Water purification system

Abstract

The invention discloses a water purification system, which comprises: a reverse osmosis filter assembly, which is internally provided with a reverse osmosis filter core; the raw water pipe is used for inputting raw water to the reverse osmosis filtering assembly, and the raw water pipe is provided with a raw water inlet valve and a booster pump; the concentrated water pipe is used for discharging concentrated water output by the reverse osmosis filtering assembly, and the concentrated water pipe is provided with a concentrated water outlet valve; the normal-temperature water pipe and the water storage pipe are arranged in parallel and are used for discharging pure water output by the reverse osmosis filtering assembly; the normal-temperature water pipe is provided with a normal-temperature water outlet valve; the water storage pipe is provided with a water storage valve and a water storage tank, the water storage tank is used for storing pure water output by the reverse osmosis filter assembly, the output of the pure water is controlled by the flow control pump, and the pure water is provided for the hot water pipe and the backwashing pipe; the hot water pipe is provided with a heating pipe and is used for discharging hot water; the backwashing pipe is provided with a pure water return valve and is used for inputting pure water into the reverse osmosis filter assembly to wash the reverse osmosis filter element. The beneficial effect of the invention is that the overall structure is optimized through function integration.

Description

Technical Field

[0001] The invention relates to a water purification system and belongs to the technical field of kitchen appliances. Background Art

[0002] The household water purification system is one of the common water treatment equipment in modern households. It is mainly used to remove impurities and harmful substances in tap water, improve water quality, and ensure the safety and health of drinking water according to different filtration technologies and functional requirements.

[0003] At present, in the prior art, the water purification system in the prior art has a relatively complex structural design, especially the complicated layout of the pipelines, which not only causes the overall structure to be highly complex, but also has an adverse effect on the water extraction efficiency of users for obtaining normal temperature water and hot water. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a water system, which optimizes the overall structure through functional integration and improves the overall efficiency of the system.

[0005] The present invention is achieved through the following technical solutions.

[0006] A water purification system, comprising:

[0007] A reverse osmosis filtration component, wherein a reverse osmosis filter element is arranged inside;

[0008] A raw water pipe, used to input raw water into the reverse osmosis filtration assembly, wherein the raw water pipe is provided with a raw water inlet valve and a booster pump;

[0009] A concentrated water pipe, used for discharging concentrated water outputted by the reverse osmosis filtration assembly, wherein the concentrated water pipe is provided with a concentrated water outlet valve;

[0010] A normal temperature water pipe and a water storage pipe are arranged in parallel, and are used to discharge the pure water output by the reverse osmosis filtration assembly; the normal temperature water pipe is provided with a normal temperature water outlet valve; the water storage pipe is provided with a water storage valve and a water storage tank, and the water storage tank is used to store the pure water output by the reverse osmosis filtration assembly, and the output of the pure water is controlled by a flow control pump and provides pure water to the hot water pipe and the backwash pipe;

[0011] The hot water pipe is provided with a heating pipe and is used for discharging hot water; the backwash pipe is provided with a pure water reflux valve and is used for inputting pure water into the reverse osmosis filter assembly to flush the reverse osmosis filter element.

[0012] As a further improvement of the present invention, the reverse osmosis filtration component is provided with a raw water passage for receiving raw water input from the raw water pipe, the pure water passage for outputting pure water to the normal temperature water pipe and the water storage tank and receiving pure water input from the backwash pipe, and a concentrated water passage for outputting concentrated water to the concentrated water pipe; the reverse osmosis filter element is arranged in the raw water passage, so that raw water in the reverse osmosis filter element generates pure water entering the pure water passage through reverse osmosis flow direction, and generates concentrated water entering the concentrated water passage through the raw water flow direction.

[0013] As a further improvement of the present invention, the pure water passage and the raw water passage are connected with a backwash water passage that can be blocked or connected. The backwash water passage is used to connect when the backwash pipe inputs pure water to the reverse osmosis filtration component, allowing the pure water in the pure water passage to flow into the raw water passage and flush the reverse osmosis filter element.

[0014] As a further improvement of the present invention, the backwash water path is connected to the raw water path at a position upstream of the reverse osmosis filter element.

[0015] As a further improvement of the present invention, the backwash water circuit is provided with a one-way valve which limits the flow from the pure water circuit to the raw water circuit, and the one-way valve is set with a pressure difference threshold. When the water pressure difference between the pure water circuit and the raw water circuit reaches the pressure difference threshold, the one-way valve opens, and when the water pressure difference between the pure water circuit and the raw water circuit does not reach the pressure difference threshold, the one-way valve closes.

