and is then discharged through the corresponding wastewater channel until the ions adsorbed in the electrodialysis filter cartridge 1000 that needs to be regenerated are basically desorbed. Then, in the final stage of regeneration, the supply of raw water to the electrodialysis filter element 1000 requiring regeneration is stopped. Instead, the raw water flows through the raw water channel 1 to the inlet channel on the water circuit board corresponding to at least one normally producing electrodialysis filter element 1000. The water then enters the normally producing electrodialysis filter element 1000 through the inlet 120, where it obtains pure water through electro-adsorption of ions and flows out through the outlet 130. It then flows through the corresponding outlet channel to the outlet channel of the aforementioned electrodialysis filter element 1000 requiring regeneration, and enters through the outlet 130 to rinse the filter element 1000. The wastewater is then discharged through the inlet 120 and the corresponding wastewater channel, thus completing the regeneration of the electrodialysis filter element 1000. If the user needs water during the rinsing process, the pure water produced by the normally producing electrodialysis filter element 1000 can be diverted through its outlet channel to an external water outlet device for the user's use.

[0045] Based on this, the electrodialysis filtration device of this utility model, in addition to the inlet and outlet water channels, also includes a regeneration channel and a wastewater channel on the water circuit board corresponding to each electrodialysis filter element 1000, which are respectively connected to the corresponding outlet 130 and inlet 120. Both the inlet and regeneration channels are connected to the raw water channel 1. During regeneration, initially, raw water flows in reverse through the raw water channel 1 and the regeneration channel through the electrodialysis filter element 1000 and is reverse-energized to desorb ions. In the final stage, a small amount of pure water produced by the normally producing electrodialysis filter element 1000 is reverse-energized into the regenerated electrodialysis filter element 1000 for rinsing, thus completing the regeneration of the electrodialysis filter element 1000. In this way, only a small amount of pure water produced by the normally producing electrodialysis filter element 1000 is used during the regeneration process, which has virtually no impact on the user's water flow rate, achieving a seamless regeneration effect. This not only ensures the user's water experience and avoids excessive waste of pure water, but also helps reduce the energy consumption of the electrodialysis filtration device.

[0046] It is worth noting that the electrodialysis filter cartridge 1000 of this utility model can be arranged in parallel in two, three, four, or even more configurations, depending on the user's water demand and the water production capacity of the electrodialysis filter cartridge 1000. One, two, three, or even more electrodialysis filter cartridges 1000 can produce water simultaneously, and one, two, or even more can be regenerated simultaneously. Generally, the water production capacity of one electrodialysis filter cartridge 1000 is sufficient for the user's needs, and typically only one electrodialysis filter cartridge 1000 is in regeneration mode to ensure the user's normal water demand. Preferably, two or three electrodialysis filter cartridges 1000 are configured within the electrodialysis filtration device. This ensures sufficient water production for the user's use while one electrodialysis filter cartridge 1000 is regenerating, without increasing cost or size.

[0047] See Figure 1-3 , Figure 7-8 The electrodialysis filter element 1000 includes an outer barrel 100, an electrodialysis membrane stack 200, and an electrode assembly 300. The outer barrel 100 has an internal cavity 110. The inlet 120 and the outlet 130 are both located at the axial ends of the outer barrel 100 near the water circuit board and are connected to the cavity 110. The electrodialysis membrane stack 200 and the electrode assembly 300 are coaxially arranged in the cavity 110. A gap 140 is provided between the electrodialysis membrane stack 200 and the inner wall of the outer barrel 100, which is connected to the inlet 120. The electrode assembly 300 includes an inner support 310 disposed within the electrodialysis membrane stack 200, an outer support 320 disposed outside the electrodialysis membrane stack 200, and an electrode wire 330 wound on the inner support 310 and the outer support 320. The inner support 310 has an axially extending channel 311 that communicates with the outlet 130, and the inner support 310 has an outlet 312 corresponding to the electrodialysis membrane stack 200 that communicates with the channel 311.

[0048] The outer tub 100 can be cylindrical, frustum-shaped, cuboid, or other structures. This invention uses a cylindrical outer tub 100 as an example. Generally, the inlet 120 and outlet 130 can be located anywhere on the outer tub 100, as long as it does not affect the water inlet and outlet efficiency. In this invention, both the inlet 120 and outlet 130 are located at the axial end of the outer tub 100 near the water circuit board, facilitating water circuit connection and further reducing the volume of the electrodialysis filtration device. The outlet 130 is preferably located in the central area of ​​the axial end of the outer tub 100, corresponding to the inner support 310, to reduce the water flow path and ensure efficient water use.

