Water purifier, water purification system and control method thereof

Abstract

The invention provides a water purifier, a water purification system and a control method thereof.The water purifier comprises a central filter element, a raw water pipeline, a purified water pipeline and a concentrated water pipeline, the raw water pipeline is connected between a water inlet and a filter element raw water opening of the central filter element, and the purified water pipeline is connected between a filter element purified water opening and a water taking opening of the central filter element; and the concentrated water pipeline is connected between the filter element concentrated water port and the water outlet of the central filter element. A conveying control assembly is arranged on the raw water pipeline, and the conveying control assembly is at least used for controlling water conveying or water stopping of the raw water pipeline; a waste water control valve is arranged on the concentrated water pipeline. The water purifier has a washing mode, the water purifier further comprises a controller, and the controller is used for executing washing operation including controlling the conveying control assembly to enable the raw water pipeline to convey water and controlling the waste water control valve to be opened after the water conveying time reaches a first time when the time of stopping outputting the purified water reaches a first preset time threshold value in the washing mode. Therefore, the water purifier can perform flushing operation on the central filter element and the water purification pipeline.

Description

Technical Field

[0001] The present invention relates to the technical field of water treatment, and in particular, to a water purifier, a water purification system and a control method thereof. Background Art

[0002] With the development of the times, people's requirements for the quality of drinking water are getting higher and higher, and water purifiers have been recognized and purchased by most people. Water purifiers on the market can include tabletop water purifiers, under-counter water purifiers, built-in water purifiers, etc., which can purify the water in tap water or water tanks to provide high-quality purified water to users.

[0003] Some water purifiers on the market use, for example, reverse osmosis filters, nanofiltration filters, etc. These filters will produce a certain proportion of concentrated water during the water production process. Most harmful substances, such as heavy metals, bacteria, etc., will be discharged with the concentrated water, and the treated purified water can be transported to users through pipelines.

[0004] Although the filter can filter out most of the impurities in the water, the output purified water may still deteriorate under the action of residual bacteria in the water or bacteria from the water outlet. After the filter removes the residual chlorine in the tap water, the risk of the purified water deteriorating becomes greater. In the case where the user does not draw water for a long time, bacteria may multiply in the residual purified water in the pipeline. Sometimes, when the water purifier is not used for several months or even weeks, a serious odor may occur, resulting in the scrapping of the filter. Summary of the Invention

[0005] To at least partially solve the problems existing in the prior art, some embodiments of the present invention provide a water purifier, which has a water inlet, a drain outlet, and a water intake. The water purifier is characterized in that it includes a central filter element, a raw water pipeline, a purified water pipeline, and a concentrated water pipeline. The central filter element has a raw water inlet of the filter element, a purified water outlet of the filter element, and a concentrated water outlet of the filter element. The raw water pipeline is connected between the water inlet and the raw water inlet of the filter element. The purified water pipeline is connected between the purified water outlet of the filter element and the water intake. The concentrated water pipeline is connected between the concentrated water outlet of the filter element and the drain outlet, wherein: a conveying control assembly is provided on the raw water pipeline, and the conveying control assembly is at least used to control the water conveyance or water cut-off of the raw water pipeline; a waste water control valve is provided on the concentrated water pipeline, and the waste water control valve has a first flow rate restricted by a waste water ratio in the closed state and a second flow rate not restricted by the waste water ratio in the open state; the water purifier has a flushing mode, and the water purifier further includes a controller, and the controller is used to, in the flushing mode, when the duration of the water intake port stopping outputting purified water reaches a first preset duration based on a first electrical signal indicating that the user stops taking water, perform a flushing operation, wherein: the flushing operation includes controlling the conveying control assembly to make the raw water pipeline convey water, and controlling the waste water control valve to open after the water conveyance duration reaches a first duration. Thus, the water purifier can automatically perform a flushing operation on the central filter element and the purified water pipeline when the user does not take water for a long time. The flushing operation can timely destroy the breeding environment of bacteria, prevent peculiar smell, and extend the service life of the central filter element, improving the user experience. Timing is based on the user's water intake stop information, and the timing logic is relatively simple and reliable. And compared with the existing water purifiers that can only flush the filter element, the water purifier of the present application can further flush the purified water pipeline, and the cleaning effect is better.

[0006] Exemplarily, the flushing operation controlled by the controller further includes: after the waste water control valve is opened for a second duration, controlling the conveying control assembly to cut off the water supply of the raw water pipeline. Stopping flushing after an appropriate time can reduce water consumption.

[0007] Exemplarily, the water purifier further includes a temperature sensor, and the controller is further used to control the second duration according to the temperature detected by the temperature sensor, and the temperature is positively correlated with the second duration. The higher the temperature, the faster the bacteria breeding speed. By appropriately extending the working duration of the conveying control assembly, a better flushing effect on the central filter element can be achieved, thus effectively coping with the bacteria breeding problem caused by temperature rise.

[0008] Exemplarily, the flushing operation controlled by the controller further includes: after the raw water pipeline is cut off for a third duration, controlling the waste water control valve to close. After the flushing operation is completed, closing the waste water control valve can save energy and extend its service life. Closing the waste water control valve can also weaken the influence of the sewer environment on the water purifier to a certain extent.

[0009] Exemplarily, the third duration is greater than the second duration. The rate of forward osmosis is very slow. Therefore, sufficient time is required to drain all the purified water used for flushing.

[0010] Exemplarily, the second duration is greater than the first duration. When the water purification pipeline is filled with water such that the pressure is the same as the rated pressure of the booster pump, it may cause the booster pump to run idly. This may accelerate the overheating and aging of the booster pump. In contrast, opening the waste water control valve to flush the central filter element will not overly burden the booster pump. Moreover, after the waste water control valve is opened, the water purification pipeline quickly relieves pressure, so that the time for the water purification pipeline to bear pressure is short, which can also effectively delay the aging of the water purification pipeline.

[0011] Exemplarily, the controller is further configured to, in the flushing mode, after the flushing operation is completed and before receiving the second electrical signal indicating that the user starts to draw water, perform the flushing operation again every second preset duration. Thereby ensuring that bacteria in the pipeline do not multiply massively and concentratedly, and ensuring the cleanliness of the water purification pipeline.

[0012] Exemplarily, the water purifier further includes a temperature sensor, and the controller is further configured to control the second preset duration threshold according to the temperature detected by the temperature sensor, and the temperature is negatively correlated with the second preset duration. This can better maintain the cleanliness of the water purification pipeline.

[0013] Exemplarily, the water purifier further includes a water stop solenoid valve provided on the water purification pipeline. The flushing operation controlled by the controller further includes: based on the first electrical signal, when it is determined that the duration for the water intake port to stop outputting purified water reaches the third preset duration, controlling the water stop solenoid valve to close, where the third preset duration is less than the first preset duration; and during the execution of the flushing operation, controlling the water stop solenoid valve to open. When the water stop solenoid valve is closed, the connection between the internal pipeline of the water purifier and the external water purification pipeline can be cut off. This can reduce the number of bacteria migrating from the internal water purification pipeline of the water purifier and the water purification cavity to the water purification pipeline with accumulated water, and slow down the reproduction of bacteria in the water purification pipeline. The third duration is less than the first duration, so that the water stop solenoid valve can be closed in time. After the water stop solenoid valve is opened, the purified water obtained by the flushing operation can enter the water purification pipeline (even reach the valve core where the faucet is closed), and play a role in flushing the entire water purification pipeline.

