Series-parallel connection intelligent switching type double-RO-membrane zero-stale-water water purification pipeline system and water purifier

Abstract

The utility model discloses a series-parallel connection intelligent switching type double-RO-membrane zero-stale-water water purification pipeline system and a water purifier, and belongs to the technical field of water purification equipment. The system mainly comprises a first reverse osmosis filtering subsystem, a second reverse osmosis filtering subsystem, a pure water output subsystem and a backflow loop, the first reverse osmosis filtering subsystem comprises a first electromagnetic valve, a first reverse osmosis RO membrane and a first booster pump; the second reverse osmosis filtering subsystem comprises a second electromagnetic valve, a second reverse osmosis RO membrane and a second booster pump, on one hand, a pure water port of the second reverse osmosis RO membrane is communicated with the pure water output subsystem through a parallel electromagnetic valve, and on the other hand, the pure water port of the second reverse osmosis RO membrane is communicated with an h1 node between the first booster pump and the first electromagnetic valve through a series pipeline provided with a series electromagnetic valve. According to the utility model, the zero-aging water is really realized, the water resource is saved, the water purification flow is large, the service lives of the two RO membranes are long, the system design is simple and easy to implement, the operation is stable and reliable, and the maintenance cost is low.

Description

Technical Field

[0001] The utility model belongs to the technical field of water purification equipment, and more specifically, it particularly relates to a series-parallel intelligent switching double RO membrane zero stale water purification pipeline system and a water purifier, which has a reasonable and ingenious water purification idea, truly realizes "zero stale water", saves water resources, is green and environmentally friendly, has a large water purification flow rate, has a long service life of two RO membranes, has a simple and easy-to-implement system design, runs stably and reliably, and has low maintenance costs. Background Art

[0002] Reverse osmosis water purifiers are generally composed of primary filtration devices (such as PP cotton filter elements, activated carbon filter elements, etc.), booster pumps, RO reverse osmosis membrane components, water inlet valves, wastewater valves, high-pressure switches, low-pressure switches, etc. Reverse osmosis membrane technology is a membrane separation and filtration technology that uses pressure difference as a driving force to separate pure water and wastewater from tap water.

[0003] Reverse osmosis can reduce the total dissolved solids (TDS) of the treated water. Under pressure, water molecules can pass through the RO reverse osmosis membrane, while impurities such as inorganic salts, heavy metal ions, organic matter, colloids, bacteria, viruses, etc. in the water cannot pass through the RO reverse osmosis membrane, thereby strictly distinguishing between pure water that can pass through and wastewater that cannot pass through. Reverse osmosis technology is currently a very clean and effective treatment method in the field of water treatment.

[0004] According to whether there is a storage tank, water purifiers can be divided into bucket-type water purifiers and non-bucket-type water purifiers. The water purification speed of non-bucket-type water purifiers is faster, but its main disadvantage is the problem of stale water. The reason for the formation of so-called "stale water" is that when the water purifier produces water, the water initially filtered by the pre-filter passes through the reverse osmosis membrane, which will produce pure water and waste water. The pure water will be discharged from the faucet, and the waste water will be discharged and discarded. When the water purifier stops, as shown in the figure in the instruction manual Figure 1 As shown, pure water 72, waste water 73 and raw water 74 will remain in the membrane shell 71 of the reverse osmosis membrane. Due to the different osmotic pressures, a osmotic difference will be formed, resulting in two-way osmosis, and the three will slowly mix. Therefore, in the early stage of re-water production, the total dissolved solids (TDS) content of the effluent will temporarily increase, and then gradually return to normal.

[0005] A Chinese patent with application publication number CN117756229A and utility model creation name "water purification system and water purifier" discloses a technical solution for realizing water purification of a water purifier using a double RO membrane, and the solution specifically includes: a water inlet pipeline connected to a water source; a pure water pipeline for outputting pure water; a first reverse osmosis component and a second reverse osmosis component, the raw water inlets of the first reverse osmosis component and the second reverse osmosis component are both connected to the water inlet pipeline; the pure water outlets of the first reverse osmosis component and the second reverse osmosis component are both connected to the pure water pipeline; a backwash pipeline, one end of which is connected to the pure water outlet of the first reverse osmosis component and the other end is connected to the pure water outlet of the second reverse osmosis component: a control circuit, when the water purification system stops making water, the control circuit starts a backwash program, in which the second reverse osmosis component is cut off from the water inlet pipeline, the water inlet pipeline is connected to the backwash pipeline, and the pure water produced by the first reverse osmosis component flows into the second reverse osmosis component through the backwash pipeline. When the water purification system stops producing water, that is, after the water production program ends, the backwashing program starts, the second reverse osmosis component stops producing water, the first reverse osmosis component continues to produce water, and the produced pure water flows back into the second reverse osmosis component through the backwashing pipeline, so as to achieve the backwashing of the second reverse osmosis component. When the water purification system stops producing water, that is, after the water production program ends, the backwashing program starts, the second reverse osmosis component stops producing water, the first reverse osmosis component continues to produce water, and the produced pure water flows back into the second reverse osmosis component through the backwashing pipeline, so as to achieve the backwashing of the second reverse osmosis component. The water purification system also includes a pressure sensor S1 for detecting the pure water outlet pressure of the first reverse osmosis component, and the control circuit is connected to the pressure sensor S1. In the backwashing program, the control circuit receives the pressure signal detected by the pressure sensor S1. When the pressure signal shows that the corresponding pressure is greater than the preset threshold value, the control circuit lowers the flow of the first electric control valve V21, thereby controlling the water pressure of the backwashing pipeline. That is, the back pressure of the second reverse osmosis component is within a certain range, which ensures the normal use of the second reverse osmosis component and reduces the damage to the reverse osmosis membrane caused by excessive back pressure during backwashing. After long-term testing and verification, the reverse osmosis component rolled by the prior art can withstand low-pressure back pressure for a long time without affecting its performance. This back pressure cannot exceed 30PSI. In other words, the upper pressure limit of the pressure sensor S1 is 30PSI, that is, the back pressure of the second reverse osmosis component is controlled within PSI. The flux of the second reverse osmosis component is greater than the flux of the first reverse osmosis component. The second reverse osmosis component is mainly used for water production. A larger flux is conducive to ensuring the flow rate of pure water production. The first reverse osmosis component is mainly used for backwashing the second reverse osmosis component, so the flux used is smaller.

