Water purification system and sterilization control method in water purification system

Abstract

The application discloses a water purification system and a sterilization control method for the water purification system, and belongs to the technical field of water purifiers. The water purification system is designed to solve the problem that the prior art cannot sterilize and disinfect the pipeline inside the water purification system. The water purification system comprises a filter core assembly, a water inlet channel, a pure water channel, a sterilization loop, and a cross water channel. The sterilization loop comprises a sterilization assembly. The water inlet end of the sterilization assembly is connected to the pure water channel, and the water outlet end of the sterilization assembly is connected to the water inlet channel. One end of the cross water channel is connected to the water inlet channel, and the other end of the cross water channel is connected to the pure water channel. Liquid in the water inlet channel can selectively flow into the filter core or the cross water channel. The water purification system and the sterilization control method for the water purification system can make the disinfectant liquid in the sterilization loop flow into the water inlet channel and reach all the pipelines in the water purification system along with the water flow in the water inlet channel, thereby achieving disinfection and sterilization of the whole pipeline. The cross water channel can prevent the functional layer of the filter core from being oxidized by the high-concentration disinfectant liquid.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of water purifiers, in particular to a water purification system and a sterilization control method for the water purification system. BACKGROUND

[0002] A water purifier mainly comprises a filter core, and raw water (tap water, surface water and other water not suitable for direct use) is purified to obtain pure water suitable for direct use after passing through the filter core. The filter core is usually filled with PP cotton, activated carbon and filter membrane and the like, and the water is purified by filtration. When the water purifier is not used for a long time, there is no continuous water flow to flush the pipeline and the filter core. The water environment and filter material in the filter core are prone to breed various bacteria, viruses and microorganisms, resulting in an excessive number of colonies in the pure water; the metabolic products of bacteria, viruses and microorganisms produce a foul odor, resulting in poor taste of the pure water; bacteria, viruses and microorganisms are prone to breed and adsorb on the surface of the filter membrane of the filter core, which reduces the service life of the filter membrane.

[0003] In order to solve the above problems, a water purifier in the prior art is provided with an ultraviolet sterilization lamp at the water outlet end to kill bacteria, viruses and microorganisms in the outlet water by irradiation of ultraviolet rays. The defects of this device include: the corpses of the killed bacteria, viruses and microorganisms remain in the outlet water, resulting in poor water quality for the user; the ultraviolet sterilization lamp can only kill bacteria, viruses and microorganisms in the outlet water, and cannot kill bacteria, viruses and microorganisms in the pipeline and filter core upstream of the sterilization lamp, so the filter core may still produce odor and the filter membrane still has the risk of biological contamination.

[0004] There is also a water purifier in the prior art which adds sodium hypochlorite tablets for slow-release disinfection at the rear end of the pure water. The defects of this device include: during the disinfection process, the pure water faucet needs to be opened to drain the disinfectant, which is complicated to operate; the front end of the water purifier including the filter core is not disinfected, so the filter core may still produce odor and the filter membrane still has the risk of biological contamination. SUMMARY

[0005] The present application aims to provide a water purification system and a sterilization control method for the water purification system, which solves the problem that the prior art cannot sterilize and disinfect the pipeline inside the water purification system, and the drinking water is safer and more delicious.

[0006] To achieve this goal, on the one hand, the present application adopts the following technical solutions:

[0007] The water purification system comprises: a filter core assembly comprising a filter core; a water inlet channel connected to a water inlet end of the filter core; a purified water channel connected to a water outlet end of the filter core assembly; a sterilization loop comprising a sterilization assembly, a water inlet end of the sterilization assembly being connected to the purified water channel, and a water outlet end of the sterilization assembly being connected to the water inlet channel; and a cross-connection channel having one end connected to the water inlet channel and the other end connected to the purified water channel, the cross-connection channel comprising a second water inlet on-off valve arranged on a water pipe, and liquid in the water inlet channel being selectively flowed into the filter core or the cross-connection channel.

[0008] In one preferred embodiment, the sterilization assembly comprises a disinfection module, a flow control pump, and a third water inlet on-off valve, and the disinfection module and the flow control pump are connected in series and connected in parallel to the third water inlet on-off valve.

