Water purification system and water purification equipment

Abstract

The present invention discloses a water purification system and water purification equipment, which include: the water purification system includes: a membrane filter element, having a raw water inlet, a pure water inlet and a waste water inlet; a water inlet valve; a booster device; a water intake device; a water storage device, having a water storage chamber and multiple water outlets; a raw water branch, one end of which is connected to the raw water pipe at a first connection point P, and the other end is connected to the water outlet of the water storage device; a pure water reflux branch, one end of which is connected to the pure water pipe at a second connection point R, and the other end is connected to the water outlet of the water storage device; one end of the flushing branch is connected to the water outlet of the water storage device, and the other end is connected to the raw water pipe at a third connection point Q; a mixing valve, which is arranged on the flushing branch; a first one-way valve, which is arranged on the pure water reflux branch; a waste water valve or a waste water hole, which is installed on the waste water pipe or the waste water hole is opened at the waste water end of the membrane filter element. Such an arrangement is conducive to improving the life of the membrane filter element, reducing the risk of scaling of the waste water valve and reducing the TDS of the first cup of pure water in the water purification system.

Description

Technical Field

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

[0002] The drinking water problem is an issue that the public is very concerned about. It is an indisputable fact that there are many substances in the water that are harmful to health. This is also the main reason why people's awareness of healthy drinking water has been strengthened, and it is also the root cause of the booming water purification equipment market.

[0003] Existing water purification equipment mainly relies on membrane filter elements to filter raw water. However, when the water purification equipment is in standby mode, raw water, wastewater and pure water will coexist in the membrane filter element, where raw water and wastewater are both in front of the membrane filter element, and pure water is behind the membrane filter element. The total dissolved solids (TDS) values ​​of raw water and wastewater are much higher than the TDS value of pure water. If the water purification equipment is in standby mode for a long time, the ions in the raw water and wastewater of the membrane filter element will diffuse into the pure water, thereby increasing the TDS value of the pure water. When the water purification equipment is turned on to extract pure water next time, the TDS value of the first cup of pure water produced will be relatively high, affecting the user experience. At the same time, when the equipment is shut down, the membrane filter element and the wastewater valve are immersed in high-TDS wastewater, the membrane filter element is prone to scaling, resulting in performance degradation, and the wastewater valve is prone to scaling, resulting in valve blockage.

[0004] At present, the effective method to solve the above problems is mainly to clean the membrane filter element with pure water to flush out the high TDS wastewater in the membrane filter element. Therefore, a pure water storage device needs to be set up in the water purification system. First, a certain amount of pure water is stored in the pure water, and the pure water is extracted / squeezed out to flush the membrane filter element.

[0005] Most of the patents reported so far use ordinary water tanks, pressure tanks or water drive tanks.

[0006] Use ordinary water tanks for pure water flushing: A self-priming pump must be equipped to pump out pure water during flushing. This solution places high demands on the pump, resulting in increased costs; and the self-priming pump is noisy and has low flushing efficiency. At the same time, air holes must be opened on the water tank, which is prone to bacterial growth.

[0007] Using a pressure tank for flushing: The water storage efficiency of a pressure tank is very low, and the water storage volume is usually less than 50% of the actual volume; and the airbag cannot completely discharge the pure water stored in the pressure tank, so the flushing efficiency is low; and as the pressure tank is used, the airbag will gradually leak, and the amount of pure water that can be squeezed out will become less and less.

[0008] Using a water drive tank for flushing: The water drive tank is equipped with an elastic diaphragm to divide the tank into two independent chambers, which has a complex structure and high cost. In addition, the water drive tank works under high pressure for a long time, and the diaphragm is very easy to rupture, resulting in water leakage between the two chambers and system failure.

[0009] In addition, the inner cavity of the pressure tank and the water drive tank can only be made into a cylindrical tank shape, which is difficult to design into other shapes and has poor applicability.

[0010] In addition, the above three water storage devices must be equipped with additional signal feedback equipment (such as water level sensors, flow sensors, high-pressure switches, flow switches, etc.) for use in conjunction, which will increase the complexity and cost of the system. Summary of the invention

[0011] The main purpose of the present invention is to propose a water purification system, which is designed to flush the membrane filter element when the water purifier stops making water, discharge the concentrated water with high TDS in the membrane filter element, and immerse the membrane filter element and the wastewater valve in low TDS water, so as to greatly reduce the TDS of the first cup of water produced when the water purifier makes water again, and at the same time extend the service life of the membrane filter element and the wastewater valve. And the water purification system can also be used in conjunction with the wastewater recovery system to recover part of the wastewater. In order to solve the problems encountered by the above-mentioned water storage device, this patent has developed a new cleaning method, using a water storage device with a water storage chamber (all multiple water storage chambers connected to each other are regarded as one) and multiple interconnected water ports, which are used to store raw water and pure water and mixed water formed by the mixture of raw water and pure water. When flushing, the water stored in the water storage device is used to flush the membrane filter element.

[0012] The present invention provides a water purification system, comprising:

[0013] The membrane filter element has a raw water inlet connected to the raw water pipe, a pure water inlet connected to the pure water pipe, and a waste water inlet connected to the waste water pipe;

[0014] A water inlet valve, installed on the raw water pipe;

[0015] A pressure boosting device, installed on the raw water pipe between the water inlet valve and the membrane filter element;

[0016] A water intake device, installed on the pure water pipe;

[0017] A water storage device, comprising a water storage chamber and a plurality of water outlets interconnected with each other, for storing one of raw water, pure water and mixed water formed by mixing raw water and pure water;

[0018] A raw water branch, one end of which is connected to the raw water pipe between the raw water inlet and the water inlet valve at a first connection point P, and the other end of which is connected to the water outlet of the water storage device, so that the raw water flows into the water storage cavity through the raw water branch;

[0019] A pure water reflux branch, one end of which is connected to the pure water pipe between the pure water port of the membrane filter element and the water intake device at the second connection point R, and the other end is connected to the water outlet of the water storage device, so that the pure water produced by the membrane filter element flows into the water storage chamber through the pure water reflux branch;

[0020] A flushing branch, one end of which is connected to the water outlet of the water storage device, and the other end of which is connected to the raw water pipe between the water inlet valve and the booster device at a third connection point Q, so that the water stored in the water storage device flows into the membrane filter element through the flushing branch to flush the membrane filter element;

[0021] A water mixing valve, the water mixing valve is arranged on the flushing branch;

[0022] A first one-way valve, which is arranged on the pure water return branch to limit the flow of raw water to the pure water pipe through the pure water return branch;

[0023] And, a wastewater valve or a wastewater hole, wherein the wastewater valve is installed on the wastewater pipe or the wastewater hole is opened at the wastewater end of the membrane filter element to control the wastewater flow.

[0024] Preferably, the water purification system further comprises a pure water reflux valve, which is arranged on the pure water reflux pipe to control the pure water produced by the membrane filter element to reflux without passing through the pure water reflux branch during normal water production.

[0025] Preferably, the water purification system further comprises a second one-way valve, which is arranged on the raw water branch to restrict the pure water produced by the membrane filter element from flowing back into the raw water pipe through the raw water branch during normal water production.

[0026] Preferably, the water purification system further comprises a controller, which is electrically connected to the water inlet valve, the water mixing valve, the pressure boosting device, the water intake device and the pure water return valve respectively, and when the controller receives a water production signal and a flushing signal, controls the water inlet valve, the water mixing valve, the pressure boosting device and the pure water return valve to open / close respectively;

[0027] The flushing signal includes a flushing first stage signal and a flushing second stage signal.

[0028] When the controller receives the flushing first stage signal, it controls the water inlet valve to open, the water mixing valve to open or close, the booster device to open, and the pure water reflux valve to open, so that the pure water produced by the membrane filter element flows into the water storage device through the pure water reflux branch;

[0029] When the controller receives the flushing second stage signal, it controls the water inlet valve to close, the water mixing valve to open, the booster device to open or close, and the pure water reflux valve to open or close, so that the water stored in the flushing first stage water storage device flows into the membrane filter element through the flushing branch to flush the membrane filter element.

[0030] Preferably, the water purification system further comprises a controller, which is electrically connected to the water inlet valve, the water mixing valve, the pressure boosting device, the water intake device and the pure water return valve respectively, and when the controller receives a water production signal and a flushing signal, controls the water inlet valve, the water mixing valve, the pressure boosting device and the pure water return valve to open / close respectively;

[0031] The flushing signal includes a first-stage flushing signal and a second-stage flushing signal.

[0032] When the controller receives the flushing signal of the first stage, it controls the water inlet valve to open, the water mixing valve to open, and the booster device to open, so that the pure water produced by the membrane filter element flows into the water storage device through the pure water return branch;

[0033] When the controller receives the second stage flushing signal, it controls the water inlet valve to close, the water mixing valve to open, and the booster to open or close, so that the water stored in the water storage device during the first stage flushing flows into the membrane filter element through the flushing branch to flush the membrane filter element.

