Water Purifier

Abstract

The present application provides a water purifier, having a raw water inlet, a hot water outlet and a drain outlet, including a booster pump, a filter device, a hot water pipeline and a heater. The water inlet of the booster pump is connected to the raw water inlet. The filter device includes a raw water inlet and a clean water outlet. The water outlet of the booster pump is connected to the raw water inlet of the filter device. The hot water pipeline is connected between the clean water outlet and the water intake of the filter device, and a pumping pump is arranged on the hot water pipeline. The heater is used to heat the water in the hot water pipeline, wherein the booster pump is configured to perform a shut-down operation in response to the user's stop taking hot water, and the pumping pump is configured to shut down after the booster pump performs the shut-down operation. The booster pump continues to work when the user takes hot water, and the water in the filter device will have a higher water pressure. Therefore, the pumping pump on the hot water pipeline can be shut down after the booster pump performs the shut-down operation. In this way, the pressure in the filter device can be released, and the water in the pipeline is prevented from leaking through the water intake under the action of pressure.

Description

Technical Field

[0001] The utility model relates to the technical field of water treatment, in particular to a water purifier. Background Art

[0002] Reverse osmosis membrane filter is a process that uses a pressure higher than the osmotic pressure as a driving force, and utilizes the selective permeability of the selective membrane that can only pass water but not solutes to separate water molecules from solutes in the water body. In order to achieve the pressure required for reverse osmosis, water purifiers using reverse osmosis membrane filters often need to be equipped with a booster pump for boosting pressure. The membrane pore size of the reverse osmosis membrane is very small, so it can effectively remove dissolved salts, colloids, microorganisms, organic matter, etc. in the water. In addition, the reverse osmosis membrane filter will directly discharge the filtered impurities in the form of concentrated water.

[0003] Many common reverse osmosis water purifiers on the market are already equipped with a heating function. Such water purifiers are usually connected to a smart faucet that displays the water temperature. Users can choose hot water or room temperature water on the smart faucet, and can set the hot water temperature. A water purifier equipped with a smart faucet may include a pump and a heater. The pump can adjust the water flow delivered to the heater, thereby adjusting the water pressure delivered to the smart faucet. When water extraction stops, both the booster pump and the pump are turned off, so the water supply to the smart faucet can be stopped.

[0004] However, users reported that after using the water purifier to take hot water, water continued to leak out of the water inlet. This not only wastes water resources, but the high-temperature hot water may also affect objects around the water purifier. Leakage may also cause scalding of users. Utility Model Content

[0005] In order to at least partially solve the problems existing in the prior art, the utility model provides a water purifier having a raw water inlet, a hot water outlet and a drain outlet, and the water purifier includes a booster pump, a filter device, a hot water pipeline and a heater. The water inlet of the booster pump is connected to the raw water inlet. The filter device includes a raw water inlet and a clean water outlet. The water outlet of the booster pump is connected to the raw water inlet of the filter device. The hot water pipeline is connected between the clean water outlet and the water intake of the filter device, and a water pump is provided on the hot water pipeline. The heater is used to heat the water in the hot water pipeline, wherein the booster pump is configured to perform a shut-down operation in response to a user's stop of taking hot water, and the water pump is configured to shut down after the booster pump performs the shut-down operation.

[0006] Since the booster pump continues to work when the user takes hot water, the water in the filter device will have a higher water pressure. After the booster pump stops working, this part of the water pressure will not be released immediately. Therefore, the accumulated pressure will be slowly released through the hot water pipeline, which will cause the water intake of the water purifier to leak. The inventor has proposed a new design, which can set the water pump on the hot water pipeline to be turned off after the booster pump performs the shutdown operation. In other words, the water pump is delayed for a period of time after the booster pump stops working before shutting down, thereby releasing the pressure in the filter device and preventing the residual water in the pipeline from slowly and continuously leaking out through the water intake under the action of pressure. In addition, it also prevents high-pressure water from always existing inside the filter device and the hot water pipeline after the user finishes taking hot water, thereby extending the service life of the water purifier.

