Water purification system

Abstract

The present invention discloses a water purification system, comprising: a water purification device having a permeable membrane and a concentrated water chamber and a purified water chamber located on both sides of the permeable membrane; a mixing water tank having a first water inlet, a second water inlet and a water return port, the first water inlet being used to guide initial water into the mixing water tank, and the water return port being communicated with the concentrated water chamber of the water purification device; a pumping device disposed between the water return port and the concentrated water chamber; a valve mechanism; wherein: the valve mechanism is communicated with the concentrated water chamber to guide the concentrated water in the concentrated water chamber to flow out, and the guided concentrated water is divided into a first branch concentrated water for being fed into the mixing water tank through the second water inlet and a second branch concentrated water for discharging with a variable flow distribution ratio; the pumping device is used to re-feed the raw water formed by mixing the first branch concentrated water and the initial water in the mixing water tank into the concentrated water chamber.

Description

Technical Field

[0001] The present invention relates to the technical field of water purification, and particularly to a water purification system. Background Art

[0002] Chinese Patent with application number 2020102712896 discloses a device and method for adjusting the quality of purified water and a water purification system, and the patent discloses the following technical solutions:

[0003] A concentrated water tank and a raw water tank are arranged side by side outside a purification device with a permeable membrane (the purification device described in this patent is called a purification system). A long and narrow channel extending vertically and penetrating the partition between the concentrated water tank and the raw water tank is opened. The concentrated water in the concentrated water chamber on one side of the permeable membrane in the purification device is continuously transported to the concentrated water tank. Part of the concentrated water entering the concentrated water tank enters the raw water tank through the long and narrow channel and is mixed with the initial water (such as tap water) transported to the raw water tank by the initial liquid input pipe to form raw water. The raw water formed by the participation of this concentrated water is transported back to the concentrated water chamber of the permeable membrane. Through such a cycle, the problem of concentration polarization of concentrated water is solved, that is, the problem of concentration polarization of concentrated water in the concentrated water chamber is solved by recycling at least part of the concentrated water in the permeable membrane.

[0004] To avoid too low or too high ion concentration of the raw water in the raw water tank and to maintain the ion concentration of the raw water in the raw water tank within a required concentration range, the patent also discloses the following technical solutions:

[0005] A concentrated water discharge pipe is arranged at the bottom of the raw water tank, a liquid level sensor for detecting the liquid level position is arranged at the long and narrow channel, and an ion concentration sensor (called a raw water measurer in this patent) for detecting the ion concentration of the raw water is arranged in the raw water tank.

[0006] The method in this patent to avoid too low or too high ion concentration of the raw water is as follows:

[0007] When the ion concentration sensor detects that the ion concentration of the raw water is lower than the required concentration range, the concentrated water discharge pipe is controlled to close, the liquid level of the concentrated water in the concentrated water tank rises, so that the flow rate of the concentrated water entering the raw water tank increases, and the proportion of the concentrated water in the raw water tank increases, thereby being able to increase the ion concentration of the raw water; when the ion concentration sensor detects that the ion concentration of the raw water is higher than the required concentration range, the concentrated water discharge pipe is controlled to open, the liquid level of the concentrated water in the concentrated water tank drops, so that the flow rate of the concentrated water entering the raw water tank decreases, and the proportion of the initial water in the raw water tank increases, thereby being able to reduce the ion concentration of the raw water.

[0008] The method in this patent to maintain the ion concentration of the raw water within the required concentration range is as follows:

[0009] Since the liquid level of the concentrated water in the concentrated water tank is usually between the highest point and the lowest point of the narrow channel, and the flow rate of the concentrated water passing through the narrow channel and entering the raw water tank increases as the liquid level height of the concentrated water in the concentrated water tank rises and decreases as the liquid level height of the concentrated water decreases, therefore, within the required concentration range, a relationship is established between the ion concentration detected by the ion concentration sensor and the liquid level height of the concentrated water in the concentrated water tank detected by the liquid level sensor, so as to obtain a liquid level height range corresponding to the required concentration range based on the established relationship, and then the actual liquid level height of the concentrated water is controlled within this height range to keep the concentration of the raw water within the required concentration range.

[0010] However, during the implementation of this patent, the applicant found the following defects in this patent:

[0011] 1. The sensitivity of adjusting the ion concentration of the raw water is poor. Specifically, in the above patent, the cross-sectional area of the concentrated water passing through the narrow channel is increased by raising the liquid level of the concentrated water in the concentrated water tank. However, due to the small cross-sectional area of the narrow channel, the narrow channel has a large throttling effect on the concentrated water, which in turn causes the concentrated water not to be replenished into the raw water tank through the narrow channel in a timely and sufficient amount, and then the concentration of the raw water in the raw water tank rises slowly.

[0012] The applicant once tried to reduce the throttling effect of the narrow channel by increasing the width of the narrow channel. However, after increasing the width of the narrow channel, it led to the problem that the flow rate of the concentrated water flowing through the narrow channel was not easy to control.

[0013] 2. The relationship between the flow rate of the concentrated water flowing through the narrow channel and the liquid level height in the concentrated water tank is unstable, which in turn leads to the instability (or uncertainty) of the relationship between the ion concentration of the raw water in the raw water tank and the liquid level height in the concentrated water tank. The reason is that: the concentrated water flows through the narrow channel by the pressure formed by only its own gravity as the driving force, and the pressure value formed by gravity is very small. Therefore, the changes in the density of the concentrated water (the ion concentration of the concentrated water will affect the density of the concentrated water), viscosity, impurities in the concentrated water, and the surface quality of the inner wall of the narrow channel will all affect the flow rate of the concentrated water. Therefore, the concentrated water with the same liquid level height at different times cannot guarantee the same flow rate. Therefore, by controlling the liquid level height of the concentrated water, the ion concentration of the raw water in the raw water tank cannot be accurately maintained within the required concentration range.

[0014] 3. Only the concentrated water in the area close to the liquid level in the concentrated water tank enters the raw water tank through the narrow channel, and the fluidity of the concentrated water in other areas is poor, resulting in easy breeding of bacteria. Summary of the Invention

[0015] In view of the above technical problems existing in the prior art, an embodiment of the present invention provides a water purification system.

[0016] To solve the above technical problems, the technical solution adopted in the embodiments of the present invention is as follows:

[0017] A water purification system, comprising:

[0018] A water purification device, which has a permeable membrane and a concentrated water chamber and a purified water chamber located on both sides of the permeable membrane;

[0019] A mixing water tank, which has a first water inlet, a second water inlet and a water return port. The first water inlet is used to guide initial water into the mixing water tank, and the water return port is communicated with the concentrated water chamber of the water purification device;

[0020] A pumping device, which is arranged between the water return port and the concentrated water chamber;

[0021] A valve mechanism; wherein:

[0022] The valve mechanism is communicated with the concentrated water chamber to guide the concentrated water in the concentrated water chamber to flow out, and the guided concentrated water is divided into a first branch concentrated water for being fed into the mixing water tank through the second water inlet and a second branch concentrated water for discharging with a variable flow distribution ratio; the pumping device is used to re-feed the raw water formed by mixing the first branch concentrated water and the initial water in the mixing water tank into the concentrated water chamber.

