Water purifier

Abstract

The utility model provides a water purifier which is provided with a raw water inlet, a hot water outlet and a water outlet and further comprises a filter assembly, a zero-pressure valve, a heating module and a pressure release valve which are arranged in series, a water inlet of the filter assembly is connected to the raw water inlet, and a water outlet of the filter assembly is connected to a water inlet of the zero-pressure valve; the heating module comprises a heating pipe and a connecting pipe, the heating pipe is connected between the water outlet of the zero-pressure valve and the hot water outlet through the connecting pipe, the connecting pipe has first bearing pressure, and a joint of the connecting pipe has second bearing pressure; a water inlet of the pressure release valve is connected to a water outlet of the zero-pressure valve, a water outlet of the pressure release valve is connected to the water outlet, the pressure release valve is constructed to be opened when the pressure of the water inlet of the pressure release valve is larger than or equal to a preset pressure threshold value, and the preset pressure threshold value is not larger than any one of the first bearing pressure and the second bearing pressure. And the pressure release valve can release the purified water to the water outlet, so that the water path where the heating module is located is always kept at proper pressure, and the water purifier can normally output hot water.

Description

Technical Field

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

[0002] As people's quality of life continues to improve, water purifiers have become common household appliances. Water purifiers typically connect to municipal tap water and provide purified water to users. Purified water filters out harmful bacteria, viruses, heavy metals, and other substances, making it more beneficial to health.

[0003] Many common water purifiers on the market are already equipped with a heating function. This allows users to obtain purified water at a preset temperature directly from the water purifier without the need for additional electrical appliances such as electric kettles. This greatly simplifies operation and provides a good user experience. The water purifier can control the water flow through the pumping component, so that the output hot water temperature meets the user's needs. On this basis, the water purifier can also be equipped with a zero-pressure valve. The zero-pressure valve can be placed upstream of the pumping component to provide the pumping component with clean water without pressure, thereby preventing water pressure fluctuations from interfering with the flow of the pumping device.

[0004] Over time, the zero-pressure valve in a water purifier can age, leading to increased pressure in the downstream piping. Since the downstream heating pipe is typically connected with a silicone hose, which has limited pressure-bearing capacity, there's a high risk of the hose connector becoming detached from the water path components within the purifier or the hose itself rupturing. This can cause water to flow into other parts of the purifier and onto the floor, leading to serious problems like short circuits and soaking the floor. 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, including: a filter assembly and a zero-pressure valve arranged in series, the water inlet of the filter assembly is connected to the raw water inlet, and the water outlet of the filter assembly is connected to the water inlet of the zero-pressure valve; a heating module, the heating module includes a heating tube and a connecting tube, the heating tube is connected between the water outlet of the zero-pressure valve and the hot water outlet through the connecting tube, the connecting tube itself has a first bearing pressure, and the joint of the connecting tube has a second bearing pressure; a pressure relief valve, the water inlet of the pressure relief valve is connected to the water outlet of the zero-pressure valve, and the water outlet of the pressure relief valve is connected to the drain outlet, and the pressure relief valve is constructed to open when the pressure at its water inlet is greater than or equal to a preset pressure threshold, wherein the preset pressure threshold is not greater than either the first bearing pressure and the second bearing pressure.

[0006] In the above technical solution, if the zero-pressure valve fails, the water purifier can promptly release the higher-pressure purified water through the pressure relief valve, thereby preventing leakage caused by the downstream connecting pipe joints with weaker pressure-bearing capacity falling off or the connecting pipe rupturing, thereby preventing accidents such as short circuits and electrical leakage in the water purifier itself caused by water leakage. The pressure relief valve can release the purified water that has passed through the failed zero-pressure valve to the drain outlet, thereby maintaining the appropriate pressure in the water channel where the heating module is located, allowing the water purifier to output hot water normally.