[0049] The outer radial side of the electrodialysis membrane stack 200 is the anode, and the inner radial side is the cathode. The outer support 320 has several perforations for water flow. Electrode wires 330 are wound around the inner support 310 and the outer support 320, and are electrically connected to an external power source to achieve electrodialysis. During water production, the electrode wires 330 on the outer support 320 are connected to the positive electrode, and the electrode wires 330 on the inner support 310 are connected to the negative electrode, enabling the electrodialysis membrane stack 200 to adsorb ions. During regeneration, the electrode wires 330 on the outer support 320 are connected to the negative electrode, and the electrode wires 330 on the inner support 310 are connected to the positive electrode, enabling the electrodialysis membrane stack 200 to desorb ions.

[0050] Both the inner support 310 and the outer support 320 have a number of axially extending support strips 340 protruding from their side walls. Each support strip 340 has a number of grooves 341 that are adapted to fix the electrode wire 330 along the axial direction, so as to achieve stable installation and neat winding of the electrode wire 330, and ensure the electrical connection effect.

[0051] Based on this, the working principle of the electrodialysis filter element 1000 is as follows:

[0052] During water production, the electrode wire 330 on the outer support 320 is connected to the positive electrode, and the electrode wire 330 on the inner support 310 is connected to the negative electrode. Raw water enters the receiving chamber 110 through the inlet 120, flows through the gap 140 to each channel of the electrodialysis membrane stack 200 to adsorb ions, and then enters the channel 311 through the outlet 312, and then flows out from the outlet 130 along the channel 311.

[0053] During regeneration, the electrode wire 330 on the outer support 320 is connected to the negative electrode, and the electrode wire 330 on the inner support 310 is connected to the positive electrode. Raw water enters the channel 311 from the outlet 130, and then flows through the water outlet 312 of the inner support 310 to each channel of the electrodialysis membrane stack 200 to desorb ions. Then, wastewater flows out from the inlet 120 through the gap 140, thereby completing the regeneration of the electrodialysis filter element 1000.

[0054] The outer barrel 100 includes a barrel body 150 with an internal receiving cavity 110. One axial end of the barrel body 150 has an opening 151 communicating with the receiving cavity 110. An end cap 160 is detachably installed at the opening 151 of the barrel body 150 to open or close the receiving cavity 110. An inlet 120 and an outlet 130 are located at the ends of the barrel body 150 opposite to the opening 151, with the inlet 120 corresponding to the highest point of the inner wall of the barrel body 150. The wastewater channel extends horizontally and / or vertically upwards along the flow direction of the wastewater. The end cap 160 is connected to the barrel body 150 by snap-fit, screw connection, threaded connection, etc., ensuring a tight seal between the two connections. After the electrodialysis membrane stack 200 and the electrode assembly 300 are inserted into the receiving cavity 110 through the opening 151, the opening 151 is sealed by the end cap 160 to achieve a seal for the electrodialysis filter element 1000.

[0055] During the regeneration of the electrodialysis filter element 1000, the raw water flows in reverse, and the electrode wire 330 is energized in reverse, causing ion desorption and gas generation. The inlet 120 is positioned at the highest point of the inner wall of the tank 150, which facilitates the gas to be discharged from the inlet 120 with the water flow, preventing it from remaining inside the electrodialysis filter element 1000 and causing the internal temperature to rise, thus affecting its service life. The wastewater channel extends horizontally and / or vertically upward along the flow direction of the wastewater, ensuring that the gas always flows horizontally or upward, without downward flow, thereby preventing gas from flowing back into the electrodialysis filter element 1000.

[0056] The end of the barrel 150 facing away from the opening 151 is provided with an external wiring port 152 and an internal wiring port 153. The electrode wire 330 on the inner support 310 is electrically connected to an external power source via the internal wiring port 153, and the electrode wire 330 on the outer support 320 is electrically connected to an external power source via the external wiring port 152. The external wiring port 152 and the internal wiring port 153 facilitate the power connection of the electrode assembly 300. The external wiring port 152 and the internal wiring port 153 are located at the end of the barrel 150 facing away from the opening 151, which facilitates wiring and does not affect the assembly of the electrodialysis filter element 1000 or the stacking installation between multiple electrodialysis filter elements 1000.

[0057] The electrodialysis membrane stack 200 includes a central tube 210 and a membrane assembly 220 wound and fixed on the central tube 210. The two axial ends of the membrane assembly 220 are sealed and fixed by a cap 230. The central tube 210 has several water permeable holes. An inner support 310 is located inside the central tube 210, and the inner support 310 has a water outlet 312 at the end of the membrane assembly 220 away from the outlet 130.

