Wastewater flow restriction device and drinking water purification equipment

Abstract

This application relates to a wastewater flow limiting device and a drinking water purification device, applicable to the field of drinking water purification equipment. It includes a housing, a cover, and a scale inhibitor. The housing includes an inlet, an outlet, and a flow limiting orifice. The cover is connected to the housing and defines a purification flow channel between the cover and the housing, allowing the wastewater to contact the scale inhibitor. The purification flow channel connects the inlet and the outlet. The flow limiting orifice connects the outlet and the purification flow channel, and the flow cross-sectional area of ​​the flow limiting orifice is smaller than the flow cross-sectional area of ​​the purification flow channel. The scale inhibitor is filled within the purification flow channel. This application fills the purification flow channel with a scale inhibitor. When wastewater flows through, the scale inhibitor reacts with calcium, magnesium, and other easily scale-forming ions in the wastewater, preventing scale formation and improving the long-term stable operation of the device in complex water quality environments. This avoids flow control failure and frequent maintenance problems caused by scaling. The flow limiting orifice effectively prolongs the contact time between the water flow and the scale inhibitor, allowing for a more complete scale inhibition reaction and improving descaling efficiency.

Description

Technical Field

[0001] This application relates to the field of drinking water purification equipment, and in particular to a wastewater flow limiting device and drinking water purification equipment. Background Technology

[0002] In various water systems, wastewater flow limiting structures are usually installed at the wastewater outlet of the water circuit board. Their core function is to precisely control the flow rate of wastewater discharged from the system. By designing flow limiting orifices, they balance the water circuit pressure and ensure that the entire water system operates stably according to preset flow parameters. They are one of the key components for maintaining the normal operation of the water system.

[0003] However, most wastewater flow limiting devices on the market currently only have basic flow limiting functions. Since wastewater often contains scale-forming ions such as calcium and magnesium, these ions tend to deposit on the inner wall of the flow limiting orifice during long-term use, forming scale and causing the orifice to gradually narrow or even become completely blocked. Utility Model Content

[0004] Therefore, it is necessary to provide a wastewater flow limiting device and a drinking water purification equipment to address the problem that scale deposits easily form at the flow limiting orifice of the wastewater flow limiting device, which affects the stable operation of the water system.

[0005] Firstly, this application provides a wastewater flow limiting device, which adopts the following technical solution:

[0006] A wastewater flow limiting device is provided for the wastewater path of a filter element. The wastewater flow limiting device includes at least a housing, a cover, and a scale inhibitor. The housing includes an inlet, an outlet, and a flow limiting orifice, with the inlet and outlet spaced apart. The cover is connected to the housing and defines a purification channel between the cover and the housing for contact between the wastewater and the scale inhibitor. The purification channel connects the inlet and the outlet. The flow limiting orifice connects the outlet and the purification channel, and the flow cross-sectional area of ​​the flow limiting orifice is smaller than the flow cross-sectional area of ​​the purification channel. The scale inhibitor is filled within the purification channel.

[0007] In one embodiment, the wastewater flow limiting device further includes a barrier element having a plurality of spaced flow gaps that connect the flow limiting orifice and the purification channel, and the width of the flow gaps is smaller than the diameter of the scale inhibitor.

[0008] In one embodiment, the wastewater flow limiting device further includes at least two blocking elements, which are fixed to the inner wall of the housing and spaced apart along the periphery of the flow limiting hole. A flow gap is formed between adjacent blocking elements to allow water to flow through, and the width of the flow gap is smaller than the diameter of the scale inhibitor.

[0009] In one embodiment, the wastewater flow limiting device includes a partition disposed within the housing, the partition being fixed to the inner wall of the housing so that the purification flow channel extends in a "C" shape.

[0010] In one embodiment, the wastewater flow limiting device includes a plurality of partitions disposed within the housing, with two adjacent partitions respectively fixed to the two opposing inner walls of the housing and the cover, so that the purification flow channel extends in a serpentine shape.

[0011] In one embodiment, the wastewater flow limiting device further includes a check valve installed in the housing, the check valve being located between the inlet and the scale inhibitor, for controlling the unidirectional flow of wastewater from the inlet to the outlet.

[0012] In one embodiment, the wastewater flow limiting device further includes a plurality of connectors disposed between the housing and the cover, all of which are spaced apart circumferentially along the housing, and the connectors are used to fix the cover to the housing.

[0013] In one embodiment, the connector includes a locking part, a first connecting part, and a second connecting part. The first connecting part is fixed to the cover, and the second connecting part is fixed to the housing. Along the assembly direction of the cover and the housing, the locking part passes through and connects between the first connecting part and the second connecting part.

