Water purification system

Abstract

The application discloses a water purification system, comprising: a filter membrane; a concentrated water regulating valve having a water inlet for communicating with a concentrated water side of the filter membrane, a water outlet for discharging concentrated water for re-participating in water production, and a discharge port for discharging concentrated water as waste water; a backflow regulating valve device comprising a first regulating valve, a second regulating valve and a water mixing component; wherein: the first regulating valve has a tap water flow channel enabling tap water to pass into the water mixing component and a first valve core mechanism for controlling a flow passage section of the tap water flow channel; the second regulating valve has a concentrated water flow channel enabling concentrated water discharged from the water outlet of the concentrated water regulating valve to pass into the water mixing component and a second valve core mechanism for controlling a flow passage section of the concentrated water flow channel; and the water mixing component communicates with the concentrated water side of the filter membrane.

Description

Technical Field

[0001] This invention relates to the field of water purification technology, and more particularly to a water purification system. Background Technology

[0002] In a water purification system, the concentrate on the concentrate side of the filter membrane is divided into two paths by a reversing valve (or concentrate regulating valve, concentrate distribution ratio valve). One path is discharged as wastewater, and the other path is mixed with tap water and then fed back into the filter membrane to participate in the preparation of drinking water.

[0003] In existing technologies, tap water and concentrated water are typically mixed using the following two methods.

[0004] The first method involves using a T-junction to connect the water supply pipe and the return water pipe. The tap water from the water supply pipe and the concentrated water from the return water pipe enter the T-junction and then flow out from the outlet port of the T-junction to supply the filter membrane.

[0005] The second type: both the tap water pipe and the return water pipe are connected to the water tank. The tap water from the tap water pipe and the concentrated water from the return water pipe first enter the water tank and then are supplied to the filter membrane.

[0006] The two hybrid methods mentioned above in the prior art have the following drawbacks:

[0007] 1. Because the tee has a significant throttling effect, a large throttling pressure exists in the pipeline between the tee and the reversing valve. This throttling pressure severely affects the reversing valve's control of the concentrate flow rate. For example, with the flow cross-section of the reversing valve remaining constant, the throttling pressure results in a lower flow rate and velocity of the concentrate flowing out of the reversing valve for reuse in water purification, which in turn leads to a lower flow rate and velocity of water on the concentrate side of the filter membrane. Furthermore, the tap water entering the tee does not have enough time to mix with the concentrate before being supplied to the filter membrane, resulting in uneven mixing.

[0008] 2. The tap water and concentrated water entering the water tank have poor flowability, resulting in poor mixing effect between the two.

[0009] To overcome the above-mentioned defects, Chinese Patent No. 202110656875.7 provides a water purification system. This system can effectively reduce throttling pressure by adding a mixing device, thereby improving the control accuracy of the reversing valve on the flow rate and volume of concentrated water to a certain extent, and improving the mixing effect of concentrated water and tap water.

[0010] However, when the concentrated water recirculated through the reversing valve mixes with tap water, the ion concentration of the mixed water increases, causing the mixed water to be purified to remain within the high ion concentration threshold for an extended period. Consequently, the orifices of the reversing valve are prone to scaling and shrinking, especially the smallest orifice of the concentrated water discharge port, which is easily blocked by scaling during low discharge. Summary of the Invention

[0011] In view of the above-mentioned technical problems existing in the prior art, the embodiments of the present invention provide a water purification system.

[0012] To solve the above-mentioned technical problems, the technical solution adopted in the embodiments of the present invention is as follows:

[0013] A water purification system, comprising:

[0014] A filter membrane element having a filter membrane and a concentrate side and a purified water side divided by the filter membrane;

[0015] A concentrate regulating valve has an inlet for communicating with the concentrate side of a filter membrane element, an outlet for discharging concentrate that has been reused in water production, and a discharge outlet for discharging concentrate as wastewater; the inlet and the outlet are connected to the same cavity; the inlet is tangent to the cavity.