[0007] Exemplarily, the water purifier further includes a controller, which is electrically connected to the booster pump and the water pump. The controller is used to control the water pump to shut down after a first preset time period after the booster pump performs a shutdown operation. The controller can accurately control the time for the water pump to delay shutting down, so that when the water pump stops working, the pressure in the filter device can be released to a point where it will not cause water leakage at the water inlet.

[0008] Exemplarily, the water purifier also includes a flow meter and a controller, and the flow meter is used to detect the water flow in the hot water pipeline. The controller is electrically connected to the flow meter, the booster pump and the water pump. The controller is used to control the water pump to shut down after the booster pump performs a shutdown operation and when the water flow is less than a preset flow threshold. The preset flow threshold can be the flow rate of the water pump when extracting pressure-free water. When the flow rate detected by the flow meter is less than the preset flow threshold, it can be said that the water pump has completely released the water pressure of the filter device. At this time, the controller controls the water pump to shut down, achieving a better leak-proof effect.

[0009] Exemplarily, the filter device further includes a concentrate outlet, the water purifier further includes a drain outlet and a concentrate solenoid valve, and the concentrate solenoid valve is connected between the concentrate outlet and the drain outlet. The controller is also used to control the concentrate solenoid valve to open for a second preset time period and then close when the booster pump performs a shutdown operation. After the concentrate solenoid valve is opened, the pressure accumulated in the filter device (especially the pressure before the membrane) can be quickly discharged. It can be avoided that the accumulated pressure causes the concentrate to flow out slowly from the wastewater ratio valve, generating continuous noise for a long time.

[0010] Exemplarily, the water purifier also includes a water inlet solenoid valve, which is connected between the boost pump and the raw water inlet. The controller is also used to control the water inlet solenoid valve to close in response to stopping the hot water extraction operation. Since the raw water inlet can be connected to municipal tap water, the municipal tap water has a certain pressure. When the filter device adopts a filter element such as a reverse osmosis filter element or a nanofiltration filter element, since such a filter element has a concentrated water outlet, even when the boost pump is turned off, tap water will pass through the boost pump and be discharged from the concentrated water outlet of the filter device. The controller can control the water inlet solenoid valve to close when the boost pump stops working, thereby cutting off the water source. Such a setting can avoid the waste of resources caused by the raw water flowing out of the drain when the water purifier is not working.

[0011] Exemplarily, the flow rate of the water pump is adjustable, and the controller is also used to adjust the flow rate of the water pump based on the target hot water temperature input by the user. The water purifier also includes a reflux pipeline, the water inlet of the reflux pipeline is connected to the inlet of the hot water pipeline, the outlet of the reflux pipeline is connected to the inlet of the booster pump, and a check valve is arranged on the reflux pipeline. When the water flow rate at the clean water outlet of the filter device is greater than the water output pumped by the flow control pump, the excess clean water is returned to the upstream of the booster pump to participate in water production again. By releasing the excess clean water, the pipeline and the water channel components thereon can be protected and the service life can be extended.

[0012] Exemplarily, the water purifier further includes a controller, which is electrically connected to the water pump and the heater. The controller is used to control the heater and the water pump to be turned off simultaneously after the booster pump performs a shutdown operation. The controller controls the heater and the water pump to be turned off simultaneously to ensure that the temperature of the hot water flowing out of the water intake port can still meet the user's requirements, even if the booster pump stops working, the water flowing out of the water intake port is still hot water. It also prevents the heater from continuing to heat the water after the water in the hot water pipeline stops flowing, generating high-temperature steam or even dry burning, damaging the hot water pipeline and components located on the hot water pipeline.