[0007] Exemplarily, the water purifier also includes a first flow detection device, and the heating module also includes a flow control pump. The first flow detection device and the flow control pump are connected in series between the zero-pressure valve and the heating tube along the water flow direction. The first flow detection device is used to detect the first flow information of the pipeline. The water purifier also includes a controller, which is used to control the working time of the flow control pump based on the first flow information so that the water intake at the hot water outlet reaches the target water intake.

[0008] In this way, the target amount of clean water or hot water can be provided to the user.

[0009] Exemplarily, the water purifier also includes a first flow detection device, and the heating module also includes a flow control pump. The first flow detection device and the flow control pump are connected in series between the zero-pressure valve and the heating tube along the water flow direction. The first flow detection device is used to detect the first flow information of the pipeline. The water purifier also includes a controller, which is used to control the pumping flow of the flow control pump and / or the power of the heating tube based on the first flow information, so that the water temperature at the hot water outlet reaches the target water intake temperature.

[0010] The flow rate of the purified water to be heated can be controlled by the flow control pump, thereby coordinating with the power control of the heating tube to ensure that the output water temperature reaches the target water intake temperature.

[0011] Exemplarily, the water inlet of the pressure relief valve is connected to the pipeline between the zero-pressure valve and the first flow detection device.

[0012] The first flow detection device is set between the water inlet of the pressure relief valve and the water inlet of the heating module to detect the actual amount of water reaching the heating module. This can ensure that the amount of water reaching the hot water outlet is more accurate and the temperature of the hot water output by the heating module is also more accurate.

[0013] Exemplarily, the water purifier further includes a solenoid valve, which is connected in series with the filter assembly and is located upstream of the zero-pressure valve. The controller is configured to disconnect the solenoid valve by controlling the solenoid valve when the first flow information indicates that the current flow is greater than a first flow threshold.

[0014] When both the zero-pressure valve and the pressure relief valve fail to operate normally, the flow rate indicated by the first flow rate information detected by the first flow detection device increases significantly. If the water flow is not cut off, the connecting pipe joint may fall off or the connecting pipe may rupture. In this case, the water flow can be cut off by controlling the solenoid valve to prevent water leakage.

[0015] Exemplarily, the water purifier also includes: a solenoid valve, which is connected in series with the filter assembly and is located upstream of the zero-pressure valve; a temperature detection device arranged on the heating tube and / or downstream of the heating tube; and a controller, which is used to close the solenoid valve when the temperature information detected by the temperature detection device indicates that the current temperature reaches a preset temperature.

[0016] The controller can determine the location of the shedding or rupture by the different locations where the temperature anomaly occurs, generate different fault information, and promptly control the heating module to stop working and the solenoid valve to close.

[0017] Exemplarily, the water purifier further includes a prompting device, and the controller is further configured to generate a first fault message and send the first fault message to the prompting device when the solenoid valve is disconnected.

[0018] The first fault information may include a code or other text displayed on the display screen, which can prompt the user or maintenance personnel to facilitate troubleshooting. The first fault information can be stored in the controller, and the water purifier can still prompt the fault when the user turns off the water purifier or turns it on again after a power outage.

[0019] Exemplarily, the water purifier further includes a smart faucet connected to the hot water outlet, and the prompt device includes a display device provided on the smart faucet.

[0020] When the water purifier fails, the user can detect it immediately and it is not easy to miss it. In addition, the water purifier body does not have a reminder device, which can not only reduce the cost of the water purifier, but also make the installation of the water purifier more flexible.

[0021] Exemplarily, the water purifier includes a second flow detection device, a prompt device and a controller. The second flow detection device is connected in series with the pressure relief valve and is used to detect second flow information flowing through the pressure relief valve; the controller is also used to generate a second fault information and send it to the prompt device when the second flow information indicates that the current flow is greater than a second preset flow threshold.

[0022] The reminder device can remind the user to repair the water purifier, such as replacing the zero-pressure valve to avoid a large amount of purified water being wasted.

[0023] Exemplarily, the water purifier further includes a smart faucet connected to the hot water outlet, and the prompt device includes a display device provided on the smart faucet.

