Waterway board and water purifier

Abstract

The utility model provides a waterway board and a water purifier. A first fixing part and a second fixing part are arranged on one side of the waterway plate, and a third fixing part is arranged on the other side of the waterway plate. When the whole water purifier is assembled, the PCB composite filter element, the RO filter element and the rear activated carbon filter element can be detachably installed on the water path plate through the first fixing part, the second fixing part and the third fixing part respectively and correspondingly communicate with the water path plate, the rear activated carbon filter element does not need to be independently assembled and fixed, and therefore the water purifier is convenient to assemble and disassemble. The PCB composite filter element and the RO filter element as well as the RO filter element and the rear activated carbon filter element are communicated through the waterway plates while the filter element assembly efficiency of the water purifier is improved, so that the use of materials such as communicating pipes and adapters can be reduced, and the cost of the water purifier is reduced.

Description

Technical Field

[0001] This utility model relates to the field of water purification equipment technology, and in particular to a water circuit board and a water purifier. Background Technology

[0002] As people's living standards improve, consumers are paying more and more attention to drinking water health. Public places such as airports, high-speed rail stations, and park drinking fountains are increasingly equipped with professional large-scale commercial water purifiers. The core components of the filtration and purification system of commercial water purifiers are PCB composite filters, RO reverse osmosis filters, and post-activated carbon filters. However, in order to control the overall size, existing water purifiers have limited internal space, making assembly inconvenient and inefficient. Utility Model Content

[0003] Therefore, it is necessary to provide a water circuit board and a water purifier to address the problems of inconvenient operation and low assembly efficiency in the assembly of existing water purifiers.

[0004] The technical solution is as follows:

[0005] On one hand, a water circuit board is provided for installing a PCB composite filter element, an RO reverse osmosis filter element, and a post-activated carbon filter element. The water circuit board has a first fixing part and a second fixing part on one side and a third fixing part on the other side. The water circuit board is configured to communicate with the PCB composite filter element, the RO reverse osmosis filter element, and the post-activated carbon filter element when the PCB composite filter element is detachably installed in the first fixing part, the RO reverse osmosis filter element is detachably installed in the second fixing part, and the post-activated carbon filter element is detachably installed in the third fixing part.

[0006] The technical solution will be further explained below:

[0007] In one embodiment, the third fixing part includes a support frame for supporting and fixing the post-activated carbon filter element.

[0008] In one embodiment, the support frame has a slot on the side away from the water channel plate, and the opposite sides of the slot extend to the opposite sides of the support frame, and the post-activated carbon filter element passes through the slot and is interference-fitted with the slot.

[0009] In one embodiment, the third fixing part further includes a mounting bracket spaced apart from the support frame. The mounting bracket has a mounting groove on the side near the support frame, and one side of the mounting groove extends to the side of the mounting bracket away from the water circuit plate. The bottom wall of the mounting groove has a first water outlet channel. The first water outlet channel is configured to be inserted and connected with the first water outlet when the end of the post-activated carbon filter element with the first water outlet is installed in the mounting groove.

[0010] In one embodiment, the third fixing part further includes a reinforcing rib, which is located between the support frame and the mounting frame, and is connected to the support frame, the support frame and the water channel plate.

[0011] In one embodiment, the PCB composite filter element is provided with a first water inlet and a second water outlet, and the water circuit board is provided with a first water inlet channel and a second water outlet channel. One end of the first water inlet channel is used to communicate with an external water source, and the other end is configured to communicate with the first water inlet when the PCB composite filter element is installed on the first fixing part. One end of the second water outlet channel is configured to communicate with the second water outlet when the PCB composite filter element is installed on the first fixing part, and the other end is used to communicate with the water inlet of the pressure stabilizing pump.

[0012] In one embodiment, the water circuit board is further provided with an installation port communicating with the second water outlet channel, the installation port being used to install a pressure detection element.

[0013] In one embodiment, the RO reverse osmosis filter element is provided with a second inlet, a third outlet for wastewater discharge, and a fourth outlet for filtered water discharge. The post-activated carbon filter element is provided with a third inlet. The water circuit board is provided with a second inlet channel, a third outlet channel, and a fourth outlet channel. One end of the second inlet channel is used to connect with the outlet of the pressure stabilizing pump, and the other end is configured to connect with the second inlet when the RO reverse osmosis filter element is installed on the second fixing part. One end of the third outlet channel is configured to connect with the third outlet when the RO reverse osmosis filter element is installed on the second fixing part. One end of the fourth outlet channel is configured to connect with the fourth outlet when the RO reverse osmosis filter element is installed on the second fixing part, and the other end is used to connect with the third inlet.