[0014] Exemplarily, the third preset duration is determined by the duration for the pressure in the water purification pipeline to be released to be lower than the preset pressure threshold. Thereby, the third preset duration can be determined. The third preset duration can reserve a certain margin to ensure that the water in the water purification pipeline is drained. By timing to control the closing of the water stop solenoid valve, no additional sensor is required, the structure is simple, and the control logic is reliable.

[0015] Exemplarily, the controller is further configured to control the water stop solenoid valve to open based on the second electrical signal indicating that the user starts to draw water. Thereby, the purified water can reach the water intake port for the user to use.

[0016] Exemplarily, the water purifier further includes a temperature sensor for detecting the temperature in the environment and / or any pipeline and / or the central filter element of the water purifier. The controller is further configured to enter a flushing mode when determining that the detected temperature of the temperature sensor is higher than a preset temperature threshold. Thus, flushing operations can be avoided in low-temperature situations, thereby saving water, and automatic flushing operations can be performed when the temperature is high to prevent rapid bacterial reproduction and odor generation.

[0017] Exemplarily, the temperature sensor includes a raw water temperature sensor disposed in the raw water pipeline or the raw water chamber of the central filter element for detecting the raw water temperature, and the detected temperature includes the raw water temperature. By detecting the water temperature of the raw water to confirm whether the temperature is higher than the preset temperature threshold, the reliability is higher compared to determining whether to enter the flushing mode based on the ambient temperature.

[0018] Exemplarily, the temperature sensor includes a purified water temperature sensor disposed in the purified water pipeline or the purified water chamber of the central filter element for detecting the purified water temperature, and the detected temperature includes the purified water temperature. Based on the detected purified water temperature, it plays a role in controlling whether to perform flushing operations, which can further improve the reliability of the water purifier in performing flushing operations.

[0019] Exemplarily, the detected temperature is obtained during the output of purified water at the water intake. Only when there is water in the purified water chamber and the purified water pipeline can the temperature of the purified water be correctly detected.

[0020] Exemplarily, the temperature sensor includes a purified water temperature sensor disposed in the purified water pipeline or the purified water chamber of the central filter element for detecting the purified water temperature. The controller is further configured to: respectively obtain the purified water temperature during or within a preset time period after continuously performing flushing operations multiple times, and when the purified water temperatures are all lower than the preset temperature threshold, control the water purifier to exit the flushing mode. In this way, even due to sudden fluctuations in water temperature, flushing operations will continue for a period of time, avoiding a long time without flushing operations caused by a short-term decrease in water temperature, which may lead to a large number of bacteria multiplying. And as described above, detecting the purified water temperature is most closely related to preventing a large number of bacteria from multiplying in the purified water pipeline, making the flushing function more effective.

[0021] Exemplarily, the water purifier further includes an operation component for receiving user operations, and the controller is further configured to turn on or exit the flushing mode based on the operations. The user can also exit the flushing mode to reduce the consumed water volume or avoid the noise of flushing affecting life.

[0022] Exemplarily, the controller is further configured to exit the flushing mode when receiving a second electrical signal indicating that the user starts to draw water. The user drawing water means that the user has returned, and usually, water can be drawn regularly next, without the situation of no one drawing water for a long time, so there is no need for automatic flushing work.

[0023] Exemplarily, the water purifier further includes a communication module. The communication module is used to obtain temperature information about the local temperature via the Internet. The controller is further used to: enter the flushing mode when it is determined that the local temperature is higher than a preset temperature threshold according to the temperature information. Thus, the water purifier enters the flushing mode more intelligently and accurately, with relatively high reliability.

[0024] On the other hand, the present application provides a water purification system, which includes: the above-mentioned water purifier; and a faucet. The faucet is connected to the water intake of the water purifier. The faucet has a mechanical valve for controlling the on / off of the water path and a detection element. The detection element is used to send a second electrical signal indicating that the user starts to draw water to the controller of the water purifier when the mechanical valve is opened, and is further used to send a first electrical signal indicating that the user stops drawing water to the controller when the mechanical valve is closed. Thus, the controller can start timing based on the first electrical signal indicating that the user stops drawing water to determine whether to perform a flushing operation.

[0025] Exemplarily, the detection element includes a Hall element for detecting the switch state of the mechanical valve. The Hall element is simple to install, has a relatively low cost, and the corresponding controller circuit is also simpler.

[0026] On the other hand, the present application provides a method for controlling a water purifier. The water purifier has a water inlet, a drain outlet, and a water intake. The water purifier further includes a central filter element, a raw water pipeline, a purified water pipeline, and a concentrated water pipeline. The central filter element has a raw water inlet, a purified water outlet, and a concentrated water outlet. The raw water pipeline is connected between the water inlet and the raw water inlet of the filter element. The purified water pipeline is connected between the purified water outlet of the filter element and the water intake. The concentrated water pipeline is connected between the concentrated water outlet of the filter element and the drain outlet. Among them: a conveying control component is arranged on the raw water pipeline, and the conveying control component is at least used to control the water conveyance or water cut-off of the raw water pipeline; a waste water control valve is arranged on the concentrated water pipeline. The waste water control valve has a first flow rate restricted by the waste water ratio in the closed state and a second flow rate not restricted by the waste water ratio in the open state. The method in the flushing mode includes: receiving the first electrical signal indicating that the user stops drawing water, and accumulating the water supply duration during which the water intake stops outputting purified water; when the accumulated water supply duration reaches a first preset duration, controlling to perform a flushing operation, and the flushing operation includes: controlling the conveying control component to make the raw water pipeline convey water; and, controlling the waste water control valve to open after the water conveyance duration reaches a first duration.

[0027] Exemplarily, after the step of controlling the waste water control valve to open in the flushing operation, it further includes: controlling the conveying control component to cut off the water supply of the raw water pipeline when the opening duration of the waste water control valve reaches a second duration.

[0028] Exemplarily, after the step of cutting off the water supply of the raw water pipeline in the flushing operation, it further includes: controlling the waste water control valve to close when the water cut-off duration of the raw water pipeline reaches a second duration.

[0029] Exemplarily, after the first flushing operation is completed in the flushing mode and before the second electrical signal indicating that the user starts to draw water is received, the flushing operation is performed again every second preset time period.

[0030] Exemplarily, the water purification machine further includes a water stop solenoid valve provided on the water purification pipeline, and the method further includes: based on the first electrical signal, when it is determined that the duration of the water intake port stopping outputting purified water reaches a third preset time period, controlling the water stop solenoid valve to close, where the third preset time period is less than the first preset time period; and during the flushing operation, controlling the water stop solenoid valve to open.

[0031] Exemplarily, the method further includes: respectively obtaining the purified water temperature in the water purification pipeline or the purified water cavity of the central filter element during or after continuously performing the flushing operation for multiple times; and when the purified water temperatures are all lower than a preset temperature threshold, controlling the water purification machine to exit the flushing mode.