[0006] It can be seen from this that the traditional double RO membrane water purification solution has the following defects:

[0007] 1. This solution only alleviates the stale water problem and plays a role in temporarily reducing the TDS value of stale water. The initial output water of the second water production is still mixed water, and it does not truly achieve "zero stale water". The reason is that in the traditional solution, the backwash pipeline reverses the pure water of the first reverse osmosis component through the pure water outlet of the second reverse osmosis component into the second reverse osmosis component. The pure water flushing makes the second reverse osmosis component full of pure water, but the raw water pipeline connected to the raw water inlet of the second reverse osmosis component is raw water. The existence of osmotic pressure causes the raw water in the raw water pipeline to gradually mix with the pure water in the second reverse osmosis component. The longer the standby time, the higher the TDS value of the mixed water in the second reverse osmosis component. Therefore, the traditional dual RO membrane solution only dilutes the stale water, but does not truly solve the "zero stale water" problem;

[0008] 2. During normal use of the water purifier, water flows in from the raw water inlet of the RO membrane, flows out from the pure water inlet, and waste water is discharged from the concentrated water inlet. This water flow direction is the forward direction. The reverse direction is the opposite. Water flows in from the pure water inlet of the RO membrane, passes through the RO membrane in reverse, and is finally discharged from the raw water inlet or concentrated water inlet. The reverse flushing method requires strict control of the reverse flow back pressure to prevent the RO membrane from being damaged due to excessive back pressure. The traditional solution requires flushing the second reverse osmosis component through this reverse backwashing pipeline. The traditional dual RO membrane requires real-time monitoring of the system back pressure. The system design is complex, costly, and difficult to control. The possibility of damage to the membrane of the second reverse osmosis component is high, and the system stability and reliability are poor.

[0009] 3. The traditional solution uses the backwash pipeline to reversely flush the second reverse osmosis component, and the flushing pure water is directly discharged through the concentrated water outlet of the second reverse osmosis component, resulting in serious waste of water resources;

[0010] 4. The traditional first reverse osmosis component exists to provide flushing pure water for the second reverse osmosis component. Therefore, during the design, the first reverse osmosis component and the second reverse osmosis component have two RO membranes, one with a small capacity and one with a large capacity, and the overall clean water flow rate is small; and the first reverse osmosis component has a fast production speed of stale water, a short service life of the first reverse osmosis component, and a high replacement frequency, which further increases the maintenance cost. Utility Model Content

[0011] The purpose of the utility model is to address the deficiencies in the prior art and to provide a series-parallel intelligent switching double RO membrane zero stale water purification pipeline system and a water purifier that has a reasonable and ingenious water purification idea, truly realizes "zero stale water", saves water resources, is green and environmentally friendly, has a large water purification flow rate, has a long service life of two RO membranes, has a simple and easy implementation system design, operates stably and reliably, and has low maintenance costs.

[0012] The utility model is realized by the following technical solutions:

[0013] A series-parallel intelligent switching double RO membrane zero-stale water purification pipeline system, comprising an N-stage primary filtration system connected to a raw water flow, wherein a water outlet of the N-stage primary filtration system is connected to a first solenoid valve of a first reverse osmosis filtration subsystem via a first branch pipeline on the one hand, and is connected to a second solenoid valve of a second reverse osmosis filtration subsystem via a second branch pipeline on the other hand;

[0014] The first reverse osmosis filtration subsystem includes a first reverse osmosis RO membrane, a raw water port of the first reverse osmosis RO membrane is connected to the water outlet of the first solenoid valve via a first booster pump, a pure water port of the first reverse osmosis RO membrane is connected to the pure water output subsystem, and a concentrated water port of the first reverse osmosis RO membrane is connected to the first wastewater component;

[0015] The second reverse osmosis filtration subsystem includes a second reverse osmosis RO membrane, the raw water port of the second reverse osmosis RO membrane is connected to the water outlet of the second solenoid valve via a second booster pump; the pure water port of the second reverse osmosis RO membrane is connected to the pure water output subsystem via a second pure water output pipeline equipped with a parallel solenoid valve, and is connected to the h1 node located between the first booster pump and the first solenoid valve via a series pipeline equipped with a series solenoid valve; the concentrated water port of the second reverse osmosis RO membrane is connected to the second wastewater component;

[0016] The pure water outlet of the first reverse osmosis RO membrane is also connected to the h2 node located between the second booster pump and the second solenoid valve through a reflux loop.

[0017] Preferably, the reflux circuit comprises a reflux pipeline, on which a reflux solenoid valve and a reflux check valve for preventing reverse flow of water are installed.

[0018] Preferably, the first pure water output pipeline of the first reverse osmosis RO membrane is provided with a first check valve to prevent water from flowing in reverse; the series pipeline is provided with a series check valve to prevent water from flowing in reverse; the second pure water output pipeline is provided with a parallel check valve to prevent water from flowing in reverse.

