Reverse osmosis filter assembly and water purification system

Abstract

The utility model discloses a reverse osmosis filter assembly, which comprises a filter container, a water inlet, a water outlet and a concentrated water outlet, wherein the filter container is provided with a raw water port, a pure water port and a concentrated water port; a central pipe with a water through hole is arranged in the filter, a reverse osmosis filter element is sleeved outside the central pipe, and a gap is formed between the reverse osmosis filter element and the inner wall of the filter; the reverse osmosis assembly is used for generating pure water entering the central pipe from raw water input from the raw water port and generating concentrated water entering the gap, the central pipe is used for outputting the pure water to the pure water port, and the gap is used for outputting the concentrated water from the concentrated water port; the central pipe is communicated with a water containing cavity, and the volume of the water containing cavity can be changed and is in direct proportion to the water pressure of pure water in the water containing cavity. The utility model further discloses a water purification system. The utility model has the beneficial effect that the instantaneous water yield when a user takes water can be improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of reverse osmosis filter assemblies and water purification system, belong to the technical field of kitchen appliances. BACKGROUND

[0002] With the attention to drinking water safety, reverse osmosis water purifier or water purification system gradually becomes indispensable household appliance product in family. Reverse osmosis filter assembly is used in water production, and water molecules are allowed to pass through the membrane of reverse osmosis filter under the action of external pressure to enter the pure water side, and salt ions are intercepted in the concentrated water side.

[0003] Currently, in prior art, the instantaneous water quantity is usually small when user takes water, so that the user's use experience is poor. UTILITY MODEL CONTENT

[0004] The utility model solves the technical problem to provide a kind of reverse osmosis filter assembly and water purification system, can improve the instantaneous water yield when user takes water.

[0005] The utility model is realized by the following technical solutions.

[0006] A kind of reverse osmosis filter assembly, comprising: the filter container with raw water port, pure water port and concentrated water port;Center tube with water passage is provided in the filter container, the center tube is provided with reverse osmosis filter core, and the reverse osmosis filter core and the inner wall of the filter have gap;The reverse osmosis filter core is used to generate the pure water entering the center tube and the concentrated water entering the gap from the raw water input by the raw water port, the center tube is used to output pure water to the pure water port, and the gap is used to output concentrated water to the concentrated water port;The center tube is communicated with water containing cavity, the volume of the water containing cavity can change, and it is proportional to the pure water pressure in it.

[0007] As a further improvement of the utility model, the water containing cavity is provided with elastic diaphragm separating the space of the water containing cavity into two parts, one part of space is communicated with the center tube, and the other part of space has compressible medium, so that the volume of the water containing cavity can change and is proportional to the pure water pressure.

[0008] As a further improvement of the utility model, the compressible medium is set as gaseous medium.

[0009] As a further improvement of the utility model, the water containing cavity is formed by the center tube extending outwardly.

[0010] As a further improvement of the utility model, the water containing cavity is communicated at the end of the center tube away from the pure water port.

[0011] As a further improvement of the present application, the filter container comprises a filter bottle in which the reverse osmosis filter element is arranged, and a filter element seat arranged on the filter bottle; the raw water inlet, the pure water outlet and the concentrated water outlet are arranged on the filter element seat; the filter element seat is provided with a raw water pipeline, the raw water pipeline connects the raw water inlet and the reverse osmosis filter element, and forms a raw water passage in the filter container; the filter element seat is provided with a pure water pipeline, the pure water pipeline connects the pure water outlet and the central pipe, and forms a pure water passage in the filter container; the filter element seat is provided with a concentrated water pipeline, the concentrated water pipeline connects the concentrated water outlet and the gap, and forms a concentrated water passage in the filter container.

[0012] As a further improvement of the present application, the pure water pipeline and the raw water pipeline are connected with a backflushing water path which can be blocked or connected; when the backflushing water path is connected, the pure water in the pure water pipeline is allowed to flow into the raw water pipeline, and the reverse osmosis filter element is flushed.

[0013] As a further improvement of the present application, the backflushing water path is provided with a one-way valve which limits the flow from the pure water pipeline to the raw water pipeline; the one-way valve is provided with a pressure difference threshold value; when the water pressure difference between the pure water pipeline and the raw water pipeline reaches the pressure difference threshold value, the one-way valve is opened; when the water pressure difference between the pure water pipeline and the raw water pipeline does not reach the pressure difference threshold value, the one-way valve is closed.