[0013] Exemplarily, the water purifier also includes an intelligent faucet connected to the water inlet. The intelligent faucet can accurately control the water output, avoid unnecessary waste, and improve water efficiency. The intelligent faucet can also reduce the number of times the hand touches the faucet through sensing technology, thereby avoiding the spread of bacteria and viruses, and is more hygienic and convenient. In addition, in a water purifier with a hot water making function, reducing the number of times the hand touches the faucet can also reduce the risk of being scalded by hot water.

[0014] Exemplarily, the water purifier further includes a normal temperature water pipeline, which is connected between the purified water outlet and the water inlet of the filter device, and a water outlet solenoid valve is provided on the normal temperature water pipeline, which is configured to be closed in response to the user's stopping of the normal temperature water extraction operation. The normal temperature water pipeline directly uses the pressure in the filter device to transport the normal temperature water to the water inlet, which makes the water circuit simpler and more efficient, and saves energy. The water outlet solenoid valve can be closed when the booster pump stops working. This prevents the user from continuing to leak water from the water inlet due to the pressure in the filter device after the normal temperature water is collected.

[0015] Exemplarily, a zero-pressure valve is also provided on the hot water pipeline, and the zero-pressure valve is located upstream of the water pump. When the water inlet pressure of the water pump fluctuates, the accuracy of its flow control may be reduced. When the heater is an instant heater, the temperature of the hot water heated by the heater may be unstable. Therefore, the zero-pressure valve provided upstream of the water pump can provide a stable water inlet pressure for the water pump, thereby accurately controlling the water flow through the heater, and thus making the temperature of the hot water at the water intake relatively stable.

[0016] A series of simplified concepts are introduced in the utility model content, which will be further described in detail in the detailed implementation section. The utility model content section does not mean to attempt to define the key features and essential technical features of the technical solution claimed for protection, nor does it mean to attempt to determine the scope of protection of the technical solution claimed for protection.

[0017] The advantages and features of the present invention are described in detail below in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The following drawings of the present invention are used as part of the present invention for understanding the present invention. The drawings show the implementation of the present invention and its description, and are used to explain the principle of the present invention. In the drawings,

[0019] Figure 1 A water circuit diagram of a water purifier according to an exemplary embodiment of the present application is shown;

[0020] The above drawings include the following reference numerals:

[0021] 100. Water purifier; 101. Raw water inlet; 102. Water intake; 103. Drain outlet; 1041. Hot water pipeline; 1042. Normal temperature water pipeline; 105. Waste water pipeline; 106. Return pipeline; 110. Booster pump; 120. Filter device; 121. Raw water inlet; 122. Purified water outlet; 123. Concentrated water outlet; 130. Check valve; 140. Concentrated water solenoid valve; 150. Water inlet solenoid valve; 160. Water outlet solenoid valve; 170. Zero pressure valve; 180. Flow meter; 210. Water pump; 220. Heater. DETAILED DESCRIPTION

[0022] In the following description, a large number 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 illustrates preferred embodiments of the present invention, and the present invention can be implemented without one or more of such details. In addition, in order to avoid confusion with the present invention, some technical features known in the art are not described in detail.

[0023] To at least partially solve the above problems, according to an embodiment of the present invention, a water purifier 100 is provided. Figure 1 As shown, the water purifier 100 has a raw water inlet 101 and a water intake 102, and the raw water inlet 101 can obtain raw water from a municipal water supply or other suitable water source. The water purifier 100 may also include a booster pump 110. The water inlet of the booster pump 110 is connected to the raw water inlet 101, and the raw water can be pressurized. The water purifier 100 may also include a filter device 120, and the filter device 120 includes a raw water inlet 121 and a clean water outlet 122. The raw water inlet 121 of the filter device 120 is connected to the water outlet of the booster pump 110, and the clean water outlet 122 of the filter device 120 is connected to the water intake 102. Exemplarily, the filter device 120 may include, for example, one or more of a reverse osmosis filter element and a nanofiltration filter element.

