Water purifier waterway structure

Abstract

The application discloses a water purifier water path structure, which comprises a filter element and an integrated water path plate. The integrated water path plate is integrated with a flow detection device and a reversing valve. The inlet end of the reversing valve is communicated with the pure water outlet of the filter element. One outlet end of the reversing valve is arranged as a water supply outlet end communicated with the water supply end interface of the water purifier. The other outlet end of the reversing valve is arranged as a pressure relief outlet end communicated with the waste discharge interface of the water purifier. The flow detection device is signal connected and controls the valve core action of the reversing valve. When the flow detection device detects a water supply flow signal, the reversing valve is controlled to open the water supply outlet end and close the pressure relief outlet end, thereby forming a water supply path for supplying water to the water supply end interface. When the flow detection device detects a stop water supply flow signal, the reversing valve is controlled to close the water supply outlet end and open the pressure relief outlet end, thereby forming a pressure relief path for discharging pressure to the waste discharge interface. The water purifier water path structure can effectively improve the continuous dripping problem caused by the residual pressure of the filter element and improve the user experience.

Description

Technical Field

[0001] This application relates to the field of drinking water treatment equipment technology, specifically to a water circuit structure for a water purifier. Background Technology

[0002] Water purifiers are common drinking water filtration and purification devices in daily life, such as reverse osmosis water purifiers, ultrafiltration water purifiers, and microfiltration water purifiers. These water purifiers bring great convenience to life, but some technical problems also exist. One particularly noticeable issue is the delayed dripping from the outlet bend after the water outlet switch is turned off. This problem occurs because the filter element (such as the reverse osmosis membrane or ultrafiltration membrane) needs to maintain a certain working pressure during filtration. When the switch is turned off, the residual pressure inside the filter element continues to release water, ultimately causing continuous dripping at the outlet bend for several seconds or even tens of seconds, resulting in a poor user experience.

[0003] To address the issue of delayed dripping, several solutions have emerged, such as raising the outlet bend or adding a valve before the bend. Raising the outlet bend utilizes gravity to counteract residual pressure in the filter cartridge; however, in most household under-sink spaces, the required space for this is insufficient. Furthermore, the abrupt stop in water flow when the tap is closed creates negative pressure at the higher part of the bend, drawing in residual water from the filter cartridge and sometimes actually prolonging the dripping time. Adding a valve before the bend increases water flow resistance during normal flow, and the rapid closure of the valve when the tap is shut off causes the water to impact the filter cartridge due to inertia, potentially damaging it. Utility Model Content

[0004] The purpose of this application is to solve the above-mentioned technical problems and provide a water circuit structure for a water purifier, which improves the problem of continuous dripping caused by residual pressure in the filter element after the water outlet switch is turned off by the linkage control of the flow detection device and the reversing valve.

[0005] The technical solution adopted in this application is as follows:

[0006] A water circuit structure for a water purifier includes a filter element and an integrated water circuit board. The integrated water circuit board integrates a flow detection device and a reversing valve. The inlet end of the reversing valve is connected to the pure water outlet of the filter element. One outlet end of the reversing valve is configured as a water supply outlet end connected to the water supply interface of the water purifier, and the other outlet end of the reversing valve is configured as a pressure relief outlet end connected to the waste discharge interface of the water purifier. The flow detection device is signal-connected to and controls the valve core of the reversing valve to switch the water flow path by changing the opening and closing states of the water supply outlet end and the pressure relief outlet end. When the flow detection device detects a water supply flow signal, it controls the reversing valve to open the water supply outlet end and close the pressure relief outlet end, thereby forming a water supply path to the water supply interface. When the flow detection device detects a stop water supply flow signal, it controls the reversing valve to close the water supply outlet end and open the pressure relief outlet end, thereby forming a pressure relief path to the waste discharge interface.

[0007] In this technical solution, a flow detection device and a reversing valve are integrated into the integrated water circuit board. The flow detection device controls the valve core movement of the reversing valve to change the water flow direction. During normal water supply, the flow detection device detects the water supply flow signal, and the reversing valve connects the pure water outlet of the filter element to the water supply port of the water purifier (the water supply port can be connected to the outlet bend), allowing the water purifier to supply water normally. When water supply stops, the flow detection device detects the stop water supply flow signal, and the reversing valve connects the pure water outlet of the filter element to the waste discharge port of the water purifier (the waste discharge port can be connected to the municipal sewer or other suitable location), allowing the water that continues to be produced by the filter element due to residual pressure to be discharged through the waste discharge port and no longer flow to the water supply port. Therefore, this application realizes the function of automatically switching between forming a water supply path or a pressure relief path according to the water supply flow, effectively eliminating the problem of continuous dripping from the bend caused by residual pressure in the filter element, and improving the user experience.