[0023] Preferably, the valve mechanism is further configured to:

[0024] The valve mechanism can adjust the sum flow rate of the first branch concentrated water and the second branch concentrated water.

[0025] Preferably, the valve mechanism is further configured to:

[0026] Make the adjustment process of the sum flow rate of the concentrated water by the valve mechanism independent of the adjustment process of the distribution ratio of the concentrated water.

[0027] Preferably, the water purification system further includes an ion concentration sensor;

[0028] The ion concentration sensor is at least used to detect the ion concentration of the purified water, so as to control the valve mechanism based on the detection result of the ion concentration sensor and adjust the flow rate of the first branch concentrated water.

[0029] Preferably, the ion concentration sensor is further used to simultaneously detect the ion concentration of the raw water and the ion concentration of the purified water in the purified water chamber, so as to establish a corresponding relationship between the ion concentration of the purified water in the purified water chamber and the ion concentration of the raw water.

[0030] Preferably, when the ion concentration of the purified water in the purified water chamber detected by the ion concentration sensor is within the required purified water concentration range, a correspondence relationship is established between the ion concentration of the purified water in the purified water chamber and the ion concentration of the raw water, so as to obtain the raw water concentration range corresponding to the required purified water concentration range; wherein:

[0031] By controlling the raw water concentration range, the ion concentration of the purified water is limited within the required purified water ion concentration range.

[0032] Preferably, the ion concentration sensor for detecting the ion concentration of the raw water is arranged in the mixing water tank.

[0033] Preferably, the ion concentration sensor for detecting the ion concentration of the purified water is arranged in the purified water chamber or on the output pipeline for leading out the purified water.

[0034] Preferably, the valve mechanism at least includes two flow valves respectively used for controlling the flow rate of the concentrated water in the first branch and the flow rate of the concentrated water in the second branch.

[0035] Preferably, the valve mechanism includes a reversing valve, and based on the reversing valve, the sum flow rate of the concentrated water in the first branch and the concentrated water in the second branch and the flow rate distribution ratio of the concentrated water in the first branch and the concentrated water in the second branch are controlled.

[0036] Preferably, the reversing valve includes:

[0037] A valve body, in which a valve cavity is formed, and the valve body has an inlet, a first outlet and a second outlet;

[0038] A first valve member, at least part of which is arranged in the valve cavity;

[0039] A second valve member, at least part of which is arranged in the valve cavity; wherein:

[0040] The first valve member and the second valve member cooperate to define a first flow channel for connecting the first outlet of the valve body with the inlet of the valve body and a second flow channel for connecting the second outlet of the valve body with the inlet of the valve body;

[0041] The first valve member can rotate and has a rotation stroke, and the first valve member rotates within the rotation stroke to change the size of the sum of the flow cross-sections of the first flow channel and the second flow channel;

[0042] The second valve member can move and has a movement stroke, and the second valve member moves within the movement stroke to change the size of the respective flow cross-sections of the first flow channel and the second flow channel;

[0043] The water inlet of the valve body communicates with the concentrated water chamber so that after the concentrated water enters the valve body, it is defined and distributed by the flow cross-sections of the first flow channel and the second flow channel, and the first branch concentrated water and the second branch concentrated water of the fluid respectively flow out from the first water outlet and the second water outlet of the valve body.

[0044] Preferably, the mixing water tank includes:

[0045] A first cavity, the first branch concentrated water enters the first cavity through the second water inlet of the mixing water tank, and the initial water enters the first cavity through the first water inlet of the mixing water tank;

[0046] A mixing water flow channel, its first end communicates with the first cavity, and the second end of the mixing water channel forms the water return port of the mixing water tank or the water return port of the mixing water tank communicates with the second end of the mixing water channel; wherein:

[0047] The mixing water flow channel is used to make the water passing through it change the water flow direction at least twice to mix the initial water and the concentrated water into raw water.

[0048] Preferably, a plurality of partition plates are arranged along the extending direction of the mixing water flow channel, and a flow-through gap for water to pass through is correspondingly formed at each partition plate, and the plurality of flow-through gaps are arranged up and down and / or left and right in the four directions of the cross-section of the mixing water flow channel.

[0049] Preferably, the mixing water tank further includes a second cavity, the second cavity communicates with the second end of the mixing water channel to receive the raw water flowing out from the second end of the mixing water channel; the water return port is formed in the second cavity.

[0050] Preferably, an ion concentration sensor for checking the ion concentration of the raw water is arranged at the port of the second end of the mixing water channel and / or arranged in the second cavity.

[0051] Preferably, the first water inlet and the second water inlet of the mixing water tank are arranged one below the other; wherein:

[0052] The second water inlet of the mixing water tank is located above the first water inlet of the mixing water tank.

[0053] Preferably, a one-way valve is arranged at the second water inlet of the mixing water tank, and the one-way valve includes:

[0054] A valve core, which is pivotally connected to the side wall of the first cavity, and the valve core blocks the second water inlet of the mixing water tank or opens the second water inlet of the mixing water tank by pivoting;

[0055] A float, which is connected to the valve core, is used to float on the liquid surface in the first cavity to control the valve core to block the second water inlet of the mixing water tank or open the second water inlet of the mixing water tank based on the liquid level height.

[0056] Compared with the prior art, the beneficial effects of the water purification system disclosed by the present invention are as follows:

[0057] 1. Continuously draw the concentrated water from the concentrated water cavity, and re-transport the raw water formed by mixing the drawn concentrated water with the initial water to the concentrated water cavity of the osmotic membrane. Through such a cycle, the problem of concentration polarization of the concentrated water is solved, that is, the problem of concentration polarization of the concentrated water in the concentrated water cavity is solved by recycling at least part of the concentrated water in the osmotic membrane.

[0058] 2. By adding a valve mechanism that can change the distribution ratio of the first branch concentrated water and the second branch concentrated water, the flow rate of the concentrated water entering the mixing water tank can be accurately adjusted. Moreover, by using the pressure provided by the pumping device, the flow rate can be adjusted more accurately. Furthermore, the mixing ratio of the initial water and the concentrated water can be accurately adjusted, and then the ion concentration of the raw water can be accurately adjusted. Finally, the ion concentration of the purified water can be accurately adjusted.

[0059] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not intended to limit the present invention.

[0060] The overview of various implementations or examples of the technology described in the present invention is not a complete disclosure of the entire scope or all features of the disclosed technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0061] In the drawings, which are not necessarily drawn to scale, the same reference numerals may describe similar components in different views. The same reference numerals with alphabetical suffixes or different alphabetical suffixes may represent different instances of similar components. The drawings generally illustrate various embodiments by way of example and not limitation, and are used together with the description of the specification and the claims to explain the embodiments of the invention. Where appropriate, the same reference numerals are used throughout the drawings to refer to the same or similar parts. Such embodiments are illustrative and not intended to be an exhaustive or exclusive embodiment of the device or method.

[0062] Figure 1 The water purification system provided by an embodiment of the present invention.

[0063] Figure 2 The water purification system provided by another embodiment of the present invention.

[0064] Figure 3 The main cross-sectional view of the reversing valve in the water purification system provided by the embodiment of the present invention.

