Water purification system

Abstract

The invention discloses a water purification system, which comprises a reverse osmosis filter assembly, the reverse osmosis filter assembly comprises a filter container with a raw water port, a pure water port and a concentrated water port, and a raw water passage, a pure water passage and a concentrated water passage are formed in the filter container; the raw water channel is provided with a reverse osmosis filter element; the volume of the pure water passage can be changed and is positively correlated with the water pressure of pure water in the pure water passage; the raw water pipe is provided with a raw water inlet valve and a booster pump and is used for inputting raw water into the raw water port; the concentrated water pipe is provided with a concentrated water outlet valve and is used for discharging concentrated water output from the concentrated water port; the pure water pipe is provided with a pure water outlet valve and is used for discharging pure water output from the pure water port; when the back-flushing water path is communicated, the pure water output by the pure water passage is allowed to flow back, and flows into the raw water passage through the booster pump to flush the reverse osmosis filter element. The water pressure for washing the reverse osmosis filter element can be improved in a two-stage pressurization mode, the difficulty of replacing concentrated water is reduced, water is saved, and the instantaneous water yield during water taking can be improved.

Description

Technical Field

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

[0003] With the increasing attention paid to drinking water safety, reverse osmosis water purifiers or water purification systems have gradually become an indispensable household appliance. The reverse osmosis filtration component uses the reverse osmosis principle when making water. Under the action of external pressure, water molecules pass through the membrane of the reverse osmosis filter element into the pure water side, and salt ions are retained on the concentrated water side. When standing still, the faucet is closed, resulting in the sealing of the pure water side. The pure water on the pure water side cannot penetrate back to the concentrated water side, while salt ions slowly diffuse to the pure water side, resulting in an increase in the TDS value of the pure water side; when used again, these high TDS pure waters are released, which will affect people's drinking water health.

[0004] At present, in the prior art, the reverse osmosis filtration component usually adopts the method of returning pure water to the reverse osmosis filter element to replace the water containing large particles in the reverse osmosis filter element, that is, the raw water and concentrated water, thereby significantly reducing the TDS value of the first cup of water. However, when the pure water returns, it needs to pass through the multi-layer reverse osmosis membrane of the reverse osmosis filter element. Its large reflux resistance makes it difficult for pure water to replace concentrated water. On the one hand, it not only makes it difficult for pure water to completely replace concentrated water, but also causes large particles of impurities to remain in the reverse osmosis filter element. On the other hand, this flushing mode requires a large amount of pure water for reflux. Generally, the volume of the reverse osmosis filter element is about 800mL, and it takes about 2L of pure water to basically replace the concentrated water in the reverse osmosis filter element, resulting in a waste of water resources; in addition, the user usually has a small amount of water when taking water, which makes the user experience poor. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a water purification system which can increase the water pressure for flushing the reverse osmosis filter element by a two-stage pressurization method, reduce the difficulty of replacing concentrated water, save water, and increase the instantaneous water output when taking water.

[0006] In order to achieve the above objectives, the following technical solutions are provided: In a first aspect, the present invention provides a water purification system, comprising: A reverse osmosis filtration component, comprising a filtration container having a raw water inlet, a pure water inlet and a concentrated water inlet, wherein a raw water passage connected to the raw water inlet, a pure water passage connected to the pure water inlet and a concentrated water passage connected to the concentrated water inlet are formed in the filtration container; the raw water passage is provided with a reverse osmosis filter element, so that raw water in the reverse osmosis filter element generates pure water entering the pure water passage through a reverse osmosis flow direction, and generates concentrated water entering the concentrated water passage through a raw water passage flow direction; the volume of the pure water passage is variable and is positively correlated with the pure water pressure in the pure water passage; A raw water pipe, which is provided with a raw water inlet valve and a booster pump, and is used to input raw water into the raw water inlet; A concentrated water pipe, which is provided with a concentrated water outlet valve for discharging concentrated water outputted from the concentrated water outlet; A pure water pipe, which is provided with a pure water outlet valve for discharging the pure water output from the pure water outlet; A backwash water circuit connects the pure water passage and the input end of the booster pump and is provided with a backwash water inlet valve; when the backwash water circuit is connected, the pure water output from the pure water passage is allowed to flow back and flow into the raw water passage through the booster pump to flush the reverse osmosis filter element.

[0007] As an optional solution of the water purification system provided by the present invention, the backwash water circuit is provided with a one-way valve which limits the flow from the pure water channel to the booster pump, and the one-way valve is connected in series to the output end of the backwash water inlet pump.

