Water purification waterway system and water purification device

Abstract

The utility model discloses a water purification waterway system and a water purification device, and belongs to the technical field of water purification. The water purifier comprises a purified water path, a first water outlet path and a first water return path, the water inlet end of the first water outlet path is communicated with the purified water outlet end of the purified water path, and the water outlet end of the first water outlet path is provided with a water outlet faucet; an adjustable electromagnetic valve is arranged between the water inlet end of the first water outlet path and the water outlet faucet; the water inlet end of the first water return waterway is communicated with the pure water outlet end of the pure water waterway and is arranged at the front end of the adjustable electromagnetic valve; the water outlet end of the first water return way is connected with the front end of a water pump in the purified water way, purified water flowing out of the purified water outlet end can flow back to the purified water way through the first water return way, and a backflow electromagnetic valve is arranged on the first water return way. The water purification device can ensure the quality of discharged water, a user can select the flow of the discharged water according to own requirements, and the water purification device is rich in function and more practical.

Description

Technical Field

[0001] This utility model relates to the field of water purification technology, and in particular to a water purification system and a water purification device. Background Technology

[0002] As people's demands for the health and safety of drinking water increase, the quality of drinking water has become a major concern. Water purifiers are becoming increasingly popular because they can process raw water through filters to remove various pollutants, producing pure water that is fresher, more hygienic, and safer.

[0003] Current water purification devices primarily determine water demand by detecting the water pressure in the purified water outlet pipe. When a decrease in pressure is detected, water demand is indicated, and the device needs to be activated. However, the flow rate of these devices is often fixed. When a user requires a smaller flow rate, the fixed upstream water production capacity prevents timely adjustment of the outlet flow. Forcibly reducing the flow at the faucet can lead to increased pipe pressure due to the retained water, posing a safety hazard. This inability to easily switch from high to low flow rates causes inconvenience for users.

[0004] TDS (Total Dissolved Solids) is a key indicator of a water purifier's filtration efficiency. A water purifier can achieve a TDS removal rate of over 90% when operating continuously under normal conditions. However, if the water purifier is stopped for a period of time before resuming operation, the TDS of the first cup of water produced will be relatively high, and the longer the stoppage time, the higher the TDS will be.

[0005] A search revealed patent number CN207551968U, which discloses a water purification system. This system connects the pure water pipe and the raw water pipe via a return pipe. When the water purification system finishes producing water, the water dispensing switch on the pure water pipe is closed. At this time, the system's controller keeps the booster pump running, ensuring that the pure water produced by the membrane filter can only flow back to the raw water pipe through the pure water pipe and the return pipe. This pure water then flows into the membrane filter along with the raw water in the original pipe, performing an initial rinse. Ultimately, the membrane filter contains only a mixture of raw water and pure water. This ensures that even if the system restarts to produce pure water after a long period, the TDS value of the first cup of pure water produced will still meet the user's needs. However, this application only addresses the issue of a high TDS value in the first cup of water; it does not adequately solve the user's need for flow regulation at the point of use. Utility Model Content

[0006] 1. Technical problem to be solved by the utility model

[0007] In view of the shortcomings of the prior art, the present invention provides a water purification system and a water purification device. The present invention not only solves the problem of unsafe water quality after the water purification device has not been used for a long time, but also realizes the function of adjusting the flow rate at the water end, so that users can select the water flow rate according to their own needs.

[0008] 2. Technical Solution

[0009] To achieve the above objectives, the technical solution provided by this utility model is as follows:

[0010] In a first aspect, this utility model provides a water purification system, including a water purification system having a raw water inlet and a pure water outlet; a water pump and a filter element are installed on the water purification system, the inlet of the water pump is connected to the raw water inlet, the outlet of the water pump is connected to the inlet of the filter element, the outlet of the filter element is connected to the pure water outlet, the outlet of the first return water system is connected to the front end of the water pump, and the filter element treats the raw water;

[0011] It also includes the first outlet waterway and the first return waterway, wherein:

[0012] The inlet end of the first water outlet path is connected to the pure water outlet end of the purified water path, and a faucet is installed at the outlet end of the first water outlet path.

[0013] The first water outlet is equipped with an adjustable solenoid valve between its inlet end and the outlet tap.

[0014] The inlet of the first return water path is connected to the pure water outlet of the purified water path and is located at the front end of the adjustable solenoid valve; the outlet of the first return water path is connected to the purified water path, and the pure water flowing out of the pure water outlet can flow back to the purified water path through the first return water path. A return solenoid valve is installed on the first return water path.