[0065] Figure 4 is Figure 3 the sectional view taken along the A-A direction of

[0066] Figure 5 is Figure 3 the sectional view taken along the C-C direction of

[0067] Figure 6 is Figure 3 the view taken along the B direction of

[0068] Figure 7 the main sectional view of a mixing water tank of a structural form provided in the water purification system according to an embodiment of the present invention.

[0069] Figure 8 is Figure 7 the sectional view taken along the D-D direction of

[0070] Figure 9 the main sectional view of a mixing water tank of another structural form provided in the water purification system according to an embodiment of the present invention.

[0071] Figure 10 is Figure 9 the sectional view taken along the F-F direction of

[0072] Reference numerals:

[0073] 100 - reversing valve; 110 - first valve component; 111 - valve sleeve; 1111 - first annular groove; 1112 - second annular groove; 1113 - third annular groove; 1114 - third valve sleeve hole; 112 - first driven part; 120 - second valve component; 121 - valve rod; 1211 - diversion cavity; 122 - second driven part; 130 - valve body; 131 - first water outlet; 132 - second water outlet; 133 - water inlet; 141 - first flow channel; 1411 - first valve rod hole; 1412 - first valve sleeve hole; 142 - second flow channel; 1421 - second valve rod hole; 1422 - second valve sleeve hole; 151 - first driving mechanism; 1513 - motor; 152 - second driving mechanism; 1521 - first bevel gear; 1522 - second bevel gear; 1523 - motor; 1524 - rotating part; 200 - mixing water tank; 210 - first cavity; 220 - mixed water flow channel; 221 - partition; 222 - flow-through gap; 2231 - water inlet port; 2232 - water outlet port; 2233 - exhaust hole; 231 - second water inlet; 232 - first water inlet; 240 - second cavity; 241 - water return port; 250 - check valve; 251 - valve core; 252 - float; 260 - second ion concentration sensor; 300 - purification device; 301 - concentrated water cavity; 302 - purified water cavity; 303 - permeable membrane; 400 - pumping device; 500 - waste water tank; 600 - valve mechanism; 601 - flow valve; 602 - tee joint. Detailed implementation manners

[0074] 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 of the embodiments of the present invention. Apparently, the described embodiments are some but not all of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the described embodiments of the present invention without creative efforts shall fall within the scope of protection of the present invention.

[0075] Unless otherwise defined, the technical terms or scientific terms used in the present invention shall have the ordinary meanings understood by those of ordinary skill in the art to which the present invention pertains. The "first", "second" and similar terms used in the present invention do not denote any order, quantity or importance, but are only used to distinguish different components. The terms such as "comprising" or "including" mean that the elements or items appearing before this term cover the elements or items listed after this term and their equivalents, without excluding other elements or items. The terms such as "connected" or "coupled" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. The terms such as "upper", "lower", "left" and "right" are only used to represent relative positional relationships, and when the absolute position of the object being described changes, the relative positional relationships may also change accordingly.

[0076] 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 in the present invention.

[0077] An embodiment of the present invention discloses a water purification system, which is used to make initial water such as tap water form purified water that can be directly drunk by people. Specifically, as Figure 1 and Figure 2 shown, the purification system includes: a water purification device, a mixing water tank 200, a pumping device 400, and a valve mechanism 600.

[0078] A permeable membrane 303 is arranged in the water purification device. A concentrated water chamber 301 and a purified water chamber 302 are respectively formed on both sides of the permeable membrane 303. The function of the permeable membrane 303 is that when the water in the concentrated water chamber 301 passes through the permeable membrane 303, some ions are intercepted, so that the ion concentration of the water flowing into the purified water chamber 302 through the permeable membrane 303 is reduced.

[0079] It should be noted that

[0080] 1. Although the water that enters the purified water chamber 302 through the permeable membrane 303 is called purified water, this purified water is not absolutely pure water without ions. There are still ions with a certain concentration in this purified water, and the water with a certain concentration of ions is beneficial to the human body.

[0081] 2. The water that enters the concentrated water chamber 301 and is mixed with the separated solute to obtain water with a higher ion concentration is usually called concentrated water. Calling this water concentrated water does not mean that the ion concentration of this water is extremely high, but only means that the ion concentration of this water is higher than that of the purified water.

[0082] The mixing water tank 200 has a first water inlet 232, a second water inlet 231, and a water return port 241. The water return port 241 ( Figure 1 and Figure 2 not marked in the figure) is communicated with the concentrated water chamber 301. The initial water such as tap water enters the mixing water tank 200 through the first water inlet 232; the pumping device 400 is arranged on the pipeline (pipe, channel) between the water return port 241 and the concentrated water chamber 301. The pumping device 400 is used to flow the water (raw water described below) in the mixing water tank 200 out from the water return port 241 and pump this water into the concentrated water chamber 301 with a certain pressure. Therefore, the pumping device 400 makes the concentrated water in the concentrated water chamber 301 have a certain pressure, and this pressure is a necessary condition for the permeable membrane 303 to carry out the filtering work.

[0083] In the present invention, the valve mechanism 600 is communicated with the concentrated water chamber 301 to guide the concentrated water in the concentrated water chamber 301 to flow out, and the guided concentrated water is divided into a first branch concentrated water for being supplied into the mixing water tank 200 through the second water inlet 231 and a second branch concentrated water for being discharged into the waste water tank 500 with a variable flow distribution ratio. The first branch concentrated water that enters the mixing water tank 200 through the second water inlet 231 is mixed with the initial water that enters the mixing water tank 200 through the first water inlet 232 in the mixing water tank 200. The mixed water may be called raw water. This raw water flows out from the water return port 241 through the above-mentioned pumping device 400 and is pumped into the concentrated water chamber 301 (it is easy to understand that after the raw water is pumped into the concentrated water chamber 301, due to the permeable membrane 303 intercepting part of the ions, the raw water forms concentrated water with a higher ion concentration).

[0084] Based on the above, the advantages of the above-mentioned water purification system provided by the present invention are as follows:

[0085] 1. Continuously draw the concentrated water out of the concentrated water chamber 301, and re-transport the raw water formed by mixing the drawn concentrated water with the initial water to the concentrated water chamber 301 of the permeable membrane 303. Through such a cycle, the problem of concentration polarization of the concentrated water is solved, that is, the problem of concentration polarization of the concentrated water in the concentrated water chamber 301 is solved by at least partially recycling the concentrated water in the permeable membrane 303.

[0086] 2. By adding a valve mechanism 600 that can change the distribution ratio of the first branch concentrated water and the second branch concentrated water, the flow rate of the concentrated water entering the mixing water tank 200 can be accurately adjusted. Moreover, by utilizing the pressure provided by the pumping device 400, the flow rate can be adjusted more accurately, thereby enabling the accurate adjustment of the mixing ratio of the initial water and the concentrated water, further enabling the accurate adjustment of the ion concentration of the raw water, and ultimately enabling the accurate adjustment of the ion concentration of the purified water.

[0087] In some preferred embodiments, the valve mechanism 600 is configured to have the following functions:

[0088] Enable the valve mechanism 600 to also adjust the total flow rate of the first branch concentrated water and the second branch concentrated water, that is, enable the valve mechanism 600 to also adjust the total output of the concentrated water flowing out of the concentrated water chamber 301.

