A forward and reverse washing filter element and a split water purifier

Abstract

This application discloses a forward and reverse washing filter element and its separate water purifier. The forward and reverse washing filter element includes a shell, a filter pipe, a membrane module, a positioning terminal, and a positioning support. The shell is bottle-shaped, with a pure water outlet and a wastewater outlet at the bottom and a raw water inlet at the other end. The filter pipe has several filter holes on its wall, with one end inserted into the pure water outlet and the other end closed. The membrane module includes a support mesh and a reverse osmosis membrane. Two reverse osmosis membranes are sandwiched between a support mesh and are closed on three sides to form a pocket shape. The pocket opening is connected to and sealed with the filter holes. The membrane module is wound around the filter pipe to form a cylinder. The positioning terminal includes a round tube and a hollow base plate. One end of the round tube abuts against the inner wall of the shell at the raw water inlet end, and the other end abuts against the inlet end face of the membrane module through the base plate. The positioning support includes several support plates, one end of which is connected to the inner wall of the bottom of the shell, and the other end abuts against the outlet end face of the membrane module. This structure can prevent the membrane module from being damaged by water flow and facilitates backwashing.

Description

Technical Field

[0001] This application relates to the technical field of water purifiers, and in particular to a forward and reverse washing filter cartridge and a separate water purifier. Background Technology

[0002] Current water purifiers or direct drinking water machines use a process where seawater, river water, well water, or tap water (hereinafter collectively referred to as raw water) is filtered through multiple pre-filters to remove impurities before being fed into a reverse osmosis filter. While reverse osmosis filters are theoretically a forward-flushing method for separating impurities, they also allow some dirt and grime to accumulate. Prolonged retention of this grime inevitably leads to fermentation and odor production. Therefore, a post-activated carbon filter is needed to absorb the odor and produce purified water (hereinafter referred to as pure water). This pure water meets food safety standards and can be consumed directly. The concentrated wastewater is then discharged as wastewater. However, this type of filtration water purifier requires frequent replacement of filters and activated carbon, resulting in numerous problems related to multi-stage filter consumption and waste disposal. Repeated experiments revealed the following problem: Under the high pressure of the forward filtration water flow, the raw water squeezes the membrane module, causing it to twist and elongate. The outlet end face elongates from a flat surface into a concave shape. Normally, this concave shape would not cause any problems, but when encountering backwash water flow, it moves back to its original position. The frequent expansion and contraction of the membrane module due to its reciprocating movement leads to fatigue damage. Furthermore, the backwash water flow enters the reverse osmosis membrane filter pipe after the pressure reducing valve is lowered. Its internal pressure is lower than the external pressure of the membrane module, preventing it from flowing back from the inside to the outside to backwash the reverse osmosis membrane. This fails to achieve the effect of comprehensive backwashing from both inside and outside, requiring further innovation and improvement. Utility Model Content

[0003] The purpose of this application is to provide a forward and reverse washing filter element, a separate water purifier, and an automatic backwashing method thereof. First, the reverse osmosis filter element is improved from a single forward washing structure to a forward and reverse washing filter element structure. Second, a technical solution is provided to improve the filter-type water purifier into a separate water purifier, eliminating the need for multi-stage filter elements that accumulate dirt and grime, and enabling the separation and purification of various raw water sources to produce pure water. Third, a pressure switch and controller are used to control the pure water to flow back in two separate streams with equal water pressure for automatic backwashing, achieving self-cleaning of the forward and reverse washing filter element and eliminating the need for long-term replacement.

[0004] To achieve the above objectives, the following technical solutions are adopted:

[0005] In a first aspect, this application provides a forward and reverse washing filter element (hereinafter referred to as filter element), comprising:

[0006] The shell is bottle-shaped, with a pure water outlet and a wastewater outlet at one end of the bottom, and a raw water inlet at the other end.

[0007] The filter pipe has several through-holes on both sides of the pipe wall. One end of the filter pipe is closed, and the other end of the filter pipe is connected to the pure water outlet of the shell.

[0008] The membrane module includes a support mesh and a reverse osmosis membrane. The reverse osmosis membrane is made into a three-sided closed pocket by sandwiching a support mesh between two reverse osmosis fabrics. The pocket openings of several reverse osmosis membranes are connected to several water filtration holes. The edges of the pocket openings are sealed against the outer wall of the water filtration tube. Several support meshes are respectively set between the gaps of each reverse osmosis membrane. Several support meshes and several reverse osmosis membranes are closely attached to the outer wall of the water filtration tube and wrapped several times to form a cylindrical membrane module.

[0009] The positioning terminal includes a round tube and a hollow base. The outer diameter of the round tube is slightly smaller than the inner diameter of the shell. One end of the round tube abuts against the inner wall of the shell at the raw water inlet end, and the other end is connected to the outer edge of the hollow base. The outer diameter of the hollow base is larger than the outer diameter of the round tube and is close to equal to the inner diameter of the shell. A round hole is provided in the center of the hollow base, and the round hole fits into the outer wall of the closed tube head of the filter tube. The hollow base abuts against the inlet end face of the membrane module.

[0010] The positioning support includes several support plates, one end of which is connected to the inner wall of the bottom of the housing, and the other end of which abuts against the outlet end face of the membrane module.

[0011] Beneficial effects: By employing a positioning support that abuts against the outlet end face of the membrane module, the positioning support can prevent the membrane module from moving under the forward pressure of the filtered water flow, avoiding the outlet end face of the membrane module from twisting and extending from its normal planar shape to a concave shape. Similarly, the positioning terminals prevent the membrane module from moving under the reverse pressure of the backwash water flow, avoiding the inlet end face of the membrane module from twisting and extending from its normal planar shape to a concave shape. This avoids frequent reciprocating movement of the membrane module, preventing damage and leakage. It improves the existing reverse osmosis filter element from a single forward flushing structure to a filter element structure that can be flushed in both directions, laying the foundation for its ability to withstand backwashing. It is suitable for separating and purifying relatively clean tap water and can maintain self-cleaning operation for a long time, producing pure water.

[0012] In conjunction with the filter element in the first aspect, a further solution also includes a forward and reverse washing composite filter element (hereinafter referred to as a composite filter element). The composite filter element includes a membrane module assembly and composite terminals. The composite terminals include:

[0013] The round pipe has one end abutting against the inner wall of the raw water inlet of the shell, and the other end connected to the hollow base.

[0014] The hollow base has an outer diameter larger than the outer diameter of the round tube and slightly smaller than the inner diameter of the shell. The hollow base has a round hole in the center, which fits and is sleeved onto the outer wall of the tube head of the central filter tube at the inlet end face of the membrane module. The hollow base abuts against the inlet end face of the membrane module.

[0015] The inner cover is perforated, and its outer edge is movably connected to the inner opening of the round tube.

[0016] A sealing ring is located on the outer wall of the round tube near the chassis end, between it and the inner wall of the housing;

[0017] Filter cotton is placed inside the cavity of the composite terminal tube.

[0018] Beneficial Effects: By using a composite terminal chassis with a circular hole that fits snugly onto the outer wall of the central filter tube at the inlet end of the membrane module, combined with a sealing ring positioned between the outer wall of the circular tube near the chassis end and the inner wall of the housing, the membrane module is fixed in the center of the composite filter element. This eliminates the need for fixing the inlet pipe of existing reverse osmosis filter elements, allowing the filter cotton to be placed within the inner cavity of the composite terminal circular tube, thus making full use of space. Using a composite filter element allows for applications where the raw water is well water, river water, seawater, or other water containing high levels of impurities and salt. On one hand, the raw water is pumped into the raw water inlet of the composite filter element, passes through the filter cotton within the composite terminal cavity for initial filtration of significant impurities, and then enters the membrane module to produce pure water. On the other hand, the pure water backwashes the filter cotton after backwashing the membrane module, achieving self-cleaning of the composite filter element. This also eliminates the need for activated carbon and multi-stage filter elements that trap dirt and impurities, enabling continuous purification and separation of raw water with high levels of impurities and foreign matter, thus producing pure water.

[0019] Secondly, this application provides a split-type water purifier (hereinafter referred to as a water purifier), including a filter element or composite filter element as described in the first aspect, and further including:

[0020] A water pump is connected between the raw water pipe interface and the raw water inlet of the filter element.

