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 raw water inlet and a purified water outlet, and the water purifier also comprises a water production module, a water tank, a hot tank and a control module; a water inlet of the water production module is connected to the raw water inlet, and a water outlet of the water production module is connected to a water inlet of the water tank and is also connected to a water inlet of the hot tank; a water outlet of the water tank is connected to the purified water outlet through a first waterway, and a water outlet of the hot tank is connected to the purified water outlet through a second waterway; a first pumping device and a second pumping device are respectively arranged on the first water path and the second water path; at least one of the first pumping device and the second pumping device is a flow-adjustable pumping device, and the control module is used for determining the flow of the flow-adjustable pumping device according to the expected water taking temperature. By adjusting the flow of the adjustable pumping device, the proportion of hot water in the hot tank and / or normal-temperature water is adjusted, and mixed water with any water temperature, which is accurate in temperature and lower than the temperature of the hot water in the hot tank, can be obtained.

Description

Technical Field

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

[0002] With the development of the times, water purifiers have been recognized and purchased by most people, and most of the water purifiers on the market now have heating functions and can provide hot water and normal temperature water.

[0003] For small-throughput water purifiers with a daily water output of less than 400 gallons, a water tank and a hot tank are usually provided in the water purifier. A certain amount of water can be stored in both the water tank and the hot tank, and the hot tank can heat the water to a predetermined temperature. When the user needs normal temperature water, he can directly take it from the water tank. When hot water is needed, hot water can be directly taken from the hot tank. The hot water temperature depends on the insulation temperature of the hot tank.

[0004] Although this type of water purifier can provide hot water, the outlet temperature of the hot water cannot be adjusted, resulting in a poor user experience. 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 above-mentioned water purifier has a raw water inlet and a clean water outlet, and also includes: a water production module, the water inlet of the water production module is connected to the raw water inlet; a water tank, the water inlet of the water tank is connected to the water outlet of the water production module, the water outlet of the water tank is connected to the clean water outlet through a first water path, and a first pumping device is provided on the first water path; a hot tank, the water inlet of the hot tank is connected to the water outlet of the water production module, the water outlet of the hot tank is connected to the clean water outlet through a second water path, and a second pumping device is provided on the second water path; and a control module, at least one of the first pumping device and the second pumping device is a flow-adjustable pumping device, and the control module is used to determine the flow rate of the flow-adjustable pumping device according to the desired water intake temperature.

[0006] The present application can provide normal temperature water and hot water respectively by setting a water tank and a hot tank, and by making at least one of the first pumping device for pumping out normal temperature water in the water tank and the second pumping device for pumping out hot water in the hot tank adjustable in flow rate, so that the temperature of the output hot water can be adjusted within a certain range. Moreover, when the user needs normal temperature water, it can be pumped directly from the water tank; when the user needs hot water at a higher temperature, it can be pumped directly from the hot tank. Therefore, the user has greater freedom of choice and can meet more needs of the user. In addition, since the water purifier is provided with a water tank and a hot tank, both of which have a water storage function, this solution of outputting hot water at multiple temperatures can be applicable to large-flux water purifiers, as well as to small-flux water purifiers, and is particularly applicable to small-flux water purifiers.

[0007] Exemplarily, one of the first pumping device and the second pumping device is a flow-adjustable pumping device, and the other of the first pumping device and the second pumping device includes a water pump and a one-way flow-limiting valve connected in series in the direction of water flow. The output flow of the second water pump may fluctuate due to the pressure change of the front or rear water circuit. By setting the second one-way flow-limiting valve, the hot water flow output from the second pipeline can be controlled to be stable, thereby ensuring accurate adjustment of the temperature of the mixed water.

[0008] Exemplarily, the water purifier further includes a third water path, the third water path is connected between the water outlet of the water pump and the purified water outlet, a water outlet solenoid valve is arranged on the third water path, and the control module is used to control the water outlet solenoid valve to open when the water pump is working and the flow-adjustable pumping device is not working. When the user takes normal temperature water, normal temperature water can be output without flow restriction, or hot water at the temperature of the hot tank can be output without flow restriction.

[0009] Exemplarily, the second pumping device is a flow-adjustable pumping device, the clean water outlet includes a first clean water outlet and a second clean water outlet, the first water path and the second water path are connected to the first clean water outlet, the third water path is connected to the second clean water outlet, the first clean water outlet is used to connect to the hot water pipe of the heating faucet, and the second clean water outlet is used to connect to the normal temperature water pipe of the heating faucet.

[0010] The hot water and mixed water output from the second purified water outlet can be heated again through the heating faucet, which can meet the user's demand for water at a higher temperature (such as boiling water). Because the heating faucet has a faster response speed, the water temperature can be quickly adjusted by adjusting the heating power of the heating faucet, and hot water with a precise desired water intake temperature can be output. The power of the heating faucet is limited, and by cooperating with the mixed water, a large flow of hot water can be output. The normal temperature water is separated from the hot water outlet, and the normal temperature water and hot water do not interfere with each other, which can further ensure the accuracy of the water temperature.

[0011] Exemplarily, a flow meter is provided on the waterway where the water pump and the one-way limiting valve are located, and the flow meter is used to detect the flow information of the waterway, and the control module is also used to control the flow of the flow-adjustable pumping device according to the flow information. By providing a flow meter, the problem of inaccurate flow and poor consistency of the water pump can be solved. According to the flow information, the control module can obtain the precise flow of water passing through the one-way limiting valve, thereby controlling the flow of the flow-adjustable pumping device, and making the temperature of the water output from the clean water outlet more accurate.

[0012] Exemplarily, the water purifier also includes a temperature sensor assembly for detecting the temperature in the water circuit. The temperature sensor assembly includes a first temperature sensor arranged on the first water circuit and / or the water tank, a second temperature sensor arranged on the second water circuit and / or the hot tank, and / or a third temperature sensor arranged between the water outlet formed by the first water circuit and the second water circuit in parallel and the clean water outlet. The control module is also used to determine the flow rate of the flow-adjustable pumping device according to the expected water intake temperature and the temperature measured by the temperature sensor assembly. Providing the first temperature sensor can solve the problem that the water temperature may change with the seasons, so that the water outlet temperature reaches the user's expected water intake temperature. The second temperature sensor can accurately determine the temperature of the hot water output from the hot tank to the clean water outlet, and then can accurately determine the flow rate of the adjustable pumping device, so that the water outlet temperature reaches the user's expected water intake temperature.

[0013] Exemplarily, the water inlet of the hot tank is connected to the water outlet of the water tank through a water supply pipeline to connect to the water outlet of the water production module. The hot tank can take water from the water tank as needed, which can make the control logic relatively simple and reduce the number of starts and stops of the water production module.

[0014] Exemplarily, the water tank is located above the hot tank. In this way, the clean water in the water tank can be directly replenished to the hot tank by gravity, which can reduce costs and save space inside the water purifier.

[0015] Exemplarily, a water replenishment solenoid valve is provided on the water replenishment pipeline. By providing the water replenishment solenoid valve, the timing of replenishing water into the hot tank can be controlled as needed, and the water replenishment is more flexible.

[0016] Exemplarily, a water level detection device for detecting the water level in the hot tank is provided on the hot tank, and the water purifier further includes an input device for receiving the user's water extraction operation and generating water extraction information. The control module is used to control the water replenishment solenoid valve to open when the water level in the hot tank is lower than the preset water level lower limit and the user stops extracting water based on the water extraction information, and control the water replenishment solenoid valve to close when the water level in the hot tank reaches the preset water level upper limit. Setting the preset water level lower limit can avoid the second pumping device still being turned on when the water level in the hot tank is lower than the preset water level lower limit, causing the second pumping device to run idle and affecting the service life. The control module controls the water replenishment solenoid valve to close when the user extracts water, so that on the one hand, all the normal temperature water is directly output, or all is mixed with hot water and output, and the total amount will not be reduced due to the water replenishment of the hot tank; on the other hand, it avoids replenishing water to the hot tank, resulting in a decrease in the water temperature in the hot tank, thereby ensuring that the user can get water of a suitable temperature in a short time when extracting water. When the water level in the hot tank is equal to the preset water level lower limit and the user stops extracting water, the water replenishment solenoid valve is controlled to open, so that water can be replenished to the hot tank in time. When the water level in the hot tank reaches the preset water level upper limit, the control module can control the water replenishment solenoid valve to close, which can ensure that there is enough water in the hot tank for users to use, and can also make the water replenishment solenoid valve close in time.

[0017] Exemplarily, the water outlet of the hot tank is located at the bottom of the hot tank, so as to ensure that all the hot water in the hot tank can be taken out as much as possible, thereby providing a larger amount of hot water for the user.

[0018] Exemplarily, the purified water outlet is connected to a heating faucet, and the control module is used to: when the water level in the hot tank is higher than the preset water level lower limit, control the heating faucet to heat at a first power lower than its rated power so that the outlet water temperature of the heating faucet reaches the desired water intake temperature; when the water level in the hot tank is lower than the preset water level lower limit, control the heating faucet to heat at a second power so that the outlet water temperature of the heating faucet reaches the desired water intake temperature, and the second power is greater than the first power and less than or equal to the rated power. The power of the heating faucet can be utilized to a greater extent, the response speed to temperature changes can be improved, and a large flow of hot water or even boiling water can be output.

