Water purifier

Abstract

The water purifier comprises a machine body shell, a filter unit and a pure water backflow unit, the filter unit is arranged in the machine body shell, and the filter unit comprises a raw water inlet, a pure water outlet and a reverse osmosis filter element arranged on a fluid path from the raw water inlet to the pure water outlet; the pure water backflow unit is detachably installed on the outer side of the machine body shell and comprises a pure water backflow pipeline, one end of the pure water backflow pipeline is communicated with the pure water outlet, and the other end of the pure water backflow pipeline is communicated with the raw water inlet; and pure water discharged by the filter unit can flow back into the reverse osmosis filter element through the pure water backflow pipeline, so that a reverse osmosis membrane of the reverse osmosis filter element is flushed. According to the water purifier, on the basis that the reverse osmosis membrane is backwashed by pure water, an internal water path is simplified, the miniaturization of the whole machine is facilitated, water path interfaces are reduced, the risk of water leakage to electronic elements is reduced, and the use safety is improved.

Description

Technical Field

[0001] This application relates to the field of water purifier technology, specifically to a water purifier. Background Technology

[0002] As consumers place increasing emphasis on healthy drinking water and have higher requirements for water quality, water purifiers are gaining wider acceptance and popularity. The core component of a water purifier is the filter cartridge. Different filter cartridges can perform different levels of filtration on raw water. Most high-performance water purifiers are equipped with RO filters (also known as reverse osmosis filters) or composite filters containing RO filters that can filter raw water into pure water.

[0003] An RO filter typically consists of a central tube and an RO membrane wrapped around it. When the water purifier is left to stand, water molecules, inorganic salts, heavy metal ions, and other substances exchange across the RO membrane through diffusion. This results in the TDS concentration on both sides of the RO membrane gradually converging. Therefore, when the water purifier is restarted after a period of settling, the initial flow of water may have a higher TDS, making the first few glasses of water unsuitable for direct consumption due to the high TDS, leading to a poor user experience. This situation is particularly common in high-salinity areas, where the high salt content in the water significantly impacts the RO filter, easily causing membrane clogging and reducing its lifespan.

[0004] To address the aforementioned issues, some existing water purifiers feature a raw water flushing function. The specific operation involves opening the inlet and wastewater valves connected to the RO filter cartridge after water purification, flushing the RO membrane with tap water. This replaces the high-concentration wastewater on the RO membrane surface with tap water, and the flushing water is discharged through the wastewater valve, thus reducing the risk of RO membrane clogging. However, a short flushing time results in poor flushing effectiveness, while extending the flushing time improves the effect but consumes a large amount of water, leading to water waste. Some existing water purifiers have an internal raw water and pure water mixing flushing circuit. Specifically, a pure water return pipe is installed at the pure water outlet of the filter cartridge, connecting to the RO filter cartridge. After the water purifier finishes producing water, the inlet valve and wastewater valve connected to the RO filter cartridge are opened respectively. The water purifier continues to work for a period of time, allowing the filtered pure water to flow back to the RO filter cartridge. At the same time, raw water also enters the RO filter cartridge. The raw water and pure water mix and flush the RO membrane before being discharged through the wastewater valve, thereby reducing the risk of RO membrane clogging and achieving a good flushing effect in a shorter flushing time. However, this method still has some problems. For example, adding a pure water return flushing circuit within the limited space inside the water purifier makes the already complex internal water circuit even more complicated, which is not conducive to the miniaturization of the whole machine. The increase in water circuit interfaces also increases the risk of water leakage to internal electronic components.

[0005] In addition, for consumers who have already chosen traditional water purifiers without flushing function, considering the high cost of replacing filters and the cost of replacing the entire unit, they hope to improve the problem of RO filter cartridges not being able to be flushed in a simple and low-cost way based on existing conditions. Utility Model Content

[0006] This application provides a water purifier that selectively adds a pure water reflux unit to the outside of the casing to improve or solve the technical problem of the low service life of the RO filter element caused by the lack of a flushing function in traditional water purifiers.