[0032] Exemplarily, the method further includes: detecting the temperature of the water purification machine or the environment, and entering the flushing mode when the detected temperature is higher than a preset temperature threshold.

[0033] Exemplarily, the method further includes: receiving the operation of the user, and based on the operation, turning on or exiting the flushing mode.

[0034] Exemplarily, the method further includes: receiving temperature information about the local temperature, and entering the flushing mode when it is determined according to the temperature information that the local temperature is higher than a preset temperature threshold.

[0035] Exemplarily, the method further includes: exiting the flushing mode when the second electrical signal indicating that the user starts to draw water is received.

[0036] A series of simplified concepts are introduced in the summary of the invention, which will be further described in detail in the detailed implementation section. The summary of the invention does not mean to attempt to define the key features and essential technical features of the claimed technical solution, nor does it mean to attempt to determine the protection scope of the claimed technical solution.

[0037] The following will, with reference to the accompanying drawings, elaborate on the advantages and features of the present invention in detail. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] The following drawings of the present invention are hereby incorporated as part of the present invention for understanding the present invention. The embodiments and descriptions thereof shown in the drawings are used to explain the principles of the present invention. In the drawings,

[0039] Figure 1 is a water circuit diagram of a water purification machine according to an exemplary embodiment of the present invention;

[0040] Figure 2A water circuit diagram of a water purifier according to another exemplary embodiment of the present invention;

[0041] Figure 3 A water circuit diagram of a water purification system according to another exemplary embodiment of the present invention;

[0042] Figure 4 A schematic block diagram of a control method for a water purification system according to an exemplary embodiment of the present invention;

[0043] Figure 5 A schematic flow chart of a control method for a water purification system according to another exemplary embodiment of the present invention.

[0044] Wherein, the above-mentioned drawings include the following reference numerals:

[0045] 11, water inlet; 12, drain outlet; 13, water intake; 20, raw water pipeline; 30, purified water pipeline; 40, concentrated water pipeline; 100, conveying control assembly; 110, booster pump; 120, inlet solenoid valve; 200, central filter element; 210, raw water port of the filter element; 220, purified water port of the filter element; 230, concentrated water port of the filter element; 300, faucet; 400, waste water control valve; 500, water stop solenoid valve; 600, temperature sensor; 700, pre-filter element. Detailed implementation manners

[0046] In the following description, a large number of details are provided to enable a thorough understanding of the present invention. However, those skilled in the art can understand that the following description only exemplarily shows the preferred embodiments of the present invention, and the present invention can be implemented without one or more of such details. In addition, in order to avoid confusion with the present invention, some well-known technical features in the art are not described in detail.

[0047] In order to thoroughly understand the embodiments of the present invention, detailed structures will be presented in the following description. Obviously, the implementation of the embodiments of the present invention is not limited to the special details familiar to those skilled in the art. The preferred embodiments of the present invention are described in detail below. However, in addition to these detailed descriptions, the present invention may also have other embodiments.

[0048] Embodiments of the present invention provide a water purifier. The water purifier according to the embodiments of the present invention will be introduced in detail below with reference to the accompanying drawings.

[0049] As Figure 1As shown in the figure, the water purifier may have a water inlet 11, a drain outlet 12, and a water intake 13. The water inlet 11 is used to obtain raw water, including but not limited to municipal tap water, barreled water, well water, etc. The water purifier further includes a central filter element 200, a raw water pipeline 20, a purified water pipeline 30, and a concentrated water pipeline 40. The central filter element 200 has a filter element raw water inlet 210, and the raw water pipeline 20 is connected between the water inlet 11 and the filter element raw water inlet 210. The central filter element 200 further has a filter element purified water outlet 220 and a filter element concentrated water outlet 230. The purified water pipeline 30 is connected between the filter element purified water outlet 220 and the water intake 13, and is used to provide purified water filtered by the central filter element 200 to the user. The concentrated water pipeline 40 is connected between the filter element concentrated water outlet 230 and the drain outlet 12. The drain outlet 12 can communicate with the outside, and is used to discharge the concentrated water generated by the filtration of the central filter element 200. Specifically, for example, the drain outlet 12 can be connected to a drain pipe, and the drain pipe can be connected to a sewer or a container for collecting concentrated water. The user can use the concentrated water in the container for various purposes when needed. The user can reuse the collected concentrated water to save water.

[0050] Wherein, a conveying control assembly 100 is arranged on the raw water pipeline 20, and the conveying control assembly 100 is at least used to control the water conveyance or water cut-off of the raw water pipeline 20. As described above, the central filter element 200 can include a reverse osmosis filter element, a nanofiltration filter element, etc. These central filter elements 200 usually require a certain pressure when working. In some embodiments, the conveying control assembly 100 can include a booster pump 110, and the booster pump 110 can boost the pressure of the raw water to make the water pressure meet the working pressure of the central filter element 200. In some embodiments, the booster pump 110 can have a cut-off function. When the water inlet 11 of the water purifier is connected to municipal tap water, raw water will be provided to the central filter element 200 only when the booster pump 110 works. In other embodiments, the conveying control assembly 100 can include a water inlet solenoid valve 120. The water inlet solenoid valve 120 can prevent water from flowing out from the water intake 13 and the drain outlet 12 under the pressure of municipal tap water when the water purifier is not working.

[0051] In some embodiments, the conveying control assembly 100 can only include the water inlet solenoid valve 120 without including the booster pump 110. Although the central filter element 200 can only output purified water at a rated flow rate under the rated raw water pressure, it does not mean that purified water cannot be produced under a raw water pressure lower than the rated value. Generally, it can be considered that the lower limit of the water pressure of municipal tap water is 0.1 MPa, and the upper limit will not be higher than 0.4 MPa. Taking the water pressure of tap water being 0.2 - 0.3 MPa under normal circumstances as an example, this water pressure is lower than the water pressure that the booster pump 110 can provide (0.6 - 0.7 MPa). Therefore, under the action of the tap water pressure, the central filter element 200 can output purified water with a flow rate of about one-third of the rated flow rate. For the water purifiers of these embodiments, this flow rate can meet the usage requirements.

[0052] A wastewater control valve 400 may be provided on the concentrate pipeline 40, with a first flow rate limited by the wastewater ratio and a second flow rate not limited by the wastewater ratio in the open state. Raw water is under pressure, clean water passes through the central filter element, and the ratio of clean water to the remaining concentrate that has not passed through the central filter element is the wastewater ratio. The wastewater ratio can be limited by, for example, the structure of a wastewater ratio valve. In a specific example, the wastewater control valve includes a valve core provided with a small hole, and this valve core can serve as a wastewater ratio valve. When the wastewater control valve 400 is closed, the wastewater ratio can maintain the pressure required for the central filter element 200 to work, and allow a certain flow of concentrate to pass through the wastewater control valve 400. When the wastewater control valve 400 is in the open state, raw water can quickly pass through the wastewater control valve 400 from a passage other than the wastewater ratio, thereby flushing the central filter element 200. When the water purifier is not producing water, the raw water in the raw water chamber can flow out from the wastewater control valve 400, and the water in the clean water pipeline 30 and the clean water chamber of the central filter element 200 can also flow out from the wastewater control valve 400 under the action of forward osmosis.