[0058] The central tube 210 is an axially penetrating tube with several permeable holes for water to pass through. The membrane module 220 is tightly fixed to the radial outer circumference of the central tube 210, which can be achieved by adhesive bonding. The membrane module 220 is composed of multiple electrodialysis membrane sheets wound together, forming a flow channel between adjacent electrodialysis membrane sheets to allow water to flow through, thereby completing the electrodialysis adsorption or desorption of ions and regenerating the electrodialysis filter element 1000. The cap 230 is adhesively fixed to the axial end faces of the membrane module 220, achieving both the fixation of the membrane module 220 and ensuring the sealing of the end faces of the membrane module 220. This allows the raw water to flow gradually along the flow channel of the membrane module 220 after entering the electrodialysis filter element 1000, without flowing out from the ends, ensuring water production and regeneration effects. The inner support 310 has a water outlet 312 at the end of the membrane module 220 away from the outlet 130. Whether in water production or regeneration, the raw water has the longest flow path, and the ion adsorption and desorption effects are the best, which is conducive to improving the water purification and regeneration effects.

[0059] Generally, the electrodialysis membrane stack 200 has one membrane segment 240. In order to ensure the water purification effect, the electrodialysis filter element 1000 can be made longer. If there is only one membrane segment 240, the flow channel at its end is significantly narrower than the middle area, making it easy for scale to form and block at both ends during the water purification process, which reduces the service life of the electrodialysis filter element 1000.

[0060] Based on this, see Figure 4-6 The electrodialysis membrane stack 200 includes at least two membrane segments 240 extending axially along the receiving cavity 110. Each membrane segment 240 includes a central tube 210 and a membrane assembly 220 wound and fixed on the central tube 210. An inner support 310 is provided with a water inlet 312 at the end of each membrane segment 240 furthest from the outlet 130. Adjacent membrane segments 240 are connected by a support frame 250, which seals and fixes the end face of its corresponding membrane segment 240. By segmenting the electrodialysis membrane stack 200, the difference in flow channel width between the axial ends and the middle region of each membrane segment 240 is reduced. This makes the water flow velocity in different axial parts of the electrodialysis membrane stack 200 more similar during water purification, reducing the probability of scaling and clogging at the axial ends of each membrane segment 240, improving the utilization rate of the electrodialysis membrane stack 200, and ensuring the service life of the electrodialysis filter element 1000.

[0061] At least one axial end of the inner support 310 and at least one cap 230 are fixedly connected to the inner wall of the outer barrel 100, and the support frame 250 is fixedly connected to the outer support 320. For example, a limiting part 231 protrudes from the side of the cap 230 away from the electrodialysis membrane stack 200, and a first limiting groove 170 corresponding to the limiting part 231 is provided on the inner wall of the outer barrel 100. After the electrodialysis membrane stack 200 is placed in the receiving cavity 110, the limiting part 231 is engaged in the first limiting groove 170 to fix the electrodialysis membrane stack 200. A limiting end 313 protrudes from the axial end of the inner support 310 toward the inner wall of the outer barrel 100, and a second limiting groove 180 corresponding to the limiting end 313 is provided on the inner wall of the outer barrel 100. After the electrode assembly 300 is placed in the receiving cavity 110, the limiting end 313 is engaged in the corresponding second limiting groove 180 to fix the inner support 310. The support frame 250 is bonded and fixed to the end face of the corresponding membrane segment 240, and the support frame 250 is fixedly connected to the outer support 320. Thus, the outer support 320 can be fixed by means of the fixing effect of the electrodialysis membrane stack 200, so that the electrode assembly 300 can be installed stably.

[0062] In addition, see Figure 9 The installation cavity also includes a horizontally placed pre-filter 2, which is stacked vertically with at least two electrodialysis filter cartridges 1000. The inlet and regeneration channels on the water circuit board are connected to the raw water channel 1 via the pre-filter 2, and the pre-filter 2 can be directly connected to the outlet channel on the water circuit board. The pre-filter 2 can be used to remove microorganisms, large particulate matter, etc. from the raw water. In cases where water quality requirements are not high, such as for cooking and washing, the raw water filtered by the pre-filter 2 can be used directly.

[0063] In this invention, the water production rates of at least two electrodialysis filter cartridges 1000 are set with a gradient difference A. Under water production conditions, when the difference is less than A, the raw water channel 1 connects to the inlet channel on the water circuit board corresponding to the electrodialysis filter cartridge 1000 with the lower water production rate. A can be 20%, 25%, 30%, 35%, 40%, 45%, 50%, etc., and can be calculated by detecting the water production rate of each electrodialysis filter cartridge 1000 using a flow meter 3. Setting the water production rate difference ensures that at least one electrodialysis filter cartridge 1000 can produce water normally during regeneration of any electrodialysis filter cartridge 1000, thus achieving uninterrupted water supply to the user from the electrodialysis filtration device. When the difference in water production is less than A, the raw water flows through the electrodialysis filter cartridge 1000 with a lower water production capacity and is then discharged to ensure that the difference in water production can be restored to A. This ensures that when the electrodialysis filter cartridge 1000 with a lower water production capacity is regenerated, other electrodialysis filter cartridges 1000 have a suitable water production capacity to stably produce water for users.

