Water purifier and control method thereof

Abstract

The embodiment of the invention provides a water purifier and a control method thereof, the water purifier is provided with a water inlet and a water taking port, the water purifier comprises a booster pump and a reverse osmosis filter element, the booster pump is connected between the water inlet and a raw water port of the reverse osmosis filter element, and a purified water port of the reverse osmosis filter element is connected to the water taking port; the control module is used for adjusting the working voltage U of the booster pump according to the target purified water flow Q of the purified water port of the reverse osmosis filter element, and the target purified water flow Q is in positive correlation with the working voltage U of the booster pump. The water outlet flow is adjusted through the booster pump, on one hand, the structure of the water purifier can be simplified, and cost is reduced. On the other hand, the matched working voltage can be provided for the booster pump according to the target purified water flow, so that the purified water port of the reverse osmosis filter element outputs purified water at the target purified water flow, a water tank and a water pump do not need to be arranged, it can be guaranteed that the water quality is fresh, the cost is further reduced, and energy can be saved when the target purified water flow is reduced.

Description

Technical Field

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

[0002] With the progress of technology, users' requirements for water purifiers have no longer been satisfied with only basic functions such as providing purified water, but they expect higher intelligence of water purifiers. For example, it is expected that the purified water flow rate of the water purifier can be adjusted. When the water intake amount set by the user is very small, it is desired that the purified water flow rate is low, or the initial flow rate is high and the flow rate is low when the water intake is almost finished, so as to accurately control the water intake amount. Or, currently, water purifiers usually have a heating function. When the water intake temperature of the user is high, it is desired that the purified water flow rate is low, and when the water intake temperature of the user is low, it is desired that the purified water flow rate is high.

[0003] In order to adjust the purified water flow rate, a water tank and a pump with adjustable flow rate are usually provided in the water purifier, and the pump is used to extract the purified water with a target flow rate to achieve the purpose of adjusting the purified water flow rate. For small-flux water purifiers, a water tank is already included inside, and the purified water prepared by the filter element can be stored in the water tank, and then extracted from the water tank according to the desired purified water flow rate. However, for large-flux water purifiers, the function of the water tank is not to store the pre-prepared purified water, but to cache the excess purified water prepared by the filter element when the purified water flow rate is small.

[0004] Adopting the above scheme has little impact on the structure of small-flux water purifiers because the current small-flux water purifiers already have a water tank. However, it has a great impact on large-flux water purifiers because existing large-flux water purifiers usually do not include a water tank, so they have advantages such as small volume and fresh purified water. Setting up a water tank causes large-flux water purifiers to lose the above advantages and also increases their costs, such as additionally setting up a pump, etc. Summary of the Invention

[0005] In order to at least partially solve the problems existing in the prior art, some embodiments of the present invention provide a water purifier. The water purifier has a water inlet and a water intake port, and the water purifier includes: a booster pump and a reverse osmosis filter element. The booster pump is connected between the water inlet and the raw water port of the reverse osmosis filter element, and the purified water port of the reverse osmosis filter element is connected to the water intake port; and a control module, which is used to adjust the working voltage U of the booster pump according to the target purified water flow rate Q at the purified water port of the reverse osmosis filter element, wherein the target purified water flow rate Q is positively correlated with the working voltage U of the booster pump.

[0006] Compared with the existing water purifier that adjusts the purified water flow rate by setting a water tank and a water pump downstream of the reverse osmosis filter element, adjusting the water output flow rate through a booster pump can, on the one hand, simplify the structure of the water purifier, eliminating the need to set up additional water tanks and water pumps and reducing costs. On the other hand, a matching working voltage can be provided to the booster pump according to the target purified water flow rate, so that the purified water outlet of the reverse osmosis filter element outputs purified water at the target purified water flow rate. In this way, there will be no purified water beyond the required range, so there is no need to set up a water tank and a water pump, which can not only ensure the freshness of the water quality and further reduce costs, but also save energy when the target purified water flow rate decreases.

[0007] Exemplarily, the control module adjusts the working voltage U of the booster pump according to the target purified water flow rate Q at the purified water outlet of the reverse osmosis filter element, including performing the following operations: determining the working voltage U of the booster pump according to the target purified water flow rate Q using the following formula: U = aQ + b, where a and b are constants.

[0008] In the above technical solution, by determining the corresponding relationship between the target purified water flow rate Q and the working voltage U of the booster pump, it is not necessary to store a large amount of data in the control module, nor to measure a large amount of data in advance, reducing the workload of design and production, simplifying the design of the control module, and reducing costs. Adjusting the constants in the corresponding relationship according to the service life of the reverse osmosis filter element can make the purified water flow rate output by the water purifier always more accurate and improve the user experience.

[0009] Exemplarily, the water purifier further includes an input module for receiving the water intake information input by the user, and the control module is further configured to determine the target purified water flow rate Q according to the water intake information.

[0010] Thus, the target purified water flow rate Q can be determined according to the water intake information provided by the user to automatically adjust the purified water flow rate and improve the user experience. In addition, when the user provides new water intake information during a water intake period, the purified water flow rate can also be adjusted in real time.

[0011] Exemplarily, the water purifier further includes a hot water pipeline provided with a heating module. The hot water pipeline is connected between the purified water outlet and the water intake port of the reverse osmosis filter element, where the water intake information includes the desired water intake temperature, and the desired water intake temperature is negatively correlated with the target purified water flow rate Q.

[0012] In the above technical solution, it is only necessary to control the operation and non-operation of the heating module, and by controlling the working voltage U of the booster pump, the purified water flow rate is changed to ensure that the temperature of the output hot water is the desired water intake temperature. Such a control scheme is simpler, can provide hot water with a higher temperature for the user, and is not prone to errors.

[0013] Exemplarily, a hot water solenoid valve is further provided on the hot water pipeline; and the water purifier further includes a normal temperature water pipeline, the normal temperature water pipeline and the hot water pipeline are connected in parallel between the purified water outlet and the water intake of the reverse osmosis filter element, a normal temperature water solenoid valve is provided on the normal temperature water pipeline, and the control module is further configured to determine the target purified water flow rate Q according to the water intake information, including performing the following operations: when the expected water intake temperature is lower than or equal to the preset temperature threshold, controlling the normal temperature water solenoid valve to open and the hot water solenoid valve to close, and determining the target purified water flow rate Q as the maximum purified water flow rate achieved when the booster pump operates at the rated voltage; and when the expected water intake temperature is higher than the preset temperature threshold, controlling the hot water solenoid valve to open and the normal temperature water solenoid valve to close, and determining the target purified water flow rate Q according to the expected water intake temperature.

[0014] In the above technical solution, through the hot water solenoid valve and the normal temperature water solenoid valve, it is possible to control the purified water to output normal temperature water at a flow rate not less than the rated flow rate, or to output hot water at a certain flow rate at the expected temperature for the user to use.