[0024] When the water purifier fails, the user can detect it immediately and it is not easy to miss it. In addition, the water purifier body does not have a reminder device, which can not only reduce the cost of the water purifier, but also make the installation of the water purifier more flexible.

[0025] Exemplarily, the water purifier also includes: a booster pump and a return line, the booster pump is arranged in series between the raw water inlet and the filter assembly, the water inlet of the return line is connected to the water outlet of the filter assembly, the water outlet of the return line is connected to the water inlet of the booster pump, and a return valve is provided on the return line. The return valve is constructed to open when the pressure at its water inlet is greater than or equal to a second preset pressure threshold, and the second preset pressure threshold is less than the rated pressure of the zero-pressure valve.

[0026] After setting the return line, the water pressure acting on the zero-pressure valve is usually less than 0.4MPa, thereby extending the service life of the zero-pressure valve.

[0027] Exemplarily, the water purifier further includes: a cold water outlet, a cold water pipeline connected between the cold water outlet and the water outlet of the filter assembly, and a hot water solenoid valve, which is connected in series upstream of the zero-pressure valve and in parallel with the cold water pipeline.

[0028] Even if the zero-pressure valve fails, the hot water solenoid valve can be closed to ensure the normal supply of cold water and the user experience.

[0029] The Summary of the Utility Model introduces a series of simplified concepts, which will be further described in detail in the Detailed Description of the Utility Model. This Summary of the Utility Model does not intend to limit the key features and essential technical features of the claimed technical solution, nor does it intend to determine the scope of protection of the claimed technical solution.

[0030] The advantages and features of the present invention are described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] 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,

[0032] Figure 1 A water circuit diagram of a water purifier according to an exemplary embodiment of the present application is shown;

[0033] Figure 2 A water circuit diagram of a water purifier according to another exemplary embodiment of the present application is shown.

[0034] The above drawings include the following reference numerals:

[0035] 101, raw water inlet; 102, hot water outlet; 103, drain outlet; 104, cold water outlet; 110, filter assembly; 111, booster pump; 112, central filter element; 112a, raw water inlet; 112b, pure water inlet; 112c, concentrated water inlet; 120, return line; 121, return valve; 1301, 1302, connecting pipes; 131, zero pressure valve; 132, first flow detection device; 13 3. Heating module; 1331. Flow control pump; 1332. Heating tube; 134. Hot water solenoid valve; 135. Second flow detection device; 140. Pressure relief valve; 150. Cold water pipeline; 151. Cold water solenoid valve; 160. Smart faucet; 161. Second temperature detection device; 170. Concentrated water solenoid valve; 180. Water inlet solenoid valve; 190. Pre-filter element; 200. Controller; 300. Prompt device. DETAILED DESCRIPTION

[0036] In the following description, numerous details are provided to facilitate a thorough understanding of the present invention. However, those skilled in the art will appreciate that the following description merely illustrates preferred embodiments of the present invention, and that the present invention may be practiced without one or more of these details. Furthermore, to avoid confusion with the present invention, some technical features well known in the art have not been described in detail.

[0037] The heating tubes in common water purifier heating modules are typically made of stainless steel. However, stainless steel heating tubes are not compatible with pressure-bearing quick-connect fittings. Instead, a connecting tube, such as silicone tubing, is directly attached to the water inlet and outlet of the heating tube. In other words, the connecting tube's connector relies on its own elasticity or is secured to the heating tube by simple binding. Silicone tubing offers advantages such as high temperature resistance, no risk of contamination to the purified water, flexible design that reduces space requirements, ease of attachment to connectors, and low cost. Furthermore, the heating module typically includes a water pump, which can be a standard component. The water pump's connector can be a trapezoidal joint. This type of joint is only easier to connect while ensuring a tight seal when silicone tubing is used. Similar to the heating tube, silicone tubing is currently a common method for connecting waterway components in heating modules. However, the pressure at the silicone tubing joint is relatively low. When secured with a clamp, the joint can withstand pressures of approximately 0.05 MPa to 0.1 MPa.