[0014] In one embodiment, the wastewater flow limiting device further includes a seal installed between the housing and the cover, such that the cover is sealed to the housing.

[0015] Secondly, this application provides a water purification device, which adopts the following technical solution:

[0016] A drinking water purification device includes a water circuit board and the aforementioned wastewater flow limiting device. The water circuit board has a wastewater inlet and a wastewater outlet spaced apart. The wastewater flow limiting device is installed on the water circuit board and connected between the wastewater inlet and the wastewater outlet of the water circuit board.

[0017] The aforementioned wastewater flow limiting device, by filling the purification channel with scale inhibitor, allows the scale inhibitor to react with calcium, magnesium, and other scale-forming ions in the wastewater as it flows through, preventing scale formation. This enhances the device's long-term stable operation in complex water quality environments and avoids flow control failures and frequent maintenance issues caused by scaling. Furthermore, the flow limiting orifice, while balancing water pressure, effectively extends the contact time between the water flow and the scale inhibitor, resulting in a more complete scale inhibition reaction and improved descaling efficiency. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the assembly of the wastewater flow limiting device in one embodiment of this application.

[0019] Figure 2 This is a three-dimensional structural diagram of a wastewater flow limiting device in one embodiment of this application.

[0020] Figure 3 This is a cross-sectional schematic diagram of a wastewater flow limiting device in one embodiment of this application.

[0021] Figure 4 This is a cross-sectional view of the wastewater flow limiting device from another angle in one embodiment of this application.

[0022] Figure 5 This is a schematic diagram of the water flow inside the wastewater flow limiting device in one embodiment of this application.

[0023] Attached image annotations:

[0024] 1. Shell; 11. Inlet connector; 111. Inlet; 12. Outlet connector; 121. Outlet; 2. Cover; 3. Divider; 4. Check valve; 5. Purification channel; 6. Flow limiting hole; 71. Locking part; 72. First connection part; 73. Second connection part; 8. Seal; 9. Scale inhibitor; 10. Fixing part; 13. Barrier part; 14. Flow gap. Detailed Implementation

[0025] 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.

[0026] 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.

[0027] 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.

[0028] 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.

[0029] 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.

[0030] 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.

[0031] The following is in conjunction with the appendix Figure 1-5 The embodiments of this application will be described in further detail.

[0032] See Figure 1 , Figure 1A schematic diagram of the assembly of a wastewater flow limiting device according to an embodiment of this application is shown. An embodiment of this application provides a water purification device, including at least a water circuit board (not shown) and a wastewater flow limiting device installed on the water circuit board. The water circuit board includes a wastewater inlet and a wastewater outlet spaced apart, and the wastewater flow limiting device is installed on the water circuit board and connected between the wastewater inlet and the wastewater outlet of the water circuit board.

[0033] In the actual water production process, wastewater enters from the wastewater inlet of the water circuit board and is discharged from the wastewater outlet of the water circuit board after passing through the wastewater flow restriction device. The wastewater flow restriction device is used to regulate the flow rate of wastewater discharged by the system in order to maintain the normal operation of the water circuit system.

[0034] Furthermore, the wastewater flow limiting device is equipped with a fixing component 10, which has a threaded hole. After the wastewater flow limiting device is installed on the water circuit board and the water circuit connection is completed, it is tightly locked to the water circuit board by screws or bolts passing through the threaded hole on the fixing component 10, thereby achieving a stable connection between the wastewater flow limiting device and the water circuit board, making the water circuit structure more stable.

[0035] In this embodiment, only one implementation method is used as an example for illustration. It is understood that in other embodiments, the wastewater flow limiting device can also achieve a stable connection with the water circuit board by means of other structures, which will not be described in detail here.

[0036] Combination Figure 2 and Figure 3 As shown, Figure 2 This invention provides a three-dimensional structural schematic diagram of a wastewater flow limiting device according to an embodiment of the present application. Figure 3 A cross-sectional schematic diagram of a wastewater flow limiting device in one embodiment of this application is shown.

[0037] In some embodiments, the wastewater flow limiting device includes a housing 1 and a cover 2 installed on the housing 1. The cover 2 and the housing 1 can be fixedly connected by spin-fusion or adhesive. In other embodiments, the cover 2 and the housing 1 can also be detachably connected.

[0038] In this embodiment, the wastewater flow limiting device includes multiple connectors disposed between the cover 2 and the housing 1. All connectors are distributed at intervals along the circumference of the housing 1, preferably evenly distributed along the circumference of the housing 1, thereby stably fixing the cover 2 to the housing 1.