[0024] Exemplarily, the water purifier 100 may be provided with a hot water pipeline 1041. The hot water pipeline 1041 is connected between the purified water outlet 122 of the filter device 120 and the water inlet 102. A heater 220 is provided on the hot water pipeline 1041, and the heater 220 is used to heat the water in the hot water pipeline 1041. Exemplarily, the heater 220 may be one or more of a resistance heater, a carbon fiber heater, a quartz tube heater, a ceramic heater, a thick film heater, and the like.

[0025] Exemplarily, the booster pump 110 is configured to perform a shutdown operation in response to the user's stop taking hot water operation. For example, a stop water extraction button may be provided on the water purifier 100. When the user obtains the required amount of hot water and clicks the stop water extraction button, the booster pump 110 stops working. However, since the booster pump 110 continues to work when the user takes hot water, the water in the filter device 120 will have a higher water pressure. After the booster pump 110 stops working, this part of the water pressure will not be released immediately. Therefore, the accumulated pressure will be slowly released through the hot water pipeline 1041, which will cause the water intake 102 of the water purifier 100 to leak. The inventor has proposed a new design that allows the pump 210 on the hot water pipeline 1041 to be set to be closed after the booster pump 110 performs the shutdown operation. That is, the pump 210 is delayed for a period of time after the booster pump 110 stops working before closing, thereby releasing the pressure in the filter device 120, preventing the residual water in the pipeline from slowly and continuously leaking out through the water intake 102 under the action of pressure. In addition, it also prevents high-pressure water from always being stored in the filter device 120 and the hot water pipe 1041 after the user has finished taking hot water, thereby extending the service life of the water purifier 100. For example, a mechanical delay device or a capacitor discharge delay device can be provided to control the water pump 210 to delay closing after the booster pump 110 is closed.

[0026] Exemplarily, the water purifier 100 may further include a controller. The controller may be constructed using electronic components such as a timer, a comparator, a register, a digital logic circuit, or may be implemented using processor chips such as a single chip microcomputer, a microprocessor, a programmable logic controller (PLC), a digital signal processor (DSP), a field programmable gate array (FPGA), a programmable logic array (PLA), an application specific integrated circuit (ASIC), and their peripheral circuits. The controller may be electrically connected to the boost pump 110 and the water pump 210. The controller is used to control the water pump 210 to close after the first preset time period after the boost pump 110 performs the closing operation. The time for the water pump 210 to delay closing can be accurately controlled by the controller, so that when the water pump 210 stops working, the pressure in the filter 120 can be released to the point where it will not cause water inlet 102 to leak.

[0027] In addition to controlling the time of delaying the closure of the water pump 210 by time, optionally, the time of delaying the closure of the water pump 210 can be controlled by statistical flow. Exemplarily, the water purifier 100 may also include a flow meter 180. The flow meter 180 may include any suitable flow meter such as a differential pressure flow meter, a rotor flow meter or an electromagnetic flow meter. The flow meter 180 is used to detect the water flow in the hot water pipeline 1041. The controller is electrically connected to the flow meter 180, the booster pump 110 and the water pump 210, and the controller is used to control the water pump 210 to close after the booster pump 110 performs the closing operation and when the water flow is less than the preset flow threshold. Exemplarily, the preset flow threshold can be the flow of the water pump 210 when extracting pressureless water. When the flow detected by the flow meter 180 is less than the preset flow threshold, it can be explained that the water pump 210 has completely released the water pressure of the filter device 120. At this time, the controller controls the closure of the water pump 210 to achieve a better leak-proof effect. Exemplarily, the controller may also control the heating power of the heater 220 according to the flow information in the hot water pipeline 1041 detected by the flow meter 180 , thereby controlling the temperature of the hot water produced by the heater 220 .