[0014] A water purification system comprises:

[0015] the reverse osmosis filter assembly;

[0016] a raw water pipeline for inputting raw water into the raw water inlet of the reverse osmosis filter assembly, the raw water pipeline being provided with a raw water inlet valve and a booster pump;

[0017] a concentrated water pipeline for discharging concentrated water output by the concentrated water outlet of the reverse osmosis filter assembly, the concentrated water pipeline being provided with a concentrated water outlet valve;

[0018] a normal temperature water pipeline and a hot water pipeline which are arranged in parallel and are used for discharging pure water output by the pure water outlet of the reverse osmosis filter assembly, the normal temperature water pipeline being provided with a normal temperature outlet valve, and the hot water pipeline being provided with a flow control pump and a heating pipe.

[0019] As a further improvement of the present application, the water purification system further comprises:

[0020] a pre-filter element for pre-filtering the raw water in the raw water pipeline;

[0021] a pure water pipeline for outputting the pure water generated by the reverse osmosis filter assembly;

[0022] A post-filtering cartridge is arranged to post-filter the pure water in the pure water pipe and to deliver the post-filtered pure water to the normal temperature water pipe and the hot water pipe.

[0023] The present application has the following advantages:

[0024] The water storage cavity is arranged to change the volume of the pure water passage, and the water storage cavity gradually increases when the water pressure increases, thereby increasing the volume of the pure water passage and the water storage function, and increasing the instantaneous water output when the user takes water. BRIEF DESCRIPTION OF DRAWINGS

[0025] The preferred embodiments of the present application will be described in detail below with reference to the accompanying drawings, which are intended to help understand the purpose and advantages of the present application, in which:

[0026] Figure 1 FIG. 1 is a schematic view of a reverse osmosis filtering assembly according to an embodiment of the present application;

[0027] Figure 2 FIG. 2 is a schematic view of a filter cartridge seat according to an embodiment of the present application;

[0028] Figure 3 FIG. 3 is a schematic view of a reverse osmosis filtering assembly according to an embodiment of the present application, in which a water storage cavity is arranged;

[0029] Figure 4 FIG. 4 is a schematic view of a reverse osmosis filtering assembly according to an embodiment of the present application, in which a partition is arranged;

[0030] Figure 5 FIG. 5 is a schematic view of a water purification system according to an embodiment of the present application. DETAILED DESCRIPTION

[0031] The present application will be described in further detail below with reference to the accompanying drawings and embodiments.

[0032] In this specification, the orientation terms such as up, down, left, right, front, back, front surface, back surface, top, bottom, etc. mentioned or possibly mentioned are defined with respect to the configuration shown in the drawings, and the words "inner" and "outer" refer to the direction toward or away from the geometric center of a particular component, which are relative concepts, and thus can change accordingly depending on the different positions, different use states, etc. Therefore, these or other orientation terms should not be interpreted as limiting terms.

[0033] Embodiment 1

[0034] A reverse osmosis filtering assembly, with reference to Figures 1-4The filter container 1 has a raw water inlet h1, a pure water outlet h2, and a concentrated water outlet h3, and has a raw water passage r1, a pure water passage r2, and a concentrated water passage r3. The raw water passage r1 and the raw water inlet h1 are communicated, raw water is input into the filter container 1 through the raw water inlet h1, the raw water flows along the raw water passage r1, the pure water passage r2 and the pure water outlet h2 are communicated, the pure water in the filter container 1 flows along the pure water passage r2 and is output from the filter container 1 through the pure water outlet h2, and the concentrated water passage r3 and the pure water outlet h2 are communicated, the concentrated water in the filter container 1 flows along the concentrated water passage r3 and is output from the filter container 1 through the concentrated water outlet h3.

[0035] The raw water passage r1 is provided with a reverse osmosis filter core 13, also known as a RO reverse osmosis pure water machine filter core, which 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 dissolved solids, inorganic salts, organic matter, colloids, bacteria, viruses, and larger molecules and particles cannot pass through and are blocked and discharged with concentrated water. Therefore, the reverse osmosis filter core 13 can filter raw water to form pure water and concentrated water. In this embodiment, the raw water passes through the reverse osmosis filter core 13 to generate pure water flowing into the pure water passage r2 and concentrated water flowing into the concentrated water passage r3, and the pure water passage r2 and the concentrated water passage r3 are in parallel with the raw water passage r1 in the filter container 1.