[0019] Preferably, the pure water output subsystem comprises a pure water pipeline connected to the user-end valve, and a pure water high-pressure switch, a pure water check valve and a pure water TDS sensor for detecting the pure water quality are installed on the pure water pipeline;

[0020] The water inlet end of the N-stage primary filtration system is equipped with a water inlet low-pressure switch, and the water outlet end is equipped with a raw water TDS sensor for detecting the quality of the inlet water.

[0021] Preferably, the first wastewater component and the second wastewater component have the same structure, including two wastewater flow valves and wastewater solenoid valves connected in parallel, the water inlet ends of the wastewater flow valve and the wastewater solenoid valve are connected to the concentrate outlet of the reverse osmosis RO membrane, and the water outlet ends of the wastewater flow valve and the wastewater solenoid valve are connected to the wastewater discharge channel via a wastewater check valve.

[0022] A water purifier using the above-mentioned series-parallel intelligent switching double RO membrane zero stale water purification pipeline system.

[0023] Compared with the prior art, the beneficial effects of the utility model are:

[0024] 1. The water purification concept of this utility model is very clever. By intelligently switching the connection relationship between the two RO membranes at different stages, the water output at the initial stage of water production is pure water, truly achieving "zero stale water";

[0025] 2. The utility model is green and environmentally friendly, and the pure water used to flush the first reverse osmosis filtration subsystem can be recycled, which significantly saves water resources and has a high water resource utilization rate;

[0026] 3. When the water purification system of the utility model is in standby mode, the first reverse osmosis RO membrane of the first reverse osmosis filtration subsystem contains pure water, and the second reverse osmosis RO membrane of the second reverse osmosis filtration subsystem contains diluted old water, which greatly reduces the risk of contamination of the two RO membranes and effectively prolongs the service life of the reverse osmosis RO membranes, thereby effectively reducing the replacement frequency and maintenance cost of the RO membranes;

[0027] 4. In the water production process of the utility model, two RO membranes jointly produce water, and the pure water output flow is surging; even in the series reflux stage, the initial water production flow is large enough; once the system is started, it can obtain pure water with large flow and high water quality, and the user experience is very high;

[0028] 5. The utility model can realize intelligent switching by using conventional simple control circuits, the system design is simple and easy to implement, and the operation is stable and reliable;

[0029] 6. This utility model has important guiding significance in the field of water purifier technology, has strong competitiveness and broad market application prospects; it not only promotes the overall development of the water purifier industry, but also provides powerful guidance for the future trends and technological progress of the industry. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic diagram of the reverse osmosis RO membrane structure.

[0031] Figure 2 This is a schematic diagram of the structure of the pipeline system of the utility model Figure 1 .

[0032] Figure 3 This is a schematic diagram of the structure of the pipeline system of the utility model Figure 2 .

[0033] Figure 4 It is a schematic diagram of the structure of the pipeline system when the utility model is in the series reflux stage.

[0034] Figure 5 It is a schematic structural diagram of one embodiment of the pipeline system when the utility model is in the series operation stage.

[0035] Figure 6 It is a structural schematic diagram of another embodiment of the pipeline system when the utility model is in the series operation stage.

[0036] Figure 7 It is a schematic diagram of the piping system structure when the utility model is in the parallel operation stage.

[0037] Figure 8 It is a schematic diagram of the structure of the pipeline system when the utility model performs the flushing action.

[0038] In the figure: 1. first reverse osmosis filtration subsystem; 11. first reverse osmosis RO membrane; 12. first solenoid valve; 13. first booster pump; 14. first branch pipeline; 15. first wastewater component; 151. wastewater flow valve; 152. wastewater solenoid valve; 153. wastewater check valve; 16. first pure water output pipeline; 17. first check valve; 2. second reverse osmosis filtration subsystem; 21. second reverse osmosis RO membrane; 22. second solenoid valve; 23. second booster pump; 24. second branch pipeline; 25. second wastewater component; 26. second pure water output pipeline; 261. parallel solenoid valve; 262. parallel check valve valve; 28, series pipeline; 281, series solenoid valve; 282, series check valve; 41, N-level primary filtration system; 411, composite filter element; 412, sintered activated carbon filter element; 413, ultrafiltration membrane filter element; 42, water inlet low pressure switch; 43, raw water TDS sensor; 5, pure water output subsystem; 51, pure water pipeline; 52, pure water high pressure switch; 53, pure water check valve; 54, pure water TDS sensor; 55, user-end valve; 6, reflux loop; 61, reflux pipeline; 62, reflux solenoid valve; 63, reflux check valve; 71, membrane shell; 72, pure water; 73, waste water; 74, raw water. DETAILED DESCRIPTION

[0039] In order to enable readers to better understand the design purpose of the utility model, the technical solution described in the utility model is further described in combination with the embodiments below. It should be noted that the directional nouns that may be involved in the following paragraphs, including but not limited to "up, down, left, right, front, back", etc., are based on the visual directions shown in the corresponding drawings of the specification, and they should not be and should not be regarded as limiting the protection scope or technical solution of the utility model. The purpose is only to facilitate technicians in this field to better understand the technical solution created by the utility model.