[0007] The technical solution adopted in this application is as follows:

[0008] A water purifier includes a housing, a filter unit, and a pure water return unit. The filter unit is located inside the housing and includes a raw water inlet, a pure water outlet, and a reverse osmosis filter element disposed on the fluid path from the raw water inlet to the pure water outlet. The pure water return unit is detachably installed on the outside of the housing and includes a pure water return pipeline. One end of the pure water return pipeline is connected to the pure water outlet, and the other end is connected to the raw water inlet, so that the pure water discharged from the filter unit can return to the reverse osmosis filter element through the pure water return pipeline to flush the reverse osmosis membrane of the reverse osmosis filter element.

[0009] The water purifier provided in this application also includes the following additional technical features:

[0010] The pure water return pipeline includes a raw water inlet pipe and a pure water outlet pipe. The outlet end of the raw water inlet pipe is inserted into the raw water inlet, and the inlet end of the pure water outlet pipe is inserted into the pure water outlet. The outlet end of the pure water outlet pipe and the inlet end of the raw water inlet pipe are connected on the outside of the outer casing of the machine body.

[0011] The pure water return pipeline includes a first tee connector, the three ports of which are respectively used to connect the inlet end of the raw water inlet pipe, the outlet end of the pure water outlet pipe, and the external raw water supply structure.

[0012] The pure water return pipeline includes a second three-way connector, the three ports of which are respectively used to connect the outlet end of the pure water outlet pipe, the first three-way connector, and the water faucet of the water purifier.

[0013] The raw water inlet pipe and the pure water outlet pipe are arranged in parallel. The pure water return pipe includes an L-shaped water connector. The two ends of the L-shaped water connector are respectively connected to the first tee connector and the second tee connector, so that the outlet end of the pure water outlet pipe is connected to the inlet end of the raw water inlet pipe in sequence through the second tee connector, the L-shaped water connector and the first tee connector.

[0014] The pure water reflux unit includes a first check valve located on the fluid path of the pure water reflux pipeline.

[0015] The pure water return unit includes a solenoid valve and a pressure tank located on the fluid path of the pure water return pipeline, so that the pure water discharged by the filtration unit can be stored in the pressure tank in advance and transported to the raw water inlet through the pressure tank.

[0016] The filtration unit further includes a first filter element and a second filter element. The first filter element is connected to the fluid path from the raw water inlet to the reverse osmosis filter element, and the second filter element is connected to the fluid path from the reverse osmosis filter element to the pure water outlet.

[0017] An inlet control valve and a booster pump are sequentially connected in the fluid path from the first filter element to the reverse osmosis filter element, and an outlet control valve is connected in the fluid path of the wastewater discharge channel of the reverse osmosis filter element.

[0018] A second check valve, a high-pressure switch, and a TDS detector are sequentially connected along the fluid path from the second filter element to the pure water outlet.

[0019] Due to the adoption of the above technical solution, the technical effects achieved by this application include at least the following:

[0020] 1. The water purifier provided in this application, firstly, by setting up a pure water return unit, which includes a pure water return pipeline, one end of which is connected to a pure water outlet and the other end to a raw water inlet, allows the pure water discharged from the filtration unit to flow back into the reverse osmosis filter element through the pure water return pipeline, thereby flushing the reverse osmosis membrane of the reverse osmosis filter element. Furthermore, it can not only flush the reverse osmosis membrane with pure water, but also simultaneously control the entry of tap water into the raw water inlet, thus allowing the mixture of raw water and pure water to flush the reverse osmosis membrane, reducing the ion concentration on the membrane surface, thereby improving the lifespan of the reverse osmosis membrane, and ensuring that the pure water used by the user is always in a state of low TDS value and directly drinkable, guaranteeing the user's drinking water health and improving the user experience; secondly, the pure water return unit in this application is detachably installed on the outside of the machine casing, allowing users to selectively install a pure water return unit according to water quality. For users who already use water purifiers without a flushing function, an external pure water return unit can also be added to give the water purifier a flushing function. In addition, the pure water recirculation unit does not occupy the internal space of the machine casing. While enabling the pure water backwashing of the reverse osmosis membrane, it also helps to simplify the internal water circuit of the water purifier, which is conducive to the miniaturization of the whole machine. It reduces the number of internal water circuit interfaces, reduces the risk of water leakage to internal electronic components, and improves the safety of use.