[0016] A backflow regulating valve device, comprising a first regulating valve, a second regulating valve, and a mixing component; wherein:

[0017] The first regulating valve has a tap water flow channel that allows tap water to enter the mixing component and a first valve core mechanism that controls the flow cross section of the tap water flow channel.

[0018] The second regulating valve has a concentrated water flow channel that allows concentrated water discharged from the outlet of the concentrated water regulating valve to enter the mixing component, and a second valve core mechanism that controls the flow cross section of the concentrated water flow channel.

[0019] The mixing component is connected to the concentrate side of the filter membrane element;

[0020] A booster pump is disposed between the mixing component and the filter membrane component.

[0021] Preferably, the first regulating valve further comprises:

[0022] A first valve body has a first valve cavity and a valve seat located in the first valve cavity. The valve seat has a valve hole. The first valve body has a tap water inlet and a tap water outlet communicating with the first valve cavity. The tap water inlet, the first valve cavity and the tap water outlet constitute the tap water flow channel.

[0023] The first valve core mechanism includes:

[0024] The first valve core, by axial movement, limits the opening of the valve orifice to control the flow cross section of the tap water channel;

[0025] A first spring is used to push the first valve core in the direction that closes the valve orifice.

[0026] Preferably, the wall of the valve orifice is formed into a conical surface, and the first valve core, by being located in the axial position within the valve orifice, engages with the conical surface to limit the opening of the valve orifice.

[0027] Preferably, the valve seat divides the first valve chamber into a first sub-valve chamber and a second sub-valve chamber; the tap water inlet is formed at the end of the first valve body near the first sub-valve chamber, and the tap water outlet is correspondingly connected to the second sub-valve chamber; wherein:

[0028] The first sub-valve cavity is provided with a buffer valve core and a second spring for pushing the buffer valve core toward the tap water inlet.

[0029] Preferably, the second regulating valve further comprises:

[0030] The second valve body has a second valve chamber formed therein, and the second valve body has a concentrated water inlet and a concentrated water outlet;

[0031] The second valve core mechanism includes:

[0032] A fixed plate is disposed in the second valve chamber to divide the second valve chamber into a first sub-chamber and a second sub-chamber; the concentrate inlet is connected to the first sub-chamber, and the concentrate outlet is connected to the second sub-chamber;

[0033] A rotating disk is disposed in the second sub-chamber and attached to the fixed disk; wherein:

[0034] The fixed disk has multiple guide holes arranged circumferentially, and the cross-sectional size of the multiple guide holes changes sequentially.

[0035] A hollow section is formed on the rotating disk. By rotating the rotating disk, the hollow section is aligned with the guide holes of different cross sections, so that the first sub-chamber and the second sub-chamber are connected through the guide holes corresponding to the hollow section.

[0036] The concentrate inlet, the second valve chamber, and the concentrate outlet constitute the concentrate flow channel. The flow cross-section of the concentrate flow channel is defined by connecting the first sub-chamber and the second sub-chamber through different guide holes.

[0037] Preferably, the second valve core mechanism further includes a servo motor and a rotating rod; wherein:

[0038] The servo motor is mounted on the body of the second valve body, and the rotating rod is connected to the transmission shaft of the servo motor and extends into the second valve chamber to drive the rotating disk.

[0039] Preferably, the mixing component has a cylindrical cavity inside; the mixing component has a tap water inlet channel, a concentrate inlet channel, and a mixed water outlet, the tap water outlet of the first valve body is connected to the tap water inlet channel, and the concentrate outlet of the second valve body is connected to the concentrate inlet channel; wherein:

[0040] Both the tap water inlet channel and the concentrated water inlet channel extend tangentially to the columnar cavity and communicate with the columnar cavity.

[0041] The mixed water outlet is formed at the end of the columnar cavity for connection to the concentrate side of the filter membrane.