[0021] A pure water pressure tank is connected between the pure water outlet pipe of the filter element and the pure water interface.

[0022] A pure water pressure switch is connected between the pure water outlet pipe of the filter element and the pure water pressure tank.

[0023] Wastewater solenoid valve, with the inlet end connected to the wastewater outlet pipe of the filter element, and the outlet end connected to the sewage interface;

[0024] The check valve has its inlet end connected to the pipeline between the pure water outlet of the filter element and the pure water pressure tank, and its outlet end connected to the pipeline between the wastewater outlet of the filter element and the inlet end of the wastewater solenoid valve.

[0025] The wastewater throttling valve is connected between the wastewater outlet of the filter element and the inlet of the wastewater solenoid valve.

[0026] The sewage throttling valve has its inlet end connected to the pipeline connecting the water pump outlet end and the filter element raw water inlet end, and its outlet end connected to the sewage solenoid valve inlet end.

[0027] The sewage solenoid valve has its inlet end connected to the sewage throttle valve and its outlet end connected to the sewage interface.

[0028] The controller is connected to the circuits of various pressure switches, solenoid valves and water pumps, including automatic control of the switching between raw water purification, separation and production water and backwashing processes.

[0029] Raw water is pumped into the filter element's inlet by a self-priming booster pump. Passing through the positioning terminals and the membrane module inlet face, foreign matter in the raw water is continuously retained on the membrane module inlet face and near the support mesh, forming a foreign matter filter layer. The raw water then undergoes synergistic filtration through this filter layer and the membrane module. On one hand, tiny foreign matter, ions, bacteria, and viruses in the raw water are isolated by the reverse osmosis membrane and, under osmotic pressure, separated through the membrane to produce a portion of pure water. This pure water passes through the filter holes, pure water outlet, and pure water pressure switch of the filter pipe and is then pumped into a pure water pressure tank for storage. On the other hand, the tiny foreign matter and remaining raw water are concentrated into wastewater. This wastewater passes through the positioning support, wastewater outlet, and wastewater throttling valve. The throttling valve, maintaining reverse osmosis pressure, throttles the flow according to the wastewater ratio, outputting wastewater into the wastewater solenoid valve and flowing into the sewage outlet discharge pipe. Furthermore, when the pure water stored in the pure water pressure tank reaches the rated high pressure value of the pure water pressure switch, it will cut off the power, shutting off the wastewater solenoid valve and pump, stopping water production. Because the water pump has a backstop function, it can maintain the pressure of pure water in the pure water pressure tank for backup. When the pure water is used in large-volume output, the water pressure in the pipeline drops. When the water pressure of the pure water pressure switch drops to the rated value, its normally closed contact will reset and energize the water pump, opening the wastewater solenoid valve to continuously start the water production process.

[0030] Beneficial effects: By adopting the technical solution of pressure-maintaining water storage in a water purification pressure tank, the effect of replacing high-flow-rate reverse osmosis filter cartridges with low-flow-rate reverse osmosis filter cartridges can be achieved, and a series of component models and grades can be reduced accordingly; reducing the filter cartridge flow rate grade can also improve the purity of pure water; reducing the component flow rate grade can also facilitate the improvement of component performance stability and its assembly process, and can also save costs; the water purification pressure tank solves the actual need for high-flow-rate pure water output, and also stores the necessary high-pressure pure water for backwashing filter cartridges.

[0031] Thirdly, this application provides an automatic backwashing method, including a quantitative self-starting backwashing step using a pure water pressure switch:

[0032] During the water separation process of the water purifier, if the water level in the pure water pressure tank exceeds the rated high pressure value of the pure water pressure switch, the normally closed contact of the pure water pressure switch will disconnect the intermediate relay of the controller, cutting off the power to the water pump and closing the wastewater solenoid valve to stop water production. The pure water pressure switch will also trigger the time-delay relay of the controller through its normally open contact, energizing the wastewater solenoid valve to release the pure water from the pure water pressure tank, which is then divided into two equal-pressure return streams. One stream returns to the pure water outlet of the filter element, passing through several filter holes in the filter pipe, squeezing and dissolving the tiny foreign matter retained in the previous filtration from the inside out, removing it from the outer wall of the reverse osmosis membrane and returning it to the support mesh gaps of the membrane module. The other stream passes through the check valve, flowing backwards through the wastewater outlet and also into the membrane module. The two streams of pure water converge at equal pressure in the support mesh gaps, providing a relative balance between the external and internal water pressures of the reverse osmosis membrane. This prevents back pressure on the filter element and allows for comprehensive backwashing of the membrane module from both inside and outside. Foreign matter trapped in the support mesh and near the inlet face of the filter layer from the previous filtration is flushed out, turning into wastewater. This wastewater flows back out through the raw water inlet of the filter element, passing through a wastewater throttling valve. This valve, while maintaining the water pressure outside the reverse osmosis membrane, slowly releases the wastewater. This is done to prevent a rapid drop in water pressure outside the membrane, which could cause back pressure damage if it falls below the pressure inside the membrane. It also prevents excessive backflow of pure water, which could cause a sudden pressure drop in the pure water pressure switch, leading to disordered sensor activation and hindering water production. The wastewater is discharged through a wastewater solenoid valve. After the controller has cleared the contaminants within a certain time, its time relay closes the wastewater solenoid valve. Because the water pump has a backflow prevention function, it maintains the pressure in the pure water pressure tank for later use. When pure water is used, the pipeline water pressure drops, and the pure water pressure switch returns to its rated value. Its normally closed contact resets, energizing the controller. The controller then energizes the water pump and opens the wastewater solenoid valve via an intermediate relay, restarting the water production process.

[0033] The technical solutions for connecting pressure switch sensors and controllers, as well as their relays and time delay relay circuits to switch various types of solenoid valves, and other circuit connection methods, are all existing conventional technologies and do not need to be listed and explained in detail. They can be selected and implemented according to actual needs.

[0034] Beneficial effects: By using a pure water pressure switch to initiate backwashing, the filter cartridge is automatically backwashed quantitatively. This innovative split-type water purifier breaks through the technical bottleneck of automatic backwashing of reverse osmosis membranes, achieving the purpose of switching between membrane separation for water production and self-cleaning. It improves the existing filter-type reverse osmosis water purifiers that accumulate dirt and grime into a split-type water purifier that separates dirt, concentrated water, and pure water. This eliminates the need for multi-stage filtration processes involving activated carbon and ultrafiltration membranes to purify raw water, as well as the problem of odors caused by dirt fermentation. The structure is simple, reliable, and cost-effective.

[0035] In conjunction with the third backwashing method, a further solution also includes a backwash flow-limiting pipeline, which includes:

[0036] The pure water throttle valve is connected between the pure water outlet of the filter element and the pipeline connecting the pure water pressure switch and the inlet of the check valve;

[0037] The pure water check valve has its inlet end connected to the pure water outlet of the filter element, and its outlet end connected to the pipeline between the pure water pressure switch and the pure water throttle valve.

[0038] The raw water solenoid valve is connected between the raw water interface and the water pump inlet;

[0039] Beneficial effects: By adopting the backwashing flow-limiting pipeline technology, the pure water check valve introduces pure water into the pure water throttling valve. The pure water throttling valve can accurately adjust the pure water return flow of the rated filter pipe. Moreover, the pure water throttling valve and the sewage throttling valve work together to throttle the flow, which can not only achieve the purpose of dynamically adjusting the internal pressure of the reverse osmosis membrane to maintain a comprehensive balance with its external pressure, but also improve the efficiency of filter element separation and water production by saving pure water return. By using the raw water solenoid valve, in scenarios where the raw water supply pipeline has normal water pressure, when the sewage solenoid valve releases sewage, closing the raw water solenoid valve can prevent raw water from entering the water pump and being wasted during discharge.

[0040] In conjunction with the third backwashing method, a further solution also includes a return flow control pipeline, which includes a pure water solenoid valve. The inlet end of the pure water solenoid valve is connected to a pure water pressure switch, and the outlet end is connected to the pipeline connecting the outlet ends of the pure water throttle valve and the pure water check valve.