[0021] 2. As a preferred method, the pure water return pipeline is equipped with a raw water inlet pipe and a pure water outlet pipe. The outlet end of the raw water inlet pipe is inserted into the raw water inlet, and the inlet end of the pure water outlet pipe is inserted into the pure water outlet. This makes the pure water return pipeline detachable, improves the convenience of connecting the pure water return pipeline to the outside of the machine casing, and also facilitates the maintenance of the pure water return unit.

[0022] 3. As a preferred method, the pure water return pipeline is equipped with a first tee connector, which facilitates the connection of the external raw water supply structure to the raw water inlet pipe, and also provides an extra interface for connecting the pure water outlet pipe; by setting a second tee connector, the pure water outlet pipe is conveniently connected to the water purifier's faucet, and also provides an extra interface for connecting the raw water inlet pipe through the first tee connector.

[0023] 4. As a preferred method, a first one-way valve is installed on the fluid path of the pure water return pipeline, so that the pure water outlet is unidirectionally connected to the raw water inlet through the pure water return pipeline, thereby preventing the raw water from flowing back into the pure water outlet pipe through the pure water return pipeline when the raw water enters, which would affect the quality of the pure water output. Attached Figure Description

[0024] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0025] Figure 1 The assembly drawing of the water purifier provided in this application shows the pure water return pipeline installed on the outside of the casing.

[0026] Figure 2 for Figure 1 Enlarged view of point A in the middle;

[0027] Figure 3 A water circuit diagram for a first embodiment of the water purifier provided in this application, with arrows indicating the direction of water flow;

[0028] Figure 4 A water circuit diagram for a first embodiment of the water purifier provided in this application, with arrows indicating the direction of water flow;

[0029] Figure 5 The assembly drawing of the water purifier provided in this application shows that the pure water return pipe is not installed on the outside of the casing.

[0030] Figure 6 This is a schematic diagram of the pure water return pipeline provided in this application.

[0031] List of components and reference numerals:

[0032] 10. Casing; 11. Raw water inlet; 12. Pure water outlet; 13. Reverse osmosis filter element; 14. Pure water return pipeline; 15. Raw water inlet pipe; 16. Pure water outlet pipe; 17. First tee connector; 18. Second tee connector; 19. L-type water connector; 20. First check valve; 21. Solenoid valve; 22. Pressure tank; 23. First filter element; 24. Second filter element; 25. Inlet control valve; 26. Booster pump; 27. Outlet control valve; 28. Second check valve; 29. ​​High-pressure switch; 30. TDS detection element; 31. Wastewater outlet pipe; 32. Wastewater outlet. Detailed Implementation

[0033] To more clearly illustrate the overall concept of this application, a detailed explanation is provided below with reference to the accompanying drawings.

[0034] Many specific details are set forth in the following description in order to provide a full understanding of this application. However, this application may also be implemented in other ways different from those described herein. Therefore, the scope of protection of this application is not limited to the specific embodiments disclosed below.

[0035] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0036] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0037] In the embodiments of this application, a water purifier is provided. For ease of explanation and understanding, the following content provided in this application is based on the illustrated product structure. Of course, those skilled in the art will understand that the above structure is only a specific example and illustrative illustration, and does not constitute a specific limitation on the technical solution provided in this application.

[0038] like Figures 1 to 6As shown, the water purifier provided in this application includes a housing 10, a filter unit, and a pure water return unit. The filter unit is located inside the housing 10 and includes a raw water inlet 11, a pure water outlet 12, and a reverse osmosis filter element 13 disposed on the fluid path from the raw water inlet 11 to the pure water outlet 12. The pure water return unit is detachably installed on the outside of the housing 10 and includes a pure water return pipe 14. One end of the pure water return pipe 14 is connected to the pure water outlet 12, and the other end is connected to the raw water inlet 11, so that the pure water discharged by the filter unit can return to the reverse osmosis filter element 13 through the pure water return pipe 14 to flush the reverse osmosis membrane of the reverse osmosis filter element 13.