[0008] As an optional solution of the water purification system provided by the present invention, the filter container includes a filter bottle with the reverse osmosis filter element arranged inside, and a filter element seat arranged on the filter bottle; the raw water inlet, the pure water inlet and the concentrated water inlet are all arranged on the filter element seat; the filter element seat is provided with a raw water pipe connected to the raw water inlet and constituting a part of the raw water passage, a pure water pipe connected to the pure water inlet and constituting a part of the pure water passage, and a concentrated water pipe connected to the concentrated water inlet and constituting a part of the concentrated water passage.

[0009] As an optional solution of the water purification system provided by the present invention, a central tube with a water hole is arranged in the filter bottle, the central tube constitutes a part of the pure water passage and is connected to the pure water pipeline; the reverse osmosis filter element is sleeved outside the central tube, the reverse osmosis filter element constitutes a part of the raw water passage and is connected to the raw water pipeline; there is a gap between the reverse osmosis filter element and the inner wall of the filter bottle, the gap constitutes a part of the concentrated water passage and is connected to the concentrated water channel.

[0010] As an optional solution of the water purification system provided by the present invention, a water containing chamber connected to the central tube is provided in the filter bottle, and the volume of the water containing chamber is variable and is positively correlated with the water pressure of the pure water therein.

[0011] As an optional solution of the water purification system provided by the present invention, the water containing chamber is connected to an end of the central tube away from the filter element seat.

[0012] As an optional solution of the water purification system provided by the present invention, an elastic diaphragm is provided in the water containing chamber to divide the space of the water containing chamber into two parts, one part of the space is connected to the central tube, and the other part of the space has a compressible medium, so that the volume of the water containing chamber can be changed and is positively correlated with the pure water pressure.

[0013] As an optional solution of the water purification system provided by the present invention, a partition is provided in the central tube to divide the space of the central tube into two parts, one part of the space is connected to the pure water pipeline, and the other part is not connected to the pure water passage, and the partition is movable and elastically supported, so that the volume of pure water in the central tube can be changed and is positively correlated with the pure water pressure in the central tube.

[0014] As an optional solution of the water purification system provided by the present invention, the space in the central tube which is separated by the partition and is not connected to the pure water passage is provided with an elastic member supporting the partition.

[0015] As an optional solution of the water purification system provided by the present invention, a pre-filter element is used to pre-filter the raw water in the raw water pipe; The post-filter element is used for post-filtration of pure water in the pure water pipe.

[0016] As an optional solution of the water purification system provided by the present invention, the pre-filter element and the post-filter element are combined into a composite filter element.

[0017] Compared with the prior art, the present invention has the following beneficial effects: In the process of preparing pure water, the pure water passage can increase its volume, increase the pure water pressure in the pure water passage, and store the pure water at a pressurized level, so that the instantaneous water outlet pressure can be increased when the pure water is released. The booster pump can be used to increase the pressure so that the pure water can obtain a greater flushing water pressure when the reverse osmosis filter component is refluxed for flushing, thereby enhancing the penetration effect of pure water on the reverse osmosis membrane and improving the flushing efficiency, thereby achieving the purpose of reducing the consumption of pure water. In addition, since the instantaneous water outlet pressure of pure water is increased, it is helpful to obtain a more objective water output when the user normally takes water, thereby improving the user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments of the present invention. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the contents of the embodiments of the present invention and these drawings without paying any creative work.

[0020] Figure 1 is a schematic diagram of the water purification system in Implementation Case 1; Figure 2 is a schematic diagram of a reverse osmosis filtration assembly in implementation case 1; Figure 3 is a schematic diagram of a reverse osmosis filtration assembly provided with a water containing chamber in implementation case 1; Figure 4It is a schematic diagram of a reverse osmosis filtration component provided with a partition in implementation case 1.

[0021] In the figure: 1. Reverse osmosis filter assembly; 11. Filter bottle; 111. Reverse osmosis filter element; 112. Center tube; 113. Water hole; 114. Water storage chamber; 115. Elastic diaphragm; 116. Partition; 117. Elastic member; 12. Filter element seat; 121. Raw water inlet; 122. Pure water inlet; 123. Concentrate water inlet; 124. Raw water passage; 125. Pure water passage; 126. Concentrate water passage; 127. Raw water pipeline; 128. Pure water pipeline; 129. Concentrate water pipeline; 2. Raw water pipeline; 21. Raw water inlet valve; 22. Booster pump; 3. Concentrate water pipe; 31. Concentrate water outlet valve; 4. Pure water pipe; 41. Pure water outlet valve; 5. Backwash water circuit; 51. Pure water inlet valve; 52. One-way valve; 6. Pre-filter element; 7. Post-filter element; 8. Composite filter element. DETAILED DESCRIPTION

[0023] In order to make the technical problems solved by the present invention, the technical solutions adopted and the technical effects achieved clearer, the technical solutions of the embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0024] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance. Among them, the terms "first position" and "second position" are two different positions.