[0040] In the description of this specification, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0041] Example 1

[0042] like Figures 2 to 3 As shown, this embodiment provides a series-parallel intelligent switching double RO membrane zero-stale water purification pipeline system, including an N-stage primary filtration system 41 connected to the raw water flow, the water outlet of the N-stage primary filtration system 41 is connected to the first solenoid valve 12 of the first reverse osmosis filtration subsystem 1 through the first branch pipeline 14 on the one hand; and is connected to the second solenoid valve 22 of the second reverse osmosis filtration subsystem 2 through the second branch pipeline 24 on the other hand; the first reverse osmosis filtration subsystem 1 includes a first reverse osmosis RO membrane 11, the raw water port of the first reverse osmosis RO membrane 11 is connected to the water outlet of the first solenoid valve 12 through the first booster pump 13, the pure water port of the first reverse osmosis RO membrane 11 is connected to the pure water output subsystem 5, and the concentrated water port of the first reverse osmosis RO membrane 11 is connected to the first wastewater group The second reverse osmosis filtration subsystem 2 includes a second reverse osmosis RO membrane 21, and the raw water port of the second reverse osmosis RO membrane 21 is connected to the water outlet of the second solenoid valve 22 via the second boosting pump 23; the pure water port of the second reverse osmosis RO membrane 21 is connected to the pure water output subsystem 5 through the second pure water output pipeline 26 installed with a parallel solenoid valve 261, and is connected to the h1 node between the first boosting pump 13 and the first solenoid valve 12 through the series pipeline 28 installed with a series solenoid valve 281; the concentrated water port of the second reverse osmosis RO membrane 21 is connected to the second wastewater component 25; the pure water port of the first reverse osmosis RO membrane 11 is also connected to the h2 node between the second boosting pump 23 and the second solenoid valve 22 via the reflux loop 6.

[0043] The working principle of this embodiment is: when the valve is closed at the user end, the water purification system continues the series reflux stage for N1 seconds. After the series reflux stage ends, the water purification system enters the standby state; the series reflux stage refers to the first reverse osmosis filtration subsystem 1 and the second reverse osmosis filtration subsystem 2 being connected in series, and no raw water enters the raw water inlet of the first reverse osmosis filtration subsystem 1, and the pure water purified by the second reverse osmosis filtration subsystem 2 is circulated to the raw water inlet of the first reverse osmosis filtration subsystem 1, and the pure water purified by the first reverse osmosis filtration subsystem 1 is circulated to the raw water inlet of the second reverse osmosis filtration subsystem 2 through the reflux loop 6.

[0044] When the valve is opened at the user end, the water purification system continues the series operation stage for N2 seconds. After the series operation stage ends, the water purification system switches to the parallel operation stage;

[0045] The series operation stage means that the first reverse osmosis filtration subsystem 1 and the second reverse osmosis filtration subsystem 2 are connected in series, the pure water purified by the second reverse osmosis filtration subsystem 2 flows to the raw water inlet of the first reverse osmosis filtration subsystem 1, the reflux loop 6 is closed, and the pure water purified by the first reverse osmosis filtration subsystem 1 flows to the user end; the water flowing into the raw water inlet of the first reverse osmosis filtration subsystem 1 is completely the water flowing out of the pure water inlet of the second reverse osmosis filtration subsystem 2; or, the water flowing into the raw water inlet of the first reverse osmosis filtration subsystem 1 is a mixture of water flowing out of the pure water inlet of the second reverse osmosis filtration subsystem 2 and raw water;

[0046] The parallel operation stage refers to the first reverse osmosis filtration subsystem 1 and the second reverse osmosis filtration subsystem 2 operating independently in parallel, the purified water purified by the first reverse osmosis filtration subsystem 1 flows to the user end, and the purified water purified by the second reverse osmosis filtration subsystem 2 also flows directly to the user end. The user end generally refers to the user's faucet.

[0047] In this embodiment, the first reverse osmosis RO membrane 11 and the second reverse osmosis RO membrane 21 use the same type of RO membrane, generally a 600G large-capacity RO membrane, which has a large flow rate and a unified type, and is easy to maintain and purchase.

[0048] The specific values ​​of N1 and N2 are related to many factors such as the quality of raw water and the size of the reverse osmosis RO membrane. They can be debugged and set according to the actual scenario. Assume that the values ​​of N1 and N2 are both 30 seconds. In the series reflux stage and the series operation stage, the first reverse osmosis filtration subsystem 1 and the second reverse osmosis filtration subsystem 2 are in a series relationship; in the parallel operation stage, the first reverse osmosis filtration subsystem 1 and the second reverse osmosis filtration subsystem 2 are in a parallel relationship. The intelligent switching of the series reflux stage, the series operation stage, the parallel operation stage, and the standby state can be achieved using the existing control circuit. The following is a detailed introduction to each stage of this embodiment in conjunction with the accompanying drawings. The dotted patterns and solid patterns filled in the accompanying drawings represent pure water, the slash patterns represent wastewater, and the mesh patterns represent raw water.

[0049] like Figure 4 As shown, in the series reflux stage, the purified pure water from the second reverse osmosis filtration subsystem 2 flows to the raw water inlet of the first reverse osmosis filtration subsystem 1. At this time, there is no raw water entering the raw water inlet of the first reverse osmosis filtration subsystem 1, and only the pure water from the second reverse osmosis filtration subsystem 2. After the pure water enters the first reverse osmosis filtration subsystem 1, at the beginning, there will be raw water and waste water remaining inside the first reverse osmosis RO membrane 11 in the first reverse osmosis filtration subsystem 1. The first reverse osmosis RO membrane 11 works to purify the mixed water into pure water, which flows back to the raw water inlet of the second reverse osmosis filtration subsystem 2 through the reflux loop 6. After the reflux loop 6 is in operation, the raw water inlet entering the second reverse osmosis filtration subsystem 2 is a mixture of refluxed pure water and raw water. Within 30 seconds of operation, the second reverse osmosis filtration subsystem 2 continuously inputs pure water to the first reverse osmosis filtration subsystem 1. The first reverse osmosis RO membrane 11 is already completely pure water. The raw water and wastewater in the first reverse osmosis RO membrane 11 have been completely replaced. There is no osmotic difference in the first reverse osmosis RO membrane 11. When the water is produced next time, there will be no stale water in the initial water output of the first reverse osmosis RO membrane 11. The design of the reflux loop 6 not only serves the purpose of saving water, but also slows down the generation time of stale water in the second reverse osmosis RO membrane 21 of the second reverse osmosis filtration subsystem 2, and prolongs the service life of the second reverse osmosis RO membrane 21. After the series reflux stage runs for 30 seconds, all electrical equipment is turned off and the water purification system is in standby mode. If the water purification system is started again within 30 seconds, it will directly enter the parallel operation stage.