[0015] Exemplarily, the water purifier further includes: a first temperature sensor provided on the hot water pipeline and upstream of the heating module, the first temperature sensor is used to detect the inlet water temperature of the heating module, and the control module is further configured to adjust the heating power of the heating module according to the inlet water temperature.

[0016] Exemplarily, the water purifier further includes: a second temperature sensor provided on the hot water pipeline and downstream of the heating module, the second temperature sensor is used to detect the outlet water temperature of the heating module, and the control module is further configured to adjust the heating power of the heating module according to the outlet water temperature.

[0017] In the above technical solution, an instant heating module is adopted, and by adjusting the heating power, the temperature of the output hot water can be adjusted almost without delay. By setting the first temperature sensor, in the case of a change in the inlet water temperature, the control module can compensate the heating power according to the inlet water temperature, so as to output hot water with a more accurate temperature. The second temperature sensor can detect the temperature of the heated hot water, and when the water temperature is higher or lower than the expected water intake temperature, feedback adjustment is performed, and the outlet water temperature of the heating module can also reach the user's expected water intake temperature.

[0018] Exemplarily, the water intake information includes the expected total water intake, and the expected total water intake is positively correlated with the target purified water flow rate Q.

[0019] Therefore, the control module can obtain the user's expected total water intake. When the user's expected total water intake is large, the control module controls the booster pump to operate at a larger working voltage, so as to quickly provide purified water for the user. When the user's water intake is small, the control module can control the booster pump to operate at a smaller working voltage, so as to prevent water overflow or splashing.

[0020] Exemplarily, the water purifier further includes: a flow detector for detecting the actual purified water flow output from the purified water outlet of the reverse osmosis filter element, and the control module is further configured to adjust the working voltage of the booster pump according to the difference between the actual purified water flow and the target purified water flow Q.

[0021] As above, the control module can also recalculate the relationship constants a and b between the current working voltage U of the booster pump and the target purified water flow Q, so as to fit a new relational expression for controlling the working voltage of the booster pump according to the desired water intake flow of the user or the required flow of the heating component.

[0022] Exemplarily, the control module adjusting the working voltage of the booster pump according to the difference between the actual purified water flow and the target purified water flow Q includes performing the following operations: when the absolute value of the difference between the actual purified water flow and the target purified water flow Q is less than a preset difference threshold, adjusting the working voltage of the booster pump according to the difference between the actual purified water flow and the target purified water flow Q to make the actual purified water flow reach the target purified water flow Q; and when the difference between the target purified water flow Q and the actual purified water flow is greater than the preset difference threshold, adjusting the working voltage of the booster pump according to the actual purified water flow.

[0023] The control module can determine whether the water purifier can output the target purified water flow according to the preset difference threshold, and whether the water purifier has a fault or abnormal water source, so as to avoid meaningless voltage adjustment. According to another aspect of the present invention, a control method for a water purifier is provided. The water purifier has a water inlet and a water intake port. The water purifier includes a booster pump and a reverse osmosis filter element. The booster pump is connected between the water inlet and the raw water port of the reverse osmosis filter element, and the purified water port of the reverse osmosis filter element is connected to the water intake port. The control method includes a voltage regulation step: adjusting the working voltage U of the booster pump according to the target purified water flow Q at the purified water port of the reverse osmosis filter element, wherein the target purified water flow Q is positively correlated with the working voltage U of the booster pump.

[0024] Exemplarily, the voltage regulation step specifically includes determining the working voltage U of the booster pump according to the target purified water flow Q by using the following formula: Q = aU + b, where a and b are constants.

[0025] Exemplarily, before the voltage regulation step, the control method further includes: a target purified water flow determination step: receiving the water intake information input by the user and determining the target purified water flow Q according to the water intake information.

[0026] Exemplarily, the water purifier further includes a hot water pipeline, on which a heating module is provided. The hot water pipeline is connected between the purified water port of the reverse osmosis filter element and the water intake port. Among them, the water intake information includes the desired water intake temperature, and the desired water intake temperature is negatively correlated with the target purified water flow Q.

[0027] Exemplarily, a hot water solenoid valve is further provided on the hot water pipeline; and the water purifier further includes a normal temperature water pipeline, the normal temperature water pipeline is connected in parallel with the hot water pipeline between the purified water outlet and the water intake of the reverse osmosis filter element, and a normal temperature water solenoid valve is provided on the normal temperature water pipeline. The step of determining the target purified water flow rate specifically includes: receiving the desired water intake temperature; when the desired water intake temperature is lower than or equal to the preset temperature threshold, controlling the normal temperature water solenoid valve to open and the hot water solenoid valve to close, and determining the target purified water flow rate Q as the maximum purified water flow rate achieved when the booster pump operates at the rated voltage; and when the desired water intake temperature is higher than the preset temperature threshold, controlling the hot water solenoid valve to open and the normal temperature water solenoid valve to close, and determining the target purified water flow rate Q according to the desired water intake temperature.

[0028] Exemplarily, after the voltage regulation step, the control method further includes: detecting the inlet water temperature of the heating module and adjusting the heating power of the heating module according to the inlet water temperature.

[0029] Exemplarily, after the voltage regulation step, the control method further includes: detecting the outlet water temperature of the heating module and adjusting the heating power of the heating module according to the outlet water temperature.

[0030] Exemplarily, the water intake information includes the desired total water intake, and the desired total water intake is positively correlated with the target purified water flow rate Q.

[0031] Exemplarily, after the voltage regulation step, the control method further includes: detecting the actual purified water flow rate output from the purified water outlet of the reverse osmosis filter element; adjusting the working voltage of the booster pump according to the difference between the actual purified water flow rate and the target purified water flow rate Q.

[0032] Exemplarily, the step of adjusting the working voltage of the booster pump according to the difference between the actual purified water flow rate and the target purified water flow rate Q specifically includes: when the absolute value of the difference between the actual purified water flow rate and the target purified water flow rate Q is less than the preset difference threshold, adjusting the working voltage of the booster pump according to the difference between the actual purified water flow rate and the target purified water flow rate Q so that the actual purified water flow rate reaches the target purified water flow rate Q; and when the difference between the target purified water flow rate Q and the actual purified water flow rate is greater than the preset difference threshold, adjusting the working voltage of the booster pump according to the actual purified water flow rate, where the preset difference threshold is greater than the preset difference threshold.

[0033] A series of simplified concepts are introduced in the summary of the invention, which will be further described in detail in the detailed description of the specific implementation part. 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.