[0016] As a further improvement of the present invention, the filtration 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.

[0017] As a further improvement of the present invention, the backwash water circuit connects the pure water pipeline and the raw water pipeline.

[0018] As a further improvement of the present invention, a central tube with a water hole is provided 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.

[0019] As a further improvement of the present invention, it also includes:

[0020] A pre-filter element, used for pre-filtering the raw water in the raw water pipe;

[0021] A pure water pipe, arranged in parallel with the backwash pipe, and used to output the pure water produced by the reverse osmosis filtration assembly;

[0022] The post-filter element is used for post-filtering the pure water in the pure water pipe, and delivering the pure water after post-filtration to the normal temperature water pipe and the water storage pipe.

[0023] As a further improvement of the present invention, the pre-filter element and the post-filter element are combined into a composite filter element.

[0024] Beneficial effects of the present invention:

[0025] A water storage tank is provided to store pure water, and the stored pure water has two functions: one is to output hot water as a source of hot water, and the other is to backwash the reverse osmosis filter element as a source of pure water when the reverse osmosis filter element needs to be purified. When backwashing is required, the pure water is returned to the reverse osmosis filter element through the backwashing pipe, and the pure water enters the pure water passage to increase the water pressure of the pure water passage. When the pressure difference threshold between the pure water passage and the raw water passage is reached, the one-way valve opens, so that the pure water flushes the reverse osmosis filter element. The overall structure is optimized through functional integration.

[0026] When the backwash water channel is connected, the pure water in the pure water channel is allowed to flow into the raw water channel through the backwash water channel, and flush the reverse osmosis filter element in the raw water channel. The flushing effect can flush and replace all the concentrated water in the reverse osmosis filter element, so that the reverse osmosis filter element does not contain larger molecules and particles such as solids, inorganic salts, organic matter, colloids, bacteria, viruses, etc., thereby greatly reducing the TDS value of the first glass of water when the user takes water. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings to help understand the purpose and advantages of the present invention, wherein:

[0028] Figure 1 is a schematic diagram of the reverse osmosis filtration component in implementation case 1;

[0029] Figure 2 It is a schematic diagram of the filter element seat in implementation case 1;

[0030] Figure 3 Schematic diagram of the purification system in implementation case 2. DETAILED DESCRIPTION

[0031] The present invention is further described in detail below based on the accompanying drawings and implementation examples.

[0032] The directional terms such as up, down, left, right, front, back, front, back, top, bottom, etc. mentioned or may be mentioned in this specification are defined relative to the structures shown in the drawings. The words "inside" and "outside" refer to the direction toward or away from the geometric center of a specific component, respectively. They are relative concepts, and therefore may change accordingly according to different locations and different usage conditions. Therefore, these or other directional terms should not be interpreted as restrictive terms.

[0033] A reverse osmosis filter assembly, referring to Figure 1 and Figure 2 , comprising a filter container 1, the filter container 1 having a raw water inlet h1, a pure water inlet h2 and a concentrated water inlet h3, and the filter container 1 having a raw water passage r1, a pure water passage r2 and a concentrated water passage r3. The raw water passage r1 is connected to the raw water inlet h1, raw water is input into the filter container 1 through the raw water inlet h1, and the raw water flows along the raw water passage r1, the pure water passage r2 is connected to the pure water inlet h2, 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 inlet h2, the concentrated water passage r3 is connected to the pure water inlet h2, 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 inlet h3.

[0034] The raw water passage r1 is provided with a reverse osmosis filter element 13, which is also called a RO reverse osmosis water purifier filter element. It utilizes the principle of reverse osmosis technology. When water passes through the 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 13 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 13 to generate pure water entering the pure water passage r2, and flows through the raw water passage r1 to generate concentrated water entering the concentrated water passage r3. In the filter container 1, the pure water passage r2 and the concentrated water passage r3 are equivalent to being connected in parallel with the raw water passage r1.

[0035] In this embodiment, the pure water passage r2 and the raw water passage r1 are connected with a backwash water passage r4, and the backwash water passage r4 is connected to the raw water passage r1 at the upstream of the reverse osmosis filter element 13. The backwash water passage r4 can be blocked or connected. When the backwash water passage r4 is blocked, the pure water flow of the pure water passage r2 and the raw water flow of the raw water passage r1 do not interfere with each other. When the backwash water passage r4 is connected, the pure water of the pure water passage r2 is allowed to flow into the raw water passage r1 through the backwash water passage r4, and the reverse osmosis filter element 13 of the raw water passage r1 is flushed. The flushing action can flush and replace all the concentrated water in the reverse osmosis filter element 13, so that the reverse osmosis filter element 13 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.