[0014] On the other hand, a water purifier is provided, including a PCB composite filter element, an RO reverse osmosis filter element, a post-activated carbon filter element, and the water circuit board, wherein the PCB composite filter element, the RO reverse osmosis filter element, and the post-activated carbon filter element are all installed on the water circuit board.

[0015] In one embodiment, the water purifier further includes a pressure detection device mounted on the water circuit board and used to detect the pressure at the second outlet of the PCB composite filter element.

[0016] In the above embodiments, the water circuit board and water purifier allow the PCB composite filter, RO reverse osmosis filter, and post-activated carbon filter to be detachably installed on the water circuit board via the first fixing part, the second fixing part, and the third fixing part, respectively, and to be connected to the water circuit board. This eliminates the need for separate assembly and fixing of the post-activated carbon filter, facilitating the installation and fixing of the three filters within the relatively small space inside the water purifier. This improves the filter assembly efficiency of the water purifier. Furthermore, the water circuit board connects the PCB composite filter to the RO reverse osmosis filter and the RO reverse osmosis filter to the post-activated carbon filter, reducing the use of connecting pipes, adapters, and other materials, thus lowering the cost of the water purifier. Attached Figure Description

[0017] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments of this application and their descriptions are used to explain this application and do not constitute an undue limitation of this application.

[0018] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of a PCB composite filter element, an RO reverse osmosis filter element, and a post-activated carbon filter element installed on a water circuit board, as shown in one embodiment.

[0020] Figure 2 for Figure 1 Exploded view of the PCB composite filter element, RO reverse osmosis filter element, post-activated carbon filter element and water circuit board.

[0021] Figure 3 for Figure 1 A schematic diagram of the water channel plate.

[0022] Figure 4 for Figure 3 A schematic diagram of the water channel plate from another perspective.

[0023] Figure 5 for Figure 1 A magnified view of part A in the middle.

[0024] Explanation of reference numerals in the attached figures:

[0025] 100. Water circuit board; 110. First fixing part; 120. Second fixing part; 130. Third fixing part; 131. Support frame; 132. Slot; 133. Mounting bracket; 134. Mounting groove; 135. First water outlet channel; 136. Reinforcing rib; 140. Mounting port; 200. PCB composite filter element; 210. Filter element fin protrusion; 300. RO reverse osmosis filter element; 400. Post-activated carbon filter element; 410. First water outlet; 500. Pressure detection element. Detailed Implementation

[0026] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0027] To address the problem that existing water purifiers, in order to control the overall size, have limited internal space, making assembly inconvenient and inefficient, the inventors, through testing and analysis, discovered that, generally, filter cartridges are packaged separately. During assembly, filter cartridge assembly is not involved, but pre-installed PE pipes and adapters for connecting the filter cartridges to the water circuit are provided. Only when the machine is in use will after-sales installation personnel install the filter cartridges, placing the three cartridges separately onto different water circuit boards and connecting them through pipes. However, due to the limited internal space, it is often difficult to manually insert and remove the pipes after installing the filter cartridges, resulting in time-consuming and laborious process.

[0028] Current filter installation methods sometimes combine the RO reverse osmosis filter and the PCB composite filter into a single integrated water circuit board, eliminating the need for pipe insertion. However, the post-activated carbon filter still requires a pipe connection to the purification system. This is because commercial water purifiers often have intricately coiled corrugated pipes, and the internal space is limited to control overall size, making the insertion of the post-activated carbon filter quite difficult.

[0029] Based on the above problems, the inventors designed and proposed the water circuit board 100 and water purifier according to the following embodiments of this application to solve the above technical problems.