[0009] In one preferred embodiment, the disinfection module is a container containing sodium hypochlorite solution, a container containing chlorine dioxide tablets, and / or a container containing plant sterilization extract.

[0010] In one preferred embodiment, the water inlet channel comprises a pre-combined filter core and a pressure reducing valve arranged in sequence along the water flow direction, the water outlet end of the sterilization assembly is connected to the water inlet channel between the pre-combined filter core and the pressure reducing valve through a high-pressure check valve, and connected to the water inlet channel upstream of the pre-combined filter core through a fourth water inlet on-off valve and a second check valve.

[0011] In one preferred embodiment, the water inlet channel further comprises a booster pump and a first water inlet on-off valve arranged in sequence along the water flow direction, the first water inlet on-off valve is connected to the water inlet end of the filter core, and one end of the cross-connection channel is connected to the water inlet channel between the booster pump and the first water inlet on-off valve.

[0012] In one preferred embodiment, the filter core assembly further comprises a rear carbon filter core connected to the water outlet end of the filter core.

[0013] In one preferred embodiment, the purified water channel comprises a detection meter, and the water inlet end of the sterilization assembly is connected to the purified water channel downstream of the detection meter.

[0014] In one preferred embodiment, the detection meter is a residual chlorine detection meter, a TDS probe, and / or a flow meter.

[0015] In another aspect, the present application adopts the following technical solutions:

[0016] The sterilization control method for the water purification system comprises a high-concentration sterilization mode and a low-concentration sterilization mode. In the high-concentration sterilization mode, the disinfecting liquid flows through the water path except the filter element assembly. In the low-concentration sterilization mode, the disinfecting liquid flows through the water path including the filter element assembly. The concentration of the disinfecting substance in the disinfecting liquid in the high-concentration sterilization mode is higher than that in the low-concentration sterilization mode.

[0017] In one preferred embodiment, the condition for starting the sterilization control method is that:

[0018] The user needs sterilization and directly starts the sterilization program; or,

[0019] It is determined whether the water purification system is used for the first time. If yes, the sterilization program is directly started. Otherwise, the interval working time t is recorded. It is determined whether the interval working time t is greater than or equal to the continuous non-working disinfection sterilization time T. If yes, the sterilization program is started.

[0020] In one preferred embodiment, the sterilization program comprises the high-concentration sterilization mode, the reduced high-concentration sterilization mode, the low-concentration sterilization mode, and the pure water backwashing mode in sequence.

[0021] In one preferred embodiment, the high-concentration sterilization mode is that the sterilization assembly puts the disinfecting substance into the sterilization loop to form the disinfecting liquid. The disinfecting substance reaches the first concentration. The disinfecting liquid flows through at least part of the water inlet path, the cross-linking water path, at least part of the pure water path, and the sterilization loop to achieve the circulating sterilization. The circulating sterilization time is at least T1.

[0022] The reduced high-concentration sterilization mode is that the water inlet path comprises a pre-composite filter element. The pre-composite filter element is provided with activated carbon. The sterilization assembly stops putting the disinfecting substance into the sterilization loop. The disinfecting liquid in the sterilization loop enters the pre-composite filter element after passing through the sterilization assembly. The disinfecting substance concentration of the disinfecting liquid flowing out of the pre-composite filter element is reduced.

[0023] The low-concentration sterilization mode is that the sterilization assembly puts the disinfecting substance into the sterilization loop to form the disinfecting liquid. The disinfecting substance reaches the second concentration. The second concentration is lower than the first concentration. The disinfecting liquid enters the filter element assembly after flowing through part of the water inlet path including the pre-composite filter element. The obtained pure water flows through part of the pure water path and then returns to the sterilization loop. The concentrated water carrying the disinfecting substance flows out through the concentrated water path. The disinfecting liquid is circulated for at least the sterilization time T2.

[0024] The pure water backwashing mode is that raw water enters the filter core assembly through the water inlet channel, and the obtained pure water enters the pre-composite filter core after passing through the sterilization assembly, so as to realize the circulating flow of the pure water, and the circulating flow time is at least T3.

