Filter element and intelligent water purifier

Abstract

The utility model discloses a filter element, an intelligent water purifier and a backwashing method of the intelligent water purifier, the filter element comprises a shell, a filter membrane assembly and a positioning terminal, and the positioning terminal abuts against and prevents the inlet end face of the filter membrane assembly from being extruded by reverse water flow to move, twist, deform and damage; the intelligent water purifier comprises a controller, a filter element, a purified water pressure tank, an electromagnetic valve and a water pump, the water pump presses raw water or seawater into the filter element for purification, and produced purified water is pressed into the purified water pressure tank; the filter element backwashing method further comprises a high-pressure switch, a pollution discharge throttle valve and a pollution discharge electromagnetic valve, the high-pressure switch triggers the controller to open the pollution discharge electromagnetic valve, and sewage is discharged through the pollution discharge throttle valve, so that purified water released by the purified water pressure tank is divided into two paths to appropriately flow back to the backwashing filter element. According to the intelligent water purifier, the filter element and the method for backwashing the filter element, the effects of saving water and reducing emission can be achieved, the purpose that the filter element can filter for a long time and does not need to be replaced is achieved, consumption of the multi-stage filter element is reduced, and the problem of peculiar smell caused by a traditional dirt hiding and containing filtering mode is solved.

Description

Technical Field

[0001] The utility model belongs to the technical field of water purifiers, and particularly relates to a filter element, an intelligent water purifier and a backwashing method thereof. Background Art

[0002] A direct drinking machine or water purifier filters tap water, well water, river water, or sea water (hereinafter referred to as raw water) through a variety of filters to absorb dirt and foreign matter. The water is then filtered through an RO reverse osmosis filter to purify and separate the concentrated water and produce purified water (hereinafter referred to as purified water). The purified water meets food hygiene standards and can be drunk directly.

[0003] Existing water purifiers have technical deficiencies: First, due to the accumulation of foreign matter on various filter elements during initial filtration and separation, they gradually adhere to the RO reverse osmosis filter element, hindering the separation of water production, resulting in a decreasing water production ratio, prolonging the discharge of wastewater during forward flushing, and wasting water resources. If the filter element is not replaced and discarded in time, the water purifier will be blocked and scrapped; Second, because the filter element has been harboring dirt and grime for a long time, it will ferment and produce odor. The existing technology uses activated carbon filter elements for adsorption, but the water flows through the activated carbon rapidly and does not get proper time to soak. The adsorption capacity is extremely limited, and the post-activated carbon is prone to breeding bacteria for secondary pollution; Third, the selective replacement of discarded filter elements wastes resources and is harmful to the environment; Fourth, filter elements at different levels are accompanied by different brands, different water sources and different water consumption. The replacement period is difficult to determine, which is inconvenient for consumers to replace, and the uncertainty will also lead to health and safety risks; Fifth 1. Existing commercial water purifiers are limited by their shape and simple structure, and cannot filter and desalinate seawater; 2. Existing RO filter elements are limited by the size of water purifier products, making it difficult to upgrade their capacity. The flow rate is generally very small and cannot meet the needs of quick water discharge in home life; 3. The filter membrane of the existing reverse osmosis RO filter element will move and deform with the direction of the water flow when encountering reverse high-pressure water flow, and the reverse back pressure will also expand and squeeze the filter membrane from the inside to the outside. Backwashing the filter element will cause irreversible damage and leakage of the filter element; 4. The technology of existing backwash filter elements adopts manual or computer-timed automatic backwashing, which is a static mechanical timed backwashing solution. It cannot completely solve the problem of reverse back pressure damaging the filter element. For non-time patterns and different scenarios, the timed return of backwash purified water is wasteful, which reduces the overall water production efficiency of the water purifier, resulting in the inability of seawater purification equipment to be miniaturized and expanded into a water purifier product. Utility Model Content

[0004] The purpose of this application is to provide an intelligent water purifier, filter element and backwashing method thereof, improve the RO filter element into a structure that combines primary filtration and purification separation, can withstand high-pressure water flow forward filtration and backwashing, and adopt a controller to automatically control the raw water filtration and purification process and intelligently control the clean water return backwashing process. The technical solution allows the clean water produced by the water purifier to return to the filter element for backwashing in a timely manner according to actual needs.

[0005] In the first aspect, the present application provides a filter element, including a shell, a central tube, a filter membrane assembly, a sealing ring and a positioning terminal. The shell is in the shape of a bottle, with a concentrated water outlet and a clean water outlet at one end of the bottom and a water inlet at the other end. The central tube includes a water inlet pipe and a water outlet pipe that are connected together. The water inlet pipe and the water outlet pipe are separated and not connected. The mouth of the water inlet pipe abuts the water inlet of the shell, and the mouth of the water outlet pipe abuts the clean water outlet of the shell. The wall of the water inlet pipe is provided with a water inlet hole, and the wall of the water outlet pipe is provided with a plurality of water filtration holes. The filter membrane assembly includes a filter membrane bag and a support net The filter membrane bag opening is connected to the water outlet pipe, the support net overlaps with the filter membrane bag and abuts the outer wall of the central tube to form a cylindrical shape, the sealing ring is arranged between the cylindrical filter membrane assembly and the inner wall of the shell, the positioning terminal comprises an outer tube, an inner tube and a plurality of support plates, one side of the support plate is connected to the inner wall of the outer tube, and the other side is connected to the outer wall of the inner tube, the inner tube of the positioning terminal is sleeved with the water inlet pipe, one end of the outer tube is movably abutted against the inner wall of the shell, and the other end is movably abutted against the inlet end face of the filter membrane assembly, the outer diameter of the outer tube is larger than the inner diameter of the sealing ring and smaller than the outer diameter of the sealing ring.