[0039] Specifically, the connector includes a locking part 71, a first connecting part 72, and a second connecting part 73. The first connecting part 72 is a block-shaped connecting structure fixed to the cover 2, and the second connecting part 73 is also a block-shaped connecting structure fixed to the housing 1. The locking part 71 can be a screw or bolt structure. Along the assembly direction of the cover 2 and the housing 1, the locking part 71 passes through and connects between the first connecting part 72 and the second connecting part 73, thereby locking the cover 2 to the housing 1 to complete a stable and detachable connection between the cover 2 and the housing 1.

[0040] Furthermore, in some embodiments, the wastewater flow limiting device also includes a sealing element 8, which may specifically be a sealing ring made of a flexible material such as rubber or silicone. A groove (not shown) is formed at the junction of the housing 1 and the cover 2 for the installation of the sealing element 8. After the cover 2 is installed onto the housing 1, the sealing element 8 is pressed against the cover 2 and the housing 1 to improve the sealing performance at the connection between the cover 2 and the housing 1.

[0041] See Figure 3 As shown, the housing 1 includes an inlet connector 11 and an outlet connector 12 spaced apart. Both the inlet connector 11 and the outlet connector 12 are inserted into the water circuit board. This wastewater flow limiting device can be used with filter cartridges of different sizes, has a wide range of applications, and is easy to replace.

[0042] Specifically, the inlet connector 11 has an inlet 111 for connecting to the wastewater inlet of the water circuit board, and the outlet connector 12 has an outlet 121 for connecting to the wastewater outlet of the water circuit board. In this embodiment, in order to improve the sealing performance of the wastewater flow limiting device after it is inserted into the water circuit board, sealing rings can be provided at the insertion points of the inlet connector 11 and the outlet connector 12 with the water circuit board to achieve a seal.

[0043] It is understood that the connection method between the wastewater flow limiting device and the water circuit board is not limited to the plug-in type. In some other embodiments, the wastewater flow limiting device and the water circuit board can also be connected by threaded locking or other forms of sealed connection. This application does not limit this.

[0044] Continue reading Figure 3 As shown, the cover 2 is installed at the end of the housing 1, and together with the housing 1, defines a purification channel 5 for wastewater to come into contact with the scale inhibitor 9. The purification channel 5 connects the inlet 111 and the outlet 121. During the water purification process of the drinking water equipment, the purification channel 5 is filled with a sufficient amount of scale inhibitor 9. When the wastewater flows through the purification channel 5, it can fully react with the scale inhibitor 9, thereby inhibiting the formation of scale.

[0045] In this embodiment, the purification channel 5 is constructed in a tortuous shape. The scale inhibitor 9 is a granular or blocky chemical agent that can effectively react with calcium, magnesium and other scale-forming ions in wastewater to inhibit scale formation. Specifically, it can be phosphosilicate, SP3, etc. The scale inhibitor 9 can form soluble complexes with calcium and magnesium ions in the water, thereby effectively preventing calcium and magnesium ions from forming scale in the wastewater solenoid valve and wastewater pipe, thus ensuring that the wastewater pipe will not be blocked, and making the water purifier have a longer service life.

[0046] In this application, by filling the purification channel 5 with scale inhibitor 9, when the wastewater flows through, the scale inhibitor 9 can react with calcium, magnesium and other scale-forming ions in the wastewater to prevent scale formation, fundamentally solving the problem of easy scaling of the flow restriction orifice 6, effectively improving the long-term stable operation capability of the device in complex water quality environments, and avoiding flow control failure and frequent maintenance problems caused by scaling.

[0047] Furthermore, because the purification channel 5 is tortuous, it increases the contact area and contact time between the water flow and the scale inhibitor 9, making the scale inhibition reaction more complete and improving the scale inhibition efficiency. On the other hand, the tortuous channel design disperses the impact force of the water flow on the inner wall of the device, reducing the scouring and wear of the water flow on the flow limiting hole 6 and the overall structure of the device. Compared with the traditional straight cylindrical channel, it greatly extends the service life of the device, reduces the replacement cost caused by equipment damage, and meets the requirements of energy conservation, emission reduction and sustainable use.