[0025] The water purification system disclosed by the application comprises a sterilization loop and a cross water channel, liquid in the water inlet channel can be selectively flowed into the filter core or the cross water channel, disinfecting liquid formed in the sterilization loop can enter the water inlet channel and reach the pipelines in the water purification system along the water flow in the water inlet channel, so as to disinfect and sterilize the whole pipeline and inhibit the breeding of bacteria, viruses and microorganisms in the pipeline; especially when the water purification system is not used for a long time, the whole pipeline can be fully disinfected and sterilized to ensure the water quality safety of drinking water. The cross water channel is connected at both ends of the filter core assembly, when the disinfecting liquid concentration is high, the water pipe of the cross water channel is smooth, so as to avoid that the functional layer of the filter core is oxidized by the high-concentration disinfecting liquid and the purification effect is reduced due to the oxidation of the functional layer.

[0026] The sterilization control method in the water purification system disclosed by the application comprises a high-concentration sterilization mode and a low-concentration sterilization mode, disinfecting liquid does not enter the filter core when the high-concentration sterilization mode is executed, so as to avoid damaging the functional layer of the filter core; disinfecting liquid enters the filter core to disinfect and sterilize when the low-concentration sterilization mode is executed, so as to improve the sanitary standard in the water purification system and make the drinking water safer and more delicious. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 Fig. 1 is a structural schematic diagram of the water purification system provided by the embodiment of the application;

[0028] Figure 2 Fig. 6 is a flow chart of the sterilization control method in the water purification system provided by the embodiment of the application.

[0029] Figure 3 Fig. 7 is a working principle diagram of the water purification system executing the high-concentration sterilization mode provided by the embodiment of the application;

[0030] Figure 4 Fig. 8 is a working principle diagram of the water purification system executing the low-concentration sterilization mode provided by the embodiment of the application;

[0031] Figure 5 Fig. 9 is a working principle diagram of the water purification system executing the pure water backwashing mode provided by the embodiment of the application.

[0032] Figure 6 Fig. 9 is a working principle diagram of the water purification system executing the pure water backwashing mode provided by the embodiment of the application. DETAILED DESCRIPTION

[0033] In order to make the above objectives, features and advantages of the present application more clear and comprehensible, the specific embodiments of the present application will be described below in detail with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. However, the present application can be practiced in many different manners without the specific details, and it is to be understood that the present application is not limited to the specific embodiments described below and that the specific embodiments are given for the purposes of exemplification only.

[0034] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0035] In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined with "first", "second", etc. can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise explicitly specified and limited.

[0036] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connecting", "fixing" and the like should be understood in a broad sense, for example, it can be fixed connection, or detachable connection, or integral; it can be mechanical connection, or electrical connection; it can be direct connection, or indirect connection through intermediate medium, or internal communication of two elements or interaction relationship between two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0037] In the present application, unless otherwise explicitly specified and limited, the first feature "on" or "under" the second feature can be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature "above", "over" and "on" the second feature can be that the first feature is directly above or obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "under" and "under" the second feature can be that the first feature is directly below or obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0038] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0039] This embodiment discloses a water purification system and an internal sterilization control method based on the water purification system, such as... Figure 1 As shown, the water purification system mainly includes a filter assembly, an inlet water path, a pure water path, a sterilization circuit, a bridging water path, and a concentrate water path. The filter assembly includes a filter element, a post-carbon filter element connected to the outlet of the filter element, and a first check valve connected to the outlet of the post-carbon filter element. The concentrate water path is connected to the outlet of the filter element, and the inlet water path is connected to the inlet of the filter element. The pure water path is connected to the outlet of the filter assembly; specifically, it is connected to the outlet of the first check valve. The filter element can be, but is not limited to, an RO membrane filter element (or reverse osmosis membrane filter element), such as a nanofiltration membrane or an ultrafiltration membrane.