[0036] In this embodiment, the volume of the pure water passage r2 can vary and is proportional to the water pressure of the pure water in the pure water passage r2. Therefore, the pure water passage r2 of this embodiment can store pure water by increasing the water pressure of the pure water in the pure water passage r2, and the most direct effect is that the instantaneous water pressure can be increased when releasing pure water, so that the user can obtain a more objective water output at the moment of taking water.

[0037] In this embodiment, the pure water passage r2 and the raw water passage r1 are connected with a backflush water path r4, which can be blocked or communicated. When the backflush water path r4 is blocked, the pure water in the pure water passage r2 and the raw water in the raw water passage r1 do not interfere with each other, and when the backflush water path r4 is communicated, the pure water in the pure water passage r2 is allowed to flow into the raw water passage r1 through the backflush water path r4, and the reverse osmosis filter core 13 in the raw water passage r1 is flushed. The flushing effect can completely replace the concentrated water in the reverse osmosis filter core 13, so that the reverse osmosis filter core 13 does not contain larger molecules and particles such as solids, inorganic salts, organic matter, colloids, bacteria, and viruses, thereby greatly reducing the TDS value of the first cup of water when the user takes water.

[0038] In the embodiment, the backwash water path r4 is connected to the raw water path r1 upstream of the reverse osmosis filter core 13. When backwashing is needed, the backwash water path is connected, and the pure water in the pure water path r2 flows into the raw water path r1 upstream of the reverse osmosis filter core 13 through the backwash water path r4, so that the pure water can flow into the reverse osmosis filter core 13 from the water inlet end and flow out from the water outlet end, thereby fully covering the flushing of the reverse osmosis filter core 13, improving the cleanliness of the flushing of the reverse osmosis filter core 13, and avoiding the residual of macromolecules and particles in the reverse osmosis filter core 13. In addition, in the prior art, backwashing is performed by flowing pure water back to the reverse osmosis filter core 13. The reverse osmosis filter core 13 is structurally composed of multiple layers of reverse osmosis membranes. Whether it is raw water filtration or pure water backflow, water is filtered through multiple layers of reverse osmosis membranes. When filtering, a large water pressure difference is needed to make the raw water permeate through the membranes. When backwashing, it is difficult to provide a large water pressure difference, so that the permeation of pure water back to the reverse osmosis filter core 13 is relatively low. Due to the high difficulty of permeation, a large amount of pure water is consumed for reverse osmosis. In the embodiment, since the pure water is not backflowed to the reverse osmosis filter core 13, but introduced to the upstream of the reverse osmosis filter core 13 through the backwash water path r4, the pure water flows along the original flow direction of the raw water to flush the reverse osmosis filter core 13, so that the flow resistance of the pure water during backwashing is greatly reduced compared with the prior art. Not only the flushing efficiency is improved, but also the reverse osmosis filter core 13 can be completely flushed, and the consumption of pure water is greatly reduced compared with the prior art.

[0039] In the embodiment, the backwash water path r4 is provided with a one-way valve 16, which limits the flow from the pure water path r2 to the raw water path r1. The one-way valve 16 is set with a pressure difference threshold. When the water pressure difference between the pure water path r2 and the raw water path r1 reaches the pressure difference threshold, the one-way valve 16 opens. When the water pressure difference between the pure water path r2 and the raw water path r1 does not reach the pressure difference threshold, the one-way valve 16 closes. Generally, when the raw water inlet h1 stops inputting raw water, the pure water outlet h2 stops outputting pure water, and the concentrated water outlet h3 maintains outputting concentrated water, the water pressure difference between the pure water path r2 and the raw water path r1 can reach the pressure difference threshold, so that the one-way valve 16 opens to enter the backwashing state. It should be noted that the pure water path r2 in the water storage state not only can reach the pressure difference threshold to open the one-way valve 16, but also can provide sufficient pure water to flow into the raw water path r1 through the backwash water path r4 to flush the reverse osmosis filter core 13, thereby further optimizing the effect and efficiency of backwashing.

[0040] For the specific structural composition of the filter container 1, in the present embodiment, the filter container 1 comprises a filter bottle 11 and a filter core seat 12. The filter bottle 11 is a structure with an opening and a hollow interior, a reverse osmosis filter core 13 is arranged in the filter bottle 11, and the filter core seat 12 is arranged at the opening of the filter bottle 11, thereby forming a sealed structure with the filter bottle 11. The raw water port h1, the pure water port h2, and the concentrated water port h3 are all arranged on the filter core seat 12. The filter core seat 12 is provided with a raw water pipeline 121, a pure water pipeline 122, and a concentrated water pipeline 123. The raw water pipeline 121 is in communication with the raw water port h1 and constitutes part of a raw water passage r1, and the other part of the raw water passage r1 is located in the filter bottle 11. The pure water pipeline 122 is in communication with the pure water port h2 and constitutes part of a pure water passage r2, and the other part of the pure water passage r2 is located in the filter bottle 11. The concentrated water pipeline 123 is in communication with the concentrated water port h3 and constitutes part of a concentrated water passage r3, and the other part of the concentrated water passage r3 is located in the filter bottle 11.