[0050] like Figure 5-Figure 6 As shown, when the valve is opened at the user end, the water purification system will continue the series operation stage for 30 seconds. The series operation stage means that the reflux loop 6 is closed, the first reverse osmosis filtration subsystem 1 and the second reverse osmosis filtration subsystem 2 are connected in series, the pure water purified by the second reverse osmosis filtration subsystem 2 flows to the raw water outlet of the first reverse osmosis filtration subsystem 1, and the pure water purified by the first reverse osmosis filtration subsystem 1 flows to the user end valve 55. Since the first reverse osmosis RO membrane 11 has been completely replaced with pure water in the series reflux stage, there is no osmotic difference, so the initial water output of the first reverse osmosis RO membrane 11 is pure water, and there is no stale water. The water flowing out of the pure water outlet of the second reverse osmosis RO membrane 21 is stale water, but the stale water of the second reverse osmosis RO membrane 21 will be purified into pure water through the action of the first reverse osmosis RO membrane 11, so the stale water of the second reverse osmosis RO membrane 21 has no effect on the entire water purification system. Since the first reverse osmosis RO membrane 11 purifies the water flowing in from its raw water inlet, the water flowing in from the raw water inlet of the first reverse osmosis RO membrane 11 can be completely water flowing out from the pure water inlet of the second reverse osmosis RO membrane 21 (such as Figure 5 as shown); or Figure 6As shown, the water flow entering from the raw water inlet of the first reverse osmosis filtration subsystem 1 is a mixture of the water flowing out of the pure water inlet of the second reverse osmosis filtration subsystem 2 and the raw water. Figure 6 The illustrated embodiment has a larger initial water flow rate of the water purification system and is a preferred embodiment.

[0051] like Figure 7 As shown, after the series operation stage ends, the water purification system will switch to the parallel operation stage, because after the series operation stage, the second reverse osmosis RO membrane 21 has no stale water and can work normally and independently. The parallel operation stage refers to the first reverse osmosis filtration subsystem 1 and the second reverse osmosis filtration subsystem 2 operating independently in parallel, and the pure water purified by the first reverse osmosis filtration subsystem 1 flows to the user end, and the pure water purified by the second reverse osmosis filtration subsystem 2 also flows directly to the user end. At this time, it is the normal water use stage for users, and the two reverse osmosis RO membranes discharge water at the same time, and the water discharge is surging.

[0052] The water purification concept of this embodiment is very clever. By intelligently switching the connection relationship between the two RO membranes at different stages, the water output at the initial stage of water production is pure water, truly achieving "zero stale water";

[0053] This embodiment is green and environmentally friendly, and the pure water used to flush the first reverse osmosis filtration subsystem can be recycled, which significantly saves water resources and has a high water resource utilization rate;

[0054] When the water purification system of this embodiment is on standby, the first reverse osmosis RO membrane of the first reverse osmosis filtration subsystem contains pure water, and the second reverse osmosis RO membrane of the second reverse osmosis filtration subsystem contains diluted old water, which greatly reduces the contamination risk of the two RO membranes and effectively extends the service life of the reverse osmosis RO membranes, thereby effectively reducing the replacement frequency and maintenance cost of the RO membranes.

[0055] In the water production process of this embodiment, two RO membranes jointly produce water, and the pure water output flow rate is surging; even in the series reflux stage, the initial water production flow rate is large enough, and the system can obtain high-flow, high-quality pure water as soon as it is started, and the user experience is very high;

[0056] This embodiment can realize intelligent switching by using a conventional simple control circuit, the system design is simple and easy to implement, and the operation is stable and reliable;

[0057] This embodiment has important guiding significance in the field of water purifier technology, has strong competitiveness, and has broad market application prospects; it not only promotes the overall development of the water purifier industry, but also provides powerful guidance for the future trends and technological progress of the industry.

[0058] Example 2

[0059] Based on Example 1, this example continues to describe in detail the technical features involved therein and the functions and roles played by the technical features in the utility model, so as to help technicians in this field fully understand the technical solution of the utility model and reproduce it.

[0060] like Figures 2 to 8 As shown, the series-parallel intelligent switching dual RO membrane zero-stale water purification pipeline system of this embodiment includes an N-level primary filtration system 41 connected to the raw water flow, and the N-level primary filtration system 41 is a three-level filtration system, which includes a composite filter element 411, a sintered activated carbon filter element 412, and an ultrafiltration membrane filter element 413. The water outlet of the N-level primary filtration system 41 is connected to the first solenoid valve 12 of the first reverse osmosis filtration subsystem 1 through the first branch pipeline 14 on the one hand; and is connected to the second solenoid valve 22 of the second reverse osmosis filtration subsystem 2 through the second branch pipeline 24 on the other hand;

[0061] The first reverse osmosis filtration subsystem 1 includes a first reverse osmosis RO membrane 11, a raw water port of the first reverse osmosis RO membrane 11 is connected to a water outlet of a first solenoid valve 12 via a first booster pump 13, a pure water port of the first reverse osmosis RO membrane 11 is connected to a pure water output subsystem 5, and a concentrated water port of the first reverse osmosis RO membrane 11 is connected to a first wastewater assembly 15;