[0038] In addition, existing heating modules typically also include a water pump, which can pump water at the desired flow rate to the heating tube, thereby accurately controlling the water outlet temperature. However, the water pump has certain requirements for the pressure at its water inlet to achieve precise flow control, so a zero-pressure valve is installed upstream of the heating module. When the water purifier is required to provide hot water, the water can be pumped from the outlet of the zero-pressure valve through the water pump and pumped to the hot water outlet. Therefore, under normal circumstances, the heating module is almost not under pressure, so using silicone tubes as connecting tubes can meet current needs and is relatively low in cost.

[0039] The water inlet of a zero-pressure valve can be connected to a pressurized water source, while the water outlet pressure is almost zero. In other words, the outlet of the zero-pressure valve requires a water pump to pump clean water to restore the pressure to sufficient for flow. In this case, the flow rate downstream of the zero-pressure valve is unaffected by upstream pressure fluctuations, and the pipeline does not need to be pressurized. However, the zero-pressure valve may fail, losing its water-locking function, causing the pressure in the water path downstream of the valve to increase dramatically. For example, if the zero-pressure valve completely fails, the pressure upstream of the valve will directly enter the heating module, causing the silicone tubing to be subjected to significant pressure. Typically, the silicone tubing will first disconnect at the joint where it meets the connector. As mentioned above, the heating module may also include a water pump and, possibly, a flowmeter. These water path components are connected by silicone tubing, as is the zero-pressure valve and the heating module. Consequently, when the pressure upstream of the zero-pressure valve enters the heating module, each silicone tubing may become detached at the joint. In some cases, the silicone tubing itself may rupture rather than detach from the joint. In either case, it may cause serious water leakage in the water purifier or even an internal short circuit leading to fire and electric shock.

[0040] In order to at least partially solve the above problems, according to an embodiment of the present invention, a water purifier is provided. Figure 1As shown, the water purifier has a raw water inlet 101 and a hot water outlet 102. The raw water inlet 101 can obtain raw water from the municipal water supply or other suitable water source, and provide it to the user through the hot water outlet 102 after purification and heating. The water purifier may also include a filter assembly 110 and a zero-pressure valve 131 arranged in series, with the water inlet of the filter assembly 110 connected to the raw water inlet 101, and the water outlet of the filter assembly 110 connected to the water inlet of the zero-pressure valve 131. Exemplarily, the filter assembly 110 may include a central filter element 112 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 reverse osmosis filter elements and nanofiltration filter elements, the water needs to be pressurized before entering the filter element. In this case, the filter assembly 110 may also include a booster pump 111. Optionally, a pre-filter element 190 may be provided upstream of the filter assembly 110 to pre-filter the water entering the filter assembly 110 to extend the service life of the filter assembly 110. A certain proportion of concentrated water is produced during the filtration process by either the reverse osmosis filter element or the nanofiltration filter element, and the concentrated water is discharged from the drain outlet 103.

[0041] In an embodiment not shown, for a water purifier whose filtration assembly does not include a booster pump, when the water purifier is connected to municipal tap water, the municipal tap water can provide a pressure of 0.24 MPa. After passing through the filtration assembly, the pressure will hardly drop significantly. In this case, a zero-pressure valve can still be used to stabilize the downstream flow without the pipeline being subjected to pressure.