[0040] The concentrate circuit includes a concentrate combination valve installed on the pipeline. This concentrate combination valve includes at least a concentrate on / off valve to control the flow and blockage of the pipeline. In addition, the concentrate combination valve may also include a flow restrictor valve, which can be connected in parallel or series with the concentrate on / off valve. When the flow restrictor valve and the concentrate on / off valve are connected in parallel, when the concentrate on / off valve is open, all the water in the concentrate pipe flows smoothly out through the pipeline containing the concentrate on / off valve; when the concentrate on / off valve is closed, the water in the concentrate pipe flows slowly out through the pipeline containing the flow restrictor valve. This prevents the small amount of concentrate produced by the filter cartridge from accumulating in the concentrate pipe, and also prevents the concentrate pipe from being completely emptied, which could lead to the growth and spread of external bacteria along the concentrate pipe towards the filter cartridge.

[0041] One end of the bridging water circuit is connected to the inlet water circuit, and the other end is connected to the pure water circuit. That is, the bridging water circuit and the filter element assembly are connected in parallel. Liquid in the inlet water circuit can selectively flow into the filter element or into the bridging water circuit. The bridging water circuit includes a second inlet on / off valve installed on the water pipe. When the second inlet on / off valve is open, the water pipe of the bridging water circuit is unobstructed; when the second inlet on / off valve is closed, the water pipe of the bridging water circuit is shut off.

[0042] The sterilization loop comprises a sterilization assembly, the water inlet end of the sterilization assembly is connected to the pure water channel, and the water outlet end of the sterilization assembly is connected to the water inlet channel. The disinfectant liquid formed in the sterilization loop can enter the water inlet channel and flow along with the water flow in the water inlet channel to the pipes in the water purification system, thereby disinfecting and sterilizing the entire pipeline, inhibiting the growth of bacteria, viruses and microorganisms in the pipeline; especially when the water purification system is not used for a long time, the entire pipeline can be fully disinfected and sterilized to ensure the safety of the water quality for drinking water.

[0043] The cross-linking water channel is connected to the two ends of the filter core assembly, and when the disinfectant liquid has a high concentration, the water pipe of the cross-linking water channel is unblocked, thereby avoiding oxidation of the functional layer of the filter core by the high-concentration disinfectant liquid and avoiding a decrease in the purification effect caused by oxidation of the functional layer.

[0044] On the basis described above, the sterilization assembly comprises a disinfection module, a flow control pump and a third water inlet on-off valve, and the disinfection module and the flow control pump are connected in series and are connected in parallel to the third water inlet on-off valve. When the third water inlet on-off valve is opened, regardless of whether the flow control pump is started or not, the resistance of the pipeline in which the third water inlet on-off valve is located is smaller than the resistance of the pipeline in which the flow control pump is located, so the liquid in the sterilization loop flows through the pipeline in which the third water inlet on-off valve is located. When the third water inlet on-off valve is closed and the flow control pump is started, the liquid in the sterilization loop flows through the pipeline in which the disinfection module and the flow control pump are located, and disinfectant substances can be put into the sterilization loop. When the third water inlet on-off valve is closed and the flow control pump is stopped, the liquid in the sterilization loop cannot flow.

[0045] The specific structure of the disinfection module is not limited, as long as it can put disinfectant substances into the sterilization loop. In this embodiment, the disinfection module is a container containing sodium hypochlorite solution, a container containing chlorine dioxide tablets and / or a container containing plant sterilization extract. The container can be, but is not limited to, a liquid storage tank, which can be used to store the above-mentioned disinfectant substances and put the appropriate amount of disinfectant substances into the pipeline of the sterilization loop.

[0046] On the basis described above, the water inlet channel comprises, in sequence along the water flow direction, a pre-composite filter core, a pressure reducing valve, a pressure increasing pump and a first water inlet on-off valve, and the first water inlet on-off valve is connected to the water inlet end of the filter core. The water outlet end of the disinfection module is connected to the water inlet channel between the pre-composite filter core and the pressure reducing valve through a high-pressure check valve, and is connected to the water inlet channel upstream of the pre-composite filter core through a fourth water inlet on-off valve and a second check valve; one end of the cross-linking water channel is connected to the water inlet channel between the pressure increasing pump and the first water inlet on-off valve.