[0042] Preferably, the cylindrical cavity is provided with a first partition plate and a second partition plate; the first partition plate divides the cylindrical cavity into a first cylindrical sub-chamber and a second cylindrical sub-chamber; the first partition plate has an opening in the middle, the second partition plate is close to the mixed water outlet, and the second partition plate has an opening in the side.

[0043] Preferably,

[0044] A degradation filter element is provided between the concentrate regulating valve and the second regulating valve;

[0045] The water supply of the first regulating valve is moved upward and equipped with a pre-filter.

[0046] Preferably, a water quality testing device is provided downstream of the water purification side of the filter membrane.

[0047] Compared with the prior art, the beneficial effects of the water purification system disclosed in this invention are:

[0048] 1. The second regulating valve limits the flow cross-section of the concentrate flow channel so that the concentrate flowing out of the outlet of the concentrate regulating valve is not directly introduced into the mixing component. In this way, the flow rates of the concentrate used to participate in water production and the concentrate used for wastewater discharge are controlled by the second regulating valve and the concentrate regulating valve respectively. This not only helps to improve the accuracy of the concentration distribution ratio, but also enables the filter membrane element to establish the pressure required for water production on the concentrate side.

[0049] 2. During water production, the concentrate in the cavity of the concentrate regulating valve maintains a high flow rate. In particular, the circumferential rotational flow prevents crystallization and precipitation in the pores of the concentrate discharge, thus making it less prone to scaling due to low discharge. This ensures the long-term stability of the regulation and control of the second regulating valve and the concentrate regulating valve.

[0050] It should be understood that the foregoing general description and the following detailed description are exemplary and illustrative only, and are not intended to limit the invention.

[0051] The overview of various implementations or examples of the technology described in this invention is not a complete disclosure of the full scope or all features of the disclosed technology. Attached Figure Description

[0052] In drawings that are not necessarily drawn to scale, the same reference numerals may describe similar parts in different views. The same reference numerals with or without letter suffixes may indicate different instances of similar parts. The drawings generally illustrate various embodiments by way of example rather than limitation and, together with the description and claims, serve to explain embodiments of the invention. Where appropriate, the same reference numerals are used in all drawings to refer to the same or similar parts. Such embodiments are illustrative and not intended to be exhaustive or exclusive embodiments of the apparatus or method.

[0053] Figure 1 This is a schematic diagram of the structure of a water purification system provided in an embodiment of the present invention.

[0054] Figure 2 A front view of a backflow regulating valve device in a water purification system provided for an embodiment of the present invention.

[0055] Figure 3 A front view of the first regulating valve in a water purification system provided for an embodiment of the present invention.

[0056] Figure 4 A front view of the second regulating valve in a water purification system provided for an embodiment of the present invention.

[0057] Figure 5 for Figure 4 The D-direction view.

[0058] Figure 6 for Figure 2 The C-direction view.

[0059] Figure label:

[0060] 10-First regulating valve; 11-First valve body; 111-Water inlet; 112-Water outlet; 121-First sub-valve chamber; 122-Second sub-valve chamber; 13-First valve core mechanism; 131-First valve core; 132-Valve hole; 1321-Conical surface; 133-Valve seat; 134-Piston; 135-Piston seat; 1351-Piston chamber; 136-First spring; 137-Buffer valve core; 138-Second spring; 14-Water distribution grid; 20-Second regulating valve; 21-Second valve body; 211-Concentrate inlet; 212-Concentrate outlet; 221-First sub-chamber; 222-Second sub-chamber; 23-Second valve core mechanism; 231-Fixed disc; 2 311-Flow guide hole; 232-Rotating disk; 2321-Hollowed part; 233-Rotating rod; 234-Servo motor; 30-Mixing component; 31-Columnar cavity; 311-First sub-columnar cavity; 312-Second sub-columnar cavity; 321-Tap water inlet channel; 322-Concentrate inlet channel; 323-Mixed water outlet; 33-First partition plate; 331-Opening; 34-Second partition plate; 341-Opening; 100-Recirculation regulating valve device; 200-Concentrate regulating valve; 300-Filter membrane element; 400-Boost pump; 500-Pre-filter cartridge; 600-Solenoid valve; 700-Degradation filter cartridge; 800-Water quality testing device; 901-Sterilization device; 902-Water storage tank. Detailed Implementation