[0034] The following will, with reference to the accompanying drawings, detail the advantages and features of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The following drawings of the present application are hereby incorporated as part of the present application for understanding the present application. The embodiments of the present application are shown in the drawings and their descriptions are used to explain the principles of the present application. In the drawings,

[0036] Figure 1A is a water circuit diagram of a water purifier according to an exemplary embodiment of the present invention;

[0037] Figure 1B is according to Figure 1A the mechanical characteristic diagram of the booster pump motor of the shown embodiment;

[0038] Figure 2 is a control flow diagram of a water purifier according to an exemplary embodiment of the present invention;

[0039] Figure 3 is a control flow diagram of partial functions of a water purifier according to an exemplary embodiment of the present invention;

[0040] Figure 4 is a control flow diagram of a water purifier according to another exemplary embodiment of the present invention; and

[0041] Figure 5 is a control flow diagram of partial functions of a water purifier according to an exemplary embodiment of the present invention.

[0042] Among them, the above-mentioned drawings include the following reference numerals:

[0043] 101, water inlet; 102, water intake; 103, concentrated water outlet; 110, booster pump; 120, reverse osmosis filter element; 130, pre-filter element; 140, heating module; 151, inlet water solenoid valve; 152, concentrated water solenoid valve; 153, hot water solenoid valve; 154, normal temperature water solenoid valve; 160, thermostat; 171, first temperature sensor; 172, second temperature sensor; 180, flow detector. Detailed Embodiments

[0044] 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 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.

[0045] 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 specific 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 can also have other embodiments.

[0046] The present invention provides a water purifier. As Figure 1A shown, the water purifier has a water inlet 101 and a water intake 102. The water purifier may include a booster pump 110 and a reverse osmosis filter element 120. The booster pump 110 is connected between the water inlet 101 and the raw water inlet of the reverse osmosis filter element 120, and the purified water outlet of the reverse osmosis filter element 120 is connected to the water intake 102. The aperture of the reverse osmosis filter element 120 is five millionths of a hair (0.0001 microns), which is generally invisible to the naked eye. Bacteria and viruses are 5000 times its size. Therefore, only water molecules and some mineral ions beneficial to the human body can pass through, and other impurities and heavy metals are discharged through the wastewater pipe, providing high-quality purified water for users. The reverse osmosis filter element 120 usually requires a water pressure higher than the tap water pressure during operation, and the tap water pressure usually cannot meet the working requirements of the reverse osmosis filter element 120. Therefore, the raw water can be pressurized by the booster pump 110 so that the water pressure entering the reverse osmosis filter element 120 reaches the working pressure of the reverse osmosis filter element 120 (in the range of about 0.25 - 0.75 MPa). The reverse osmosis filter element 120 also produces concentrated water in a certain proportion when preparing purified water, and the concentrated water can be discharged to the concentrated water outlet 103 of the water purifier via the concentrated water solenoid valve 152. Exemplarily, the water purifier may further include a water inlet solenoid valve 151, and the water inlet solenoid valve 151 may be disposed upstream of the reverse osmosis filter element 120. Since the water inlet 101 is usually connected to municipal tap water, the municipal tap water has a certain pressure. The booster pump 110 usually selects a diaphragm pump, and the diaphragm pump does not have a cut-off function. In other words, when the water purifier is not working and the water at its water inlet 101 has a certain pressure, the water will flow through the booster pump 110. Setting the water inlet solenoid valve 151 can prevent the purified water from flowing out of the water intake 102 or the raw water from flowing out of the concentrated water outlet 103 when the water purifier is not working, thus wasting resources.

[0047] The water purifier may further include a control module, which can be built with electronic components such as a timer, a comparator, a register, a digital logic circuit, etc., or implemented by a processor chip such as a single-chip microcomputer, a microprocessor, a programmable logic controller (PLC), a digital signal processor (DSP), a field programmable gate array (FPGA), a programmable logic array (PLA), an application specific integrated circuit (ASIC) and its peripheral circuits. The control module can be used to adjust the working voltage U of the booster pump 110 according to the target purified water flow rate Q at the purified water outlet of the reverse osmosis filter element 120.

[0048] In the above embodiment, the booster pump 110 is driven by a permanent magnet DC motor. According to the mechanical characteristics of the DC motor, the working voltage U of the DC motor will affect its speed n, and the formula is as follows:

[0049]

[0050] where, the torque of the DC motor is T, CE , C T , Φ N are all related to the inherent properties of the DC motor. As Figure 1B shown, adjusting the working voltage of the DC motor does not affect the hardness of the mechanical characteristics. In other words, as the working voltage of the DC motor increases, at the same torque, its speed almost linearly increases.

[0051] The working current I of the DC motor will affect its torque T. The formula is as follows:

[0052] T = K t Φ Ν Ι

[0053] where K t , Φ N are all related to the inherent properties of the DC motor. Therefore, changing the current of the DC motor mainly affects the torque of the DC motor.

[0054] Based on this, the inventor found that:

[0055] 1) Adjusting the working voltage of the booster pump 110 will directly affect the motor speed of the booster pump 110, and there is a good linear relationship between the two. When the motor speed of the booster pump 110 increases, the water flow rate will also increase. Then, the purified water flow rate of the reverse osmosis filter element 120 will increase, and there is a good linear relationship between the purified water flow rate of the reverse osmosis filter element 120 and the working voltage of the booster pump 110.

[0056] 2) Adjusting the working current of the booster pump 110 will directly affect the motor torque of the booster pump 110, and there is a good linear relationship between the two. When the motor torque of the booster pump 110 increases, although it will also cause an increase in the water flow rate, there is no good linear relationship with the purified water flow rate of the reverse osmosis filter element 120. And the inventor found that when the working voltage of the booster pump 110 remains unchanged, the working current of the booster pump 110 will fluctuate within a certain range. This may be related to the inlet pressure of the booster pump 110. Usually, the municipal water pressure transported by the municipal pipeline is variable, and the working current of the booster pump 110 may be related to the unstable municipal water pressure.

[0057] In summary, by adjusting the working voltage of the booster pump 110, the rotation speed of the booster pump 110 can be controlled, thereby adjusting the output flow rate of the booster pump 110, and further adjusting the purified water flow rate output by the reverse osmosis filter element 120. Moreover, there is a good linear relationship between the working voltage of the booster pump 110 and the purified water flow rate of the reverse osmosis filter element 120. By reasonably selecting the models of the reverse osmosis filter element 120 and the booster pump 110, a better-matched booster pump 110 and reverse osmosis filter element 120 can be selected, making the linearity of the relationship between the target purified water flow rate Q and the working voltage U of the booster pump 110 higher. Exemplarily, the relationship between the working voltage U of the booster pump 110 and the target purified water flow rate Q can be measured under laboratory conditions, and the corresponding data of the two can be obtained and stored in the control module. For example, when the working voltage U of the booster pump 110 is 6V, the target purified water flow rate Q is 400 ml / min; when the working voltage U of the booster pump 110 is 16V, the target purified water flow rate Q is 900 ml / min.