[0041] Beneficial effects: By adopting a backflow control pipeline, the pure water solenoid valve has a normal forward-closing state when powered off, which can seal the high-pressure water storage in the pure water pressure tank. When the pure water solenoid valve is powered off, it can prevent pure water from flowing back to the filter element. When water production stops, the wastewater solenoid valve can be opened in time to release the wastewater remaining in the filter element or composite filter element, avoiding long-term pressure fatigue of the filter element. It can also be powered on in time to open the pure water solenoid valve to release pure water to flow back to the backwash filter element. The pure water solenoid valve also has a normal reverse-flow state when powered off. When water production is started, pure water can flow back into the pure water pressure tank through the powered-off pure water solenoid valve.

[0042] In conjunction with the third backflushing method, further solutions include piping and procedures for dynamically initiating the backflushing method:

[0043] The dynamic backflushing pipeline includes:

[0044] A pressure regulating valve is connected between the raw water inlet of the filter element or composite filter element and the water outlet of the water pump.

[0045] The raw water pressure switch is connected to the outlet of the pressure regulating valve.

[0046] The dynamic backwashing procedure includes:

[0047] The water pump continuously pressurizes raw water into the composite filter element. Ions and foreign matter accumulate and remain on the filter cotton, the inlet face of the membrane module, and near the support mesh, forming a foreign matter filter layer. As the raw water continues to flow, the density of the foreign matter filter layer increases, and the resistance gradually rises. This causes the water pressure in the pipeline of the raw water pressure switch to gradually increase. Once the water pressure of the raw water pressure switch reaches the rated high pressure value, its normally closed contact de-energizes and shuts down the water pump, raw water solenoid valve, and wastewater solenoid valve. Its normally open contact triggers the controller's energizing time relay, opening the wastewater solenoid valve to discharge wastewater. This, in turn, opens the pure water solenoid valve to release pure water from the pure water pressure tank, which is then divided into two equal-pressure return streams. One stream of pure water is appropriately reduced in flow by the pure water throttling valve and returns to the pure water outlet of the composite filter element. Through several filter holes in the filter pipe, the small foreign matter retained from the previous filtration is squeezed and dissolved from the inside out, detaching it from the outer wall of the reverse osmosis membrane and returning to the support mesh gaps of the membrane module. The other stream of pure water passes through the reverse osmosis membrane... The stop valve, flowing in reverse through the wastewater outlet, also enters the support mesh gap of the membrane module. The two pure water streams converge at equal pressure in the support mesh gap, providing a dynamic balance between the external and internal water pressures of the reverse osmosis membrane. This not only prevents back pressure on the composite filter element but also allows for comprehensive backwashing of the membrane module, flushing away foreign matter trapped in the support mesh gap, inlet face, and filter cotton from the previous filtration process. This wastewater is then converted into sewage and passes through the sewage throttling valve. While maintaining the external water pressure of the reverse osmosis membrane, the sewage throttling valve reduces flow and seals the pressure to release the sewage. The sewage is discharged through the sewage solenoid valve. After a suitable period of time, the controller's time-delay relay is de-energized, closing the sewage and pure water solenoid valves. At this point, the raw water pressure switch pipeline has returned to normal, and its normally closed contact has reset. Simultaneously with the de-energization of the controller's time-delay relay, the water pump and raw water solenoid valve are energized, and the wastewater solenoid valve is opened to continue purifying the produced water.

[0048] Beneficial effects: The frequency of backwashing is dynamically proportional to the concentration of foreign matter and ions in the raw water. Therefore, by using a raw water pressure switch to dynamically sense and initiate backwashing, the problem of scale buildup during long-term continuous operation can be solved. Timely backwashing removes dirt and ions trapped on the composite filter cartridge and membrane module, as well as those on the reverse osmosis membrane wall, thereby reducing water resistance and increasing the pure water output ratio. The raw water pressure switch can dynamically detect different types of raw water, such as seawater, river water, well water, and tap water. By using a pressure stabilizing valve, the peak and valley water pressure of the water pump can be stabilized. Combined with the raw water pressure switch, the dynamic pressure of the raw water can be accurately detected, triggering the controller to initiate backwashing in a timely manner, achieving the purpose of intelligent cleaning of the composite filter cartridge. This enables the continuous and uninterrupted production of pure water from well water, river water, and seawater through the separate water purifier, breaking through the technical bottleneck of continuously separating and producing fresh water from seawater through a portable water purifier.

[0049] In conjunction with the water purifier in the second aspect, a further solution also includes a concentrated wastewater discharge pipeline, which includes:

[0050] The concentrate check valve has its inlet end connected to the pure water outlet of the filter element or composite filter element, and its outlet end connected to the inlet end of the concentrate solenoid valve.

[0051] The concentrated water solenoid valve has its inlet end connected to the outlet end of the concentrated water check valve, and its outlet end connected to the pipeline at the outlet end of the wastewater solenoid valve.

[0052] Beneficial effects: By adopting the concentrated water discharge pipeline technology, each time the water purifier is started, the controller first opens the concentrated water solenoid valve, and a small amount of water remaining in the filter cartridge or composite filter cartridge enters the wastewater pipeline at the outlet of the wastewater solenoid valve. Then, the concentrated water solenoid valve is closed in time to continue water production, removing a small amount of concentrated water interference in the remaining water, resulting in purer drinking water. The use of a concentrated water check valve can prevent other water flows from accidentally flowing back into the pure water output pipeline of the filter cartridge.

[0053] In conjunction with the water purifier in the second aspect, a further solution also includes wastewater utilization piping, which includes:

[0054] Wastewater pressure tank, connected between wastewater inlet and washing pipe;

[0055] Wastewater pressure switch, connected between the outlet of wastewater solenoid valve and wastewater interface;

[0056] The wastewater check valve has its inlet end connected to the wastewater outlet pipe of the filter element, and its outlet end connected to the inlet end of the wastewater solenoid valve.

[0057] Beneficial effects: By adopting the technical solution of wastewater utilization pipeline, the wastewater check valve can control wastewater to only flow out and not in, avoiding backflow into the filter element; the circuit connection controller of the wastewater pressure switch can control the wastewater pressure tank to store wastewater at an appropriate pressure for domestic washing, meeting the needs of users in water-scarce areas, and also achieving the needs of water conservation, emission reduction and environmental protection.

[0058] In conjunction with the water purifier in the second aspect, further solutions also include downstream piping or several stages of repeated purification piping, with the upstream piping including a composite filter element, and also including:

[0059] A water pump is connected between the raw water pipe interface and the raw water inlet of the composite filter element.

[0060] The check valve connects the inlet end to the pipeline between the pure water outlet of the composite filter element and the pure water pressure switch, and the outlet end connects the pipeline between the wastewater outlet of the composite filter element and the wastewater throttle valve.

[0061] A pure water solenoid valve is connected between the pure water pressure switch and the inlet end of the check valve and the outlet end of the pure water check valve in the pipeline.

[0062] The pure water throttling valve is connected to the pure water outlet of the composite filter element, the inlet of the check valve, and the outlet of the pure water solenoid valve.

[0063] Between the water-connected pipes;

[0064] Wastewater throttling valve is connected between the wastewater outlet of the composite filter element and the inlet of the wastewater solenoid valve;

[0065] Wastewater solenoid valve is connected between the wastewater throttling valve and the sewage solenoid valve outlet and sewage interface in the pipeline.

[0066] The pure water check valve has its inlet end connected to the pure water outlet of the composite filter element, and its outlet end connected to the pipeline between the outlet end of the pure water solenoid valve and the pure water throttle valve.

[0067] The downstream piping is a repetition of the upstream piping, with the downstream filter element replacing the upstream composite filter element. The downstream filter element's inlet pipe connects to the upstream pure water solenoid valve's outlet pipe, and the upstream pure water solenoid valve's inlet pipe connects to the downstream water pump's inlet pipe. The downstream piping also includes:

[0068] A pure water pressure tank is connected between the pure water outlet pipe of the filter element and the pure water interface.

[0069] A pure water pressure switch is connected between the pure water outlet of the filter element and the pure water pressure tank.