[0042] The water purifier is equipped with a heating module 133, which may include a heating pipe 1332 and a connecting pipe. The heating pipe 1332 is connected between the water outlet of the zero-pressure valve 131 and the hot water outlet 102 via the connecting pipe. As shown in the figure, the heating pipe 1332 is connected to the zero-pressure valve 131 via connecting pipe 1301 and to the hot water outlet 102 via connecting pipe 1302. The connecting pipes 1301 and 1302 themselves have a first bearing capacity, and the joint between the connecting pipes 1301 and 1302 has a second bearing capacity. The joint between the connecting pipes 1301 and 1302 refers to the connection between their ends and the corresponding waterway components (including the heating pipe 1332, the hot water outlet 1302, and the zero-pressure valve 131). As mentioned above, the connecting pipe is typically made of silicone tubing. Of course, in embodiments not shown, the connecting pipe can also be made of any suitable material, such as PP tubing or PE tubing. The heating pipe 1332 may include a flow-through heating pipe 1332, such as a stainless steel heating pipe. This type of heating tube 1332 can be heated by a suitable method such as resistive heating or electromagnetic heating. Optionally, the heating module 133 may also include a hot tank, in which hot water can be stored, thereby providing a large amount of hot water to the user in a short period of time with relatively small power. In short, the heating tube 1332 can heat the clean water from the water outlet of the zero-pressure valve 131. The connecting pipe can be sleeved on the joint of the heating tube 1332. On the basis of the connecting pipe being sleeved on the joint, in order to prevent loosening and water leakage, a cable tie or a clamp can be provided on the outside of the connecting pipe at the joint to more reliably fix the joint of the connecting pipe to various water channel components.

[0043] When the water flowing through the connecting pipe has a certain pressure, the connecting pipe may expand under the action of the pressure until it breaks. The pressure that the connecting pipe can withstand is the first bearing pressure. When the pressure is less than this pressure, the connecting pipe will not be damaged. When the pressure inside the connecting pipe is high, it may also cause the joint of the connecting pipe to expand, resulting in a decrease in the friction between the joint of the connecting pipe and various waterway components, and the connecting pipe will fall off at the joint. The pressure that the joint of the connecting pipe can withstand is called the second bearing pressure. Normally, the second bearing pressure is less than the first bearing pressure. During the process of rising pressure, when the pressure is equal to or greater than the second bearing pressure, the joint of the connecting pipe may fall off; and when the joint is locked by a clamp or other structure, the pressure rises further. When it is greater than or equal to the first bearing pressure, the connecting pipe will break because the material cannot withstand the pressure.

[0044] Usually when the zero-pressure valve 131 fails, the water purifier cannot work properly, for example, it cannot provide hot water, or even cannot provide cold water and hot water at all. As mentioned above, the connecting pipes 1301 and 1302 can withstand a pressure of 0.05MPa-0.1MPa. In other words, as long as the water pressure reaching the heating module 133 is within the pressure range of the connecting pipe, the water purifier can work normally. Therefore, the water purifier can also include a pressure relief valve 140, the water inlet of the pressure relief valve 140 is connected to the water outlet of the zero-pressure valve 131, and the water outlet of the pressure relief valve 140 is connected to the drain 103. The pressure relief valve 140 can adopt a suitable valve such as a pressure check valve. When the pressure at its water inlet is low, the pressure relief valve 140 will not usually open, and it will not cause the purified water to flow from the pressure relief valve 140 into the drain 103 under normal circumstances, causing waste. For example, the concentrated water outlet 112c of the central filter element 112 can be connected in parallel with the outlet of the pressure relief valve 140 to the drain outlet 103. Therefore, using a pressure check valve as the pressure relief valve 140 can also prevent the concentrated water discharged from the above-mentioned central filter element 112 from flowing back and prevent the clean water from being contaminated.

[0045] As described above, when the zero-pressure valve 131 fails due to various reasons such as aging, internal blockage, or reverse installation at the factory, the pressure in the downstream heating module 133 will increase sharply. Since the expansion of the connecting pipe requires a process, if the failure of the zero-pressure valve 131 can be discovered in time, the pressure can be reduced to below the preset pressure threshold by means of pressure relief, thereby preventing the connecting pipe from falling off or breaking, causing a large amount of water to flow out. The provision of the pressure relief valve 140 can automatically and promptly trigger its pressure relief function due to the increased pressure downstream when the zero-pressure valve 131 fails, without the need for complex detection means. The pressure relief valve 140 is low-cost and simple in structure, and therefore can reliably complete the pressure relief of the waterway. Since the pressure relief valve 140 does not operate under normal circumstances, its aging rate is usually relatively slow, and the pressure relief valve 140 usually does not fail before the zero-pressure valve 131 due to aging.