[0053] The water purifier may have a flushing mode. The water purifier also includes a controller, which is used to perform a flushing operation in the flushing mode after determining that the time for the water inlet 13 to stop outputting purified water reaches a preset time based on the first electrical signal indicating that the user stops drawing water. The water purifier may include an operating component for obtaining the user's water drawing operation. In one embodiment, the operating component may include a water drawing button. When the user presses the water drawing button, the operating component sends out a second electrical signal indicating that the user starts drawing water, and sends out a first electrical signal indicating that the user stops drawing water when the water drawing button is released. In another embodiment, the operating component may include a water drawing button and a stop water drawing button. Pressing the two buttons can respectively send out a second electrical signal and a first electrical signal. In yet another embodiment, the operating component may include a faucet 300 provided with a Hall element (see Figure 3 ). When the user turns on the faucet 300, the operating component can synchronously send out a second electrical signal when the waterway is opened, and when the faucet 300 is closed, the operating component can synchronously send out a first electrical signal indicating that the user has stopped taking water. The controller can start timing based on the first electrical signal indicating that the user has stopped taking water.

[0054] The flushing operation includes controlling the conveying control component 100 to convey water through the raw water pipeline 20. The water intake 13 can be connected to the faucet 300 or the water outlet through a pipeline. In an embodiment where the faucet 300 can cut off the waterway, the purified water can compress the air in the pipeline under the pressure of the booster pump 110 or the pressure of the municipal tap water and enter the purified water pipeline 30. In an embodiment where the faucet 300 does not have the function of cutting off the waterway, and in an embodiment where the water intake 13 is connected to the water outlet, the purified water will flow out of the faucet 300 or the water outlet to flush the purified water pipeline 30. In some embodiments, the water purifier can be an under-counter water purifier, and the water intake 13 can be connected to the faucet 300 above the cabinet. The pipeline inside the faucet 300 and the part close to the faucet 300 is vertically arranged and hardly accumulates water. Even if this part of the pipeline cannot be flushed due to the air pressure accumulated inside during the flushing operation, hardly any large amount of bacteria will multiply.

[0055] After the controller controls the water conveyance to reach the first duration, it can control the waste water control valve 400 to open. In an exemplary embodiment, the conveying control component 100 can operate until the waste water control valve 400 opens. The purified water produced when the waste water control valve 400 operates can flush the purified water pipeline 30. And after the waste water control valve 400 opens, the raw water in the raw water chamber is first discharged, and the purified water can permeate from the central filter element 200 to the raw water chamber and be discharged through the waste water control valve 400. In an embodiment where the faucet 300 cuts off the waterway, the compressed air can also apply pressure to the purified water in the pipeline to make it permeate back to the raw water chamber from the central filter element 200 faster.

[0056] In another embodiment, after the waste water control valve 400 opens, the conveying control component 100 can make the raw water pipeline 20 continue to convey water for a period of time. At this time, the central filter element 200 will not continue to produce water, and the raw water can quickly pass through the surface of the central filter element 200, thereby flushing the central filter element 200 and the raw water chamber. Taking the conveying control component 100 as the booster pump 110 as an example, in a specific embodiment, when performing the flushing operation, the controller can control the booster pump 110 to operate for 30 seconds, and at the 5th second when controlling the booster pump 110 to start working, control the waste water control valve 400 to open. Thus, water can be produced for 5 seconds and flushed for 25 seconds. In another specific embodiment, when performing the flushing operation, the controller can control the booster pump 110 to operate for 10 seconds, and after controlling the booster pump 110 to stop working, control the waste water control valve 400 to open. In other embodiments, the opening duration of the conveying control component 100 and the opening time of the waste water control valve 400 can also be other values.

[0057] The controller can be built with electronic components such as comparators, registers, and digital logic circuits, or implemented with processor chips such as single-chip microcontrollers, microprocessors, programmable logic controllers (PLCs), digital signal processors (DSPs), field-programmable gate arrays (FPGAs), programmable logic arrays (PLAs), application-specific integrated circuits (ASICs), and their peripheral circuits.

[0058] Thus, when the user does not draw water for a long time, the water purifier can automatically perform a flushing operation on the central filter element 200 and the water purification pipeline 30. The flushing operation can promptly destroy the breeding environment of bacteria, prevent peculiar smells, extend the service life of the central filter element 200, and improve the user experience. Timing is based on the user's water intake stop information, and the timing logic is relatively simple and reliable. Moreover, compared with existing water purifiers that can only flush the filter element, the water purifier of the present application can further flush the water purification pipeline 30, resulting in a better cleaning effect.

[0059] Exemplarily, the water purifier may further include a pre-filter element 700, which can filter large particulate impurities in the water, thereby extending the service life of the central filter element 200.

[0060] Exemplarily, the flushing operation controlled by the controller further includes: after the wastewater control valve 400 is opened for a second duration, controlling the conveying control assembly 100 to cut off the raw water pipeline 20. As described above, when the wastewater control valve 400 is opened, the conveying control assembly 100 can be controlled to continue conveying raw water to flush the raw water chamber and the central filter element 200. Stopping the flushing after an appropriate time can reduce water consumption. Exemplarily, the second duration can be greater than the first duration. For the embodiment in which the faucet 300 cuts off the water purification pipeline 30, since the amount of purified water that the water purification pipeline 30 can store is limited, when the water purification pipeline 30 is filled with water and the pressure is the same as the rated pressure of the booster pump 110, the booster pump 110 may run idly. This may accelerate the overheating and aging of the booster pump 110. In contrast, opening the wastewater control valve 400 to flush the central filter element 200 will not overly burden the booster pump 110. Moreover, after the wastewater control valve 400 is opened, the water purification pipeline 30 quickly relieves pressure, so that the time for the water purification pipeline 30 to bear pressure is short, which can also effectively delay the aging of the water purification pipeline 30.

[0061] After the flushing is completed, it is possible to wait for a long enough time to drain the water in the pure water pipeline 30, the pure water chamber, and the raw water chamber as much as possible. Exemplarily, the flushing operation controlled by the controller further includes: after the raw water pipeline 20 stops supplying water for a third duration, controlling the waste water control valve 400 to close. In a specific embodiment, the waste water control valve 400 can be controlled to close after the raw water pipeline 20 stops supplying water for 2 minutes. The waste water control valve 400 usually consumes electrical energy to open. After the flushing operation is completed, closing the waste water control valve 400 can save energy and extend its service life. Closing the waste water control valve 400 can also, to a certain extent, reduce the impact of the sewer environment on the water purifier.

[0062] Exemplarily, the third duration can be greater than the second duration. The raw water can quickly pass through the central filter element 200 under the pressure of the booster pump 110 or tap water, thereby producing pure water that enters the pure water chamber and the pure water pipeline 30. Only when the raw water in the raw water chamber is drained so that the pressure in front of the membrane is almost zero, the pure water in the pure water chamber after flushing the pipeline can osmose positively into the raw water chamber. The rate of positive osmosis is very slow. Therefore, sufficient time is required to drain all the pure water used for flushing. In some embodiments, the third duration can also be set according to the length of the pipeline. The longer the pure water pipeline 30, the longer the third duration is set accordingly.