[0025] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0026] A water purification system, reference Figures 1 to 4 , which is the same as the existing reverse osmosis water purification system, includes a reverse osmosis filtration component 1, a raw water pipe 2, a concentrated water pipe 3, and a pure water pipe 4. Among them, the raw water pipe 2 is provided with a raw water inlet valve 21 and a booster pump 22, which are used to input raw water into the reverse osmosis filtration component 1; the concentrated water pipe 3 is provided with a concentrated water outlet valve 31, which is used to discharge the concentrated water output by the reverse osmosis filtration component 1; the pure water pipe 4 is connected to the reverse osmosis filtration component 1 and is provided with a pure water outlet valve 41, which is used to discharge the pure water produced by the reverse osmosis filtration component 1 through reverse osmosis filtration. The pure water pipe 4 can adopt a single-tube structure to realize a pure water output mode of a single temperature, or a double-tube parallel structure, in conjunction with a flow control pump, a heating pipe and other structures, to realize a pure water output mode of different temperatures.

[0027] Reverse osmosis filter assembly 1, reference Figure 1-4 , including a filter container, the filter container has a raw water port 121 connected to the raw water pipe 2, a pure water port 122 connected to the pure water pipe 4, and a concentrated water port 123 connected to the concentrated water pipe 3, and the filter container has a raw water passage 124, a pure water passage 125, and a concentrated water passage 126. Among them, the raw water passage 124 is connected to the raw water port 121, and the raw water is input into the filter container through the raw water port 121, and the raw water flows along the raw water passage 124, the pure water passage 125 is connected to the pure water port 122, the pure water in the filter container flows along the pure water passage 125, and is output from the filter container through the pure water port 122, and the concentrated water passage 126 is connected to the pure water port 122, and the concentrated water in the filter container flows along the concentrated water passage 126, and is output from the filter container through the concentrated water port 123.

[0028] The raw water passage 124 is provided with a reverse osmosis filter element 111, which is also called an RO reverse osmosis water purifier filter element. It utilizes the principle of reverse osmosis technology. When water passes through a reverse osmosis membrane under a certain pressure, water molecules can pass through, while most soluble solids, inorganic salts, organic matter, colloids, bacteria, viruses and other larger molecules and particles cannot pass through, are blocked and discharged with concentrated water, so the reverse osmosis filter element 111 can filter the raw water to form pure water and concentrated water respectively. In this embodiment, the raw water flows through the reverse osmosis filter element 111 through reverse osmosis to generate pure water entering the pure water passage 125, and flows through the raw water passage 124 to generate concentrated water entering the concentrated water passage 126. In the filter container, the pure water passage 125 and the concentrated water passage 126 are equivalent to being connected in parallel with the raw water passage 124.

[0029] In addition, similar to the existing reverse osmosis water purification system, the water purification system of the present application also adopts a reflux method to replace the water containing large particles in the reverse osmosis filter element 111, thereby reducing the TDS value of the first cup of water. That is, the water purification system includes a backwash water path 5, which can block or connect the pure water path 125 connected to the reverse osmosis filter component 1 and the raw water pipe 2, and the backwash water path 5 is provided with a pure water inlet valve 51, and the blocking or connection of the backwash water path 5 is achieved by opening and closing the pure water inlet valve 51. Specifically, the backwash water channel 5 is directly connected to the input end of the booster pump 22 of the raw water pipe 2. When the backwash water channel 5 is blocked, the pure water flow of the pure water channel 125 and the raw water flow of the raw water pipe 2 do not interfere with each other. When the backwash water channel 5 is connected, the pure water in the pure water channel 125 is allowed to flow into the booster pump 22 of the raw water pipe 2 through the backwash water channel 5, and is transported back to the reverse osmosis filtration component 1 through the booster pump 22 to flush the reverse osmosis filter element 111 of the raw water channel 124. The flushing action can flush and replace the concentrated water in the reverse osmosis filter element 111, so that the reverse osmosis filter element 111 does not contain larger molecules and particles such as solids, inorganic salts, organic matter, colloids, bacteria, viruses, etc., so that the TDS value of the first cup of water when the user takes water is greatly reduced, and the pure water used for flushing and the concentrated water replaced by flushing are discharged outward through the concentrated water pipe 3.