[0064] Based on the above structure, combined with Figure 9 and Figure 10The water circuit system and working principle of the electrodialysis filtration device of this utility model are described in detail using two and three electrodialysis filter cartridges 1000 as examples. The principle of other numbers of electrodialysis filter cartridges 1000 is the same, and will not be repeated here.

[0065] See Figure 10 The electrodialysis filter element 1000 includes a first electrodialysis filter element 4 and a second electrodialysis filter element 5 arranged in parallel and vertically stacked. The first electrodialysis filter element 4 and the second electrodialysis filter element 5 are connected to the raw water channel 1 through a first water inlet channel 7 and a second water inlet channel 8 on a water circuit board, respectively. One end of the raw water channel 1 is connected to raw water, and the other end of the raw water channel 1 is connected to one end of the first water inlet channel 7 and one end of the second water inlet channel 8 through a first three-way valve 10. The other end of the first water inlet channel 7 is connected to the inlet 120 of the first electrodialysis filter element 4, and a second three-way valve 11 is provided on the first water inlet channel 7 to connect to the first wastewater channel 12. The other end of the second water inlet channel 8 is connected to the inlet 120 of the second electrodialysis filter element 5, and a third three-way valve 13 is provided on the second water inlet channel 8 to connect to the second wastewater channel 14.

[0066] The other end of the raw water channel 1 is connected to one end of the first regeneration channel 18 via a first three-way valve 10. The other end of the first regeneration channel 18 is connected to the outlet 130 of the first electrodialysis filter element 4. A sixth three-way valve 19 is installed on the first regeneration channel 18 to connect to one end of the first outlet channel 20. The second inlet channel 8 is also connected to one end of the second regeneration channel 21 via a fourth three-way valve 15. The other end of the second regeneration channel 21 is connected to the outlet 130 of the second electrodialysis filter element 5. A seventh three-way valve 22 is installed on the second regeneration channel 21 to connect to one end of the second outlet channel 23. A pre-filter element 2 is installed on the raw water channel 1. The first inlet channel 7 is connected to the fourth outlet channel 28 near the first three-way valve 10. The No. 2 outlet channel 23 is equipped with a No. 10 three-way valve 29, which can merge with the No. 4 outlet channel 28 and then converge with the No. 1 outlet channel 20 at the four-way valve 31 to discharge water through the main outlet channel 32. Alternatively, the No. 1 outlet channel 20 and the No. 2 outlet channel 23 can be connected through the four-way valve 31.

[0067] Flow meters 3 are installed on raw water channel 1, No. 1 outlet channel 20 and No. 2 outlet channel 23. TDS meters 34 are installed on raw water channel 1, main outlet channel 32, No. 1 wastewater channel 12 and No. 2 wastewater channel 14. In the direction of raw water flow, the pre-filter 2 on raw water channel 1 is located after the TDS meter 34.

[0068] The working principle is as follows:

[0069] There is a water production difference A between the No. 1 electrodialysis filter cartridge 4 and the No. 2 electrodialysis filter cartridge 5, which can be 20%, 25%, 30%, 35%, 40%, 45%, 50%, etc.

[0070] If only the No. 1 electrodialysis filter cartridge 4 produces water, the raw water is initially filtered by the pre-filter cartridge 2 on the raw water channel 1, and then enters the No. 1 inlet channel 7 on the water circuit board through the No. 1 three-way valve 10. After flowing through the No. 2 three-way valve 11, it enters the No. 1 electrodialysis filter cartridge 4 through the corresponding inlet 120 to produce pure water by adsorbing ions. After obtaining pure water, it flows out through the outlet 130, and then flows through the No. 1 regeneration channel 18, the No. 6 three-way valve 19, the No. 1 outlet channel 20, the four-way valve 31 and the main outlet channel 32 on the water circuit board to the external water outlet device for user use. If only the No. 2 electrodialysis filter cartridge 5 produces water, the raw water, after initial filtration by the pre-filter cartridge 2 on the raw water channel 1, enters the No. 2 inlet channel 8 on the water circuit board through the No. 1 three-way valve 10. It then flows through the No. 4 three-way valve 15 and the No. 3 three-way valve 13, and finally enters the No. 2 electrodialysis filter cartridge 5 through the corresponding inlet 120 to adsorb ions and produce pure water. The purified water then flows out through the outlet 130, and then through the No. 2 regeneration channel 21, the No. 7 three-way valve 22, the No. 2 outlet channel 23, the No. 10 three-way valve 29, the four-way valve 31, and the main outlet channel 32 on the water circuit board to reach the external water outlet device for user use. If both the No. 1 electrodialysis filter cartridge 4 and the No. 2 electrodialysis filter cartridge 5 produce water, simply open the corresponding water circuit. The flow meter is used to detect the flow rate of the raw water channel 1, the No. 1 outlet channel 20, and the No. 2 outlet channel 23 to control the water production difference A.