[0036] When backwashing is required, the backwashing waterway is connected, and the pure water in the pure water passage r2 flows into the raw water passage r1 upstream of the reverse osmosis filter element 13 through the backwashing waterway r4, so that the pure water can flow in from the water inlet end of the reverse osmosis filter element 13 and flow out from the water outlet end, so that the reverse osmosis filter element 13 can be fully covered and flushed, thereby improving the cleanliness of the flushing of the reverse osmosis filter element 13 and avoiding the residual macromolecules and particles in the reverse osmosis filter element 13. In addition, in the prior art, backwashing is performed by returning pure water to the reverse osmosis filter element 13. The reverse osmosis filter element 13 is structurally composed of multiple layers of reverse osmosis membranes. Whether it is raw water filtration or pure water reflux, water is achieved by permeating multiple layers of reverse osmosis membranes. During filtration, a large water pressure difference needs to be created to allow the raw water to penetrate these osmotic membranes, but it is difficult to provide a large water pressure difference during backwashing, so that the penetration degree of the pure water returning to the reverse osmosis filter element 13 is relatively low, and due to the high difficulty of penetration, a large amount of pure water needs to be consumed for reverse osmosis. In the present embodiment, since the pure water is not returned to the reverse osmosis filter element 13, but is introduced upstream of the reverse osmosis filter element 13 through the backwash water path r4, the pure water flushes the reverse osmosis filter element 13 along the original flow direction of the raw water, so that the flow resistance of the pure water for backwashing is greatly reduced compared with the prior art, which not only improves the flushing efficiency and can completely cover the reverse osmosis filter element 13 for flushing, but also greatly reduces the consumption of pure water compared with the prior art.

[0037] In this 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, and 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. Usually, when the raw water port h1 stops inputting raw water, the pure water port h2 stops outputting pure water, and the concentrated water port h3 continues to output 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 backwash state. It should be noted that, in the state of water storage, the pure water path r2 can not only reach the pressure difference threshold to open the one-way valve 16, but also provide sufficient pure water to flow into the raw water path r1 through the backwash water path r4 to flush the reverse osmosis filter element 13, thereby further optimizing the effect and efficiency of backwashing.

[0038] As for the specific structural composition of the filter container 1, in this embodiment, the filter container 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 13 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 h1, the pure water inlet h2 and the concentrated water inlet h3 are all arranged on the filter element seat 12. The filter element seat 12 is provided with a raw water pipe 121, a pure water pipe 122 and a concentrated water pipe 123. The raw water pipe 121 is connected to the raw water inlet h1 and constitutes a part of the raw water passage r1. The other part of the raw water passage r1 is located in the filter bottle 11; the pure water pipe 122 is connected to the pure water inlet h2 and constitutes a part of the pure water passage r2. The other part of the pure water passage r2 is located in the filter bottle 11; the concentrated water pipe 123 is connected to the concentrated water inlet h3 and constitutes a part of the concentrated water passage r3. The other part of the concentrated water passage r3 is located in the filter bottle 11.

[0039] In this embodiment, the backwash water circuit r4 is arranged in the filter element seat 12 and connects the pure water pipe 122 and the raw water pipe 121, and the reverse osmosis filter element 13 is arranged in the filter bottle 11, so that the pure water in the backwash water circuit r4 flows into the upstream of the reverse osmosis filter element 13, so that the pure water can flush the reverse osmosis filter element 13.

[0040] In this embodiment, a central tube 14 is provided in the filter bottle 11, and the central tube 14 is located at the center of the filter bottle 11. The tube wall of the central tube 14 has a plurality of water holes 141, which can allow water to flow from the periphery of the central tube 14 into the central tube 14 through the water holes 141. The central tube 14 constitutes another part of the pure water passage r2 and is connected to the pure water pipeline 122. Therefore, the central tube 14 and the pure water pipeline 122 constitute a complete pure water passage r2. The reverse osmosis filter element 13 is annularly sleeved outside the central tube 14. The reverse osmosis filter element 13 constitutes another part of the raw water passage r1 and is connected to the raw water pipeline 121. Therefore, the reverse osmosis filter element 13 and the raw water pipeline 121 constitute a complete raw water passage r1. There is a gap 15 between the reverse osmosis filter element 13 and the inner wall of the filter bottle 11. The gap 15 is annular and constitutes another part of the concentrated water passage r3, and is connected to the concentrated water pipeline 123. Therefore, the annular gap 15 and the concentrated water pipeline 123 constitute a complete concentrated water passage r3.