[0006] In combination with the first aspect, the raw water entering the water inlet pipe passes through the positioning terminal, passes through the inlet end face of the filter membrane assembly and the vicinity of the support net, and foreign matter in the raw water is filtered to form a dynamic foreign matter filter retention, and then passes through the filter membrane assembly to separate ions, bacteria and viruses to form concentrated water, and permeates through the filter membrane bag under reverse osmosis pressure to purify and produce clean water. The produced clean water enters the water filter hole and is pressed into the clean water pressure tank through the pipeline of the water outlet pipe, and the separated concentrated water is output through the concentrated water outlet; the clean water returning from the clean water pressure tank backwashes the filter membrane assembly, and the outer tube of the positioning terminal abuts the end face of the filter membrane assembly, which can prevent the end face of the filter membrane assembly from being squeezed in the reverse water flow direction, and prevent the inlet end face from being twisted, moved, deformed and damaged from a normal flat shape to a concave shape. The outer tube of the positioning terminal can also prevent the sealing ring from being squeezed and moved in the reverse water flow direction, and prevent the sealing ring from slipping off the inlet end face of the filter membrane assembly.

[0007] In a second aspect, the present application provides an intelligent water purifier, comprising the filter element described in the first aspect, and further comprising:

[0008] a purified water pressure tank, connected to the water outlet pipe of the filter element;

[0009] A clean water pressure switch, connected between the water outlet pipe and the clean water pressure tank;

[0010] A clean water check valve, the water inlet end of which is connected between the clean water pressure tank and the concentrated water outlet;

[0011] a concentrated water solenoid valve connected to the concentrated water outlet;

[0012] a concentrated water throttle valve connected between the concentrated water solenoid valve and the concentrated water outlet;

[0013] Water supply solenoid valve, connected to the water supply port;

[0014] a water pump connected between the water supply solenoid valve and the water inlet pipe;

[0015] A sewage throttle valve is connected to the water outlet of the sewage solenoid valve, or is connected between the water inlet of the sewage solenoid valve and the water inlet pipe of the filter element;

[0016] A sewage discharge solenoid valve, the water inlet end of which is connected to the connecting pipe between the water inlet of the filter element and the water outlet end of the water pump;

[0017] a pressure reducing valve connected between the purified water pressure switch and the water outlet pipe of the filter element;

[0018] A backflow check valve, the water inlet end of the backflow check valve is connected to the water outlet pipe of the filter element, the water outlet end of the backflow check valve is connected to the purified water pressure switch, and the backflow check valve is connected in parallel with the pressure reducing valve;

[0019] The controller controls the purification process and the backwash process.

[0020] In combination with the second aspect, a further scheme, the purification process includes: the raw water entering the water supply solenoid valve is purified by the filter element, the produced pure water flows out from the clean water outlet, passes through the reflux check valve and is pressed into the clean water pressure tank, the separated concentrated water flows out from the concentrated water outlet, passes through the concentrated water throttle valve and is output through the concentrated water solenoid valve.

[0021] In combination with the second aspect, in a further solution, the backwash process includes a quantitative automatic backwash process and a dynamic intelligent backwash process.

[0022] In combination with the second aspect, a further solution also includes a clean water pressure switch, which is connected between the clean water outlet pipe and the clean water pressure tank. The quantitative automatic backwash process includes: when the clean water produced by the purification process is pressed into the clean water pressure tank to reach the rated capacity, the clean water pressure switch reaches the rated pressure value to shut down the water supply solenoid valve and the concentrated water solenoid valve, and triggers the controller to power on the sewage solenoid valve to open and discharge sewage, so that the clean water pressure tank releases high-pressure clean water into two paths to reflux backwash the filter element.

[0023] In combination with the second aspect, a further solution also includes a pressure-stabilizing valve, which is connected to the connecting pipeline between the water inlet of the filter element and the water outlet of the water pump, and a sewage pressure switch, which is connected to the water outlet of the pressure-stabilizing valve. The dynamic intelligent backwash process includes: raw water is gradually pressed into the filter element, so that the retained ion concentration and the density of foreign matter in the filter membrane assembly gradually increase, and the resistance gradually increases, causing the pressure of the sewage pressure switch to rise to the rated pressure value to connect the circuit, shut down the water supply solenoid valve and the concentrated water solenoid valve, and trigger the controller to energize the sewage solenoid valve to open and discharge sewage, so that the clean water pressure tank releases high-pressure clean water into two paths to reflux backwash the filter element.

[0024] In combination with the second aspect, a further solution includes a concentrated water utilization pipeline, which includes a concentrated water pressure switch, a concentrated water pressure tank and a concentrated water check valve. The concentrated water pressure switch and the concentrated water pressure tank are arranged on the pipeline at the water outlet end of the concentrated water solenoid valve, the water inlet end of the concentrated water check valve is connected to the pipeline of the auxiliary water outlet end of the filter element, the water outlet end of the concentrated water check valve is connected to the pipeline of the water inlet end of the concentrated water solenoid valve, and the circuits of various types of pressure switches and solenoid valves are connected to the automatic controller.

[0025] In combination with the second aspect, a further solution also includes a repeated filtration pipeline, and the components of the repeated filtration pipeline include: a post-stage filter element, a post-stage concentrated water solenoid valve, a post-stage concentrated water throttling valve, a post-stage clean water check valve, a post-stage return water check valve, a post-stage pressure reducing valve, a post-stage clean water pressure switch and a post-stage clean water pressure tank. The repeated filtration pipeline components and the first-stage filtration pipeline components are connected in the same way, and the water inlet of the post-stage filter element is connected to the output pipeline of the first-stage clean water outlet pipe.

[0026] In combination with the second aspect, a further solution also includes a repeated filtration pipeline, which also includes a rear-stage water pump and a reflux solenoid valve. The water inlet end of the reflux solenoid valve is connected in parallel with the water outlet end of the rear-stage water pump. One end of the parallel connection is connected to the water inlet pipe of the rear-stage filter element, and the other end of the parallel connection is connected to the output pipeline of the first-stage clean water outlet pipe. The components of the repeated filtration pipeline also include: a rear-stage filter element, a rear-stage concentrated water solenoid valve, a rear-stage concentrated water throttle valve, a rear-stage clean water check valve, a rear-stage pressure reducing valve and a rear-stage clean water pressure tank. The repeated filtration pipeline components and the first-stage filtration pipeline components are connected in the same way.