[0041] In the present embodiment, a backflushing water passage r4 is arranged in the filter core seat 12 and connects the pure water pipeline 122 and the raw water pipeline 121, and the reverse osmosis filter core 13 is arranged in the filter bottle 11, so that the pure water of the backflushing water passage r4 flows into the upstream of the reverse osmosis filter core 13, thereby enabling the pure water to flush the reverse osmosis filter core 13.

[0042] In the present embodiment, a central pipe 14 is arranged in the filter bottle 11, the central pipe 14 is located at the center of the filter bottle 11, the pipe wall of the central pipe 14 has a plurality of water passing holes 141, which enable water to flow from the periphery of the central pipe 14 into the central pipe 14 through the water passing holes 141, the central pipe 14 constitutes the other part of the pure water passage r2 and is in communication with the pure water pipeline 122, so the central pipe 14 and the pure water pipeline 122 constitute a complete pure water passage r2. The reverse osmosis filter core 13 is annularly arranged outside the central pipe 14, the reverse osmosis filter core 13 constitutes the other part of the raw water passage r1 and is in communication with the raw water pipeline 121, so the reverse osmosis filter core 13 and the raw water pipeline 121 constitute a complete raw water passage r1. The gap 15 between the reverse osmosis filter core 13 and the inner wall of the filter bottle 11 is annular and constitutes the other part of the concentrated water passage r3 and is in communication with the concentrated water pipeline 123, so the annular gap 15 and the concentrated water pipeline 123 constitute a complete concentrated water passage r3.

[0043] In this embodiment, more specifically, the filter cartridge holder 12 is located at the top of the filter bottle 11, and the central tube 14 is vertically arranged. Raw water enters through the raw water inlet h1 and flows downward along the raw water pipe 121 into the reverse osmosis filter cartridge 13. A portion of the raw water undergoes reverse osmosis in the reverse osmosis filter cartridge 13, and the pure water that has completed reverse osmosis flows into the central tube 14 through the water passage 141. The pure water flows upward along the central tube 14 and flows into the pure water pipe 122, and is finally output from the pure water inlet h2. Another portion of the raw water in the reverse osmosis filter cartridge 13 forms concentrated water after flowing through the reverse osmosis filter cartridge 13. The concentrated water flows upward along the gap 15 and flows into the concentrated water pipe 123, and is finally output from the concentrated water inlet h3.

[0044] Regarding the variable volume setting for the pure water passage r2, please refer to... Figure 3 In one embodiment, a water-containing cavity 17 is provided inside the filter bottle 11. The water-containing cavity 17 is connected to the central tube 14. The volume of the water-containing cavity 17 is variable and is proportional to the pure water pressure inside. By providing a water-containing cavity 17 with variable volume, the volume of the pure water passage r2 can be varied. When the water pressure increases, the water-containing cavity 17 gradually increases, thereby achieving the function of increasing the volume of the pure water passage and storing water.

[0045] More specifically, in this embodiment, the wall of the water-containing cavity 17 is a rigid structure, and an elastic diaphragm 171 is provided inside the water-containing cavity 17. The elastic diaphragm 171 divides the space of the water-containing cavity 17 into two parts. One part is connected to the central tube 14, the pure water pipe 122, and the pure water outlet h2. This part can change the pure water volume of the water-containing cavity 17. The other part contains a compressible medium, which is set as a gaseous medium. Specifically, the gaseous medium can be set as an inert gas such as air or nitrogen. Nitrogen is the optimal choice because nitrogen is a chemically very stable gas that does not easily react with other substances and has good stability during compression.

[0046] In this embodiment, the water-containing cavity 17 is connected to the bottom end of the central tube 14, that is, the water-containing cavity 17 is connected to the end of the central tube 14 away from the filter element seat 12 and the pure water outlet h2.

[0047] In this embodiment, the water-containing cavity 17 is formed by extending outward from the central tube 14, so that the cross-sectional area of ​​the water-containing cavity 17 is larger than that of the central tube 14, thereby increasing the water storage capacity of the water-containing cavity 17 without increasing the size of the filter bottle 11.