[0071] During the regeneration of the No. 1 electrodialysis filter cartridge 4, in the early stage of regeneration, the raw water is initially filtered by the pre-filter cartridge 2 on the raw water channel 1, then enters the No. 1 regeneration channel 18 on the water circuit board through the No. 1 three-way valve 10. It then flows through the No. 6 three-way valve 19 and enters the No. 1 electrodialysis filter cartridge 4 through the corresponding outlet 130 to obtain wastewater after ion desorption. The wastewater then flows out through the inlet 120 and is discharged through the No. 1 inlet channel 7, the No. 2 three-way valve 11, and the No. 1 wastewater channel 12 on the water circuit board until the ions adsorbed in the No. 1 electrodialysis filter cartridge 4 are basically desorbed. If the user needs water at this time, the water purification circuit of the No. 2 electrodialysis filter cartridge 5 can be opened to produce pure water for the user. At the end of the regeneration period, the supply of raw water to the No. 1 electrodialysis filter cartridge 4 is stopped. Instead, the No. 2 electrodialysis filter cartridge 5 is used to produce water. After the raw water is initially filtered by the pre-filter cartridge 2 on the raw water channel 1, it enters the No. 2 inlet channel 8 on the water circuit board through the No. 1 three-way valve 10. After flowing through the No. 4 three-way valve 15 and the No. 3 three-way valve 13, it enters the No. 2 electrodialysis filter cartridge 5 through the corresponding inlet 120 to produce pure water by adsorbing ions. The pure water then flows out through the outlet 130 and then flows through the water circuit board. The No. 2 regeneration channel 21, No. 7 three-way valve 22, No. 2 outlet channel 23, No. 10 three-way valve 29, and four-way valve 31 on the water circuit board allow water to enter the No. 1 electrodialysis filter element 4 through the No. 1 outlet channel 20 and No. 6 three-way valve 19, and then flow out through the inlet 120. The water is then discharged through the No. 1 inlet channel 7, No. 2 three-way valve 11, and No. 1 wastewater channel 12 on the water circuit board, thus completing the regeneration of the No. 1 electrodialysis filter element 4. If the user needs water during the rinsing process, the pure water produced by the No. 2 electrodialysis filter element 5 can be diverted at the four-way valve 31 and flow through the main outlet channel 32 to the external water outlet device for user use. The regeneration principle of the No. 2 electrodialysis filter element 5 is the same. The TDS meter 34 can be used to test the raw water quality, effluent water quality, and wastewater quality to determine whether the water quality is usable and meets discharge standards.

[0072] Furthermore, when the water quality requirements are not high, such as for cooking and washing, the raw water, after being filtered by the pre-filter 2 on the raw water channel 1, can flow to the external water outlet device for user use through the No. 1 three-way valve 10, the No. 4 water outlet channel 28, the No. 10 three-way valve 29, the four-way valve 31 and the main water outlet channel 32.

[0073] See Figure 9The electrodialysis filter element 1000 includes three electrodialysis filter elements: a first electrodialysis filter element 4, a second electrodialysis filter element 5, and a third electrodialysis filter element 6, arranged in parallel and vertically stacked. These three filter elements are connected to the raw water channel 1 via a first water inlet channel 7, a second water inlet channel 8, and a third water inlet channel 9 on a water circuit board, respectively. One end of the raw water channel 1 is connected to raw water, and the other end is connected to one end of the first water inlet channel 7 and one end of the second water inlet channel 8 via a first three-way valve 10. The other end of the first water inlet channel 7 is connected to the inlet 120 of the first electrodialysis filter element 4, and a second three-way valve 11 is provided on the first water inlet channel 7 to connect to the first wastewater channel 12. The other end of the second water inlet channel 8 is connected to the inlet 120 of the second electrodialysis filter element 5, and the second water inlet channel 8 is equipped with a third three-way valve 13 to connect to the second wastewater channel 14. The second water inlet channel 8 is also equipped with a fourth three-way valve 15 to connect to one end of the third water inlet channel 9, the other end of the third water inlet channel 9 is connected to the inlet 120 of the third electrodialysis filter element 6, and the third water inlet channel 9 is equipped with a fifth three-way valve 16 to connect to the third wastewater channel 17.