[0027] In a third aspect, the present application provides a backwashing method applicable to the intelligent water purifier of the second aspect, wherein the backwashing filter element method includes quantitative backwashing and dynamic intelligent backwashing, and further includes the following steps:

[0028] The controller is triggered by the water purification pressure switch or the sewage discharge pressure switch to shut down the water pump, water supply solenoid valve and concentrated water solenoid valve, and the sewage discharge solenoid valve is opened to discharge sewage, so that the purified water is released from the water purification pressure tank and divided into two return flows.

[0029] Among them, one path of clean water is blocked by the return water check valve and introduced into the pressure reducing valve, passes through the clean water outlet of the filter element, passes through the outlet pipe, and reversely enters the inner wall of the filter membrane bag to penetrate and dissolve the adsorbed ionic foreign matter, and carries the ionic foreign matter back to the gap of the support net.

[0030] The other clean water flows through the clean water check valve in reverse direction into the concentrated water outlet, enters the gap of the support net and reaches the outer wall of the filter membrane bag. The water flows from the outer wall and the inner wall of the filter membrane bag converge at the gap of the support net.

[0031] The foreign matter retained in the filter membrane assembly is dissolved and removed in all directions, and the water inlet of the filter element is output through the sewage throttle valve.

[0032] The sewage throttle valve cooperates with the pressure reducing valve to control the internal pressure of the reverse water flow on the inner wall of the filter membrane bag and the external pressure of the reverse water flow on the outer wall of the filter membrane bag, so as to maintain a stable balance between the pressure of the inner and outer water flows in the flowing state, and avoid the inner pressure being greater than the external pressure, which may cause the filter membrane bag to expand outward and be damaged.

[0033] The sewage is output through the sewage discharge solenoid valve, and when the dirt is completely removed, the controller closes the sewage discharge solenoid valve in a timely manner.

[0034] In summary, this application has at least one of the following beneficial technical effects:

[0035] 1. The filter element of the present application adopts a technical solution of improving the filter element by using a positioning terminal. The positioning terminal is a hollow structure that can pass water back and forth to the filter element in both forward and reverse directions. The positioning terminal abuts the inlet end face of the filter membrane assembly to prevent the filter membrane assembly from being squeezed and twisted in the direction of the reverse high-pressure water flow, thereby avoiding the end face of the filter membrane assembly from being twisted and deformed from a normal planar shape to a concave shape and being damaged. The outer tube of the positioning terminal can also prevent the sealing ring from moving with the reverse high-pressure water flow and sliding out of the inlet end face of the filter membrane assembly, thereby avoiding leakage and damage to the filter element caused by backwashing. A filter element that combines filtration and separation is adopted, replacing the combination of primary filtration and fine filtration of a multi-stage filter element, avoiding the problem of multi-stage filtration methods that harbor dirt and dirt and the problem of frequent replacement of activated carbon to absorb odors, thereby saving the consumption of multi-stage filter elements.

[0036] 2. The intelligent water purifier of this application adopts a controller to automatically control the forward purification process of raw water. When the water pressure tank is short of water, the water pressure of the pipeline connected to the water outlet of the filter element will decrease. After the water pressure in the water pressure switch pipe drops to the rated value, the water pressure switch will reset, connect the circuit, open the concentrated water solenoid valve and the water supply solenoid valve, and the raw water enters the protective pressure protection switch under normal water pressure to start the water pump, pressurizing the raw water into the water inlet end of the filter element and into the cylindrical inlet end face of the filter membrane bag. Foreign matter with larger particle size in the raw water will be intercepted by the inlet end face. Then, the retained water gathers near the inside and outside of the gap on the inlet end face, gradually forming a dense foreign matter filter. The foreign matter filter performs primary filtration on the raw water to become pre-filtered water. The pre-filtered water enters the gaps of several layers of support mesh of the filter element. Under the reverse osmosis pressure, about half of the pre-filtered water penetrates into the filter membrane bag, and the purified output clean water enters the water filter hole, passes through the clean water outlet, and passes through the water outlet pipeline of the return water check valve, and is pressed into the clean water pressure tank for storage and connected to the clean water interface. The clean water interface is connected to the water nozzle to output a large flow of drinking water to meet the quick needs.

[0037] 3. The reverse flushing method of the present application is provided with two reverse flushing schemes: quantitative automatic control of the clean water pressure switch and dynamic intelligent control of the sewage pressure switch. Any selection of either scheme can trigger the controller and open the sewage solenoid valve, so as to promote the clean water in the clean water pressure tank to be divided into two reflux paths, and the sewage throttle valve and the pressure reducing valve are used to control the water pressure balance inside and outside the filter membrane bag, so as to prevent the reverse flushing water pressure from expanding the filter membrane bag from the inside to the outside, effectively avoid the occurrence of irreversible damage and leakage problems, and realize the reverse flushing process.

[0038] 4. The intelligent water purifier of this application adopts a dynamic intelligent backwash filter solution, which can timely remove filter dirt and improve the water production ratio, achieve water saving and emission reduction effects, and break through the technical bottleneck of purifying seawater to produce fresh water through a portable water purifier.

[0039] 5. The intelligent water purifier of this application adopts a repeated filtration pipeline solution, which can further improve the purity of raw water and the seawater purification effect. The repeated filtration pipeline solution can further increase the repeated filtration water output.

[0040] 6. The intelligent water purifier of the present application improves the structure of the RO reverse osmosis filter element into a filter element that combines filtration and purification separation. It adopts a controller to automatically switch the purification process and the intelligent switching backwashing process, and promotes the technical solution of timely reflux of clean water from the clean water pressure tank to backwash the filter element. The filter element is always kept in a clean and hygienic state for purification operation, which improves the water production ratio and achieves the purpose of not having to replace the filter element. It can save water and reduce emissions, save the consumption of multi-stage filter elements, and avoid the odor problem caused by the filtering method that hides dirt and grime. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1This is a structural elevation diagram of the filter element raw water filtration and separation implementation method of this application;

[0042] Figure 2 for Figure 1 AA position plane cross-sectional view;

[0043] Figure 3 This is a structural diagram of the implementation method of pure water reflux backwashing of the filter element of the utility model;

[0044] Figure 4 This is a schematic diagram of the raw water purification pipeline connection of the first embodiment of the intelligent water purifier of this application;

[0045] Figure 5 This is a schematic diagram of the backwash pipeline connection of the second embodiment of the intelligent water purifier of this application;

[0046] Figure 6 This is a schematic diagram of the backwash pipeline connection of the third embodiment of the intelligent water purifier of this application;

[0047] Figure 7 This is a schematic diagram of the backwash pipeline connection of the fourth embodiment of the intelligent water purifier of this application;

[0048] Figure 8 This is a schematic diagram of the raw water repeated filtration pipeline connection of the fifth embodiment of the intelligent water purifier of this application;

[0049] Figure 9 This is another schematic diagram of the raw water repeated filtration pipeline connection of the fifth embodiment of the intelligent water purifier of this application;

[0050] Figure 10 This is a schematic diagram of the backwash pipeline connection of the fifth embodiment of the intelligent water purifier of this application.