[0062] The second reverse osmosis filtration subsystem 2 includes a second reverse osmosis RO membrane 21, and the raw water port of the second reverse osmosis RO membrane 21 is connected to the water outlet of the second electromagnetic valve 22 via the second booster pump 23; the pure water port of the second reverse osmosis RO membrane 21 is connected to the pure water output subsystem 5 via the second pure water output pipeline 26 installed with a parallel electromagnetic valve 261, and is connected to the h1 node located between the first booster pump 13 and the first electromagnetic valve 12 via the series pipeline 28 installed with a series electromagnetic valve 281; the concentrated water port of the second reverse osmosis RO membrane 21 is connected to the second wastewater component 25;

[0063] The pure water outlet of the first reverse osmosis RO membrane 11 is also connected to the h2 node between the second booster pump 23 and the second solenoid valve 22 through the reflux loop 6. The reflux loop 6 includes a reflux pipeline 61, on which a reflux solenoid valve 62 and a reflux check valve 63 for preventing water from flowing in reverse are installed.

[0064] In this embodiment, the first pure water output pipeline 16 of the first reverse osmosis RO membrane 11 is provided with a first check valve 17 to prevent the reverse flow of water; the series pipeline 28 is provided with a series check valve 282 to prevent the reverse flow of water; the second pure water output pipeline 26 is provided with a parallel check valve 262 to prevent the reverse flow of water. The pure water output subsystem 5 includes a pure water pipeline 51 connected to the user-end valve 55, and the pure water pipeline 51 is installed with a pure water high pressure switch 52, a pure water check valve 53 and a pure water TDS sensor 54 for detecting the pure water quality; the water inlet end of the N-level primary filtration system 41 is installed with a water inlet low pressure switch 42, and the water outlet end thereof is installed with a raw water TDS sensor 43 for detecting the water quality of the inlet water.

[0065] The first wastewater assembly 15 and the second wastewater assembly 25 of this embodiment have the same structure, including two wastewater flow valves 151 and wastewater solenoid valves 152 connected in parallel, the water inlet ends of the wastewater flow valves 151 and the wastewater solenoid valves 152 are connected to the concentrate outlet of the reverse osmosis RO membrane, and the water outlet ends of the wastewater flow valves 151 and the wastewater solenoid valves 152 are connected to the wastewater discharge channel via the wastewater check valve 153.

[0066] The working principle of this embodiment is: when the pure water high pressure switch 52 is closed, it means that the user has stopped using water, that is, the user-side valve 55 has been closed. Figure 4As shown, at this time, the first solenoid valve 12 is closed, the second solenoid valve 22 is opened, the parallel solenoid valve 261 is closed, the series solenoid valve 281 is opened, the first booster pump 13 is opened, and the second booster pump 23 is opened. The water inlet low pressure switch 42 is used to detect the water source pressure. The closure of the water inlet low pressure switch 42 indicates that the water source pressure is normal. The source raw water enters the second reverse osmosis RO membrane 21 through the water inlet low pressure switch 42, the N-level primary filtration system 41, the raw water TDS sensor 43, the second branch pipeline 24, the second solenoid valve 22, and the second booster pump 23. The design of the backflow check valve 63 prevents the raw water from flowing in the backflow loop 6. After purification by the second reverse osmosis RO membrane 21, the pure water flowing out from the pure water outlet of the second reverse osmosis RO membrane 21 flows to the node h1 through the series pipeline 28 provided with a series solenoid valve 281 and a series check valve 282, and then the pure water enters the first reverse osmosis RO membrane 11 through the first booster pump 13, and the pure water flowing out from the pure water outlet of the first reverse osmosis RO membrane 11 flows into the reflux loop 6 through the first pure water output pipeline 16 provided with a first check valve 17 and the pure water TDS sensor 54, and the pure water flowing out of the reflux loop 6 flows to the node h2, the h2 node is a mixture of pure water and raw water, and the mixed water flows to the raw water outlet of the second reverse osmosis RO membrane 21 through the second booster pump 23, and then is purified by the second reverse osmosis RO membrane 21 to obtain pure water flowing to the first reverse osmosis RO membrane 11; the waste water of the first reverse osmosis RO membrane 11 is discharged through the first wastewater component 15. In this way, a circulation loop of the series reflux stage is formed. After a few seconds, the residual raw water and waste water in the first reverse osmosis RO membrane 11 will be completely replaced by pure water, and the first pure water output pipeline 16, the first booster pump 13, and the series pipeline 28 are all pure water. There is no osmotic difference in the first reverse osmosis RO membrane 11, and there is no problem of stale water in the next water production. The series reflux stage design of this embodiment not only makes the first reverse osmosis RO membrane 11 have no osmotic difference, but also the reflux design of the reflux loop 6 dilutes the TDS value in the second reverse osmosis RO membrane 21 while saving water resources, slowing down the stale water generation time of the second reverse osmosis RO membrane 21, and extending the service life of the second reverse osmosis RO membrane 21.

[0067] After the series reflux phase runs for N1 seconds, all electrical equipment is turned off and the water purification system is in standby mode. If the water purification system is started again within N1 seconds, it directly enters the parallel operation phase. Because the time is too short, neither the first reverse osmosis RO membrane 11 nor the second reverse osmosis RO membrane 21 has generated stale water inside.