[0030] Before explaining the improvements of the present application, a specific and in-depth analysis is made on the shortcomings of the prior art reflux scheme: the prior art performs backwashing by returning pure water to the reverse osmosis filter element 111. During the cleaning process, the concentrated water pipe 3 is in a connected and open state. Under the pressure-boosting action of the booster pump 22, the returned pure water will penetrate and wash the multi-layer reverse osmosis membrane of the reverse osmosis filter element 111, flushing out the large particles on the multi-layer reverse osmosis membrane. The flushed large particles will be connected to the pure water and discharged outward through the concentrated water pipe 3. However, there is a problem in the flushing process: that is, during the flushing process, although the pure water can be pressurized by the booster pump 22 to flush the reverse osmosis filter element 111, the pure water in the pure water passage 125 does not have pressure initially, so that the water pressure difference of the pure water during backwashing is still insufficient, and the penetration degree of the pure water returning to the reverse osmosis filter element 111 is relatively low, resulting in limited flushing effect. The only way is to consume a large amount of pure water for reverse osmosis flushing or use a higher-power booster pump 22. The former will cause a waste of water resources, and the latter is not conducive to the lightweight production of equipment.

[0031] In this regard, compared with the prior art, the improvement of the present application is that: on the basis of adopting the pure water backflow flushing scheme of the reverse osmosis filter element 111, a two-stage pressurized pure water backflow flushing scheme is adopted by optimizing and improving the reverse osmosis filter assembly 1. Specifically: in this implementation case, the volume of the pure water passage 125 can be changed, and is positively correlated with the pure water pressure in the pure water passage 125, that is, the larger the volume of the pure water passage 125, the greater the pure water pressure in the pure water passage 125. By adopting the above scheme, in the process of preparing pure water, the pure water passage 125 can increase its volume, thereby increasing the water pressure of the pure water in the pure water passage 125, and pressurizing and storing the pure water, so that the instantaneous water outlet pressure can be increased when the pure water is released, and the boosting pump 22 is used to increase the pressure so that the pure water can obtain a greater flushing water pressure when the reverse osmosis filter component 1 is refluxed and flushed, thereby enhancing the penetration effect of pure water on the reverse osmosis membrane and improving the flushing efficiency, thereby achieving the purpose of reducing the consumption of pure water. In addition, since the instantaneous water outlet pressure of pure water is increased, it is helpful to obtain a more objective water output when the user normally takes water, thereby improving the user experience.

[0032] In this embodiment, the backwash water path 5 is provided with a one-way valve 52, which is connected in series to the output end of the pure water outlet valve 41, and the one-way valve 52 limits the flow from the pure water passage 125 to the booster pump 22. By connecting the one-way valve 52 in series to the output end of the pure water outlet valve 41, it is possible to prevent the high-pressure raw water input from the raw water pipe 2 from directly impacting the pure water outlet valve 41 during the process of preparing pure water by the reverse osmosis filtration assembly 1, causing the pure water outlet valve 41 to be damaged and leak, thereby causing the raw water to flow back into the pure water passage 125.

[0033] The specific structural composition and connection method of the reverse osmosis filtration component 1 of the present application are described in detail below: In this embodiment, the filter container of the reverse osmosis filter assembly 1 includes a filter bottle 11 and a filter element seat 12. The filter bottle 11 is a structure with an opening and a hollow interior, the reverse osmosis filter element 111 is arranged in the filter bottle 11, and the filter element seat 12 is installed at the opening of the filter bottle 11, thereby forming a sealed structure with the filter bottle 11. The raw water inlet 121, the pure water inlet 122 and the concentrated water inlet 123 are all arranged on the filter element seat 12. The filter element seat 12 is provided with a raw water pipe 127, a pure water pipe 128 and a concentrated water pipe 129. The raw water pipe 127 is connected to the raw water inlet 121 and constitutes a part of the raw water passage 124, and the other part of the raw water passage 124 is located in the filter bottle 11; the pure water pipe 128 is connected to the pure water inlet 122 and constitutes a part of the pure water passage 125, and the other part of the pure water passage 125 is located in the filter bottle 11; the concentrated water pipe 129 is connected to the concentrated water inlet 123 and constitutes a part of the concentrated water passage 126, and the other part of the concentrated water passage 126 is located in the filter bottle 11.