[0074] The other end of the raw water channel 1 is also connected to one end of the first regeneration channel 18 via a first three-way valve 10. The other end of the first regeneration channel 18 is connected to the outlet 130 of the first electrodialysis filter element 4. The first regeneration channel 18 is equipped with a sixth three-way valve 19 to connect to one end of the first outlet channel 20. The second inlet channel 8 is also connected to one end of the second regeneration channel 21 via a fourth three-way valve 15. The other end of the second regeneration channel 21 is connected to the outlet 130 of the second electrodialysis filter element 5. The second regeneration channel 21 is equipped with a seventh three-way valve 22 to connect to one end of the second outlet channel 23. A No. 8 three-way valve 24 is located near the No. 4 three-way valve 15 in the No. 3 inlet channel 9. The No. 3 inlet channel 9 is connected to one end of the No. 3 regeneration channel 25 through the No. 8 three-way valve 24. The other end of the No. 3 regeneration channel 25 is connected to the outlet 130 of the No. 3 electrodialysis filter cartridge 6. A No. 9 three-way valve 26 is located on the No. 3 regeneration channel 25 to connect to one end of the No. 3 outlet channel 27. A pre-filter cartridge 2 is located on the raw water channel 1. The No. 4 outlet channel 28 is connected to the No. 1 inlet channel 7 near the No. 1 three-way valve 10. The No. 2 outlet channel 23 and the No. 3 outlet channel 27 are respectively equipped with a No. 10 three-way valve 29 and a No. 11 three-way valve 30. They can merge with the No. 4 outlet channel 28 and converge with the No. 1 outlet channel 20 at the four-way valve 31 to discharge water through the main outlet channel 32. Alternatively, they can connect the No. 1 outlet channel 20, the No. 2 outlet channel 23 and the No. 3 outlet channel 27 through the No. 12 three-way valve 33.

[0075] Flow meters 3 are installed on raw water channel 1, No. 1 outlet channel 20, No. 2 outlet channel 23 and No. 3 outlet channel 27. TDS meters 34 are installed on raw water channel 1, main outlet channel 32, No. 1 wastewater channel 12, No. 2 wastewater channel 14 and No. 3 wastewater channel 17. In the direction of raw water flow, the pre-filter 2 on raw water channel 1 is located after the TDS meter 34.

[0076] The working principle is as follows:

[0077] There is a water production difference A between the No. 1 electrodialysis filter cartridge 4, the No. 2 electrodialysis filter cartridge 5, and the No. 3 electrodialysis filter cartridge 6, which can be 20%, 25%, 30%, 35%, 40%, 45%, 50%, etc.

[0078] If only the No. 1 electrodialysis filter cartridge 4 produces water, the raw water is initially filtered by the pre-filter cartridge 2 on the raw water channel 1, and then enters the No. 1 inlet channel 7 on the water circuit board through the No. 1 three-way valve 10. After flowing through the No. 2 three-way valve 11, it enters the No. 1 electrodialysis filter cartridge 4 through the corresponding inlet 120 to produce pure water by adsorbing ions. After obtaining pure water, it flows out through the outlet 130, and then flows through the No. 1 regeneration channel 18, the No. 6 three-way valve 19, the No. 1 outlet channel 20, the four-way valve 31 and the main outlet channel 32 on the water circuit board to the external water outlet device for user use. If only the No. 2 electrodialysis filter cartridge 5 produces water, the raw water is initially filtered by the pre-filter cartridge 2 on the raw water channel 1, and then enters the No. 2 inlet channel 8 on the water circuit board through the No. 1 three-way valve 10. After flowing through the No. 4 three-way valve 15 and the No. 3 three-way valve 13, it enters the No. 2 electrodialysis filter cartridge 5 through the corresponding inlet 120 to produce pure water by adsorbing ions. After obtaining pure water, it flows out through the outlet 130, and then flows through the No. 2 regeneration channel 21, the No. 7 three-way valve 22, the No. 2 outlet channel 23, the No. 10 three-way valve 29, the No. 11 three-way valve 30, the four-way valve 31 and the main outlet channel 32 on the water circuit board to the external water outlet device for user use. If only the No. 3 electrodialysis filter cartridge 6 produces water, the raw water is initially filtered by the pre-filter cartridge 2 on the raw water channel 1, then enters the No. 2 inlet channel 8 on the water circuit board through the No. 1 three-way valve 10, and then enters the No. 3 inlet channel 9 through the No. 4 three-way valve 15. After flowing through the No. 8 three-way valve 24 and the No. 5 three-way valve 16, it enters the No. 3 electrodialysis filter cartridge 6 through the corresponding inlet 120 to produce pure water by adsorbing ions. After obtaining pure water, it flows out through the outlet 130, and then flows through the No. 3 regeneration channel 25, the No. 9 three-way valve 26, the No. 3 outlet channel 27, the No. 11 three-way valve 30, the four-way valve 31 and the main outlet channel 32 on the water circuit board to the external water outlet device for user use. If both electrodialysis filter cartridge 4 (No. 1) and electrodialysis filter cartridge 5 (No. 2) produce water, or both electrodialysis filter cartridge 4 (No. 1) and electrodialysis filter cartridge 6 (No. 3) produce water, or both electrodialysis filter cartridge 5 (No. 2) and electrodialysis filter cartridge 6 (No. 3) produce water, or both electrodialysis filter cartridges 4 (No. 1), 5 (No. 2), and 6 (No. 3) produce water, then the corresponding water circuit should be turned on. The flow meter is used to detect the flow rate of raw water channel 1, outlet channel 20 (No. 1), outlet channel 23 (No. 2), and outlet channel 27 (No. 3) to control the water production difference A.