[0019] Exemplarily, the rated power of the heating faucet is configured to heat the room temperature water pumped by the first pumping device into boiling water. The first pumping device pumps room temperature water at a certain flow rate, and the heating faucet can also ensure that the room temperature water is heated into boiling water.

[0020] Exemplarily, a gravity check valve that can be unidirectionally conducted along the gravity direction is provided on the water supply pipeline. The gravity check valve can automatically and timely supply water to the hot tank and prevent hot water from entering the water tank.

[0021] Exemplarily, the water outlet of the hot tank is located at the upper part of the hot tank, and / or the water inlet of the hot tank is located at the lower part of the hot tank. In order to output as much hot water as possible, the water outlet of the hot tank is arranged at the lower part of the hot tank. The water inlet is arranged at the lower part of the hot tank to prevent normal temperature water and hot water from mixing in the hot tank and then flowing out, or to prevent normal temperature water from flowing out of the water outlet immediately after entering the hot tank.

[0022] Exemplarily, the purified water outlet is connected to a heating faucet, and the control module is used to: control the heating faucet to heat at a heating power lower than its rated power during the start of the water extraction period so that the outlet water temperature of the heating faucet reaches the desired water extraction temperature, and control the heating faucet to adjust the heating power when the heating power of the heating faucet is lower than the rated power during the water extraction period after the start of the water extraction period so that the outlet water temperature of the heating faucet reaches the desired water extraction temperature, and control the flow rate of the flow-adjustable pumping device when the heating power of the heating faucet reaches the rated power so that the outlet water temperature of the heating faucet reaches the desired water extraction temperature. In this way, the power of the heating faucet can be utilized to a greater extent, the response speed to temperature changes can be improved, a large flow of hot water or even boiling water can be output, and the user experience can be improved.

[0023] Exemplarily, the rated power of the heating faucet is configured to be able to heat the normal temperature water pumped by the second pumping device into boiling water to meet the user's demand for the highest water temperature.

[0024] Exemplarily, the hot tank further has an exhaust port disposed at its upper portion and used to communicate with the water tank and / or a drain port disposed at its lower portion. The exhaust port can balance the internal air pressure when the hot tank is filled with water or pumped out of water, preventing normal temperature water from being unable to be injected or hot water from being unable to be pumped out due to negative pressure in the tank. During heating, the generated water vapor can also be discharged through the exhaust port. By providing the drain port, the water in the hot tank can be completely drained when necessary.

[0025] Some other embodiments of the present invention provide a control method, which is applicable to the following water purifier: the water purifier has a raw water inlet and a clean water outlet, and the water purifier also includes: a water production module, the water inlet of the water production module is connected to the raw water inlet; a water tank, the water inlet of the water tank is connected to the water outlet of the water production module, the water outlet of the water tank is connected to the clean water outlet through a first water path, and a first pumping device is provided on the first water path; and a hot tank, the water inlet of the hot tank is connected to the water outlet of the water production module, the water outlet of the hot tank is connected to the clean water outlet through a second water path, and a second pumping device is provided on the second water path, at least one of the first pumping device and the second pumping device is a flow-adjustable pumping device, and the control method includes: determining the flow rate of the flow-adjustable pumping device according to the desired water intake temperature.

[0026] Normal temperature water and hot water can be provided separately, so that the water temperature of the output hot water can be adjusted within a certain range. When the user needs normal temperature water, it can be pumped directly from the water tank; when the user needs hot water at a higher temperature, it can be pumped directly from the hot tank.

[0027] Exemplarily, one of the first pumping device and the second pumping device is a flow-adjustable pumping device, the other of the first pumping device and the second pumping device comprises a water pump and a one-way flow limiting valve sequentially connected in series along the water flow direction, the water purifier further comprises a third water path, the third water path is connected between the water outlet of the water pump and the purified water outlet, and a water outlet solenoid valve is arranged on the third water path,

[0028] The control method also includes:

[0029] When the water pump is working and the flow-adjustable pumping device is not working, the water outlet solenoid valve is controlled to open.

[0030] When the user takes normal temperature water, normal temperature water can be output without flow restriction, or hot water at the temperature of the hot tank can be output without flow restriction.

[0031] Exemplarily, the purified water outlet is connected to a heating faucet, the water inlet of the hot tank is connected to the water outlet of the water tank through a water supply pipeline, so as to be connected to the water outlet of the water production module, and a water supply solenoid valve is arranged on the water supply pipeline. The control method further comprises: when the expected water intake temperature is higher than the water temperature of normal temperature water, operating both the first pumping device and the second pumping device or operating only the second pumping device, so that the outlet water temperature of the purified water outlet is lower than the expected water intake temperature;

[0032] Controlling the heating faucet to heat at a first power lower than the rated power so that the outlet water temperature of the heating faucet reaches the desired water intake temperature until the water level in the hot tank is lower than a preset water level lower limit; and

[0033] The heating faucet is controlled to heat at a second power so that the outlet water temperature of the heating faucet reaches a desired water intake temperature, and the second power is greater than the first power and less than or equal to the rated power.

[0034] The power of the heating faucet can be utilized to the greatest extent, the response speed to temperature changes can be improved, and a larger flow of hot water or even boiling water can be output.

[0035] Exemplarily, the purified water outlet is connected to a heating faucet, the water inlet of the hot tank is connected to the water outlet of the water tank through a water supply pipeline, and then connected to the water outlet of the water production module, and a gravity one-way valve is provided on the water supply pipeline. The control method includes:

[0036] When the expected water intake temperature is higher than the water temperature of normal temperature water, both the first pumping device and the second pumping device are operated or only the second pumping device is operated, so that the outlet water temperature of the purified water outlet is lower than the expected water intake temperature;

[0037] The heating faucet is heated at a heating power lower than its rated power so that the outlet water temperature of the heating faucet reaches the desired water intake temperature;

[0038] Increasing the heating power of the heating faucet to make the outlet water temperature of the heating faucet reach the desired water intake temperature until the heating power of the heating faucet reaches the rated power; and

[0039] Adjusting the flow rate can adjust the flow rate of the pumping device so that the water temperature out of the heating faucet reaches the desired water intake temperature.

[0040] This can maximize the use of the heating faucet power, improve the response speed to temperature changes, output a larger flow of hot water or even boiling water, and enhance the user experience.

[0041] A series of simplified concepts are introduced in the summary of the invention, which will be further described in detail in the detailed description. 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 scope of protection of the claimed technical solution.

[0042] The advantages and features of the present invention are described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] The following drawings of the present invention are used as part of the present invention for understanding the present invention. The drawings show the embodiments of the present invention and their descriptions, and are used to explain the principles of the present invention. In the drawings,

[0044] Figure 1 is a water circuit diagram of a water purifier according to a first exemplary embodiment of the present invention;

[0045] Figure 2 is a water circuit diagram of a water purifier according to a second exemplary embodiment of the present invention;

[0046] Figure 3 is a water circuit diagram of a water purifier according to a third exemplary embodiment of the present invention;

[0047] Figure 4 is a water circuit diagram of a water purifier according to a fourth exemplary embodiment of the present invention;

[0048] Figure 5 is a water circuit diagram of a water purifier according to a fifth exemplary embodiment of the present invention;

[0049] Figure 6 is a water circuit diagram of a water purifier according to a sixth exemplary embodiment of the present invention;

[0050] Figure 7 A curve diagram showing the relationship between the heating faucet power, the hot tank water temperature, and the output flow rate of a water purifier according to an exemplary embodiment of the present invention;

[0051] Figure 8 A curve diagram showing the relationship between the heating faucet power, the hot tank water volume, and the output flow rate of a water purifier according to another exemplary embodiment of the present invention;

[0052] Fig. 9 is a flow chart of a control method for a water purifier according to an exemplary embodiment of the present invention; and

[0053] Fig.10 is a flow chart of a control method for a water purifier according to another exemplary embodiment of the present invention.

[0054] The above drawings include the following reference numerals:

[0055] 100, water purifier; 110, raw water inlet; 120, clean water outlet; 121, first clean water outlet; 122, second clean water outlet; 200, water production module; 210, water inlet of water production module; 220, water outlet of water production module; 300, water tank; 310, water inlet of water tank; 320, water outlet of water tank; 400, 400', first waterway; 410, 410', first pumping device; 411, first water pump; 412, first one-way flow limiting valve; 420, first flow meter; 500, hot tank; 5 10. Water inlet of hot tank; 520. Water outlet of hot tank; 530. Air outlet; 540. Drain outlet; 550. Water level detection device; 600, 600', second water circuit; 610, 610', second pumping device; 611', second water pump; 612', second one-way flow limiting valve; 620, second flow meter; 700, 700', third water circuit; 710, water outlet solenoid valve; 800, water supply pipeline; 810, water supply solenoid valve; 820, gravity one-way valve; 900, ordinary faucet; 910, heating faucet. DETAILED DESCRIPTION

[0056] In the following description, a large amount of details are provided so that the present invention can be thoroughly understood. However, it will be appreciated by those skilled in the art that the following description only exemplarily illustrates a preferred embodiment 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 technical features well known in the art are not described in detail.

[0057] In order to fully 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, but in addition to these detailed descriptions, the present invention may also have other embodiments.