[0030] like Figure 1 , Figure 2 ,and Figure 3As shown, in one embodiment, a water channel plate 100 is provided for mounting a PCB composite filter element 200, an RO reverse osmosis filter element 300, and a post-activated carbon filter element 400. A first fixing portion 110 and a second fixing portion 120 are provided on one side of the water channel plate 100, and a third fixing portion 130 is provided on the other side. The water channel plate 100 is configured to communicate with the PCB composite filter element 200, the RO reverse osmosis filter element 300, and the post-activated carbon filter element 400 when the PCB composite filter element 200 is detachably mounted to the first fixing portion 110, the RO reverse osmosis filter element 300 is detachably mounted to the second fixing portion 120, and the post-activated carbon filter element 400 is detachably mounted to the third fixing portion 130.

[0031] In the above embodiment, when in use, the PCB composite filter element 200, the RO reverse osmosis filter element 300, and the post-activated carbon filter element 400 can be detachably installed on the water circuit board 100 through the first fixing part 110, the second fixing part 120, and the third fixing part 130, respectively, and are correspondingly connected to the water circuit board 100. There is no need to assemble and fix the post-activated carbon filter element 400 separately, which facilitates the installation and fixing of the three filter elements in the small space inside the water purifier. This improves the filter element assembly efficiency of the water purifier. At the same time, the PCB composite filter element 200 and the RO reverse osmosis filter element 300, as well as the RO reverse osmosis filter element 300 and the post-activated carbon filter element 400, are connected through the water circuit board 100, which can reduce the use of connecting pipes, adapters, and other materials, and reduce the cost of the water purifier.

[0032] The instruction manual specifies that the connecting pipe between the RO reverse osmosis filter 300 and the post-activated carbon filter 400 should be designated as the first pipe. One end of the first pipe can be pre-connected to the outlet channel within the water circuit board 100, which connects to the filtered water outlet of the RO reverse osmosis filter 300. The other end can be connected to the inlet of the post-activated carbon filter 400 during installation. This allows the installation method of the first pipe to be changed from insertion to a single connection during assembly, reducing the difficulty of filter assembly and improving the practicality of the water circuit board 100.

[0033] The detachable installation method between the PCB composite filter element 200 and the first fixing part 110 can adopt any existing method for detachable fixed connection between the PCB composite filter element 200 and the water circuit board 100. The detachable installation method between the RO reverse osmosis filter element 300 and the second fixing part 120 can adopt any existing method for detachable fixed connection between the RO reverse osmosis filter element 300 and the water circuit board 100. The post-activated carbon filter element 400 can be installed on the third fixing part 130 by snap-fit, plug-in, or other detachable fixed connection methods.

[0034] Specifically, in this embodiment, the water channel plate 100 is integrally formed with the first fixing part 110, the second fixing part 120 and the third fixing part 130.

[0035] like Figure 4 and Figure 5 Specifically, in this embodiment, filter element fin protrusions 210 are provided on both sides of the PCB composite filter element 200 near the first fixing part 110 and on both sides of the RO reverse osmosis filter element near the second fixing part 120. The structure of the first fixing part 110 is the same as that of the second fixing part 120, and both are set as knob-type locking structures. Taking the detachable installation of the PCB composite filter element 200 and the first fixing part 110 as an example, during assembly, the filter element fin protrusions 210 are offset from the knob-type locking structure. After inserting the PCB composite filter element 200 into the corresponding position on the water circuit board 100, it is then rotated counterclockwise to screw the filter element fin protrusions 210 into the knob-type locking structure, thus completing the installation.

[0036] like Figure 3 and Figure 4 As shown, the third fixing part 130 further includes a support frame 131, which is used to support and fix the post-activated carbon filter element 400.

[0037] like Figure 4 As shown, optionally, the support frame 131 has a slot 132 on the side away from the water channel plate 100, and the opposite sides of the slot 132 extend to the opposite sides of the support frame 131. The post-activated carbon filter element 400 passes through the slot 132 and is interference-fitted with the slot 132. In this way, the post-activated carbon filter element 400 can be fixed by correspondingly snapping into the slot 132 during assembly, improving the practicality of the water channel plate 100.

[0038] Specifically, in this embodiment, the inner wall of the slot 132 is set as an arc surface. Along the depth direction of the slot 132, the width of the slot 132 first increases and then decreases. The width of the slot opening of the slot 132 is smaller than the outer diameter of the post-activated carbon filter element 400, so that the opposite sides of the slot opening of the slot 132 can be matched with the outer side wall of the post-activated carbon filter element 400 when the post-activated carbon filter element 400 is installed in the slot 132.