[0008] The integrated water circuit board is provided with a water supply channel for the water source to be filtered to supply water to the filter element. The flow detection device is connected to the water supply channel and controls the valve core of the reversing valve to operate by detecting the flow rate of the water in the water supply channel.

[0009] In this technical solution, the flow detection device is connected to the water supply channel, which allows the reversing valve to be controlled by directly detecting the water flow rate in the water supply channel. This enables more precise regulation of the water flow direction based on the actual water supply situation, further optimizing the control accuracy of the entire water circuit structure.

[0010] The flow detection device is a mechanical flow switch. The mechanical flow switch is set with a trigger flow threshold. When the flow rate in the water supply channel is greater than the trigger flow threshold, the reversing valve is triggered to open the water supply outlet and close the pressure relief outlet. When the flow rate in the water supply channel is less than or equal to the trigger flow threshold, the reversing valve is triggered to close the water supply outlet and open the pressure relief outlet.

[0011] In this technical solution, a mechanical flow switch is used and a trigger flow threshold is set. This allows for precise triggering of the corresponding valve core action with a clear flow limit, thereby reliably switching the opening and closing of the water supply outlet and the pressure relief outlet, enhancing the stability and operability of the water circuit control. Preferably, the mechanical flow switch can be an impeller-type flow switch, where the water flow causes the impeller to rotate or stop rotating, causing the permanent magnet on the impeller to act on the reed to open or close.

[0012] A water outlet valve is provided on the fluid path from the water source to the water supply channel, and the flow rate of the water in the water supply channel is controlled by operating the opening and closing of the water outlet valve.

[0013] In this technical solution, an outlet valve is installed on the fluid path from the water source to the water supply channel. By operating this valve, the water flow rate in the water supply channel is controlled, providing users with a way to manually intervene in the water flow and thus affect the working status of the entire water circuit, increasing the flexibility of water circuit control. The outlet valve can be a manual valve, achieving compatibility between manual and automatic control, and meeting the user's need for temporary interruption of water supply.

[0014] The pressure relief outlet is connected to the waste discharge port through a pressure relief pipeline, and the back pressure value of the pressure relief pipeline is less than the back pressure value of the water supply outlet.

[0015] In this technical solution, the pressure relief outlet and the waste discharge interface are connected through a pressure relief pipeline and the back pressure value is controlled to be less than the back pressure value of the water supply outlet. This helps to ensure that the water flow can smoothly flow to the waste discharge interface when pressure relief is required, ensuring the smoothness of the pressure relief path, avoiding drainage residue caused by back pressure balance, and avoiding abnormal pressure.

[0016] The waste discharge port is connected to the municipal sewer inlet, the water supply port is set as a water outlet bend, and the waste discharge port is lower than the water supply outlet.

[0017] In this technical solution, the waste discharge interface is connected to the municipal sewer inlet, which can ensure pressure relief efficiency without the need for an additional pressurization device, reducing system complexity. In addition, the municipal sewer inlet is usually directly connected to the outside atmosphere, so the air pressure in the pressure relief pipeline is also close to atmospheric pressure. Furthermore, the waste discharge interface is lower than the water supply outlet end, thereby ensuring that the back pressure value of the pressure relief pipeline is less than the back pressure value of the water supply outlet end.

[0018] The water purifier's water circuit structure includes an upper shell and a base. The upper shell and the base are detachably fitted to form a filter cartridge receiving cavity, in which the filter cartridge is placed. The base is provided with a water circuit board receiving cavity, in which the integrated water circuit board is placed.

[0019] In this technical solution, the upper shell and the base form a filter cartridge receiving cavity and a water circuit board receiving cavity, which facilitates the installation, disassembly and maintenance of the filter cartridge and the integrated water circuit board, making the entire water purifier water circuit structure more convenient in terms of assembly and subsequent use and maintenance.

[0020] The integrated water circuit board is provided with an inlet connector and an outlet connector that extend upward through the filter element housing cavity. The inlet connector is connected to the water inlet of the filter element, and the outlet connector is connected to the pure water outlet of the filter element. The bottom of the base is open, and the flow detection device and the reversing valve are installed at the bottom of the integrated water circuit board through the open.