[0058] An embodiment of the present invention provides a water purifier. The water purifier may be a variety of types of water purifiers, including but not limited to a tabletop water purifier or an under-the-sink water purifier, etc. The water purifier according to an embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

[0059] like Figure 1As shown, the water purifier 100 has a raw water inlet 110 and a clean water outlet 120, and also includes a water making module 200, a water tank 300 and a hot tank 500. The water inlet 210 of the water making module 200 is connected to the raw water inlet 110. Exemplarily, the water making module 200 may include a central filter element such as a reverse osmosis filter element, an ultrafiltration filter element, a nanofiltration filter element, or a composite filter element composed of any two or more of them. For the reverse osmosis filter element and the nanofiltration filter element, the water needs to be pressurized before the water enters the filter element. In this case, the water making module 200 may also include a booster pump. Optionally, the water making module 200 may also include a pre-filter element, which is located before the central filter element and is used to perform preliminary filtration on the water entering the central filter element to extend the service life of the central filter element. The reverse osmosis filter element or the nanofiltration filter element will produce a certain proportion of concentrated water during the filtration process, and the concentrated water produced is discharged from the concentrated water outlet.

[0060] The water inlet 310 of the water tank 300 is connected to the water outlet 220 of the water production module 200, and the water outlet 320 of the water tank 300 is connected to the purified water outlet 120 through the first water path 400, and a first pumping device 410 is provided on the first water path 400. Exemplarily but not restrictively, the first pumping device 410 may be a brushless pump, which is used to extract normal temperature water from the water tank 300 and provide pressure therefor, so that the normal temperature water output by the water purifier 100 can be delivered to the user's water intake end, such as a faucet.

[0061] The water inlet 510 of the hot tank 500 is connected to the water outlet 220 of the water production module 200, and the water outlet 520 of the hot tank 500 is connected to the clean water outlet 120 through the second waterway 600. The hot tank 500 is used to heat and store clean water at room temperature. In some embodiments, the hot tank 500 may also have a heat preservation function. A second pumping device 610 is provided on the second waterway 600. It can be understood that the second pumping device 610 can extract hot water in the hot tank 500 and provide pressure for it, so that the hot water output by the water purifier 100 can be delivered to the user's water intake end. At least one of the first pumping device 410 and the second pumping device 610 is a flow adjustable pumping device. In other words, through the above two pumping devices, the flow of normal temperature water output by the water tank 300 can be adjusted, or the flow of hot water output by the hot tank 500 can be adjusted, or the flow of normal temperature water output by the water tank 300 and the flow of hot water output by the hot tank 500 can be adjusted.

[0062] The water purifier 100 also includes a control module. The control module can determine the flow rate of the flow-adjustable pumping device according to the expected water intake temperature. In the case where the clean water outlet 120 is connected to an ordinary faucet 900, the flow rate of the flow-adjustable pumping device is determined according to the expected water intake temperature, so that the temperature of the water output from the clean water outlet 120 is the expected water intake temperature; in the case where the clean water outlet 120 is connected to a heating faucet 910, the flow rate of the flow-adjustable pumping device is determined according to the expected water intake temperature, so that the temperature of the water output from the clean water outlet 120 is lower than the expected water intake temperature, and then the hot water of the expected water intake temperature is heated and output through the heating faucet 910. The expected water intake temperature can be the temperature information input by the user. The input device for receiving the temperature information input by the user can be set at the water intake end of the faucet, for example, or can be set on the water purifier, or can be a user operation interface on a mobile device such as a mobile phone, etc.

[0063] For example, Figure 5-6 As shown, the first pumping device 410 is a flow-adjustable pumping device, and the flow rate of the normal temperature water output from the water tank 300 is adjustable. The control module can determine the normal temperature water flow rate required to output mixed water lower than or equal to the desired water intake temperature according to the water temperature in the hot tank 500 and the water temperature of the normal temperature water, and output normal temperature water of a suitable flow rate by controlling the flow rate of the first pumping device 410'. When the clean water outlet 120 is connected to the ordinary faucet 900, the water temperature of the mixed water can be equal to the desired water intake temperature; when the clean water outlet is connected to the heating faucet 910, the water temperature of the mixed water can be lower than the desired water intake temperature.

[0064] For example, Figure 1-4 As shown, the second pumping device 610 is a flow-adjustable pumping device. In other words, the flow rate of the normal temperature water output from the water tank 300 is constant. The control module can determine the water flow rate of the hot tank 500 required to output mixed water lower than or equal to the desired water intake temperature according to the water temperature in the hot tank 500 and the water temperature of the normal temperature water. By controlling the flow rate of the second pumping device 610, hot water with a suitable flow rate is output, thereby obtaining mixed water with a temperature between the normal temperature and the temperature of the hot water output from the hot tank 500. When the clean water outlet 120 is connected to a common faucet 900, the water temperature of the mixed water can be equal to the desired water intake temperature; when the clean water outlet 120 is connected to a heating faucet 910, the water temperature of the mixed water can be lower than the desired water intake temperature.

[0065] In another embodiment not shown in the figure, the first pumping device and the second pumping device are both flow-adjustable pumping devices. If mixed water with a temperature lower than or equal to the desired water intake temperature is to be output, the output flow rates of the first pumping device and the second pumping device can be adjusted simultaneously. Since the temperature of the mixed water output from the clean water outlet 120 is different when the ordinary faucet 900 and the heating faucet 910 are connected, but the flow rate adjustment of the flow-adjustable pumping device is basically the same, only the case of connecting the ordinary faucet will be described below unless otherwise specified.

[0066] The above-mentioned flow-adjustable pumping device may be a pumping device with a continuously adjustable flow rate, or may be a pumping device with an adjustable flow rate between different gears. In the case where the flow rate is continuously adjustable, the temperature of the output mixed water may be continuously adjustable, so that the temperature of the mixed water output from the clean water outlet 120 can more accurately reach the user's desired water intake temperature. In the case where the flow rate is adjustable between different gears, the temperature of the mixed water output from the clean water outlet 120 may only be adjustable between different gears. The more gears the pumping device with a continuously adjustable flow rate has, the closer the temperature of the mixed water output from the clean water outlet 120 can be to the desired water intake temperature.

[0067] The present application can provide normal temperature water and hot water respectively by setting a water tank 300 and a hot tank 500, and by making at least one of the first pumping device 410 for pumping out normal temperature water in the water tank 300 and the second pumping device 610 for pumping out hot water in the hot tank 500 adjustable in flow rate, so that the water temperature of the output hot water can be adjusted within a certain range. Moreover, when the user needs normal temperature water, it can be pumped directly from the water tank 300; when the user needs hot water at a higher temperature, it can be pumped directly from the hot tank 500. Therefore, the user has greater freedom of choice and can meet more needs of the user. In addition, since the water purifier 100 is provided with a water tank 300 and a hot tank 500, both of which have a water storage function, this solution of outputting hot water of multiple temperatures can be applied to large-flux water purifiers, small-flux water purifiers, and especially small-flux water purifiers.

[0068] For example, when one of the first pumping device 410 and the second pumping device 610 is a flow-adjustable pumping device, the other of the first pumping device 410 and the second pumping device 610 may include a water pump and a one-way flow-limiting valve. The water pump and the one-way flow-limiting valve may be connected in series in sequence along the water flow direction. Figure 1-4In the illustrated embodiment, the second pumping device 610 is a flow-adjustable pumping device, and the first pumping device 410 may include a first water pump 411 and a first one-way limiting valve 412. The first water pump 411 and the first one-way limiting valve 412 are connected in series in sequence along the direction of water flow. In practice, the output flow of the first water pump 411 may fluctuate due to changes in the pressure of the front or rear water circuit, thereby causing the temperature of the mixed water to fluctuate. By setting the first one-way limiting valve 412 downstream of the first water pump 411, the water output by the first water pump 411 can be limited, thereby ensuring that the flow fluctuation of the normal temperature water output by the first water circuit 400 is within an acceptable range, thereby ensuring that the temperature of the mixed water is accurately adjusted. Figure 5-6 In the illustrated embodiment, the first pumping device 410' is a flow-adjustable pumping device, and the second pumping device 610' may include a second water pump 611' and a second one-way limiting valve 612'. The second water pump 611' and the second one-way limiting valve 612' are sequentially connected in series along the water flow direction. As mentioned above, the output flow of the second water pump 611' may fluctuate due to the pressure change of the front or rear water circuit. By setting the second one-way limiting valve 612', the hot water flow output from the second pipeline 600' can be controlled to be stable, thereby ensuring accurate adjustment of the temperature of the mixed water.

[0069] Of course, those skilled in the art may select other methods to make the flow rate of one of the pumping devices constant, and these methods are also within the protection scope of the present application.

[0070] Exemplarily, the water purifier 100 may further include a third water path 700, which is connected between the water outlet of the water pump and the purified water outlet 120. Figure 1-4 In the illustrated embodiment, the third waterway 700 may be connected between the water outlet of the first water pump 411 and the clean water outlet 120. A water outlet solenoid valve 710 may be provided on the third waterway 700. It is understood that the third waterway 700 is in parallel with the first one-way flow limiting valve 412. When the water outlet solenoid valve 710 is closed, the water flow can only be output through the first one-way flow limiting valve 412. When the water outlet solenoid valve 710 is opened, the water flow can be delivered to the clean water outlet 120 through the third waterway 700 without flow restriction, or it can be delivered to the clean water outlet 120 from the first one-way flow limiting valve 412 and the third waterway 700 at the same time, which is related to the opening pressure of the first one-way flow limiting valve 412. When the opening pressure of the first one-way flow limiting valve 412 is high or the water pressure output by the first water pump 411 is high, the water flow may flow to the clean water outlet 120 through the first one-way flow limiting valve 412 and the third waterway 700. The control module is used to control the water outlet solenoid valve 710 to open when the first water pump 411 is working and the flow-adjustable pumping device (ie, the second pumping device 610) is not working.