[0051] Reference numerals:

[0052] 1. Controller; 2. Clean water pressure tank; 3. Clean water pressure switch; 3-1. Protection pressure switch; 4. Concentrated water solenoid valve; 4-1. Post-stage concentrated water solenoid valve; 5. Concentrated water throttle valve; 5-1. Post-stage concentrated water throttle valve; 6. Filter element; 6-1. Post-stage filter element; 61. Housing; 62. Center tube; 63. Filter membrane bag; 64. Support net; 65. Sealing ring; 66. Foreign matter filter screen; 67. End face; 68. Positioning terminal; 68-1 Outer tube, 68-2 Inner tube; 68-3 Support plate; 69-1 Water inlet, 69-2 Clean water outlet; 69-3 Concentrated water outlet; 69-4 Water inlet hole; 69-5 Water filter hole; 7. Sewage discharge solenoid valve; 8. Water supply and power supply Magnetic valve; 9. Water pump; 9-1. Post-stage water pump; 10. Clean water check valve; 10-1. Post-stage clean water check valve; 11. Pressure reducing valve; 11-1. Post-stage pressure reducing valve; 12. Backflow check valve; 12-1. Post-stage backflow check valve; 13. Sewage throttle valve; 14. Water supply interface; 14-1. Sewage water inlet; 14-2. Concentrated water interface; 14-3. Clean water inlet; 14-4. Washing water inlet; 15. Sewage pressure switch; 16. Pressure regulating valve; 17. Concentrated water check valve; 17-1. Outlet check valve; 17-2. Water supply check valve; 18. Water supply pressure switch; 19. Concentrated water pressure switch; 20. Concentrated water pressure tank; 21. Post-stage reflux solenoid valve. DETAILED DESCRIPTION

[0053] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more apparent, the present invention will be further described in detail below with reference to the accompanying drawings. The components of the embodiments of the present invention generally described and illustrated in the accompanying drawings can be arranged and designed in a variety of different configurations. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0054] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0055] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0056] In the description of this application, it should be understood that the terms "up", "down", "left", "right", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they should not be understood as limitations on this application.

[0057] The following is a detailed description of the embodiments of the present invention in conjunction with the accompanying drawings. In the absence of conflict, the features of the following embodiments can be combined with each other. Example 1

[0058] See also Figure 1 This embodiment discloses a filter element, which includes a bottle shell 61, a central tube 62, a filter membrane bag 63, a support mesh 64, a sealing ring 65, a foreign matter filter screen 67, and an inlet end face 68. Bottle shell 61 includes a bottle bottom and a bottle cap, which is threadedly connected to the bottle mouth. A water inlet 69-1 is located in the center of the bottle cap, serving as the water inlet for bottle shell 61. A clean water outlet 69-2 is located in the center of the bottle bottom, serving as the clean water outlet 69-2 for filter element 6. A concentrated water outlet 69-3 is located on one side of the bottle bottom, serving as the concentrated water outlet for filter element 6.

[0059] The central tube 62 includes a water inlet pipe and a water outlet pipe which are arranged in a connected manner. The water inlet pipe and the water outlet pipe are separated by a partition and are not communicated with each other. A sealing ring is provided on the outer wall of the water outlet pipe near the clean water outlet 69-2. The sealing ring is sealed and connected to the clean water outlet 69-2 at the bottom of the bottle. The pipe mouth of the water inlet pipe abuts the water inlet 69-1 of the outer shell 61. A through water inlet hole 69-4 is provided on the pipe wall of the water inlet pipe. A plurality of through water filter holes 69-5 are provided on the pipe wall of the water outlet pipe. The filter membrane bag 63 is a three-sided closed pocket made of two pieces of reverse osmosis fabric with a supporting net sandwiched inside. The bag openings of several filter membrane bags 63 are all connected to the water filter hole 69-5, and the edge of the bag opening abuts and seals against the outer wall of the water outlet pipe.

[0060] Several pieces of support nets 64 are respectively arranged between the gaps of each filter membrane bag 63. Several pieces of support nets 64 and several filter membrane bags 63 are tightly attached to the outer wall of the outlet pipe and wrapped several times to form a cylindrical filter membrane assembly 66.

[0061] The sealing ring 65 is arranged between the outer wall of the cylindrical filter membrane assembly 66 and the inner wall of the bottle shell 61.

[0062] The foreign matter filter 67 is a dynamically formed foreign matter filter 67 formed by foreign matter filtered from the raw water and retained near the inlet end face of the filter membrane assembly 66 .

[0063] See also Figure 1 and Figure 2The filter element 6 includes a positioning terminal 68, which includes an outer tube 68-1, an inner tube 68-2 and several support plates 68-3. One side of the support plate 68-3 is connected to the inner wall of the outer tube 68-1, and the other side of the support plate 68-3 is connected to the outer wall of the inner tube 68-2, forming a hollow cylindrical shape. The inner tube 68-2 of the positioning terminal 68 is mounted on the water inlet pipe of the central tube 62. One end of the positioning terminal 68 is movably abutted against the inlet end face of the filter membrane assembly 66, and the other end of the positioning terminal 68 is movably abutted against the inner wall of the shell 61 of the water inlet 69-1.