[0070] The wastewater check valve has its inlet end connected to the outlet end of the downstream wastewater solenoid valve, and its outlet end connected to the inlet end of the raw water solenoid valve.

[0071] The pre-piping also includes:

[0072] A pressure regulating valve is connected between the water pump outlet and the filter element inlet pipe.

[0073] Raw water pressure switch, connected to the outlet of the pressure regulating valve;

[0074] The wastewater throttling valve connects the inlet end to the pipe connecting the outlet end of the water pump and the raw water inlet of the filter element.

[0075] The end is connected to the inlet end of the sewage solenoid valve;

[0076] The sewage solenoid valve has its inlet end connected to the sewage throttle valve and its outlet end connected to the sewage interface.

[0077] The controller is connected to the circuits of various types of pressure switches, water pumps, and solenoid valves.

[0078] Beneficial effects: By adopting a technology solution of repeated purification pipelines, both filter cartridges and composite filter cartridges can be backwashed and self-cleaned, and the raw water used for seawater desalination or high concentration of dirt can produce pure drinking water.

[0079] In conjunction with the water purifier in the second aspect, further solutions for the repeated purification pipeline also include multiple filter cartridge purification pipelines, including:

[0080] The filter cotton cartridge is connected between the raw water inlet of the pre-stage composite filter cartridge and the sewage solenoid valve.

[0081] The activated carbon filter element is connected between the pure water interface and the external pure water delivery pipeline.

[0082] Beneficial effects: By using the activated carbon filter element connected to the pure water interface of the water purifier, it prevents dirt and grime buildup and facilitates regular replacement. The filter cotton element connected to the inlet pipe of the wastewater solenoid valve also allows for thorough backwashing and self-cleaning, achieving long-term use without replacement. This multi-stage filter purification technology is suitable for raw water with high concentrations of impurities and for scenarios with high-volume, continuous pure water supply, reducing backwashing frequency and producing purer drinking water.

[0083] In summary, this application provides a forward and reverse washing filter element, a separate water purifier, and its automatic backwashing method. It improves the reverse osmosis filter element by changing its structure from a single forward washing filter element to a forward and reverse washing filter element structure. It adopts a technical solution of pressure switch and controller automatic switching circuit to divide the pure water in the pure water pressure tank into two backflow automatic backwashing methods, avoiding back pressure in the filter element. It breaks through the technical bottleneck of the innovation of the filter-type water purifier into a separate water purifier, and realizes that the reverse osmosis filter element always maintains a clean and hygienic state to purify and separate pure water and achieves the purpose of not needing to replace it for a long time. Attached Figure Description

[0084] In the diagram: solid lines represent pipes, dashed lines represent circuits or water flow, and arrows indicate the direction of water flow.

[0085] Figure reference numerals: 10, Filter element; 11, Composite filter element; 12, Filter cotton filter element; 13, Activated carbon filter element; 20, Shell; 21, Raw water inlet; 22, Pure water outlet; 23, Wastewater outlet; 30, Filter pipe; 31, Filter hole; 40, Membrane module; 41, Support mesh; 42, Reverse osmosis membrane; 43, Foreign matter filter layer; 50, Positioning support; 60, Positioning terminal; 61, Composite terminal; 62, Round tube; 63, Hollowed-out base; 64, Hollowed-out inner cover; 65, Sealing ring; 66, Filter cotton; 70, Pure water pressure switch; 71, Raw water pressure switch; 72, Wastewater outlet. Water pressure switch; 80. Pure water pressure tank; 81. Wastewater pressure tank; 90. Raw water solenoid valve; 91. Sewage solenoid valve; 92. Wastewater solenoid valve; 93. Pure water solenoid valve; 94. Concentrated water solenoid valve; 100. Water pump; 110. Wastewater throttling valve; 111. Sewage throttling valve; 112. Pure water throttling valve; 120. Check valve; 121. Pure water check valve; 122. Concentrated water check valve; 123. Wastewater check valve; 130. Controller; 140. Pressure regulating valve; 150. Raw water interface; 151. Sewage interface; 152. Pure water interface; 153. Wastewater interface.

[0086] Figure 1 This is a structural elevation view of the embodiment of the forward and reverse washing filter cartridge separation water production method of this application;

[0087] Figure 2 for Figure 1 A sectional view of the AA position in the plan;

[0088] Figure 3 This is a structural elevation view of the composite filter element backwashing embodiment of this application;

[0089] Figure 4 for Figure 3 BB position plan sectional view;

[0090] Figure 5 This is a schematic diagram of the raw water separation and product water pipeline connection in the second embodiment of the water purifier of this application;

[0091] Figure 6 This is a schematic diagram of the quantitative backwashing pipeline connection in the second embodiment of the water purifier of this application;

[0092] Figure 7 This is a schematic diagram of the quantitative backwashing pipeline connection in the third embodiment of the water purifier of this application;

[0093] Figure 8 This is a schematic diagram of the intelligent backwashing and concentrated water discharge pipeline connection of the fourth embodiment of the water purifier in this application;

[0094] Figure 9 This is a schematic diagram of the pipeline connection for separating product water and wastewater in the fifth embodiment of the water purifier of this application;

[0095] Figure 10 This is a schematic diagram of the intelligent backwashing and repeated purification pipeline connection of the water purifier in the sixth embodiment of this application;

[0096] Figure 11 This is a schematic diagram of the intelligent backwashing and multi-filter purification pipeline connection of the seventh embodiment of the water purifier of this application. Detailed Implementation

[0097] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the utility model will be further described in detail below with reference to the accompanying drawings. The components of the embodiments of this utility model described and shown in the accompanying drawings can be arranged and designed in various different configurations. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort are within the scope of protection of this utility model.

[0098] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0099] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "connection," "aggregate," and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0100] In the description of this application, it should be understood that the terms "left side", "right side", "one side", "one end", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and 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 orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0101] The embodiments of this utility model will now be described in detail with reference to the accompanying drawings. Unless otherwise specified, the features in the following embodiments can be combined with each other.

[0102] Example 1, such as Figure 1 , Figure 2 As shown, this embodiment discloses a forward and reverse washing filter element (hereinafter referred to as filter element), including a housing 20, a water filter pipe 30, a membrane module 40, a positioning terminal 60, and a positioning support 50.

[0103] The shell 20 is bottle-shaped, with a pure water outlet 22 and a wastewater outlet 23 at one end of the bottom, and a raw water inlet 21 at the other end;

[0104] The filter pipe 30 has several through filter holes 31 on both sides of its wall, and the opening of the filter pipe 30 abuts against the pure water outlet 22 of the housing 20;

[0105] The membrane module 40 includes a support net 41 and a reverse osmosis membrane 42. The reverse osmosis membrane 42 is made into a three-sided closed pocket by sandwiching a support net 41 between two reverse osmosis fabrics. The pocket openings of several reverse osmosis membranes 42 are connected to several filter holes 31. The edges of the pocket openings are sealed against the outer wall of the filter pipe 30. Several support nets 41 are respectively set between the gaps of each reverse osmosis membrane 42. Several support nets 41 and several reverse osmosis membranes 42 are closely attached to the outer wall of the filter pipe 30 and wrapped several times to form a cylindrical membrane module 40.

[0106] The positioning terminal 60 includes a circular tube 62 and a hollow base 63. The outer diameter of the outer circular tube 62 is slightly smaller than the inner diameter of the housing 20. One end of the circular tube 62 is movably abutted against the inner wall of the housing 20 at one end of the raw water inlet 21, and the other end is connected to the hollow base 63. The circular hole in the center of the hollow base 63 is fitted onto the outer wall of the filter tube 30, and the hollow base 63 is movably abutted against the inlet end face of the membrane module 40.

[0107] The positioning support 50 includes several support plates, one end of which is connected to the inner wall of the pure water outlet 22 of the housing 20, and the other end is movably abutting against the outlet end face of the membrane module 40.

[0108] By adopting the technical solution of positioning support 50, the positioning support 50 fixes the outlet end face of membrane module 40, preventing membrane module 40 from twisting and moving in the direction of forward high-pressure water flow, and avoiding deformation of the outlet end face of membrane module 40 from the plane to the concave surface. This avoids frequent reciprocating movement of membrane module 40 with forward and reverse high-pressure water flow, laying the foundation for backwashing of the split water purifier.