[0079] During the regeneration of electrodialysis filter cartridge 4, in the early stage of regeneration, the raw water is initially filtered by the pre-filter cartridge 2 on the raw water channel 1, then enters the first regeneration channel 18 on the water circuit board through the first three-way valve 10. It then flows through the sixth three-way valve 19 and enters the first electrodialysis filter cartridge 4 through the corresponding outlet 130 to obtain wastewater after ion desorption. The wastewater then flows out through the inlet 120 and is discharged through the first inlet channel 7, the second three-way valve 11, and the first wastewater channel 12 on the water circuit board until the ions adsorbed in the first electrodialysis filter cartridge 4 are basically desorbed. If the user needs water at this time, the water production circuit of the second electrodialysis filter cartridge 5 and / or the third electrodialysis filter cartridge 6 can be opened to produce pure water for the user. In the final stage of regeneration, the supply of raw water to the first electrodialysis filter cartridge 4 is stopped, and instead, the second electrodialysis filter cartridge 5 and / or the third electrodialysis filter cartridge 6 produce water. Taking the water production process of the No. 2 electrodialysis filter cartridge 5 as an example, after the raw water is initially filtered by the pre-filter cartridge 2 on the raw water channel 1, it enters the No. 2 inlet channel 8 on the water circuit board through the No. 1 three-way valve 10. After flowing through the No. 4 three-way valve 15 and the No. 3 three-way valve 13, it enters the No. 2 electrodialysis filter cartridge 5 through the corresponding inlet 120 to produce pure water by adsorbing ions. After obtaining pure water, it flows out through the outlet 130, and then flows through the No. 2 regeneration channel 21 and the No. 7 three-way valve on the water circuit board. Valve 22, outlet channel 23, three-way valve 29, three-way valve 30, and four-way valve 31 flow into the first electrodialysis filter element 4 via outlet channel 20 and three-way valve 19, through the corresponding outlet 130. After rinsing, the water flows out through inlet 120 and then through inlet channel 7, three-way valve 11, and wastewater channel 12 on the water circuit board, thus completing the regeneration of the first electrodialysis filter element 4. If the user needs water during the rinsing process, the pure water produced by the second electrodialysis filter element 5 can be diverted at four-way valve 31 and flow through the main outlet channel 32 to the external water outlet device for user use. The regeneration principle of the second electrodialysis filter element 5 and the third electrodialysis filter element 6 is the same. The TDS meter 34 can be used to test the raw water quality, effluent water quality, and wastewater quality to determine whether the water quality is usable and meets the discharge standards.

[0080] Furthermore, when the water quality requirements are not high, such as for cooking and washing, the raw water, after being filtered by the pre-filter 2 on the raw water channel 1, can flow to the external water outlet device for user use through the No. 1 three-way valve 10, the No. 4 water outlet channel 28, the No. 11 three-way valve 30, the four-way valve 31 and the main water outlet channel 32.

[0081] In addition, this utility model also provides a water purifier, including: the above-mentioned electrodialysis filtration device.

[0082] This water purifier features a well-organized internal layout with clearly defined water and electrical circuits. Its compact size facilitates easy installation and allows for a wide range of installation locations. Furthermore, at least one electrodialysis filter cartridge 1000 is always operational, ensuring uninterrupted water production to meet the user's needs at any time. During regeneration, the electrodialysis filter cartridge 1000 utilizes a large amount of raw water and reverse-current electrolysis to desorb ions, combined with a small amount of purified water rinsing. The amount of purified water used during regeneration is minimal, resulting in a virtually imperceptible reduction in flow rate. This seamless regeneration not only ensures a superior user experience and avoids excessive waste of purified water but also helps reduce the purifier's energy consumption.