[0034] Preferably, a guide pipe or a partition is provided in the water storage device to separate the water storage chamber into two interconnected parts to control the degree of mixing of raw water and pure water with the water in the original water storage device when the raw water and pure water are filled into the water storage device.

[0035] Preferably, the water purification system further comprises a pressure reducing valve, which is installed on the raw water pipe before the third connection point P.

[0036] Preferably, the water inlet system includes a wastewater recovery system, and the wastewater recovery system includes a second water inlet valve, a wastewater return pipe, and a third one-way valve;

[0037] a second water inlet valve, the second water inlet valve being located on the wastewater pipeline after the wastewater valve;

[0038] A wastewater return pipe, wherein the water inlet end of the wastewater return pipe is connected to the wastewater pipe between the wastewater valve and the second water inlet valve, and the water outlet end of the wastewater return pipe is connected to the raw water pipe or the raw water branch or the mixed water branch between the water storage device and the mixing water valve or the pure water return branch between the water storage device and the first one-way valve at a fourth connection point N to recycle wastewater;

[0039] Alternatively, the wastewater recovery system includes a one-inlet and two-outlet valve, a wastewater return pipe, and a third one-way valve;

[0040] A one-inlet and two-outlet valve, wherein the water inlet is located on the wastewater pipeline after the wastewater valve, one of the water outlets is connected to the wastewater return pipe for recycling wastewater, and the other water outlet is used to directly discharge wastewater;

[0041] A wastewater return pipe, wherein the water inlet end of the wastewater return pipe is connected to a water outlet of an inlet-two-outlet valve, and the water outlet end is connected to the raw water pipe or the raw water branch or the mixing water branch between the water storage device and the mixing water valve or the pure water return branch between the water storage device and the first one-way valve at the fourth connection point N to recycle the wastewater.

[0042] Preferably, the water inlet system includes a third one-way valve, and the third one-way valve is one-way from the wastewater outlet of the membrane filter element to the fourth connection point N. The optimized third one-way valve may have a starting pressure, and water cannot pass from the wastewater outlet of the membrane filter element to the fourth connection point N when the water pressure is lower than the starting pressure.

[0043] Preferably, the water purification system further comprises a timing device, which is used to detect the water production duration, water production stop duration, and the duration of the first stage flushing and the second stage flushing of the water purification system;

[0044] The controller is also electrically connected to the timing device, and the controller controls the water inlet valve, the water mixing valve, the booster device, the pure water return valve of the water purification system, and the second water inlet valve to operate according to the detection result of the timing device, so as to perform the first / second stage flushing on the membrane filter element;

[0045] The controller flushes the membrane filter element once every certain period of time according to the timing result of the timing device;

[0046] The controller controls the operation of the second water inlet valve or the one-inlet-two-outlet valve according to the timing result of the timing device to recover the wastewater.

[0047] Preferably, the water purification system further comprises a first flow detection device, which is installed on the pure water return branch;

[0048] The controller is also electrically connected to the first flow detection device. According to the detection result of the first flow detection device, the controller controls the water inlet valve, the boosting device, the mixing valve and the pure water return valve of the water purification system to end the first stage flushing and switch to the second stage flushing.

[0049] Preferably, the water purification system further comprises a second flow detection device, which is installed on the raw water branch or the waste water pipeline;

[0050] The controller is also electrically connected to the second flow detection device. According to the detection result of the second flow detection device, the controller controls the water inlet valve, the boosting device, the mixing valve and the pure water return valve of the water purification system to end the second stage of flushing.

[0051] Preferably, the water purification system also includes a first TDS sensor device, which is installed on the raw water branch or the mixed water branch; the controller is also electrically connected to the TDS sensor device, and the controller controls the operation of the water inlet valve, the boosting device, the mixing valve and the pure water return valve of the water purification system according to the detection result of the first TDS sensor device to end the first stage flushing and switch to the second stage flushing.

[0052] Preferably, the water purification system also includes a second TDS sensor device, which is installed on a mixing water branch or a wastewater pipe; the controller is also electrically connected to the TDS sensor device, and the controller controls the operation of the water inlet valve, the boosting device, the mixing water valve and the pure water return valve of the water purification system according to the detection result of the second TDS sensor device to end the second stage of flushing.

[0053] Preferably, the water purification system further comprises a third TDS sensor device, which is installed on the wastewater pipeline; the controller is also electrically connected to the TDS sensor device, and the controller controls the operation of the water inlet valve, the booster device, the mixing valve and the pure water return valve of the water purification system according to the detection result of the third TDS sensor device to end the second stage of flushing;

[0054] The controller controls the operation of the second water inlet valve or the one-inlet-two-outlet valve according to the detection result of the third TDS sensor device to recycle waste water.

[0055] Preferably, the water purification system further comprises a pressure detection device, and the pressure detection device is installed on the pure water pipeline;

[0056] The controller of the water purification system is also electrically connected to the pressure detection device. When the controller receives the signal detected by the pressure detection device, it triggers the system to enter the normal water production or flushing program, and controls the operation of the water inlet valve, the boosting device, the second water inlet valve of the water purification system, the mixing valve and the pure water return valve of the water purification system to perform water production / flushing.

[0057] Preferably, the water purification system further comprises a third flow sensor, and the third flow sensor is installed on the pure water pipe;

[0058] The controller of the water purification system is also electrically connected to the third flow sensor. When the controller receives the signal detected by the third flow sensor, it triggers the system to enter a normal water production or cleaning procedure, and controls the operation of the water inlet valve, the boosting device, the second water inlet valve of the water purification system, the mixing valve and the pure water return valve of the water purification system to produce water / flushing.

[0059] Preferably, the water storage device, the water mixing valve and the first one-way valve are connected to form a water storage assembly, and the water storage assembly can be independently detached as a whole and installed in the water purification system.

[0060] The present invention further provides a water purification device, comprising:

[0061] shell;

[0062] A water purification system, wherein the water purification system is installed in the housing;

[0063] Wherein, the water purification system comprises:

[0064] The membrane filter element has a raw water inlet connected to the raw water pipe, a pure water inlet connected to the pure water pipe, and a waste water inlet connected to the waste water pipe;

[0065] A water inlet valve, installed on the raw water pipe;

[0066] A pressure boosting device, installed on the raw water pipe between the water inlet valve and the membrane filter element;

[0067] A water intake device, installed on the pure water pipe;

[0068] A water storage device, comprising a water storage chamber and a plurality of water outlets interconnected with each other, for storing one of raw water, pure water and mixed water formed by mixing raw water and pure water;

[0069] A raw water branch, one end of which is connected to the raw water pipe between the raw water inlet and the water inlet valve at a first connection point P, and the other end of which is connected to the water outlet of the water storage device, so that the raw water flows into the water storage cavity through the raw water branch;

[0070] A pure water reflux branch, one end of which is connected to the pure water pipe between the pure water port of the membrane filter element and the water intake device at the second connection point R, and the other end is connected to the water outlet of the water storage device, so that the pure water produced by the membrane filter element flows into the water storage chamber through the pure water reflux branch;

[0071] A flushing branch, one end of which is connected to the water outlet of the water storage device, and the other end of which is connected to the raw water pipe between the water inlet valve and the booster device at a third connection point Q, so that the water stored in the water storage device flows into the membrane filter element through the flushing branch to flush the membrane filter element;

[0072] A water mixing valve, the water mixing valve is arranged on the flushing branch;

[0073] A first one-way valve, which is arranged on the pure water return branch to limit the flow of raw water to the pure water pipe through the pure water return branch;

[0074] And, a wastewater valve or a wastewater hole, wherein the wastewater valve is installed on the wastewater pipe or the wastewater hole is opened at the wastewater end of the membrane filter element to control the wastewater flow.

[0075] The technical solution of the present invention uses a water storage device having a water storage chamber (all multiple interconnected water storage chambers are regarded as one) and multiple interconnected water outlets for storing raw water, pure water, and mixed water formed by the mixture of raw water and pure water. During flushing, the pure water or the mixed water of low-TDS pure water and raw water stored in the water storage device is first used (first stage flushing), and then the water stored in the water storage device is used to flush the membrane filter element (second stage flushing). The number of water outlets can be two or three. Taking a water storage device with three water outlets as an example, one water outlet of the water storage device is connected to the raw water pipe between the raw water outlet and the water inlet valve via a raw water branch, so that the raw water flows into the water storage chamber; the second water outlet is connected to the pure water pipe between the pure water outlet of the membrane filter element and the water intake device via a pure water reflux branch, so that the pure water produced by the membrane filter element flows into the water storage chamber; the third water outlet is connected to the raw water pipe between the water inlet valve and the boosting device via a flushing branch. When a certain amount of pure water or a mixture of raw water with pure water as the main body and pure water is loaded into the water storage device, the water stored in the water storage device flows into the membrane filter element to flush the membrane filter element.

[0076] Such a setting ensures that when the water purification system is in standby mode, no ion penetration problem occurs in the membrane filter element, thereby ensuring that the water quality of the first cup of pure water obtained when the water purification system is started next time can meet the needs of users; and extends the service life of the membrane filter element and reduces the risk of wastewater valve blockage.