[0047] The specific structure of the pre-composite filter core is not limited, and any filter core with good chlorine residual removal effect or adsorption effect in the prior art can be used. In this embodiment, the pre-composite filter core can be, but is not limited to, a PP cotton + activated carbon filter core, a PAC composite filter core and a PCU composite filter core, and the pre-composite filter core is provided with activated carbon and has good chlorine residual removal effect.

[0048] The high-pressure one-way valve connected between the water outlet end of the disinfection module and the water inlet channel can play a low-pressure resistance role. That is, only when the pressure at the water outlet end of the disinfection module is sufficiently higher than the pressure in the water inlet channel, the high-pressure one-way valve can be opened, and the disinfectant liquid can flow from the disinfection module into the water inlet channel through the high-pressure one-way valve. In the present embodiment, when the fourth water inlet on-off valve is opened, the resistance of the pipeline where the high-pressure one-way valve is located is greater than the resistance of the pipelines where the fourth water inlet on-off valve and the second one-way valve are located, so the disinfectant liquid will flow from the disinfection module into the water inlet channel through the fourth water inlet on-off valve and the second one-way valve. Only when the fourth water inlet on-off valve is closed, the disinfectant liquid will be forced to flow from the disinfection module into the water inlet channel through the high-pressure one-way valve. In the present embodiment, the opening pressure of the high-pressure one-way valve is not less than 10 psi.

[0049] On the basis of the above, the pure water channel comprises a detection meter, and the water inlet end of the sterilization assembly is connected to the pure water channel downstream of the detection meter. The detection meter is a residual chlorine detection meter, a TDS probe and / or a flow meter.

[0050] The other structures in the water purification system are the same as those in the prior art, and will not be described here. In the present embodiment, the water purification system further comprises a control mechanism connected to the sterilization assembly and each water inlet on-off valve. The control mechanism can be a centralized or distributed controller. For example, the controller can be a single microcontroller or a plurality of microcontrollers distributed in different positions. The microcontroller can run a control program to control the sterilization assembly and each water inlet on-off valve to realize their functions.

[0051] The specific structures of the first water inlet on-off valve, the second water inlet on-off valve, the third water inlet on-off valve and the fourth water inlet on-off valve are not limited, as long as they can quickly and accurately control the opening and closing of the pipelines. In the present embodiment, all the water inlet on-off valves are solenoid valves, which are mature, stable, low in cost and easy to use.

[0052] The sterilization control method inside the water purification system comprises a high-concentration sterilization mode and a low-concentration sterilization mode. When the high-concentration sterilization mode is executed, the disinfectant liquid flows through the water channel excluding the filter element assembly, which can effectively kill bacteria, viruses and microorganisms in the whole water channel excluding the filter element assembly, has a high sterilization rate, and does not damage the functional layer of the filter element, thereby prolonging the service life of the filter element.

[0053] When the low-concentration sterilization mode is executed, the disinfectant liquid flows through the water channel including the filter element assembly, which can reduce bacteria, viruses and microorganisms in the reverse osmosis membrane filter element and the post carbon filter element, thereby further improving the water quality. The concentration of the disinfectant substance in the disinfectant liquid when the high-concentration sterilization mode is executed is higher than that when the low-concentration sterilization mode is executed. Therefore, the disinfectant liquid does not damage the functional layer of the filter element after entering the filter element, is safer to use, and does not affect the use performance of the filter element.

[0054] Figure 2 The flow chart of the sterilization control method of the water purification system is shown. After starting, but the user needs sterilization, directly start the sterilization program. When the user does not issue the "need sterilization" instruction, judge whether the water purification system is first installed and used. The first installation and use defaults to need to perform the disinfection and sterilization program first, so "yes, directly start the sterilization program, otherwise record the interval working time t".

[0055] The water purification system can be set at the factory or set by the user before use. The continuous non-working disinfection and sterilization time T is set, that is, when the continuous non-working time reaches T, the water purification system must be disinfected and sterilized to ensure the safety and deliciousness of drinking water. When not first installed and used, judge whether the interval working time t is greater than or equal to the continuous non-working disinfection and sterilization time T. Yes, start the sterilization program, otherwise return to the step of recording the interval working time t. It can be understood that during the execution of the sterilization program, the water purification system does not perform any other operations (including but not limited to producing pure water and cleaning the filter element, etc.).