[0061] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the described embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0062] Unless otherwise defined, the technical or scientific terms used in this invention shall have the ordinary meaning understood by one of ordinary skill in the art to which this invention pertains. The terms "first," "second," and similar terms used in this invention do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0063] To keep the following description of the embodiments of the present invention clear and concise, detailed descriptions of known functions and known components are omitted.

[0064] like Figure 1 As shown, an embodiment of the present invention discloses a water purification system, which includes a filter membrane element 300, a concentrate regulating valve 200, a reflux regulating valve device 100, and a booster pump 400. The outlet end of the concentrate side of the filter membrane element 300 is connected to the inlet of the concentrate regulating valve 200, which allows the concentrate produced after filtration to enter the concentrate regulating valve 200. During the process of the concentrate passing through the concentrate regulating valve 200, part of the concentrate is discharged as wastewater through the discharge port, and the other part of the concentrate is discharged from the outlet of the concentrate regulating valve 200 to participate in water purification again. Tap water flowing from the tap water pipe and the concentrate flowing from the concentrate regulating valve 200 are mixed by the reflux regulating valve device 100, and then fed back into the inlet end of the concentrate side of the filter membrane element 300 by the booster pump 400 to participate in the preparation of purified water.

[0065] The concentrate regulating valve 200 can be the concentrate regulating valve provided by Chinese Patent No. 202011317964.0. This concentrate regulating valve controls the distribution ratio of concentrate by controlling the flow rate of wastewater discharge, and there is no restriction between the inlet and outlet of the concentrate regulating valve. Of course, any regulating valve with no restriction between the inlet and outlet can be used as this concentrate regulating valve 200. This application does not limit the specific structure of the concentrate regulating valve 200, and the driving method of the concentrate regulating valve provided by Chinese Patent No. 202011317964.0 can be configured as motor drive.

[0066] like Figures 2 to 6 As shown, the backflow regulating valve device 100 includes a first regulating valve 10, a second regulating valve 20, and a mixing component 30. The first regulating valve 10 limits the flow rate of tap water, the second regulating valve 20 limits the flow rate of concentrated water flowing out of the outlet of the concentrated water regulating valve 200, and the mixing component 30 mixes the tap water passing through the first regulating valve 10 with the concentrated water passing through the second regulating valve 20. The mixed water is pressurized by the booster pump 400 and enters the inlet end of the concentrated water side of the filter membrane element 300. That is, the first regulating valve 10 internally forms a tap water flow channel, and the first regulating valve 10 controls the flow rate of tap water by limiting the flow cross-section of the tap water flow channel; the second regulating valve 20 internally forms a concentrated water flow channel, and the second regulating valve 20 controls the flow rate of concentrated water by limiting the flow cross-section of the concentrated water flow channel.

[0067] In this invention, the second regulating valve 20 limits the flow cross-section of the concentrate flow channel so that the concentrate flowing out of the outlet of the concentrate regulating valve 200 is not directly introduced into the mixing component 30. Thus, the flow rates of the concentrate used for re-participation in water production and the concentrate used for wastewater discharge are both controlled by the second regulating valve 20 and the concentrate regulating valve 200 respectively. This not only helps to improve the accuracy of adjusting the concentration distribution ratio, but also enables the filter membrane element 300 to establish the pressure required for water production on the concentrate side.