[0015] The adjustable solenoid valve and the return solenoid valve are electrically connected to the controller, and the controller selects and controls the operation of the adjustable solenoid valve and the return solenoid valve according to the user's water intake flow rate.

[0016] Furthermore, the water purification circuit is equipped with a composite filter element, a booster pump, and an RO filter element. The composite filter element includes a pre-filter element and a post-filter element. The inlet of the pre-filter element is connected to the raw water inlet. The outlet of the pre-filter element is connected to the inlet of the RO filter element via the booster pump. The outlet of the RO filter element is connected to the inlet of the post-filter element. The outlet of the post-filter element is connected to the pure water outlet. The outlet of the first return water circuit is connected to the front end of the booster pump.

[0017] Furthermore, a first probe is installed on the pipeline between the pre-filter and the booster pump, and a second probe is installed on the pipeline between the RO filter and the post-filter.

[0018] Furthermore, a first one-way valve is provided on the first water outlet path, which is configured to ensure that the pure water flows in a single direction from the pure water outlet to the tap in the first water outlet path; a second one-way valve is provided on the first water return path, which is configured to ensure that the pure water flows in a single direction from the pure water outlet to the purified water path in the first water return path.

[0019] Furthermore, a high-pressure switch and a pure water solenoid valve are provided on the first water outlet line. The high-pressure switch is located on the water line between the adjustable solenoid valve and the water outlet faucet; the pure water solenoid valve is located at the front end of the water outlet faucet.

[0020] As one of the preferred embodiments, the water purification system further includes a second return water path, the inlet of which is connected to the pure water outlet of the purified water path, and the outlet of which is connected to the concentrated water outlet of the RO filter element; a drain solenoid valve and a third check valve are provided on the second return water path, the third check valve being configured to maintain a single flow direction of pure water in the second return water path from the pure water outlet to the concentrated water outlet.

[0021] As one of the preferred embodiments, the water purification system further includes a second water outlet, the inlet of which is connected to the water purification system and is located at the rear end of the pre-filter, the outlet of which is connected to a faucet, and a water purification solenoid valve is provided on the second water outlet.

[0022] As one of the preferred embodiments, the water purification system also includes an external water circuit, the inlet of which is connected to the first outlet water circuit and is located at the front end of the pure water solenoid valve; the outlet of the external water circuit is used to connect to a water terminal, which includes, but is not limited to, a water dispenser, a dishwasher, and a water storage tank.

[0023] Secondly, this utility model provides a water purification device utilizing the aforementioned water purification system. The water purification device includes a middle frame, a water channel plate, and a housing. The middle frame is disposed within the housing, and the water channel plate is disposed on one side of the middle frame. The water channel plate is vertically oriented, with water channels formed internally, and multiple functional components are disposed externally. These multiple functional components are connected to the water channel plate and fluidly communicate with the water channels. The multiple functional components are located on the side of the water channel plate closest to the housing.

[0024] Furthermore, the outer surface of the front cover of the housing is provided with a control panel, which is equipped with function buttons. Users can select the water flow rate of the water purifier through the function buttons. The function buttons are electrically connected to the controller, which receives the water flow rate selection signal and controls the operation of the adjustable solenoid valve and the backflow solenoid valve.

[0025] Furthermore, the middle frame is horizontally provided with a filter element assembly cylinder, in which the filter element is installed; a mounting base is provided at the top of the filter element assembly cylinder, and the booster pump is fixed to the top of the filter element assembly cylinder through the mounting base. The booster pump is connected to the water circuit board and is fluidly connected to the water circuit.

[0026] 3. Beneficial effects

[0027] Compared with existing known technologies, the technical solution provided by this utility model has the following significant advantages:

[0028] (1) The present invention provides a water purification system in which an adjustable solenoid valve is installed between the inlet end of the first outlet water circuit and the outlet faucet, and a first return water circuit is installed at the pure water outlet end of the purified water circuit. A return solenoid valve is installed in conjunction with the first return water circuit. On the one hand, when the water purification device is not used for a long time, the pure water produced by the purified water circuit can be returned to the purified water circuit through the first return water circuit for return filtration, which solves the problem of high TDS value of the first cup of water. On the other hand, by taking advantage of the adjustable orifice diameter of the adjustable solenoid valve, when the user needs a small flow rate of water, the orifice diameter of the adjustable solenoid valve can be reduced, and only a small part of the water passes through the adjustable solenoid valve. The water intercepted by the adjustable solenoid valve returns to the purified water circuit through the return solenoid valve and participates in water production again. The user can select the water flow rate according to their own needs, which improves the user experience.