[0109] By adopting the forward and reverse washing filter cartridge 10 technology, it can replace the multiple filter cartridges that trap dirt and grime. The forward and reverse washing filter cartridge 10 does not adsorb or retain much dirt, and it is easy to clean it in time by backwashing. It is suitable for the separation and purification of relatively clean tap water and can maintain self-cleaning operation for a long time to produce pure water.

[0110] like Figure 3 , Figure 4 As shown, filter element 10 also includes composite filter element 11, which includes membrane module 40 and composite terminal 61. Composite terminal 61 includes:

[0111] The hollow inner cover 64 is movably connected to the inner opening of the round tube 62 at its edge;

[0112] The round tube 62 has one end that is in contact with the inner wall of the raw water inlet 21 of the shell 20, and the other end is connected to the hollow base 63.

[0113] The hollow base 63 has a round hole in the center, which is fitted into the water filter pipe 30 at the center of the inlet end face of the membrane module 40. The hollow base 63 abuts against the inlet end face of the membrane module 40.

[0114] A sealing ring 65 is disposed between the outer wall of the circular tube 62 and the inner wall of the housing 20;

[0115] Filter cotton 66 is installed inside the cavity of the round tube 62;

[0116] By using the circular hole of the composite terminal 61 chassis to fit and be sleeved onto the outer wall of the central filter tube 30 at the inlet end face of the membrane module 40, and combining the sealing ring 65 set between the outer wall of the circular tube 62 near the hollow chassis 63 and the inner wall of the housing 20, the membrane module 40 is fixed in the center position of the composite filter element 11, eliminating the inlet pipe of the existing reverse osmosis filter element, and providing a suitable space for the filter cotton 66 to be set in the inner cavity of the circular tube 62 of the composite terminal 61. By using composite filter cartridges, it can be applied to scenarios where the raw water is seawater, river water, well water, etc., which contain high levels of dirt and salt. On the one hand, the raw water is pumped into the raw water inlet of the composite filter cartridge and passes through the filter cotton in the inner cavity of the composite terminal to initially filter out a large amount of dirt before entering the membrane module to separate and produce pure water. On the other hand, after the pure water backwashes the membrane module, it also backwashes the filter cotton, achieving the purpose of self-cleaning of the composite filter cartridge. This also eliminates the need for activated carbon and multi-stage filter cartridges that harbor dirt and grime, and can also separate raw water with a high content of dirt and foreign matter, achieving the purpose of continuous purification and separation to produce pure water.

[0117] Example 2, as follows Figure 5 and Figure 3 , Figure 4 As shown, this embodiment discloses a split-type water purifier (hereinafter referred to as a water purifier), including a composite filter element 11 and pipelines:

[0118] A water pump 100 is connected between the raw water interface 150 and the raw water inlet 21 of the composite filter element 11.

[0119] A pure water pressure tank 80 is connected between the pure water outlet 22 of the composite filter element 11 and the pure water interface 152.

[0120] A pure water pressure switch 70 is connected between the pure water outlet 22 of the composite filter element 11 and the pure water pressure tank 80.

[0121] Wastewater solenoid valve 92, with its inlet end connected to the wastewater outlet 23 pipeline of composite filter element 11, and its outlet end connected to wastewater interface 153;

[0122] The check valve 120 has an inlet end connected to the pure water outlet 22 of the composite filter element 11 and the pure water pressure switch 70, and an outlet end connected to the wastewater outlet 23 of the composite filter element 11 and the wastewater solenoid valve 92.

[0123] Wastewater throttling valve 110 is connected between the wastewater outlet 23 pipeline of composite filter element 11 and the inlet end of wastewater solenoid valve 92;

[0124] The sewage throttling valve 111 has its inlet end connected to the pipeline connecting the outlet end of the water pump 100 and the raw water inlet of the composite filter element 11, and its outlet end connected to the inlet end of the sewage solenoid valve 91.

[0125] The sewage solenoid valve has its inlet end connected to the sewage throttle valve 111 and its outlet end connected to the sewage interface 151.

[0126] The controller 130 is connected to the circuits of various pressure switches and solenoid valves of the water pump 100, including automatic control of switching between raw water to produce pure water and backwashing process.

[0127] By employing the wastewater solenoid valve 111, the wastewater throttling valve 111 can slowly release wastewater while maintaining the water pressure outside the reverse osmosis membrane 42. Firstly, this prevents the water pressure outside the reverse osmosis membrane 42 from rapidly dropping below the water pressure inside the membrane, thus avoiding back pressure damage. Secondly, it prevents excessive backflow of pure water from causing a momentary pressure drop in the pure water pressure switch 70, which would lead to disordered activation of the pure water pressure switch 70 and hinder water production. The composite filter element 11 technology is suitable for separating and purifying seawater, river water, well water, and other raw water containing impurities and high salt concentrations.

[0128] Connect the raw water inlet 150 of the water purifier to the river water, the sewage inlet 151 to the drainage pipe, and the pure water inlet 152 to the pure water delivery pipe. Connect the machine to the power supply. When the pure water pressure tank 80 is short of water, the water pressure on the pure water outlet 22 of the composite filter element 11 will decrease. When the water pressure in the pure water pressure switch 70 drops to the rated value, the normally closed contact of the pure water pressure switch 70 will reset and connect the circuit, opening the wastewater solenoid valve 92 and starting the self-priming booster pump 100 to force river water into the composite filter element 11. After passing through the filter cotton 66 in the inner cavity of the composite terminal 61, a large amount of dirt can be initially filtered out. Then, after passing through the inlet end face of the membrane module 40, foreign objects in the river water are filtered out by the inlet end face of the membrane module 40. The membrane module 40 intercepts and gradually accumulates foreign matter to form a foreign matter filter layer 43. On one hand, the raw water is subsequently filtered by the foreign matter filter layer 43 and the membrane module 40 to remove ions, viruses, bacteria, and tiny foreign matter. Under osmotic pressure, a portion of pure water is separated through the reverse osmosis membrane 42 and enters the filter holes 31, filter pipe 30, pure water outlet 22, and pure water pressure switch 70. It is then pressurized into the pure water pressure tank 80 for storage and backup. A high-flow-rate drinking water can be output by connecting to the pure water interface 152 to meet rapid demand. On the other hand, the remaining raw water and tiny foreign matter are concentrated into wastewater. The wastewater passes through the positioning support 50 and wastewater outlet 23 into the wastewater throttling valve 110. The wastewater throttling valve 110 throttles the flow according to the wastewater ratio while maintaining reverse osmosis pressure. The wastewater is then input to the wastewater solenoid valve 92 and wastewater interface 153 to connect to the discharge pipe. Figure 6As shown, when the water tap connected to the pure water interface 152 is closed or the pure water pressure tank 80 reaches the rated water storage capacity, the pressure on the pure water outlet 22 pipeline of the composite filter element 11 will increase. When the pipeline water pressure of the pure water pressure switch 70 reaches the rated high pressure value, its normally closed contact will de-energize the water pump 100, close the wastewater solenoid valve 92, trigger the time delay relay of the controller 130 to open the sewage solenoid valve 91 to discharge sewage, and release the pure water pressure tank 80. The pure water is divided into two equal pressure return streams. One stream of pure water flows in reverse through the filter water pipe 30 and several filter holes 31, squeezing and dissolving the tiny foreign matter retained in the previous filtration from the inside out, removing it from the outer wall of the reverse osmosis membrane 42, and reaching the gap of the support mesh 41. Another stream of pure water enters the wastewater outlet 23 of the filter element 10 through the check valve 120, and also reaches the gap of the support mesh 41. The two streams of water converge at the gap of the support mesh 41, which provides a relative balance between the water pressure on the outside and the water pressure on the inside of the reverse osmosis membrane 42. This not only avoids back pressure on the composite filter element 11, but also allows for all-round backwashing of the membrane assembly 40. This washes away the foreign matter filter layer 43 that was previously filtered and retained in the gap of the support mesh 41 and near the inlet end face, and then washes away the dirt retained in the filter cotton 66 inside the composite terminal 61. The wastewater is then turned into sewage and flows out from the raw water inlet 21. The sewage is output in reverse from the raw water inlet 21 and passes through the sewage throttling valve 111. The sewage throttling valve 111 slowly releases the sewage while maintaining the water pressure on the outside of the reverse osmosis membrane. The sewage is discharged through the sewage solenoid valve 91 into the sewage interface 151. Once the dirt is washed clean, the time delay relay of the controller 130 will de-energize and close the sewage solenoid valve 91 in time. When the pure water pressure tank 80 is low on water, the normally closed contact of the pure water pressure switch 70 will reset and connect the circuit, restarting the water pump 100 to produce water again.