[0064] See also Figure 1 When the filter element 6 filters and separates raw water, the raw water enters from the water inlet 69-1 at the upper end of the filter element 6, passes through the water inlet hole 69-4, and passes through the support sheet 68-3. The raw water is blocked by the inlet surface of the filter membrane assembly 66 and the filter membrane bag 63 and support mesh 64 nearby. Foreign matter is gradually retained and forms a foreign matter filter 67, which initially filters the raw water into primary filtered water. On the one hand, the primary filtered water is filtered and separated by the filter membrane assembly 66 to form concentrated water, which is output through the concentrated water outlet. On the other hand, the primary filtered water permeates through the filter membrane bag 63 for purification, and the output clean water flows out through the lower clean water outlet 69-2. Figure 3 When the filter element 6 needs to be backwashed, the clean water in the clean water pressure tank is divided into two refluxes. One path of clean water passes through the pressure reducing valve 11 and enters the clean water outlet 69-2 to permeate through the filter membrane bag 63 and dissolve ions into the filter membrane assembly 66. The other path of clean water passes through the clean water check valve 10 and enters the concentrated water outlet 69-3 to enter the filter membrane assembly 66. The two water flows merge and clean the foreign matter filter screen 67 retained in the filter membrane assembly 66 without dead angles, and the sewage flows out from the water inlet pipe 69-4 to complete the backwash of the filter element 6. The technical solution of improving the filter element 6 is achieved by setting a positioning terminal 68. The positioning terminal 68 is a hollow structure that can pass water back and forth from the filter element 6 in the forward and reverse directions. The positioning terminal 68 fixes the filter membrane bag 63 and the inlet end face of the support net 64, controls the filter membrane assembly 66 to twist and move in the direction of the reverse high-pressure water flow, and prevents the inlet end face of the filter membrane assembly 66 from deforming from a flat surface to a concave surface, thereby damaging the filter membrane bag 63. The positioning terminal 68 can also block the sealing ring 65 from moving with the reverse high-pressure water flow, thereby preventing the sealing ring 65 from slipping out of the inlet end face 66 and losing its sealing function, thereby solving the problem of backflow backwashing damaging the filter element 6. Example 2

[0065] See also Figure 4 This embodiment discloses an intelligent water purifier, including a controller 1, a clean water pressure tank 2, a clean water pressure switch 3, a concentrated water solenoid valve 4, a concentrated water throttle valve 5, a filter element 6, a sewage solenoid valve 7, a water supply solenoid valve 8, a water pump 9, a clean water check valve 10, a pressure reducing valve 11, a backflow check valve 12, a sewage throttle valve 13 and several interface components 14.

[0066] The components are connected as follows: controller 1 is connected to the circuits of various pressure switches, solenoid valves, and water pumps; clean water pressure tank 2 is connected to the outlet pipe of filter element 6; clean water pressure switch 3 is installed in the connecting pipe between clean water pressure tank 2 and the outlet pipe of filter element 6; and protective pressure switch 3-1 is installed in the pipe at the water supply end of water pump 9. Concentrated water solenoid valve 4 is connected to the pipe of concentrated water outlet 69-3 of filter element 6; concentrated water throttle valve 5 is installed in the connecting pipe between concentrated water outlet 69-3 of filter element 6 and concentrated water solenoid valve 4; the water inlet pipe of filter element 6 is connected to the water outlet pipe of water pump 9; the water inlet end of sewage solenoid valve 7 is connected to the connecting pipe between the water inlet pipe of filter element 6 and the water outlet of water pump 9; the water supply solenoid valve 8 is connected to the water supply interface 13; and the water pump 9 is connected to the water outlet pipe of water supply solenoid valve 8. The water inlet end of the clean water check valve 10 is connected to the pipeline connecting the clean water pressure switch 3 and the pressure reducing valve 11, and the water outlet end of the clean water check valve 10 is connected to the pipeline connecting the concentrated water outlet 69-3 of the filter element 6 and the concentrated water throttle valve 5. The pressure reducing valve 11 is arranged on the pipeline between the clean water outlet of the filter element 6 and the clean water pressure switch 3. The water inlet end of the reflux check valve 12 is connected in parallel with the water outlet end pipeline of the pressure reducing valve 11 and is connected to the clean water outlet of the filter element 6. The sewage throttle valve 13 is arranged at the output end of the sewage solenoid valve 7. The input pipeline of the sewage interface 14-1 is connected to the output pipeline of the concentrated water solenoid valve 7. The controller 1 is connected to the circuits of various types of pressure switches, solenoid valves, and water pumps.

[0067] See also Figure 1 、 Figure 4 and Figure 5 When the clean water pressure tank 2 is short of water, the water pressure on the clean water outlet connection pipe of the filter element 6 will decrease. After the water pressure in the clean water pressure switch 3 drops to the rated value, the clean water pressure switch 3 will reset, connect the circuit, open the concentrated water solenoid valve 4 and the water supply solenoid valve 8, and the raw water will enter the protection pressure switch 3-1 under normal pressure and start the water pump 9, pressing the raw water into the filter element 6. The water inlet pipe enters the cylindrical inlet end face of the filter membrane assembly 66, and foreign matter in the raw water is intercepted by the inlet end face, retained and gathered near the inlet end face of the filter membrane assembly 66 and its gaps, gradually forming a foreign matter filter screen 67. The foreign matter filter screen 67 filters the raw water to become primary filtered water, and the primary filtered water enters the gaps of several layers of support mesh 64 of the filter element 6. Under the reverse osmosis pressure, about half of the primary filtered water penetrates into the filter membrane bag 63, and the purified output water enters the water filter hole 69-5, enters the water inlet end pipeline of the return water check valve 12 through the clean water outlet 69-2 of the filter element 6, and is pressed into the clean water pressure tank 2 for storage and connected to the clean water interface 14-2. The clean water interface 14-2 is connected to the water nozzle to output a large flow of drinking water to meet the quick demand.

[0068] The raw water is purified to produce clean water and separate concentrated water. The concentrated water passes through the filter membrane assembly 66 of the filter element 6 and is output through the concentrated water outlet 69-3, entering the concentrated water throttle valve 5 and the concentrated water solenoid valve 4. The concentrated water throttle valve 5 maintains the reverse osmosis pressure while throttling according to an appropriate ratio, and outputs the concentrated water interface 14-2 for external discharge.