[0056] The specific method of the user issuing the "need sterilization" instruction is not limited. A panel with human-computer interaction function can be set on the water purification system. The panel is provided with a sterilization button connected to the controller. The user can issue the "need sterilization" instruction to the controller by pressing the sterilization button. An APP can also be used on a terminal such as a mobile phone or computer to signal the controller. The user can select the APP to issue the "need sterilization" instruction to the controller. In addition, the APP can display the time interval from the last water use, making it easier for the user to monitor the interval working time t and making it more convenient to use.

[0057] The method for producing pure water by the water purification system is the same as the prior art. Specifically, the first water inlet on-off valve is opened, the second water inlet on-off valve and the third water inlet on-off valve are closed, and the flow control pump and the concentrated water combination valve are closed. The raw water passes through the water inlet channel to the front composite filter element, is pressurized by the booster pump, and is filtered by the filter element to produce pure water, which is discharged from the pure water channel; the concentrated water combination valve is opened, and the concentrated water generated by the filter element is discharged through the concentrated water channel.

[0058] The sterilization program includes, in sequence, a high-concentration sterilization mode based on a high-concentration sterilization system, a reduced high-concentration sterilization mode, a low-concentration sterilization mode based on a low-concentration sterilization system, and a pure water backwashing mode based on a full-pipeline purifying system. The purpose of the reduced high-concentration sterilization mode is to prevent the high-concentration disinfectant from damaging the filter core when the water path is switched. Specifically, the disinfectant in the sterilization loop is first allowed to flow into the pre-composite filter core, and the activated carbon in the pre-composite filter core reacts quickly and efficiently with the sodium hypochlorite to reduce the effective chlorine concentration in the water path. The purpose of the pure water backwashing mode is to prolong the service life of the filter core. Specifically, the pure water and raw water are mixed and circulated in the full pipeline, and the disinfectant in the full pipeline including the filter core is flushed with the pure water and raw water to prevent the membrane of the filter core from being oxidized.

[0059] As shown in Figure 1 and Figure 3 , when the high-concentration sterilization mode is executed, the first water inlet on-off valve, the third water inlet on-off valve, and the fourth water inlet on-off valve are closed, the second water inlet on-off valve is opened, the flow control pump is started, and the booster pump works, and the raw water enters the water inlet path. The sterilization assembly releases disinfectant into the sterilization loop to form disinfectant liquid, and the disinfectant reaches a first concentration. The disinfectant liquid flows through at least part of the water inlet path (excluding the pre-composite filter core), the cross-linking water path, at least part of the pure water path (excluding the terminal water pipe and the faucet), and the sterilization loop to achieve circulating sterilization, and the circulating sterilization time is at least T1. The flow control pump adjusts the liquid flow into the disinfection module according to the detection value of the detection meter to ensure that the disinfectant in the sterilization loop reaches the first concentration. In this embodiment, T1 is not less than 1 min; taking sodium hypochlorite as an example, the residual chlorine concentration (i.e. the first concentration) is 30-100 ppm according to the effective chlorine.

[0060] After the high-concentration sterilization mode is executed, the reduced high-concentration sterilization mode (conversion from high-concentration sterilization liquid to low-concentration sterilization liquid) is executed, as shown in Figure 1 and Figure 4 , the flow control pump stops working, and the third water inlet on-off valve and the fourth water inlet on-off valve are opened. The booster pump works to allow the high-concentration disinfectant liquid to continue to flow back. The sterilization assembly stops releasing disinfectant into the sterilization loop; since the opening pressure of the high-pressure check valve is greater than the combined opening pressure of the fourth water inlet on-off valve and the second check valve, the pipelines where the fourth water inlet on-off valve and the second check valve are located are in an open state. The disinfectant liquid in the sterilization loop enters the pre-composite filter core after passing through the sterilization assembly, and the disinfectant concentration of the disinfectant liquid flowing out of the pre-composite filter core is reduced due to the action of the activated carbon in the pre-composite filter core.