[0063] Exemplarily, the controller is further configured to, in the flushing mode, after the flushing operation is completed and before receiving the second electrical signal indicating that the user starts to draw water, perform the flushing operation again every second preset duration. In some embodiments, the controller can perform the flushing operation once every 2 hours, so as to ensure that bacteria in the pipeline do not multiply in large numbers concentratedly and ensure the cleanliness of the pure water pipeline 30. It should be noted that, in the case of not exiting the flushing mode and not receiving the user's start water drawing electrical signal, the flushing operation will be performed every second preset duration, for example, once every two hours.

[0064] Figure 2Shows the water circuit diagram of another exemplary water purifier. Exemplarily, the water purifier may further include a water stop solenoid valve 500 provided on the water purification pipeline 30. The flushing operation controlled by the controller further includes: based on the first electrical signal, when it is determined that the duration for which the water intake port 13 stops outputting purified water reaches the third preset duration, controlling the water stop solenoid valve 500 to close, where the third preset duration is less than the first preset duration. And during the execution of the flushing operation, controlling the water stop solenoid valve 500 to open. Inside the water purifier, the layout of the pipelines is relatively reasonable. When correctly installed, by opening the wastewater control valve 400, most of the water in the water purification pipeline 30 inside the water purifier and the water in the purified water chamber can undergo forward osmosis into the raw water chamber and be discharged. However, the water purification pipelines 30 outside the water purifier may vary greatly due to different pipeline lengths, installation operations, etc., and there is a high possibility of water accumulation. The existence of water accumulation will accelerate the reproduction of bacteria. In one embodiment, the water stop solenoid valve 500 is provided at the end of the water purification pipeline 30 inside the water purifier, for example, at the water intake port 13. When the water stop solenoid valve 500 is closed, the connection between the pipeline inside the water purifier and the water purification pipeline 30 outside can be cut off. This can reduce the number of bacteria migrating from the water purification pipeline 30 inside the water purifier and the purified water chamber to the water purification pipeline 30 with water accumulation, and slow down the reproduction of bacteria in the water purification pipeline 30. The third duration is less than the first duration, so that the water stop solenoid valve can be closed in a timely manner. After the water stop solenoid valve 500 is opened, the purified water obtained from the flushing operation can enter the water purification pipeline 30 (even reach the valve core where the faucet 300 is closed), and play a role in flushing the entire water purification pipeline 30.

[0065] Exemplarily, the controller is further configured to control the water stop solenoid valve 500 to open based on the second electrical signal indicating that the user starts to draw water. Thus, the purified water can reach the water intake port for the user to use.

[0066] Exemplarily, the third preset duration is determined by the duration for which the pressure in the water purification pipeline 30 is released to be lower than the preset pressure threshold. When there is no purified water in the water purification pipeline 30, the pressure is close to the standard atmospheric pressure. During the flushing operation, the pressure in the water purification pipeline 30 will be greater than the standard atmospheric pressure. When the pressure in the water purification pipeline 30 returns to the standard atmospheric pressure, it is considered that the flushing purified water has been drained. Thus, the third preset duration can be determined. The third preset duration can reserve a certain margin to ensure that the water in the water purification pipeline 30 is drained. By timing to control the water stop solenoid valve 500 to close, there is no need to add sensors, the structure is simple, and the control logic is reliable.

[0067] In summer, the temperature may be very high, even reaching 35 - 40 °C. This temperature will significantly accelerate the reproduction of bacteria, causing the residual purified water in the water purifier to quickly produce an unpleasant smell, threatening the health of users. Exemplarily, the water purifier may further include a temperature sensor 600. The temperature sensor 600 can be used to detect the ambient temperature and can also be used to detect the temperature of the water in any pipeline of the water purifier, including the temperature of the raw water and the purified water. In some embodiments, the temperature sensor 600 can also be disposed in the central filter element 200, for example, disposed in the raw water chamber or the purified water chamber, to detect the temperature inside the central filter element 200. Of course, the temperature sensor can also be disposed at two of these locations simultaneously. Or disposed at all three of these locations simultaneously. The temperature of the water in the pipeline and the temperature inside the central filter element 200 are both affected by the ambient temperature. It can be considered that the higher the ambient temperature, the higher the temperatures of the other two will be. The temperature sensor 600 includes, but is not limited to, existing or future possible temperature sensors 600 such as thermocouples and thermal resistors. The controller is further configured to enter a flushing mode when determining that the detected temperature of the temperature sensor 600 is higher than a preset temperature threshold. The preset temperature threshold can be any temperature between 28 degrees and 45 degrees at intervals of 1 degree or 0.5 degrees. Thus, flushing operations can be avoided when the temperature is low, thereby saving water, and automatic flushing operations can be performed when the temperature is high to prevent the rapid reproduction of bacteria and the generation of unpleasant smells. This application does not exclude embodiments in which the temperature sensor 600 detects the temperature of the wastewater.

[0068] Exemplarily, the controller can also be used to control a second duration according to the temperature detected by the temperature sensor 600, and the temperature is positively correlated with the second duration. It is easy to understand that within the water temperature range of the water purifier (usually not higher than 45 degrees), the higher the temperature, the faster the bacteria reproduction rate. By appropriately extending the working duration of the conveying control assembly 100, a better effect can be achieved for flushing the central filter element 200, thereby effectively addressing the problem of bacteria reproduction caused by temperature increase. Specifically, for example, when the temperature is 30 degrees, the second duration can be 30 seconds, and when the temperature reaches 40 degrees, the second duration can be 45 seconds, and when it is 45 degrees, it can be 60 seconds. However, the second duration and the temperature may not be in direct proportion, as long as they are generally positively correlated.

[0069] For embodiments in which the controller, in the flushing mode, after the flushing operation is completed and before receiving a second electrical signal indicating that the user starts to draw water, performs the flushing operation again every second preset duration, the controller is further configured to control the second preset duration according to the temperature detected by the temperature sensor 600. The temperature is negatively correlated with the second preset duration. In other words, the higher the temperature, the shorter the interval between the executions of the flushing operation, and the more frequent the flushing. Specifically, for example, at 30 degrees, the flushing operation is performed once every 2 hours; at 40 degrees, the flushing operation is performed once every 1 hour. Thus, the cleanliness of the purified water pipeline 30 can be better maintained.

[0070] Exemplarily, the temperature sensor 600 may include a raw water temperature sensor 600, which is disposed in the raw water pipeline 20 or the raw water cavity of the central filter element 200 for detecting the raw water temperature. In such embodiments, the detected temperature includes the raw water temperature. Since there may be a difference between the air temperature and the water temperature, and the specific heat capacity of water is much larger than that of air, when the air temperature reaches 35 degrees, the water temperature may just reach 30 degrees. When the air temperature drops to 25 degrees, the water temperature may remain at 30 degrees. Thus, it can be seen that the water temperature has a large lag compared to the air temperature. By detecting the water temperature of the raw water to confirm whether the temperature is higher than the preset temperature threshold, the reliability is higher compared to judging whether to enter the flushing mode based on the ambient temperature.