[0068] When adjusting the concentrate ratio, the following control principles can be adopted:

[0069] The first regulating valve 10 increases (or decreases) the flow cross-section of the concentrate flow channel, while the concentrate regulating valve 200 regulates the flow cross-section of the wastewater flow channel (the flow channel internally defined by the concentrate regulating valve 200) to decrease (or increase), and can also keep the sum of the flow cross-sections of the concentrate flow channel and the wastewater flow channel constant.

[0070] The reflux regulating valve device 100 can have various structural types. For example, the first regulating valve 10 and the second regulating valve 20 in the reflux regulating valve device 100 share a valve body, and the two sets of valve core mechanisms are used to control the tap water and concentrated water respectively. For example, the mixing valve device provided by Chinese Patent No. 202110758883.2 controls the mixing ratio of tap water flow and concentrated water flow through a valve body and two sets of valve cores respectively.

[0071] A preferred embodiment of the present invention provides a backflow regulating valve device 100 that differs from the structure of the above-described mixing valve device. The first regulating valve 10 and the second regulating valve 20 of the backflow regulating valve device 100 have independent valve bodies.

[0072] like Figure 3 and combined Figure 1 , 2 As shown, the first regulating device includes: a first valve body 11 and a first valve core 131 mechanism 13; the first valve body 11 is generally cylindrical, and a first valve cavity is formed inside the first valve body 11. A valve seat 133 is formed in the first valve cavity, and the valve seat 133 divides the first valve cavity into a first sub-valve cavity 121 and a second sub-valve cavity 122. The first sub-valve cavity 121 is closer to the end of the first valve body 11. A valve hole 132 is provided on the first valve seat 133. The valve hole 132 is used to connect the first sub-valve cavity 121 and the second sub-valve cavity 122. The hole wall of the valve hole 132 forms a conical surface 1321; a piston seat 135 is installed in the second sub-valve cavity 122, and a piston cavity 1351 is provided on the piston seat 135.

[0073] The tap water inlet 111 is formed at the end of the first valve body 11 near the first sub-valve chamber 121. Tap water from upstream enters the first sub-valve chamber 121 through the tap water inlet 111 and enters the second sub-valve chamber 122 through the valve hole 132. The tap water outlet 112 is formed at the position corresponding to the second sub-valve chamber 122. The tap water outlet 112 is in communication with the second sub-valve chamber 122 so that the tap water entering the second sub-valve chamber 122 flows into the mixing component 30 through the tap water outlet 112 to mix with the concentrated water.

[0074] The first valve core 131 mechanism 13 includes a first valve core 131, a piston 134, a piston 134 rod, a buffer valve core 137, a first spring 136, and a second spring 138. The first valve core 131 extends into the valve hole 132. The piston 134 is located in the piston chamber 1351 of the piston seat 135. The piston 134 rod connects the first valve core 131 and the piston 134, which makes the first valve core 131 and the piston 134 move synchronously. The first spring 136 is used to push the valve core against the piston 134 towards the valve hole 132, which makes the first valve core 131 have a closing tendency towards the valve hole 132. A plurality of water distribution grids 14 are provided in the first sub-valve chamber 121. The water distribution grids 14 are arranged circumferentially to form a hole. The buffer valve core 137 is located in the hole facing the tap water inlet 111. The second spring 138 is used to push the buffer valve core 137 towards the tap water inlet 111. Thus, the tap water entering the first valve body 11 from the tap water inlet 111 forces the buffer valve core 137 to open. The buffer valve core 137 and the water distribution grid 14 buffer the pressure fluctuation of the tap water to a certain extent. The tap water entering the first sub-valve chamber 121 causes the first valve core 131 to move axially toward the first spring 136, thereby causing the first valve core 131 and the conical surface 1321 of the valve hole 132 to jointly limit the opening of the valve hole 132. This is the position that affects the flow section of the tap water channel. Under the action of the first spring 136, the first valve core 131 and the valve hole 132 limit the flow section of the tap water channel, thereby controlling the flow rate of the tap water. The tap water entering the second sub-valve chamber 122 and having its flow rate limited flows into the mixing component 30 through the tap water outlet 112.