[0071] Since the first pumping device 410 includes the first water pump 411 and the first one-way limiting valve 412, in other words, the flow rate of the first pumping device 410 is constant. When the user takes hot water, the control module controls the water outlet solenoid valve 710 to close, so that the normal temperature water is mixed with the hot water only through the above-mentioned first one-way limiting valve 412, thereby outputting water with adjustable temperature. Due to the limiting effect of the first one-way limiting valve 412, the first waterway 400 can output normal temperature water with a certain flow rate and constant flow rate. The second pumping device 610 is a flow adjustable pumping device. In this way, the output mixed water temperature can be adjusted to the desired water intake temperature by adjusting the output flow rate of the second pumping device 610. When the user takes normal temperature water, the second pumping device 610 does not work, and the control module can control the water outlet solenoid valve 710 to open. In this way, normal temperature water can be output without limiting the flow rate.

[0072] Specifically, in Figure 5-6 In the illustrated embodiment, the third water path 700' may be connected between the water outlet of the second water pump 611' and the purified water outlet 120. A water outlet solenoid valve 710' may be provided on the third water path 700'. It is understood that the third water path 700' and the second one-way limiting valve 612' are in parallel. When the water outlet solenoid valve 710' is closed, the water flow can only be output through the second one-way limiting valve 612'. When the water outlet solenoid valve 710' is opened, water can be delivered to the clean water outlet 120 through the third water path 700' without flow restriction, or can be delivered to the clean water outlet 120 from the second one-way flow limiting valve 612' and the third water path 700' at the same time, which is related to the opening pressure of the second one-way flow limiting valve 612'. When the opening pressure of the second one-way flow limiting valve 612' is high or the water pressure output by the second water pump 611' is high, water may flow to the clean water outlet 120 through the second one-way flow limiting valve 612' and the third water path 700'. The control module is used to control the water outlet solenoid valve 710' to open when the second water pump 611' is working and the flow adjustable pumping device 410' is not working.

[0073] Since the second pumping device 610' includes a second water pump 611' and a second one-way limiting valve 612', in other words, the flow rate of the second pumping device 610' is constant. When the user takes hot water, the control module controls the water outlet solenoid valve 710' to close, so that the normal temperature water is mixed with the hot water only through the second one-way limiting valve 612', thereby outputting water with adjustable temperature. Due to the limiting effect of the second one-way limiting valve 612', the first waterway 400' can output normal temperature water with a certain flow rate and a constant flow rate. The first pumping device 410' is a flow-adjustable pumping device. In this way, the output mixed water temperature can be adjusted to the desired water intake temperature by adjusting the output flow rate of the first pumping device 410'. When the user takes hot water at the hot tank temperature, the first pumping device 410' does not work, and the control module can control the water outlet solenoid valve 710' to open. In this way, hot water at the hot tank temperature can be output without limiting the flow rate.

[0074] The water purifier provided in the present application can also be used in conjunction with ordinary faucets and heating faucets that do not have a heating function. Ordinary faucets usually have only one water inlet. Some heating faucets only have one water inlet, and the clean water output by the water purifier can be further heated when passing through the heating faucet; some heating faucets have a normal temperature water pipe and a hot water pipe, and a heating body is provided on the hot water pipe, and the heating body is used to heat the water in the hot water pipe. The normal temperature water pipe and the hot water pipe are independent of each other, and they are respectively connected to two water inlets, and can share a water outlet, or each has its own water outlet. In this way, when the user has just finished taking hot water, if he wants to take normal temperature water next, the hot water remaining in the hot water pipe will not be provided to the user. In order to cooperate with this dual-inlet and dual-outlet heating faucet, illustratively, the clean water outlet 120 of the water purifier 100 provided in the present application may include a first clean water outlet 121 and a second clean water outlet 122, such as Figure 3 As shown, the first water path 400 and the second water path 600 are connected to the first clean water outlet 121, and the third water path 700 is connected to the second clean water outlet 122. The first clean water outlet 121 is used to connect to the hot water pipe of the heating faucet 910, and the second clean water outlet 122 is used to connect to the normal temperature water pipe of the heating faucet 910. The hot water flow rate output from the hot tank 500 through the second water path 600 is adjustable, and the normal temperature water flow rate output from the water tank 300 through the first water path 400 is limited by the first one-way limiting valve 412 and is a constant flow rate. The hot water output from the second clean water outlet 122 can be provided only by the hot tank 500 through the second water path 600, or by the first water path 400 and the second water path 600. The normal temperature water can be output from the water tank 300 to the second clean water outlet 122 without limiting the flow rate from the third water path 700, so that the heating faucet 910 can output a large amount of normal temperature water.

[0075] When the water purifier 100 is connected to a heating faucet 910, the hot water and mixed water output from the second water purification outlet 122 can be heated again through the heating faucet 910, so that the user's demand for higher temperature water (such as boiling water) can be met. Similarly, when the water purifier 100 is connected to a heating faucet 910, the normal temperature water flow output from the water tank 300 through the first waterway 400 is limited by the first one-way limiting valve 412, which is a constant flow. The hot water flow output from the hot tank 500 through the second waterway 600 is controlled so that the mixed water temperature reaching the second water purification outlet 122 is slightly lower than the desired water intake temperature. The mixed water is heated again through the heating faucet 910 to reach the user's desired water intake temperature. Because the heating faucet 910 has a faster response speed, the water temperature can be quickly adjusted by adjusting the heating power of the heating faucet 910, and the hot water with the desired water intake temperature with accurate temperature output can be output. The power of the heating faucet 910 is limited, and by cooperating with the mixed water, a large flow of hot water output can also be achieved. The normal temperature water and hot water outlets are separated, and the normal temperature water and hot water do not interfere with each other, which can further ensure the accuracy of water temperature.

[0076] for Figure 1-2 and Figure 5-6 In the embodiment shown, the faucet connected to the clean water outlet 120 may have a heating function. Of course, the faucet may also be an ordinary faucet.

[0077] For example, a flow meter may be provided on the waterway where the water pump and the one-way flow limiting valve are located, and the flow meter is used to detect the flow information of the waterway. The flow information may include the size of the flow in the waterway. Figure 1 As shown, the first water circuit 400 is provided with a first water pump 411 and a first one-way flow limiting valve 412, and a first flow meter 420 may be provided on the first water circuit 400. Figure 5 As shown, a second water pump 611' and a second one-way limiting valve 612' are provided on the second water circuit 600', and a second flow meter 620 can be provided on the second water circuit 600'. The flow rate of the water pump is inaccurate and has poor consistency. Specifically, due to the influence of many factors such as the production process, even water pumps from the same batch have different output flows under the same operating voltage. The above problems are solved by providing a flow meter. According to the flow information, the control module can obtain the precise flow rate of water passing through the one-way limiting valve 412, thereby controlling the flow rate of the flow-adjustable pumping device, so that the temperature of the water output from the clean water outlet 120 can be made more accurate.

[0078] Exemplarily, the water purifier 100 further includes a temperature sensor assembly for detecting the temperature in the water circuit, the temperature sensor assembly includes a first temperature sensor arranged on the first water circuit 400 / 400' and / or the water tank 300, a second temperature sensor arranged on the second water circuit 600 / 600' and / or the hot tank 500, and / or a third temperature sensor arranged between the water outlet formed by the first water circuit 400 / 400' and the second water circuit 600 / 600' in parallel and the purified water outlet 120, a heating faucet water inlet temperature sensor arranged at the water inlet of the heating faucet 910, and a heating faucet water outlet temperature sensor arranged at the water outlet of the heating faucet 910, and the temperature sensor assembly is electrically connected to the control module. The control module is also used to determine the flow rate of the flow-adjustable pumping device according to the desired water intake temperature and the temperature measured by the temperature sensor assembly.

[0079] The first temperature sensor is used to detect the temperature of the normal temperature water output from the water production module 200. Figure 1-4 In the illustrated embodiment, the first temperature sensor may be disposed on the first water path 400 or in the water tank 300. Figure 5-6 In the illustrated embodiment, the first temperature sensor may be disposed on the first water path 400' or in the water tank 300. Generally, if the water purifier is used indoors, the temperature difference of the normal temperature water in different seasons is not large, and the temperature of the normal temperature water may be considered to be 20 degrees. However, in some cases, the temperature of the normal temperature water produced by the water production module 200 may change with the seasons. In this case, the provision of the first temperature sensor may enable the control module to more accurately determine the flow rate of the flow-adjustable pumping device, so that the outlet water temperature reaches the user's desired water intake temperature.