[0069] When the water nozzle connected to the clean water interface 14-2 is closed or the clean water pressure tank 2 reaches the rated water storage capacity, the pressure on the clean water outlet pipeline of the filter element 6 will increase. When the pipeline of the clean water pressure switch 3 reaches the rated high pressure value, the water pump 9 is powered off, the concentrated water solenoid valve 4 and the water supply solenoid valve 8 pipeline are powered off and closed, and the linkage controller 1 opens the sewage solenoid valve 7 to discharge sewage, prompting the clean water pressure tank 2 to release pure water into two refluxes. Among them, one water flow is blocked by the return water check valve 12 and is introduced into the pressure reducing valve 11 to reduce pressure, and then passes through the pipeline of the clean water outlet of the filter element 6, reversely passes through the water filter hole 69-5 of the central tube 62, enters the inner side of the filter membrane bag 63, penetrates through the filter membrane bag 63 and dissolves the ions adsorbed on the filter membrane bag 63 to become concentrated water, and enters the gap of the support net 64.

[0070] The other water flow passes through the clean water check valve 10 and enters the concentrated water outlet 69-3 of the filter element 6, directly reaching the surface of the filter membrane bag and the gap of the support net 64, which provides pressure protection for the outer side of the filter membrane bag 63. The above two water flows converge at the gap of the support net 64 and backwash the filter element 6 membrane assembly 66 in all directions, flushing the foreign matter filter screen 67 retained in the gap of the support net 64 and near the inlet end face during the previous filtration, so that the concentrated water and the foreign matter filter screen 67 are dissolved and mixed into sewage, and the sewage is output from the filter element 6 in the reverse direction. The water inlet pipe enters the sewage throttle valve 13. This valve works in conjunction with the pressure reducing valve 11 to limit and stabilize the flow, maintaining a dynamic balance between the water pressure outside the membrane bag 63 and the water pressure inside the membrane bag 63. The rated flow rate of the sewage throttle valve 13 must be adjusted to both amplify the flow rate and reduce the dynamic pressure outside the membrane bag 63, ensuring that the external pressure near the support mesh 64 is close to the pressure inside the membrane bag 63, allowing pure water to penetrate the membrane bag 63. It also reduces the flow rate to prevent the external dynamic pressure from falling below the internal pressure, preventing the back pressure of the membrane bag 63 from expanding from the inside out and damaging the membrane bag 63. Sewage is output from the sewage solenoid valve 7 and discharged to the outside through the concentrated water interface 14-2. Once the foreign matter filter 67 is rinsed clean, the controller 1 will promptly shut off the sewage solenoid valve 7. Example 3

[0071] See also Figure 6 The difference between this embodiment and the second embodiment is that the water purifier further includes a sewage pressure switch 15 and a pressure regulating valve 16. The sewage pressure switch 15 and the pressure regulating valve 16 are connected in series. The water inlet end of the pressure regulating valve 16 is connected to the pipeline connecting the water inlet pipe of the filter element 6 and the water outlet end of the water pump 9. The circuit of the sewage pressure switch 15 is connected to the controller 1.

[0072] See also Figure 1 and Figure 6 The water purifier of this embodiment, by providing a pressure-stabilizing valve 16, can reduce the peak-to-valley pressure variations of the water pump, thereby coordinating with the sewage pressure switch to accurately detect the rated pressure value. As filter element 6 filters and separates raw water to produce purified water, ions and foreign matter continuously accumulate and become trapped on the inlet end face 66 of filter element 6, forming a foreign matter filter 67. As water supply continues, the density of foreign matter filter 67 increases, causing the water pressure in the water inlet pipeline to gradually increase. When the pressure in the sewage pressure switch 15, located in the water inlet pipe of filter element 6, increases to the rated value, it triggers the controller, shutting off the water pump, water supply solenoid valve 8, and concentrated water solenoid valve 4. It also opens the sewage solenoid valve 7, releasing clean water from the clean water pressure tank into two channels to backwash the filter element 6. Once the foreign matter filter 67 is completely removed, the sewage solenoid valve 7 is reset and closed, achieving the purpose of dynamically coordinating and timely flushing of the foreign matter filter 67. The frequency of the above-mentioned backwashing is dynamically proportional to the ion concentration of the raw water. The intelligent control technology solution is convenient for adjusting the minimum pure water return flow to flush the filter element 6 foreign matter. It is suitable for filtering and purifying different water sources, solves the problem of scaling during long-term operation, and improves the water purification output ratio, breaking through the technical bottleneck of desalination of seawater through purification. Example 4

[0073] See also Figure 7 The difference between this embodiment and the fourth embodiment is that the water purifier further includes a concentrated water utilization pipeline, which is arranged between the water inlet pipeline of the water pump 9 and the concentrated water outlet pipeline of the filter element 6. The concentrated water utilization pipeline includes a water supply pressure switch 18, a concentrated water pressure switch 19, a concentrated water pressure tank 20, a concentrated water check valve 17, a water outlet check valve 17-1, and a water supply check valve 17-2.

[0074] The water supply pressure switch 18 is installed on the water supply pipeline between the inlet of the water supply check valve 17-2 and the outlet of the water supply solenoid valve 8. The concentrate pressure switch 19 and concentrate pressure tank 20 are installed on the pipeline at the outlet of the concentrate solenoid valve 4. The inlet of the concentrate check valve 17 is connected to the concentrate outlet pipeline of the filter element 6, and the outlet of the concentrate check valve 17 is connected to the pipeline at the inlet of the concentrate solenoid valve 4. The inlet of the outlet check valve 17-1 is connected to the pipeline at the outlet of the concentrate check valve 17. The outlet of the water supply check valve 17-2 is connected to the pipeline between the outlet of the outlet check valve 17-1 and the wash water interface 14-4. The circuits for each type of pressure switch and solenoid valve are connected to the controller 1.