[0021] In this technical solution, the integrated water circuit board is equipped with an inlet connector and an outlet connector that extend upward through the filter cartridge housing cavity, which facilitates connection with the filter cartridge inlet and pure water outlet. At the same time, the flow detection device and the reversing valve are installed from the open bottom of the base, which is conducive to the installation layout of each component and optimizes the connection and assembly method of the entire water circuit structure.

[0022] The waste discharge port is equipped with a one-way check valve, and the opening direction of the one-way check valve allows the waste discharge port to drain water outward in one direction only.

[0023] In this technical solution, by setting a one-way check valve at the waste discharge interface and limiting its opening direction, the backflow of water or other substances downstream of the waste discharge interface into the reversing valve and water circuit system can be effectively prevented, ensuring the one-way flow of water in the water circuit and guaranteeing the hygiene and normal operation of the entire water purifier water circuit structure.

[0024] The water purifier's water circuit structure also includes a control circuit board, which is equipped with a timed shutdown module. The timed shutdown module controls the pressure relief outlet to close after the pressure relief outlet has been kept open for a preset time.

[0025] In this technical solution, the pressure relief outlet is controlled to close at a specific time by a timed shutdown module, which helps prevent odors from seeping into the sewer. Attached Figure Description

[0026] 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:

[0027] Figure 1This is a schematic diagram of the water circuit structure of the water purifier provided in the embodiments of this application.

[0028] Figure 2 Assembly of the water circuit structure of the water purifier provided in the embodiments of this application Figure 1 ;

[0029] Figure 3 This is an exploded view of the water circuit structure of the water purifier provided in the embodiments of this application;

[0030] Figure 4 This is a cross-sectional view of the water circuit structure of the water purifier provided in the embodiment of this application;

[0031] Figure 5 Assembly of the water circuit structure of the water purifier provided in the embodiments of this application Figure 2 .

[0032] List of components and reference numerals:

[0033] 1. Filter element;

[0034] 2. Integrated water circuit board; 21. Water supply channel; 22. Inlet connector; 23. Outlet connector;

[0035] 3. Flow detection device;

[0036] 4. Reversing valve; 41. Water supply outlet; 42. Pressure relief outlet.

[0037] 5 waste discharge interfaces;

[0038] 6. Water outlet valves;

[0039] 7. Pressure relief pipeline;

[0040] 8. Water outlet bend;

[0041] 9. Top shell;

[0042] 10 bases, 101 water channel plate receiving cavity;

[0043] 20 filter cartridge housing cavity;

[0044] 30 One-way check valve;

[0045] 40. Control circuit board. Detailed Implementation

[0046] To more clearly illustrate the overall concept of this application, a detailed explanation is provided below with reference to the accompanying drawings.

[0047] 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.

[0048] Furthermore, it should be understood in the description of this application that the terms "upper," "lower," "top," "bottom," "inner," "outer," "axial," "radial," "circumferential," "lateral," and "longitudinal," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0049] 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.

[0050] In this application, unless otherwise expressly specified and limited, the "above" or "below" of the second feature can mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. In the description of this specification, references to terms such as "an 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 can be combined in any suitable manner in one or more embodiments or examples.

[0051] In the embodiments of this application, reference is made to Figures 1 to 5 As shown, a water circuit structure for 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.

[0052] The water circuit structure of the water purifier includes a filter element 1 and an integrated water circuit board 2. The integrated water circuit board 2 integrates a flow detection device 3 and a reversing valve 4. The inlet end of the reversing valve 4 is connected to the pure water outlet of the filter element 1. One outlet end of the reversing valve 4 is set as the water supply outlet end 41, which is connected to the water supply interface of the water purifier. The other outlet end of the reversing valve 4 is set as the pressure relief outlet end 42, which is connected to the waste discharge interface 5 of the water purifier. The flow detection device 3 is connected to and controls the valve core of the reversing valve 4 to switch the water flow path by changing the opening and closing state of the water supply outlet end 41 and the pressure relief outlet end 42. When the flow detection device 3 detects the water supply flow signal, it controls the reversing valve 4 to open the water supply outlet end 41 and close the pressure relief outlet end 42, thereby forming a water supply path to supply water to the water supply interface. When the flow detection device 3 detects the stop water supply flow signal, it controls the reversing valve 4 to close the water supply outlet end 41 and open the pressure relief outlet end 42, thereby forming a pressure relief path to relieve pressure to the waste discharge interface 5.