[0034] In this embodiment, a central tube 112 is provided in the filter bottle 11, and the central tube 112 is located at the center of the filter bottle 11. The tube wall of the central tube 112 has a plurality of water holes 113, which can allow water to flow from the periphery of the central tube 112 into the central tube 112 through the water holes 113. The central tube 112 constitutes another part of the pure water passage 125 and is connected to the pure water pipeline 128, so the central tube 112 and the pure water pipeline 128 constitute a complete pure water passage 125. The reverse osmosis filter element 111 is annularly sleeved outside the central tube 112, and the reverse osmosis filter element 111 constitutes another part of the raw water passage 124 and is connected to the raw water pipeline 127, so the reverse osmosis filter element 111 and the raw water pipeline 127 constitute a complete raw water passage 124. There is a gap between the reverse osmosis filter element 111 and the inner wall of the filter bottle 11 . The gap is annular and constitutes another part of the concentrated water passage 126 , and is connected to the concentrated water pipe 129 . Therefore, the annular gap and the concentrated water pipe 129 constitute a complete concentrated water passage 126 .

[0035] In the present embodiment, more specifically, the filter element seat 12 is arranged at the top of the filter bottle 11, and the central tube 112 is arranged vertically. The raw water enters from the raw water port 121 and flows downwardly into the reverse osmosis filter element 111 along the raw water pipe 127. A part of the raw water is reverse osmosis inwardly in the reverse osmosis filter element 111, and the pure water that has completed the reverse osmosis flows into the central tube 112 through the water hole 113. The pure water flows upward along the central tube 112 and flows into the pure water pipe 128, and is finally output from the pure water port 122. Another part of the raw water in the reverse osmosis filter element 111 forms concentrated water after passing through the reverse osmosis filter element 111. The concentrated water flows upward along the gap and flows into the concentrated water pipe 129, and is finally output from the concentrated water port 123.

[0036] Regarding the variable volume setting of the pure water passage 125, refer to Figure 2 , Figure 3 In one embodiment, a water containing chamber 114 is provided in the filter bottle 11, and the water containing chamber 114 is connected to the central tube 112. The volume of the water containing chamber 114 is variable and is positively correlated with the water pressure of the pure water therein. By providing the water containing chamber 114 with a variable volume, the volume of the pure water passage 125 is variable. When the water pressure increases, the water containing chamber 114 gradually increases, thereby achieving the function of increasing the volume of the pure water channel and storing water.

[0037] More specifically, in this embodiment, the cavity wall of the water containing chamber 114 is a rigid structure, and an elastic diaphragm 115 is arranged in the water containing chamber 114. The elastic diaphragm 115 divides the space of the water containing chamber 114 into two parts, one part of which is connected to the central tube 112, the pure water pipeline 128 and the pure water inlet 122, and this part can change the pure water volume of the water containing chamber 114, and the other part has a compressible medium, and the compressible medium is set to a gas medium. The gas medium can be specifically set to an inert gas such as air or nitrogen. Nitrogen is the best choice. Nitrogen is a gas with very stable chemical properties. It is not easy to react chemically with other substances and has good stability during the compression process.

[0038] In this embodiment, the water containing chamber 114 is connected to the bottom end of the central tube 112 , that is, the water containing chamber 114 is connected to one end of the central tube 112 away from the filter element seat 12 and the pure water inlet 122 .

[0039] In this embodiment, the water chamber 114 is formed by expanding the central tube 112 toward the peripheral direction, so that the cross-sectional area of ​​the water chamber 114 is larger than the central tube 112. Without increasing the size of the filter bottle 11, the upper limit of the water storage capacity of the water chamber 114 can be increased, which is beneficial to increase the upper limit of the pure water output water pressure of the pure water passage 125 and enhance the reflux flushing efficiency.

[0040] Regarding the variable volume setting of the pure water passage 125, refer to Figure 4 In another embodiment, a partition 116 is provided in the central tube 112, and the edge of the partition 116 is attached to the inner wall of the central tube 112, and the space of the central tube 112 is divided into two parts, one part is connected to the pure water pipeline 128 and the pure water port 122, and the other part is not connected to the pure water pipeline 128 and the pure water port 122, and is an independent space. The partition 116 can slide along the central tube 112 and be elastically supported, and the ratio of the two parts of the space separated by the partition 116 is changed, so that the volume of pure water in the central tube 112 can be changed, and the elastically supported partition 116 can make the volume of the central tube 112 positively correlated with the pure water pressure. Both of these embodiments can realize that the volume of the pure water passage 125 is variable, and is positively correlated with the pure water pressure in the pure water passage 125.