[0071] The raw water temperature sensor 600 may preferably be disposed upstream of the conveying control assembly 100 of the water purifier. Whether it is the booster pump 110 or the inlet solenoid valve 120, heat will be generated during operation. This heat will affect the raw water temperature flowing through it, causing the water temperature to rise briefly. In some embodiments, the water temperature can even rise by 0.5 - 1 °C. Disposing the raw water temperature sensor 600 upstream can avoid the influence of this temperature and prevent misjudgment.

[0072] Since the central filter element 200 can filter bacteria from the raw water, generally there is no need to consider the generation of bacteria in the raw water. And as described above, the central filter element 200 filters out the disinfectant in the water, making it easier for bacteria to breed on the purified water side, and the bred bacteria will directly threaten the health of users. Exemplarily, the temperature sensor 600 may include a purified water temperature sensor 600, which is disposed in the purified water pipeline 30 or the purified water cavity of the central filter element 200 for detecting the purified water temperature. In such embodiments, the detected temperature includes the purified water temperature. According to the detected purified water temperature, it plays a role in controlling whether to perform the flushing operation, which can further improve the reliability of the water purifier in performing the flushing operation.

[0073] As described above, it is more reliable to detect the temperature of the purified water, but only when there is water in the purified water cavity and the purified water pipeline 30 can the temperature of the purified water be correctly detected. Therefore, in one exemplary embodiment, when receiving the second electrical signal, the temperature of the purified water temperature sensor 600 can be obtained after a few seconds. At this time, the purified water produced by the central filter element 200 can completely immerse the purified water temperature sensor 600, and an accurate value can be measured. In another exemplary embodiment, when receiving the first electrical signal, the temperature value of the purified water temperature sensor 600 can be obtained before or simultaneously with controlling the conveying control assembly 100 to stop working. In short, the temperature detection of the purified water is obtained during the output of the purified water at the water intake 13. If the obtained purified water temperature is higher than the preset temperature threshold, the flushing mode can be entered.

[0074] Exemplarily, when the temperature sensor 600 includes a purified water temperature sensor 600, the controller is further configured to: during or within a preset time period after continuously performing the flushing operation multiple times, obtain the purified water temperature respectively, and when the purified water temperatures are all lower than a preset temperature threshold, control the water purifier to exit the flushing mode. In this way, even if the water temperature fluctuates suddenly, the flushing operation will continue for a period of time, avoiding a large number of bacteria breeding caused by the non-execution of the flushing operation for a long time due to the short-term decrease in water temperature. And as described above, detecting the purified water temperature is most closely related to avoiding a large number of bacteria breeding in the purified water pipeline 30, making the flushing function more effective.

[0075] Exemplarily, the water purifier may further include a communication module. The communication module may include, for example, a WiFi module or a 4G module, etc., and is used to obtain temperature information about the local temperature via the Internet. In an exemplary embodiment, the communication module may further include a GPS module, and by obtaining the location information of the water purifier, thereby based on the location information, obtain the local temperature information. In another embodiment, the communication module may also determine the usage location of the water purifier based on the IP information of the Internet, and then determine the local temperature. This application does not exclude the embodiment of manually entering the area where the water purifier is located when the water purifier is installed and started.

[0076] The controller is further configured to: enter the flushing mode when it is determined that the local temperature is higher than a preset temperature threshold according to the temperature information. In some embodiments, the communication module may obtain the current temperature information in real time, and the controller determines whether to enter the flushing mode based on the real-time temperature information. In other embodiments, the communication module may obtain the temperature at each time period of the weather forecast via the Internet. The controller determines to enter the flushing mode within the time period when the temperature is higher than the preset temperature threshold based on the temperature at each time period, and exits the flushing mode when the temperature is lower than the preset temperature threshold. In some embodiments, the controller may enter the flushing mode when it is determined that the local temperature is higher than a preset temperature threshold according to the temperature information, and based on the raw water temperature or the purified water temperature detected by the temperature sensor of the water purifier, exit the flushing mode when it is determined that one or both of them are lower than the preset temperature threshold. In the above embodiments, when the controller detects the second electrical signal when the water purifier is in the flushing mode, it exits the flushing mode. Thus, the water purifier enters the flushing mode more intelligently and accurately, with higher reliability.

[0077] Exemplarily, the water purifier may further include an operation component, and the operation component is used to receive the user's operation. In addition to the buttons and Hall elements mentioned above, the operation component may further include a touch screen, software on a user terminal, etc. The controller is further configured to turn on or exit the flushing mode based on the operation.

[0078] In one embodiment, the user can manually turn on the flushing mode. In this way, when traveling or working outside, the water purifier can perform flushing operations automatically according to the environmental conditions and the idle time, ensuring reliable water quality. The user can also exit the flushing mode to reduce the consumed water volume or avoid the noise of flushing affecting life. In some embodiments, after the user controls to exit the flushing mode, the flushing mode can be automatically turned on after a period of time. For example, the user turns off the flushing mode after work, and the flushing mode is automatically turned on in the morning, so as to automatically flush during the user's working hours to ensure water quality.

[0079] Exemplarily, the controller is further configured to exit the flushing mode when receiving a second electrical signal indicating that the user starts to draw water. It is easy to understand that the user drawing water means that the user has returned, and usually can draw water regularly next, without the situation of no one drawing water for a long time, so there is no need to perform flushing work automatically.

[0080] On the other hand, the present application also provides a water purification system, which includes the above-mentioned water purifier and a faucet 300. The faucet 300 is connected to the water intake port 13 of the water purifier. The faucet 300 has a mechanical valve for controlling the on-off of the water path and a detection element. The detection element is configured to send a second electrical signal indicating that the user starts to draw water to the controller of the water purifier when the mechanical valve is opened, and is further configured to send a first electrical signal indicating that the user stops drawing water to the controller when the mechanical valve is closed. In some embodiments, the faucet 300 can be an intelligent faucet 300 with a mechanical valve, and can be connected to the controller by means such as serial communication, Bluetooth, etc. Thus, the controller can start timing based on the first electrical signal indicating that the user stops drawing water to determine whether to perform a flushing operation.

[0081] Exemplarily, the detection element can include a Hall element for detecting the switch state of the mechanical valve. The Hall element is simple to install, has a low cost, and the corresponding controller circuit is also simpler.

[0082] The present application also provides a method for controlling a water purifier. The water purifier has a water inlet, a drain outlet, and a water intake port. The water purifier further includes a central filter element, a raw water pipeline, a purified water pipeline, and a concentrated water pipeline. The central filter element has a filter element raw water port, a filter element purified water port, and a filter element concentrated water port. The raw water pipeline is connected between the water inlet and the filter element raw water port. The purified water pipeline is connected between the filter element purified water port and the water intake port. The concentrated water pipeline is connected between the filter element concentrated water port and the drain outlet.