[0075] like Figure 4 , 5 and combined Figure 1 , 2 As shown, the second regulating valve 20 includes: a second valve body 21 and a second valve core mechanism 23; a second valve cavity is formed inside the second valve body 21.

[0076] The second valve core mechanism 23 includes: a fixed disk 231, a rotating disk 232, a servo motor 234, and a rotating rod 233. The fixed disk 231 is disposed in the second valve cavity and divides the second valve cavity into a first sub-chamber 221 and a second sub-chamber 222; the concentrate inlet 211 of the second valve body 21 is located at the end near the first sub-chamber 221, and the concentrate outlet 212 of the second valve body 21 corresponds to and communicates with the second sub-chamber 222; the rotating disk 232 is located in the second sub-chamber 222 and is attached to the fixed disk 231.

[0077] Multiple guide holes 2311 are opened on the fixed disk 231 (or multiple guide holes 2311 are opened on the rotating disk 232). The cross-sectional size of the multiple guide holes 2311 changes sequentially. A hollow part 2321 is formed on the rotating disk 232 (or a hollow part 2321 is formed on the fixed disk 231). By rotating the rotating disk 232, the hollow part 2321 is made to face the guide holes 2311 with different cross-sections (this is the position of the flow cross section that affects the concentrate flow channel), so that the first sub-chamber 221 and the second sub-chamber 222 are connected through the guide holes 2311 corresponding to the hollow part 2321. The concentrate inlet 211 is connected to the outlet of the concentrate regulating valve 200, and the concentrate outlet 212 is connected to the mixing component 30. Thus, the concentrated water flowing out from the concentrated water regulating valve 200 enters the first sub-chamber 221 through the concentrated water inlet 211, and enters the second sub-chamber 222 through the guide hole 2311 corresponding to the hollow part 2321. By connecting the first sub-chamber 221 and the second sub-chamber 222 with different guide holes 2311, the flow cross section of the concentrated water channel is limited, thereby limiting the flow rate of the concentrated water. The concentrated water entering the second sub-chamber 222 enters the mixing component 30 through the concentrated water outlet 212 to mix with the tap water that also enters the mixing component 30.

[0078] like Figure 6 and combined Figure 1 , 2As shown, the mixing component 30 includes a main body, within which a columnar cavity 31 is formed. A first partition plate 33 and a second partition plate 34 are disposed within the columnar cavity 31. The first partition plate 33 divides the columnar cavity 31 into a first sub-columnar cavity 311 and a second sub-columnar cavity 312. The second partition plate 34 is disposed at the distal end of the main body within the second sub-columnar cavity 312. The mixing component 30 has a tap water inlet channel 321, a concentrate inlet channel 322, and a mixed water outlet 323. The tap water outlet 112 of the first valve body 11 is connected (possibly by plug-in connection) to the tap water inlet channel 321, and the concentrate outlet 212 of the second valve body 21 is connected (possibly by plug-in connection) to the concentrate inlet channel 322. Both the tap water inlet channel 321 and the concentrate inlet channel 322 extend tangentially to the first sub-column cavity 311 and communicate with the first sub-column cavity 311; the mixed water outlet 323 is formed at the distal end of the second sub-column cavity 312 for communication with the concentrate side inlet of the filter membrane element 300 via the booster pump 400. Thus, the tap water and concentrated water flowing out from the tap water outlet 112 and the concentrated water outlet 212 respectively enter the first sub-column cavity 311 tangentially through the tap water inlet channel 321 and the concentrated water inlet channel 322 to achieve circumferential rotation. This not only facilitates the mixing of tap water and concentrated water but also reduces flow resistance. The mixed water of tap water and concentrated water after circumferential rotation enters the second sub-column cavity 312 through the opening 331 in the middle of the first partition plate 33. The mixed water in the second sub-column cavity 312 then flows out through the opening 341 in the side of the second partition plate 34 and finally flows out from the mixed water outlet 323. The outflowing mixed water is pressurized by the booster pump 400 and enters the inlet end of the concentrated water side of the filter membrane element 300.