[0029] (2) The water purification system of this utility model is further provided with a second return water circuit. The inlet end of the second return water circuit is connected to the pure water outlet end of the water purification circuit, and the outlet end is connected to the concentrated water outlet circuit of the RO filter. Users can choose to discharge the stale water in the water circuit through the second return water circuit when the water purification device is not used for a long time, according to their own needs, thereby further improving the health and safety of drinking water.

[0030] (3) The water purification system of this utility model is further provided with a second water outlet. The inlet of the second water outlet is located at the rear end of the pre-filter, and the outlet is connected to the water tap, realizing the function of dual water outlet for domestic water and direct drinking water, and improving the practicality of the water purification device.

[0031] (4) The water purification system of this utility model is further provided with an external water circuit. The inlet end of the external water circuit is connected to the first outlet water circuit and is located at the front end of the pure water solenoid valve. The outlet end of the external water circuit is connected to the water terminal. Users can choose the water terminal according to their own needs, including but not limited to pipeline machines, dishwashers and water storage tanks, etc., which is more versatile and practical.

[0032] (5) The water purification device of this utility model has a water circuit board set vertically. Multiple functional components are set on the side of the water circuit board close to the outer shell. When inspecting and maintaining the water purification device, only one side of the shell needs to be disassembled. It is not necessary to disassemble all the components of the water purification device, which makes inspection and maintenance more convenient.

[0033] (6) The water purification device of this utility model fixes the booster pump to the top of the middle frame filter element assembly cylinder through the mounting base, which not only helps to reduce noise, but also makes the water circuit structure that is fluidly connected to the booster pump more compact, which facilitates the internal space layout of the water purification device. Attached Figure Description

[0034] Figure 1 This is a waterway diagram of one embodiment of the present invention;

[0035] Figure 2 This is a waterway diagram of another embodiment of the present invention;

[0036] Figure 3 This is a waterway diagram of another embodiment of the present invention;

[0037] Figure 4 This is a waterway diagram of another embodiment of the present invention;

[0038] Figure 5 This is a diagram showing the internal structure of the water purification device housing in this utility model.

[0039] Explanation of the labels in the diagram:

[0040] 1. Water purification circuit; 11. Three-way valve; 12. Composite filter element; 13. First probe; 14. Inlet solenoid valve; 15. Booster pump; 16. RO filter element; 17. Second probe; 18. Concentrate solenoid valve;

[0041] 2. First water outlet circuit; 21. Adjustable solenoid valve; 22. First check valve; 23. High-pressure switch; 24. Pure water solenoid valve; 25. Water tap;

[0042] 3. First return water circuit; 31. Return solenoid valve; 32. Second check valve;

[0043] 4. Second return water circuit; 41. Drain solenoid valve; 42. Third check valve;

[0044] 5. Second water outlet; 51. Water purification solenoid valve;

[0045] 6. External water supply; 61. Water terminal;

[0046] 7. Middle frame; 71. First assembly cylinder; 72. Second assembly cylinder; 73. Mounting base;

[0047] 8. Waterway plate; 81. Water inlet;

[0048] 9. Outer shell; 91. Front cover; 92. Rear cover; 93. Connector. Detailed Implementation

[0049] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0050] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of each component in a certain specific posture (the posture of the water purification equipment during normal use in this utility model). If the specific posture changes, the directional indicators will also change accordingly.

[0051] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of indicated technical features. Therefore, features defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. If the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0052] Example 1

[0053] This embodiment provides a water purification system, which includes a water purification system 1, which has a raw water inlet and a pure water outlet. Raw water flows into the water purification system through the raw water inlet and is treated by the filter element. The pure water obtained from the treatment flows out of the water purification system through the pure water outlet.

[0054] For example, in this embodiment, a water pump and a filter element are sequentially arranged along the water flow direction in the water purification circuit. The inlet of the water pump is connected to the raw water inlet, the outlet of the water pump is connected to the inlet of the filter element, and the outlet of the filter element is connected to the pure water outlet. During the water purification process, the water pump can be used to increase the water pressure in the downstream pipeline and the device, allowing water with a certain pressure to pass through the filter element, thereby producing pure water. A water purification device equipped with a water pump achieves a more ideal purification effect. In this embodiment, the outlet of the first return water circuit 3 is connected to the front end of the water pump. Thus, under the pressure boost of the water pump, pure water is more easily returned from the first return water circuit 3 to participate in the re-purification of water. The water pump and filter element are optional. Figure 1 The booster pump 15 and RO filter element 16 are shown.