[0058] Exemplarily, the water purifier may further include a pre-filter 130, and the pre-filter 130 may be disposed upstream of the reverse osmosis filter element 120. Exemplarily, the pre-filter 130 may include one or more of an activated carbon filter element, a PP cotton filter element, and a filter element composed of a combination of multiple of them. The pre-filter 130 is located before the reverse osmosis filter element 120 and can perform primary filtration on the water entering the reverse osmosis filter element 120, filtering out impurities with larger particles such as sediment and rust, so as to extend the service life of the reverse osmosis filter element 120.

[0059] Compared with the existing water purifier's solution of adjusting the purified water flow rate by setting a water tank and a water pump downstream of the reverse osmosis filter element 120, adjusting the water output flow rate by the booster pump 110 can, on the one hand, simplify the structure of the water purifier, eliminating the need to set up additional water tanks and water pumps and reducing costs. On the other hand, a matching working voltage can be provided to the booster pump 110 according to the target purified water flow rate, so that the purified water outlet of the reverse osmosis filter element 120 outputs purified water at the target purified water flow rate. In this way, there will be no purified water beyond the required range, so there is no need to set up a water tank and a water pump, which can not only ensure the freshness of the water quality and further reduce costs, but also save energy when the target purified water flow rate decreases.

[0060] Exemplarily, the control module adjusts the working voltage U of the booster pump 110 according to the target purified water flow rate Q at the purified water outlet of the reverse osmosis filter element 120, which may include determining the working voltage U of the booster pump 110 according to the target purified water flow rate Q by using the formula U = aQ + b. a and b are constants. Due to differences in water purifiers, such as different selections of the booster pump 110 and the reverse osmosis filter element 120, and different raw water inlet pressures and other factors, a and b may also be different. Exemplarily, when a booster pump 110 with a larger rated power and the same rated voltage is selected, compared with a booster pump 110 with a smaller rated power, at the same voltage (both booster pumps 110 can work), the flow rate and pressure of the booster pump 110 with a larger power are always greater than those of the booster pump 110 with a smaller power, and the corresponding relationship between the target purified water flow rate Q and the voltage will inevitably be different, and a and b are also different.

[0061] Exemplarily, when the daily water production of the water purifier is 2000 gallons and the rated voltage of the booster pump 110 is 24V, for every 200 ml / min increase in the target purified water flow rate Q, the working voltage U of the booster pump 110 increases by 1V. At this time, a is approximately 0.005 V·min / mL.

[0062] Exemplarily, in Figure 1A In the specific embodiment shown, the water purifier is AR80 with a daily water production of 800 gallons. As described above, the matching degree between the booster pump 110 and the reverse osmosis filter element 120 is good, and the target purified water flow rate Q and the working voltage U of the booster pump 110 are in a linear relationship. The corresponding relationship between the two measured under standard working conditions is as follows in the table. The dynamic pressure of tap water can be 0.2 MPa, the rated voltage of the booster pump 110 of the water purifier can be 24V. When the working voltage U of the booster pump 110 is 6V, the target purified water flow rate Q is 490 ml / min. When the working voltage U of the booster pump 110 is 16V, the target purified water flow rate Q is 1490 ml / min. From this, the proportional coefficient a can be obtained to be approximately 0.01 V·min / mL, and the constant b is approximately 0.11V. From this, it can be considered that for every 100 ml / min increase in the target purified water flow rate Q, the working voltage U of the booster pump 110 increases by 1V.

[0063]

[0064]

[0065] Both a and b can be written into the control module and will not be modified thereafter. In some specific embodiments, a and b may also be changed by the control module itself. Since the reverse osmosis filter element 120, after being used for a period of time, may experience a significant decrease in the purified water flow rate under the same water pressure compared to a new reverse osmosis filter element 120 due to membrane pore rupture or blockage. At this time, it is obviously inappropriate to use the original a and b as the corresponding relationship between the target purified water flow rate Q and the working voltage U of the booster pump 110. Therefore, a timing function can be set in the control module. For example, when the reverse osmosis filter element 120 has been working for more than 100 hours, the values of a and b can be adjusted to conform to the corresponding relationship between the current target purified water flow rate Q of the reverse osmosis filter element 120 and the working voltage U of the booster pump 110.

[0066] Since a relatively large starting voltage is required when the booster pump 110 starts, and too high a voltage may cause damage to the booster pump 110 or water leakage in the pipeline, therefore, the working voltage U of the booster pump 110 cannot be infinitely decreased or increased. Exemplarily, the control module can start the booster pump 110 with a relatively large voltage, such as the rated voltage or 0.5 times the rated voltage, and then reduce the voltage to the voltage corresponding to the target purified water flow rate Q.

[0067] In the above technical solution, by determining the corresponding relationship between the target purified water flow rate Q and the working voltage U of the booster pump 110, it is possible to avoid storing a large amount of data in the control module and also avoid measuring a large amount of data in advance, reducing the workload of design and production, simplifying the design of the control module, and reducing costs. Adjusting the constants in the corresponding relationship according to the usage duration of the reverse osmosis filter element 120 can make the purified water flow rate output by the water purifier always relatively accurate, improving the user experience.

[0068] Exemplarily, the water purifier may further include an input module, and the input module is used to receive the water intake information input by the user. The control module is further used to determine the target purified water flow rate Q according to the water intake information. Exemplarily, the input module may include one or more of a touch screen and buttons, etc. Optionally, the input module may also include a receiver, and the receiver is used to receive the water intake information input by the user through the user operation interface on their electronic device. In short, the input module can be used to receive the water intake information input by the user, generate and send the target purified water flow rate Q to the control module.

[0069] Exemplarily, the water intake information may include the desired water intake volume. For example, when the desired water intake volume set by the user is very small, a lower purified water flow rate is desired, or the initial flow rate is high and the flow rate is low near the end of water intake, so as to be able to accurately control the water intake volume. In the case where the water purifier has a heating function, exemplarily, the water intake information may include the desired water intake temperature. When the desired water intake temperature set by the user is high, the purified water flow rate can be reduced; conversely, when the desired water intake temperature is low, the purified water flow rate can be high. Exemplarily, the water intake information may include the desired water intake flow rate, and the desired water intake flow rate is equal to the target purified water flow rate Q.

[0070] Thus, the target purified water flow rate Q can be determined according to the water intake information provided by the user to automatically adjust the purified water flow rate and improve the user experience. In addition, when the user provides new water intake information during water intake, the purified water flow rate can also be adjusted in real time.