[0089] The advantage of configuring the valve mechanism 600 to be able to adjust the total output of the concentrated water is as follows:

[0090] 1. The valve mechanism 600 can adapt to permeable membranes 303 with different filtration efficiencies. If the permeable membrane 303 has a better filtration function, for example, when the permeable membrane 303 allows a larger flow rate of water to pass through per unit time, the total output of the concentrated water can be reduced through the valve mechanism 600, thereby reducing the discharge amount of the second branch concentrated water and the recycling amount of the first branch concentrated water. This is beneficial for water conservation and can reduce the energy consumption of the entire system. If the permeable membrane 303 has a poor filtration function or has a high requirement for avoiding concentration polarization, the total output of the concentrated water can be increased through the valve mechanism 600. In this way, the flow rate of the concentrated water flowing through the concentrated water chamber 301 can be increased, accelerating the circulation speed of the concentrated water in the concentrated water chamber 301, which will surely reduce the working pressure of the permeable membrane 303 and can avoid the polarization phenomenon to a greater extent.

[0091] 2. The valve mechanism 600 can adapt to pumping devices 400 with different operating efficiencies.

[0092] If the operating power of the pumping device 400 is large, that is, the flow rate of water pumped into the concentrated water chamber 301 per unit time is large, the total output of the concentrated water can be increased through the valve mechanism 600 to avoid an increase in the water pressure in the concentrated water chamber 301 (excessive water pressure will affect the service life and filtration effect of the permeable membrane 303); if the operating function of the pumping device 400 is small, the total output of the concentrated water can be reduced through the valve mechanism 600 to avoid a decrease in the water pressure in the concentrated water chamber 301 (insufficient water pressure will affect the filtration efficiency of the permeable membrane 303).

[0093] In some preferred embodiments, the valve mechanism 600 is further configured to have the following functions:

[0094] The adjustment process of the valve mechanism 600 for the concentrated water and flow rate is independent of the adjustment process for the distribution ratio of the concentrated water. That is to say, when the valve mechanism 600 adjusts the flow rate distribution ratio of the first branch concentrated water and the second branch concentrated water, the total output of the concentrated water will not change; when the valve mechanism 600 adjusts the total output of the concentrated water, the flow rate distribution ratio of the first branch concentrated water and the second branch concentrated water will not change.

[0095] The advantage of making the adjustment process of the valve mechanism 600 for the concentrated water and flow rate independent of the adjustment process for the distribution ratio of the concentrated water is as follows:

[0096] 1. When adjusting the first branch concentrated water and the second branch concentrated water for some reasons (for example, when it is necessary to change the ion concentration of the raw water or the ion concentration of the purified water), the total output of the concentrated water will not change, so the pressure of the water in the concentrated water chamber 301 will not change. Therefore, it will not cause an impact on components such as the osmotic membrane 303 due to the change in pressure of the water in the concentrated water chamber 301.

[0097] 2. Since the pressure fluctuation in the concentrated water chamber 301 is avoided, the service life of the osmotic membrane 303 can be improved, and it is ensured that the ion concentration of the purified water flowing out from the osmotic membrane 303 will not fluctuate.

[0098] In some preferred embodiments, the purification system further includes a first ion concentration sensor, which is used to detect the ion concentration in the purified water, and based on the detection result of the first ion concentration sensor, the valve mechanism 600 is used to adjust the flow rate of the first branch concentrated water. Specifically, when the actual concentration value of the ion concentration in the purified water detected by the first ion concentration sensor is within the required ion concentration range of the purified water, the valve mechanism 600 keeps the first branch concentrated water at the current flow rate; when the actual concentration value of the ion concentration in the purified water detected by the first ion concentration sensor is higher than the required ion concentration range of the purified water, the flow rate of the first branch concentrated water is reduced through the valve mechanism 600. For example, it can be achieved by keeping the total output of the concentrated water unchanged and adjusting the flow rate distribution ratio of the first branch concentrated water and the second branch concentrated water; when the actual concentration value of the ion concentration in the purified water detected by the first ion concentration sensor is lower than the required ion concentration range of the purified water, the flow rate of the first branch concentrated water is increased through the valve mechanism 600. For example, it can be achieved by keeping the total output of the concentrated water unchanged and adjusting the flow rate distribution ratio of the first branch concentrated water and the second branch concentrated water. Preferably, the ion concentration sensor for detecting the ion concentration in the purified water is arranged in the purified water chamber 302 or on the output pipeline for leading out the purified water

[0099] In some more preferred embodiments, in addition to the first ion concentration sensor for checking the ion concentration of the purified water, the water purification system is further provided with a second ion concentration sensor 260 for detecting the ion concentration of the raw water, so as to establish a corresponding relationship between the ion concentration of the purified water in the water purification chamber 302 and the ion concentration of the raw water. Specifically, on the premise that the filtration effect of the permeable membrane 303 remains unchanged and the pressure in the concentrated water chamber 301 remains unchanged, the ion concentration of the purified water and the ion concentration of the raw water have a relatively constant functional relationship. For example, when the ion concentration of the purified water is A0, the raw water has a uniquely corresponding ion concentration A1. Thus, the first ion concentration sensor and the second ion concentration sensor 260 can be used to establish a corresponding relationship between the ion concentration of the purified water and the ion concentration of the raw water. Thus, the purpose of controlling the ion concentration of the purified water can be achieved by adjusting the ion concentration of the raw water, and the ion concentration of the raw water can be adjusted by the function of the valve mechanism 600 to adjust the flow distribution ratio. Preferably, the second ion concentration sensor 260 for detecting the ion concentration of the raw water is arranged in the mixing water tank 200.

[0100] The advantages of the water purification system additionally provided with the second ion concentration sensor 260 are as follows:

[0101] 1. It can establish a corresponding relationship between the ion concentration of the purified water in the water purification chamber 302 and the ion concentration of the raw water.

[0102] 2. Based on the established corresponding relationship, the purpose of controlling the ion concentration of the purified water can be achieved by controlling the ion concentration of the raw water, and the valve mechanism 600 can more directly and accurately control the ion concentration of the raw water, overcoming the defect that the change in the concentrated water flow lags behind the change in the ion concentration to the greatest extent.

[0103] The valve mechanism 600 can have various structural forms. For example, as Figure 1 shown, the valve mechanism 600 can be composed of two flow valves 601 and a tee joint 602; the water inlet 133 of the tee joint 602 is communicated with the concentrated water chamber 301, and the two water outlets of the tee joint 602 are respectively communicated with the two flow valves 601. The first branch of concentrated water and the second branch of concentrated water respectively pass through the two flow valves 601, and the flow valves 601 are used to control the flow rate of the branch concentrated water. For example, the flow distribution ratio of the first branch of concentrated water and the second branch of concentrated water can be adjusted by simultaneously increasing the through-flow cross-section of the opening of one flow valve 601 and simultaneously decreasing the through-flow cross-section of the other flow valve 601; for another example, the total output of the concentrated water can be adjusted by simultaneously increasing or decreasing the through-flow cross-sections of the two flow valves 601 synchronously.

[0104] However, it can be understood that when two flow valves 601 are used to adjust the flow distribution ratio and the total output of the concentrated water, it is difficult to achieve synchronous adjustment. Moreover, installing the two flow valves 601 and the three-way joint 602 in the water purification system is not conducive to intensive design.