[0041] In this embodiment, the bottom end of the central tube 112 is a closed structure. In the space where the central tube 112 is separated by the partition 116 and is not connected to the pure water port 122, at least one elastic member 117 is provided. The two ends of the elastic member 117 respectively support the partition 116. The closed end of the central tube 112 is the bottom end. The elastic member 117 can be provided as a compression spring. If multiple elastic members 117 are provided, the parts supported by the multiple elastic members 117 on the partition 116 are symmetrically arranged about the center of the partition 116, so that the elastic support of the partition 116 is balanced, thereby ensuring that the up and down sliding of the partition 116 is more stable and reliable.

[0042] In this embodiment, a plurality of guide structures are provided on the inner wall of the central tube 112, which are not shown in the figure. The guide structures are circumferentially spaced from each other and extend along the length direction of the central tube 112. The outer periphery of the partition 116 is slidably connected to the guide structures. The guide structures can be specifically configured as vertically extending slide bars, and the outer periphery of the partition 116 is provided with a slot at the corresponding slide bar and is slidably embedded in the slide bar, so that the sliding connection is realized; the slot can also be provided on the inner wall of the central tube 112, and the slide bar can be provided on the outer periphery of the partition 116. By providing the guide structures, the partition 116 can slide up and down smoothly, avoiding the occurrence of jamming, and can also avoid the partition 116 from tilting and causing the sealing failure of its separation.

[0043] The water purification system of this implementation case refers to Figure 1 , and also includes a pre-filter element 6 and a post-filter element 7. The pre-filter element 6 is arranged on the raw water pipe 2, and is used to pre-filter the raw water in the raw water pipe 2, and the raw water after pre-filtration is then transported to the reverse osmosis filtration component 1 for filtration; the pure water pipe 4 connects the reverse osmosis filtration component 1 and the post-filter element 7, and the pure water pipe 4 transports the pure water output by the reverse osmosis filtration component 1 to the post-filter element 7, and the post-filter element 7 performs post-filtration on the pure water, and finally outputs it to the outside through the pure water pipe 4 for use.

[0044] In this embodiment, the pre-filter element 6 is provided to remove larger impurities in the water, such as mud, rust, algae and other particulate matter visible to the naked eye. The pre-filtration can effectively protect the reverse osmosis filter component 1 from the influence of large particle impurities, thereby extending the service life of the entire water purification system. The post-filter element 7 is responsible for intercepting finer pollutants in the pure water, including bacteria, viruses, heavy metal ions and other small molecules that are harmful to the human body. In addition to further purifying the water quality, the activated carbon or other special materials in the post-filter element 7 can also remove discoloration and odor in the water, making the purified water clearer and tastier.

[0045] In this embodiment, the pre-filter element 6 and the post-filter element 7 are combined into a composite filter element 8. Combining the two into a composite filter element 8 can simplify the overall structural setting, simplify the pipeline layout and optimize the space required for the water purification system.

[0046] In this embodiment, a pressure sensor g is provided on the pure water pipe 4 for detecting the pure water outlet pressure of the reverse osmosis filtration component 1, so that the water purification system can determine whether the pure water passage 125 in the reverse osmosis filtration component 1 needs to store pure water according to the size of the pure water outlet pressure.

[0047] Implementation Case 2: A control method is based on the water purification system shown in implementation case 1.

[0048] The control method of this implementation case refers to Figure 1-4 , including water storage mode, water intake mode and backwash mode.