[0028] Exemplarily, in any embodiment including a controller, the controller can be electrically connected to the pump 210 and the heater 220. The controller is used to control the heater 220 and the pump 210 to be turned off at the same time after the booster pump 110 performs the shutdown operation. The controller controls the heater 220 and the pump 210 to be turned off at the same time to ensure that the temperature of the hot water flowing out of the water inlet 102 can still meet the user's requirements, even if the booster pump 110 stops working, the water flowing out of the water inlet 102 is still hot water. And it also prevents the heater 220 from continuing to heat the water after the water in the hot water pipeline 1041 stops flowing, generating high-temperature steam or even dry burning, damaging the hot water pipeline 1041 and the components located on the hot water pipeline 1041. Preferably, when the flow rate detected by the flow meter 180 becomes smaller, the power of the heater 220 can be synchronously controlled to decrease, thereby achieving the purpose of accurately controlling the hot water temperature of the water inlet 102.

[0029] Exemplarily, when the filter device 120 adopts a reverse osmosis filter element, the filter device 120 may further include a concentrated water outlet 123. For this purpose, the water purifier 100 may also be provided with a wastewater pipeline 105 connected between the concentrated water outlet 123 and the drain 103. A concentrated water solenoid valve 140 may be provided on the wastewater pipeline 105. The concentrated water produced by the filter device 120 can be discharged to the outside of the water purifier 100 through the drain 103. A wastewater ratio valve may also be provided on the wastewater pipeline 105. The wastewater ratio valve allows the filter device 120 to produce concentrated water in a certain proportion during the production of purified water, so that the pressure in the filter device 120 can be maintained to ensure normal water production, and the impurities in the raw water can be discharged in time through the wastewater ratio valve to extend the service life of the filter device 120. Exemplarily, the wastewater ratio valve can be connected in parallel with the concentrated water solenoid valve 140, and the wastewater ratio valve and the concentrated water solenoid valve 140 can also be integrated together to form a wastewater combination valve. For example, a water hole may be provided on the valve core of the concentrated water solenoid valve 140 or any other suitable position, and the water hole forms a wastewater ratio valve. When the valve core of the concentrated water solenoid valve 140 is opened, wastewater can pass through the concentrated water solenoid valve 140 at a large flow rate; when the valve core of the concentrated water solenoid valve 140 is closed, wastewater can only be discharged through the water hole, thereby limiting the flow rate of wastewater. This integrated wastewater ratio valve and concentrated water solenoid valve 140 have a compact structure and higher reliability.

[0030] Exemplarily, the controller can also be used to control the concentrated water solenoid valve 140 to open for a second preset time period and then close when the boost pump 110 performs a closing operation. After the concentrated water solenoid valve 140 is opened, the pressure accumulated in the filter device 120 (especially the pressure before the membrane) can be quickly discharged. By opening the concentrated water solenoid valve 140 after the water purifier 100 completes filtering water, that is, after the boost pump 110 stops working, it can be avoided that the accumulated pressure causes the concentrated water to slowly flow out of the wastewater ratio valve and generate continuous noise for a long time. Exemplarily, the concentrated water solenoid valve 140 can be a normally closed solenoid valve, which is opened in an energized state to allow a large water flow to pass. The concentrated water solenoid valve 140 will continue to consume electrical energy in an open state, and the coil will heat up. In order to extend the service life of the concentrated water solenoid valve 140 and the circuit that controls its opening, and reduce energy consumption at the same time, the controller can start timing when the concentrated water solenoid valve 140 is opened, and control the concentrated water solenoid valve 140 to close when the accumulated time reaches the second preset time period. The second preset time period can be reasonably set according to actual needs, for example, according to the conditions of the filter device 120 and the booster pump 110 of the water purifier 100. To ensure that the concentrated water is drained, the concentrated water solenoid valve 140 can be opened for 3-5 seconds. In other words, the second preset time period can be set to 3-5 seconds. After that, the concentrated water solenoid valve 140 is closed and will not continue to consume power or generate heat, thereby extending the service life of the concentrated water solenoid valve 140 and the circuit that controls its opening.