[0077] In addition, by arranging the water storage chambers in the water storage device to be connected, the flushing process in the present application will not cause multi-chamber water leakage (avoiding the occurrence of "bag explosion" of the water drive tank and rupture of the diaphragm, which will cause multiple chambers of the water storage device to be connected) and cause system failure; since the water storage device is only used to store water and does not contain air bags / diaphragms, the shape of the water storage device can be set to any shape according to actual needs, which is conducive to the full and reasonable use of the space of the water treatment equipment (with a water purification system) and makes the water treatment equipment compact and stable.

[0078] The water storage device in the present application does not need to install additional signal feedback equipment to determine whether the water storage chamber is full or charged with a certain amount of pure water, which greatly reduces the complexity and manufacturing cost of the product and improves the system reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0079] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0080] Figure 1It is a structural schematic diagram of an embodiment of a water purification system of the present invention;

[0081] Figure 2 for Figure 1 A schematic diagram of a state structure of the embodiment during implementation;

[0082] Figure 3 for Figure 1 A schematic diagram of another state structure of the embodiment during implementation;

[0083] Figure 4 for Figure 1 A schematic diagram of another state structure of the embodiment during implementation;

[0084] Figure 5 for Figure 1 A schematic diagram of another state structure of the embodiment during implementation;

[0085] Figure 6 It is a structural schematic diagram of another embodiment of the water purification system of the present invention;

[0086] Figure 7 It is a structural schematic diagram of another embodiment of the water purification system of the present invention;

[0087] Figure 8 It is a structural schematic diagram of another embodiment of the water purification system of the present invention;

[0088] Fig. 9 It is a structural schematic diagram of another embodiment of the water purification system of the present invention;

[0089] Fig.10 It is a structural schematic diagram of another embodiment of the water purification system of the present invention;

[0090] Fig.11 It is a structural schematic diagram of another embodiment of the water purification system of the present invention.

[0091] Description of Figure Numbers:

[0092]

[0093] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0094] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0095] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back...), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0096] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0097] In order to sufficiently reduce the TDS value in the first cup of water in a water purifier, extend the life of a membrane filter element and reduce the risk of a wastewater valve being blocked, the present invention proposes a water purification system and a control method thereof. Figure 1 This is the simplest implementation method of the invention.

[0098] Please refer to Figure 1 In this embodiment, the water storage device has three independent water inlets, or has two independent water inlets. The water purification system 100 includes a membrane filter element 10, a water inlet valve 15, a booster device 20, a water intake device 25, a water mixing valve 30, a water storage device 35 and other components.

[0099] The membrane filter element 10 has a raw water inlet, a pure water inlet and a waste water inlet; wherein the raw water inlet of the membrane filter element 10 is connected to a raw water pipe a (i.e., a tap water pipe or a water pipe connected to a water source); the pure water inlet of the membrane filter element 10 is connected to a pure water pipe b for discharge of pure water produced by the membrane filter element 10; the waste water inlet of the membrane filter element 10 is connected to a waste water pipe c for discharge of waste water generated when the membrane filter element 10 produces pure water.

[0100] The water inlet valve 15 can be a solenoid valve or a manual mechanical valve. The water inlet valve 15 is not specifically limited here. The water inlet valve 15 is installed on the raw water pipe a. It is in an open state when the water purification system 100 produces pure water, and it is in a closed state when the water purification system 100 is on standby.

[0101] Taking a booster pump as an example, the booster device 20 is installed on the raw water pipe a. Preferably, the booster pump 20 is installed on the raw water pipe a between the membrane filter element 10 and the water inlet valve 15. The booster pump 20 not only drives the raw water in the raw water pipe a to flow into the membrane filter element 10, but also increases the water pressure of the raw water in the raw water pipe a to ensure that the water pressure of the raw water flowing into the membrane filter element 10 is high enough, thereby ensuring that the membrane filter element 10 can normally produce pure water.

[0102] Preferably, the booster pump 20 is a variable frequency booster pump 20. Since the frequency of the variable frequency booster pump 20 is adjustable, it is convenient for the user to adjust the working frequency of the variable frequency booster pump 20 according to his own needs. When the user needs to obtain a large amount of pure water in a short period of time, the user can increase the working frequency of the variable frequency booster pump 20. At this time, the amount of raw water passing through the variable frequency booster pump 20 per unit time will be relatively large, thereby ensuring that the amount of raw water entering the membrane filter element 10 per unit time will also increase accordingly, which is beneficial to increase the amount of pure water produced by the membrane filter element 10 per unit time; when the user needs to obtain a small amount of pure water in a short period of time, the user can lower the working frequency of the variable frequency booster pump 20. At this time, the amount of raw water passing through the variable frequency booster pump 20 per unit time is relatively small, but the raw water entering the membrane filter element 10 can be fully filtered, which is beneficial to improve the utilization rate of water resources.

[0103] The water intake device 25 can be a solenoid valve or a manual mechanical valve, and the water intake device 25 is not specifically limited here; the water intake device 25 is installed at the water outlet of the pure water pipe b, and is in an open state when the user takes pure water, and is in a closed state when the user finishes taking water. The water intake device 25 can also be an intelligent water intake device, and when the water intake device is opened or closed, it will automatically transmit an opening or closing signal to the controller, and can have the function of detecting the water quality of the outlet water.

[0104] The water storage device of the water intake device has a water storage chamber (multiple water storage chambers that are interconnected are regarded as one) and multiple water outlets that are interconnected, and is used to store raw water, pure water, and mixed water formed by the mixture of raw water and pure water;

[0105] Taking a water storage device with three water outlets as an example, one water outlet of the water storage device is connected to point P through a raw water branch and a raw water pipe between the raw water outlet and the water inlet valve, so that the raw water flows into the water storage chamber; the second water outlet is connected to point R through a pure water reflux branch and a pure water pipe between the pure water outlet of the membrane filter element and the water intake device, so that the pure water produced by the membrane filter element flows into the water storage chamber; the third water outlet is connected to point Q through a flushing branch and a raw water pipe between the water inlet valve and the boosting device. When a certain amount of pure water or a mixture of raw water with pure water as the main component and pure water is loaded into the water storage device, the water stored in the water storage device flows into the membrane filter element to flush the membrane filter element;

[0106] In some embodiments, in order to control the degree of mixing of raw water and pure water in the water storage chamber, a guide tube, a guide baffle, or a partition is provided in the water storage device to separate the water storage device into two interconnected parts, so as to reduce the degree of mixing of pure water with water in the original water storage device when the pure water is filled into the water storage device. There are many ways to achieve the reduction of the degree of mixing, for example, a plurality of mutually isolated flow channels are arranged side by side in the water storage chamber, one end of the flow channel is connected to the first end, and the other end is connected to the second end, so that a large amount of water in the water storage device is located in the flow channel, and when the second end is filled with pure water, the pure water squeezes the water in the flow channel toward the first end. Since the cross-sectional area of ​​each flow channel is relatively small, it is difficult for water to mix in the flow channel.

[0107] In some embodiments, in order to avoid backflow, the water purification system is further provided with a first one-way valve 105, which is installed on the pure water return pipe and is used to limit water to flow from the pure water pipe to the water storage tank and the raw water branch, and prevent water from flowing into the pure water pipe through the pure water return pipe;

[0108] A water mixing valve is provided on the flushing branch to control the flushing process;

[0109] A wastewater valve is installed on the wastewater pipe to control the wastewater flow rate.

[0110] The "wastewater valve" in the water purification industry refers to a solenoid valve with a small hole. When the solenoid valve of the wastewater valve is closed, the wastewater can only flow out from the small hole, and its flow rate is limited. The flow rate depends on the water pressure and the size of the small hole. When the solenoid valve of the wastewater valve is opened, the wastewater valve is fully open, and the wastewater can flow out directly through the solenoid valve. At this time, the wastewater valve does not have a flow limiting effect.

[0111] It is also possible to optimize by directly setting a wastewater hole at the wastewater outlet of the membrane filter element to replace the wastewater valve to limit the wastewater flow.

[0112] It is worth noting that the water storage device, the mixing valve and the first one-way valve can be used as a whole water storage component, thereby realizing that the water storage component is used as an external device, and can be installed, disassembled and replaced as a whole according to the needs of the user, which is conducive to the maintenance and assembly of the water purification system. Specifically, the water storage device, the mixing valve and the first one-way valve are connected to form a water storage component, and the water storage component can be independently disassembled and installed in the water purification system. In this way, the water storage component can be used as an accessory of a water purification device, which can be conveniently installed, disassembled and replaced according to actual conditions.

[0113] It is worth noting that in some other embodiments, the reflux valve can also be used as a part of the water storage assembly, that is, the water storage assembly also includes the reflux valve. In this way, the adaptability and versatility of the water storage assembly can be further improved.

[0114] The working principle of the water purification system will be briefly introduced below: wherein the water storage device takes a water storage tank as an example;

[0115] The flushing of the membrane filter element is divided into two stages: the first stage flushing and the second stage flushing.