[0061] As shown in Figure 1 and Figure 5As shown, the low-concentration sterilization mode is: the first and fourth water inlet on-off valves are opened, the second water inlet on-off valve is closed, the flow control pump is started, and the booster pump is working. The sterilization assembly puts disinfecting substances into the sterilization loop to form disinfecting liquid. The flow control pump adjusts the water flow into the disinfection module according to the detection value of the detection meter, so that the disinfecting substances reach the second concentration, which is lower than the first concentration.

[0062] The disinfecting liquid flows through the part of the water inlet water path including the pre-composite filter cartridge, enters the filter cartridge assembly, and the obtained pure water returns to the sterilization loop through the post-carbon filter cartridge, the first one-way valve, and part of the pure water path. The pure water does not pass through the end water pipe and faucet of the pure water path. The whole pipeline is subjected to circulating sterilization and disinfection, and the disinfecting liquid is circulated for at least T2. The concentrated water combination valve is started, the concentrated water carrying disinfecting substances flows out through the concentrated water path, and the concentrated water path is sterilized while being discharged. In this embodiment, T2 is not less than 3 minutes; taking sodium hypochlorite as an example, the residual chlorine concentration (second concentration) is 0.5-20 ppm according to the effective chlorine.

[0063] In order to prove that the reverse osmosis membrane can be sterilized and disinfected for a short time without damaging its use effect, six filter cartridges are immersed in a 400 ppm sodium hypochlorite solution, and one is taken out at intervals for testing. The specific test conditions are: 0.41 MPa water inlet pressure, 35% recovery rate, pure water flushing for 30 minutes, and water solution for testing water efficiency. When the reverse osmosis membrane is immersed in a high-concentration sodium hypochlorite solution for less than 24 hours, the desalination effect is tested: raw water conductivity 1012, water flow (ml / min) 255, water conductivity 46, desalination rate 95.5%, and recovery rate 36.3%, indicating that the reverse osmosis membrane has short-time chlorine resistance.

[0064] As shown in Figure 1 and Figure 6 After the low-concentration sterilization mode is executed, the pure water backwashing mode is started: the first, third, and fourth water inlet on-off valves are opened, the second water inlet on-off valve is closed, the flow control pump is stopped, and the booster pump is working. The raw water enters the filter cartridge assembly through the water inlet path, and the obtained pure water enters the pre-composite filter cartridge after passing through the sterilization assembly, realizing the circulating flow of pure water, and the circulating flow time is at least T3. In this embodiment, T3 is not less than 15 seconds. After pure water backwashing, the disinfecting liquid in all water paths in the water purification system is basically adsorbed by the pre-composite filter cartridge, and there is no bad feeling such as disinfecting liquid odor, which does not affect the user's experience of the first cup of water. After the whole pipeline is purified and the pure water is backwashed, the service life of the reverse osmosis membrane is prolonged.

[0065] Note that the above merely describes preferred embodiments of the present application and the applied technical principles. Those skilled in the art will understand that the present application is not limited to the specific embodiments described herein, and that various obvious changes, modifications and substitutions can be made without departing from the scope of the present application. Therefore, although the present application has been described in detail through the above embodiments, the present application is not limited to the above embodiments, and can include more other equivalent embodiments without departing from the concept of the present application, and the scope of the present application is determined by the scope of the claims.

Claims

1. A water purification system, characterized in that, include: Filter assembly, including filter element; The water inlet channel is connected to the water inlet end of the filter element; A pure water path is connected to the outlet end of the filter element assembly; A sterilization circuit includes a sterilization component, wherein the inlet end of the sterilization component is connected to the pure water circuit, and the outlet end of the sterilization component is connected to the inlet water circuit; and, A bridging water circuit is provided, with one end connected to the inlet water circuit and the other end connected to the pure water circuit. The bridging water circuit includes a second inlet on / off valve installed on the water pipe. Liquid in the inlet water circuit can selectively flow into the filter element or into the bridging water circuit. The water inlet path includes a pre-filter composite element and a pressure reducing valve arranged sequentially along the water flow direction. The water outlet of the sterilization component is connected to the water inlet path between the pre-filter composite element and the pressure reducing valve through a high-pressure one-way valve, and to the water inlet path upstream of the pre-filter composite element through a fourth water inlet on / off valve and a second one-way valve.