[0068] When the pure water high pressure switch 52 is disconnected, it means that the user has started to use water, that is, the user-side valve 55 has been opened, and the water purification system enters the series operation stage lasting N2 seconds. Since the first reverse osmosis RO membrane 11 purifies the water flow entering from its raw water inlet, the water flow entering from the raw water inlet of the first reverse osmosis RO membrane 11 can be completely water flowing out of the pure water inlet of the second reverse osmosis RO membrane 21 (such as Figure 5 Or, the water flowing into the raw water inlet of the first reverse osmosis filtration subsystem 1 is a mixture of the water flowing out of the pure water inlet of the second reverse osmosis filtration subsystem 2 and the raw water (such as Figure 6 as shown).

[0069] The first implementation of the series operation phase is as follows Figure 5 As shown, the first solenoid valve 12 is closed, the second solenoid valve 22 is opened, the parallel solenoid valve 261 is closed, the series solenoid valve 281 is opened, the reflux solenoid valve 62 is closed, the first booster pump 13 is opened, and the second booster pump 23 is opened. The raw water (such as tap water) of the water source is initially filtered through the N-stage primary filtration system 41 and then flows to the second branch pipeline 24 through the raw water TDS sensor 43. The raw water in the second branch pipeline 24 enters the second reverse osmosis RO membrane 21 through the second booster pump 23. There is stale water in the second reverse osmosis RO membrane 21, so the initial output water of the second reverse osmosis RO membrane 21 is stale water. The stale water of the second reverse osmosis RO membrane 21 flows to the first reverse osmosis RO membrane 11 through the series pipeline 28 provided with the series solenoid valve 281 and the series check valve 282, and the first booster pump 13. The first reverse osmosis RO membrane 11 purifies the stale water into pure water, and flows out from the pure water port of the first reverse osmosis RO membrane 11. Since there is no residual raw water and waste water in the first reverse osmosis RO membrane 11 during the series reflux stage, there is no stale water problem in the first reverse osmosis RO membrane 11. The pure water flowing out of the first reverse osmosis RO membrane 11 flows out from the user-end valve 55 through the first pure water output pipeline 16 provided with a first check valve 17 and the pure water pipeline 51 provided with a pure water TDS sensor 54, a pure water check valve 53, and a pure water high-pressure switch 52 for use by the user.

[0070] The second implementation of the series operation phase is as follows Figure 6 shown. Figure 6 and Figure 5 The water flow circuit is basically the same, but Figure 6 The first solenoid valve 12 is set to open. At this time, the water source raw water (such as tap water) is initially filtered through the N-level primary filtration system 41 and then flows through the raw water TDS sensor 43 to the first branch pipeline 14 and the second branch pipeline 24. That is, the water flowing to the raw water outlet of the first reverse osmosis RO membrane 11 includes not only the water flowing out of the pure water outlet of the second reverse osmosis RO membrane 21, but also the tap water. The mixed water of the two can also obtain pure water after being purified by the first reverse osmosis RO membrane 11. Figure 6 The water flow ratio of the piping circuit shown Figure 5 The illustrated pipeline loop has a larger water output. After N2 seconds of operation in the series operation stage, there is no stale water in the second reverse osmosis RO membrane 21, and it can be operated independently, and then enters the parallel operation stage.

[0071] like Figure 7As shown, the parallel operation stage refers to the first reverse osmosis filtration subsystem 1 and the second reverse osmosis filtration subsystem 2 operating independently in parallel. The first solenoid valve 12 is turned on, the second solenoid valve 22 is turned on, the first booster pump 13 is turned on, the second booster pump 23 is turned on, the series solenoid valve 281 is closed, and the parallel solenoid valve 261 is turned on. At this time, there are two pure water production circuits. The first route is: the raw water flowing out of the first branch pipeline 14 enters the first reverse osmosis RO membrane 11 through the first booster pump 13, the waste water of the first reverse osmosis RO membrane 11 is discharged through the first wastewater component 15, and the pure water of the first reverse osmosis RO membrane 11 flows out from the user-end valve 55 through the first check valve 17, the pure water TDS sensor 54, the pure water check valve 53, and the pure water high-pressure switch 52. The second route is: the raw water flowing out of the second branch pipeline 24 enters the second reverse osmosis RO membrane 21 through the second booster pump 23, the waste water of the second reverse osmosis RO membrane 21 is discharged through the second wastewater assembly 25, and the pure water of the second reverse osmosis RO membrane 21 flows out from the user-end valve 55 through the parallel solenoid valve 261, the parallel check valve 262, the pure water TDS sensor 54, the pure water check valve 53, and the pure water high-pressure switch 52. At this time, it is the normal water use stage of the user, and the two reverse osmosis RO membranes simultaneously output water, with a large flow rate and surging water output.

[0072] This embodiment also has a flushing function, which is to adjust the opening of the wastewater valve to the maximum, discharge more water to remove the sediment on the RO membrane. Flushing has a positive effect on increasing the life of the reverse osmosis RO membrane. The flushing function of this embodiment is specifically performed during the parallel operation stage.

[0073] The raw water TDS sensor 43 is used to detect the quality of raw water. The worse the raw water quality is, the shorter the water production time is, the more flushing is required; the worse the raw water quality is, the longer the flushing time is; this is to protect the service life of the reverse osmosis RO membrane. The wastewater flow valve 151 and the wastewater solenoid valve 152 are connected in parallel to form a wastewater valve. When the first wastewater component 15 and the second wastewater component 25 are in normal water production, the wastewater solenoid valve 152 is closed, and the wastewater is discharged through the wastewater flow valve 151 and the wastewater check valve 153. Figure 8 As shown, when the flushing action is performed, the wastewater flow valve 151 and the wastewater solenoid valve 152 are opened at the same time, the amount of wastewater is large, and the wastewater flows out from the wastewater flow valve 151 and the wastewater solenoid valve 152 at the same time, and is discharged through the wastewater check valve 153.