[0041] In this embodiment, more specifically, the filter element seat 12 is arranged at the top of the filter bottle 11, and the central tube 14 is arranged vertically. The raw water enters from the raw water port h1 and flows downward along the raw water pipe 121 into the reverse osmosis filter element 13. A part of the raw water is reverse osmosis inward in the reverse osmosis filter element 13, and the pure water that has completed the reverse osmosis flows into the central tube 14 through the water hole 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 port h2. Another part of the raw water in the reverse osmosis filter element 13 forms concentrated water after flowing through the reverse osmosis filter element 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 port h3.

[0042] Implementation Case 2:

[0043] A water purification system, referring to Figure 3 Combined with Figure 1 and Figure 2, including a reverse osmosis filtration component 1, a raw water pipe t1, a concentrated water pipe t2, a normal temperature water pipe t3, a water storage pipe t4, a hot water pipe t5 and a backwash pipe t6. Among them, the reverse osmosis filtration component 1 is as shown in the implementation case 1, the raw water pipe t1 is used to input raw water into the reverse osmosis filtration component 1; the raw water pipe t1 is provided with a raw water inlet valve v1 to control the output of raw water, and the raw water pipe t1 is provided with a booster pump p1 to increase the pressure and increase the flow rate; the concentrated water pipe t2 is used to discharge the concentrated water output by the reverse osmosis filtration component 1, and the concentrated water pipe t2 is provided with a concentrated water outlet valve v2 to control the output of concentrated water; the normal temperature water pipe t3 and the water storage pipe t4 are arranged in parallel to discharge the pure water output by the reverse osmosis filtration component 1; the normal temperature water pipe t3 is provided with a A normal temperature water outlet valve v3 is provided to control the output of pure water at normal temperature; a water storage valve v4 is provided on the water storage pipe t4 to control the output of pure water, and a water storage tank m is provided on the water storage pipe t4 to store pure water; the pure water output of the water storage tank m is controlled by the flow control pump p2, and pure water is provided to the hot water pipe t5 and the backwashing pipe t6; the hot water pipe t5 is provided with a heating pipe c and a hot water valve v6, and the pure water in the hot water pipe t5 is output as hot water after being heated by the heating pipe c; the backwashing pipe t6 is provided with a pure water reflux valve v5, and is used to input pure water into the reverse osmosis filtration component 1 to flush the reverse osmosis filter element.

[0044] In this embodiment, a water storage tank m is provided to store pure water, and the stored pure water has two functions: one is to output hot water as a source of hot water, and the other is to backwash as a source of pure water when the reverse osmosis filter assembly 1 needs to be purified. When backwashing is required, the pure water is returned to the reverse osmosis filter assembly 1 through the backwashing pipe t6, and the pure water enters the pure water passage to increase the water pressure of the pure water passage. When the pure water passage and the raw water passage reach the pressure difference threshold, the one-way valve opens, so that the pure water flushes the reverse osmosis filter element.

[0045] The water purification system of this embodiment also includes a pre-filter element f1, a post-filter element f2 and a pure water pipe t7. The pre-filter element f1 is arranged on the raw water pipe t1, and is used to pre-filter the raw water in the raw water pipe t1, and the raw water after pre-filtration is then transported to the reverse osmosis filtration component 1 for filtration; the pure water pipe t7 connects the reverse osmosis filtration component 1 and the post-filter element f2, and the pure water pipe t7 transports the pure water output by the reverse osmosis filtration component 1 to the post-filter element f2, and the post-filter element f2 performs post-filtration on the pure water, and the normal temperature water pipe t3 and the water storage pipe t4 are connected in parallel to the post-filter element f2.

[0046] This embodiment can remove larger impurities in the water, such as sand, rust, algae and other particulate matter visible to the naked eye, by setting a pre-filter element f1. 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 f2 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 f2 can also remove discoloration and odor in the water, making the purified water clearer and tastier.

[0047] In this embodiment, the pre-filter element f1 and the post-filter element f2 are combined into a composite filter element f. Combining the two into a composite filter element f can simplify the overall structural setting, simplify the pipeline layout and optimize the space required for the water purification system.