[0105] In a preferred embodiment of the present invention, as Figure 2 and in combination with Figures 3 to 6 shown, a reversing valve 100 with a special structure is provided as the valve mechanism 600. The reversing valve 100 includes: a valve body 130, a first valve member 110, a second valve member 120, and a first driving mechanism 151 and a second driving mechanism 152.

[0106] As Figure 3 shown, the valve body 130 has a water inlet 133, a first water outlet 131, and a second water outlet 132; the water inlet 133, the first water outlet 131, and the second water outlet 132 are all located at different axial positions of the valve body 130 and are all radially penetrated into the interior of the valve body 130; the water inlet 133 is used to communicate with the concentrated water chamber 301, so that the concentrated water in the concentrated water chamber 301 enters the valve body 130 through the water inlet 133, and the first water outlet 131 is used to communicate with the second water inlet 231 of the mixing water tank 200, and the second water outlet 132 is used to communicate with the waste water tank 500.

[0107] The first valve member 110 includes a valve sleeve 111 and a first driven part 112; the valve sleeve 111 extends into the valve cavity of the valve body 130, and the first driven part 112 extends out of the first end of the valve body 130; an inner hole (blind hole) is axially opened inward from the end of the valve sleeve 111; first annular grooves 1111, second annular grooves 1112, and third annular grooves 1113 are respectively opened at axial positions of the outer periphery of the valve sleeve 111 opposite to the first water outlet 131, the second water outlet 132, and the water inlet 133; and first valve sleeve holes 1412, second valve sleeve holes 1422, and third valve sleeve holes 1114 that can penetrate the valve sleeve 111 are respectively opened at the bottoms of the first annular groove 1111, the second annular groove 1112, and the third annular groove 1113. And: as Figure 4 and Figure 5 shown, both the first valve sleeve holes 1412 and the second valve sleeve holes 1422 include a plurality of them and the number is the same; the first valve sleeve holes 1412 and the second valve sleeve holes 1422 are both circumferentially arranged, and the first valve sleeve holes 1412 and the second valve sleeve holes 1422 gradually become smaller or gradually become larger synchronously in cross-section in the same circumferential arrangement direction.

[0108] The first driving mechanism 151 is disposed at the first end of the valve body 130. The first driven part 112 of the first valve member 110 is connected to the first driving mechanism 151, and the first driving mechanism 151 is used to drive the valve sleeve 111 to rotate. Preferably, the first driving mechanism 151 is a motor 1513, for example, a servo motor or a stepper motor.

[0109] The second valve member 120 includes a valve stem 121 and a second driven part 122; the valve stem 121 extends into the inner hole of the valve sleeve 111 from the second end of the valve body 130, and a diversion cavity 1211 starts axially inward from the end of the valve stem 121. This enables the concentrated water entering the valve body 130 through the water inlet 133 to enter the inner hole of the valve sleeve 111 through the third annular groove 1113 and the third valve sleeve hole 1114, and then enter the diversion cavity 1211 through the inner hole of the valve sleeve 111; a first valve stem hole 1411 and a second valve stem hole 1421 are formed on the outer periphery of the valve stem 121; both the first valve stem hole 1411 and the second valve stem hole 1421 penetrate through to the diversion cavity 1211. The first valve sleeve hole 1412 is used to correspond to the first valve stem hole 1411, and the second valve sleeve hole 1422 is used to correspond to the second valve stem hole 1421. Moreover, when the valve sleeve 111 rotates such that the first valve sleeve hole 1412 and the second valve sleeve hole 1422 respectively circumferentially correspond to the first valve stem hole 1411 and the second valve sleeve hole 1422, the concentrated water entering the diversion cavity 1211 will be divided into two parts. The first part is the first branch concentrated water described above, and this first branch concentrated water will sequentially pass through the first valve stem hole 1411, the first valve sleeve hole 1412, and the first annular groove 1111, and then flow out from the first water outlet 131 and enter the mixing water tank 200; while the second part is the second branch concentrated water described above, and this second branch concentrated water will sequentially pass through the second valve stem hole 1421, the second valve sleeve hole 1422, and the second annular groove 1112, and then flow out from the second water outlet 132 and enter the waste water tank 500. Thus, it can be known that the first valve stem hole 1411 and the first valve sleeve hole 1412, as well as the second valve stem hole 1421 and the second valve sleeve hole 1422, respectively define a first flow path 141 for making a part of the concentrated water form the first branch concentrated water and allowing the first branch concentrated water to flow out from the first water outlet 131, and a second flow path 142 for making the other part of the concentrated water form the second branch concentrated water and allowing the second branch concentrated water to flow out from the second water outlet 132.

[0110] In the reversing valve 100, when the valve sleeve 111 rotates such that the first valve sleeve hole 1412 and the second valve sleeve hole 1422 are circumferentially corresponding to the first valve rod hole 1411 and the second valve rod hole 1422 respectively, the first valve sleeve hole 1412 and the first valve rod hole 1411 can form an overlap, and the second valve sleeve hole 1422 and the second valve rod hole 1421 can form an overlap synchronously. Thus, if the valve rod 121 is axially moved, the overlapping areas of the first valve sleeve hole 1412 and the first valve rod hole 1411 and the second valve sleeve hole 1422 and the second valve rod hole 1421 can be changed simultaneously. Since the minimum cross-sections of the first flow channel 141 and the second flow channel 142 are formed at the overlapping parts of the holes of the valve sleeve 111 and the valve rod 121, the overlapping area formed by the holes of the valve sleeve 111 and the valve rod 121 is the flow cross-section of the flow channel. Therefore, by moving the valve rod 121, the flow cross-sections S1 and S2 of the first flow channel 141 and the second flow channel 142 can be changed, and thus the flow rates of the first branch concentrated water and the second branch concentrated water can be changed respectively.

[0111] It should be noted that in fluid mechanics, the flow cross-section refers to the cross-section perpendicular to the fluid flow direction. For example, for the case of fluid flowing in a pipeline, the flow cross-section refers to the cross-section of the inner hole at any position of the pipeline. In the following text of the present invention, the flow cross-section specifically refers to the smallest cross-section among all the cross-sections perpendicular to the fluid flow direction. This smallest cross-section is used to limit the flow rate of the fluid (water) flowing through the flow channel. The larger the flow cross-section, the greater the flow rate of the fluid flowing through the flow channel. Therefore, by moving the valve rod 121, the flow rates of the first branch concentrated water and the second branch concentrated water can be changed respectively.