[0116] The first stage of flushing mainly involves filling the water storage device with pure water or a mixture of raw water mainly composed of pure water and pure water;

[0117] In the second stage, the membrane filter element is mainly flushed with pure water stored in the first stage of the water storage device or a mixture of raw water mainly composed of pure water and pure water.

[0118] When the water intake switch is turned off, the specific control process and working principle of the water purification system are as follows:

[0119] First stage flushing: When the water intake switch is closed, pure water can be filled into the water storage tank by controlling the water inlet valve to open, the mixing valve to open / close, and the booster device to open.

[0120] Second stage flushing: When a preset amount of pure water is filled into the water storage tank, the pure water stored in the water storage tank can be squeezed out for flushing the membrane filter element by controlling the water inlet valve to close, the mixing valve to open, and the booster device to open / close.

[0121] Table 1 is a table of flushing modes and working status of various water circuit components, where pipes with water flowing through are represented by solid lines, and pipes without water flowing through are represented by dotted lines.

[0122]

[0123] The following describes in detail some embodiments of the present invention:

[0124] Embodiment 1, refer to Figure 6 In order to limit the pure water backflow through the pure water return branch when the system is producing water normally, resulting in a significant reduction in the pure water flow rate of the water purification system,

[0125] The optimized pure water return valve 104 can be set on the pure water return branch. The structural diagram of the specific implementation method is shown in Figure 6 In this embodiment, the water storage device is provided with three water inlets as an example. The water inlet valve 104 can be a solenoid valve or a manual mechanical valve, and the water inlet valve 104 is not specifically limited here.

[0126] like Figure 6In the embodiment, when the user needs to draw water, the water intake device 25 is opened. When the controller receives the signal that the water intake device 25 is opened, the control circuit of the water inlet valve 15, the mixing valve 30, the boosting pump 20 and the pure water return valve 105 is triggered to control the water inlet valve 15 and the boosting pump 20 to open, the mixing valve 30 to open or close, and the pure water return valve 105 to close, so that the raw water enters the membrane filter element 10 through the raw water pipe a and is filtered, and the pure water produced by the membrane filter element 10 is discharged through the pure water pipe b for the user to take, and the waste water generated by the membrane filter element 10 in producing pure water is discharged through the waste water pipe c.

[0127] When the user finishes taking water, the water intake device 25 will be closed. When the controller receives the signal that the water intake device 25 is closed, the first stage of flushing is performed: the controller triggers the control circuit of the water inlet valve 15, the booster pump 20, the second water inlet valve 107 and the pure water return valve 104 to control the water inlet valve 15 and the booster pump 20 to continue to remain in the open state, and at the same time controls the pure water return valve 104 to open and the mixing valve to close. At this time, the pure water produced by the membrane filter element 10 flows into the water storage chamber of the water storage device 35 through the pure water return pipe d, and squeezes out the original water in the water storage chamber. The squeezed water flows into the raw water pipe through the mixing branch e. ​​(Working principle see Figure 2 )

[0128] Or when the user finishes taking water, the water intake device 25 will be closed. When the controller receives the signal that the water intake device 25 is closed, the first stage of flushing is performed: the controller triggers the control circuit of the water inlet valve 15, the booster pump 20, the second water inlet valve 107 and the pure water reflux valve 104 to control the water inlet valve 15 and the booster pump 20 to continue to remain open, and at the same time control the pure water reflux valve 104 and the mixing valve to open. At this time, the pure water produced by the membrane filter element 10 flows into the water storage chamber of the water storage device 35 through the pure water reflux pipe d, and squeezes out the original water in the water storage chamber. The squeezed water flows into the raw water pipe through the raw water branch f. (Working principle see Figure 3 )

[0129] When a certain amount of pure water is loaded into the water storage device, the second stage of flushing begins: the controller triggers the control circuits of the water inlet valve 15, the booster pump 20, the second water inlet valve 107 and the pure water reflux valve 104 to control the water inlet valve 15 to close and the booster pump 20 to continue to remain in the open state, and at the same time controls the pure water reflux valve 104 to remain in the open state, and the mixing valve 30 to open, so that the raw water flows into the water storage device through the raw water branch f, and at the same time, the pure water produced by the membrane filter element flows back to the water storage device through the pure water reflux branch d, and the pure water stored in the water storage device in the previous stage is squeezed into the membrane filter element to flush the membrane filter element. Part of the water is purified into pure water again, and flows back to the water storage device through the pure water reflux path d again, and the other part of the water carries the TDS in the membrane filter element and is discharged from the wastewater end. (See the working principle for details.) Figure 4 )

[0130] Or when a certain amount of pure water is loaded into the water storage device, the controller triggers the control circuit of the water inlet valve 15, the booster pump 20, the second water inlet valve 107 and the pure water return valve 104 to control the closing of the water inlet valve 15, the booster pump 20, the pure water return valve 104 and the opening of the mixing valve 30, so that the raw water flows into the water storage device through the raw water branch f, squeezes the pure water stored in the water storage device in the previous stage into the membrane filter element, rinses the membrane filter element, and discharges the high-concentration raw water and concentrated water in the membrane filter element from the wastewater end. (See the working principle for details) Figure 5 )

[0131] After such configuration, the membrane filter element is filled with a mixture of pure water and raw water dominated by pure water or low TDS pure water, so that ion penetration will basically not occur in the membrane filter element 10, thereby ensuring that the first cup of pure water produced by the water purification system 100 when it is turned on for water production next time can meet the needs of users; at the same time, the membrane filter element and the wastewater valve are immersed in low TDS water, thereby extending the service life of the membrane filter element and reducing the risk of valve clogging of the wastewater valve.

[0132] In addition, by arranging the water storage chambers in the water storage device to be connected, the flushing process in the present application will not cause multi-chamber water leakage (due to avoiding the rupture of the diaphragm of the water drive tank "bursting" and connecting the multiple chambers of the water storage device) and cause the flushing system to fail. Since the water storage device is only used to store water and does not contain an air bag / diaphragm, it does not need to deform itself or cooperate with other components. Therefore, the shape of the water storage device can be set to any shape according to actual needs, which is conducive to the full and reasonable use of the space of the water treatment equipment (having a water purification system) and makes the water treatment equipment compact and stable.

[0133] The water storage device uses an ordinary container with multiple outlets (no air holes are required) as a water storage device. This water storage device can store both raw water and pure water. When pure water is filled, the pure water will squeeze out the original water in the water storage chamber. When flushing is required, raw water or mixed water formed by raw water and pure water is used to squeeze pure water into the membrane filter element for flushing the membrane filter element. The flushing system is simple and reliable, and achieves a good flushing effect at a low cost.

[0134] The water purification system of this patent can also be equipped with a wastewater reuse system to recycle part of the wastewater to improve the actual pure water recovery rate of the system and save water resources.

[0135] When the water purifier is producing water normally, the TDS of the wastewater discharged from the wastewater outlet is very high, usually 2-4 times that of the raw water. This part of the wastewater cannot be recycled (recycling is recommended only when the raw water quality is very good). Forced reuse will increase the burden on the membrane filter element, causing the membrane filter element to decay more rapidly, and at the same time will cause the quality of the produced pure water to deteriorate. However, after the membrane filter element is rinsed with pure water, the membrane filter element is filled with low-TDS water. When the water purifier produces water again, this low-TDS water will become concentrated water and be discharged from the wastewater outlet first. Therefore, the TDS of this part of concentrated water discharged first when the water purifier produces water again is very low. It is even lower than the TDS of the raw water and can be reused. In actual recycling, this part of the wastewater will flow back to the front of the pump for reuse in water production, or flow back to the water storage device for storage.

[0136] Reference Figure 6 A wastewater valve 95 and a second water inlet valve 107 are provided on the wastewater pipe c, and the wastewater valve 95 is located between the second water inlet valve 107 and the wastewater outlet of the membrane filter element; the water inlet end of the wastewater return pipe is connected to the wastewater pipe c between the wastewater valve and the second water inlet valve 107, and the water outlet end of the wastewater return pipe h is connected to the raw water pipe a, or the raw water branch f or the mixed water branch e between the water storage device and the mixing water valve, or the pure water return branch d between the water storage device and the first one-way valve at the fourth connection point N to recycle the wastewater.

[0137] When the second water inlet valve 107 is opened, the waste water is directly discharged through the waste water pipe; when the second water inlet valve 107 is closed, the waste water flows back through the waste water return pipe. This arrangement can recycle part of the waste water, improve the actual pure water recovery rate of the system, and save water resources.

[0138] The third one-way valve 115 is optimally provided on the wastewater return branch to limit the raw water from flowing directly out of the wastewater end through the wastewater return pipeline h.

[0139] Due to the suction force of the booster pump, the water pressure in the raw water pipe is actually lower than the pressure of the raw water. In order to limit the low raw water pressure (lower than 0.15 MPa), the wastewater automatically flows back through the wastewater return branch. The optimal one can use a one-way valve with a starting pressure (such as a bypass valve and a pressure relief valve), that is, when the water pressure is lower than the starting pressure, the water cannot pass through the one-way valve in the forward direction. Only when the water pressure is higher than the starting pressure can the water pass through the one-way valve in the forward direction. With this setting, when the second water inlet valve is opened, even if the raw water pressure is extremely low, the wastewater pressure is lower than the starting pressure, and the wastewater cannot flow back through the wastewater return pipe h.