[0031] Exemplarily, the controller can also be used to control the concentrated water solenoid valve 140 to open when the booster pump 110 is working. For example, after the water purifier 100 has been working for a long time, the filter device 120 needs to be flushed, and the concentrated water solenoid valve 140 can be opened. At this time, the booster pump 110 starts to work, and the raw water can pass through the filter device 120 at a large flow rate and be discharged from the water purifier 100 from the opened concentrated water solenoid valve 140. At this time, the large flow of raw water can remove impurities deposited in the filter device 120, thereby extending the service life of the filter device 120.

[0032] For example, reference Figure 1 , the water purifier 100 may further include a water inlet solenoid valve 150, which is connected between the water inlet of the booster pump 110 and the raw water inlet 101. The controller is also used to control the water inlet solenoid valve 150 to close in response to stopping the hot water extraction operation. The water inlet solenoid valve 150 is connected in series between the raw water inlet 101 and the filter device 120. As described above, since the raw water inlet 101 can be connected to municipal tap water, the municipal tap water has a certain pressure. When the filter device 120 uses a filter element such as a reverse osmosis filter element or a nanofiltration filter element, since such a filter element has a concentrated water outlet 123, even when the booster pump 110 is turned off, tap water will pass through the booster pump 110 and be discharged from the concentrated water outlet 123 of the filter device 120. The controller can control the water inlet solenoid valve 150 to close when the booster pump 110 stops working, thereby cutting off the water source. Such a setting can avoid the waste of resources when the water purifier 100 is not working, when the raw water flows out from the drain 103.

[0033] Exemplarily, the water purifier 100 may further include an intelligent faucet connected to the water inlet 102. The intelligent faucet can accurately control the water output, avoid unnecessary waste, and improve water efficiency. The intelligent faucet can also reduce the number of times the hand touches the faucet through sensing technology, thereby avoiding the spread of bacteria and viruses, and is more hygienic and convenient. In addition, in the water purifier 100 with a hot water making function, reducing the number of times the hand touches the faucet can also reduce the risk of being scalded by hot water.

[0034] For example, reference Figure 1, the water purifier 100 may also include a normal temperature water pipeline 1042 connected between the clean water outlet 122 of the filter device 120 and the water inlet 102. The normal temperature water pipeline 1042 can be connected in parallel with the hot water pipeline 1041, so that the normal temperature water pipeline 1042 is used to transport the normal temperature water to the water inlet 102 for use by the user. The normal temperature water pipeline 1042 directly uses the pressure in the filter device 120 to transport the normal temperature water to the water inlet 102, and the waterway is simpler and more efficient, while saving energy. Preferably, a water outlet solenoid valve 160 may be provided on the normal temperature water pipeline 1042, and the water outlet solenoid valve 160 may be closed when the booster pump 110 stops working. Prevent the user from receiving the normal temperature water after the normal temperature water is completed, because there is still pressure in the filter device 120, causing the water to continue to leak from the water inlet 102. Of course, the hot water pipeline 1041 can also be used to directly transport the unheated clean water to the water inlet 102. Specifically, when the user needs normal temperature water, the controller can control the heating body 220 not to work, and use the water pump 210 to pump water to the water intake 102. The hot water pipeline 1041 is used to provide normal temperature water to the user, making the water purifier 100 simpler and more compact.

[0035] Exemplarily, the flow rate of the above-mentioned water pump 210 is adjustable, and the controller is also used to adjust the flow rate of the water pump 210 based on the target hot water temperature input by the user. Exemplarily, when the power of the heater 220 is determined, the greater the water flow rate passing through the heater 220, the lower the water outlet temperature of the heater 220. When the user needs hot water at a higher temperature, the controller can control the pumping flow rate of the water pump 210 to decrease so that the water temperature at the water intake 102 reaches the target hot water temperature input by the user. The water purifier 100 may also include a reflux pipeline 106. The water inlet of the reflux pipeline 106 is connected to the inlet of the hot water pipeline 1041, and the outlet of the reflux pipeline 106 is connected to the inlet of the booster pump 110. A check valve 130 may also be provided on the reflux pipeline 106.