[0071] Exemplarily, the water purifier may further include a hot water pipeline, on which a heating module 140 may be provided, and the hot water pipeline may be connected between the purified water outlet of the reverse osmosis filter element 120 and the water intake port 102. Return to reference Figure 1A , the purified water output by the reverse osmosis filter element 120 can be heated by the heating module 140 on the hot water pipeline and transported to the water intake port 102. Preferably, the heating module 140 is an instant heating module 140. The heating module 140 may include elements such as a thick film heater, an electromagnetic heater, and an electric heating wire to heat the normal temperature purified water passing through the heating module 140. A temperature controller 160 may also be provided on the heating module 140, and the temperature controller 160 can control the temperature of the heating module 140, so as to timely cut off the power supply of the heating module 140 in the case of dry burning of the heating module 140 and prevent damage to the heating module 140.

[0072] The water intake information may include the desired water intake temperature, and the desired water intake temperature is negatively correlated with the target purified water flow rate Q. The rated power of the heating module 140 generally does not exceed 3300W, because for household electricity, the maximum current of the socket generally does not exceed 16A. If the power is too large, it may cause the circuit to heat up and increase the risk of fire. Exemplarily, the rated power of the heating module 140 may be 2200W. If the user's desired water intake temperature is high, the heating module 140 can heat at the rated power. The heating module 140 can heat the water with the rated flow rate to the first temperature at the rated power. When the user's desired water intake temperature is lower than the first temperature, the water purifier cannot provide hot water; when the desired water intake temperature is higher than the first temperature, the higher the desired water intake temperature, the smaller the target purified water flow rate Q, that is, the desired water intake temperature is negatively correlated with the target purified water flow rate Q. The controller can adjust the working voltage U of the booster pump 110 according to the desired water intake temperature when the desired water intake temperature is higher than the first temperature, so that the output water temperature is always within the desired water intake temperature range.

[0073] In the above technical solution, the operation and non-operation of the heating module 140 can be controlled only, and by controlling the working voltage U of the booster pump 110, the purified water flow rate can be changed to ensure that the temperature of the output hot water is the desired water intake temperature. Such a control scheme is simpler, can provide hot water with a higher temperature for users, and is not prone to errors.

[0074] Exemplarily, a hot water solenoid valve 153 may also be provided on the hot water pipeline. The water purifier may further include a normal temperature water pipeline, which is connected in parallel with the hot water pipeline between the purified water outlet and the water intake port 102 of the reverse osmosis filter element 120, and a normal temperature water solenoid valve 154 is provided on the normal temperature water pipeline. Exemplarily, the hot water solenoid valve 153 may be provided at the outlet of the hot water pipeline. When the hot water solenoid valve 153 is closed, it can not only prevent the purified water from flowing out of the hot water pipeline when the user does not take hot water, but also prevent foreign matters such as dust from entering the hot water pipeline. The normal temperature water solenoid valve 154 may also be provided at the outlet of the normal temperature water pipeline. When the normal temperature water solenoid valve 154 is closed, it can prevent the purified water from flowing out of the normal temperature water pipeline when the user takes hot water, and can prevent foreign matters such as dust from entering the normal temperature water pipeline. In an embodiment not shown, the hot water solenoid valve 153 and the normal temperature water solenoid valve 154 may also be provided at any suitable position such as the inlet of the normal temperature water pipeline.

[0075] The control module is further configured to control the normal temperature water solenoid valve 154 to open and the hot water solenoid valve 153 to close when the desired water intake temperature is lower than or equal to the preset temperature threshold, and determine the target purified water flow rate Q as the maximum purified water flow rate achieved when the booster pump 110 operates at the rated voltage.

[0076] In some specific embodiments, the input module of the water purifier may include a touch screen, and the user can input the desired water intake temperature to obtain water at the desired water intake temperature. It can be understood that since the water purifier provided in this application does not have a refrigeration function, the lowest water temperature output by it is the temperature of the purified water output by the reverse osmosis filter element 120. Since the temperature of the purified water output by the reverse osmosis filter element 120 may not be a fixed value due to seasonal changes, when the input water intake temperature is less than or equal to the purified water temperature, the water purifier will output normal temperature water. In some specific embodiments, when the user inputs a water intake temperature lower than the purified water temperature output by the reverse osmosis filter element 120, the water purifier will pop up an error prompt to inform the user of the current lowest water temperature, correct the water intake temperature to the purified water temperature output by the reverse osmosis filter element 120 at this time, and output normal temperature water at the same time. The preset temperature threshold can be the generally recognized normal temperature water temperature preset in the control module, such as 25 °C, or the temperature detected by the water purifier through a sensor, such as the inlet water temperature or the room temperature. The control module can control the normal temperature water solenoid valve 154 to open and the hot water solenoid valve 153 to close, and provide the rated voltage to the booster pump 110. At this time, since the hot water solenoid valve 153 is closed, the purified water can only enter the normal temperature water pipeline from the opened normal temperature water solenoid valve 154, so as to output normal temperature water to the user at a rated flow rate. In an embodiment not shown, when the user takes normal temperature water, a working voltage slightly higher than the rated voltage may also be provided to the booster pump 110. For example, the rated voltage of the booster pump 110 is 24V, and the control module provides 26V voltage to the booster pump 110, so that the output normal temperature water flow rate is greater than the rated flow rate.

[0077] When the desired water intake temperature is higher than the preset temperature threshold, the control module can control the hot water solenoid valve 153 to open and the normal temperature water solenoid valve 154 to close, and determine the target purified water flow rate Q according to the desired water intake temperature.

[0078] As described above, the control module can control the target purified water flow rate Q, and then control the output hot water temperature to make the output hot water temperature meet the desired water intake temperature. At this time, only the hot water solenoid valve 153 can be opened, so that all the purified water enters the hot water pipeline and will not flow out from the normal temperature water pipeline. In the above embodiments, the purified water will only be output through one of the hot water pipeline or the normal temperature water pipeline, and will not be output at the same time. In an embodiment not shown, the hot water solenoid valve 153 and the normal temperature water solenoid valve 154 can be combined into a reversing valve, or the two solenoid valves can be integrated in one valve body. When the reversing valve is energized, the purified water can enter the hot water pipeline or the normal temperature water pipeline selectively through the reversing valve.

[0079] In the above technical solution, through the hot water solenoid valve 153 and the normal temperature water solenoid valve 154, it is possible to control the purified water to output normal temperature water at a flow rate not less than the rated flow rate, or to output hot water at a certain flow rate at the desired temperature for the user to use.

[0080] Exemplarily, the water purifier may further include a first temperature sensor 171 disposed on the hot water pipeline and upstream of the heating module 140. The first temperature sensor 171 is used to detect the inlet water temperature of the heating module 140, and the control module is further configured to adjust the heating power of the heating module 140 according to the inlet water temperature. In Figure 1A In the illustrated embodiment, the heating module 140 may employ an instant heating module 140. The first temperature sensor 171 may be disposed at the water inlet of the heating module 140. Generally, if the water purifier is used indoors, the temperature difference of the normal temperature water is not large in different seasons, and the temperature of the normal temperature water can be considered to be 20 degrees. However, in some cases, the temperature of the normal temperature water produced by the reverse osmosis filter element 120 may change with the seasons. In this case, setting the first temperature sensor 171 can enable the control module to more accurately determine the heating power of the heating module 140, so that the outlet water temperature reaches the user's desired water intake temperature.