[0140] Example 2, refer to Figure 7 , a one-inlet-two-outlet valve 108 (three-way valve) is used to replace the second water inlet valve for wastewater reflux. Its water inlet is located on the wastewater pipeline after the wastewater valve, one of its water outlets is connected to the wastewater reflux pipe for recycling wastewater, and the other water outlet is connected to the wastewater pipe for directly discharging wastewater.

[0141] A wastewater return pipe, one end of which is connected to a water outlet of an inlet-two-outlet valve, and the other end is connected to the raw water pipe or the raw water branch or the mixing water branch between the water storage device and the mixing water valve or the pure water return direct pipeline between the water storage device and the first one-way valve at the fourth connection point N to recycle the wastewater.

[0142] When the outlet of the wastewater pipe connected to the one-inlet-two-outlet valve 107 is opened, the wastewater is directly discharged through the wastewater pipe; when the outlet of the second water inlet valve connected to the wastewater return pipe is opened, the wastewater flows back through the wastewater return pipe. This arrangement can recycle part of the wastewater, improve the actual pure water recovery rate of the system, and save water resources.

[0143] In some embodiments, in order to improve the smoothness of pure water reflux, the water purification system further includes a pressure reducing valve 36, which is installed on the raw water pipe a before the third connection point P. The pressure reducing valve 36 is used to reduce the pressure of the raw water, reduce the back pressure of the pure water reflux during flushing, and improve the flushing effect.

[0144] Signal feedback control procedure of the above embodiment

[0145] Taking into account that when the user uses the water purification system 100, it is necessary to control the opening or closing of different components of the water purification system 100 in different time periods, which brings inconvenience to the user. In view of this, the water purification system 100 of the present invention also includes a controller (not shown in the figure), and the controller can be a single-chip microcomputer or a PWM controller. The controller is electrically connected to the water inlet valve 15, the booster pump 20, the water intake device 25, the second water inlet valve 107 and the pure water reflux valve 104 in the water purification system 100, respectively. When the water purification system 100 is in different states, the controller controls the operation of corresponding components of the water purification system 100.

[0146] When the user needs to take water, the water intake device 25 will be opened. When the controller receives the signal that the water intake device 25 is turned on, the control circuits of the water inlet valve 15, the mixing valve 30, the boosting pump 20 and the pure water reflux valve 104 are triggered to control the water inlet valve 15 and the boosting pump 20 to open, the mixing valve 30 to open or close, and the pure water reflux valve 104 to close so that the raw water enters the membrane filter element 10 through the raw water pipe a and is filtered. The pure water produced by the membrane filter element 10 is discharged through the pure water pipe b for the user to take, and the waste water generated by the membrane filter element 10 in producing pure water is discharged through the waste water pipe c or recovered through the waste water reflux pipe h.

[0147] When the user finishes taking water, the water taking device 25 will be closed. When the controller receives the signal that the water taking device 25 is closed, the first stage of flushing is performed: the controller triggers the control circuits of the water inlet valve 15, the booster pump 20, the second water inlet valve 107 and the pure water return valve 104 to control the water inlet valve 15 and the booster pump 20 to continue to remain in the open state, and at the same time controls the pure water return valve 104 to remain in the open state, and the mixing valve is opened / closed. At this time, the pure water produced by the membrane filter element 10 flows into the water storage cavity of the water storage device 35 through the pure water return pipe d, and squeezes out the original water in the water storage cavity. The squeezed water passes through the mixing water branch e ( Figure 2 ) or raw water branch f ( Figure 3 ) into the raw water pipe.

[0148] When the controller receives a signal that the water storage chamber is filled with pure water for a first preset time (timer), or when the controller receives a signal that the amount of pure water in the water storage chamber reaches a first preset volume (first flow detection device 45), or when the controller receives a signal that the TDS of water discharged from the water storage chamber is lower than the first preset TDS value (first TDS sensor 110), the second stage of flushing is performed: the controller triggers the control circuit of the pure water reflux valve 104 to control the closing of the water inlet valve 15 and the opening / closing of the booster pump 20, and at the same time controls the opening / closing of the pure water reflux valve 104 and the opening of the mixing valve 30. At this time, the pure water stored in the first stage in the water storage device is squeezed into the membrane filter element to flush the membrane filter element, thereby significantly reducing the TDS of the water in the membrane filter element 10, thereby avoiding the problem of ion diffusion in the membrane filter element 10.

[0149] When the controller receives a signal that the second stage flushing time reaches the second preset time (timer), or when the controller receives a signal that the amount of water squeezed out of the second stage flushing water storage chamber reaches the second preset volume (second flow detection device 85), or when the controller receives a signal that the TDS of water discharged from the second stage flushing water storage chamber is higher than the second preset TDS value (second TDS sensor 110), the flushing system standby ends.

[0150] Simply, the water purification system 100 can control the flushing and stopping of the membrane filter element 10 through a timer (not shown) electrically connected to the controller. When the water storage device 35 is filled with pure water for a preset first time, the controller triggers the control circuits of the water inlet valve 15, the booster pump 20, the second water inlet valve 107, and the pure water return valve 104 to end the first stage of flushing and switch to the second stage of flushing. When the second stage of flushing reaches a preset second time, the controller triggers the control circuits of the water inlet valve 15, the booster pump 20, the second water inlet valve 107, and the pure water return valve 104 to stop the second stage of flushing, and the system is on standby.

[0151] In order to more accurately confirm whether the water storage chamber of the first-stage flushing water storage device 35 is filled with a preset amount of pure water and whether the water storage chamber of the second-stage flushing water storage device 35 is discharged for flushing the membrane filter element, in one embodiment of the present invention, please refer to Figure 7 The water purification system 100 also includes a first flow detection device 45 and a second flow detection device 85. The controller is also connected to the detection results of the first / second flow detection device to trigger the control circuit of the water inlet valve 15, the booster pump 20, the pure water reflux valve 104, the mixing valve 30 and the second water inlet valve 107 to control the water inlet valve 15, the booster pump 20, the pure water reflux valve 104, the mixing valve 30 and the second water inlet valve 107 to work.

[0152] The first flow detection device 45 is installed on the pure water return branch d. When the first stage of flushing fills the water storage chamber of the water storage device 35 with pure water, the amount of pure water passing through the pure water return branch d increases with the passage of time. When the first flow detection device 45 detects that the water storage chamber is filled with a preset first volume of pure water, the second stage of flushing is triggered.

[0153] The second flow detection device 85 is installed on the raw water branch f. When the second stage flushing squeezes out the pure water stored in the water storage device 35, the amount of raw water passing through the raw water branch f increases over time. When the second flow detection device 85 detects that the amount of raw water passing through the raw water branch f in the second stage flushing reaches the preset second volume, the second stage flushing is terminated. Alternatively, the second flow detection device 85 can also be installed on the waste water pipe c. When the second stage flushing squeezes the pure water stored in the water storage device 35 to the membrane filter element for flushing, the amount of waste water discharged through the waste water pipe c increases over time. When the second flow detection device 85 detects that the amount of waste water discharged through the waste water pipe in the second stage flushing reaches the preset second volume, the second stage flushing is terminated.

[0154] In order to more accurately confirm whether the first / second stage flushing is completed, in one embodiment of the present invention, please refer to Figure 7 The water purification system 100 also includes a first TDS sensor 110 and a second TDS sensor 111. The controller is also connected to the detection results of the first / second TDS sensors to trigger the control circuits of the water inlet valve 15, the booster pump 20, the pure water reflux valve 104, the mixing valve 30 and the second water inlet valve 107 to control the water inlet valve 15, the booster pump 20, the pure water reflux valve 104, the mixing valve 30 and the second water inlet valve 107 to work.

[0155] During the first stage of flushing, the mixing valve 30 remains closed, and when pure water flows into the water storage device 35, the original water in the water storage device is squeezed out through the raw water branch f, and the first TDS sensor 110 is installed in the raw water branch. When the first stage of flushing fills the water storage cavity of the water storage device 35 with pure water, the TDS of the water squeezed out through the raw water branch f becomes lower and lower over time, and finally becomes consistent with the TDS of the pure water. When the first TDS sensor 110 detects that the TDS of the water flowing through the raw water branch f is lower than the preset first TDS value, the second stage of flushing is triggered. Or when the first stage of flushing is performed, the mixing valve 30 is opened, and when pure water flows into the water storage device 35, the original water in the water storage device is squeezed out through the mixing branch e. ​​The first TDS sensor 110 is installed on the mixing branch. When the first stage of flushing fills the water storage chamber of the water storage device 35 with pure water, the TDS of the water squeezed out through the mixing branch e becomes lower and lower over time, and finally remains consistent with the TDS of the pure water. When the first TDS sensor 110 detects that the TDS of the water flowing through the mixing branch e is lower than the preset first TDS value, the second stage of flushing is triggered.