[0049] In the water storage mode of this embodiment, the pure water outlet pressure of the reverse osmosis filter assembly 1 is detected. When the pure water outlet pressure is lower than the first threshold, the water storage mode is started. In the water storage mode, the pure water outlet valve 41 is closed, the raw water inlet valve 21, the booster pump 22 and the concentrated water outlet valve 31 are opened, so that the volume of the pure water passage 125 gradually increases until the pure water outlet pressure of the reverse osmosis filter assembly 1 reaches the second threshold. The pure water outlet pressure is detected by the pressure sensor g. When the pressure state is detected, the pure water cannot be output due to the pure water outlet valve 41. When the raw water inlet valve 21, the booster pump 22 and the concentrated water outlet valve 31 are opened, the raw water is continuously input into the reverse osmosis filter assembly 1, and the raw water passage 124 maintains a high pressure state, so that the pure water can be continuously input into the pure water passage 125, thereby gradually increasing the volume of the pure water passage 125. In the water storage mode, the water storage capacity of the pure water passage 125 can be increased, so that the user can maintain a large water output in the initial stage of water extraction, whether it is water at room temperature or hot water, so that the user has a better experience. In the water storage and water extraction mode, the volume of the pure water passage 125 is in a relatively high state, and the volumes of the two corresponding pure water passages 125 can be changed. In the first embodiment, the volume of the part of the space in the water chamber 114 connected to the central tube 112 is larger, and the volume of the part filled with compressible medium is smaller. In another embodiment, the partition 116 is at a lower horizontal height, so that the volume of the part of the space connected to the pure water port 122 of the central tube 112 is larger, and the volume of the undivided space not connected to the pure water port 122 is smaller.

[0050] In the water intake mode of this embodiment, the raw water inlet valve 21, the booster pump 22, the concentrated water outlet valve 31 and the pure water outlet valve 41 are turned on. When the raw water inlet valve 21 and the booster pump 22 are turned on, the raw water pipe 2 transports raw water, and after the raw water passes through the pre-filtration of the composite filter element 8, it enters the reverse osmosis filter assembly 1 for filtration to generate pure water and concentrated water. When the concentrated water outlet valve 31 is turned on, the concentrated water is discharged from the concentrated water pipe 3. When the pure water outlet valve 41 is turned on, the pure water is transported to the composite filter element 8 through the pure water pipe 4 for post-filtration, and the pure water after post-filtration is output from the tap water pipe t3. In the water intake mode, the volume of the pure water passage 125 is in a relatively low state, and the volumes of the two corresponding pure water passages 125 can be changed. In the first embodiment, the volume of the part of the space in the water chamber 114 connected to the central pipe 112 is relatively small, and the volume of the part of the space filled with the compressible medium is relatively large. In another embodiment, the partition 116 is at a higher level, so that the volume of the space of the central tube 112 connected to the pure water inlet 122 is smaller, and the volume of the undivided space not connected to the pure water inlet 122 is larger.

[0051] In this implementation case, the first threshold is set to 0.03-0.07mTa, the optimal value is set to 0.05mTa, the second threshold is set to 0.2-0.6mTa, and the optimal value is set to 0.4mTa.

[0052] In most usage scenarios, the total amount of water taken by the user is small, and there is no need to input raw water. The use demand can be met only by the pure water stored in the reverse osmosis filter component 1. If the user needs to take a large amount of hot water, the pure water output pressure of the reverse osmosis filter component 1 will continue to drop and drop to the first threshold. Therefore, when the pressure value detected by the pressure sensor g is less than the first threshold, the water storage mode is activated to increase the amount of pure water in the reverse osmosis filter component 1 and the pure water outlet pressure, so that the user can continuously take water.

[0053] The backwash mode of this embodiment has two start-up conditions: one is to stop the normal temperature water intake mode to drive the backwash mode; the other is to drive the backwash mode when the pure water outlet water pressure of the reverse osmosis filtration component 1 reaches a second threshold.

[0054] In the backwash mode of this embodiment, the raw water inlet valve 21 and the pure water outlet valve 41 are closed, the booster pump 22 is turned on, the concentrated water outlet valve 31a seconds is opened and the backwash inlet valve is opened, the backwash water path 5 is connected, and the pure water in the pure water path 125 flows into the booster pump 22. Under the dual effects of the pressure of the pure water path 125 itself and the booster pump 22, the pure water can be transported into the raw water path 124 of the reverse osmosis filter component 1 at a relatively high water pressure to flush the reverse osmosis filter element 111, and all large particles of impurities are discharged from the reverse osmosis filter component 1 along with the concentrated water, thereby playing a purification role.