[0080] Normally, the hot tank 500 is used to heat the water therein to a predetermined temperature range. Exemplarily, the water purifier may further include a hot tank temperature sensor for detecting the temperature in the hot tank 500 and generating hot tank temperature information, and the hot tank temperature sensor is electrically connected to the control module. When the water temperature in the hot tank 500 is lower than the lower limit of the predetermined temperature range, the heating component in the hot tank 500 is controlled to start heating. When the water temperature in the hot tank 500 reaches the upper limit of the predetermined temperature range, the heating component is controlled to stop heating. In this way, the temperature of the water in the hot tank 500 can be controlled to be constant within a certain interval range, which can not only prevent the water temperature in the hot tank 500 from being too low, but also avoid the frequent start and stop of the heating component to shorten the service life. Exemplarily, a positive temperature coefficient thermistor (PTC element) for constant temperature heating can be used to directly replace the temperature sensor and the heating component of the split body. The positive temperature coefficient thermistor for constant temperature heating can heat the temperature in the hot tank 500 and keep it at a constant temperature through the element itself, so as to achieve a stable output of hot water in the hot tank 500.

[0081] like Figure 1-4As shown, setting a predetermined temperature range for the hot tank 500 will cause a certain uncertainty in the temperature of the hot water output from the second water circuit 600. Based on this, a second temperature sensor can be provided to detect the temperature of the hot water output from the hot tank 500. The second temperature sensor can be arranged on the second water circuit 600 and / or on the hot tank 500. When the second temperature sensor is arranged on the hot tank 500, the second temperature sensor may include the aforementioned hot tank temperature sensor. By setting the second temperature sensor, the temperature of the hot water output from the hot tank 500 to the clean water outlet 120 can be accurately determined, and then the flow rate of the adjustable pumping device can be accurately determined so that the outlet water temperature reaches the user's desired water intake temperature. Figure 5-6 In the illustrated embodiment, the second temperature sensor may be disposed on the second water path 600 ′ and / or on the hot tank 500 .

[0082] The first temperature sensor and the second temperature sensor can be provided one by one or both according to the need. Of course, the present application does not exclude the embodiment in which no temperature sensor is provided.

[0083] The third temperature sensor is arranged between the water outlets of the first waterway 400 / 400' and the second waterway 600 / 600' and the water outlet 120. The first waterway 400 / 400' and the second waterway 600 / 600' are connected in parallel, and the third temperature sensor is arranged between the water outlets of the first waterway 400 / 400' and the water outlet 120, which can be used to detect the temperature of the mixed water of the first waterway 400 / 400' and the second waterway 600 / 600'. When the temperature of the mixed water is higher than the temperature required for mixing water of the desired water intake temperature (as mentioned above, the temperature is the desired water intake temperature when the clean water outlet 120 is connected to the ordinary faucet 900, and is lower than the desired water intake temperature when the clean water outlet 120 is connected to the heating faucet 910), the hot water flow rate can be reduced or the normal temperature water flow rate can be increased; when the mixed water temperature is lower than the temperature required for mixing water of the desired water intake temperature, the hot water flow rate can be increased or the normal temperature water flow rate can be reduced. When the third temperature sensor is provided, the first temperature sensor and / or the second temperature sensor can be omitted. Of course, the present application does not exclude embodiments that provide a first temperature sensor, a second temperature sensor, and a third temperature sensor.

[0084] For some heating faucets, the heating faucet may have an inlet water temperature sensor and an outlet water temperature sensor, which are respectively arranged in front of and behind the heating body of the heating faucet. The inlet water temperature sensor of the heating faucet is used to detect the inlet water temperature of the heating faucet. In the case of having an inlet water temperature sensor, the third temperature sensor can be omitted. After determining the inlet water temperature of the heating faucet, the control module can determine how much heating power to put into the heating faucet. The outlet water temperature sensor of the heating faucet is used to detect the outlet water temperature of the heating faucet. When the outlet water temperature detected by the outlet water temperature sensor of the heating faucet is lower than the user's expected water intake temperature, the heating power can be increased or the mixed water temperature can be increased; conversely, when the outlet water temperature detected by the outlet water temperature sensor of the heating faucet is higher than the user's expected water intake temperature, the heating power can be reduced or the mixed water temperature can be reduced, thereby accurately controlling the heating power of the heating faucet. Of course, the inlet water temperature sensor of the heating faucet and the outlet water temperature sensor of the heating faucet can be set at one or the other. By setting the inlet water temperature sensor of the heating faucet and / or the outlet water temperature sensor of the heating faucet, the heating power of the heating faucet and the flow rate of the adjustable pumping device can be accurately determined so that the outlet water temperature of the heating faucet reaches the user's expected water intake temperature.

[0085] Exemplarily, the water inlet 510 of the hot tank 500 can be connected to the water outlet 320 of the water tank 300 through the water replenishment pipeline 800, so as to be connected to the water outlet 220 of the water production module 200. The water inlet 510 of the hot tank 500 can be connected to different water outlets 320 than the first waterway 400, and of course, they can also be connected to the same water outlet 320. Clean water can be quickly added to the hot tank 500 through the water tank 300. Optionally, in other embodiments, the water inlet 510 of the hot tank 500 can be directly connected to the water outlet 220 of the water production module 200, so that clean water can be directly provided to the hot tank 500 by the water production module 200. In this case, it is necessary to control when the water production module 200 replenishes water into the water tank 300 and when it replenishes water into the hot tank 500. In the solution where the water tank 300 supplies water to the hot tank 500, the water tank 300 can be filled with water when in standby mode or at any other time, and the water production module 200 usually controls a start and stop once or directly fills the water tank 300 with water without stopping when water is stopped. The hot tank 500 can take water from the water tank 300 as needed, which can make the control logic relatively simple and reduce the number of starts and stops of the water production module 200.

[0086] In some specific embodiments, an additional pumping device is provided between the water tank 300 and the hot tank 500 to pump the water in the water tank 300 into the hot tank 500. In other specific embodiments, the water tank 300 is located above the hot tank 500, so that the purified water in the water tank 300 can be directly replenished to the hot tank 500 by gravity, which can reduce costs and save the internal space of the water purifier 100.

[0087] For example, a water supply solenoid valve 810 may be provided on the water supply pipeline 800. Figure 2 , 4 6. The control module can control the water replenishment solenoid valve 810 to control the opening time of the water replenishment solenoid valve 810 according to the water fetching time of the user after the user stops fetching water, so as to ensure that there is enough water in the hot tank 500. During the period when the user fetches water, the water replenishment solenoid valve 810 can be closed to prevent the temperature of the hot water in the hot tank 500 from decreasing. By setting the water replenishment solenoid valve 810, the timing of water replenishment in the hot tank 500 can be controlled as needed, and water replenishment is more flexible.

[0088] Exemplarily, the water purifier 100 may also include an input device for receiving the user's water extraction operation and generating water extraction information. The input device may be integrated with the aforementioned input device for receiving the temperature information input by the user. The water extraction information may include the user's water extraction start time. Optionally, the water extraction information may also include the user's water extraction stop time or the user's total water extraction amount (e.g., 200ml, 300ml, etc.). Optionally, the water extraction information may also include the user's desired water extraction temperature. In a specific embodiment, the input device may include a touch screen, a button, etc., for the user to input the desired water temperature, and receive instructions for taking normal temperature water / hot water.

[0089] Exemplarily, the hot tank 500 may be provided with a water level detection device 550 for detecting the water level in the hot tank 500. The water level detection device may be any device for detecting the liquid level that is currently available or may appear in the future, such as a float level gauge, an infrared level gauge, an ultrasonic level gauge, or a weighing sensor. The control module is electrically connected to the water level detection device 550. Setting a preset water level lower limit can prevent the second pumping device 610 from still being turned on when the water level in the hot tank 500 is lower than the preset water level lower limit, causing the second pumping device 610 to run idle and affect the service life. The preset water level upper limit can close the water replenishment solenoid valve 810 when the water level in the hot tank 500 is high enough, cut off the water connection between the water tank 300 and the hot tank 500, and prevent the water temperature in the water tank 300 from rising when the hot tank 500 is heated.

[0090] When the water level in the hot tank 500 is lower than the preset water level lower limit and it is determined based on the water intake information that the user stops taking water, the control module can control the water replenishment solenoid valve 810 to open. When the user takes water, in order to ensure the total output of normal temperature water and to ensure that the water temperature in the hot tank 500 is high, the control module can control the water replenishment solenoid valve 810 to close, so that on the one hand, all the normal temperature water is directly output, or all is mixed with hot water and output, and the total amount will not be reduced due to the water replenishment of the hot tank 500. On the other hand, it avoids replenishing water to the hot tank 500, resulting in a decrease in the water temperature in the hot tank 500, thereby ensuring that the user can take water of the appropriate temperature in a short time when taking water. As described above, when the water level in the hot tank 500 reaches the preset water level upper limit, the control module can control the water replenishment solenoid valve 810 to close, which can ensure that there is enough water in the hot tank 500 for the user to take, and can also make the water replenishment solenoid valve 810 close in time.

[0091] For example, in an embodiment where a water replenishment solenoid valve 810 may be provided on the water replenishment pipeline 800, the water outlet 520 of the hot tank 500 may be located at the lower part of the hot tank 500. Due to the provision of the water replenishment solenoid valve 810, the water level in the hot tank 500 may change, and water may be taken from the lower part of the hot tank 500, so that all the hot water in the hot tank 500 may be taken out as much as possible, thereby providing a larger amount of hot water for the user.