[0112] Based on the above description, as Figure 3 and combined with Figure 6As shown, when the valve stem 121 moves in the first moving direction (rightward movement), the overlapping area formed between the first valve stem hole 1411 and the corresponding first valve sleeve hole 1412 decreases, thereby causing the flow cross-section S1 of the first flow channel 141 to decrease, and further causing the flow rate of the first branch concentrated water flowing through the first flow channel 141 to decrease; at the same time, the overlapping area formed between the second valve stem hole 1421 and the corresponding second valve sleeve hole 1422 increases, thereby causing the flow cross-section S2 of the second flow channel 142 to increase, and further causing the flow rate of the second branch concentrated water flowing through the second flow channel 142 to increase. When the valve stem 121 moves in the second moving direction (leftward movement), the overlapping area formed between the first valve stem hole 1411 and the corresponding first valve sleeve hole 1412 increases, thereby causing the flow cross-section S1 of the first flow channel 141 to increase, and further causing the flow rate of the first branch concentrated water flowing through the first flow channel 141 to increase; at the same time, the overlapping area formed between the second valve stem hole 1421 and the corresponding second valve sleeve hole 1422 decreases, thereby causing the flow cross-section S2 of the second flow channel 142 to decrease, and further causing the flow rate of the second branch concentrated water flowing through the second flow channel 142 to decrease. Therefore, the flow rate distribution ratio of the water flow can be adjusted by the movement of the valve stem 121.

[0113] Furthermore, since the outer shapes and dimensions of the first valve sleeve hole 1412 corresponding to the first valve stem hole 1411 and the second valve sleeve hole 1422 corresponding to the second valve stem hole 1421 are exactly the same, and by setting the valve sleeve 111 hole into a structure in which two hole walls in the circumferential direction are parallel to each other, for example, setting the valve sleeve 111 hole into a wire groove structure extending along the axis, it is such that: when the valve stem 121 moves, the change amount of the flow cross-section of the first flow channel 141 is equal to the change amount of the flow cross-section of the second flow channel 142, thereby ensuring that the total conveyance amount of the concentrated water remains unchanged when adjusting the flow rate distribution ratio of the water flow.

[0114] Since the cross-sections of the first valve sleeve hole 1412 and the second valve sleeve hole 1422 gradually become smaller or gradually become larger synchronously in the same circumferential arrangement direction; by rotating the valve sleeve 111, it is possible to synchronously switch the correspondence between the first valve stem hole 1411 and different first valve sleeve holes 1412 and the correspondence between the second valve stem hole 1421 and different second valve sleeve holes 1422, thereby causing the flow cross-sections of the first flow channel 141 and the second flow channel 142 to increase or decrease synchronously, and further enabling the total output amount of water to be adjusted by rotating the valve sleeve 111.

[0115] Based on the above, by axially moving the valve stem 121, the flow rate distribution ratio of the concentrated water can be changed, and by rotating the valve sleeve 111, the total output amount of the concentrated water can be changed, and the adjustment of the flow rate distribution ratio and the adjustment of the total output amount are independent of each other and do not affect each other, thereby being able to meet the functional requirements of the valve mechanism 600 described above.

[0116] The second driving mechanism 152 is used to drive the valve stem 121 to axially move. Specifically, the second driven part 122 extends out of the second end of the valve body 130. The second driving mechanism 152 includes: a rotating member 1524 and a motor 1523. The rotating member 1524 is sleeved on the extending end of the second driven part 122 and forms a screw drive with the extending end of the second driven part 122. The motor 1523 is used to drive the rotating member 1524 to rotate to drive the second driven part 122 to axially move. The motor 1523 can preferably be a stepper motor or a servo motor. Preferably, a first bevel gear 1521 is formed on the rotating member 1524; a second bevel gear 1522 is formed on the output shaft of the motor 1523, and the second bevel gear 1522 meshes with the first bevel gear 1521; wherein: the number of teeth of the first bevel gear 1521 is greater than the number of teeth of the second bevel gear 1522. By making the number of teeth of the first bevel gear 1521 greater than the number of teeth of the second bevel gear 1522, the rotation speed of the rotating member 1524 can be reduced, the moving speed of the second driven part 122 and the valve stem 121 can be reduced, and the impact on the valve stem 121 caused by movement can be effectively reduced.

[0117] The advantages of using the reversing valve 100 as the valve mechanism 600 to adjust the flow distribution ratio of the concentrated water and the total output of the concentrated water are as follows:

[0118] The reversing valve 100 can form the first branch concentrated water and the second branch concentrated water inside the valve body 130, and by controlling the rotation of the first valve member 110 and the movement of the second valve member 120, the total output of water and the flow distribution ratio of the diverted water can be adjusted. Therefore, only by using this reversing valve 100 can the flow distribution ratio and the total output of the concentrated water be adjusted, thereby replacing two flow valves 601 and a tee joint 602, and to a certain extent, reducing the control difficulty of flow regulation and facilitating the intensive design of the water purification system.

[0119] As Figures 7 to 10 shown, the mixing water tank 200 at least includes a first cavity 210, a mixing water flow channel 220, and a water return port 241.

[0120] The first water inlet 232 and the second water inlet 231 of the mixing water tank 200 are communicated with the first cavity 210. The initial water enters the first cavity 210 through the first water inlet 232, and the first branch concentrated water distributed by the valve mechanism 600 enters the first cavity 210 through the second water inlet 231. The first cavity 210 has the function of temporarily storing the initial water and the first branch concentrated water.

[0121] It can be understood that the initial water and the first branch concentrated water can be preliminarily mixed by the way of free diffusion after entering the first cavity 210.

[0122] One end of the mixed water flow channel 220 is formed with a water inlet port 2231 which communicates with the first cavity 210. The other end of the mixed water flow channel 220 communicates with the water return port 241 of the mixing water tank 200. The pumping device 400 connected between the concentrated water cavity 301 of the water purification device and the water return port 241 sucks the mixing water tank 200, causing the water temporarily stored in the first cavity 210 to flow through the mixed water flow channel 220 at a certain flow rate and finally flow out from the water return port 241.

[0123] A blocking structure or component is arranged in the mixed water flow channel 220. By arranging the blocking structure or component in the mixed water flow channel 220, the water containing the initial water and the first branch concentrated water is forced to change its flow direction when passing through the mixed water flow channel 220. This will inevitably accelerate the mutual fusion of the initial water and the concentrated water with a concentration difference, and further enable the initial water and the first branch concentrated water to be fully mixed to form raw water during the process of changing the flow direction.

[0124] By arranging the mixed water flow channel 220 for water supply circulation in the mixing water tank 200 and forcing the water to change its flow direction during the process of flowing through the mixed water flow channel 220, the water can obtain a fully mixed effect.

[0125] In some preferred embodiments, the partition plate 221 is selected as the blocking component for changing the water flow direction. Specifically, a plurality of partition plates 221 are arranged in the mixed water channel. The plurality of partition plates 221 are arranged at intervals along the extending direction of the mixed water channel, and a flow-through gap 222 allowing water to pass through is correspondingly formed at each partition plate 221. The plurality of flow-through gaps 222 are arranged in the four directions of up, down, left, and right in the cross-section of the mixed water flow channel 220.

[0126] For example, four partition plates 221 are arranged in the mixed water flow channel 220. The flow-through gaps 222 corresponding to the two partition plates 221 close to the first cavity 210 are horizontal gaps, and the two flow-through gaps 222 are arranged up and down in the cross-section direction of the mixed water flow channel 220. The flow-through gaps 222 corresponding to the two partition plates 221 far from the first cavity 210 are vertical gaps, and the two filtering gaps are arranged left and right in the cross-section of the mixed water flow channel 220. In this way, the water first flows obliquely upward and passes through the first flow-through gap 222, then flows obliquely downward and passes through the second flow-through gap 222, then flows obliquely leftward and passes through the third flow-through gap 222, and then flows obliquely rightward and passes through the fourth flow-through gap 222.