[0053] The water purifier can be a reverse osmosis water purifier, an ultrafiltration water purifier, a microfiltration water purifier, etc. Specifically, the reversing valve 4 can be any type of reversing valve known in the art or that may emerge in the future, preferably an electromagnetic reversing valve. The flow detection device 3 can be a flow meter or a flow switch. Some flow meters and flow switches on the market can only detect flow signals and zeroing signals. When the water outlet is turned on, the flow meter or flow switch detects the flow and opens the water supply passage. When the water outlet is turned off, the flow returns to zero, triggering the reversing valve to switch to the pressure relief passage. However, if there is still a small amount of water flow after the water outlet is turned off, the flow meter or flow switch may not switch in time, resulting in incomplete release of residual pressure and continued dripping. Therefore, it is necessary to select a high-sensitivity flow meter and flow switch, or a flow meter or flow switch with flow threshold control. In addition, the control method of the reversing valve 4 by the flow detection device 3 after detecting the signal can be realized by the control circuit board. In this technical solution, by integrating the flow detection device 3 and the reversing valve 4 on the integrated water circuit board 2, the flow detection device 3 controls the valve core of the reversing valve 4 to change the direction of water flow. During normal water supply, the flow detection device 3 detects the water supply flow signal, and the reversing valve 4 connects the pure water outlet of filter element 1 to the water supply port of the water purifier (the water supply port can be connected to the outlet elbow 8), allowing the water purifier to supply water normally. When water supply stops, the flow detection device 3 detects the stop water supply flow signal, and the reversing valve 4 connects the pure water outlet of filter element 1 to the waste discharge port 5 of the water purifier (the waste discharge port 5 can be connected to the municipal sewer or other suitable location), allowing the water that continues to be produced in filter element 1 due to residual pressure to be discharged through the waste discharge port 5 and no longer flow to the water supply port. Therefore, this application realizes the function of automatically switching between forming a water supply path or a pressure relief path according to the water supply flow, effectively eliminating the problem of continuous dripping caused by residual pressure in filter element 1 and improving the user experience.

[0054] As a preferred embodiment of this application, such as Figure 1and Figure 4 As shown, the integrated water circuit board 2 is provided with a water supply channel 21 for supplying water from the source to be filtered to the filter element 1. The flow detection device 3 is connected to the water supply channel 21 and controls the valve core of the reversing valve 4 by detecting the flow rate of the water in the water supply channel 21. When the water outlet is turned on, the source to be filtered supplies water to the filter element 1 through the water supply channel 21. When the water flows through the water supply channel 21, the flow detection device 3 directly detects the flow rate of the water in the water supply channel 21 to control the reversing valve 4. For example, the detection probe of the flow detection device 3 can be directly inserted into the water supply channel 21 for sensing detection, or the flow detection device 3 can directly form a section of the path of the water supply channel 21, and the water is detected when it passes through the flow detection device 3. This allows for more accurate regulation of the water flow direction based on the actual water supply situation, further optimizing the control accuracy of the entire water circuit structure.

[0055] In a preferred embodiment, the flow detection device 3 is a mechanical flow switch. The mechanical flow switch has a set trigger flow threshold. When the flow rate in the water supply channel 21 exceeds the trigger flow threshold, the reversing valve 4 is triggered to open the water supply outlet 41 and close the pressure relief outlet 42. When the flow rate in the water supply channel 21 is less than or equal to the trigger flow threshold, the reversing valve 4 is triggered to close the water supply outlet 41 and open the pressure relief outlet 42. By using a mechanical flow switch and setting a trigger flow threshold, the corresponding valve core action can be precisely triggered with a clear flow limit, thereby reliably realizing the opening and closing switching of the water supply outlet 41 and the pressure relief outlet 42, enhancing the stability and operability of the water circuit control. Preferably, the mechanical flow switch can be an impeller-type flow switch. The impeller converts the kinetic energy of water into mechanical rotation. When the water outlet is closed, the flow rate in the water supply channel 21 gradually decreases until it is less than or equal to the trigger flow threshold of the flow switch. The impeller then decelerates until it stops, and the permanent magnet mounted on it moves away from the reed switch, causing the reed to open. This controls the reversing valve 4 to close the water supply outlet 41 and open the pressure relief outlet 42. When the water outlet is opened, the flow rate in the water supply channel 21 increases to a level greater than the trigger flow threshold. The water flow impacts the impeller, causing it to rotate. The permanent magnet on the impeller periodically cuts the magnetic field of the reed switch, causing the reed contacts to close. The control circuit controls the reversing valve 4 to open the water supply outlet 41 and close the pressure relief outlet 42. Specifically, different models of flow switches can be adapted to different trigger flow thresholds. For example, the trigger flow threshold can be set to 0.5L / min. When the flow rate is greater than 0.5L / min, the reversing valve 4 is triggered to open the water supply outlet 41 and close the pressure relief outlet 42. When the flow rate is less than or equal to 0.5L / min, the reversing valve 4 is triggered to close the water supply outlet 41 and open the pressure relief outlet 42.