[0039] Specifically, such as Figure 3 The diagram shown is a water circuit diagram of the water purifier provided in this application. Raw water enters through the raw water inlet 11 and is filtered into pure water by the filtration unit. This pure water can be delivered to the water outlet of the purifier and can also be returned through the pure water return pipe 14 for backwashing. Therefore, the water purifier of this application, firstly, by setting up a pure water return unit, including a pure water return pipe 14, with one end connected to the pure water outlet 12 and the other end connected to the raw water inlet 11, allows the pure water discharged from the filtration unit to return to the reverse osmosis filter element 13 through the pure water return pipe 14, thereby flushing the reverse osmosis membrane of the reverse osmosis filter element 13. Furthermore, not only can the reverse osmosis membrane be flushed with pure water, but tap water can also be simultaneously controlled to enter the raw water inlet 11, thus allowing the raw water and pure water mixture to flush the reverse osmosis membrane. The reverse osmosis membrane is flushed, reducing the ion concentration on the membrane surface, thereby extending the membrane's lifespan and ensuring that the purified water used by the user remains at a low TDS value, making it safe for direct consumption and guaranteeing the user's drinking water health, thus improving the user experience. Secondly, the purified water recirculation unit in this application is detachably installed on the outside of the casing 10, allowing users to selectively add a unit based on water quality. For users already using water purifiers without a flushing function, an external purified water recirculation unit can provide this function. Furthermore, the purified water recirculation unit does not occupy internal space within the casing 10. In addition to enabling purified water backwashing of the reverse osmosis membrane, it also helps simplify the internal water circuit of the water purifier, facilitating overall miniaturization, reducing the number of internal water circuit interfaces, lowering the risk of leakage to internal electronic components, and improving safety.

[0040] As a preferred embodiment of this application, such as Figure 1 and Figure 2As shown, the pure water return pipeline includes a raw water inlet pipe 15 and a pure water outlet pipe 16. The outlet end of the raw water inlet pipe 15 is inserted into the raw water inlet 11, and the inlet end of the pure water outlet pipe 16 is inserted into the pure water outlet 12. The outlet end of the pure water outlet pipe 16 and the inlet end of the raw water inlet pipe 15 are connected on the outside of the casing 10. Those skilled in the art will understand that by setting up the raw water inlet pipe 15 and the pure water outlet pipe 16, with the raw water inlet pipe 15 connected to the raw water inlet 11 and the pure water outlet pipe 16 connected to the pure water outlet 12, the pure water return pipeline is detachable, improving the convenience of connecting the pure water return pipeline 14 to the outside of the casing 10 and facilitating maintenance of the pure water return unit.

[0041] In a preferred embodiment, such as Figure 2 and Figure 5 As shown, the wastewater outlet 32 ​​of the reverse osmosis filter element 13 can be connected to a wastewater outlet pipe 31. The wastewater outlet pipe 31 extends outside the housing 10 to facilitate the discharge of wastewater to the outside of the housing 10. For example, the wastewater can be directly discharged into the municipal sewer.

[0042] In a preferred embodiment, such as Figure 2 and Figure 6 As shown, the pure water return pipeline includes a first three-way connector 17, whose three ports are respectively used to connect the inlet end of the raw water inlet pipe 15, the outlet end of the pure water outlet pipe 16, and an external raw water supply structure (such as a tap). Further, the water purifier includes a second three-way connector 18, whose three ports are respectively used to connect the outlet end of the pure water outlet pipe 16, the first three-way connector 17, and the water purifier's tap. Those skilled in the art will understand that by providing the first three-way connector 17, it is convenient for the external raw water supply structure to connect to the raw water inlet pipe 15, and it also provides an extra port for connecting to the pure water outlet pipe 16; by providing the second three-way connector 18, it is convenient for the pure water outlet pipe 16 to connect to the water purifier's tap, and it also provides an extra port for connecting to the raw water inlet pipe 15 via the first three-way connector 17.