[0048] Regarding the variable volume setting for the pure water passage r2, please refer to... Figure 4In another embodiment, the center tube 14 is provided with a partition 18, the edge of the partition 18 is attached to the inner wall of the center tube 14, and the space of the center tube 14 is divided into two parts, one part is communicated with the pure water pipe 122 and the pure water outlet h2, and the other part is not communicated with the pure water pipe 122 and the pure water outlet h2, and is an independent space. The partition 18 can slide along the center tube 14 and be elastically supported, and the proportion of the two parts divided by the partition 18 can be changed, so that the volume of the pure water in the center tube 14 can be changed, and the elastically supported partition 18 can make the volume of the center tube 14 and the pure water pressure in the pure water passage r2 be proportional. Both of the two embodiments can realize that the volume of the pure water passage r2 can be changed and is proportional to the pure water pressure in the pure water passage r2.

[0049] In the embodiment, the bottom end of the center tube 14 is a closed structure, and the space of the center tube 14 divided by the partition 18 and not communicated with the pure water outlet h2 is provided with at least one elastic member 181, and the two ends of the elastic member 181 are respectively supported on the partition 18 and the bottom end of the center tube 14 which is closed. The elastic member 181 can be a compression spring, and if a plurality of elastic members 181 are provided, the positions of the plurality of elastic members 181 supported on the partition 18 are symmetrically arranged about the center of the partition 18, so that the elastic support of the partition 18 is balanced, thereby ensuring that the up-down sliding of the partition 18 is more stable and reliable.

[0050] In the embodiment, the inner wall of the center tube 14 is provided with a plurality of guide structures which are not shown in the figure, the guide structures are circumferentially spaced apart from each other and extend along the length direction of the center tube 14, and the outer periphery of the partition 18 is slidably connected with the guide structures. The guide structure can be specifically provided as a vertically extending slide bar, and the outer periphery of the partition 18 is provided with a clamping groove at the corresponding slide bar and is slidably clamped on the slide bar, so that the slide connection is realized; or the inner wall of the center tube 14 is provided with a clamping groove, and the outer periphery of the partition 18 is provided with a slide bar, and the guide structure can make the up-down sliding of the partition 18 smooth and avoid the situation that the partition 18 is tilted and causes the sealing failure of the partition 18.

[0051] Embodiment 2:

[0052] A water purification system, referring to Figure 5 and combining Figures 1-4, including a reverse osmosis filtration assembly 1, a raw water pipe t1, a concentrated water pipe t2, a normal temperature water pipe t3 and a hot water pipe t4. The reverse osmosis filtration assembly 1 is as shown in the embodiment 1, the raw water pipe t1 is used to input raw water to the raw water inlet h1 of the reverse osmosis filtration assembly 1, and the raw water pipe t1 is provided with a raw water inlet valve v1 and a booster pump p1; the concentrated water pipe t2 is used to discharge the concentrated water output by the concentrated water outlet h3 of the reverse osmosis filtration assembly 1, and the concentrated water pipe t2 is provided with a concentrated water outlet valve v2; the normal temperature water pipe t3 and the hot water pipe t4 are connected in parallel and used to discharge the pure water output by the pure water outlet h2 of the reverse osmosis filtration assembly 1, the normal temperature water pipe t3 is provided with a normal temperature outlet valve v3, and the hot water pipe t4 is provided with a flow control pump p2 and a heating pipe c1.

[0053] By setting the above pipe structure, the valve structure arranged on the pipe, and the booster pump p1, the heating pipe c1 and other functional structures, the water purification system can efficiently and quickly output normal temperature water and hot water. In addition, the structure of the whole water purification system is simplified, and the pipeline layout is optimized.

[0054] The water purification system of the embodiment further includes a pre-filter core f1, a post-filter core f2 and a pure water pipe t5. The pre-filter core f1 is arranged on the raw water pipe t1 and used to pre-filter the raw water in the raw water pipe t1, and the pre-filtered raw water is then conveyed to the reverse osmosis filtration assembly 1 for filtration. The pure water pipe t5 connects the reverse osmosis filtration assembly 1 and the post-filter core f2, and conveys the pure water output by the reverse osmosis filtration assembly 1 to the post-filter core f2. The post-filter core f2 post-filters the pure water. The normal temperature water pipe t3 and the hot water pipe t4 are connected in parallel to the post-filter core f2, and the normal temperature water or the hot water is output according to the user's selection.