[0156] The second TDS sensor 111 is installed on the water mixing branch e. ​​When the second stage of flushing squeezes out the stored pure water in the water storage device 35, the squeezed pure water flows into the membrane filter element 10 through the water mixing branch e for flushing. As time goes by, the TDS of the water squeezed out through the water mixing branch e will gradually increase. When the second TDS sensor 111 detects that the TDS of the water through the water mixing branch e in the second stage of flushing is higher than the preset second TDS value, the second stage of flushing is ended. Or the second TDS sensor 111 can also be installed on the waste water pipe c. When the second stage of flushing squeezes out the stored pure water in the water storage device 35 for flushing the membrane filter element, the TDS of the waste water discharged through the waste water pipe c is continuously reduced as time goes by. When the second TDS sensor 111 detects that the TDS of the waste water discharged through the waste water pipe in the second stage of flushing is lower than the preset third TDS value, the second stage of flushing is ended.

[0157] In order to avoid the phenomenon of ion diffusion in the membrane filter element 10 due to the long standby time of the water purification system 100, the water purification system 100 is also provided with a timing device (not shown), which is used to detect the standby time of the water purification system 100. The controller is electrically connected to the timing device. According to the detection result of the timing device, the controller triggers the control circuit of the water inlet valve 15, the booster pump 20, the second water inlet valve 107, the mixing valve 30 and the pure water return valve 104 to control the water inlet valve 15, the booster pump 20, the mixing valve 30, the second water inlet valve 107 and the pure water return valve 104 to work, so as to flush the membrane filter element 10. Such a setting ensures that the membrane filter element 10 of the water purification system 100 will be cleaned once every period of time, so as to ensure that the ion diffusion phenomenon will not occur inside the membrane filter element 10, and also ensure the freshness of the water in the membrane filter element 10.

[0158] Of course, a cleaning switch can also be set on the controller, and the user inputs a cleaning instruction through the cleaning switch. After receiving the cleaning instruction, the controller triggers the control circuit of the water inlet valve 15, the boosting pump 20, the second water inlet valve 107, the mixing valve 30 and the pure water reflux valve 104 to control the water inlet valve 15, the boosting pump 20, the mixing valve 30, the second water inlet valve 107 and the pure water reflux valve 104 to operate and flush the membrane filter element 10.

[0159] In order to facilitate confirmation of whether the water purification system 100 has finished water production, that is, to facilitate confirmation of whether the water intake device 25 of the water purification system 100 is closed, in one embodiment of the present invention, the water purification system 100 also includes a pressure detection device 96, which can be a pressure sensor, a pressure switch or other device capable of detecting water pressure. The pressure detection device 96 is installed on the pure water pipe b, and is used to detect the water pressure in the pure water pipe b. Specifically, when the water intake device 25 is closed, the membrane filter element 10 will not stop making water immediately, but the pure water produced by the membrane filter element 10 will be discharged into the pure water pipe b. At this time, the water pressure in the pure water pipe b will increase. When the controller receives the signal from the pressure detection device 96 that the water pressure in the pure water pipe b is higher than the preset first water pressure value, the controller will trigger the operation of the water inlet valve 15, the booster pump 20, the mixing valve 30 and the pure water reflux valve 104 to flush the membrane filter element 10; when the water intake device 25 is opened, when the controller receives the signal from the pressure detection device 96 that the water pressure in the pure water pipe b is lower than the second preset water pressure value, the controller will trigger the operation of the water inlet valve 15, the mixing valve 30, the booster pump 20 and the pure water reflux valve 104 to start making water.

[0160] In order to improve the detection accuracy of the pressure detection device 96, the water purification system 100 is further provided with a fourth one-way valve 97, which is installed on the pure water pipe b between the membrane filter element 10 and the water intake device 25. Such a configuration ensures that the pure water in the pure water pipe b on the water outlet side of the fourth one-way valve 97 will not flow back into the membrane filter element 10, thereby ensuring the accuracy of the water pressure in the pure water pipe b detected by the third pressure detection device 96.

[0161] In order to facilitate confirmation of whether the water purification system 100 has finished water production, that is, to facilitate confirmation of whether the water intake device 25 of the water purification system 100 is closed, in one embodiment of the present invention, the water purification system 100 also includes a third flow detection device 109, and the second flow detection device 109 is installed on the pure water pipe b, which is used to detect whether there is water flowing in the pure water pipe b. Specifically, when the water intake device 25 is closed, the water in the pure water pipe b stops flowing. When the controller receives a signal from the third flow detection device 109 that the water in the pure water pipe b stops flowing or the flow rate is lower than the first preset flow rate, the controller will trigger the water inlet valve 15, the boost pump 20, the mixing valve 30, and the pure water reflux valve 104 to flush the membrane filter element 10; when the water intake device 25 is opened, the controller receives a signal from the third flow detection device 109 that the water in the pure water pipe b starts to flow or the flow rate is higher than the preset second preset flow rate, the controller will trigger the water inlet valve 15, the mixing valve 30, the boost pump 20 and the pure water reflux valve 104 to start water production.

[0162] In order to facilitate confirmation of whether the water intake device is turned on, the water intake device can use an intelligent water intake device. When the water intake device is turned on / off, the signal is directly transmitted to the controller, and the controller triggers the water inlet valve 15, the mixing valve 30, the booster pump 20 and the pure water return valve 104 to start water production / flushing.

[0163] In order to extend the service life of the membrane filter element 10, in one embodiment of the present invention, the water purification system 100 also includes a pre-filter element 98, and the pre-filter element 98 is installed on the raw water pipe a. It should be noted that the number of the pre-filter element 98 can be one, multiple or a composite filter element, and the pre-filter element 98 can be a P cotton filter element, an activated carbon filter element or other filter element with filtering function, which is not specifically limited here. The pre-filter element 98 is arranged in front of the membrane filter element 10, so that large particles of impurities in the raw water can be effectively filtered out, thereby avoiding the particle impurities in the raw water adhering to the membrane filter element 10, which causes the membrane filter element 10 to be blocked, thereby shortening the service life of the membrane filter element 10.

[0164] Preferably, the pre-filter element 98 is a composite filter element, which is composed of three layers of non-woven fabric, carbon fiber and P-cotton. That is, the composite filter element combines the functions of the carbon fiber filter element and the P-cotton filter element, that is, one filter element can replace two filter elements, thereby reducing the number of pre-filter elements 98 and making the installation space required for the entire water purification system 100 smaller.

[0165] In order to improve the water quality and taste of pure water, in one embodiment of the present invention, please refer to Figure 1 , Figure 6~Figure 11 , the water purification system 100 also includes a post-filter element 99, which is connected in series to the pure water pipe b. It should be noted that the number of the pre-filter element 98 can be one, multiple or a composite filter element. The post-filter element 99 can be an activated carbon filter element or an ultrafiltration filter element. The activated carbon filter element mainly uses activated carbon as the main raw material, which can remove residual chlorine, odor, etc. in the water, and at the same time improve the taste of the water, which is beneficial to enhance the user experience. The ultrafiltration filter element can further remove pollutants such as colloids, rust, suspended matter, silt and macromolecular organic matter in the water.

[0166] It should be said that in each embodiment of the present invention, the control circuits of the water inlet valve 15, the booster pump 20, the pure water reflux valve 104, the mixing valve 30, the second water inlet valve 107 and other components in the water purification system 100 are all existing circuits, and the control circuits of the components in the water purification system 100 will not be described in detail here.

[0167] In order to save water resources, the water purification system of this patent can also be equipped with a wastewater reflux system to reflux part of the wastewater. After pure water flushing, the RO is filled with low TDS water. When the water is produced next time, part of this low TDS water is purified into pure water, and the other part becomes wastewater and flows out of the wastewater outlet. Therefore, after pure water flushing, the TDS of the earliest wastewater discharged when the water is produced again is very low, even far lower than the TDS of the raw water, so this part of the wastewater can be recycled. As the water production time is delayed, the TDS of the wastewater will gradually increase, and eventually it will not be suitable for further recycling.

[0168] When water is produced again after pure water flushing, the controller triggers the second water inlet valve to close or the three-way valve 107 to connect the wastewater return outlet, and wastewater is reused at the beginning of water production. When the recycling time reaches the preset third time, the controller triggers the second water inlet valve to open or the three-way valve 107 to connect the wastewater pipe outlet to stop wastewater recycling.

[0169] In order to more accurately control the wastewater reuse process, a fourth flow detection device 112 or a third TDS sensor can be set on the wastewater pipeline c. When the fourth flow detection device 112 detects that the wastewater flow rate discharged when water is produced again reaches a preset third volume, or when the third TDS sensor 113 detects that the wastewater TDS is higher than the preset fourth TDS value, the controller will trigger the second water inlet valve to open or the three-way valve 107 to connect the wastewater pipe outlet to stop recycling wastewater.