[0055] The water purification system also includes a first outlet water path 2 and a first return water path 3, wherein:

[0056] The inlet end of the first water outlet 2 is connected to the pure water outlet end of the water purification system. The pure water treated by the water purification system flows into the first water outlet 2 and is discharged through the water outlet faucet 25 set at the outlet end of the first water outlet 2 for user use.

[0057] The first water outlet path 2 is equipped with an adjustable solenoid valve 21 between its inlet end and the faucet 25. As the name suggests, the adjustable solenoid valve 21 is a flow-adjustable solenoid valve with an adjustable flow channel orifice diameter, controlled by a controller within the water purification device. In this embodiment, a flow adjustment button (i.e., the function button) is provided on the control panel of the faucet 25. The controller is electrically connected to this flow adjustment button and the adjustable solenoid valve 21. The faucet 25 is in a high-flow-rate state by default. In this state, the adjustable solenoid valve 21 is normally open and closed. When the user needs a low-flow-rate water output, they can press the corresponding flow adjustment button on the control panel of the faucet 25. At this time, the adjustable solenoid valve 21 remains open, the orifice diameter of the flow channel decreases, and only a small portion of water can pass through the adjustable solenoid valve 21 and flow out of the faucet 25.

[0058] To prevent the water trapped by the adjustable solenoid valve 21 from increasing the internal pipeline pressure of the water purification device and causing malfunctions, this embodiment sets the inlet of the first return water path 3 to be connected to the pure water outlet of the purified water path, and places the inlet of the first return water path 3 at the front end of the adjustable solenoid valve 21. A return solenoid valve 31 is installed on the first return water path 3, and the outlet of the first return water path 3 is connected to the main pipeline of the purified water path 1. In this way, the pure water flowing out of the pure water outlet, especially the water trapped by the adjustable solenoid valve 21, can flow back to the purified water path 1 through the first return water path 3 and participate in water purification again. The return solenoid valve 31 is also controlled by the controller inside the water purification device.

[0059] Based on the above design, raw water enters the purified water circuit, is treated by the filter element installed in the purified water circuit, and then flows out from the water tap 25 through the adjustable solenoid valve 21. The water tap 25 is in the default state of high flow rate, at which time the adjustable solenoid valve 21 is in the normally open state. When the user needs a lower flow rate, they can press the corresponding flow adjustment button on the control panel of the water tap 25. At this time, the adjustable solenoid valve 21 is controlled by the controller, and the orifice of the flow channel inside the valve becomes smaller, allowing only a small amount of water to pass through. At the same time, the adjustable solenoid valve 21 intercepts excess water, which flows back to the main water circuit of the purified water circuit 1 through the return solenoid valve 31, and then circulates the water. The user can select the flow rate according to their own needs, and the flow rate can be easily switched between "large basins and small cups" with a single button on the water tap 25.

[0060] On the other hand, the first return water path 3 in this embodiment can also be set up so that when the water purification device is not used for a long time, the controller can open the return solenoid valve 31 to return the stale water in the purified water path to the main water path of the purified water path, and re-filter the stale water in the purified water path to achieve the zero stale water function, keep the water quality fresh and pure, and solve the problem of high TDS value of the first cup of water.

[0061] In this invention, the main function of the water purification circuit is to treat the incoming raw water to remove various pollutants and produce pure water. Furthermore, there are numerous water purification circuit designs used in various water purification devices on the market. This embodiment only provides a representative water purification circuit structure as an example. Other embodiments obtained by those skilled in the art, based on the teachings of this invention and by only modifying the water purification circuit structure, should fall within the scope of protection of this invention.