[0055] The pre-filter core f1 can remove larger impurities such as silt, rust, algae and other visible particulate matter in the water, and pre-filtering can effectively protect the reverse osmosis filtration assembly 1 from the influence of large particle impurities, thereby prolonging the service life of the whole water purification system. The post-filter core f2 is responsible for intercepting finer pollutants in the pure water, including bacteria, viruses, heavy metal ions and other small molecular substances harmful to the human body. In addition to further purifying the water quality, the activated carbon or other special materials in the post-filter core f2 can also remove the color and odor in the water, so that the purified water is clearer and tastes better.

[0056] In the embodiment, the pre-filter core f1 and the post-filter core f2 are combined into a composite filter core f, which can simplify the overall structure, simplify the pipe layout and optimize the space required by the water purification system.

[0057] In the embodiment, a pressure sensor g is arranged on the pure water pipe t5 to detect the pure water outlet pressure of the reverse osmosis filtering assembly 1, so that the water purification system can determine whether the pure water passage r2 of the reverse osmosis filtering assembly 1 needs to store pure water according to the pure water outlet pressure.

[0058] In the embodiment, the hot water pipe t4 is provided with a flow meter c2, which can be arranged between the flow control pump p2 and the heating pipe c1. The flow meter c2 can detect the flow of the hot water in the hot water pipe t4, and the flow control pump p2 can cooperate with the flow meter c2 to accurately control the hot water outlet amount of the hot water pipe t4.

[0059] Embodiment 3:

[0060] A control method based on the water purification system shown in Embodiment 2.

[0061] The control method of the embodiment is described with reference to Figure 5 and in combination with Figures 1-4 , which includes normal temperature water taking mode, water storage mode, hot water taking mode and backwashing mode.

[0062] In the normal temperature water taking mode of the embodiment, the flow control pump p2 and the heating pipe c1 are closed, and the raw water inlet valve v1, the booster pump p1, the concentrated water outlet valve v2 and the normal temperature water outlet valve v3 are opened. When the raw water inlet valve v1 and the booster pump p1 are opened, the raw water pipe t1 delivers raw water, the raw water passes through the pre-filter of the composite filter element f, enters the reverse osmosis filtering assembly 1 to generate pure water and concentrated water, when the concentrated water outlet valve v2 is opened, the concentrated water is discharged from the concentrated water pipe t2, and when the normal temperature water outlet valve v3 is opened, the pure water is delivered to the composite filter element f for post-filtering through the pure water pipe t5. The pure water after post-filtering is output by the normal temperature water pipe t3. In the normal temperature water taking mode, the volume of the pure water passage r2 is in a low state, and the volume of the two pure water passages r2 can be changed. In the first embodiment, the part of the space volume of the central pipe 14 in the water storage cavity 17 is small, and the part of the space volume filled with compressible medium is large. In another embodiment, the partition plate 18 is at a high level, so that the part of the space volume of the central pipe 14 connected to the pure water outlet h2 is small, and the part of the space volume not connected to the pure water outlet h2 is large.

[0063] In the water storage mode of the present embodiment, the water pressure of the pure water outlet of the reverse osmosis filtration assembly 1 is detected, and when the water pressure of the pure water outlet is lower than the first threshold value, the water storage mode is started, and in the water storage mode, the normal-temperature water outlet valve v3, the flow control pump p2 and the heating pipe c1 are closed, and the raw water inlet valve v1, the booster pump p1 and the concentrated water outlet valve v2 are opened, so that the volume of the pure water passage r2 gradually increases until the water pressure of the pure water outlet of the reverse osmosis filtration assembly 1 reaches the second threshold value. The water pressure of the pure water outlet is detected by the pressure sensor g, and when the pressure state is detected, since the normal-temperature water outlet valve v3 and the flow control pump p2 are closed, the pure water cannot be output, and in the case where the raw water inlet valve v1, the booster pump p1 and the concentrated water outlet valve v2 are opened, the raw water is continuously input into the reverse osmosis filtration assembly 1, the raw water passage r1 maintains a high-pressure state, so that the pure water can be continuously input into the pure water passage r2, thereby gradually increasing the volume of the pure water passage r2. In the water storage mode, the water storage capacity of the pure water passage r2 can be improved, so that the user can maintain a large water output in the initial stage of water taking whether it is normal-temperature water taking or hot water taking, so that the user's use experience is better. In the water storage taking mode, the volume of the pure water passage r2 is in a higher state, and the volume of the pure water passage r2 can be set in two ways, in the first embodiment, the part of the space volume of the central pipe 14 in the water storage cavity 17 is large, and the part of the space volume filled with compressible medium is small. In another embodiment, the partition plate 18 is at a lower level, so that the part of the space volume of the central pipe 14 connected to the pure water outlet h2 is large, and the part of the space volume not connected to the pure water outlet h2 is small.