[0036] For example, reference Figure 1 , the flow rate of the water pump 210 is adjustable. Exemplarily, the water pump 210 may be a flow control pump that can accurately adjust the water flow rate. Since the flow control pump may have consistency differences, the length of time the water purifier 100 is used may also affect the flow accuracy of the flow control pump. Therefore, the flow information detected by the flow meter 180 can also be used to implement closed-loop control of the flow control pump to improve the flow accuracy.

[0037] Exemplarily, the controller can be used to control the working time of the pump 210 based on the flow information so that the water intake at the water intake 102 reaches the target water intake. The water purifier 100 can obtain the user's target water intake, control the pump 210 to pump clean water at a suitable flow rate, such as at a rated flow rate, and obtain flow information. The controller can obtain flow information in real time, obtain flow information only once, or obtain flow information every time interval (for example, 1 second). According to the flow information, the controller controls the pump 210 to pump clean water at the current flow rate until the time required to reach the target water intake; or adjust the flow rate of the pump 210 and the working time of the pump 210 at the same time, so that the amount of water reaching the water intake 102 reaches the target water intake. Exemplarily and not restrictively, it may take time for the flow of the pump 210 to stabilize. The controller can wait for a certain period of time after the pump 210 starts working, and then calculate the working time of the pump 210 according to the flow information, and appropriately compensate the working time to ensure the accuracy of the target water intake. In another exemplary embodiment, the flow meter 180 obtains flow information in real time, and the controller calculates the water volume based on the real-time flow information to control the target water intake, thereby providing the user with normal temperature water or hot water of the target water intake.

[0038] Exemplarily, the controller can also be used to control the pumping flow of the water pump 210 and / or the power of the heating pipe based on the flow information, so that the water temperature at the water inlet 102 reaches the target water intake temperature. When the power of the heater 220 is determined, the greater the water flow through the heater 220, the lower the water outlet temperature of the heater 220. The flow of the purified water to be heated can be controlled by the water pump 210, thereby coordinating with the power of the heater 220 to ensure that the output water temperature reaches the target water intake temperature.

[0039] Exemplarily, for a water purifier 100 in which the heater 220 is an instantaneous type, due to the power limitation of the heater 220, when a user needs to use hot water at a higher temperature, the heater 220 requires a smaller water flow rate pumped by the water pump 210 to heat the water to the temperature required by the user. The water production capacity of the filter device 120 is generally determined by the pumping water pressure of the booster pump 110 and the performance of the filter device 120 itself. In order to meet the operating pressure of the filter device 120, the pumping water pressure of the booster pump 110 generally does not change. Therefore, the water production capacity of the filter device 120 generally does not change. Therefore, when the water flow rate required by the heater 220 is relatively small, high pressure may accumulate between the clean water outlet 122 of the filter device 120 and the zero-pressure valve 170 (if any) or between the clean water outlet 122 and the water pump 210. Continuous high pressure may cause the pipeline to rupture and damage the water path components on the pipeline. Reference Figure 1For this purpose, a return pipe 106 can be provided between the clean water outlet 122 of the filter device 120 and the water inlet of the booster pump 110, and a check valve 130 is provided on the return pipe 106, so that when the water flow at the clean water outlet 122 of the filter device 120 is greater than the water output pumped by the pump 210, the excess clean water is returned to the upstream of the booster pump 110 to participate in water production again. By releasing the excess clean water, the pipeline and the water channel components thereon can be protected and their service life can be extended.

[0040] For example, reference Figure 1 The hot water pipeline 1041 may also be provided with a zero pressure valve 170 located upstream of the water pump 210. When the water inlet pressure of the water pump 210 fluctuates, the accuracy of its flow control may be reduced. When the heater 220 is an instant heater, the temperature of the hot water heated by the heater 220 may also be unstable. Therefore, the zero pressure valve 170 provided upstream of the water pump 210 can provide a stable water inlet pressure for the water pump 210, thereby accurately controlling the water flow through the heater 220, and thus making the temperature of the hot water at the water intake 102 relatively stable.