[0081] Exemplarily, the water purifier may further include a second temperature sensor 172 disposed on the hot water pipeline and downstream of the heating module 140. The second temperature sensor 172 is used to detect the outlet water temperature of the heating module 140, and the control module is further configured to adjust the heating power of the heating module 140 according to the outlet water temperature. When the outlet water temperature detected by the second temperature sensor 172 is lower than the user's desired water intake temperature, the heating power can be increased; conversely, when the outlet water temperature detected by the second temperature sensor 172 is higher than the user's desired water intake temperature, the heating power can be decreased, so as to accurately control the heating power of the heating module 140.

[0082] The first temperature sensor 171 and the second temperature sensor 172 may also be selectively provided. By setting the first temperature sensor 171 and the second temperature sensor 172, the heating power of the heating module 140 can be accurately determined, so that the outlet water temperature of the heating module 140 reaches the user's desired water intake temperature.

[0083] In the above technical solution, the instant heating module 140 is adopted, and the temperature of the output hot water can be adjusted almost without delay by adjusting the heating power. By setting the first temperature sensor 171, in the case of a change in the inlet water temperature, the control module can compensate the heating power according to the inlet water temperature, so as to output hot water with a relatively accurate temperature. The second temperature sensor 172 can detect the temperature of the heated hot water and perform feedback adjustment when the water temperature is higher or lower than the desired water intake temperature, and similarly, the outlet water temperature of the heating module 140 can reach the user's desired water intake temperature.

[0084] Exemplarily, the water intake information includes the total expected water intake, which is positively correlated with the target purified water flow rate Q. Taking the example of a user taking 100 mL of water, if the water flow rate during water intake is 2 L / min, it only takes 3 seconds to fill a 100 mL container. Since the container is small, it is very likely that the water flow rate is too large and splashes out of the container. Therefore, when the total expected water intake of the user is small, the user usually hopes to use a smaller water flow rate. When the user takes 2 L of water, if the water flow rate is small, the user needs to wait for a long time, and the user experience is poor. Therefore, the control module can obtain the total expected water intake of the user. When the total expected water intake of the user is large, the control module controls the booster pump 110 to work at a higher working voltage, so as to quickly provide purified water for the user. When the water intake of the user is small, the control module can control the booster pump 110 to work at a lower working voltage, so as to prevent water from overflowing or splashing.

[0085] In an embodiment not shown, when the total expected water intake of the user is large, the control device can also control the booster pump 110 to work at a higher working voltage at the beginning to output at a larger flow rate. When the output water volume is close to the total expected water intake, the control device controls the booster pump 110 to work at a lower working voltage to reduce the output flow rate. For example, if the total expected water intake of the user is 1 L, the control module can output purified water at a flow rate of 1 L / min for the first 0.9 L and at a flow rate of 0.1 L / min for the last 0.1 L. This can not only shorten the water intake time of the user but also prevent water from splashing.

[0086] Exemplarily, the water purifier may further include a flow detector 180. The flow detector 180 is used to detect the actual purified water flow rate output from the purified water outlet of the reverse osmosis filter element 120. The control module is further used to adjust the working voltage of the booster pump 110 according to the difference between the actual purified water flow rate and the target purified water flow rate Q. In the above embodiment, the reverse osmosis filter element 120 and the booster pump 110 may have a good matching relationship, that is, there is an excellent linear relationship between the output flow rate of the reverse osmosis filter element 120 and the working voltage of the booster pump 110. As mentioned above, as the use time of the reverse osmosis filter element 120 increases, the output purified water flow rate of the reverse osmosis filter element 120 will decrease under the same inlet water pressure. At this time, the linear relationship between the target purified water flow rate Q and the working voltage of the booster pump 110 may be damaged. Or the user replaces the reverse osmosis filter element 120, resulting in the performance of the reverse osmosis filter element 120 not being fully matched with the performance of the booster pump 110, which will cause the water output flow rate of the water purifier to be different from that before under the same working voltage. Therefore, a flow detector 180 can be set at the purified water outlet of the reverse osmosis filter element 120 to detect the true flow rate of the output purified water in real time or intermittently and feedback the true flow rate to the control module.

[0087] As described above, the control module can also recalculate the relationship constants a and b between the current operating voltage U of the booster pump 110 and the target purified water flow rate Q, so as to fit a new relationship formula for controlling the operating voltage of the booster pump 110 according to the desired water intake flow rate of the user or the required flow rate of the heating component.

[0088] In the above technical solution, by setting the flow detector 180, real flow data can be obtained to feedback-control the operating voltage of the booster pump 110, so that the output purified water flow rate is not easily affected by factors such as the aging or replacement of the reverse osmosis filter element 120, and the flow rate is more accurate.

[0089] Exemplarily, the control module can adjust the operating voltage of the booster pump 110 according to the difference between the actual purified water flow rate and the target purified water flow rate Q. When the absolute value of the difference between the actual purified water flow rate and the target purified water flow rate Q is less than the preset difference threshold, the operating voltage of the booster pump 110 is adjusted according to the difference between the actual purified water flow rate and the target purified water flow rate Q to make the actual purified water flow rate reach the target purified water flow rate Q. Exemplarily, the water purifier can first perform a quick adjustment based on the relationship between the target purified water flow rate Q and the operating voltage of the booster pump 110. Taking the target purified water flow rate Q of 900 mL / min as an example, in the corresponding embodiment in the above table, the control module can provide an operating voltage of 16V for the booster pump 110. When the actual purified water flow rate is less than 900 mL / min, for example, 850 mL / min, the control module increases the operating voltage provided to the booster pump 110 until the output actual purified water flow rate reaches 900 mL / min. At this time, the absolute value of the difference between the actual purified water flow rate and the target purified water flow rate Q is 50 mL / min, which is less than the preset difference threshold. Exemplarily, the preset difference threshold can be 100 mL / min.

[0090] When the difference between the target purified water flow rate Q and the actual purified water flow rate is greater than a preset difference threshold, the working voltage of the booster pump 110 is adjusted according to the actual purified water flow rate. Exemplarily, when there is a pipeline blockage or a water supply cut-off, etc., the flow rate of tap water may decrease significantly at this time. For example, the tap water flow rate is 500 mL / min. When the target purified water flow rate Q is 900 mL / min, no matter how the working voltage of the booster pump 110 is adjusted, it is impossible to make the output actual purified water flow rate reach the target purified water flow rate. At this time, the difference between the target purified water flow rate Q and the actual purified water flow rate is greater than the preset difference threshold. The control module can thus determine that the flow rate of the raw water is abnormal. If the booster pump 110 is driven at a relatively high working voltage, problems such as air entrapment in the booster pump 110 may occur, generating a relatively large noise. Thus, the control module can control the booster pump 110 to work at the working voltage corresponding to the actual purified water flow rate, providing a small amount of purified water for the user. Each time the user takes water, it will first be quickly adjusted through the relationship between the target purified water flow rate Q and the working voltage of the booster pump 110, and the above determination will be made to prevent the water purifier from continuously maintaining a small flow rate state.