[0064] In the present embodiment, the first threshold value is set to 0.03-0.07 mTa, and the optimal value is set to 0.05 mTa, and the second threshold value is set to 0.2-0.6 mTa, and the optimal value is set to 0.4 mTa.

[0065] In the hot water taking mode of the embodiment, the raw water inlet valve v1, the booster pump p1, the concentrated water outlet valve v2 and the normal temperature water inlet valve are closed, and the flow control pump p2 and the heating pipe c1 are opened. In the hot water taking mode, since the raw water inlet valve v1, the booster pump p1, the concentrated water outlet valve v2 and the normal temperature water inlet valve are all in the closed state, the raw water stops being input to the reverse osmosis filtration assembly 1, and the concentrated water stops being discharged. The reverse osmosis filtration assembly 1 outputs the pure water stored in the pure water passage r2, and the pure water is output by the hot water pipe t4 under the control of the flow control pump p2 after being filtered by the rear filter of the composite filter core f. The pure water is heated by the heating pipe c1 to form hot water and then output. In most use scenarios, the user takes a small amount of hot water, and only the pure water stored in the reverse osmosis filtration assembly 1 can meet the use demand without inputting raw water. In addition, compared with the prior art, since the volume of the pure water passage r2 can be changed in the embodiment, the flow of the heated water can be regulated without pure water backflow, the control logic is simplified, and water waste is avoided.

[0066] It should be noted that in the embodiment, if the user needs to take a large amount of hot water, the pure water output pressure of the reverse osmosis filtration assembly 1 will continuously decrease and reach the first threshold value. Therefore, when the pressure value detected by the pressure sensor g is less than the first threshold value, the water storage mode is started again to increase the amount of pure water in the reverse osmosis filtration assembly 1 and the outlet water pressure of the pure water, so that the user can continuously take hot water.

[0067] The backwashing mode of the embodiment has two starting conditions, one is to stop the normal temperature water taking mode to drive the backwashing mode, and the other is to drive the backwashing mode when the pure water outlet water pressure of the reverse osmosis filtration assembly 1 reaches the second threshold value.

[0068] In the backwash mode of the embodiment, the raw water inlet valve v1, the booster pump p1, the normal temperature water inlet valve, the flow control pump p2 and the heating pipe c1 are closed, the concentrated water outlet valve v2 is opened for 2 seconds and the backwash water path r4 is connected, so that the pure water in the pure water path r2 flows into the raw water path r1, and the reverse osmosis filter element 13 is flushed. The raw water inlet valve v1 and the booster pump p1 are in the closed state, the concentrated water outlet valve v2 is in the open state, and since the raw water path r1 and the pure water path r2 in the reverse osmosis filter element 13 assembly are directly connected, the reverse osmosis filter assembly 1 is in a state of not inputting raw water but continuously outputting concentrated water, so that the water pressure in the raw water path r1 is in a low pressure state, and since the normal temperature water inlet valve and the flow control pump p2 are in the closed state, the reverse osmosis filter assembly 1 is in a state of not outputting pure water, so that the water pressure in the pure water path r2 is kept in a high pressure state, so that the water pressure in the pure water path r2 is greater than the water pressure in the raw water path r1, and the water pressure difference between the two reaches the pressure difference threshold, the pure water in the pure water path r2 flows into the raw water path r1 through the backwash water path r4, and the reverse osmosis filter element 13 is flushed, so that the large particles contained in the concentrated water are completely discharged out of the reverse osmosis filter assembly 1, thereby achieving purification.

[0069] In the embodiment, the time for opening the concentrated water outlet valve v2 in the backwash mode is 3-10 seconds, that is, all the large particles in the reverse osmosis filter assembly 1 can be completely discharged and purified.