2. The water purification system according to claim 1, characterized in that, The sterilization component includes a disinfection module, a flow control pump, and a third inlet on / off valve. The disinfection module and the flow control pump are connected in series and then connected in parallel with the third inlet on / off valve.

3. The water purification system according to claim 2, characterized in that, The disinfection module is a container containing sodium hypochlorite solution, a container containing chlorine dioxide tablets, and / or a container containing plant bactericidal extract.

4. The water purification system according to claim 1, characterized in that, The water inlet circuit also includes a booster pump and a first water inlet shut-off valve arranged sequentially along the water flow direction. The first water inlet shut-off valve is connected to the water inlet end of the filter element, and one end of the bridging water circuit is connected to the water inlet circuit between the booster pump and the first water inlet shut-off valve.

5. The water purification system according to any one of claims 1 to 4, characterized in that, The filter assembly also includes a post-carbon filter element connected to the water outlet end of the filter element.

6. The water purification system according to any one of claims 1 to 4, characterized in that, The pure water circuit includes a detector, and the inlet of the sterilization component is connected to the pure water circuit downstream of the detector.

7. The water purification system according to claim 6, characterized in that, The detector is a residual chlorine detector, a TDS probe, and / or a flow meter.

8. A sterilization control method within a water purification system, based on a water purification system as described in any one of claims 1 to 7, characterized in that, The sterilization control method includes a high-concentration sterilization mode and a low-concentration sterilization mode. When the high-concentration sterilization mode is executed, the disinfectant liquid flows through the water path except for the filter element assembly. When the low-concentration sterilization mode is executed, the disinfectant liquid flows through the water path including the filter element assembly. When the high-concentration sterilization mode is executed, the concentration of disinfectant in the disinfectant liquid is higher than the concentration of disinfectant in the disinfectant liquid when the low-concentration sterilization mode is executed.

9. The sterilization control method inside the water purification system according to claim 8, characterized in that, The conditions for starting the sterilization control method are as follows: If the user requires sterilization, they can directly start the sterilization program; or... Determine whether the water purification system is being installed and used for the first time. If so, start the sterilization program directly. Otherwise, record the interval working time t. Determine whether the interval working time t is greater than or equal to the disinfection and sterilization time T required for continuous non-operation. If so, start the sterilization program.

10. The sterilization control method inside the water purification system according to claim 9, characterized in that, The sterilization process includes, in sequence, the high-concentration sterilization mode, the reduced high-concentration sterilizing agent mode, the low-concentration sterilization mode, and the pure water reflux rinsing mode.

11. The sterilization control method inside the water purification system according to claim 10, characterized in that, The high-concentration sterilization mode is as follows: the sterilization component adds a disinfectant to the sterilization circuit to form the disinfectant liquid, the disinfectant reaches a first concentration, and the disinfectant liquid flows through at least part of the inlet water path, the bridging water path, at least part of the pure water path, and the sterilization circuit to achieve cyclic sterilization, and the cyclic sterilization time is at least T1. The high-concentration disinfectant reduction mode is as follows: the inlet water path includes a pre-filter composite element, and activated carbon is installed inside the pre-filter composite element; the disinfection component stops adding the disinfectant to the disinfection circuit, and the disinfectant liquid in the disinfection circuit passes through the disinfection component and enters the pre-filter composite element, and the concentration of disinfectant in the disinfectant liquid flowing out of the pre-filter composite element is reduced; The low-concentration sterilization mode is as follows: the sterilization component adds the disinfectant to the sterilization circuit to form the disinfectant liquid, the disinfectant reaches a second concentration, which is lower than the first concentration, the disinfectant liquid flows through at least part of the inlet water path including the pre-filter composite filter element and then enters the filter element assembly, the resulting pure water flows through part of the pure water path and then returns to the sterilization circuit, and the concentrated water carrying the disinfectant flows out through the concentrated water path; the sterilization time of the disinfectant liquid is at least T2. The pure water reflux rinsing mode is as follows: raw water enters the filter element assembly through the water inlet path, and the obtained pure water passes through the sterilization component and enters the pre-filter composite element to realize the circulation of pure water. The circulation time is at least T3.

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