[0056] As an alternative embodiment, the mechanical flow switch can also adopt a baffle-type flow switch, a piston-type flow switch, or other suitable structures. For a baffle-type flow switch, the deflection displacement of the baffle directly corresponds to the flow rate. By adjusting the spring stiffness or the baffle lever ratio, the trigger flow threshold (i.e., the flow rate at which the baffle deflects sufficiently to trigger the switch) can be precisely set. The displacement of the baffle directly drives the micro switch, generating a clear "on" or "off" electrical signal (or mechanical linkage signal). This signal can then be used to trigger the reversing valve 4. Specifically, the baffle-type flow switch includes a baffle extending into the water supply channel 21 and a switching mechanism linked to the baffle. When the flow rate is greater than the trigger flow threshold, the switching mechanism drives the baffle to deflect to the first position to trigger the first switching signal. The control circuit controls the reversing valve 4 to open the water supply outlet 41 and close the pressure relief outlet 42. When the flow rate is less than or equal to the trigger flow threshold, the baffle is driven to return to the second position to trigger the second switching signal. The control circuit controls the reversing valve 4 to close the water supply outlet 41 and open the pressure relief outlet 42. For a piston-type flow switch, the pressure of the fluid pushes the piston to move against the spring force. The trigger flow threshold can be set by precisely adjusting the preload of the spring. The movement of the piston can directly drive a micro switch or trigger a switch such as a reed switch through magnetic coupling, generating a control signal to trigger the reversing valve 4. Specifically, the piston-type flow switch includes a piston installed in the water supply channel 21 and a spring acting on the piston. The piston moves against the spring force according to the pressure generated by the flow in the water supply channel 21. When the flow is greater than the trigger flow threshold, the piston is driven to move to the set position, triggering the switch signal. The control circuit controls the reversing valve 4 to open the water supply outlet 41 and close the pressure relief outlet 42. When the flow is less than or equal to the trigger flow threshold, the piston cannot move to the set position and therefore cannot trigger the switch signal.

[0057] In a preferred embodiment, such as Figure 1 As shown, an outlet valve 6 is installed on the fluid path from the water source to the water supply channel 21. By operating the opening and closing of the outlet valve 6, the flow rate of water in the water supply channel 21 is controlled, providing users with a way to manually intervene in the water flow and thus affect the overall operation of the water circuit, increasing the flexibility of water circuit control. The outlet valve 6 can be a manual valve, achieving compatibility between manual and automatic control, and meeting the user's need for temporary interruption of water supply. In addition, since the outlet valve 6 is located upstream of the flow detection device 3, only when the outlet valve 6 is opened will a large amount of water flow into the water supply channel 21, allowing the flow detection device 3 to sensitively detect and control the corresponding action of the reversing valve 4, improving the accuracy of system operation.

[0058] As a preferred embodiment of this application, such as Figure 1As shown, the pressure relief outlet 42 and the waste discharge interface 5 are connected through the pressure relief pipe 7. The back pressure value of the pressure relief pipe 7 is less than the back pressure value of the water supply outlet 41. Those skilled in the art will understand that the back pressure value of the pressure relief pipe 7 refers to the pressure within the pipe system, and the back pressure value of the water supply outlet 41 is the water pressure at the water supply outlet 41 when the water purifier is normally discharging water. This pressure is determined by the water supply resistance (such as the height of the outlet bend, pipe friction, etc.). When the water outlet is closed, the residual pressure inside the filter element 1 needs to be released through a channel with lower back pressure. That is, the resistance of the pressure relief pipe 7 must be significantly less than that of the water supply outlet 41, forcing the water flow to preferentially flow to the low-pressure side, avoiding residual water retention due to pressure balance at both ends. Therefore, in this technical solution, the pressure relief outlet 42 and the waste discharge interface 5 are connected through the pressure relief pipeline 7 and the back pressure value is controlled to be less than the back pressure value of the water supply outlet 41. This helps to ensure that the water flow can smoothly flow to the waste discharge interface 5 when pressure relief is required, ensuring the smoothness of the pressure relief path, avoiding drainage residue caused by back pressure balance, and avoiding abnormal pressure.