[0079] like Figure 1 As shown, in some preferred embodiments, a pre-filter 500 and a solenoid valve 600 are installed on the pipeline between the tap water source A and the tap water inlet 111 of the first regulating valve 10. The pre-filter 500 is used to pre-filter the tap water to remove sediment, rust, colloids, discoloration, odor, etc. The solenoid valve 600 is used to control the flow of tap water, thereby controlling whether tap water is supplied to the first regulating valve 10.

[0080] like Figure 1 As shown, in some preferred embodiments, a degradation filter element 700 is provided on the pipeline between the outlet of the concentrate regulating valve 200 and the concentrate inlet 211 of the second regulating valve 20 to reduce the ion concentration of the concentrate that is re-entered into water production to a certain extent.

[0081] like Figure 1As shown, in some preferred embodiments, two pipes are led out from the water outlet on the purified water side of the filter membrane 300. The first pipe is equipped with a sterilization device 901 and a water quality detection device 800, and ultimately supplies the purified water in this pipe to the purified water user end. The second pipe leads to the water storage tank 902. Wastewater distributed via the concentrate regulating valve is discharged from the wastewater discharge end C.

[0082] Furthermore, although exemplary embodiments have been described in this invention, their scope includes any and all embodiments based on the invention that have equivalent elements, modifications, omissions, combinations (e.g., schemes involving intersections of various embodiments), adaptations, or alterations. Elements in the claims will be interpreted broadly based on the language used in the claims and are not limited to the examples described in this specification or during the implementation of this application, and such examples will be interpreted as non-exclusive. Therefore, this specification and examples are intended to be considered illustrative only, and the true scope and spirit are indicated by the full scope of the following claims and their equivalents.

[0083] The above description is intended to be illustrative and not restrictive. For example, the above examples (or one or more of them) can be used in combination with each other. Other embodiments can be used by those skilled in the art when reading the above description. Furthermore, in the above detailed description, various features may be grouped together to simplify the invention. This should not be construed as an intention that a disclosed feature, which is not claimed, is necessary for any claim. Rather, the subject matter of the invention may be less than all the features of the particular disclosed embodiments. Thus, the following claims are incorporated herein by reference as examples or embodiments, wherein each claim is independently considered as a separate embodiment, and these embodiments are contemplated as being able to be combined with each other in various combinations or arrangements. The scope of the invention should be determined by reference to the appended claims and the full scope of their equivalents.

[0084] The above embodiments are merely exemplary embodiments of the present invention and are not intended to limit the present invention. The scope of protection of the present invention is defined by the claims. Those skilled in the art can make various modifications or equivalent substitutions to the present invention within its spirit and scope of protection, and such modifications or equivalent substitutions should also be considered to fall within the scope of protection of the present invention.