[0129] This embodiment provides a method for automatic backwashing of the composite filter element 11 combined with a pure water pressure switch 70, achieving automatic backwashing of the composite filter element 11. This water purifier has a simple and reliable structure, small size, and does not require replacement of the composite filter element 11 for long-term use. It is suitable for treating and purifying river water in rural areas for use as household drinking water. The implementation schemes for connecting the pressure switch sensor and controller, along with their relays and time-delay relay circuits to switch various solenoid valves, also include other circuit connections for automatic backwashing activation. These are all existing conventional technologies and will not be listed in detail. Implementation can be selected according to actual needs.

[0130] Example 3, as follows Figure 7 , Figure 1 , Figure 2 As shown, the difference between this embodiment and Embodiment 2 is that the water purifier also includes a backwash flow restriction pipeline and a pure water control pipeline. The backwash flow restriction pipeline includes:

[0131] Pure water throttle valve 112 is connected between pure water pressure switch 70 and pure water outlet 22 pipeline;

[0132] The pure water check valve 121 has an inlet end connected to the pure water outlet 22 pipeline, and an outlet end connected between the outlet end of the pure water pressure switch 70 and the pure water throttle valve 112 pipeline.

[0133] The raw water solenoid valve 90 is connected between the raw water interface 150 and the inlet of the water pump 100;

[0134] The pure water control pipeline includes: a pure water solenoid valve 93, connected to the outlet of the pure water pressure switch 70 and the check valve 120, and the pure water...

[0135] Between the pipes connected to the water throttle valve 112;

[0136] The circuits of various types of pressure switches, solenoid valves and water pumps 100 are connected to the controller 130.

[0137] By adopting a backwashing flow-limiting pipeline technology, the pure water check valve 121 introduces pure water into the pure water throttling valve 112, the rated pure water return flow rate into the filter pipe 30, and the rated pure water return flow rate of the sewage throttling valve 111 into the membrane assembly 40, thus improving the backwashing efficiency in a coordinated manner. For scenarios where the raw water supply pipeline has normal water pressure, by closing the raw water solenoid valve 90 in a timely manner, the raw water can be prevented from entering the sewage solenoid valve 91 and being discharged with the sewage, thus avoiding waste.

[0138] By employing a pure water solenoid valve 93 in the pure water control pipeline, when power is off, the pure water solenoid valve 93 can reverse the flow of pure water into the pure water pressure tank, and also has a normal state where it cannot discharge water in the forward direction. When water production stops, the pure water solenoid valve 93 is in the closed state for forward flow, which can prevent pure water from flowing back into the filter element 10 of the pure water pressure tank 80. The water pressure of the filter element 10 can be released by opening the sewage solenoid valve 91 through the controller 130, avoiding pressure fatigue of the filter element 10 during shutdown and thus improving its service life. When water production stops, the sewage solenoid valve 91 and the pure water solenoid valve 93 can also be opened by energizing the controller 130 to release pure water backflow for backwashing the filter element 10.

[0139] The backwash flow restriction pipeline and the pure water control pipeline are applicable to the water purifier combination described in any embodiment.

[0140] like Figure 8As shown, the water purifier also includes a raw water pressure switch 71 and a pressure regulating valve 140, which are connected in series. The inlet of the pressure regulating valve 140 is connected to the pipeline connecting the raw water inlet 21 of the composite filter element 11 and the outlet of the water pump 100. The circuit of the raw water pressure switch 71 is connected to the controller 130. In this embodiment, the water purifier can reduce the peak and valley pressure changes of the water pump 100 by setting the pressure regulating valve 140, which plays a role in coordinating with the raw water pressure switch 71 to accurately detect the rated pressure value. Connect the raw water inlet 150 of the split-type water purifier to the tap water supply pipe, turn on the power to the machine, and power the controller 130 to the water pump 100, raw water solenoid valve 90, and wastewater solenoid valve 92, pressurizing tap water into the raw water inlet 21 of the composite filter element 11. After passing through the positioning terminal 60 and the inlet end face of the membrane module 40, the impurities in the raw water are filtered and retained by the inlet end face of the membrane module 40, and gradually accumulate to form a foreign matter filter layer 43. Subsequently, the raw water is filtered by the foreign matter filter layer 43 and the membrane module 40 in a coordinated manner, on the one hand, the raw water... Tiny foreign objects, ions, bacteria, and viruses in the water are isolated by the reverse osmosis membrane 42, and a portion of pure water is produced by separation through the reverse osmosis membrane 42 under osmotic pressure. The pure water passes through the filter holes 31 and pure water outlet 22 of the filter water pipe 30, and is pressed into the pure water pressure tank 80 through the pure water check valve 121 and pure water solenoid valve 93. On the other hand, the remaining raw water and tiny foreign objects are concentrated into wastewater. The wastewater passes through the positioning support 50 and wastewater outlet 23, and is discharged into the wastewater pipeline through the wastewater throttling valve 110 and wastewater solenoid valve 92.As the raw water continues to flow, the density of the foreign matter filter layer 43 increases, causing the water pressure in the raw water inlet 21 to gradually increase. When the water pressure in the raw water inlet 21 reaches the rated value, the normally closed contact of the raw water pressure switch 71 will de-energize and shut down the water pump 100, the raw water solenoid valve 90, and the wastewater solenoid valve 92. Its normally open contact will then trigger the controller 130, energizing and opening the wastewater solenoid valve 91 and the pure water solenoid valve 93. Pure water from pressure tank 80 is diverted into two streams that flow back at equal pressure. One stream passes through a flow control valve 112, where the flow is appropriately reduced. The pure water then passes through several filter holes 31 in the filter pipe 30, where it is forced from the inside out, dissolving and removing small impurities retained from the previous filtration process. These impurities are then removed from the outer wall of the reverse osmosis membrane 42 and flow back to the support mesh 41 of the membrane module 40. The other stream of pure water flows backward through check valve 120 into the wastewater outlet 23. The water also enters the gaps of the support mesh 41 of the membrane module 40. The two pure water streams converge at equal water pressure in the gaps of the support mesh 41, providing a dynamic balance between the water pressure on the outside and inside of the reverse osmosis membrane 42. This avoids back pressure on the composite filter element 11 and allows for comprehensive backwashing of the membrane module 40, flushing away foreign matter from the previous filtration that remained in the gaps of the support mesh 41, the inlet end face, and the filter cotton 66, turning it into wastewater. The wastewater passes through the wastewater throttling valve 111, which appropriately seals and throttles the wastewater while maintaining the water pressure on the outside of the reverse osmosis membrane 42. The wastewater is discharged through the wastewater solenoid valve 91. After the controller 130 has removed the dirt for an appropriate period of time, the water pressure on the raw water pressure switch 71 has decreased, and its normally closed contact has been reset. The controller 130 will then de-energize and close the wastewater solenoid valve 91 and the pure water solenoid valve 93, while energizing the water pump 100 and the raw water solenoid valve 90, and opening the wastewater solenoid valve 92 to continue purifying the produced water.

[0141] The backwashing frequency in this embodiment is dynamically proportional to the concentration of foreign matter and its ions in the raw water. Therefore, the intelligent control method of dynamic backwashing using the raw water pressure switch 71 can solve the problem of scale buildup during long-term operation. The use of a pure water throttling valve 112 combined with a pure water check valve 121 can save pure water backflow and increase the pure water output ratio, making it suitable for scenarios requiring continuous purification of tap water and a large supply of pure water. It is also applicable to the water purifier combination described in any of the following embodiments.