[0092] For example, continue to refer to Figure 2 , 4 6, when the water outlet 120 is connected to the heating faucet 910, the control module is used to control the heating faucet 910 to heat at a first power lower than the rated power when the water level in the hot tank 500 is higher than the preset water level lower limit so that the water outlet temperature of the heating faucet 910 reaches the desired water intake temperature. In order to prevent the water in the hot tank 500 from boiling and overflowing, the water in the hot tank 500 is usually heated to a preset temperature below the boiling point or a preset temperature range. Figure 7As shown, during the period 0-t1, the water level in the hot tank 500 is higher than the preset water level lower limit. At this time, the water replenishment solenoid valve 810 is not opened, and the heating faucet 910 can reheat the hot water output from the hot tank 500 with a relatively small first power, and the surplus power can be used for real-time regulation according to the output water temperature. During the period 0-t1, the water temperature in the hot tank 500 remains unchanged, but the water volume gradually decreases. At time t1, the water level in the hot tank 500 is lower than the preset water level lower limit. At this time, the hot tank 500 no longer provides hot water, and only the water tank 300 provides normal temperature water. From time t1, the heating faucet 910 can be controlled to heat with a second power higher than the first power, so that the water outlet temperature of the heating faucet 910 reaches the desired water intake temperature. At this time, the hot water output from the heating faucet 910 is completely heated by the heating faucet 910, so the water outlet flow of the heating faucet 910 decreases sharply from time t1. It can be understood that when the water level in the hot tank 500 is lower than the preset water level lower limit, if the user still needs to take hot water, the normal temperature water from the water tank 300 can only be heated by the heating faucet 910, and the second power used at this time needs to be greater than the first power. When the user takes boiled water, the heating power of the heating faucet 910 (hereinafter referred to as the faucet power) is the largest, and the second power can be its rated power or lower than the rated power. When the user does not take boiled water, the faucet power is lower than the rated power. In other words, when the user takes hot water, when the water level in the hot tank 500 is higher than the preset water level lower limit, the hot water already in the hot tank 500 is preferentially taken, and the heating faucet 910 is only used for compensating heating between the temperature in the hot tank 500 and the desired water intake temperature. When the water level in the hot tank 500 is lower than the preset water level lower limit, the heating faucet 910 is used as the only heat source to provide hot water of the desired temperature. In this way, the faucet power can be utilized to a greater extent, the response speed to temperature changes can be improved, and a large flow of hot water or even boiled water can be output.

[0093] Further, the rated power of the heating faucet 910 is configured to be able to heat the normal temperature water pumped by the first pumping device 410 into boiling water. In different embodiments, there are two situations, the flow of the first pumping device 410 is not adjustable and the flow of the first pumping device 410 is adjustable. When the flow of the first pumping device 410 is not adjustable, the rated power of the heating faucet 910 can just heat the normal temperature water of this flow to boiling water. When the water level in the hot tank 500 is lower than the preset water level lower limit, and hot water is no longer output from the hot tank 500, only a constant flow of normal temperature water is output from the water tank 300, and the heating faucet 910 can also ensure that it is heated into boiling water to meet the needs of users. When the flow of the first pumping device 410 is adjustable, when the water level in the hot tank 500 is lower than the preset water level lower limit, it is still expected to supply water to the clean water outlet 120 at the maximum flow rate. At this time, the first pumping device 410 can pump normal temperature water at a certain flow rate, and the heating faucet 910 can also ensure that the normal temperature water is heated into boiling water. At this time, the flow rate of the first pumping device 410 can be its maximum flow rate, or any value less than the maximum flow rate. The flow rate is directly related to the rated power of the heating faucet 910.

[0094] In another set of embodiments, Figure 1 , 3 As shown in Figure 5, a gravity check valve 820 that can be unidirectionally conducted along the gravity direction is connected between the water outlet 320 of the water tank 300 and the water inlet 510 of the hot tank 500. Exemplarily, a blocking block with a density less than that of water can be arranged in the gravity check valve 820. When the water level in the hot tank 500 reaches the maximum value, the blocking block will cut off the waterway due to the buoyancy effect, preventing the liquid flow between the water tank 300 and the hot tank 500, thereby preventing hot water from entering the water tank 300. When the water level in the hot tank 500 drops, due to the gravity effect, the blocking block drops, and the normal temperature water in the water tank 300 can flow into the hot tank 500. Therefore, the gravity check valve 820 can automatically and timely replenish water into the hot tank 500 and prevent hot water from entering the water tank 300. In some specific embodiments, the gravity check valve 820 can be arranged in series with the water replenishment solenoid valve 810 on the water replenishment pipeline 800.

[0095] Exemplarily, when the gravity check valve 820 is used, the water outlet 520 of the hot tank 500 can be located at the upper part of the hot tank 500. It can be understood that due to the timely water replenishment of the gravity check valve 820, the water in the hot tank 500 is always full, and when the user takes hot water, the water tank 300 will also replenish the hot tank 500 with normal temperature water. According to the relationship between the specific gravity of water and its temperature, the higher the temperature of water is, the upper part of the hot tank 500 is usually located, while the lower the temperature of water is, the lower part of the hot tank 500 is usually located. In order to output as much hot water as possible, the water outlet 520 of the hot tank 500 is set at the lower part of the hot tank 500. Exemplarily, the water inlet 510 of the hot tank 500 can be located at the lower part of the hot tank 500. In order to stabilize the temperature of the hot water output from the hot tank 500 near its water outlet 520, the water inlet 510 is set at the lower part of the hot tank 500 to prevent normal temperature water and hot water from mixing and flowing out of the hot tank 500, or to prevent normal temperature water from flowing out of the water outlet 520 immediately after entering the hot tank 500.

[0096] For the embodiment in which the gravity one-way valve 820 is set, the control module is used to control the heating faucet 910 to heat with a heating power lower than the rated power during the initial water extraction period so that the water outlet temperature of the heating faucet 910 reaches the desired water extraction temperature; and in the water extraction period after the initial water extraction period, when the heating power of the heating faucet 910 is lower than the rated power, control the heating faucet 910 to adjust the heating power so that the water outlet temperature of the heating faucet 910 reaches the desired water extraction temperature; when the heating power of the heating faucet 910 reaches the rated power, control the heating faucet 910 to adjust the water extraction amount so that the water outlet temperature of the heating faucet 910 reaches the desired water extraction temperature.

[0097] like Figure 8 As shown, it can be understood that, since the water tank 300 will replenish water for the hot tank 500 in real time, the water temperature in the hot tank 500 will continue to decrease when the user takes hot water. In the figure, it is shown that the curve of the hot tank water temperature continues to decrease, causing the mixed water temperature to gradually decrease. When it reaches the moment t2', the original hot water in the hot tank 500 is all taken out, and the water taken from the hot tank 500 is actually the normal temperature water from the water tank 300. Therefore, after the moment t2', the water temperature of the hot tank remains unchanged at room temperature. Since the water temperature of the hot tank continues to decrease during the period 0-t2', it is preferred to increase the heating power of the heating faucet 910 (hereinafter referred to as the faucet power). On the one hand, this can ensure a large flow of hot water, and on the other hand, because the heating faucet 910 has a faster response speed, it is preferred to adjust the heating power of the heating faucet 910. When the tap power reaches its rated power at time t1', the tap power cannot be increased any more, and the mixed water temperature continues to decrease. From time t1', the flow rate of the flow-adjustable pumping device can be adjusted to reduce the flow rate of the normal temperature water supplied by the water tank 300 or increase the flow rate of the hot water supplied by the hot tank 500. Specifically, in the case of Figure 1 and3 In the embodiment shown, the flow rate of the first pumping device 410 is not adjustable, so starting from time t1', the second pumping device 610 can be controlled to increase the flow rate to increase the flow rate of hot water in the hot tank 500. When the heating faucet 910 at rated power cannot output water at the desired water intake temperature, the first water pump 411 can be turned off to only draw water from the hot tank 500, and the flow rate of the second pumping device 610 can be adjusted so that the heating faucet 910 can output hot water at the desired water intake temperature without exceeding the rated power. Figure 5 In the illustrated embodiment, the flow rate of the second pumping device 610' is not adjustable, so starting from time t1', the first pumping device 410' can be controlled to reduce the flow rate, thereby reducing the output flow rate of normal temperature water from the water tank 300. When the first pumping device 410' is turned off and only water is taken from the hot tank 500, hot water of the desired water intake temperature can be output under the heating of the heating faucet 910. At this time, the output flow rate gradually decreases to a constant value. In this way, the power of the heating faucet 910 can be utilized to a greater extent, the response speed to temperature changes can be improved, a large flow of hot water or even boiling water can be output, and the user experience can be improved.

[0098] Furthermore, in Figure 1 , 3 In the embodiment shown in 5, since the original hot water in the hot tank 500 is completely taken out starting from time t2', the water taken from the hot tank 500 is actually the normal temperature water from the water tank 300. Therefore, the rated power of the heating faucet 910 can be configured to just heat the normal temperature water of the second pumping device 610 to boiling water to meet the user's demand for the highest water temperature.

[0099] Exemplarily, the hot tank 500 may also have an exhaust port 530 disposed at its upper portion and / or a drain port 540 disposed at its lower portion. The exhaust port 530 is used to communicate with the water tank 300. The exhaust port 530 can balance the internal air pressure when the hot tank 500 is filled with water and pumped out water, preventing the normal temperature water from being unable to be injected or the hot water from being unable to be pumped out due to the negative pressure in the tank. During heating, the generated water vapor can also be discharged through the exhaust port 530. A drain port 540 may also be provided at the lower portion of the hot tank 500. The water in the hot tank 500 can be completely emptied when necessary, for example, when the water purifier 100 needs to be transported or when the water in the hot tank 500 is not used for a long time or when the hot tank 500 needs to be cleaned, the water in the hot tank 500 can be completely emptied through the above-mentioned drain port 540.