[0039] like Figure 3 and Figure 4As shown, in one embodiment, the third fixing part 130 further includes a mounting bracket 133 spaced apart from the support frame 131. The mounting bracket 133 has a mounting groove 134 on the side near the support frame 131, and one side of the mounting groove 134 extends to the side of the mounting bracket 133 away from the water circuit board 100. The bottom wall of the mounting groove 134 has a first water outlet channel 135. The first water outlet channel 135 is configured to engage and communicate with the first water outlet 410 when one end of the post-activated carbon filter element 400 with the first water outlet 410 is installed in the mounting groove 134. Thus, the mounting bracket 133 can also support and limit the post-activated carbon filter element 400, ensuring that the post-activated carbon filter element 400 can be stably and reliably fixed on the water circuit board 100, improving the reliability of the water circuit board 100.

[0040] It should be noted that the inlet and outlet of the post-activated carbon filter 400 adopts a quick-connect 2-point pipe design, so as long as the first outlet 410 is aligned with the first outlet channel 135 of the water circuit board 100, the installation can be completed directly.

[0041] Specifically, in this embodiment, the first fixing part 110 and the support frame 131 are located on opposite sides of the water channel plate 100. Along the spacing direction between the support frame 131 and the mounting frame 133, the first fixing part 110 and the second fixing part 120 are located on opposite sides of the support frame 131. (See reference...) Figure 1 From the perspective of the water circuit board 100, the PCB composite filter element 200 and the RO reverse osmosis filter element 300 are both vertically suspended below the water circuit board 100, and the post-activated carbon filter element 400 is horizontally fixed above the water circuit board 100. The PCB composite filter element 200, the RO reverse osmosis filter element 300, the post-activated carbon filter element 400 and the water circuit board 100 are arranged in a compact manner.

[0042] like Figure 4 As shown, optionally, the third fixing part 130 further includes a reinforcing rib 136, which is located between the support frame 131 and the mounting frame 133, and is connected to the support frame 131 and the water circuit plate 100. Thus, the reinforcing rib 136 can improve the strength of the support frame 131 and the mounting frame 133, ensuring that the support frame 131 and the mounting frame 133 can cooperate to fix the post-activated carbon filter element 400, thereby improving the reliability of the water circuit plate 100.

[0043] The number, position, and shape of the reinforcing ribs 136 can be flexibly adjusted according to the actual needs of use.

[0044] In one embodiment, the PCB composite filter element 200 has a first inlet and a second outlet, and the water circuit board 100 has a first inlet channel and a second outlet channel. One end of the first inlet channel is used to connect to an external water source, and the other end is configured to connect to the first inlet when the PCB composite filter element 200 is installed on the first fixing part 110. One end of the second outlet channel is configured to connect to the second outlet when the PCB composite filter element 200 is installed on the first fixing part 110, and the other end is used to connect to the inlet of the pressure stabilizing pump. Thus, the pipeline connected to the PCB composite filter element 200 can be pre-installed on the water circuit board 100. When the PCB composite filter element 200 is detachably and fixedly connected to the first fixing part 110, the PCB composite filter element 200 is also connected to the corresponding device, improving the assembly efficiency of the filter element.

[0045] like Figure 1 and Figure 3 As shown, optionally, the water circuit board 100 is also provided with an installation port 140 communicating with the second water outlet channel. The installation port 140 is used to install the pressure detection element 500. In this way, the pressure detection element 500 can detect the pressure at the second water outlet of the PCB composite filter element 200, and thus the pressure detection result of the pressure detection element 500 can be used to determine whether the pressure of the water circuit system of the water purifier is normal, and thereby indirectly determine whether the filter element is installed properly, improving the practicality of the water purifier.

[0046] Optionally, the RO reverse osmosis filter element 300 is provided with a second inlet, a third outlet for wastewater discharge, and a fourth outlet for filtered water discharge. The post-activated carbon filter element 400 is provided with a third inlet. The water circuit board 100 is provided with a second inlet channel, a third outlet channel, and a fourth outlet channel. One end of the second inlet channel is used to connect with the outlet of the pressure stabilizing pump, and the other end is configured to connect with the second inlet when the RO reverse osmosis filter element 300 is installed in the second fixing part 120. One end of the third outlet channel is configured to connect with the third outlet when the RO reverse osmosis filter element 300 is installed in the second fixing part 120. One end of the fourth outlet channel is configured to connect with the fourth outlet when the RO reverse osmosis filter element 300 is installed in the second fixing part 120, and the other end is used to connect with the third inlet. In this way, the pipeline connected to the RO reverse osmosis filter element 300 can be pre-installed on the water circuit board 100. When the RO reverse osmosis filter element 300 is detachably and fixedly connected to the second fixing part 120, the RO reverse osmosis filter element 300 is also connected to the corresponding device, improving the assembly efficiency of the filter element.