[0059] To ensure that the back pressure value of the pressure relief pipe 7 is less than the back pressure value of the water supply outlet 41, preferably, the waste discharge port 5 can be connected to the municipal sewer inlet, the water supply port is set as the outlet bend 8, and the waste discharge port 5 is lower than the water supply outlet 41. In this technical solution, connecting the waste discharge port 5 to the municipal sewer inlet eliminates the need for an additional pressurization device to ensure pressure relief efficiency, reduces system complexity, and since the municipal sewer inlet is usually directly connected to the outside atmosphere, the air pressure in the pressure relief pipe 7 is also close to atmospheric pressure or the static pressure of the drainage system. Combined with the fact that the waste discharge port 5 is lower than the water supply outlet 41, this ensures that the back pressure value of the pressure relief pipe 7 is less than the back pressure value of the water supply outlet 41. Alternatively, as another alternative, the waste discharge port 5 can be connected to a floor drain or a dedicated drainage pipe or other low back pressure system.

[0060] As a preferred embodiment of this application, such as Figure 2 , Figure 3 and Figure 4 As shown, the water purifier's water circuit structure includes an upper shell 9 and a base 10. The upper shell 9 and the base 10 are detachably fitted to form a filter cartridge receiving cavity 20, in which the filter cartridge 1 is placed. The base 10 has a water circuit board receiving cavity 101, in which the integrated water circuit board 2 is placed. The upper shell 9 and the base 10 form the filter cartridge receiving cavity 20 and the water circuit board receiving cavity 101, facilitating the installation, disassembly, and maintenance of the filter cartridge 1 and the integrated water circuit board 2, making the entire water purifier's water circuit structure more convenient in assembly and subsequent use and maintenance. Specifically, the filter cartridge 1 can be pre-installed on the base 10 and connected to the integrated water circuit board 2 before connecting the upper shell 9 to the base 10. The upper shell 9 and the base 10 can be detachably connected using screws or other methods. To improve installation stability, the integrated water circuit board 2 can be fixed to the base 10 using screws.

[0061] Furthermore, such as Figure 3 and Figure 4 As shown, the integrated water circuit board 2 is provided with an inlet connector 22 and an outlet connector 23 that extend upwards through the filter element receiving cavity 20. The inlet connector 22 is connected to the water inlet of the filter element 1, and the outlet connector 23 is connected to the pure water outlet of the filter element 1. The bottom of the base 10 is open, and the flow detection device 3 and the reversing valve 4 are installed at the bottom of the integrated water circuit board 2 through the open opening. Specifically, the inlet connector 22 can be plugged into the water inlet of the filter element 1, and the outlet connector 23 can be plugged into the pure water outlet of the filter element 1. At the same time, the flow detection device 3 and the reversing valve 4 are installed from the open bottom of the base 10, which facilitates the installation layout of each component and optimizes the connection and assembly method of the entire water circuit structure.

[0062] As a preferred embodiment of this application, such as Figure 1 As shown, a one-way check valve 30 is provided at the waste discharge port 5. The opening direction of the one-way check valve 30 allows the waste discharge port 5 to drain water in one direction only. The one-way check valve 30 can be any type of one-way check valve known in the art or that may appear in the future. The one-way check valve 30 limits the direction of water flow and can effectively prevent the water or other substances downstream of the waste discharge port 5 from flowing back to the reversing valve 4 and the water circuit system, ensuring the one-way flow of water in the water circuit and ensuring the hygiene and normal operation of the entire water purifier water circuit structure.