[0083] Wherein: a conveying control component is arranged on the raw water pipeline, and the conveying control component is at least used to control the water conveyance or water cut-off of the raw water pipeline. A waste water control valve is arranged on the concentrated water pipeline. The waste water control valve has a first flow rate limited by the waste water ratio in the closed state and a second flow rate not limited by the waste water ratio in the open state.

[0084] Such asFigure 4 As shown, the method in the flushing mode includes:

[0085] Step S1: Receive a first electrical signal indicating that the user stops taking water, and accumulate the water supply duration during which the water intake port stops outputting purified water.

[0086] Step S2: When the accumulated water supply duration reaches a first preset duration, control to perform a flushing operation, and the flushing operation includes:

[0087] Step S21: Control the conveying control component to make the raw water pipeline convey water.

[0088] And step S22: Control the waste water control valve to open after the water conveying duration reaches a first duration.

[0089] Exemplarily, after step S22 of controlling the waste water control valve to open in the flushing operation, it further includes:

[0090] Step S3: When the opening duration of the waste water control valve reaches a second duration, control the conveying control component to cut off the water supply of the raw water pipeline.

[0091] Exemplarily, after step S3 of cutting off the water supply of the raw water pipeline in the flushing operation, it further includes:

[0092] Step S4: When the water cut-off duration of the raw water pipeline reaches a second duration, control the waste water control valve to close.

[0093] Exemplarily, after the first flushing operation is completed in the flushing mode and before receiving a second electrical signal indicating that the user starts taking water, the flushing operation is performed again every second preset duration.

[0094] Exemplarily, the water purifier further includes a water stop solenoid valve provided on the purified water pipeline, and the method further includes:

[0095] Based on the first electrical signal, when it is determined that the duration during which the water intake port stops outputting purified water reaches a third preset duration, control the water stop solenoid valve to close, where the third preset duration is less than the first preset duration; and during the flushing operation, control the water stop solenoid valve to open.

[0096] Exemplarily, the method further includes:

[0097] During or after consecutive multiple executions of the flushing operation within a preset time period, respectively obtain the purified water temperature in the purified water pipeline or the purified water cavity of the central filter element; and

[0098] When the purified water temperatures are all lower than a preset temperature threshold, control the water purifier to exit the flushing mode.

[0099] In one embodiment, the control method may further include detecting the temperature of the water purifier or the environment, and entering the flushing mode when the detected temperature is higher than a preset temperature threshold. In another embodiment, the control method may further include receiving temperature information about the local air temperature, and entering the flushing mode when it is determined based on the temperature information that the local air temperature is higher than the preset temperature threshold. In yet another embodiment, the method further includes receiving an operation of the user, and turning on or off the flushing mode based on the operation. In yet another embodiment, when a second electrical signal indicating that the user starts to draw water is received, the flushing mode is exited.

[0100] Figure 5 The flowchart of an exemplary embodiment of the present application is shown. The water purifier can obtain the raw water temperature of the raw water temperature sensor in real time, and enter the flushing mode when the raw water temperature is higher than the preset temperature threshold. During the output of purified water at the water intake, the purified water temperature of the purified water temperature sensor is obtained. Enter the flushing mode when the purified water temperature is higher than the preset temperature threshold. In the flushing mode, the duration of the stop of the output of purified water at the water intake can be determined, and flushing is performed every second preset duration. If a second electrical signal is received during the flushing mode, the flushing mode is exited and the purified water temperature is compared with the preset temperature threshold to determine whether to enter the flushing mode again. During each execution of the flushing operation, the purified water temperature is obtained. If the purified water temperature is lower than the preset temperature threshold for multiple consecutive times, the flushing mode is exited.

[0101] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by orientation words such as "front", "rear", "upper", "lower", "left", "right", "lateral", "vertical", "perpendicular", "horizontal" and "top", "bottom", etc. is usually based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description. Without contrary description, these orientation words do not indicate and imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation to the protection scope of the present invention; the orientation words "inner" and "outer" refer to the inside and outside relative to the contour of each component itself.

[0102] For ease of description, regional relative terms such as "above", "over", "on the upper surface", "upper", etc. can be used here to describe the regional positional relationship between one or more components or features shown in the figure and other components or features. It should be understood that regional relative terms not only include the orientation of components described in the figure but also different orientations during use or operation. For example, if the components in the attached figure are inverted as a whole, the component "above other components or features" or "over other components or features" will include the situation where the component is "below other components or structures" or "under other components or structures". Thus, the exemplary term "above" can include both the orientation of "above" and "below". In addition, these components or features can also be positioned at other different angles (such as rotated 90 degrees or other angles), and this document intends to cover all such situations.

[0103] It should be noted that the terms used here are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used here, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should also be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, components, assemblies, and / or combinations thereof.

[0104] It should be noted that the terms "first", "second", etc. in the description, claims, and above-mentioned drawings of the present application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such used data can be interchanged under appropriate circumstances so that the embodiments of the present application described here can be implemented in an order other than those illustrated or described here.

[0105] The present invention has been illustrated by the above embodiments, but it should be understood that the above embodiments are only for the purpose of exemplification and illustration, and are not intended to limit the present invention to the scope of the described embodiments. In addition, those skilled in the art can understand that the present invention is not limited to the above embodiments, and more variations and modifications can be made according to the teachings of the present invention, and these variations and modifications all fall within the scope of protection required by the present invention. The scope of protection of the present invention is defined by the appended claims and their equivalent scope.

Claims

1. A water purifier having a water inlet, a drain outlet and a water intake, characterized in that: The water purifier comprises a central filter element, a raw water pipeline, a clean water pipeline and a concentrated water pipeline. The central filter element has a filter element raw water inlet, a filter element clean water inlet and a filter element concentrated water inlet. The raw water pipeline is connected between the water inlet and the filter element raw water inlet, the clean water pipeline is connected between the filter element clean water inlet and the water intake, and the concentrated water pipeline is connected between the filter element concentrated water inlet and the drain outlet, wherein: The raw water pipeline is provided with a delivery control component, and the delivery control component is at least used to control the water delivery or water cut-off of the raw water pipeline; The concentrated water pipeline is provided with a wastewater control valve, which has a first flow rate limited by the wastewater ratio in a closed state and a second flow rate not limited by the wastewater ratio in an open state; The water purifier has a flushing mode. The water purifier also includes a controller, which is used to perform a flushing operation in the flushing mode after determining that the time when the water intake stops outputting purified water reaches a first preset time based on a first electrical signal indicating that the user stops taking water, wherein: the flushing operation includes controlling the delivery control component to open so that the raw water pipeline delivers water and controlling the wastewater control valve to open after the delivery control component is opened for a first time.

2. The water purifier according to claim 1, characterized in that: The flushing operation controlled by the controller also includes: after the wastewater control valve is opened for a second period of time, the delivery control component is controlled to be closed, and the raw water pipeline is cut off from water.

3. The water purifier according to claim 2, characterized in that: The water purifier also includes a temperature sensor, and the controller is further used to control the second time period according to the temperature detected by the temperature sensor, and the temperature is positively correlated with the second time period.