[0043] Furthermore, such as Figure 2 and Figure 6 As shown, the raw water inlet pipe 15 and the pure water outlet pipe 16 are arranged in parallel. The pure water return pipe 14 includes an L-shaped water connector 19. The two ends of the L-shaped water connector 19 are respectively connected to the first tee connector 17 and the second tee connector 18, so that the outlet end of the pure water outlet pipe 16 is connected to the inlet end of the raw water inlet pipe 15 through the second tee connector 18, the L-shaped water connector 19 and the first tee connector 17 in sequence. Figure 2 The diagram schematically illustrates an embodiment where the raw water inlet pipe 15 is positioned parallel to and directly above the pure water outlet pipe 16. The interface of the first tee connector 17, used to connect to the pure water outlet pipe 16, faces downwards. The interface of the second tee connector 18, used to connect to the first tee connector 17, is oriented in the same direction as the pure water outlet pipe 16, thus facilitating the connection of the L-shaped water connector 19. The pure water return pipeline 14 is composed of the raw water inlet pipe 15, the pure water outlet pipe 16, the first tee connector 17, the second tee connector 18, and the L-shaped water connector 19. It has a simple structure, occupies little external space, and is easy to install.

[0044] As a preferred embodiment of this application, such as Figure 3 As shown, the pure water reflux unit includes a first check valve 20 located on the fluid path of the pure water reflux pipeline 14, allowing the pure water outlet 12 to unidirectionally flow through the pure water reflux pipeline 14 to the raw water inlet 11, preventing raw water from flowing back into the pure water outlet pipe 16 through the pure water reflux pipeline 14 and affecting the quality of the pure water output. Specifically, in the embodiment where the aforementioned pure water reflux pipeline 14 includes an L-shaped water connector 19, the first check valve 20 can be located inside the L-shaped water connector 19.

[0045] As an alternative implementation method, such as Figure 4 As shown, the pure water recirculation unit includes a solenoid valve 21 and a pressure tank 22 located on the fluid path of the pure water recirculation pipeline 14. This allows the pure water discharged from the filtration unit to be pre-stored in the pressure tank 22 and then supplied to the raw water inlet 11 via the pressure tank 22. Specifically, regarding the pure water recirculation method of this solution, after the entire water purifier completes its operation, the water purifier can continue to work for a period of time. The pure water discharged from the filtration unit enters the pressure tank 22. The effective water storage capacity of the pressure tank 22 is greater than the external membrane capacity of the reverse osmosis filter element 13. When the pressure tank 22 is full, the water purifier stops, the solenoid valve 21 opens, and the pure water in the pressure tank 22 flows back to the reverse osmosis filter element 13, mixing with the raw water to flush the surface of the reverse osmosis membrane, achieving pure water flushing, reducing the ion concentration on the surface of the reverse osmosis membrane, and extending its lifespan.

[0046] Regarding the structure of the filtration unit, it may include not only the reverse osmosis filter element 13, but also, in a preferred embodiment, such as... Figure 3 and Figure 4As shown, the filtration unit further includes a first filter element 23 and a second filter element 24. The first filter element 23 is connected to the fluid path from the raw water inlet 11 to the reverse osmosis filter element 13, and the second filter element 24 is connected to the fluid path from the reverse osmosis filter element 13 to the pure water outlet 12. In this embodiment, the first filter element 23, the reverse osmosis filter element 13, and the second filter element 24 constitute a series filtration structure. The raw water undergoes multiple filtrations through the first filter element 23, the reverse osmosis filter element 13, and the second filter element 24, significantly improving the filtration effect. The structure of the first filter element 23 and the second filter element 24 is not limited; for example, carbon fiber filter elements, activated carbon filter elements, PP cotton filter elements, etc., can be selected.

[0047] In a preferred embodiment, such as Figure 3 and Figure 4 As shown, an inlet control valve 25 and a booster pump 26 are sequentially connected to the fluid path from the first filter element 23 to the reverse osmosis filter element 13, and an outlet control valve 27 is connected to the fluid path of the wastewater discharge path of the reverse osmosis filter element 13. The inlet control valve 25 controls the flow of water from the first filter element 23 to the reverse osmosis filter element 13. The booster pump 26 pressurizes the water passing through the inlet control valve 25 and delivers it to the reverse osmosis filter element 13, thereby improving the filtration efficiency. The outlet control valve 27 controls the discharge of wastewater from the reverse osmosis filter element 13. When the reverse osmosis membrane is flushed by raw water and pure water, the outlet control valve 27 opens, allowing the flushed water to be discharged through the outlet control valve 27.