[0048] Combination Figure 3 , Figure 4 and Figure 5 As shown, Figure 4 This illustration shows a cross-sectional view of the wastewater flow limiting device from another angle in one embodiment of this application. Figure 5 A schematic diagram of the water flow inside the wastewater flow limiting device according to an embodiment of this application is shown. The wastewater flow limiting device includes a partition 3 disposed within the housing 1. The partition 3 is specifically a plate-shaped blocking member. The partition 3 is located within the purification channel 5 and fixed to the inner wall of the housing 1, so that the purification channel 5 extends in a "C" shape, thereby extending the flow path of wastewater within the wastewater flow limiting device, allowing for a more complete reaction between the wastewater and the descaling agent, and improving the descaling efficiency.

[0049] In some other embodiments, the wastewater flow limiting device includes a plurality of partitions 3 disposed within the housing 1, the partitions 3 also being constructed as plate-shaped blocking members. Two adjacent partitions 3 are respectively fixed to the two opposing inner walls of the housing 1 and the cover 2, so that the purification flow channel 5 extends in a serpentine manner, thereby further extending the flow distance of wastewater within the wastewater flow limiting device, thereby further increasing the contact time between wastewater and descaling agent.

[0050] In some embodiments, the separator 3 is integrally formed on the inner wall of the housing 1, and the outer wall of the separator 3, the cover 2, and the inner wall of the housing 1 define a tortuous purification channel 5. In other embodiments, the separator 3 and the housing 1 can also adopt a separate structure, and the separator 3 is fixed to the inner wall of the housing 1 by bonding or welding, which can also cooperate with the cover 2 and the housing 1 to define a tortuous purification channel.

[0051] Continue reading Figure 5 As shown, in some embodiments, the wastewater flow limiting device also includes a check valve 4 installed in the housing 1. Specifically, the check valve 4 is installed between the inlet 111 and the scale inhibitor 9, and is sealed to the housing 1. It is used to control the wastewater to always flow in from the inlet 111 of the inlet connector 11 and out from the outlet 121 of the outlet connector 12, maintaining a stable unidirectional flow of wastewater, thereby preventing the scale inhibitor 9 in the purification channel 5 from flowing back into the water system and causing pollution to the purified water.

[0052] See Figure 3 and Figure 5 As shown, in some embodiments, the housing 1 further includes a flow-limiting hole 6, which is connected between the outlet 121 and the purification channel 5. The flow-limiting hole 6 has a flow cross-sectional area smaller than that of the purification channel 5, and the inner diameter of the flow-limiting hole 6 is smaller than that of the scale inhibitor 9, so as to limit the flow of wastewater from the wastewater flow-limiting device.

[0053] See Figure 4 As shown, in some embodiments, the wastewater flow limiting device further includes a barrier 13 fixed to the inner wall of the housing 1. The barrier 13 has a plurality of flow gaps 14 through which water flows, and all the flow gaps 14 are spaced apart on the surface of the barrier 13, serving to connect the aforementioned flow limiting orifice 6 to the purification flow channel 5. In this embodiment, the gap width of the flow gap 14 is set to be smaller than the diameter of the scale inhibitor 9, so as to achieve the blocking function of the scale inhibitor 9 particles and prevent the scale inhibitor 9 from clogging the flow limiting orifice 6.

[0054] Specifically, the barrier 13 can be constructed in a C-shape or other structures. When the scale inhibitor 9 blocks the opening on the top surface of the barrier 13, the side opening of the barrier 13 can still allow water to flow smoothly, thereby effectively solving the problem that water cannot pass through after the scale inhibitor 9 blocks the flow restriction hole 6.

[0055] In other embodiments, the wastewater flow limiting device further includes at least two baffles 13 fixed to the inner wall of the housing 1. All baffles 13 are arranged at intervals along the periphery of the flow limiting hole 6, preferably evenly distributed along the circumference of the flow limiting hole 6. A flow gap 14 is formed between two adjacent baffles 13 to allow water to flow through. Water purified by the scale inhibitor 9 can smoothly enter the flow limiting hole 6 through this gap and exit the device from the outlet 121. Specifically, the gap size of the flow gap 14 is set to be smaller than the diameter of the scale inhibitor 9 to ensure that the scale inhibitor 9 does not enter the area enclosed by the baffles 13 during the water purification process, avoiding blockage of the flow limiting hole 6 by the scale inhibitor 9 particles, thereby improving the operational reliability of the wastewater flow limiting device.

[0056] In other embodiments, the barrier 13 may be constructed as an integral part of the inner wall of the housing 1 to simplify the manufacturing process.