[0062] Combination Figure 1 As an exemplary implementation, the purified water circuit is equipped with a composite filter element 12, a booster pump 15, and an RO filter element 16. The composite filter element 12 includes a pre-filter element and a post-filter element. The inlet of the pre-filter element is connected to the raw water inlet. A three-way valve 11 is installed at the raw water inlet. The raw water undergoes primary filtration through the pre-filter element of the composite filter element 12. The pre-filter element and the RO filter element 16 are connected by a pipeline. An inlet solenoid valve 14 and a booster pump 15 are sequentially installed on the pipeline in the direction of water flow. The outlet of the RO filter element 16 is connected to the inlet of the post-filter element, and the outlet of the post-filter element is connected to the pure water outlet. The concentrate end of the RO filter element 16 is connected to the concentrate outlet water circuit, which is equipped with a concentrate solenoid valve 18. In this embodiment, the outlet of the first return water circuit 3 is connected to the front end of the booster pump 15, specifically between the inlet solenoid valve 14 and the booster pump 15.

[0063] Preferably, in this embodiment, a first probe 13 is installed on the pipeline between the pre-filter and the booster pump 15, and a second probe 17 is installed on the pipeline between the RO filter 16 and the post-filter. The first probe 13 and the second probe 17 can be used to monitor water quality and / or temperature. In this embodiment, both the first probe 13 and the second probe 17 are TDS probes. The first probe 13 monitors the water quality after filtration by the pre-filter in real time, and the second probe 17 monitors the water quality after filtration by the RO filter 16 in real time. The water quality data monitored by the two probes are transmitted to the controller in real time, allowing the controller to judge the filtration effect and ensure that the effluent water quality meets the requirements.

[0064] In another preferred embodiment, a first one-way valve 22 is provided on the first water outlet path 2. The first one-way valve 22 is configured to keep the pure water in the first water outlet path 2 flowing in a single direction from the pure water outlet to the water tap 25. A second one-way valve 32 is provided on the first water return path 3. The second one-way valve 32 is configured to keep the pure water in the first water return path 3 flowing in a single direction from the pure water outlet to the purified water path 1.

[0065] Meanwhile, in this embodiment, a high-pressure switch 23 and a pure water solenoid valve 24 are installed on the first water outlet 2. The high-pressure switch 23 is located on the water line between the adjustable solenoid valve 21 and the water tap 25. The water purification device uses the high-pressure switch 23 to detect the water pressure in the first water outlet 2 to determine whether there is a water demand. When the water pressure in the first water outlet 2 decreases, there is a water demand, and the water purification device is activated. The pure water solenoid valve 24 is located at the front end of the water tap 25.

[0066] Example 2

[0067] Combination Figure 2 This embodiment of the water purification system, based on the content disclosed in Embodiment 1, further designs a second return water path 4. The inlet of the second return water path 4 is connected to the pure water outlet of the purified water path, and the outlet of the second return water path 4 is connected to the concentrated water outlet of the RO filter element 16, specifically located at the rear end of the concentrated water solenoid valve 18. A drain solenoid valve 41 and a third check valve 42 are installed on the second return water path 4. The drain solenoid valve 41 is electrically connected to the controller, and the third check valve 42 is configured to maintain a single flow direction of pure water in the second return water path 4, from the pure water outlet to the concentrated water outlet. Users can choose to drain stagnant water in the water path through the second return water path 4 when the water purification device is not used for a long time, further improving the health and safety of drinking water.

[0068] Example 3

[0069] Combination Figure 3In this embodiment of the water purification system, a second water outlet 5 is further designed. The inlet end of the second water outlet 5 is connected to the purified water circuit and is located at the rear end of the pre-filter. The outlet end of the second water outlet 5 is connected to the water faucet 25. A water purification solenoid valve 51 is installed on the second water outlet 5. The water purification solenoid valve 51 is electrically connected to the controller. Water that has been pre-filtered by the pre-filter can be discharged from the water faucet 25 through the water purification solenoid valve 51, realizing the function of dual water outlet for domestic water and direct drinking water, and improving the practicality of the water purification device.

[0070] Example 4

[0071] Combination Figure 4 In this embodiment of the water purification system, an external water path 6 is further designed. The inlet end of the external water path 6 is connected to the first outlet water path 2 and is located at the front end of the pure water solenoid valve 24. The outlet end of the external water path 6 is connected to the water terminal 61. The water terminal 61 mainly refers to equipment that can be used with the water purification device under normal circumstances, including but not limited to water dispensers, dishwashers and water storage tanks. The water purification system is equipped with an external water path 6, which makes the water purification device more capable of performing functions.

[0072] It is worth noting that the second return water path 4, the second outlet water path 5, and the external water path 6 provided in this utility model respectively realize the functions of zero stagnant water, domestic water and direct drinking water dual water output, and use in conjunction with water terminals. In actual implementation, all or part of the three water paths can be freely added based on the water path system disclosed in Example 1, and all of them should fall within the scope of protection of this utility model.