[0047] Specifically, in this embodiment, the end of the fourth water outlet channel away from the RO reverse osmosis filter element 300 is connected to the end of the first pipe away from the post-activated carbon filter element 400.

[0048] In one embodiment, a water purifier is provided, including a PCB composite filter element 200, an RO reverse osmosis filter element 300, a post-activated carbon filter element 400, and a water circuit board 100 in any of the above embodiments, wherein the PCB composite filter element 200, the RO reverse osmosis filter element 300, and the post-activated carbon filter element 400 are all installed on the water circuit board 100.

[0049] In the water purifier described in the above embodiments, the PCB composite filter element 200, the RO reverse osmosis filter element 300, and the post-activated carbon filter element 400 can be detachably installed on the water circuit board 100 through the first fixing part 110, the second fixing part 120, and the third fixing part 130, respectively, and are correspondingly connected to the water circuit board 100. There is no need to assemble and fix the post-activated carbon filter element 400 separately, which facilitates the installation and fixing of the three filter elements in the small space inside the water purifier. This improves the filter element assembly efficiency of the water purifier. At the same time, the PCB composite filter element 200 and the RO reverse osmosis filter element 300, as well as the RO reverse osmosis filter element 300 and the post-activated carbon filter element 400, are connected through the water circuit board 100, which reduces the use of connecting pipes, adapters, and other materials, and lowers the cost of the water purifier.

[0050] like Figure 2 As shown, optionally, the water purifier also includes a pressure detection element 500, which is installed on the water circuit board 100 and used to detect the pressure at the second outlet of the PCB composite filter element 200.

[0051] Optionally, the water purifier also includes a central processing unit and an inlet solenoid valve. The inlet solenoid valve is connected to the first inlet channel. The central processing unit is communicatively connected to both the pressure detection element 500 and the inlet solenoid valve. Thus, the central processing unit can determine whether the water pressure changes in the entire pipeline are within the normal pressure range based on the feedback from the pressure detection element 500, thereby determining whether there is a leak in the water circulation system and improving the practicality of the water purifier.

[0052] The central processing unit (CPU) can be configured as a microcontroller or other control structure. The pressure sensing element 500 can be configured as a high / low pressure switch sensor or other pressure sensing device. The CPU can communicate with both the pressure sensing element 500 and the inlet solenoid valve via cable, data cable, Bluetooth, wireless communication network technology, or other communication methods.

[0053] Specifically, if the pressure detected by pressure sensor 500 is lower than the first predetermined nominal value, it indicates that there is no water flow at the location of pressure sensor 500 or a leak has occurred ahead. Pressure sensor 500 sends an abnormal signal to the central processing unit (CPU). The CPU, based on the abnormal signal, controls the inlet solenoid valve to close immediately to shut down the system and alerts maintenance personnel for timely repairs. If the pressure detected by pressure sensor 500 is higher than the second predetermined nominal value, it indicates that water is flowing at the location of pressure sensor 500 and there is no leak or pressure drop ahead. The second predetermined nominal value is greater than the first predetermined nominal value.

[0054] The values ​​of the first and second predetermined nominal values ​​can be flexibly adjusted according to actual usage needs. Specifically, the range of the first predetermined nominal value can be 0.15 ± 0.05 MPa, and the range of the second predetermined nominal value can be 0.25 ± 0.05 MPa.

[0055] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and 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, and therefore should not be construed as a limitation of this application.

[0056] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0057] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," 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 or an electrical 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, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0058] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0059] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0060] It should also be understood that, in interpreting the connection or positional relationships of components, although not explicitly described, connection and positional relationships are interpreted to include a range of error, which should be within the acceptable deviation range of a specific value as determined by a person skilled in the art. For example, "approximately," "about," or "substantially" can mean within one or more standard deviations, without limitation herein.