[0048] In this embodiment, the water tank m is connected to a drain pipe t8, and the hot water pipe t5 and the backwash pipe t6 are connected in parallel to the drain pipe t8. The drain pipe t8 is provided with a flow control pump p2 and a flow meter d. The flow meter d can accurately control the output of hot water and the amount of pure water required for backwashing.

[0049] In this implementation case, the water tank m is provided with a water level monitoring mechanism (not shown in the figure) for detecting the amount of pure water stored in the water tank m. When the water level in the water tank reaches the minimum threshold, the water storage mode is turned on to store water. When the water level in the water tank reaches the maximum threshold, the backwash mode is turned on. The user also turns on the backwash mode after stopping taking normal temperature water to ensure the TDS value of the first cup of water.

[0050] Finally, it should be noted that the above implementation cases are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned implementation cases, those skilled in the art should understand that they can still modify the technical solutions recorded in the aforementioned implementation cases, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the implementation cases of the present invention.

Claims

1. A water purification system, characterized in that: include: A reverse osmosis filtration component is provided with a reverse osmosis filter element inside; A raw water pipe, used to input raw water into the reverse osmosis filtration assembly, wherein the raw water pipe is provided with a raw water inlet valve and a booster pump; A concentrated water pipe, used for discharging concentrated water outputted by the reverse osmosis filtration assembly, wherein the concentrated water pipe is provided with a concentrated water outlet valve; A normal temperature water pipe and a water storage pipe are arranged in parallel, and are used to discharge the pure water output by the reverse osmosis filtration assembly; the normal temperature water pipe is provided with a normal temperature water outlet valve; the water storage pipe is provided with a water storage valve and a water storage tank, and the water storage tank is used to store the pure water output by the reverse osmosis filtration assembly, and the output of the pure water is controlled by a flow control pump and provides pure water to the hot water pipe and the backwash pipe; The hot water pipe is provided with a heating pipe and a hot water valve and is used for discharging hot water; the backwash pipe is provided with a pure water reflux valve and is used for inputting pure water into the reverse osmosis filtration component to flush the reverse osmosis filter element.

2. The water purification system according to claim 1, characterized in that: The reverse osmosis filtration component is provided with a raw water passage for receiving raw water input from the raw water pipe, the pure water passage for outputting pure water to the normal temperature water pipe and the water storage tank and receiving pure water input from the backwash pipe, and a concentrated water passage for outputting concentrated water to the concentrated water pipe; the reverse osmosis filter element is arranged in the raw water passage, so that raw water in the reverse osmosis filter element is generated through reverse osmosis flow to the pure water passage, and concentrated water is generated through raw water flow to the concentrated water passage.

3. The water purification system according to claim 2, characterized in that: The pure water passage and the raw water passage are connected with a backwash water passage that can be blocked or connected. The backwash water passage is used to connect when the backwash pipe inputs pure water to the reverse osmosis filtration component, allowing the pure water in the pure water passage to flow into the raw water passage and flush the reverse osmosis filter element.

4. The water purification system according to claim 3, characterized in that: The backwash water channel is connected to the raw water channel at a position upstream of the reverse osmosis filter element.

5. The water purification system according to claim 4, characterized in that: The backwash water circuit is provided with a one-way valve which limits the flow from the pure water circuit to the raw water circuit. The one-way valve is set with a pressure difference threshold. When the water pressure difference between the pure water circuit and the raw water circuit reaches the pressure difference threshold, the one-way valve opens; when the water pressure difference between the pure water circuit and the raw water circuit does not reach the pressure difference threshold, the one-way valve closes.

6. The water purification system according to claim 4, characterized in that: 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.

7. The water purification system according to claim 5, characterized in that: The backwash water channel connects the pure water pipeline and the raw water pipeline.

8. The water purification system according to claim 5, characterized in that: 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.

9. The water purification system according to any one of claims 1 to 8, characterized in that: Also includes: A pre-filter element, used for pre-filtering the raw water in the raw water pipe; A pure water pipe, arranged in parallel with the backwash pipe, and used to output the pure water produced by the reverse osmosis filtration assembly; The post-filter element is used for post-filtering the pure water in the pure water pipe, and delivering the pure water after post-filtration to the normal temperature water pipe and the water storage pipe.

10. The water purification system according to claim 9, characterized in that: The front filter element and the rear filter element are combined into a composite filter element.

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