[0142] Example 4, as follows Figure 8 As shown, this embodiment further includes a concentrated wastewater discharge pipeline, comprising:

[0143] The concentrate check valve 122 has its inlet end connected to the pure water outlet of the composite filter element 11 and its outlet end connected to the inlet end of the concentrate solenoid valve 94.

[0144] The inlet end of the concentrated water solenoid valve 94 is connected to the outlet end of the concentrated water check valve 122, and the outlet end is connected to the pipeline of the outlet end of the wastewater solenoid valve 92.

[0145] By employing a concentrated water discharge pipeline, each time the water purifier is started, the controller 130 first opens the concentrated water solenoid valve 94 to discharge a small amount of water remaining in the composite filter element 11, and then closes the concentrated water solenoid valve 94 in a timely manner to continue water production. This process removes a small amount of concentrated water, resulting in purer drinking water. The concentrated water discharge pipeline is also applicable to any of the water purifier combinations described in the embodiments.

[0146] Example 5, as Figure 9 , Figure 1 and Figure 2 As shown, this embodiment further includes a wastewater utilization pipeline, comprising:

[0147] Wastewater pressure tank 81 is connected between wastewater pressure switch 72 and wastewater interface 153;

[0148] Wastewater pressure switch 72 is connected between the outlet of wastewater solenoid valve 92 and wastewater pressure tank 81;

[0149] Wastewater check valve 123 has its inlet end connected to wastewater outlet 23 and its outlet end connected to the inlet end of wastewater solenoid valve 92.

[0150] The circuits for various types of pressure switches and solenoid valves are connected to the controller 130.

[0151] By employing a wastewater utilization pipeline, the wastewater check valve 123 can control wastewater to flow out only and not into the filter element 10's wastewater outlet 23. The circuit connection controller 130 of the wastewater pressure switch 72 can store an appropriate amount of washing water in the rated wastewater pressure tank 81, while maintaining a suitable pressure for domestic washing, thus meeting the water conservation needs of tap water users in water-scarce areas. This also applies to the water purifier combination described in any embodiment, achieving the purpose of water conservation, emission reduction, and environmental protection.

[0152] Example 6, as Figure 10 As shown, this embodiment differs from the above embodiments in that the water purifier in this embodiment further includes a repeated purification pipeline or several stages of repeated purification pipelines. The repeated purification pipeline includes a pre-stage pipeline and a post-stage pipeline. The pre-stage pipeline includes a composite filter element 11, and also includes:

[0153] Water pump 100 is connected between the raw water pipe interface and the raw water inlet 21 of composite filter element 11;

[0154] The check valve 120 has an inlet end connected to the pipeline between the pure water outlet 22 of the composite filter element 11 and the pure water pressure switch 70, and an outlet end connected to the pipeline between the wastewater outlet 23 of the composite filter element 11 and the wastewater throttle valve 110.

[0155] Pure water solenoid valve 93 is connected between the pure water pressure switch 70 and the inlet end of check valve 120 and the outlet end of pure water check valve 121 in the pipeline.

[0156] Pure water throttling valve 112 is connected between the pure water outlet 22 of composite filter element 11 and the water inlet of check valve 120 and the water outlet of pure water solenoid valve 93.

[0157] Wastewater throttling valve 110 is connected between wastewater outlet 23 of composite filter element 11 and inlet of wastewater solenoid valve 92;

[0158] Wastewater solenoid valve 92 is connected between wastewater throttling valve 110 and the pipeline connecting the outlet end of sewage solenoid valve 91 and sewage interface 151.

[0159] The pure water check valve 121 has its inlet end connected to the pure water outlet 22 of the composite filter element 11, and its outlet end connected to the pure water solenoid valve 93.

[0160] The outlet end is connected to the pipeline of the pure water throttling valve 112.

[0161] The downstream piping is a repetition of the upstream piping, wherein the downstream filter element 10 replaces the upstream composite filter element 11. The inlet pipe of the downstream filter element 10 is connected to the outlet of the upstream pure water solenoid valve 93, and the inlet pipe of the upstream pure water solenoid valve 93 is connected to the inlet of the downstream water pump 100. The downstream piping also includes:

[0162] A pure water pressure tank 80 is connected between the pure water outlet of filter element 10 and the pure water interface 152.

[0163] A pure water pressure switch 70 is connected between the pure water outlet of the filter element 10 and the pure water pressure tank 80.

[0164] The wastewater check valve 123 has its inlet end connected to the outlet end of the downstream wastewater solenoid valve 92, and its outlet end connected to the inlet end of the raw water solenoid valve 90.

[0165] The pre-piping also includes:

[0166] The sewage throttling valve 111 is connected at its inlet end to the pipeline connecting the raw water inlet 21 of the composite filter element 11 and the self-priming pump 100.

[0167] The outlet end is connected to the inlet end of the sewage solenoid valve 91;

[0168] The sewage solenoid valve 91 has its inlet end connected to the sewage throttle valve 111 and its outlet end connected to the sewage interface 151.

[0169] Pressure stabilizing valve 140 is connected to the pipeline between raw water pressure switch 71 and water pump 100 outlet end;

[0170] The controller 130 is connected to the circuits of various types of pressure switches, water pumps 100, and solenoid valves.

[0171] In this embodiment, the wastewater check valve 123 has an outflow-only structure to prevent raw water backflow. The low-concentration wastewater from the subsequent separation is input to the inlet of the raw water solenoid valve 90, allowing for reuse and water conservation. A recirculating purification pipeline is provided, suitable for seawater desalination to produce pure drinking water. It is also applicable to any of the water purifiers described in this embodiment, allowing for combination as needed.

[0172] Beneficial effects: By adopting a repeated purification pipeline technology, both filter element 10 and composite filter element 11 can be backwashed and self-cleaned, and the raw water used for seawater desalination or with high concentrations of dirt and foreign matter can produce pure drinking water.

[0173] Example 7, as follows Figure 11 As shown, the further embodiment of the water purifier's repeated purification pipeline also includes multiple filter cartridge purification pipelines, including:

[0174] The filter cotton element 12 is connected between the raw water inlet 21 of the pre-stage composite filter element 11 and the sewage solenoid valve 111.

[0175] The activated carbon filter element 13 is connected between the pure water interface 152 and the external pure water delivery pipe.

[0176] Beneficial effects: By adopting a multi-stage filter purification technology, the filter cotton cartridge 12 can also be fully backwashed and self-cleaned. It is suitable for raw water with high concentrations of dirt and impurities, as well as scenarios requiring a continuous supply of pure water. It will not accumulate dirt and grime, and long-term use does not require replacement of the forward and reverse washing filter cartridge 10, composite filter cartridge 11, or filter cotton cartridge 12, and it produces purer drinking water. The activated carbon filter cartridge 13 is connected to the pure water interface 152 and is externally placed in the water purifier, preventing contamination by foreign matter and facilitating regular replacement. It is suitable for separating and purifying different water sources such as seawater, well water, and river water with high salt content and heavy impurities to produce pure water. It also enables the desalination and separation of seawater to produce pure water using a portable water purifier.

[0177] The beneficial effects of this separate-type water purifier are as follows: By improving the reverse osmosis filter structure, the basic conditions for reverse flushing are achieved. A pressure sensor and controller 130 are used to switch various solenoid valve pipelines in a timely manner, releasing pure water from the pure water pressure tank 80 and allowing it to flow back at equal pressure. This backwashes the filter element 10 or composite filter element 11 in an appropriate amount, ensuring it remains in a hygienic and clean state to separate and purify well water, river water, or seawater to produce pure water. This water purifier abandons the multi-stage filtration method of existing water purifiers that traps dirt and grime. It innovatively achieves the goal of eliminating the need to replace filter element 10 or composite filter element 11 through backwashing, solving the problem of multi-stage filter element consumption in the prior art and eliminating dirt and grime accumulation in filter element 10 or composite filter element 11, preventing long-term fermentation of dirt and ensuring the safety of pure water for direct drinking. The use of a high-pressure pure water pressure tank also meets the need for high-flow pure water output, solving the practical need for immediate water use.

[0178] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes, modifications, substitutions, and variations can be made to this utility model without departing from its spirit and scope, and all such changes, modifications, substitutions, and variations are included within the scope of this utility model as claimed.