[0091] The control module can judge whether the water purifier can output the target purified water flow rate according to the preset difference threshold, as well as whether the water purifier has a fault or the water source is abnormal, thereby avoiding meaningless voltage adjustment.

[0092] On the other hand, the present invention provides a control method for a water purifier. The water purifier can be any of the above water purifiers. As Figure 2 shown, the control method of the water purifier includes:

[0093] Voltage regulation step S220: Adjust the working voltage U of the booster pump according to the target purified water flow rate Q at the purified water outlet of the reverse osmosis filter element, wherein the target purified water flow rate Q is positively correlated with the working voltage U of the booster pump.

[0094] Exemplarily, the voltage regulation step may specifically include determining the working voltage U of the booster pump according to the target purified water flow rate Q by using the following formula:

[0095] U = aQ + b,

[0096] where a and b are constants.

[0097] Exemplarily, before the voltage regulation step, the control method further includes:

[0098] Target purified water flow rate determination step S210: Receive the water-taking information input by the user and determine the target purified water flow rate Q according to the water-taking information.

[0099] Exemplarily, the water purifier further includes a hot water pipeline, on which a heating module is provided, and the hot water pipeline is connected between the purified water outlet and the water intake of the reverse osmosis filter element. In this case, the water intake information includes the desired water intake temperature, and the desired water intake temperature is negatively correlated with the target purified water flow rate Q.

[0100] Exemplarily, a hot water solenoid valve is also provided on the hot water pipeline. The water purifier may further include a normal temperature water pipeline, which is connected in parallel with the hot water pipeline between the purified water outlet and the water intake of the reverse osmosis filter element, and a normal temperature water solenoid valve is provided on the normal temperature water pipeline. As Figure 3 shown, the step S210 of determining the target purified water flow rate specifically includes:

[0101] Execute step S310: Receive the desired water intake temperature;

[0102] Execute step S320: Determine whether the desired water intake temperature is higher than the preset temperature threshold. When the desired water intake temperature is lower than or equal to the preset temperature threshold, execute step S330, control the normal temperature water solenoid valve to open and the hot water solenoid valve to close, and determine the target purified water flow rate Q as the maximum purified water flow rate achieved when the booster pump operates at the rated voltage.

[0103] When the desired water intake temperature is higher than the preset temperature threshold, execute step S340, control the hot water solenoid valve to open and the normal temperature water solenoid valve to close, and execute step S350 to determine the target purified water flow rate Q according to the desired water intake temperature.

[0104] Exemplarily, as Figure 4 shown, after the voltage regulation step S220, the control method may further include:

[0105] Execute step S410: Detect the inlet water temperature of the heating module and adjust the heating power of the heating module according to the inlet water temperature.

[0106] Exemplarily, after the voltage regulation step S220, the control method may further include:

[0107] Execute step S420: Detect the outlet water temperature of the heating module and adjust the heating power of the heating module according to the outlet water temperature.

[0108] Exemplarily, after the voltage regulation step S220, the control method may further include:

[0109] Execute step S430: The water intake information includes the desired total water intake, and the desired total water intake is positively correlated with the target purified water flow rate Q.

[0110] Exemplarily, after the voltage regulation step S220, the control method may further include:

[0111] Execute step S440: Detect the actual purified water flow rate output from the purified water outlet of the reverse osmosis filter element;

[0112] Execute step S450: Adjust the working voltage of the booster pump according to the difference between the actual purified water flow rate and the target purified water flow rate Q.

[0113] After the voltage regulation step S220, any one or several of step S410, step S420, and step S430 may be included. There is no order of execution for steps S410, S420, and S430. Optionally, steps S440 and S450 may also be included after the voltage regulation step S220. Among them, steps S440 and S450 need to exist simultaneously, and step S440 is executed before step S450. It should be noted that the execution of steps S440 - S450 has no order with the aforementioned steps S410 - S430.

[0114] Exemplarily, as Figure 5 shown, step S450 of adjusting the working voltage of the booster pump according to the difference between the actual purified water flow rate and the target purified water flow rate Q specifically includes:

[0115] When the absolute value of the difference between the actual purified water flow rate and the target purified water flow rate Q is less than the preset difference threshold, execute step S451 to adjust the working voltage of the booster pump according to the difference between the actual purified water flow rate and the target purified water flow rate Q, so that the actual purified water flow rate reaches the target purified water flow rate Q;

[0116] When the difference between the target purified water flow rate Q and the actual purified water flow rate is greater than the preset difference threshold, execute step S452 to adjust the working voltage of the booster pump according to the actual purified water flow rate.

[0117] In the description of the present invention, it should be understood that the orientation or positional relationships indicated by orientation words such as "front", "rear", "upper", "lower", "left", "right", "lateral", "vertical", "perpendicular", "horizontal", and "top", "bottom", etc. are usually based on the orientation or positional relationships shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description. Without contrary instructions, 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.

[0118] 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 figures and other components or features. It should be understood that regional relative terms not only include the orientation of the components described in the figures, but also different orientations during use or operation. For example, if the components in the attached drawings are inverted as a whole, then 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 orientations 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.

[0119] 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.

[0120] 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 do not necessarily need to describe a specific order or sequence. It should be understood that the data used in this way 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.

[0121] 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 within 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 claimed by the present invention. The protection scope of the present invention is defined by the appended claims and their equivalent scope.

Claims

1. A water purifier, the water purifier having a water inlet and a water intake, characterized in that: The water purifier comprises: a booster pump and a reverse osmosis filter element, wherein the booster pump is connected between the water inlet and the raw water inlet of the reverse osmosis filter element, and the purified water inlet of the reverse osmosis filter element is connected to the water intake; and A control module, the control module is used to adjust the working voltage U of the booster pump according to the target clean water flow Q of the clean water outlet of the reverse osmosis filter element, wherein the target clean water flow Q is positively correlated with the working voltage U of the booster pump.

2. The water purifier according to claim 1, characterized in that: The control module adjusts the working voltage U of the booster pump according to the target clean water flow Q of the clean water outlet of the reverse osmosis filter element, including performing the following operations: The working voltage U of the booster pump is determined according to the target clean water flow Q using the following formula: U=aQ+b, Among them, a and b are constants.