[0100] An embodiment of the present invention provides a control method for a water purifier, which is applicable to any of the water purifiers described above. The control method includes determining the flow rate of a flow-adjustable pumping device according to the desired water intake temperature. The flow-adjustable pumping device can be a pumping device with a continuously adjustable flow rate, or a pumping device with an adjustable flow rate between different gears. In the case where the flow rate is continuously adjustable, the output mixed water temperature can be continuously adjustable, so that the temperature of the mixed water output by the clean water outlet 120 can reach the user's desired water intake temperature more accurately. In the case where the flow rate is adjustable between different gears, the mixed water temperature output by the clean water outlet 120 may only be adjustable between different gears. When the gears of the pumping device with a continuously adjustable flow rate are more, the mixed water temperature output by the clean water outlet 120 can be closer to the desired water intake temperature. When the purified water outlet 120 is connected to an ordinary faucet 900, the temperature of the mixed water formed by the normal temperature water output by the first water path 400 / 400' and the hot water output by the second water path 600 / 600' can be equal to the desired water intake temperature; when the purified water outlet 120 is connected to a heating faucet 910, the temperature of the mixed water can be lower than the desired water intake temperature, and the heating faucet 910 will heat the mixed water to the desired water intake temperature again.

[0101] The present application can provide normal temperature water and hot water respectively by setting a water tank 300 and a hot tank 500, and by making at least one of the first pumping device 410 for pumping out normal temperature water in the water tank 300 and the second pumping device 610 for pumping out hot water in the hot tank 500 adjustable in flow rate, so that the water temperature of the output hot water can be adjusted within a certain range. Moreover, when the user needs normal temperature water, it can be pumped directly from the water tank 300; when the user needs hot water at a higher temperature, it can be pumped directly from the hot tank 500. Therefore, the user has greater freedom of choice and can meet more needs of the user. In addition, since the water purifier 100 is provided with a water tank 300 and a hot tank 500, both of which have a water storage function, this solution of outputting hot water of multiple temperatures can be applied to large-flux water purifiers, small-flux water purifiers, and especially small-flux water purifiers.

[0102] In an embodiment in which one of the first pumping device 410 and the second pumping device 610 is a flow-adjustable pumping device, the other of the first pumping device 410 and the second pumping device 610 includes a water pump and a one-way flow limiting valve connected in series along the water flow direction, and a third water circuit 700 is connected between the water outlet of the water pump and the clean water outlet 120, the control method also includes: when the water pump is working and the flow-adjustable pumping device is not working, controlling the water outlet solenoid valve 710 / 710' on the third water circuit 700 / 700' to open.

[0103] It can be understood that in the embodiment where the third water circuit 700 is connected in parallel with the first one-way flow limiting valve 412, the control module is used to control the water outlet solenoid valve 710 to open when the first water pump 411 is working and the second pumping device 610 is not working, so that normal temperature water can be output without flow restriction. In the embodiment where the third water circuit 700' is connected in parallel with the second one-way flow limiting valve 612', when the second water pump 611' is working and the first pumping device 410' is not working, the water outlet solenoid valve 710' is controlled to open, so that hot water at the temperature of the hot tank can be output without flow restriction.

[0104] A heating faucet 910 is connected to the purified water outlet 120, and the water inlet 510 of the hot tank 500 is connected to the water outlet 320 of the water tank 300 through a water supply pipeline 800, so as to be connected to the water outlet 220 of the water production module 200. In an embodiment where a water supply solenoid valve 810 is provided on the water supply pipeline 800, as shown in FIG. Fig. 9 As shown, the control method also includes:

[0105] Step S1: when the expected water intake temperature is higher than the water temperature of normal temperature water, both the first pumping device 410 and the second pumping device 610 are operated or only the second pumping device 610 is operated, so that the outlet water temperature of the purified water outlet 120 is lower than the expected water intake temperature;

[0106] Step S2: Control the heating faucet 910 to heat at a first power lower than its rated power so that the outlet water temperature of the heating faucet 910 reaches the desired water intake temperature until the water level in the hot tank 500 is lower than the preset water level lower limit; and

[0107] Step S3: Control the heating faucet 910 to heat with a second power so that the outlet water temperature of the heating faucet 910 reaches the desired water intake temperature, and the second power is greater than the first power and less than or equal to the rated power.

[0108] In order to ensure that the user can take boiled water at a large flow rate, the first operation S1 is performed. When the expected water intake temperature is relatively low but still higher than the normal temperature water, both the first pumping device 410 and the second pumping device 610 can be operated; when the expected water intake temperature is relatively high (for example, higher than the hot tank temperature), only the second pumping device 610 can be operated to output hot water with a higher temperature to the heating faucet 910, so that hot water with the largest flow rate can be provided. When the water level in the hot tank 500 is higher than the preset water level lower limit, the second operation S2 is performed to reheat the hot water output by the hot tank 500 with a relatively small first power, and the surplus power can be used for real-time regulation according to the actual water outlet temperature. When the water level in the hot tank 500 is lower than the preset water level lower limit, the third operation S3 is performed to control the heating faucet 910 to heat with a second power greater than the first power, so that the water outlet temperature of the heating faucet 910 reaches the expected water intake temperature. In other words, when the user takes hot water, when the water level in the hot tank 500 is higher than the preset water level lower limit, the hot water in the hot tank 500 is used first, and the heating faucet 910 is only used to compensate for heating between the temperature in the hot tank 500 and the desired water temperature. When the water level in the hot tank 500 is lower than the preset water level lower limit, the heating faucet 910 provides hot water at the desired temperature as the only heat source. In this way, the power of the heating faucet 910 can be utilized to a greater extent, the response speed to temperature changes can be improved, and a large flow of hot water or even boiling water can be output.

[0109] A heating faucet 910 is connected to the purified water outlet 120, and the water inlet 510 of the hot tank 500 is connected to the water outlet 320 of the water tank 300 through a water supply pipeline 800, so as to be connected to the water outlet 220 of the water production module 200. In an embodiment where a gravity check valve 820 is provided on the water supply pipeline 800, as shown in FIG. Fig.10 As shown, the control method includes:

[0110] Step S1': when the expected water intake temperature is higher than the water temperature of normal temperature water, both the first pumping device 410 and the second pumping device 610 are operated or only the second pumping device 610 is operated, so that the outlet water temperature of the purified water outlet 120 is lower than the expected water intake temperature;

[0111] Step S2': heating the heating faucet 910 at a heating power lower than its rated power so that the outlet water temperature of the heating faucet 910 reaches the desired water intake temperature;

[0112] Step S3': increasing the heating power of the heating faucet 910 so that the outlet water temperature of the heating faucet 910 reaches the desired water intake temperature, until the heating power of the heating faucet 910 reaches the rated power; and

[0113] Step S4 ′: Adjusting the flow rate The flow rate of the pumping device can be adjusted to make the outlet water temperature of the heating faucet 910 reach the desired water intake temperature.

[0114] Execute step S1', the control module controls the first pumping device 410 and the second pumping device 610 to output a mixed water lower than the expected water intake temperature. When the expected water intake temperature is relatively low but still higher than the normal temperature water, both the first pumping device 410 and the second pumping device 610 can be operated; when the expected water intake temperature is relatively high (for example, higher than the hot tank temperature), only the second pumping device 610 can be operated to output hot water with a higher temperature to the heating faucet 910, so that hot water with the largest flow rate can be provided. Then execute step S2', and heat the heating faucet 910 with a heating power lower than its rated power so that the water outlet temperature of the heating faucet 910 reaches the expected water intake temperature. Since the hot water in the water tank 300 can be replenished into the hot tank 500 at any time through the gravity one-way valve 820, the water temperature in the hot tank 500 will decrease. If the water outlet flow rate is not reduced, the temperature of the mixed water will gradually decrease. Then execute step S3', gradually increase the heating power of the heating faucet 910 until the heating faucet 910 works at the rated power. Then execute step S4', for Figure 5-6 In the embodiment shown, the flow rate of the first pumping device 410' can be adjusted to reduce the flow rate of the normal temperature water, or Figure 1-4 In the embodiment shown, when the flow rate of the second pumping device 610 is adjustable, the flow rate of hot water in the hot tank 500 can be increased. In this way, the power of the heating faucet 910 can be utilized to a greater extent, the response speed to temperature changes can be improved, a larger flow rate of hot water or even boiling water can be output, and the user experience can be improved.

[0115] When the expected water intake temperature is lower than or equal to the temperature of normal temperature water, only the first pumping device is controlled to operate.

[0116] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by directional words such as "front", "back", "up", "down", "left", "right", "lateral", "vertical", "vertical", "horizontal", "top", "bottom", etc. is usually based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the scope of protection of the present invention; the directional words "inside" and "outside" refer to the inside and outside relative to the contour of each component itself.