[0073] Example 5

[0074] Combination Figure 5 This embodiment of a water purification device includes a middle frame 7, a water circuit plate 8, and a housing 9. The housing 9 has an internal installation space. The middle frame 7 is disposed within the housing 9, with one side connected to the front cover 91 of the housing 9 and the other side connected to the water circuit plate 8. A control panel is located on the outer surface of the front cover 91 near the water outlet 25. The control panel has function buttons, allowing the user to select the water flow rate of the purification device. The function buttons are electrically connected to a controller, which receives the water flow rate selection signal and controls the adjustable solenoid valve 21 and the return solenoid valve 31 to switch the drinking water flow rate of the purification device.

[0075] The middle frame 7 is provided with a filter cartridge assembly cylinder arranged horizontally. In this embodiment, it includes a first assembly cylinder 71 and a second assembly cylinder 72 arranged vertically. The first assembly cylinder 71 is located on the upper side of the second assembly cylinder 72. The composite filter cartridge 12 is horizontally inserted into the first assembly cylinder 71, and the RO filter cartridge 16 is horizontally inserted into the second assembly cylinder 72.

[0076] The water circuit plate 8 is vertically arranged, with a water inlet 81 at the top and a water channel formed inside. The composite filter element 12 and the RO filter element 16 are connected to the water circuit plate 8 and are fluidly connected to the water channel.

[0077] A mounting base 73 is provided on the top of the first assembly cylinder 71. The booster pump 15 is fixed to the top of the first assembly cylinder 71 through the mounting base 73. The booster pump 15 is connected to the water circuit plate 8 and is fluidly connected to the water circuit.

[0078] The water circuit board 8 is equipped with multiple functional components on its exterior, including the aforementioned inlet solenoid valve 14, concentrate solenoid valve 18, adjustable solenoid valve 21, reflux solenoid valve 31, drain solenoid valve 41, and other valve groups. These multiple functional components are connected to the water circuit board 8 and are fluidly connected to the water circuit. The multiple functional components are located on the side of the water circuit board close to the outer shell 9, specifically close to the rear cover 92 connected to the water circuit board 8 via a connector 93.

[0079] In this embodiment, the composite filter element 12, the booster pump 15, the RO filter element 16, and the internal water channels and external functional components of the water circuit board 8 together constitute the water purification system described in embodiments 1-4.

[0080] In this embodiment, the booster pump 15, composite filter element 12, and RO filter element 16 are located on the same side of the water circuit board 8, while multiple functional components are located on different sides of the water circuit board 8. Furthermore, the multiple functional components are concentrated on the side of the water circuit board 8 near the rear cover 92. When inspecting and maintaining the water purification device, only the rear cover 92 needs to be opened; all components of the water purification device do not need to be disassembled to complete the entire maintenance work, making it more convenient to use. In this embodiment, the water outlet 81 of the water circuit board 8 is designed to face upwards, corresponding to the composite filter element 12 being on top and the RO filter element 16 on the bottom, with the booster pump 15 fixed at the top of the filter element assembly cylinder. This arrangement allows the water path in the water circuit board 8 to be as short and compact as possible; it can adapt to situations where there is insufficient space in the width direction of the water purification device, ensuring that the filter element length meets the filtration efficiency requirements as much as possible. The location of the booster pump 15 at the top of the filter element assembly cylinder also helps to reduce noise.

Claims

1. A water purification system, comprising a water purification circuit (1), wherein the water purification circuit has a raw water inlet and a pure water outlet; a water pump and a filter element are installed on the water purification circuit, the inlet of the water pump is connected to the raw water inlet, the outlet of the water pump is connected to the inlet of the filter element, and the outlet of the filter element is connected to the pure water outlet; characterized in that: It also includes the first outlet waterway (2) and the first return waterway (3), wherein: The inlet end of the first water outlet path (2) is connected to the pure water outlet end of the purified water path, and a water outlet faucet (25) is provided at the outlet end of the first water outlet path (2). The first water outlet channel (2) is equipped with an adjustable solenoid valve (21) between its inlet end and the outlet faucet (25); The inlet end of the first return water path (3) is connected to the pure water outlet end of the purified water path and is located at the front end of the adjustable solenoid valve (21); the outlet end of the first return water path (3) is connected to the front end of the water pump in the purified water path (1), and the pure water flowing out of the pure water outlet end can flow back to the purified water path (1) through the first return water path (3). A return solenoid valve (31) is provided on the first return water path (3). The adjustable solenoid valve (21) and the return solenoid valve (31) are electrically connected to the controller. The controller selects and controls the operation of the adjustable solenoid valve (21) and the return solenoid valve (31) according to the user's water intake flow rate.