3. The water purifier according to claim 1, characterized in that: The water purifier further comprises an input module, wherein the input module is used to receive water intake information input by a user. The control module is also used to determine the target purified water flow rate Q according to the water intake information.

4. The water purifier according to claim 3, characterized in that: The water purifier further comprises a hot water pipeline, on which a heating module is arranged, and the hot water pipeline is connected between the water purification port of the reverse osmosis filter element and the water intake port. The water intake information includes an expected water intake temperature, and the expected water intake temperature is negatively correlated with the target clean water flow rate Q.

5. The water purifier according to claim 4, characterized in that: The hot water pipeline is also provided with a hot water solenoid valve; and The water purifier further comprises a normal temperature water pipeline, wherein the normal temperature water pipeline and the hot water pipeline are connected in parallel between the water purification port of the reverse osmosis filter element and the water intake port, and a normal temperature water solenoid valve is arranged on the normal temperature water pipeline. The control module is also used to determine the target purified water flow rate Q according to the water intake information, including performing the following operations: When the expected water intake temperature is lower than or equal to a preset temperature threshold, the normal temperature water solenoid valve is controlled to be opened and the hot water solenoid valve is controlled to be closed, and the target clean water flow rate Q is determined as the maximum clean water flow rate achieved when the booster pump operates at a rated voltage; and When the expected water intake temperature is higher than the preset temperature threshold, the hot water solenoid valve is controlled to open and the normal temperature water solenoid valve is controlled to close, and the target purified water flow rate Q is determined according to the expected water intake temperature.

6. The water purifier according to claim 4, characterized in that: The water purifier also includes: a first temperature sensor disposed on the hot water pipeline and upstream of the heating module, the first temperature sensor being used to detect an inlet water temperature of the heating module, the control module being further used to adjust a heating power of the heating module according to the inlet water temperature; and / or A second temperature sensor is arranged on the hot water pipeline and downstream of the heating module, and the second temperature sensor is used to detect the outlet water temperature of the heating module. The control module is also used to adjust the heating power of the heating module according to the outlet water temperature.

7. The water purifier according to claim 3, characterized in that: The water intake information includes an expected total water intake, and the expected total water intake is positively correlated with the target clean water flow rate Q.

8. The water purifier according to claim 1, characterized in that: The water purifier also includes: A flow detector is used to detect the actual clean water flow output from the clean water outlet of the reverse osmosis filter element. The control module is also used to adjust the working voltage of the boost pump according to the difference between the actual clean water flow and the target clean water flow Q.

9. The water purifier according to claim 8, characterized in that: The control module adjusts the working voltage of the boost pump according to the difference between the actual clean water flow rate and the target clean water flow rate Q, including performing the following operations: When the absolute value of the difference between the actual clean water flow rate and the target clean water flow rate Q is less than a preset difference threshold, adjusting the working voltage of the booster pump according to the difference between the actual clean water flow rate and the target clean water flow rate Q so that the actual clean water flow rate reaches the target clean water flow rate Q; as well as When the difference between the target clean water flow rate Q and the actual clean water flow rate is greater than a preset difference threshold, the operating voltage of the boost pump is adjusted according to the actual clean water flow rate.

10. A control method for a water purifier, the water purifier having a water inlet and a water intake, characterized in that: The water purifier comprises a booster pump and a reverse osmosis filter element, wherein the booster pump is connected between the water inlet and the raw water outlet of the reverse osmosis filter element, and the purified water outlet of the reverse osmosis filter element is connected to the water intake. The control method comprises: Pressure regulating step: adjusting the working voltage U of the booster pump according to the target clean water flow Q of the clean water outlet of the reverse osmosis filter element, wherein the target clean water flow Q is positively correlated with the working voltage U of the booster pump.

11. The control method according to claim 10, characterized in that: The voltage regulation step specifically includes: The working voltage U of the booster pump is determined according to the target clean water flow Q using the following formula: Q=aU+b, Among them, a and b are constants.

12. The control method according to claim 10, characterized in that: The control method further comprises, before the voltage regulating step: The step of determining the target purified water flow rate is as follows: receiving water intake information input by the user, and determining the target purified water flow rate Q according to the water intake information.

13. The control method according to claim 12, characterized in that: The water purifier further comprises a hot water pipeline, on which a heating module is arranged, and the hot water pipeline is connected between the water purification port of the reverse osmosis filter element and the water intake port. The water intake information includes an expected water intake temperature, and the expected water intake temperature is negatively correlated with the target clean water flow rate Q.

14. The control method according to claim 13, characterized in that: The hot water pipeline is also provided with a hot water solenoid valve; and The water purifier further comprises a normal temperature water pipeline, wherein the normal temperature water pipeline and the hot water pipeline are connected in parallel between the water purification port of the reverse osmosis filter element and the water intake port, and a normal temperature water solenoid valve is arranged on the normal temperature water pipeline. The step of determining the target purified water flow rate specifically includes: Receiving the desired water intake temperature; When the expected water intake temperature is lower than or equal to a preset temperature threshold, the normal temperature water solenoid valve is controlled to be opened and the hot water solenoid valve is controlled to be closed, and the target clean water flow rate Q is determined as the maximum clean water flow rate achieved when the booster pump operates at a rated voltage; and When the expected water intake temperature is higher than the preset temperature threshold, the hot water solenoid valve is controlled to open and the normal temperature water solenoid valve is controlled to close, and the target purified water flow rate Q is determined according to the expected water intake temperature.

15. The control method according to claim 13, characterized in that: The control method further comprises, after the voltage regulating step: Detecting the water inlet temperature of the heating module and adjusting the heating power of the heating module according to the water inlet temperature; and / or The outlet water temperature of the heating module is detected, and the heating power of the heating module is adjusted according to the outlet water temperature.

16. The control method according to claim 12, characterized in that: The water intake information includes an expected total water intake, and the expected total water intake is positively correlated with the target clean water flow rate Q.

17. The control method according to claim 10, characterized in that: The control method further comprises, after the voltage regulating step: Detecting the actual clean water flow rate outputted from the clean water outlet of the reverse osmosis filter element; The working voltage of the boost pump is adjusted according to the difference between the actual clean water flow rate and the target clean water flow rate Q.

18. The control method according to claim 17, characterized in that: The step of adjusting the working voltage of the booster pump according to the difference between the actual clean water flow rate and the target clean water flow rate Q specifically includes: When the absolute value of the difference between the actual clean water flow rate and the target clean water flow rate Q is less than a preset difference threshold, adjusting the working voltage of the booster pump according to the difference between the actual clean water flow rate and the target clean water flow rate Q so that the actual clean water flow rate reaches the target clean water flow rate Q; and When the difference between the target clean water flow Q and the actual clean water flow is greater than a preset difference threshold, the working voltage of the boost pump is adjusted according to the actual clean water flow, wherein the preset difference threshold is greater than the preset difference threshold.

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