4. The water purifier according to claim 2, characterized in that: The flushing operation controlled by the controller further includes: controlling the wastewater control valve to close after the raw water pipeline is cut off from water for a third period of time.

5. The water purifier according to claim 4, characterized in that: The third duration is greater than the second duration.

6. The water purifier according to claim 2, characterized in that: The second duration is greater than the first duration.

7. The water purifier according to any one of claims 1 to 6, characterized in that: The controller is further configured to, in the flushing mode, perform the flushing operation again at a second preset time interval after the flushing operation is completed and before receiving a second electrical signal indicating that the user starts to take water.

8. The water purifier according to claim 7, characterized in that: The water purifier also includes a temperature sensor, and the controller is further used to control the second preset time length according to the temperature detected by the temperature sensor, and the temperature is negatively correlated with the second preset time length.

9. The water purifier according to any one of claims 1 to 6, characterized in that: The water purifier also includes a water stop solenoid valve arranged on the water purification pipeline. The flushing operation controlled by the controller also includes: Based on the first electrical signal, when it is determined that the time for the water intake to stop outputting purified water reaches a third preset time, the water stop solenoid valve is controlled to close, wherein the third preset time is less than the first preset time; and During the flushing operation, the water stop solenoid valve is controlled to open.

10. The water purifier according to claim 9, characterized in that: The third preset time duration is determined by the time duration for the pressure in the clean water pipeline to be released to a value lower than a preset pressure threshold.

11. The water purifier according to claim 9, characterized in that: The controller is further configured to control the water stop solenoid valve to open based on a second electrical signal indicating that the user starts to take water.

12. The water purifier according to any one of claims 1 to 6, characterized in that: The water purifier also includes a temperature sensor, which is used to detect the temperature of the environment and / or any pipeline of the water purifier and / or the central filter element. The controller is also used to enter the flushing mode when it is determined that the detected temperature of the temperature sensor is higher than a preset temperature threshold.

13. The water purifier according to claim 12, characterized in that: The temperature sensor includes a raw water temperature sensor, which is arranged in the raw water pipeline or the raw water cavity of the central filter element and is used to detect the raw water temperature. The detected temperature includes the raw water temperature.

14. The water purifier according to claim 12, characterized in that: The temperature sensor includes a purified water temperature sensor, which is arranged in the purified water pipeline or the purified water cavity of the central filter element and is used to detect the purified water temperature. The detected temperature includes the purified water temperature.

15. The water purifier according to claim 14, characterized in that: The detected temperature is obtained during the period when the water intake port outputs purified water.

16. The water purifier according to claim 12, characterized in that: The temperature sensor includes a purified water temperature sensor, which is arranged in the purified water pipeline or the purified water cavity of the central filter element and is used to detect the purified water temperature. The controller is also used to: obtain the purified water temperature respectively during or after a preset time period of performing the flushing operation for multiple consecutive times, and control the water purifier to exit the flushing mode when the purified water temperature is lower than the preset temperature threshold.

17. The water purifier according to claim 1, characterized in that: The water purifier further includes an operating component, which is used to receive an operation from a user. The controller is further configured to start or exit the flushing mode based on the operation.

18. The water purifier according to claim 1, characterized in that: The controller is also used to exit the flushing mode when receiving a second electrical signal indicating that the user starts to take water.

19. The water purifier according to claim 1, characterized in that: The water purifier further comprises a communication module, which is used to obtain temperature information about the local temperature via the Internet. The controller is also used to: enter the flushing mode when it is determined that the local temperature is higher than a preset temperature threshold according to the temperature information.

20. A water purification system, characterized in that: The water purification system comprises: The water purifier according to any one of claims 1 to 19; and A faucet connected to the water inlet of the water purifier, the faucet having a mechanical valve for controlling the on / off of the water path, and a detection element, the detection element being used to send a second electrical signal to the controller of the water purifier when the mechanical valve is opened, indicating that the user has started to draw water, and also being used to send a first electrical signal to the controller when the mechanical valve is closed, indicating that the user has stopped drawing water.

21. The water purification system according to claim 20, characterized in that: The detection element includes a Hall element for detecting a switching state of the mechanical valve.

22. A method for controlling a water purifier, characterized in that: The water purifier has a water inlet, a drain and a water intake, and further comprises a central filter element, a raw water pipeline, a clean water pipeline and a concentrated water pipeline. The central filter element has a filter element raw water inlet, a filter element clean water inlet and a filter element concentrated water inlet. The raw water pipeline is connected between the water inlet and the filter element raw water inlet, the clean water pipeline is connected between the filter element clean water inlet and the water intake, and the concentrated water pipeline is connected between the filter element concentrated water inlet and the drain, wherein: a delivery control component is provided on the raw water pipeline, and the delivery control component is at least used to control the water delivery or water cutoff of the raw water pipeline; a wastewater control valve is provided on the concentrated water pipeline, and the wastewater control valve has a first flow rate limited by the wastewater ratio in a closed state and has a second flow rate not limited by the wastewater ratio in an open state; The method comprises, in a flushing mode: receiving a first electrical signal indicating that the user stops taking water, and accumulating the water supply time during which the water intake stops outputting purified water; When the accumulated water supply time reaches a first preset time, a flushing operation is controlled to be performed, and the flushing operation includes: controlling the delivery control component to make the raw water pipeline deliver water; and controlling the wastewater control valve to open after the water delivery time reaches the first time.

23. The method according to claim 22, characterized in that The flushing operation further comprises, after the step of controlling the wastewater control valve to open: When the opening time of the wastewater control valve reaches a second time, the delivery control component is controlled to cut off the water supply to the raw water pipeline.

24. The method according to claim 22, characterized in that The flushing operation, after the step of cutting off the water supply to the raw water pipeline, further comprises: When the water cutoff time of the raw water pipeline reaches a second time, the wastewater control valve is controlled to be closed.

25. The method according to claim 22, characterized in that After the first flushing operation is completed in the flushing mode and before a second electrical signal indicating that the user starts to take water is received, the flushing operation is performed again every second preset time period.

26. The method according to claim 22, characterized in that The water purifier also includes a water stop solenoid valve arranged on the water purification pipeline. The method further comprises: Based on the first electrical signal, when it is determined that the time for the water intake to stop outputting purified water reaches a third preset time, the water stop solenoid valve is controlled to close, wherein the third preset time is less than the first preset time; and During the flushing operation, the water stop solenoid valve is controlled to open.

27. The method according to claim 22, characterized in that The method further comprises: During or after the flushing operation is performed multiple times in succession, obtaining the purified water temperature in the purified water pipeline or the purified water cavity of the central filter element; and When the purified water temperature is lower than the preset temperature threshold, the water purifier is controlled to exit the flushing mode.

28. The method according to claim 22, characterized in that The method further comprises: Detecting the temperature of the water purifier or the environment, and entering the flushing mode when the detected temperature is higher than a preset temperature threshold; or receiving temperature information about the local temperature, and entering the flushing mode when it is determined according to the temperature information that the local temperature is higher than a preset temperature threshold; or receiving a user operation, and starting or exiting the flushing mode based on the operation; or When a second electrical signal indicating that the user starts to take water is received, the flushing mode is exited.

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