[0083] Furthermore, the water circuit and electrical circuit of each electrodialysis filter element 1000 in the water purifier of this utility model are independently controlled, which can flexibly realize water production and regeneration.

[0084] The technical means disclosed in this utility model are not limited to those disclosed in the above embodiments, but also include technical solutions composed of any combination of the above technical features. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of this utility model, and these improvements and modifications are also considered within the scope of protection of this utility model.

Claims

1. An electrodialysis filtration device, characterized in that, include: A housing, wherein the interior of the housing is provided with a mounting cavity; At least two electrodialysis filter elements are arranged horizontally and stacked in parallel in the mounting cavity, and each of the electrodialysis filter elements is provided with an inlet and an outlet. A water channel plate is vertically disposed in the mounting cavity and located on the transverse side of the electrodialysis filter element. The water channel plate is provided with an inlet channel and an outlet channel for each electrodialysis filter element to connect to the corresponding inlet and outlet, and the outlet channels are interconnected. The water circuit board is also provided with a regeneration channel and a wastewater channel for each of the electrodialysis filter elements to be connected to the corresponding water outlet and water inlet, respectively. Both the water inlet channel and the regeneration channel are connected to the raw water channel.

2. The electrodialysis filtration device according to claim 1, characterized in that: The electrodialysis filter element includes an outer barrel, an electrodialysis membrane stack, and an electrode assembly. The outer barrel has an internal cavity. The inlet and outlet are both located at the axial end of the outer barrel near the water circuit board and communicate with the cavity. The electrodialysis membrane stack and the electrode assembly are coaxially arranged within the cavity. A gap is provided between the electrodialysis membrane stack and the inner wall of the outer barrel, communicating with the inlet. The electrode assembly includes an inner support disposed within the electrodialysis membrane stack, an outer support disposed outside the electrodialysis membrane stack, and electrode wires wound on the inner support and the outer support. The inner support has an axially extending channel that communicates with the outlet, and the inner support has a water outlet corresponding to the electrodialysis membrane stack that communicates with the channel.

3. The electrodialysis filtration device according to claim 2, characterized in that: The outer barrel includes a barrel body with the receiving cavity inside. One axial end of the barrel body has an opening that communicates with the receiving cavity. An end cap is detachably installed at the opening of the barrel body to open or close the receiving cavity. The water inlet and the water outlet are located at the ends of the barrel body opposite to the opening, and the water inlet is located at the highest point of the inner wall of the barrel body. The wastewater channel extends laterally and / or vertically upward along the flow direction of the wastewater.

4. The electrodialysis filtration device according to claim 3, characterized in that: The end of the barrel facing away from the opening is provided with an external wiring port and an internal wiring port. The electrode wire on the inner support is electrically connected to an external power source via the internal wiring port, and the electrode wire on the outer support is electrically connected to an external power source via the external wiring port.

5. The electrodialysis filtration device according to claim 2, characterized in that: The electrodialysis membrane stack includes a central tube and a membrane assembly wound and fixed on the central tube. The axial end faces of the membrane assembly are sealed and fixed by a cap. The central tube has several water permeable holes. The inner support is located inside the central tube, and the inner support has a water outlet at the end of the membrane assembly away from the outlet.

6. The electrodialysis filtration device according to claim 5, characterized in that: The electrodialysis membrane stack includes at least two membrane segments extending axially along the receiving cavity. Each membrane segment includes the central tube and the membrane assembly wound and fixed on the central tube. The inner support is provided with the water outlet at the end of each membrane segment away from the outlet. The two adjacent membrane segments are connected by a support frame, and the support frame seals and fixes the end face of the corresponding membrane segment.

7. The electrodialysis filtration device according to claim 6, characterized in that: At least one axial end of the inner support and at least one of the caps are fixedly connected to the inner wall of the outer barrel, and the support frame is fixedly connected to the outer support.

8. The electrodialysis filtration device according to any one of claims 1-7, characterized in that: The installation cavity is also provided with a pre-filter element that is placed horizontally and stacked vertically with at least two of the electrodialysis filter elements. The water inlet channel and the regeneration channel on the water circuit board are connected to the raw water channel via the pre-filter element, and the pre-filter element can be directly connected to the water outlet channel on the water circuit board.

9. The electrodialysis filtration device according to any one of claims 1-7, characterized in that: The water production capacity of at least two of the electrodialysis filter cartridges is set with a gradient of difference A. Under water production conditions and when the difference is less than A, the raw water channel is connected to the water inlet channel on the water circuit board corresponding to the electrodialysis filter cartridge with the lower water production capacity.

10. A water purifier, characterized in that, include: The electrodialysis filtration apparatus according to any one of claims 1-9.

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