2. The water purification system according to claim 1, characterized in that: The water purification circuit is equipped with a composite filter element (12), a booster pump (15), and an RO filter element (16). The composite filter element (12) includes a pre-filter element and a post-filter element. The inlet of the pre-filter element is connected to the raw water inlet. The outlet of the pre-filter element is connected to the inlet of the RO filter element (16) via the booster pump (15). The outlet of the RO filter element (16) is connected to the inlet of the post-filter element. The outlet of the post-filter element is connected to the pure water outlet. The outlet of the first return water circuit (3) is connected to the front end of the booster pump (15).

3. A water purification system according to claim 2, characterized in that: A first probe (13) is installed on the pipeline between the pre-filter and the booster pump (15), and a second probe (17) is installed on the pipeline between the RO filter (16) and the post-filter.

4. A water purification system according to any one of claims 1-3, characterized in that: The first outlet water path (2) is provided with a first one-way valve (22), which is configured to keep the pure water in the first outlet water path (2) flowing in a single direction from the pure water outlet to the water tap (25); the first return water path (3) is provided with a second one-way valve (32), which is configured to keep the pure water in the first return water path (3) flowing in a single direction from the pure water outlet to the clean water path (1).

5. A water purification system according to any one of claims 1-3, characterized in that: The first water outlet path (2) is equipped with a high-pressure switch (23) and a pure water solenoid valve (24). The high-pressure switch (23) is located on the water path between the adjustable solenoid valve (21) and the water outlet faucet (25). The pure water solenoid valve (24) is located at the front end of the water outlet faucet (25).

6. A water purification system according to claim 2 or 3, characterized in that: The water purification system also includes a second return water path (4), the inlet of which is connected to the pure water outlet of the water purification system, and the outlet of which is connected to the concentrated water outlet of the RO filter (16); a drain solenoid valve (41) and a third check valve (42) are provided on the second return water path (4), and the third check valve (42) is configured to keep the pure water in the second return water path (4) flowing in a single direction from the pure water outlet to the concentrated water outlet.

7. A water purification system according to claim 2 or 3, characterized in that: The water purification system also includes a second water outlet (5), the inlet of which is connected to the water purification system and is located at the rear end of the pre-filter. The outlet of the second water outlet (5) is connected to the faucet (25), and a water purification solenoid valve (51) is installed on the second water outlet (5).

8. A water purification system according to claim 5, characterized in that: The water purification system also includes an external water path (6), the inlet of which is connected to the first outlet water path (2) and is located at the front end of the pure water solenoid valve (24); the outlet of the external water path (6) is used to connect to the water terminal (61).

9. A water purification device, characterized in that: The water purification system according to any one of claims 1-8.

10. A water purification device according to claim 9, characterized in that: It includes a middle frame (7), a water channel plate (8) and a shell (9). The middle frame (7) is disposed inside the shell (9), and the water channel plate (8) is disposed on one side of the middle frame (7). The water channel plate (8) is vertically arranged, with water channels formed inside and multiple functional components disposed outside. The multiple functional components are connected to the water channel plate (8) and fluidly communicate with the water channels. The multiple functional components are located on the side of the water channel plate close to the shell (9).

11. A water purification device according to claim 10, characterized in that: The outer surface of the front cover (91) of the outer shell (9) is provided with a control panel. The control panel is provided with function buttons. The user selects the water flow rate of the water purification device through the function buttons. The function buttons are electrically connected to the controller. The controller receives the water flow rate selection signal and controls the operation of the adjustable solenoid valve (21) and the return solenoid valve (31).

12. A water purification device according to claim 10, characterized in that: The middle frame (7) is horizontally provided with a filter element assembly cylinder, and the filter element is installed in the filter element assembly cylinder; the top of the filter element assembly cylinder is provided with a mounting seat (73), and the booster pump (15) is fixed to the top of the filter element assembly cylinder through the mounting seat (73). The booster pump (15) is connected to the water circuit plate (8) and is fluidly connected to the water circuit.

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