[0063] As a preferred embodiment of this application, such as Figure 3 and Figure 5 As shown, the water purifier's water circuit structure also includes a control circuit board 40. The control circuit board 40 is equipped with a timed shutdown module. This module controls the pressure relief outlet 42 to close after it has been kept open for a preset time. Specifically, the timed shutdown module needs to: when the pressure relief outlet 42 is open, if the continuous opening time reaches a preset duration (e.g., 1-5 minutes), satisfying the requirement that the water pressure released due to residual pressure in the system has been largely drained, then forcibly close the pressure relief outlet 42, thereby switching to the open state of the water supply outlet 41, ready for the next water supply. The timer module needs to read the flow switch status in real time to ensure that the timing is only activated in pressure relief mode. The timed shutdown module can use a microcontroller with a built-in timer or an external timing chip. Furthermore, in embodiments where the waste discharge interface 5 is connected to the municipal sewer inlet, controlling the timed closure of the pressure relief outlet 42 via the timed shutdown module helps prevent odors from the municipal sewer from seeping into the system.

[0064] For any parts not mentioned in this application, existing technologies may be used or referenced.

[0065] 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.

[0066] 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 water circuit structure, comprising a filter element and an integrated water circuit board, characterized in that, The integrated water circuit board integrates a flow detection device and a reversing valve. The inlet end of the reversing valve is connected to the pure water outlet of the filter element. One outlet end of the reversing valve is configured to be connected to the water supply outlet of the water purifier. The other outlet end of the reversing valve is configured to be connected to the waste discharge outlet of the water purifier. The flow detection device is signal-connected to and controls the valve core of the reversing valve to switch the water flow path by changing the opening and closing state of the water supply outlet and the pressure relief outlet. When the flow detection device detects a water supply flow signal, it controls the reversing valve to open the water supply outlet and close the pressure relief outlet, thereby forming a water supply path to the water supply interface; when the flow detection device detects a stop water supply flow signal, it controls the reversing valve to close the water supply outlet and open the pressure relief outlet, thereby forming a pressure relief path to the waste discharge interface.

2. The water circuit structure of the water purifier according to claim 1, characterized in that, The integrated water circuit board is provided with a water supply channel for the water source to be filtered to supply water to the filter element. The flow detection device is connected to the water supply channel and controls the valve core of the reversing valve to operate by detecting the flow rate of the water in the water supply channel.

3. The water purifier water circuit structure according to claim 2, characterized in that, The flow detection device is a mechanical flow switch. The mechanical flow switch is set with a trigger flow threshold. When the flow rate in the water supply channel is greater than the trigger flow threshold, the reversing valve is triggered to open the water supply outlet and close the pressure relief outlet. When the flow rate in the water supply channel is less than or equal to the trigger flow threshold, the reversing valve is triggered to close the water supply outlet and open the pressure relief outlet.

4. The water circuit structure of the water purifier according to claim 2, characterized in that, A water outlet valve is provided on the fluid path from the water source to the water supply channel, and the flow rate of the water in the water supply channel is controlled by operating the opening and closing of the water outlet valve.

5. The water circuit structure of the water purifier according to claim 1, characterized in that, The pressure relief outlet is connected to the waste discharge port through a pressure relief pipeline, and the back pressure value of the pressure relief pipeline is less than the back pressure value of the water supply outlet.

6. The water purifier water circuit structure according to claim 5, characterized in that, The waste discharge port is connected to the municipal sewer inlet, the water supply port is set as a water outlet bend, and the waste discharge port is lower than the water supply outlet.

7. The water circuit structure of the water purifier according to claim 1, characterized in that, The water purifier's water circuit structure includes an upper shell and a base. The upper shell and the base are detachably fitted to form a filter cartridge receiving cavity, in which the filter cartridge is placed. The base is provided with a water circuit board receiving cavity, in which the integrated water circuit board is placed.

8. The water circuit structure of the water purifier according to claim 7, characterized in that, The integrated water circuit board is provided with an inlet connector and an outlet connector that extend upward through the filter element housing cavity. The inlet connector is connected to the water inlet of the filter element, and the outlet connector is connected to the pure water outlet of the filter element. The bottom of the base is open, and the flow detection device and the reversing valve are installed at the bottom of the integrated water circuit board through the open.

9. The water circuit structure of the water purifier according to claim 1, characterized in that, The waste discharge port is equipped with a one-way check valve, and the opening direction of the one-way check valve allows the waste discharge port to drain water outward in one direction only.

10. The water circuit structure of the water purifier according to claim 1, characterized in that, The water purifier's water circuit structure also includes a control circuit board, which is equipped with a timed shutdown module. The timed shutdown module controls the pressure relief outlet to close after the pressure relief outlet has been kept open for a preset time.

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