[0117] For ease of description, regional relative terms such as "above", "above", "on the upper surface of", "above", etc. may 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 include not only the orientation of the components as described in the figure, but also different orientations in use or operation. For example, if the components in the accompanying drawings are inverted as a whole, the components "above other components or features" or "above other components or features" will include the situation where the components are "below other components or structures" or "below other components or structures". Therefore, the exemplary term "above" may include both "above" and "below". In addition, these components or features may also be positioned at other different angles (e.g., rotated 90 degrees or other angles), and this article is intended to include all of these situations.

[0118] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, parts, components and / or combinations thereof.

[0119] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein.

[0120] The present invention has been described by the above embodiments, but it should be understood that the above embodiments are only for the purpose of example and description, and are not intended to limit the present invention to the scope of the described embodiments. In addition, it can be understood by those skilled in the art 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 the protection claimed by the present invention. The protection scope of the present invention is defined by the attached claims and their equivalents.

Claims

1. A water purifier having a raw water inlet and a purified water outlet, characterized in that: The water purifier comprises: A water production module, wherein the water inlet of the water production module is connected to the raw water inlet; A water tank, wherein the water inlet of the water tank is connected to the water outlet of the water production module, and the water outlet of the water tank is connected to the purified water outlet through a first water path, wherein a first pumping device is provided on the first water path; a hot tank, wherein the water inlet of the hot tank is connected to the water outlet of the water production module, the water outlet of the hot tank is connected to the clean water outlet through a second water path, and a second pumping device is provided on the second water path; and A control module, wherein at least one of the first pumping device and the second pumping device is a flow-adjustable pumping device, and the control module is used to determine the flow rate of the flow-adjustable pumping device according to a desired water intake temperature.

2. The water purifier according to claim 1, characterized in that: One of the first pumping device and the second pumping device is a flow-adjustable pumping device, and the other of the first pumping device and the second pumping device includes a water pump and a one-way flow limiting valve which are sequentially connected in series along the water flow direction.

3. The water purifier according to claim 2, characterized in that: The water purifier also includes a third water circuit, which is connected between the water outlet of the water pump and the purified water outlet. A water outlet solenoid valve is arranged on the third water circuit. The control module is used to control the water outlet solenoid valve to open when the water pump is working and the flow-adjustable pumping device is not working.

4. The water purifier according to claim 3, characterized in that: The second pumping device is the flow-adjustable pumping device, The clean water outlet includes a first clean water outlet and a second clean water outlet, the first water path and the second water path are connected to the first clean water outlet, the third water path is connected to the second clean water outlet, the first clean water outlet is used to connect to the hot water pipe of the heating faucet, and the second clean water outlet is used to connect to the normal temperature water pipe of the heating faucet.

5. The water purifier according to claim 2, characterized in that: A flow meter is provided on the waterway where the water pump and the one-way flow limiting valve are located. The flow meter is used to detect flow information of the waterway. The control module is also used to control the flow of the flow-adjustable pumping device according to the flow information.

6. The water purifier according to claim 1, characterized in that: The water purifier also includes a temperature sensor assembly for detecting the temperature in the water path. The temperature sensor assembly includes a first temperature sensor disposed on the first water circuit and / or the water tank, a second temperature sensor disposed on the second water circuit and / or the hot tank, and / or a third temperature sensor disposed between a water outlet formed by the first water circuit and the second water circuit being connected in parallel and the clean water outlet. The control module is further configured to determine the flow rate of the flow-adjustable pumping device according to the desired water intake temperature and the temperature measured by the temperature sensor assembly.

7. The water purifier according to claim 1, characterized in that: The water inlet of the hot tank is connected to the water outlet of the water tank through a water supply pipeline, so as to be connected to the water outlet of the water production module.

8. The water purifier according to claim 7, characterized in that: The water tank is located above the hot tank.

9. The water purifier according to claim 8, characterized in that: A water replenishment solenoid valve is arranged on the water replenishment pipeline.

10. The water purifier according to claim 9, characterized in that: The hot tank is provided with a water level detection device for detecting the water level in the hot tank, and the water purifier further comprises an input device for receiving a user's water extraction operation and generating water extraction information. The control module is used to control the water replenishment solenoid valve to open when the water level in the hot tank is lower than the preset water level lower limit and it is determined based on the water intake information that the user stops taking water, and to control the water replenishment solenoid valve to close when the water level in the hot tank reaches the preset water level upper limit.

11. The water purifier according to claim 9, characterized in that: The water outlet of the hot tank is located at the lower part of the hot tank.

12. The water purifier according to claim 9, characterized in that: The purified water outlet is connected to a heating faucet, and the control module is used to: when the water level in the hot tank is higher than a preset water level lower limit, control the heating faucet to heat at a first power lower than its rated power so that the water outlet temperature of the heating faucet reaches the desired water intake temperature; when the water level in the hot tank is lower than the preset water level lower limit, control the heating faucet to heat at a second power so that the water outlet temperature of the heating faucet reaches the desired water intake temperature, and the second power is greater than the first power and less than or equal to the rated power.

13. The water purifier according to claim 12, characterized in that: The rated power is configured to be capable of heating the normal-temperature water pumped by the first pumping device into boiling water.

14. The water purifier according to claim 8, characterized in that: The water supply pipeline is provided with a gravity one-way valve which can conduct water in one direction along the gravity direction.

15. The water purifier according to claim 14, characterized in that The water outlet of the hot tank is located at the upper part of the hot tank, and / or the water inlet of the hot tank is located at the lower part of the hot tank.

16. The water purifier according to claim 14, characterized in that The purified water outlet is connected to a heating faucet, and the control module is used to: control the heating faucet to heat with a heating power lower than its rated power during a water extraction period so that the outlet water temperature of the heating faucet reaches the desired water extraction temperature; and control the heating faucet to adjust the heating power during a water extraction period after the water extraction period when the heating power of the heating faucet is lower than the rated power so that the outlet water temperature of the heating faucet reaches the desired water extraction temperature; and control the flow rate of the flow-adjustable pumping device when the heating power of the heating faucet reaches the rated power so that the outlet water temperature of the heating faucet reaches the desired water extraction temperature.

17. The water purifier according to claim 16, characterized in that The rated power is configured to be able to heat the normal-temperature water pumped by the second pumping device into boiling water.

18. The water purifier according to claim 1, characterized in that: The hot tank also has an exhaust port disposed at its upper portion and used for communicating with the water tank and / or a drain port disposed at its lower portion.

19. A control method for a water purifier, characterized in that: The water purifier has a raw water inlet and a purified water outlet, and the water purifier comprises: A water production module, wherein the water inlet of the water production module is connected to the raw water inlet; a water tank, wherein the water inlet of the water tank is connected to the water outlet of the water production module, the water outlet of the water tank is connected to the purified water outlet through a first water path, and a first pumping device is provided on the first water path; and A hot tank, the water inlet of the hot tank is connected to the water outlet of the water production module, the water outlet of the hot tank is connected to the clean water outlet through a second water path, a second pumping device is provided on the second water path, at least one of the first pumping device and the second pumping device is a flow-adjustable pumping device, The control method comprises: The flow rate of the pumping device can be adjusted by determining the flow rate according to the expected water intake temperature.

20. The control method according to claim 19, characterized in that: One of the first pumping device and the second pumping device is a flow-adjustable pumping device, and the other of the first pumping device and the second pumping device comprises a water pump and a one-way flow limiting valve connected in series in a water flow direction. The water purifier further comprises a third water path, the third water path being connected between the water outlet of the water pump and the purified water outlet, and a water outlet solenoid valve being arranged on the third water path. The control method further comprises: When the water pump is working and the flow-adjustable pumping device is not working, the water outlet solenoid valve is controlled to open.

21. The control method according to claim 19, characterized in that: The purified water outlet is connected to a heating faucet, the water inlet of the hot tank is connected to the water outlet of the water tank through a water supply pipeline, so as to be connected to the water outlet of the water production module, and the water supply solenoid valve is arranged on the water supply pipeline. The control method further comprises: When the expected water intake temperature is higher than the water temperature of normal temperature water, both the first pumping device and the second pumping device are operated or only the second pumping device is operated, so that the outlet water temperature of the purified water outlet is lower than the expected water intake temperature; Controlling the heating faucet to heat at a first power lower than its rated power so that the outlet water temperature of the heating faucet reaches the desired water intake temperature until the water level in the hot tank is lower than a preset water level lower limit; and The heating faucet is controlled to heat at a second power so that the outlet water temperature of the heating faucet reaches the desired water intake temperature, and the second power is greater than the first power and less than or equal to the rated power.

22. The control method according to claim 19, characterized in that: The purified water outlet is connected to a heating faucet, the water inlet of the hot tank is connected to the water outlet of the water tank through a water supply pipeline, and then connected to the water outlet of the water production module, and a gravity one-way valve is arranged on the water supply pipeline. The control method comprises: When the expected water intake temperature is higher than the water temperature of normal temperature water, both the first pumping device and the second pumping device are operated or only the second pumping device is operated, so that the outlet water temperature of the purified water outlet is lower than the expected water intake temperature; The heating faucet is heated at a heating power lower than its rated power so that the outlet water temperature of the heating faucet reaches the desired water intake temperature; Increasing the heating power of the heating faucet so that the outlet water temperature of the heating faucet reaches the desired water intake temperature, until the heating power of the heating faucet reaches the rated power; and Adjusting the flow rate can adjust the flow rate of the pumping device so that the water outlet temperature of the heating faucet reaches the desired water intake temperature.

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