[0170] Embodiment three, as Figure 8In order to further improve the flushing results and simplify the interface of the water storage device, the pure water return branch d and the mixed water flushing branch e can be optimized to be connected to the same water outlet of the water storage device. The pure water return branch d and the mixed water flushing branch e intersect at point T. At this time, the water storage device has two interconnected water outlets. The corresponding flushing method will change, and the setting position of the flow detection device / TDS detection device will also be fine-tuned. See the structural diagram of the specific implementation method. Figure 8 As shown, in this embodiment, the water storage device has two water outlets, the water storage device is installed on the f pipe, and the T point is connected to one of the water outlets of the water storage device.

[0171] When the user needs to draw water, the water intake device 25 is opened. When the controller receives the signal that the water intake device 25 is opened, the control circuit of the water inlet valve 15, the mixing valve 30, the booster pump 20 and the pure water reflux valve 104 is triggered to control the opening of the water inlet valve 15 and the booster pump 20, and the opening or closing of the mixing valve 30, so that the raw water enters the membrane filter element 10 through the raw water pipe a and is filtered. The pure water produced by the membrane filter element 10 is discharged through the pure water pipe b for the user to take, and the waste water generated by the membrane filter element 10 in producing pure water is discharged through the waste water pipe c.

[0172] When the user finishes taking water, the water intake device 25 will be closed. When the controller receives the signal that the water intake device 25 is closed, the first stage of flushing is performed: the controller triggers the control circuit of the water inlet valve 15, the booster pump 20, the second water inlet valve 107 and the pure water reflux valve 104 to control the water inlet valve 15 and the booster pump 20 to continue to remain in the open state, and at the same time controls the pure water reflux valve 104 to remain in the open state, and the mixing valve is closed. At this time, the pure water produced by the membrane filter element 10 flows into the water storage chamber of the water storage device 35 through the pure water reflux pipe d, and squeezes out the original water in the water storage chamber, and the squeezed water is merged into the raw water pipe through the raw water branch f.

[0173] When a certain amount of pure water is loaded into the water storage device, the second stage of flushing begins: the controller triggers the control circuits of the water inlet valve 15, the booster pump 20, the second water inlet valve 107, and the pure water reflux valve 104 to control the water inlet valve 15 to close, the booster pump 20 to continue to remain in an open state, and the pure water reflux valve 104 to remain in an open state, and the water mixing valve 30 to open, so that the raw water flows into the water storage device through the raw water branch f, squeezes out the pure water stored in the water storage device in the previous stage, and the pure water produced by the membrane filter element flows back through the pure water reflux branch d. The pure water squeezed out of the water storage device and the pure water produced by the membrane filter element meet at point T and mix, and flow into the membrane filter element together for flushing. Part of the water is purified into pure water again, and flows back to the water storage device through the pure water reflux path d again, and the other part of the water carries the TDS in the membrane filter element and is discharged from the waste water end.

[0174] Alternatively, when a certain amount of pure water is loaded into the water storage device, the controller triggers the control circuits of the water inlet valve 15, the booster pump 20, the second water inlet valve 107 and the pure water reflux valve 104 to control the closing of the water inlet valve 15, the booster pump 20, the pure water reflux valve 104, and the opening of the mixing valve 30, so that the raw water flows into the water storage device through the raw water branch f, squeezes the pure water stored in the water storage device in the previous stage into the membrane filter element, rinses the membrane filter element, and discharges the high-concentration raw water and concentrated water in the membrane filter element from the wastewater end.

[0175] Such a configuration ensures that when the water purification system is in standby mode, no ion penetration problem occurs in the membrane filter element, thereby ensuring that the water quality of the first cup of pure water obtained when the water purification system is started next time can meet the needs of users; and extends the service life of the membrane filter element; and reduces the scaling risk of the wastewater valve.

[0176] Embodiment 4, as Fig. 9 In order to further improve the flushing results and simplify the interface of the water storage device, the pure water return branch d and the raw water branch f can be optimized to be connected to the same water outlet of the water storage device. The pure water return branch d and the raw water branch f intersect at point T. At this time, the water storage device has two interconnected water outlets. Correspondingly, the flushing method will change, and the setting position of the flow detection device / TDS detection device will also be fine-tuned. See the structural diagram of the specific implementation method. Fig. 9 In this embodiment, the water storage device takes two water outlets as an example, and the pure water return branch d and the raw water branch f intersect at point T.

[0177] When the user needs to draw water, the water intake device 25 is opened. When the controller receives the signal that the water intake device 25 is opened, the control circuit of the water inlet valve 15, the water mixing valve 30 and the boosting pump 20 is triggered to control the opening of the water inlet valve 15 and the boosting pump 20, and the opening or closing of the water mixing valve 30, so that the raw water enters the membrane filter element 10 through the raw water pipe a and is filtered. The pure water produced by the membrane filter element 10 is discharged through the pure water pipe b for the user to take, and the waste water generated by the membrane filter element 10 in producing pure water is discharged through the waste water pipe c.

[0178] When the user finishes taking water, the water intake device 25 will be closed. When the controller receives the signal that the water intake device 25 is closed, the first stage of flushing is performed: the controller triggers the control circuit of the water inlet valve 15, the booster pump 20, the second water inlet valve 107 and the pure water reflux valve 104 to control the water inlet valve 15, the booster pump 20, the pure water reflux valve 104 and the mixing valve to remain open. At this time, the pure water produced by the membrane filter element 10 flows into the water storage chamber of the water storage device 35 through the pure water reflux pipe d, and squeezes out the original water in the water storage chamber. The squeezed water is then merged into the raw water pipe through the mixing water branch e.

[0179] When a certain amount of pure water is loaded into the water storage device, the second stage of flushing begins: the controller triggers the control circuits of the water inlet valve 15, the booster pump 20, the second water inlet valve 107, and the pure water reflux valve 104 to control the water inlet valve 15 to close, the booster pump 20 to continue to remain open, and the pure water reflux valve 104 to remain open, and the water mixing valve 30 to open, so that the raw water flows through the raw water branch f, and the pure water produced by the membrane filter element flows back through the pure water reflux branch d, the raw water and the pure water meet at point T and mix, the mixed water flows into the water storage device, squeezes out the pure water stored in the water storage device in the previous stage, and flows into the membrane filter element for flushing. Part of the water is purified into pure water again, and flows back to the water storage device through the pure water reflux path d again, and the other part of the water carries the TDS in the membrane filter element and is discharged from the wastewater end.

[0180] Alternatively, when a certain amount of pure water is loaded into the water storage device, the controller triggers the control circuits of the water inlet valve 15, the booster pump 20, the second water inlet valve 107 and the pure water reflux valve 104 to control the closing of the water inlet valve 15, the booster pump 20, the pure water reflux valve 104, and the opening of the mixing valve 30, so that the raw water flows into the water storage device through the raw water branch f, squeezes the pure water stored in the water storage device in the previous stage into the membrane filter element, rinses the membrane filter element, and discharges the high-concentration raw water and concentrated water in the membrane filter element from the wastewater end.

[0181] Such a configuration ensures that when the water purification system is in standby mode, no ion penetration problem occurs in the membrane filter element, thereby ensuring that the water quality of the first cup of pure water obtained when the water purification system is started next time can meet the needs of users; and extends the service life of the membrane filter element; and reduces the scaling risk of the wastewater valve.

[0182] Embodiment 5, as Figure 1 For example, when the system is producing water normally, when the raw water pressure is very low (less than 0.15MPa), pure water will flow back through the pure water return branch, causing the pure water flow rate of the water purification system to be significantly reduced.

[0183] In order to limit the pure water from flowing directly or through the water storage device into the raw water branch, a second one-way valve 55 can also be set on the raw water branch to replace Figure 6 The pure water reflux valve 104 of the example. Correspondingly, the flushing method will change, and the setting position of the flow detection device / TDS detection device will also be fine-tuned. Fig.10 and 11 shown.

[0184] Fig.10 Example 6 is similar to Example 6, because the second one-way valve restricts the water in the water storage tank from flowing out through the raw water branch f. Fig.10 Example The first stage flush has only one mode.

[0185] When the user finishes taking water, the water intake device 25 will be closed. When the controller receives the signal that the water intake device 25 is closed, the first stage of flushing is performed: the controller triggers the control circuit of the water inlet valve 15, the booster pump 20, the second water inlet valve 107 and the mixing valve 30 to control the water inlet valve 15, the booster pump 20 and the mixing valve 30 to remain open. At this time, the pure water produced by the membrane filter element 10 flows into the water storage chamber of the water storage device 35 through the pure water return pipe d, and squeezes out the original water in the water storage chamber. The squeezed water is merged into the raw water pipe through the mixing water branch e.

[0186] The second stage flushing method Figure 6 The examples are the same and will not be described in detail here.

[0187] Fig.11 Example flushing method and Fig. 9 The examples are the same and will not be described in detail here.

[0188] The present invention further provides a water purification device, which includes: a housing; and the water purification system in the above embodiment, wherein the water purification system is installed in the housing. Since the water purification device includes the water purification system, the water purification device has all the beneficial effects of the water purification system.

[0189] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. All equivalent structural changes made using the contents of the present specification and drawings under the inventive concept of the present invention, or direct / indirect applications in other related technical fields, are included in the patent protection scope of the present invention.