[0055] Note that the above are only preferred embodiments of the present invention and the technical principles used. Those skilled in the art will understand that the present invention is not limited to the specific embodiments herein, and that various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in more detail through the above embodiments, the present invention is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A water purification system, characterized in that: include: A reverse osmosis filtration component (1) comprises a filtration container having a raw water inlet (121), a pure water inlet (122) and a concentrated water inlet (123); a raw water passage (124) connected to the raw water inlet (121), a pure water passage (125) connected to the pure water inlet (122) and a concentrated water passage (126) connected to the concentrated water inlet (123) are formed in the filtration container; the raw water passage (124) is provided with a reverse osmosis filter element (111), so that raw water flows through the reverse osmosis filter element (111) to generate pure water that flows into the pure water passage (125) and concentrate water that flows through the raw water passage (124) to generate concentrate water that flows into the concentrated water passage (126); the volume of the pure water passage (125) is variable and is positively correlated with the water pressure of the pure water in the pure water passage (125); A raw water pipe (2) provided with a raw water inlet valve (21) and a booster pump (22) for inputting raw water into a raw water inlet (121); a concentrated water pipe (3) provided with a concentrated water outlet valve (31) for discharging concentrated water outputted from the concentrated water inlet (123); A pure water pipe (4) is provided with a pure water outlet valve (41) for discharging the pure water output from the pure water outlet (122); A backwash water circuit (5) is connected to the pure water passage (125) and the input end of the booster pump (22), and is provided with a backwash water inlet valve; when the backwash water circuit (5) is connected, the pure water output from the pure water passage (125) is allowed to flow back and flow into the raw water passage (124) via the booster pump (22) to flush the reverse osmosis filter element (111).

2. The water purification system according to claim 1, characterized in that: The backwash water circuit (5) is provided with a one-way valve (52) for limiting the flow from the pure water channel to the booster pump (22), and the one-way valve (52) is connected in series with the output end of the backwash water inlet pump.

3. The water purification system according to claim 1, characterized in that: The filter container comprises a filter bottle (11) in which the reverse osmosis filter element (111) is arranged, and a filter element seat (12) arranged on the filter bottle (11); the raw water inlet (121), the pure water inlet (122) and the concentrated water inlet (123) are all arranged on the filter element seat (12); the filter element seat (12) is provided with a raw water pipeline (127) connected to the raw water inlet (121) and constituting a part of the raw water passage (124), a pure water pipeline (128) connected to the pure water inlet (122) and constituting a part of the pure water passage (125), and a concentrated water pipeline (129) connected to the concentrated water inlet (123) and constituting a part of the concentrated water passage (126).

4. The water purification system according to claim 3, characterized in that: A central tube (112) having a water hole (113) is provided in the filter bottle (11), and the central tube (112) constitutes a part of the pure water passage (125) and is connected to the pure water pipeline (128); the reverse osmosis filter element (111) is sleeved outside the central tube (112), and the reverse osmosis filter element (111) constitutes a part of the raw water passage (124) and is connected to the raw water pipeline (127); there is a gap between the reverse osmosis filter element (111) and the inner wall of the filter bottle (11), and the gap constitutes a part of the concentrated water passage (126) and is connected to the concentrated water channel.

5. The water purification system according to claim 4, characterized in that: The filter bottle (11) is provided with a water containing chamber (114) connected to the central tube (112); the volume of the water containing chamber (114) is variable and is positively correlated with the water pressure of the pure water therein.

6. The water purification system according to claim 5, characterized in that: The water containing chamber (114) is connected to an end of the central tube (112) away from the filter element seat (12).

7. The water purification system according to claim 5, characterized in that: The water containing chamber (114) is provided with an elastic diaphragm (115) for dividing the space of the water containing chamber (114) into two parts, one part of the space is connected to the central tube (112), and the other part of the space contains a compressible medium, so that the volume of the water containing chamber (114) can be changed and is positively correlated with the pure water pressure.

8. The water purification system according to claim 5, characterized in that: The central tube (112) is provided with a partition (116) for dividing the space of the central tube (112) into two parts. One part of the space is connected to the pure water pipe (4), and the other part is not connected to the pure water passage (125). The partition (116) is movable and elastically supported, so that the volume of pure water in the central tube (112) can be changed and is positively correlated with the pure water pressure in the central tube (112).

9. The water purification system according to claim 8, characterized in that: The space of the central tube (112) which is partitioned by the partition (116) and is not connected to the pure water passage (125) is provided with an elastic member (117) for supporting the partition (116).

10. The water purification system according to any one of claims 1 to 9, characterized in that: Also includes: A pre-filter element (6) for pre-filtering the raw water in the raw water pipe (2); The post-filter element (7) is used for post-filtering the pure water in the pure water pipe (4).

11. The water purification system according to claim 10, characterized in that: The front filter element (6) and the rear filter element (7) are combined into a composite filter element (8).

12. The water purification system according to claim 1, characterized in that: The pure water pipe (4) is provided with a pressure sensor for detecting the outlet water pressure of the pure water of the reverse osmosis filtration assembly (1).

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