[0057] Combination Figures 1 to 3 As shown in the embodiment of this application, the wastewater flow limiting device is inserted into the water circuit board. Wastewater enters the purification channel 5 through the inlet 111. After passing through the check valve 4, it can come into contact with the scale inhibitor 9 and begin to dissolve. At this time, it begins to inhibit the scale formation of wastewater. As the water volume increases, it will overflow the intermediate partition 3 and overflow from the top. During this process, it continues to contact the scale inhibitor 9 and inhibit the scale formation of wastewater. Finally, it passes through the flow limiting hole 6 in the housing 1 and is discharged through the outlet 121.

[0058] In this embodiment, the wastewater flow limiting device, through the scale inhibition design within the purification channel 5, ensures that the flow limiting orifice 6 will not be blocked by scale, maintaining a stable orifice diameter. This guarantees precise control of the wastewater flow rate, enabling the entire water system to operate stably according to preset flow parameters. It avoids damage to other water system components caused by flow fluctuations, improves the overall operational stability and reliability of the water system, and effectively solves the problem of flow control accuracy being affected by scale in the prior art.

[0059] 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.

[0060] The embodiments described above are merely illustrative of 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 wastewater flow limiting device for the wastewater circuit of a filter element, characterized in that, The wastewater flow limiting device includes at least: The housing (1) includes an inlet (111), an outlet (121) and a flow restrictor (6), wherein the inlet (111) and the outlet (121) are arranged at intervals; A cover (2) is connected to the housing (1) and defines a purification channel (5) between the cover (2) and the housing (1) for wastewater to contact with the scale inhibitor (9), the purification channel (5) connecting the inlet (111) and the outlet (121); a flow restrictor (6) connecting the outlet (121) and the purification channel (5), and the flow cross-sectional area of ​​the flow restrictor (6) being smaller than the flow cross-sectional area of ​​the purification channel (5); and, Scale inhibitor (9) is filled into the purification channel (5).

2. The wastewater flow limiting device according to claim 1, characterized in that, The wastewater flow limiting device also includes a barrier (13), which has a number of spaced flow gaps (14). The flow gaps (14) can connect the flow limiting hole (6) and the purification channel (5), and the gap width of the flow gaps (14) is smaller than the diameter of the scale inhibitor (9).

3. The wastewater flow limiting device according to claim 1, characterized in that, The wastewater flow limiting device also includes at least two barrier elements (13). The barrier elements (13) are fixed to the inner wall of the housing (1) and are arranged at intervals along the periphery of the flow limiting hole (6). A flow gap (14) is formed between adjacent barrier elements (13) for water to flow through. The gap width of the flow gap (14) is smaller than the diameter of the scale inhibitor (9).

4. The wastewater flow limiting device according to claim 1, characterized in that, The wastewater flow limiting device includes a partition (3) disposed inside the housing (1), the partition (3) being fixed to the inner wall of the housing (1) so that the purification flow channel (5) extends in a "C" shape.

5. The wastewater flow limiting device according to claim 1, characterized in that, The wastewater flow limiting device includes multiple partitions (3) disposed within the housing (1). Two adjacent partitions (3) are respectively fixed to the two opposing inner walls of the housing (1) and the cover (2), so that the purification flow channel (5) extends in a serpentine shape.

6. The wastewater flow limiting device according to any one of claims 1-5, characterized in that, The wastewater flow limiting device also includes a check valve (4) installed on the housing (1). The check valve (4) is located between the inlet (111) and the scale inhibitor (9) and is used to control the unidirectional flow of wastewater from the inlet (111) to the outlet (121).

7. The wastewater flow limiting device according to any one of claims 1-5, characterized in that, The wastewater flow limiting device also includes a plurality of connectors disposed between the housing (1) and the cover (2), all of which are distributed circumferentially along the housing (1) and are used to fix the cover (2) to the housing (1).

8. The wastewater flow limiting device according to claim 7, characterized in that, The connector includes a locking part (71), a first connecting part (72), and a second connecting part (73). The first connecting part (72) is fixed to the cover (2), and the second connecting part (73) is fixed to the housing (1). Along the assembly direction of the cover (2) and the housing (1), the locking part (71) passes through and connects the first connecting part (72) and the second connecting part (73).

9. The wastewater flow limiting device according to any one of claims 1-5, characterized in that, The wastewater flow limiting device also includes a sealing element (8), which is installed between the housing (1) and the cover (2) so that the cover (2) is sealed to the housing (1).

10. A water purification device, characterized in that, The water purification equipment includes at least: The water circuit board has a wastewater inlet and a wastewater outlet spaced apart; and, The wastewater flow limiting device as described in any one of claims 1-9 is installed on the water circuit board and connected between the wastewater inlet and the wastewater outlet of the water circuit board.

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