[0061] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0062] The above embodiments merely illustrate several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A water circuit board for mounting a PCB composite filter element (200), an RO reverse osmosis filter element (300), and a post-activated carbon filter element (400), characterized in that, The water circuit board (100) has a first fixing part (110) and a second fixing part (120) on one side, and a third fixing part (130) on the other side. The water circuit board (100) is configured to be in communication with the PCB composite filter element (200), the RO reverse osmosis filter element (300) and the post-activated carbon filter element (400) when the PCB composite filter element (200) is detachably installed in the first fixing part (110), the RO reverse osmosis filter element (300) is detachably installed in the second fixing part (120) and the post-activated carbon filter element (400) is detachably installed in the third fixing part (130).

2. The water channel plate according to claim 1, characterized in that, The third fixing part (130) includes a support frame (131) for supporting and fixing the post-activated carbon filter element (400).

3. The water channel plate according to claim 2, characterized in that, The support frame (131) has a slot (132) on the side away from the water channel plate (100). The opposite sides of the slot (132) extend to the opposite sides of the support frame (131). The post-activated carbon filter element (400) passes through the slot (132) and is press-fitted with the slot (132).

4. The water channel plate according to claim 2, characterized in that, The third fixing part (130) also includes a mounting bracket (133) spaced apart from the support frame (131). The mounting bracket (133) has a mounting groove (134) on the side near the support frame (131). One side of the mounting groove (134) extends to the side of the mounting bracket (133) away from the water circuit plate (100). The bottom wall of the mounting groove (134) is provided with a first water outlet channel (135). The first water outlet channel (135) is configured to be inserted and connected with the first water outlet (410) when one end of the post-activated carbon filter element (400) with a first water outlet (410) is installed in the mounting groove (134).

5. The water channel plate according to claim 4, characterized in that, The third fixing part (130) also includes a reinforcing rib (136), which is located between the support frame (131) and the mounting frame (133) and is connected to the support frame (131), the support frame (131) and the water channel plate (100).

6. The water channel plate according to any one of claims 1 to 5, characterized in that, The PCB composite filter element (200) is provided with a first water inlet and a second water outlet. The water circuit board (100) is provided with a first water inlet channel and a second water outlet channel. One end of the first water inlet channel is used to connect with an external water source, and the other end is configured to connect with the first water inlet when the PCB composite filter element (200) is installed on the first fixing part (110). One end of the second water outlet channel is configured to connect with the second water outlet when the PCB composite filter element (200) is installed on the first fixing part (110), and the other end is used to connect with the water inlet of the pressure stabilizing pump.

7. The water channel plate according to claim 6, characterized in that, The water circuit board (100) is also provided with an installation port (140) that communicates with the second water outlet channel. The installation port (140) is used to install a pressure detection element (500).

8. The water channel plate according to any one of claims 1 to 5, characterized in that, The RO reverse osmosis filter element (300) is provided with a second inlet, a third outlet for wastewater discharge, and a fourth outlet for filtered water discharge. The post-activated carbon filter element (400) is provided with a third inlet. The water circuit board (100) is provided with a second inlet channel, a third outlet channel, and a fourth outlet channel. One end of the second inlet channel is used to connect with the outlet of the pressure stabilizing pump, and the other end is configured to connect with the second inlet when the RO reverse osmosis filter element (300) is installed on the second fixing part (120). One end of the third outlet channel is configured to connect with the third outlet when the RO reverse osmosis filter element (300) is installed on the second fixing part (120). One end of the fourth outlet channel is configured to connect with the fourth outlet when the RO reverse osmosis filter element (300) is installed on the second fixing part (120), and the other end is used to connect with the third inlet.

9. A water purifier, characterized in that, The device includes a PCB composite filter element (200), an RO reverse osmosis filter element (300), a post-activated carbon filter element (400), and a water circuit board (100) as described in any one of claims 1 to 8, wherein the PCB composite filter element (200), the RO reverse osmosis filter element (300), and the post-activated carbon filter element (400) are all installed on the water circuit board (100).

10. The water purifier according to claim 9, characterized in that, The water purifier also includes a pressure detection element (500), which is installed on the water circuit board (100) and used to detect the pressure at the second outlet of the PCB composite filter element (200).

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