Claims

1. A water purification system, characterized in that: The water purification system comprises: The membrane filter element has a raw water inlet connected to the raw water pipe, a pure water inlet connected to the pure water pipe, and a waste water inlet connected to the waste water pipe; A water inlet valve, installed on the raw water pipe; A pressure boosting device, installed on the raw water pipe between the water inlet valve and the membrane filter element; A water intake device, installed on the pure water pipe; A water storage device, comprising a water storage chamber and a plurality of water outlets interconnected with each other, for storing one of raw water, pure water and mixed water formed by mixing raw water and pure water; A raw water branch, one end of which is connected to the raw water pipe between the raw water inlet and the water inlet valve at a first connection point P, and the other end is connected to the water outlet of the water storage device, so that the raw water flows into the water storage chamber through the raw water branch; A pure water reflux branch, one end of which is connected to the pure water pipe between the pure water port of the membrane filter element and the water intake device at the second connection point R, and the other end is connected to the water outlet of the water storage device, so that the pure water produced by the membrane filter element flows into the water storage chamber through the pure water reflux branch; A flushing branch, one end of which is connected to the water outlet of the water storage device, and the other end of which is connected to the raw water pipe between the water inlet valve and the booster device at a third connection point Q, so that the water stored in the water storage device flows into the membrane filter element through the flushing branch to flush the membrane filter element; A water mixing valve, the water mixing valve is arranged on the flushing branch; A first one-way valve, which is arranged on the pure water return branch to limit the flow of raw water to the pure water pipe through the pure water return branch; And, a wastewater valve or a wastewater hole, wherein the wastewater valve is installed on the wastewater pipe or the wastewater hole is opened at the wastewater end of the membrane filter element to control the wastewater flow; The water purification system further comprises a pure water reflux valve, which is arranged on the pure water reflux pipe to control the pure water produced by the membrane filter element to reflux through the pure water reflux branch during normal water production; The water purification system further includes a controller, which is electrically connected to the water inlet valve, the water mixing valve, the pressure boosting device, the water intake device and the pure water return valve, respectively. When the controller receives a water production signal and a flushing signal, it controls the water inlet valve, the water mixing valve, the pressure boosting device and the pure water return valve to open / close respectively; The flushing signal includes a flushing first stage signal and a flushing second stage signal. When the controller receives the flushing first stage signal, it controls the water inlet valve to open, the water mixing valve to open or close, the booster device to open, and the pure water reflux valve to open, so that the pure water produced by the membrane filter element flows into the water storage device through the pure water reflux branch; When the controller receives the flushing second stage signal, it controls the water inlet valve to close, the water mixing valve to open, the booster device to open or close, and the pure water return valve to open or close, so that the water stored in the water storage device in the first stage of flushing flows into the membrane filter element through the flushing branch to flush the membrane filter element; The water purification system includes a wastewater recovery system, which includes a second water inlet valve, a wastewater return pipe, and a third one-way valve; a second water inlet valve, the second water inlet valve being located on the wastewater pipeline after the wastewater valve; A wastewater return pipe, wherein the water inlet end of the wastewater return pipe is connected to the wastewater pipe between the wastewater valve and the second water inlet valve, and the water outlet end of the wastewater return pipe is connected to the raw water pipe or the raw water branch or the mixed water branch between the water storage device and the mixing water valve or the pure water return branch between the water storage device and the first one-way valve at a fourth connection point N to recycle wastewater; Alternatively, the wastewater recovery system includes a one-inlet and two-outlet valve, a wastewater return pipe, and a third one-way valve; A one-inlet and two-outlet valve, wherein the water inlet is located on the wastewater pipeline after the wastewater valve, one of the water outlets is connected to the wastewater return pipe for recycling wastewater, and the other water outlet is used to directly discharge wastewater; A wastewater return pipe, wherein the water inlet end of the wastewater return pipe is connected to a water outlet of an inlet-two-outlet valve, and the water outlet end is connected to the raw water pipe or the raw water branch or the mixing water branch between the water storage device and the mixing water valve or the pure water return branch between the water storage device and the first one-way valve at the fourth connection point N to recycle the wastewater.

2. The water purification system according to claim 1, characterized in that: The water purification system also includes a second one-way valve, which is arranged on the raw water branch to limit the pure water produced by the membrane filter element from flowing back into the raw water pipe through the raw water branch during normal water production.

3. The water purification system according to claim 1, characterized in that: The water storage device is provided with a guide pipe, a guide baffle, or an isolating member to separate the water storage chamber into two interconnected parts to control the degree of mixing of raw water and pure water with the water in the original water storage device when the raw water and pure water are filled into the water storage device.

4. The water purification system according to claim 1, characterized in that: The water purification system further comprises a pressure reducing valve, which is installed on the raw water pipe before the third connection point P.

5. The water purification system according to claim 1, characterized in that: The third one-way valve is unidirectionally conductive from the wastewater outlet of the membrane filter element to the fourth connection point N.

6. The water purification system according to claim 1, characterized in that: The water purification system further comprises a timing device, which is used to detect the water production duration, water production stop duration, and the duration of the first-stage flushing and the second-stage flushing of the water purification system; The controller of the water purification system is also electrically connected to the timing device. The controller of the water purification system controls the water inlet valve, the water mixing valve, the booster device, the pure water return valve of the water purification system, and the second water inlet valve to operate according to the detection result of the timing device, so as to perform the first / second stage flushing on the membrane filter element; The controller of the water purification system flushes the membrane filter element once at regular intervals according to the timing result of the timing device; The controller of the water purification system controls the operation of the second water inlet valve or the one-inlet-two-outlet valve according to the timing result of the timing device to recover the waste water.

7. The water purification system according to claim 1, characterized in that: The water purification system further comprises a first flow detection device, which is installed on the pure water return branch; The controller of the water purification system is also electrically connected to the first flow detection device. The controller of the water purification system controls the water inlet valve, the boosting device, the mixing valve and the pure water return valve of the water purification system according to the detection result of the first flow detection device, ends the first stage flushing, and switches to the second stage flushing.

8. The water purification system according to claim 1, characterized in that: The water purification system further comprises a second flow detection device, which is installed on a raw water branch or a waste water pipeline; The controller of the water purification system is also electrically connected to the second flow detection device. The controller of the water purification system controls the water inlet valve, the boosting device, the mixing valve and the pure water return valve of the water purification system according to the detection result of the second flow detection device, thereby ending the second stage of flushing.

9. The water purification system according to claim 1, characterized in that: The water purification system also includes a first TDS sensor device, which is installed on a raw water branch or a mixed water branch; the controller of the water purification system is also electrically connected to the TDS sensor device, and the controller of the water purification system controls the operation of the water inlet valve, the boosting device, the mixing valve and the pure water return valve of the water purification system according to the detection result of the first TDS sensor device to end the first stage flushing and switch to the second stage flushing.

10. The water purification system according to claim 1, characterized in that: The water purification system also includes a second TDS sensor device, which is installed on a mixing water branch or a wastewater pipe; the controller of the water purification system is also electrically connected to the TDS sensor device, and the controller of the water purification system controls the operation of the water inlet valve, the boosting device, the mixing water valve and the pure water return valve of the water purification system according to the detection result of the second TDS sensor device to end the second stage of flushing.

11. The water purification system according to claim 1, characterized in that: The water purification system further comprises a third TDS sensor device, which is installed on the wastewater pipeline; the controller of the water purification system is also electrically connected to the TDS sensor device, and the controller of the water purification system controls the operation of the water inlet valve, the booster device, the mixing valve and the pure water return valve of the water purification system according to the detection result of the third TDS sensor device to end the second stage of flushing; The controller of the water purification system controls the operation of the second water inlet valve or the one-inlet-two-outlet valve according to the detection result of the third TDS sensor device to recycle waste water.

12. The water purification system according to claim 1, characterized in that: The water purification system further comprises a pressure detection device, which is installed on the pure water pipeline; The controller of the water purification system is also electrically connected to the pressure detection device. When the controller of the water purification system receives the signal detected by the pressure detection device, it triggers the system to enter the normal water production or flushing program, and controls the operation of the water inlet valve, the boosting device, the second water inlet valve of the water purification system, the mixing valve and the pure water return valve of the water purification system to perform water production / flushing.

13. The water purification system according to claim 1, characterized in that: The water purification system further comprises a third flow sensor, and the third flow sensor is installed on the pure water pipe; The controller of the water purification system is also electrically connected to the third flow sensor. When the controller of the water purification system receives the signal detected by the third flow sensor, it triggers the system to enter a normal water production or cleaning procedure, and controls the operation of the water inlet valve, the boosting device, the second water inlet valve, the mixing valve and the pure water return valve of the water purification system to produce water / flushing.

14. The water purification system according to claim 1, characterized in that: The water storage device, the water mixing valve and the first one-way valve are connected to form a water storage assembly, and the water storage assembly can be independently disassembled and installed in a water purification system.

15. A water purification device, characterized in that: include: shell; The water purification system according to any one of claims 1 to 14, wherein the water purification system is installed in a housing.

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