[0041] In the description of the present invention, it should be understood that the directions or positional relationships indicated by directional words such as "front", "back", "up", "down", "left", "right", "lateral", "vertical", "vertical", "horizontal", "top", "bottom", etc. are usually based on the directions or positional relationships shown in the drawings, and are 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 direction or be constructed and operated in a specific direction, 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 contours of each component itself.

[0042] 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.

[0043] 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 utility model. 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.

[0044] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention 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 invention described herein can be implemented in an order other than those illustrated or described herein.

[0045] The utility model has been described through 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 utility model to the scope of the described embodiments. In addition, it can be understood by those skilled in the art that the utility model is not limited to the above embodiments, and more variations and modifications can be made according to the teachings of the utility model, and these variations and modifications all fall within the scope of protection claimed by the utility model. The protection scope of the utility model is defined by the attached claims and their equivalents.

Claims

1. A water purifier having a raw water inlet and a water intake, characterized in that: include: A booster pump, wherein the water inlet of the booster pump is connected to the raw water inlet; A filter device, the filter device comprising a raw water inlet and a clean water outlet, the water outlet of the booster pump being connected to the raw water inlet of the filter device; A hot water pipeline, the hot water pipeline is connected between the purified water outlet and the water intake of the filtering device, and a water pump is provided on the hot water pipeline; and a heater, the heater being used to heat the water in the hot water pipeline, The booster pump is configured to perform a shut-down operation in response to a user's operation of stopping taking hot water, and the water pump is configured to shut down after the booster pump performs the shut-down operation.

2. The water purifier according to claim 1, characterized in that: The water purifier further includes a controller electrically connected to the booster pump and the water pump, and configured to control the water pump to shut down after a first preset time period after the booster pump performs the shut-down operation.

3. The water purifier according to claim 1, characterized in that: The water purifier also includes: a flow meter, the flow meter being used to detect the water flow in the hot water pipeline; and A controller is electrically connected to the flow meter, the booster pump and the water pump, and is used to control the water pump to shut down after the booster pump performs the shut-down operation and when the water flow rate is less than a preset flow threshold.

4. The water purifier according to claim 2 or 3, characterized in that: The filtering device further comprises a concentrated water outlet, and the water purifier further comprises: Drains; and A concentrated water solenoid valve is connected between the concentrated water port and the drain port. The controller is also used to control the concentrated water solenoid valve to open for a second preset time period and then close when the boost pump performs the closing operation.

5. The water purifier according to claim 2 or 3, characterized in that: The water purifier also includes: A water inlet solenoid valve is connected between the booster pump and the raw water inlet, and the controller is also used to control the water inlet solenoid valve to close in response to the stopping of the hot water extraction operation.

6. The water purifier according to claim 2 or 3, characterized in that: The flow rate of the water pump is adjustable, and the controller is further used to adjust the flow rate of the water pump based on the target hot water temperature input by the user. The water purifier also includes: A reflux pipeline, the water inlet of the reflux pipeline is connected to the inlet of the hot water pipeline, the outlet of the reflux pipeline is connected to the inlet of the booster pump, and a check valve is arranged on the reflux pipeline.

7. The water purifier according to claim 1, characterized in that: The water purifier also includes: A controller is electrically connected to the water pump and the heater, and is used for controlling the heater and the water pump to be turned off simultaneously after the booster pump performs the shut-down operation.

8. The water purifier according to claim 1, characterized in that: The water purifier also includes an intelligent faucet connected to the water intake.

9. The water purifier according to claim 1, characterized in that: The water purifier also includes: A normal temperature water pipeline is connected between the clean water outlet and the water intake of the filtering device. A water outlet solenoid valve is provided on the normal temperature water pipeline. The water outlet solenoid valve is constructed to close in response to the user's stopping of the normal temperature water extraction operation.

10. The water purifier according to claim 1, characterized in that: The hot water pipeline is also provided with a zero-pressure valve, which is located upstream of the water pump.

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