Claims

1. A forward and reverse washing filter element, characterized in that, include: The casing is bottle-shaped, with a pure water outlet and a wastewater outlet at one end of the bottom, and a raw water inlet at the other end; The filter pipe has several through-holes on both sides of the pipe wall. One end of the filter pipe is inserted into the pure water outlet of the housing, and the other end is closed and inserted into the round hole of the positioning terminal base. A membrane module includes a support mesh and a reverse osmosis membrane. The reverse osmosis membrane is configured as a three-sided closed pocket made of two reverse osmosis fabrics sandwiching a support mesh. The pocket openings of the reverse osmosis membranes are all connected to the filter holes. The edges of the pocket openings are sealed against the outer wall of the filter tube. The support mesh is placed between every two reverse osmosis membranes. The membrane module is tightly attached to the outer wall of the filter tube and wound several times to form a cylindrical membrane module. The positioning terminal includes a round tube and a hollow base plate. The outer diameter of the round tube is smaller than the inner diameter of the shell. One end of the round tube abuts against the inner wall of the shell at one end of the raw water inlet, and the other end is connected to the hollow base plate. The outer diameter of the hollow base plate is larger than the outer diameter of the round tube but not larger than the inner diameter of the shell. The hollow base plate abuts against the inlet end face of the membrane module. The positioning support includes several support plates, one end of which is connected to the inner wall of the bottom end of the housing, and the other end of which abuts against the outlet end face of the membrane assembly.

2. The forward and reverse washing filter element according to claim 1, characterized in that, It also includes a composite filter element, which comprises the membrane module and a composite terminal, the composite terminal comprising: A round tube, one end of which abuts against the inner wall of the raw water inlet of the shell, and the other end of which is connected to the hollow base plate; The hollow base has an outer diameter larger than the outer diameter of the circular tube and smaller than the inner diameter of the shell. The hollow base has a circular hole in the center. The circular hole of the hollow base fits and is sleeved with the outer wall of the closed tube head of the filter tube. The hollow base abuts against the inlet end face of the membrane module. A hollow inner cover, the edge of which is movably connected to the inner opening of the circular tube; A sealing ring is disposed between the outer wall of the circular tube and the inner wall of the housing; Filter cotton is placed inside the cavity of the circular tube.

3. A split-type water purifier, characterized in that, Including the forward and reverse washing filter element as described in claim 1 or 2, it further includes: A water pump is connected between the raw water interface and the raw water inlet of the forward and reverse washing filter element; A pure water pressure tank is connected between the pure water pressure switch and the pure water interface pipeline. A pure water pressure switch is connected between the pure water outlet of the forward and reverse washing filter element and the pure water pressure tank. A wastewater throttling valve is connected between the wastewater outlet of the forward and reverse washing filter element and the inlet of the wastewater solenoid valve. The wastewater solenoid valve has its inlet end connected to the wastewater throttling valve and its outlet end connected to the sewage interface. The check valve has its inlet end connected between the pure water outlet of the forward and reverse washing filter element and the pipeline connected to the pure water pressure switch, and its outlet end connected between the wastewater outlet of the forward and reverse washing filter element and the pipeline connected to the wastewater throttling valve. The sewage throttling valve has its inlet end connected to the pipeline connecting the outlet end of the water pump to the raw water inlet of the forward and reverse washing filter element, and its outlet end connected to the inlet end of the sewage solenoid valve. The sewage solenoid valve has its inlet end connected to the sewage throttling valve and its outlet end connected to the sewage interface. The controller is connected to the circuitry of the pure water pressure switch, solenoid valve, and water pump, and includes automatic control of pure water production and backwashing procedures.

4. The split-type water purifier according to claim 3, characterized in that, It also includes a backwash flow restriction pipeline, which includes: A pure water throttle valve is connected between the pure water outlet of the forward and reverse washing filter element and the inlet of the pure water pressure switch and check valve. The pure water check valve has its inlet end connected to the pure water outlet of the forward and reverse washing filter element, and its outlet end connected to the pipeline connecting the pure water pressure switch and the pure water throttle valve. The raw water solenoid valve is connected between the raw water interface and the water pump inlet.

5. The split-type water purifier according to claim 3, characterized in that, It also includes a pure water solenoid valve for the reflux control pipeline, wherein the inlet end of the pure water solenoid valve is connected to a pure water pressure switch, and the outlet end is connected between the pipeline connecting the inlet end of the check valve and the outlet end of the pure water check valve.

6. The split-type water purifier according to claim 3, characterized in that, It also includes a concentrated wastewater discharge pipeline and a wastewater utilization pipeline, wherein the concentrated wastewater discharge pipeline includes: The concentrated water check valve has its inlet end connected to the pure water outlet of the forward and reverse washing filter element or the composite filter element, and its outlet end connected to the inlet end of the concentrated water solenoid valve. The concentrated water solenoid valve has its inlet end connected to the outlet end of the concentrated water check valve, and its outlet end connected to the discharge pipe of the sewage interface. The pipelines for wastewater utilization include: The wastewater pressure tank is connected between the outlet of the wastewater solenoid valve and the wastewater interface. A wastewater pressure switch is connected between the outlet of the wastewater solenoid valve and the pipeline connecting the wastewater pressure tank. The wastewater check valve has its inlet end connected to the pipeline at the wastewater outlet of the forward and reverse washing filter element, and its outlet end connected to the pipeline at the inlet end of the wastewater solenoid valve.

7. The split-type water purifier according to claim 3, characterized in that, It also includes a repeat purification pipeline, which comprises a pre-stage pipeline and a post-stage pipeline or several post-stage pipelines, wherein the pre-stage pipeline includes a composite filter element, and further includes: A water pump is connected between the raw water pipe interface and the raw water inlet of the composite filter element; The check valve has an inlet end connected to the pipeline between the pure water outlet of the composite filter element and the pure water pressure switch, and an outlet end connected to the pipeline between the wastewater outlet of the composite filter element and the wastewater throttling valve. A pure water solenoid valve is connected between the pure water pressure switch and the pipeline connecting the inlet end of the check valve and the outlet end of the pure water check valve. A pure water throttling valve is connected between the pure water outlet of the composite filter element and the water inlet of the check valve and the water outlet of the pure water solenoid valve. The pure water check valve has its inlet end connected to the pure water outlet of the composite filter element, and its outlet end connected to the pipeline connecting the outlet end of the pure water solenoid valve and the pure water throttling valve. A wastewater throttling valve is connected between the wastewater outlet of the composite filter element and the inlet of the wastewater solenoid valve. Wastewater solenoid valve is connected between the wastewater throttling valve and the sewage solenoid valve outlet end and sewage interface in the pipeline; The downstream pipeline includes: a repetition of the upstream pipeline, wherein the downstream forward and reverse washing filter cartridges correspondingly replace the upstream composite filter cartridges, the inlet pipeline of the forward and reverse washing filter cartridges is connected to the outlet of the upstream pure water solenoid valve, and the inlet pipeline of the upstream pure water solenoid valve is connected to the inlet of the downstream water pump, and further includes: A pure water pressure tank is connected between the pure water outlet of the forward and reverse washing filter element and the pure water interface. A pure water pressure switch is connected between the pure water outlet of the forward and reverse washing filter element and the pure water pressure tank. The pre-piping also includes: A pressure regulating valve is connected between the water pump outlet and the inlet of the forward and reverse washing filter element; The raw water pressure switch is connected to the outlet end of the pressure regulating valve; The sewage throttling valve has its inlet end connected to the pipeline connecting the outlet end of the water pump and the raw water inlet of the composite filter element, and its outlet end connected to the inlet end of the sewage solenoid valve. The sewage solenoid valve has its inlet end connected to the sewage throttling valve and its outlet end connected to the sewage interface. The controller is connected to the circuits of the pure water pressure switch, the raw water pressure switch, the water pump, and the solenoid valve.

8. The split-type water purifier according to claim 3 or 7, characterized in that, It also includes various filter element purification pipelines, which include: The filter cotton cartridge is connected between the raw water inlet of the pre-stage composite filter cartridge and the sewage solenoid valve. The activated carbon filter element is connected between the pure water interface and the external pure water delivery pipeline.

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