Claims

1. A water purification system, characterized in that, include: A filter membrane element having a filter membrane and a concentrate side and a purified water side divided by the filter membrane; A concentrate regulating valve has an inlet for communicating with the concentrate side of a filter membrane element, an outlet for discharging concentrate that has been reused in water production, and a discharge outlet for discharging concentrate as wastewater; the inlet and the outlet are connected to the same cavity; at least the inlet is tangent to the cavity; A backflow regulating valve device, comprising a first regulating valve, a second regulating valve, and a mixing component; wherein: The first regulating valve has a tap water flow channel that allows tap water to enter the mixing component and a first valve core mechanism that controls the flow cross section of the tap water flow channel. The second regulating valve has a concentrated water flow channel that allows concentrated water discharged from the outlet of the concentrated water regulating valve to enter the mixing component, and a second valve core mechanism that controls the flow cross section of the concentrated water flow channel. The mixing component is connected to the concentrate side of the filter membrane element; A booster pump is disposed between the mixing component and the filter membrane element; The second regulating valve also has: The second valve body has a second valve chamber formed therein, and the second valve body has a concentrated water inlet and a concentrated water outlet; The second valve core mechanism includes: A fixed plate is disposed in the second valve chamber to divide the second valve chamber into a first sub-chamber and a second sub-chamber; the concentrate inlet is connected to the first sub-chamber, and the concentrate outlet is connected to the second sub-chamber; A rotating disk is disposed in the second sub-chamber and attached to the fixed disk; wherein: The fixed disk has multiple guide holes arranged circumferentially, and the cross-sectional size of the multiple guide holes changes sequentially. A hollow section is formed on the rotating disk. By rotating the rotating disk, the hollow section is aligned with the guide holes of different cross sections, so that the first sub-chamber and the second sub-chamber are connected through the guide holes corresponding to the hollow section. The concentrate inlet, the second valve chamber, and the concentrate outlet constitute the concentrate flow channel. The flow cross-section of the concentrate flow channel is defined by connecting the first sub-chamber and the second sub-chamber through different guide holes.

2. The water purification system according to claim 1, characterized in that, The first regulating valve also has: A first valve body has a first valve cavity and a valve seat located in the first valve cavity. The valve seat has a valve hole. The first valve body has a tap water inlet and a tap water outlet communicating with the first valve cavity. The tap water inlet, the first valve cavity and the tap water outlet constitute the tap water flow channel. The first valve core mechanism includes: The first valve core, by axial movement, limits the opening of the valve orifice to control the flow cross section of the tap water channel; A first spring is used to push the first valve core in the direction that closes the valve orifice.

3. The water purification system according to claim 2, characterized in that, The valve orifice wall forms a conical surface, and the first valve core, by being located in the axial position within the valve orifice, engages with the conical surface to limit the opening of the valve orifice.

4. The water purification system according to claim 2, characterized in that, The valve seat divides the first valve chamber into a first sub-valve chamber and a second sub-valve chamber; the tap water inlet is formed at the end of the first valve body near the first sub-valve chamber, and the tap water outlet is correspondingly connected to the second sub-valve chamber; wherein: The first sub-valve cavity is provided with a buffer valve core and a second spring for pushing the buffer valve core toward the tap water inlet.

5. The water purification system according to claim 1, characterized in that, The second valve core mechanism also includes a servo motor and a rotating rod; wherein: The servo motor is mounted on the body of the second valve body, and the rotating rod is connected to the transmission shaft of the servo motor and extends into the second valve chamber to drive the rotating disk.

6. The water purification system according to claim 1, characterized in that, The mixing component has a cylindrical cavity inside; the mixing component has a tap water inlet channel, a concentrate inlet channel, and a mixed water outlet, the tap water outlet of the first valve body is connected to the tap water inlet channel, and the concentrate outlet of the second valve body is connected to the concentrate inlet channel; wherein: Both the tap water inlet channel and the concentrated water inlet channel extend tangentially to the columnar cavity and communicate with the columnar cavity. The mixed water outlet is formed at the end of the columnar cavity for communication with the concentrate side of the filter membrane element.

7. The water purification system according to claim 6, characterized in that, The cylindrical cavity is provided with a first partition plate and a second partition plate; the first partition plate divides the cylindrical cavity into a first cylindrical sub-chamber and a second cylindrical sub-chamber; the first partition plate has an opening in the middle, the second partition plate is close to the mixed water outlet, and the second partition plate has an opening on its side.

8. The water purification system according to claim 1, characterized in that, A degradation filter element is provided between the concentrate regulating valve and the second regulating valve; A pre-filter is installed upstream of the water supply of the first regulating valve.

9. The water purification system according to claim 1, characterized in that, A water quality testing device is installed downstream of the purified water side of the filter membrane.

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