[0127] Of course, the present invention does not limit the arrangement and number of the overflow gaps 222. For example, the overflow gaps 222 can also adopt the arrangement of horizontal gap (upper or lower) - vertical gap (left or right) - horizontal gap (lower or upper) - vertical gap (right or left); for another example, six partition plates 221 are arranged in the mixed water flow channel 220 to form four overflow gaps 222, or an integer multiple of four partition plates 221 are arranged to form an integer multiple of four overflow gaps 222.

[0128] The overflow gaps 222 can be formed in a variety of ways, and two formation methods are listed below:

[0129] The first one (not shown in the drawings): directly open the overflow gaps 222 on the partition plates 221. For example, open a horizontal gap as the overflow gap 222 at the upper part of the partition plate 221, open a horizontal gap as the overflow gap 222 at the lower part of the partition plate 221, open a vertical gap as the overflow gap 222 at the left side of the partition plate 221, and open a vertical gap as the overflow gap 222 at the left side of the partition plate 221.

[0130] The second one: the partition plates 221 and the inner wall of the mixed water flow channel 220 define the overflow gaps 222. For example, the upper side edge of the partition plate 221 and the top wall of the mixed water flow channel 220 define a horizontal gap as the overflow gap 222, the lower side edge of the partition plate 221 and the top wall of the mixed water flow channel 220 define a horizontal gap as the overflow gap 222, the left side edge of the partition plate 221 and the left side wall of the mixed water flow channel 220 define a vertical gap as the overflow gap 222, and the right side edge of the partition plate 221 and the right side wall of the mixed water flow channel 220 define a vertical gap as the overflow gap 222.

[0131] In the present invention, the mixing water tank 200 may only include the first cavity 210. However, the mixing water tank 200 may also include both the first cavity 210 and the second cavity 240 at the same time.

[0132] Figure 7 The structure of the mixing water tank 200 that only includes the first cavity 210 is shown. In this structure, a water outlet port 2232 is formed at one end of the mixed water flow channel 220 far from the first cavity 210. This water outlet port 2232 serves as the water return port 241 of the mixing water tank 200 and is communicated with the pumping device 400. In this way, the raw water formed through the mixed water flow channel 220 flows out of the mixing water tank 200 from this water outlet port 2232 and is pumped into the concentrated water chamber 301 of the purification device 300 by the pumping device 400.

[0133] Figure 9The structure of the mixing water tank 200 including both the first cavity 210 and the second cavity 240 is shown. And in a preferred embodiment, the second cavity 240 is arranged in parallel with the first cavity 210, and the two share a side wall. In this structure, the water outlet port 2232 at the end of the mixing water flow channel 220 far from the first cavity 210 communicates with the second cavity 240. The water return port 241 of the mixing water tank 200 is formed on the side wall of the second cavity 240, and the pumping device 400 communicates with the water return port 241. Thus, the raw water formed through the mixing water flow channel 220 flows out from the end of the mixing water flow channel 220 far from the first cavity 210 and flows into the second cavity 240. The water entering the second cavity 240 flows out from the water return port 241 on the side wall and is pumped by the pumping device 400 into the concentrated water cavity 301 of the purification device 300.

[0134] In some preferred embodiments, the mixing water flow channel 220 is arranged as a straight flow channel, and the mixing water flow channel 220 is arranged on one side of the bottom of the first cavity 210. When the mixing water tank 200 includes the second cavity 240, the mixing water flow channel 220 also passes below the second cavity 240.

[0135] In some preferred embodiments, an exhaust hole 2233 is provided between the mixing water flow channel 220 and the second cavity 240. The exhaust hole 2233 is used to discharge the bubbles generated in the mixing water channel into the second cavity 240, and the bubbles discharged into the second cavity 240 will diffuse to the outside through buoyancy. By discharging the bubbles from the mixing water flow channel 220, the interference caused by gas enrichment in the mixing water flow channel 220 to the water flow can be reduced.

[0136] In some preferred embodiments, the first water inlet 232 is located below the second purified water outlet. The density of the first branch of concentrated water is relatively large, while the density of the initial water is relatively small. Thus, the first branch of concentrated water diffuses downward, and the initial water diffuses upward, resulting in the first branch of concentrated water and the initial water coming into contact in an opposite movement manner, which is beneficial for their preliminary mixing in the first cavity 210.

[0137] The first water inlet 232 is formed on the side wall of the first cavity 210. The second water inlet 231 can be formed on the side wall of the first cavity 210, or the lower port of a water inlet pipe vertically extending into the first cavity 210 can be used as the second water inlet 231.

[0138] In some preferred embodiments, a check valve 250 is further provided at the water inlet 133. Specifically, the check valve 250 includes a valve core 251 and a float 252. The valve core 251 is pivotally connected to the side wall of the first cavity 210. The valve core 251 blocks or opens the first water inlet 232 by pivoting. The float 252 is connected to the valve core 251. The float 252 is used to float on the liquid surface in the first cavity 210 to control the valve core 251 to block or open the first water inlet 232 based on the liquid level height. Thus, when the water in the first cavity 210 rises to a certain height, the buoyancy of the water on the float 252 forces the first water inlet 232 to close, and the initial water will not flow into the first cavity 210. When the water in the first cavity 210 is lower than another height, the float 252 causes the valve core 251 to open as the liquid level height drops, so that the initial water can flow into the first cavity 210. The function of the check valve 250 is as follows: when the water flowing out of the first cavity 210 remains unchanged and the first branch concentrated water flowing in through the second water inlet 231 increases, the check valve 250 will reduce the flow rate of the initial water or prevent the initial water from flowing into the first cavity 210. When the water flowing out of the first cavity 210 remains unchanged and the concentrated water flowing in through the second water inlet 231 decreases, the check valve 250 will increase the flow rate of the initial water, thereby maintaining a rough balance of the total amount of water in the first cavity 210.

[0139] Preferably, the volume of the first cavity 210 is made smaller than the volume of the second cavity 240, which is beneficial for the initial water and the first branch concentrated water to be preliminarily mixed in the first cavity 210.

[0140] In some preferred embodiments, there are multiple second ion concentration sensors 260. For example, there are three second ion concentration sensors 260. One second ion concentration sensor 260 is arranged in the middle of the mixed water flow channel 220, another is arranged at the end of the mixed water flow channel 220, and the third is arranged in the second cavity 240. By averaging the results detected by the three second ion concentration sensors 260 as the detected value of the ion concentration value of the raw water, the defect that the detection result is too different from the actual concentration caused by the detection error of a single sensor is effectively compensated.

[0141] In addition, although exemplary embodiments have been described in the present invention, the scope includes any and all embodiments based on the present invention with equivalent elements, modifications, omissions, combinations (e.g., various embodiments intersecting schemes), adaptations or changes. The elements in the claims will be interpreted broadly based on the language adopted in the claims, and are not limited to the examples described in this specification or during the implementation of this application, and their examples will be interpreted as non-exclusive. Therefore, this specification and examples are intended to be considered as examples only, and the true scope and spirit are indicated by the following claims and the full scope of their equivalents.