[0075] The water purifier of this embodiment is equipped with a brine check valve 17 to prevent brine from flowing back into the filter element 6 from the brine pressure tank 20. A water outlet check valve 17-1 is provided to prevent supply water from entering the brine pipeline, and a water supply check valve 17-2 is provided to prevent brine from entering the water supply pipeline. Under normal tap water pressure, the water supply pressure switch circuit is disconnected, and the water supply solenoid valve 8 pipeline is closed. When washing water is needed daily, the brine from the brine pressure tank 20 is discharged by opening the tap connected to the washing water outlet of the brine utilization pipeline. When brine discharge is nearly complete, the pipeline pressure decreases, and the water supply pressure switch is energized after reducing the pressure to the rated value, triggering the controller 1 to open the water supply solenoid valve 8 and introduce tap water from the water supply port for continued washing water supply. Closing the tap restores the tap water pressure to normal, resetting the water supply pressure switch 18 circuit, de-energizing, and closing the water supply solenoid valve 8. Brine is discharged and comprehensively utilized, saving water while maintaining the original normal flow rate and convenient use of domestic water. Example 5

[0076] See also Figure 8 、 Figure 9 and Figure 10 The difference between this embodiment and the above embodiments is that the water purifier of this embodiment includes a rear-stage or several-stage repeated filtration pipeline, and the rear-stage repeated filtration pipeline is arranged on the pipeline at the water outlet end of the purified water pressure tank. The rear-stage repeated filtration pipeline includes a rear-stage filter element 6-1, a rear-stage concentrated water solenoid valve 4-1, a rear-stage concentrated water throttle valve 5-1, a rear-stage purified water check valve 10-1, a rear-stage pressure reducing valve 11-1, a rear-stage reflux check valve 12-1, a rear-stage reflux solenoid valve 21, a rear-stage water pump 9-1, a rear-stage purified water pressure tank 2-1 and a purified water pressure switch 3.

[0077] The post-stage filter element 6-1, post-stage concentrated water solenoid valve 4-1, post-stage concentrated water throttle valve 5-1, post-stage clean water check valve 10-1, post-stage pressure reducing valve 11-1, post-stage reflux check valve 12-1 and post-stage clean water pressure tank 2-1 are connected in the same way as the first-stage filter element 6, concentrated water solenoid valve 4, concentrated water throttle valve 5, clean water check valve 10, pressure reducing valve 11, reflux check valve 12 and clean water pressure tank 2.

[0078] The outlet of the secondary return solenoid valve 21 is connected in parallel to the inlet of the secondary water pump 9-1, connected to the pipeline leading to the outlet of the primary water pump 9. The inlet of the secondary return solenoid valve 21 and the outlet of the secondary water pump 9-1 are also connected in parallel to the inlet of the secondary filter element 6-1. The purified water pressure switch 3 is repositioned in the corresponding position on the re-filtration pipeline. The circuits for these various pressure switches, water pumps, and solenoid valves are connected to the controller 1.

[0079] When the raw water is tap water, the outlet pipe of the subsequent concentrated water solenoid valve 4-1 is connected to the water supply pipe of the water pump 9. The concentrated water separated and discharged by the subsequent filter element 6-1 can be reused and filtered and purified repeatedly. For seawater, well water, or other water sources that do not require water conservation, the concentrated water discharged by the subsequent filter element 6-1 does not need to be reused. The output pipe of the subsequent concentrated water solenoid valve 4-1 is connected to the output pipe of the concentrated water solenoid valve 4, and discharged together. After two or more stages of repeated filtration and separation, the seawater or other raw water can produce purer drinking water.

[0080] The beneficial effects of the water purifier of the present application are as follows: by improving the structure of the filter element 6, the purpose of reverse flushing is achieved, and the controller 1 is used to switch various solenoid valve pipelines in time according to actual needs, so as to promote the reflux of high-pressure purified water from the water pressure tank 2 to backwash the filter element 6 in an appropriate amount, thereby maintaining the filter element 6 in a clean and sanitary state at all times, filtering tap water, well water, river water and sea water, and producing pure water by separating concentrated water. The water purifier of the present application abandons the existing multi-stage dirt and grime filtration method and innovates a one-in-three-out separation method, thereby achieving the purpose of not having to replace the filter element 6 through intelligent backwashing of the water purifier, solving the problem of multi-stage filter element consumption in the background technology and eliminating the odor problem caused by long-term filtering of dirt and grime, ensuring the sanitation and safety of drinking water, reducing the waste of water resources, and meeting the actual demand for high-flow output of pure water. Example 6

[0081] This embodiment provides a backwashing method for a filter element, which is applicable to the intelligent water purifier described in any of the above embodiments. The backwashing method for a filter element includes the following steps:

[0082] Open the sewage solenoid valve to discharge sewage, and the water pressure tank releases high-pressure pure water to flow back in two ways;

[0083] Among them, one water flow is blocked by the return water check valve and directed into the pressure reducing valve. After the pressure is reduced, it flows back into the filter element through the outlet pipe, penetrates through the filter membrane bag, dissolves the attached ions and enters the filter membrane assembly. The other water flow passes through the clean water check valve and flows back into the concentrated water outlet and also into the filter membrane assembly. The two water flows converge into the filter membrane assembly, backwashing the retained ions and foreign matter filter screen in all directions, and mixing them into sewage.

[0084] The sewage is output in reverse from the water inlet pipe through the sewage throttle valve, which regulates the flow pressure of the two water flows in the filter element and discharges the sewage.

[0085] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely illustrative of the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention is subject to various changes, modifications, substitutions and variations, and all such changes, modifications, substitutions and variations fall within the scope of the present invention.

Claims

1. A filter element, characterized in that: The utility model comprises a shell, a central tube, a filter membrane assembly, a sealing ring and a positioning terminal. The shell is in the shape of a bottle and is provided with a clean water outlet and a concentrated water outlet at one end of the bottom of the bottle and a water inlet at the other end. The central tube comprises a water inlet pipe and a water outlet pipe which are connected as a whole. The water inlet pipe and the water outlet pipe are separated and not communicated with each other by a partition. A through water inlet hole is provided on both sides of the pipe wall of the water inlet pipe. The pipe mouth of the water inlet pipe abuts the water inlet of the shell. A through water filter hole is provided on both sides of the pipe wall of the water outlet pipe. The pipe mouth of the water outlet pipe abuts the clean water outlet of the shell. The filter membrane assembly comprises a supporting net and a filter membrane bag. The opening of the filter membrane bag abuts the several water filter holes. When connected, the support net overlaps with the filter membrane bag and abuts the outer wall of the water outlet pipe to form a cylindrical filter membrane assembly. The sealing ring is arranged between the cylindrical filter membrane assembly and the inner wall of the shell. The positioning terminal includes an outer tube, an inner tube and a plurality of support plates. The outer diameter of the outer tube is larger than the inner diameter of the sealing ring and smaller than the outer diameter of the sealing ring. One side of the support plate is connected to the inner wall of the outer tube and the other side is connected to the outer wall of the inner tube. The inner tube of the positioning terminal is sleeved on the outer wall of the water inlet pipe. One end of the outer tube is movably abutted against the inner wall of the shell on one side of the water inlet, and the other end is movably abutted against the inlet end face of the filter membrane assembly.