[0048] In a preferred embodiment, such as Figure 3 and Figure 4 As shown, a second one-way valve 28, a high-pressure switch 29, and a TDS detector 30 are sequentially connected along the fluid path from the second filter element 24 to the pure water outlet 12. The second one-way valve 28 ensures one-way flow from the second filter element 24 to the pure water outlet 12, preventing backflow. The high-pressure switch 29 protects and controls the water pressure. Especially in the aforementioned pure water return unit including a pressure tank 22, when the pressure tank 22 is full and reaches a certain pressure value, the high-pressure switch 29 closes, cutting off the power and terminating the water purifier's operation. When the water in the pressure tank 22 decreases, the pressure drops, the high-pressure switch 29 opens, and the water purifier starts. The TDS detector 30 can detect and monitor the TDS value in the pure water discharged from the filtration unit.

[0049] For any parts not mentioned in this application, existing technologies may be used or referenced.

[0050] The various embodiments in this specification are described in a progressive manner. The same or similar parts between the various embodiments can be referred to each other. Each embodiment focuses on describing the differences from other embodiments.

[0051] The above description is merely an embodiment of this application and is not intended to limit the scope of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of the claims of this application.

Claims

1. A water purifier, characterized in that, include: fuselage casing; A filtration unit is located inside the housing of the machine body. The filtration unit includes a raw water inlet, a pure water outlet, and a reverse osmosis filter element located in the fluid path from the raw water inlet to the pure water outlet. A pure water recirculation unit is detachably installed on the outside of the housing. The pure water recirculation unit includes a pure water recirculation pipeline. One end of the pure water recirculation pipeline is connected to the pure water outlet, and the other end is connected to the raw water inlet, so that the pure water discharged from the filtration unit can flow back into the reverse osmosis filter element through the pure water recirculation pipeline to flush the reverse osmosis membrane of the reverse osmosis filter element.

2. The water purifier according to claim 1, characterized in that, The pure water return pipeline includes a raw water inlet pipe and a pure water outlet pipe. The outlet end of the raw water inlet pipe is inserted into the raw water inlet, and the inlet end of the pure water outlet pipe is inserted into the pure water outlet. The outlet end of the pure water outlet pipe and the inlet end of the raw water inlet pipe are connected on the outside of the outer casing of the machine body.

3. The water purifier according to claim 2, characterized in that, The pure water return pipeline includes a first tee connector, the three ports of which are respectively used to connect the inlet end of the raw water inlet pipe, the outlet end of the pure water outlet pipe, and the external raw water supply structure.

4. The water purifier according to claim 3, characterized in that, The pure water return pipeline includes a second three-way connector, the three ports of which are respectively used to connect the outlet end of the pure water outlet pipe, the first three-way connector, and the water faucet of the water purifier.

5. The water purifier according to claim 4, characterized in that, The raw water inlet pipe and the pure water outlet pipe are arranged in parallel. The pure water return pipe includes an L-shaped water connector. The two ends of the L-shaped water connector are respectively connected to the first tee connector and the second tee connector, so that the outlet end of the pure water outlet pipe is connected to the inlet end of the raw water inlet pipe in sequence through the second tee connector, the L-shaped water connector and the first tee connector.

6. The water purifier according to claim 1, characterized in that, The pure water reflux unit includes a first check valve located on the fluid path of the pure water reflux pipeline.

7. The water purifier according to claim 1, characterized in that, The pure water return unit includes a solenoid valve and a pressure tank located on the fluid path of the pure water return pipeline, so that the pure water discharged by the filtration unit can be stored in the pressure tank in advance and transported to the raw water inlet through the pressure tank.

8. The water purifier according to any one of claims 1-7, characterized in that, The filtration unit further includes a first filter element and a second filter element. The first filter element is connected to the fluid path from the raw water inlet to the reverse osmosis filter element, and the second filter element is connected to the fluid path from the reverse osmosis filter element to the pure water outlet.

9. The water purifier according to claim 8, characterized in that, An inlet control valve and a booster pump are sequentially connected in the fluid path from the first filter element to the reverse osmosis filter element, and an outlet control valve is connected in the fluid path of the wastewater discharge channel of the reverse osmosis filter element.

10. The water purifier according to claim 8, characterized in that, A second check valve, a high-pressure switch, and a TDS detector are sequentially connected along the fluid path from the second filter element to the pure water outlet.

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