[0142] The above description is intended to be illustrative rather than restrictive. For example, the above examples (or one or more of them) can be used in combination with each other. For example, a person of ordinary skill in the art can use other embodiments when reading the above description. In addition, in the above-mentioned specific embodiments, various features can be grouped together to simplify the present invention. This should not be interpreted as an intention that a disclosed feature that is not required to be protected is necessary for any claim. On the contrary, the subject matter of the present invention may be less than all the features of a specific disclosed embodiment. Thus, the following claims are incorporated into the specific embodiments as examples or embodiments, wherein each claim is independently used as a separate embodiment, and it is considered that these embodiments can be combined with each other in various combinations or arrangements. The scope of the present invention should be determined with reference to the attached claims and the full scope of equivalent forms granted by these claims.

[0143] The above embodiments are only exemplary embodiments of the present invention and are not intended to limit the present invention. The protection scope of the present invention is defined by the claims. Those skilled in the art may make various modifications or equivalent substitutions to the present invention within the essence and protection scope of the present invention, and such modifications or equivalent substitutions shall also be deemed to fall within the protection scope of the present invention.

Claims

1. A water purification system, characterized in that, Comprising: A water purification device having a permeable membrane and a concentrated water chamber and a purified water chamber on both sides of the permeable membrane; A mixing water tank having a first water inlet, a second water inlet and a water return port, the first water inlet being used to guide initial water into the mixing water tank, and the water return port being communicated with the concentrated water chamber of the water purification device; A pumping device disposed between the water return port and the concentrated water chamber; A valve mechanism; wherein: The valve mechanism is communicated with the concentrated water chamber to guide the concentrated water in the concentrated water chamber to flow out, and divides the guided concentrated water into a first branch concentrated water for being fed into the mixing water tank through the second water inlet and a second branch concentrated water for discharging with a variable flow distribution ratio; the pumping device is used to re-feed the raw water formed by mixing the first branch concentrated water and the initial water in the mixing water tank into the concentrated water chamber; The water purification system further includes an ion concentration sensor; The ion concentration sensor is at least used to detect the ion concentration of the purified water in the purified water chamber, so as to control the valve mechanism based on the detection result of the ion concentration sensor and adjust the flow rate of the first branch concentrated water; The ion concentration sensor is also used to simultaneously detect the ion concentration of the raw water and the ion concentration of the purified water in the purified water chamber, so as to establish a corresponding relationship between the ion concentration of the purified water in the purified water chamber and the ion concentration of the raw water; When the ion concentration of the purified water in the purified water chamber detected by the ion concentration sensor is within the required purified water concentration range, establish a corresponding relationship between the ion concentration of the purified water in the purified water chamber and the ion concentration of the raw water, so as to obtain the raw water concentration range corresponding to the required purified water concentration range; wherein: Limit the ion concentration of the purified water within the required purified water ion concentration range by controlling the raw water concentration range.

2. The water purification system according to claim 1, characterized in that, The valve mechanism is further configured to: The valve mechanism can adjust the sum flow rate of the first branch concentrated water and the second branch concentrated water.

3. The water purification system according to claim 2, wherein, The valve mechanism is further configured to: Make the adjustment process of the sum flow rate of the concentrated water by the valve mechanism and the adjustment process of the distribution ratio of the concentrated water independent of each other.

4. The water purification system according to claim 1, characterized in that, An ion concentration sensor for detecting the ion concentration of the raw water is disposed in the mixing water tank.

5. The water purification system according to claim 1, characterized in that, An ion concentration sensor for detecting the ion concentration of the purified water is disposed in the purified water chamber or on the output pipeline for leading out the purified water.

6. The water purification system according to claim 1, wherein The valve mechanism at least includes two flow valves respectively used to control the flow rate of the first branch concentrated water and the flow rate of the second branch concentrated water.

7. The water purification system according to claim 3, characterized in that, The valve mechanism includes a reversing valve, and based on the reversing valve, control the sum flow rate of the first branch concentrated water and the second branch concentrated water and the flow distribution ratio of the first branch concentrated water and the second branch concentrated water.

8. The water purification system according to claim 7, wherein, The reversing valve includes: A valve body, in which a valve cavity is formed, and the valve body has a water inlet, a first water outlet and a second water outlet; A first valve component, at least part of which is disposed in the valve cavity; A second valve component, at least part of which is disposed in the valve cavity; wherein: The first valve member and the second valve member cooperate to define a first flow path for communicating the first water outlet of the valve body with the water inlet of the valve body and a second flow path for communicating the second water outlet of the valve body with the water inlet of the valve body; The first valve member is rotatable and has a rotation stroke, and the first valve member rotates within the rotation stroke to change the sum of the flow cross-sectional areas of the first flow path and the second flow path; The second valve member is movable and has a movement stroke, and the second valve member moves within the movement stroke to change the respective flow cross-sectional areas of the first flow path and the second flow path; The water inlet of the valve body is communicated with the concentrated water chamber so that the concentrated water enters the valve body and is defined and distributed by the flow cross-sectional areas of the first flow path and the second flow path, and the first branch concentrated water and the second branch concentrated water flowing out from the first water outlet and the second water outlet of the valve body respectively correspond to each other.

9. The water purification system according to claim 1, characterized in that, The mixing water tank includes: A first cavity, the first branch concentrated water enters the first cavity through the second water inlet of the mixing water tank, and the initial water enters the first cavity through the first water inlet of the mixing water tank; A mixing water flow path, its first end is communicated with the first cavity, and the second end of the mixing water flow path forms the water return port of the mixing water tank or the water return port of the mixing water tank is communicated with the second end of the mixing water flow path; wherein: The mixing water flow path is used to make the water passing through its interior change the water flow direction at least twice to mix the initial water and the concentrated water into raw water.

10. The water purification system according to claim 9, wherein, A plurality of partition plates are arranged along the extending direction of the mixing water flow path, and an over-flow gap for water to pass through is correspondingly formed at each partition plate, and the plurality of over-flow gaps are arranged up and down and / or left and right in the four directions of the cross-section of the mixing water flow path.

11. The water purification system according to claim 9, wherein, The mixing water tank further includes a second cavity, the second cavity is communicated with the second end of the mixing water flow path to receive the raw water flowing out from the second end of the mixing water flow path; the water return port is formed in the second cavity.

12. The water purification system according to claim 11, wherein, An ion concentration sensor for checking the ion concentration of the raw water is arranged at the port of the second end of the mixing water flow path and / or arranged in the second cavity.

13. The water purification system according to any one of claims 9 to 11, characterized in that The first water inlet and the second water inlet of the mixing water tank are arranged one below the other; wherein: The second water inlet of the mixing water tank is located above the first water inlet of the mixing water tank.

14. The water purification system according to claim 13, wherein A one-way valve is arranged at the second water inlet of the mixing water tank, and the one-way valve includes: A valve core, which is pivotally connected to the side wall of the first cavity, and the valve core blocks the second water inlet of the mixing water tank or opens the second water inlet of the mixing water tank by pivoting; A float, which is connected to the valve core, and the float is used to float on the liquid surface in the first cavity to control the valve core to block the second water inlet of the mixing water tank or open the second water inlet of the mixing water tank based on the liquid surface height.

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