[0070] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A reverse osmosis filtration assembly, characterized by, The application relates to a filter container (1) with a raw water inlet (h1), a pure water outlet (h2) and a concentrated water outlet (h3); the filter container (1) is provided with a central pipe (14) with a water passing hole (141), the central pipe (14) is externally provided with a reverse osmosis filter core (13), and a gap (15) is formed between the reverse osmosis filter core (13) and the inner wall of the filter; the reverse osmosis filter core (13) is used for generating pure water entering the central pipe (14) and concentrated water entering the gap (15) from raw water input by the raw water inlet (h1); the central pipe (14) is used for outputting pure water to the pure water outlet (h2); the gap (15) is used for outputting concentrated water to the concentrated water outlet (h3); and the central pipe (14) is communicated with a water containing cavity (17), the volume of the water containing cavity (17) can be changed, and the volume of the water containing cavity (17) is proportional to the pure water pressure in the water containing cavity (17). An elastic diaphragm (171) is arranged in the water containing cavity (17) to divide the space of the water containing cavity (17) into two parts, one part is communicated with the central pipe (14), and the other part is provided with compressible medium, so that the volume of the water containing cavity (17) can be changed and is proportional to the pure water pressure.

2. The reverse osmosis filtration assembly of claim 1, wherein, The compressible medium is arranged as gas medium.

3. The reverse osmosis filtration assembly of claim 2, wherein, The water containing cavity (17) is formed by expanding the central pipe (14) to the outer circumferential direction.

4. The reverse osmosis filtration assembly of claim 1, wherein, The water containing cavity (17) is communicated at the end of the central pipe (14) far away from the pure water outlet (h2).

5. The reverse osmosis filtration assembly of claim 1, wherein, The filter container (1) comprises a filter bottle (11) internally provided with the reverse osmosis filter core (13) and a filter core seat (12) arranged on the filter bottle (11); the raw water inlet (h1), the pure water outlet (h2) and the concentrated water outlet (h3) are arranged on the filter core seat (12); the filter core seat (12) is provided with a raw water pipeline (121) communicated with the raw water inlet (h1) and the reverse osmosis filter core (13) and forming a raw water passage (r1) in the filter container (1); the filter core seat (12) is provided with a pure water pipeline (122) communicated with the pure water outlet (h2) and the central pipe (14) and forming a pure water passage (r2) in the filter container (1); and the filter core seat (12) is provided with a concentrated water pipeline (123) communicated with the concentrated water outlet (h3) and the gap (15) and forming a concentrated water passage (r3) in the filter container (1).

6. The reverse osmosis filtration assembly of any one of claims 1-5, wherein, The pure water pipeline (122) and the raw water pipeline (121) are connected with a back flushing water path (r4) which can be blocked or communicated; when the back flushing water path (r4) is communicated, pure water in the pure water pipeline (122) is allowed to flow into the raw water pipeline (121) and the reverse osmosis filter core (13) is flushed.

7. The reverse osmosis filtration assembly of claim 6, wherein, ​ 8. The reverse osmosis filtration assembly of claim 7, wherein, The backflush water path (r4) is provided with a one-way valve (16) defining the flow from the pure water pipe (122) to the raw water pipe (121), the one-way valve (16) is provided with a pressure difference threshold, the one-way valve (16) is opened when the water pressure difference between the pure water pipe (122) and the raw water pipe (121) reaches the pressure difference threshold, and the one-way valve (16) is closed when the water pressure difference between the pure water pipe (122) and the raw water pipe (121) does not reach the pressure difference threshold.

9. A water purification system characterized by, Comprise: The reverse osmosis filter assembly of any one of claims 1-8; A raw water pipe (t1) for inputting raw water to a raw water inlet (h1) of the reverse osmosis filter assembly, the raw water pipe (t1) is provided with a raw water inlet valve (v1) and a booster pump (p1); A concentrated water pipe (t2) for discharging concentrated water output by a concentrated water outlet (h3) of the reverse osmosis filter assembly, the concentrated water pipe (t2) is provided with a concentrated water outlet valve (v2); A normal temperature water pipe (t3) and a hot water pipe (t4) connected in parallel for discharging pure water output by a pure water outlet (h2) of the reverse osmosis filter assembly, the normal temperature water pipe (t3) is provided with a normal temperature outlet valve (v3), and the hot water pipe (t4) is provided with a flow control pump (p2) and a heating pipe (c1).

10. The water purification system of claim 9, wherein, Further comprise: A pre-filter element (f1) for pre-filtering raw water in the raw water pipe (t1); A pure water pipe (t5) for outputting pure water generated by the reverse osmosis filter assembly; A post-filter element (f2) for post-filtering pure water of the pure water pipe (t5), and conveying the post-filtered pure water to the normal temperature water pipe (t3) and the hot water pipe (t4).

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