[0074] The water purification concept of this embodiment is very clever. By intelligently switching the connection relationship between the two RO membranes at different stages, the water output at the initial stage of water production is pure water, truly achieving "zero stale water";

[0075] This embodiment is green and environmentally friendly, and the pure water used to flush the first reverse osmosis filtration subsystem can be recycled, which significantly saves water resources and has a high water resource utilization rate;

[0076] When the water purification system of this embodiment is on standby, the first reverse osmosis RO membrane of the first reverse osmosis filtration subsystem contains pure water, and the second reverse osmosis RO membrane of the second reverse osmosis filtration subsystem contains diluted old water, which greatly reduces the contamination risk of the two RO membranes and effectively extends the service life of the reverse osmosis RO membranes, thereby effectively reducing the replacement frequency and maintenance cost of the RO membranes.

[0077] In the water production process of this embodiment, two RO membranes jointly produce water, and the pure water output flow rate is surging; even in the series reflux stage, the initial water production flow rate is large enough, and the system can obtain high-flow, high-quality pure water as soon as it is started, and the user experience is very high;

[0078] This embodiment can realize intelligent switching by using a conventional simple control circuit, the system design is simple and easy to implement, and the operation is stable and reliable;

[0079] This embodiment has important guiding significance in the field of water purifier technology, has strong competitiveness, and has broad market application prospects; it not only promotes the overall development of the water purifier industry, but also provides powerful guidance for the future trends and technological progress of the industry.

[0080] Example 3

[0081] This embodiment provides a water purifier, which applies the series-parallel intelligent switching double RO membrane zero-stale water purification pipeline system described in Embodiments 1 and 2.

[0082] In summary, the above are only preferred embodiments of the present invention and are not intended to limit the scope of implementation of the present invention. All equivalent changes and modifications in shape, structure, features and spirit within the scope of the claims of the present invention should be included within the scope of the claims of the present invention.

Claims

1. A series-parallel intelligent switching double RO membrane zero-stale water purification pipeline system, comprising an N-stage primary filtration system (41) connected to the raw water flow, characterized in that: The water outlet of the N-stage primary filtration system (41) is connected to the first solenoid valve (12) of the first reverse osmosis filtration subsystem (1) via a first branch pipeline (14) on the one hand; and is connected to the second solenoid valve (22) of the second reverse osmosis filtration subsystem (2) via a second branch pipeline (24) on the other hand; The first reverse osmosis filtration subsystem (1) comprises a first reverse osmosis RO membrane (11), the raw water outlet of the first reverse osmosis RO membrane (11) being connected to the water outlet of the first solenoid valve (12) via a first booster pump (13), the pure water outlet of the first reverse osmosis RO membrane (11) being connected to the pure water output subsystem (5), and the concentrated water outlet of the first reverse osmosis RO membrane (11) being connected to the first wastewater assembly (15); The second reverse osmosis filtration subsystem (2) comprises a second reverse osmosis RO membrane (21); the raw water outlet of the second reverse osmosis RO membrane (21) is connected to the water outlet of the second solenoid valve (22) via a second booster pump (23); the pure water outlet of the second reverse osmosis RO membrane (21) is connected to the pure water output subsystem (5) via a second pure water output pipeline (26) equipped with a parallel solenoid valve (261), and is connected to the h1 node located between the first booster pump (13) and the first solenoid valve (12) via a series pipeline (28) equipped with a series solenoid valve (281); the concentrated water outlet of the second reverse osmosis RO membrane (21) is connected to the second wastewater assembly (25); The pure water outlet of the first reverse osmosis RO membrane (11) is also connected to the h2 node located between the second booster pump (23) and the second solenoid valve (22) via the reflux loop (6).

2. The series-parallel intelligent switching double RO membrane zero-stale water purification pipeline system according to claim 1 is characterized by: The reflux circuit (6) comprises a reflux pipeline (61), on which a reflux solenoid valve (62) and a reflux check valve (63) for preventing reverse flow of water are installed.

3. The series-parallel intelligent switching double RO membrane zero-stale water purification pipeline system according to claim 1 is characterized by: The first pure water output pipeline (16) of the first reverse osmosis RO membrane (11) is provided with a first check valve (17) for preventing water from flowing in reverse; the series pipeline (28) is provided with a series check valve (282) for preventing water from flowing in reverse; and the second pure water output pipeline (26) is provided with a parallel check valve (262) for preventing water from flowing in reverse.

4. The series-parallel intelligent switching double RO membrane zero-stale water purification pipeline system according to claim 1 is characterized by: The pure water output subsystem (5) comprises a pure water pipeline (51) connected to a user-end valve (55), and a pure water high-pressure switch (52), a pure water check valve (53), and a pure water TDS sensor (54) for detecting the quality of pure water are installed on the pure water pipeline (51); The water inlet end of the N-stage primary filtration system (41) is provided with a water inlet low-pressure switch (42), and the water outlet end is provided with a raw water TDS sensor (43) for detecting the quality of the inlet water.

5. The series-parallel intelligent switching double RO membrane zero-stale water purification pipeline system according to claim 1 is characterized by: The first wastewater assembly (15) and the second wastewater assembly (25) have the same structure, comprising two wastewater flow valves (151) and wastewater solenoid valves (152) connected in parallel, wherein the water inlet ends of the wastewater flow valves (151) and the wastewater solenoid valves (152) are connected to the concentrated water outlet of the reverse osmosis (RO) membrane, and the water outlet ends of the wastewater flow valves (151) and the wastewater solenoid valves (152) are connected to the wastewater discharge channel via the wastewater check valve (153).

6. A water purifier using the series-parallel intelligent switching double RO membrane zero-stale water purification pipeline system described in any one of claims 1 to 5.

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