2. An intelligent water purifier, characterized in that: The filter element according to claim 1 further comprises: a purified water pressure tank, connected to the water outlet pipe of the filter element; A clean water pressure switch, connected between the water outlet pipe and the clean water pressure tank; A clean water check valve, the water inlet end of which is connected between the clean water pressure tank and the concentrated water outlet; a concentrated water solenoid valve connected to the concentrated water outlet; a concentrated water throttle valve connected between the concentrated water solenoid valve and the concentrated water outlet; Water supply solenoid valve, connected to the water supply port; a water pump connected between the water supply solenoid valve and the water inlet pipe; A sewage discharge solenoid valve, the water inlet end of which is connected to the connecting pipe between the water inlet of the filter element and the water outlet end of the water pump; A sewage throttle valve is connected to the water outlet of the sewage solenoid valve, or is connected between the water inlet of the sewage solenoid valve and the water inlet pipe of the filter element; a pressure reducing valve connected between the purified water pressure switch and the water outlet pipe of the filter element; A backflow check valve, the water inlet end of the backflow check valve is connected to the water outlet pipe of the filter element, the water outlet end of the backflow check valve is connected to the purified water pressure switch, and the backflow check valve is connected in parallel with the pressure reducing valve; The controller controls the purification process and the backwash process. The controller is connected with the circuits of various types of pressure switches and solenoid valves to automatically control the purification process and the backwash process.

3. The intelligent water purifier according to claim 2, characterized in that: The purification process includes: the raw water entering the water supply solenoid valve is purified by the filter element, the produced pure water flows out from the clean water outlet, passes through the reflux check valve and is pressed into the clean water pressure tank, the separated concentrated water flows out from the concentrated water outlet, passes through the concentrated water throttle valve and is output through the concentrated water solenoid valve.

4. The intelligent water purifier according to claim 2, characterized in that: The backwash process includes a quantitative automatic backwash process and a dynamic intelligent backwash process.

5. The intelligent water purifier according to claim 4, characterized in that: It also includes a clean water pressure switch, which is connected between the clean water outlet pipe and the clean water pressure tank. The quantitative automatic backwash process includes: when the clean water produced by the purification process is pressed into the clean water pressure tank to reach the rated capacity, the clean water pressure switch reaches the rated pressure value to trigger the controller to shut down the water supply solenoid valve and the concentrated water solenoid valve, and energize the sewage discharge solenoid valve to open and discharge sewage, so that the clean water pressure tank releases high-pressure clean water and divides it into two paths to reflux and backwash the filter element.

6. The intelligent water purifier according to claim 4, characterized in that: It also includes a pressure-stabilizing valve, which is connected to the connecting pipeline between the water inlet of the filter element and the water outlet of the water pump, and a sewage pressure switch, which is connected to the water outlet of the pressure-stabilizing valve. The dynamic intelligent backwash process includes: raw water is gradually pressed into the filter element, so that the retained ion concentration and the density of foreign matter in the filter membrane assembly gradually increase, and the resistance gradually increases, causing the pressure of the sewage pressure switch to increase to the rated pressure value, connecting the circuit to trigger the controller, shutting down the water supply solenoid valve and the concentrated water solenoid valve, and energizing the sewage solenoid valve to open and discharge sewage, so that the clean water pressure tank releases high-pressure clean water and divides it into two paths to reflux backwash the filter element.

7. The intelligent water purifier according to claim 2, characterized in that: It includes a concentrated water utilization pipeline, which includes a concentrated water pressure switch, a concentrated water pressure tank and a concentrated water check valve. The concentrated water pressure switch and the concentrated water pressure tank are arranged on the pipeline at the water outlet end of the concentrated water solenoid valve. The water inlet end of the concentrated water check valve is connected to the pipeline at the concentrated water outlet end of the filter element, and the water outlet end of the concentrated water check valve is connected to the pipeline at the water inlet end of the concentrated water solenoid valve.

8. The intelligent water purifier according to claim 2, characterized in that: It also includes a repeated filtration pipeline, and the components of the repeated filtration pipeline include: a rear-stage filter element, a rear-stage concentrated water solenoid valve, a rear-stage concentrated water throttling valve, a rear-stage clean water check valve, a rear-stage return water check valve, a rear-stage pressure reducing valve, a rear-stage clean water pressure switch and a rear-stage clean water pressure tank. The repeated filtration pipeline components are connected to the filter element, concentrated water solenoid valve, concentrated water throttling valve, clean water check valve, return water check valve, pressure reducing valve, clean water pressure switch and clean water pressure tank in the same way, and the water inlet of the rear-stage filter element is connected to the clean water outlet.

9. The intelligent water purifier according to claim 2, characterized in that: It also includes a repeated filtration pipeline, which also includes a post-stage water pump and a reflux solenoid valve. The water inlet end of the reflux solenoid valve is connected in parallel with the water outlet end of the post-stage water pump. One end of the parallel connection is connected to the post-stage filter element inlet pipe, and the other end of the parallel connection is connected to the output pipeline of the first-stage clean water outlet pipe. The components of the repeated filtration pipeline also include: a post-stage filter element, a post-stage concentrated water solenoid valve, a post-stage concentrated water throttle valve, a post-stage clean water check valve, a post-stage pressure reducing valve and a post-stage clean water pressure tank. The repeated filtration pipeline components are connected in the same way as the first-stage filtration pipeline components.

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