[0046] The pressure relief valve 140 can be constructed to open when the pressure at its water inlet is greater than or equal to a preset pressure threshold. Specifically, for example, the pressure relief valve 140 may include a water retaining member and a spring. The pressure relief valve 140 will only open when the water pressure at the water inlet is sufficient to push open the spring. At this time, the water pressure at the water inlet can be considered to be the preset pressure threshold of the pressure relief valve 140. Exemplarily, for some pressure relief valves 140, the pressure at the water inlet is considered to be the preset pressure threshold only when the water inlet pressure can cause it to reach the rated opening. Exemplarily, the pressure relief valve 140 can be unidirectional when the pressure difference is greater than 0.03 MPa, so that the water pressure in the pipeline connected to the water inlet of the pressure relief valve 140 will not be too high.

[0047] For the above-mentioned pressure relief valve 140 with a preset pressure threshold, if the preset pressure threshold of the pressure relief valve 140 is very small, it will open when the pressure in the connecting pipe is not large, resulting in a large amount of clean water leakage and waste. On the contrary, if the preset pressure threshold of the pressure relief valve 140 is greater than either the first bearing pressure or the second bearing pressure, the pressure relief valve 140 will not open to relieve pressure when the pressure is greater than the first bearing pressure or the second bearing pressure, or even if it opens to relieve pressure, the pressure in the waterway is still greater than the first bearing pressure or the second bearing pressure. This will cause the joint of the connecting pipe to fall off or the connecting pipe to rupture. Therefore, it is necessary to reasonably select the pressure relief valve 140 so that the preset pressure threshold is not greater than either the first bearing pressure or the second bearing pressure. For example, the preset pressure threshold can be equal to or less than the pressure that the above-mentioned joint can withstand, so as to maintain the pressure in the waterway at no more than 0.05Mpa when the zero-pressure valve 131 fails. Since the pressure in the pipeline from the failed zero-pressure valve 131 to the pressure relief valve 140 may decrease gradually, preferably, the pressure relief valve 140 can be connected to the zero-pressure valve 131 through a pipeline that can withstand pressure to prevent the pressure relief valve 140 from not being able to relieve the pressure in time, causing the connecting pipe joint between the zero-pressure valve 131 and the pressure relief valve 140 to fall off or the connecting pipe to rupture.

[0048] In the above technical solution, if the zero-pressure valve 131 fails, the water purifier can promptly release the higher-pressure purified water through the pressure relief valve 140, thereby preventing the downstream connecting pipe joints with weaker pressure-bearing capacity from falling off or the connecting pipes from rupturing, causing water leakage, and thus preventing accidents such as short circuits and electrical leakage caused by water leakage, including electrical equipment including the water purifier itself. The pressure relief valve 140 can release the purified water that has passed through the failed zero-pressure valve 131 to the drain outlet 103, thereby maintaining the water path where the heating module 133 is located at an appropriate pressure, allowing the water purifier to output hot water normally.

[0049] Exemplarily, the heating module 133 also includes a first flow detection device 132 and a flow control pump 1331. The first flow detection device 132 and the flow control pump 1331 are sequentially connected in series between the zero-pressure valve 131 and the heating pipe 1332 along the direction of water flow. The first flow detection device 132 is used to detect the first flow information of the pipeline in which it is located. Exemplarily, the flow control pump 1331 can be a diaphragm pump, and the water flow rate it pumps is positively correlated with the voltage it receives. When the water inlet pressure of the flow control pump 1331 increases, the accuracy of its flow control may decrease. Therefore, the zero-pressure valve 131 provided upstream thereof can provide it with a stable water inlet pressure. Since the flow control pump 1331 may have consistency differences, the length of time the water purifier is used may also affect the flow accuracy of the flow control pump 1331. To further improve the accuracy, a first flow detection device 132 can be provided to implement closed-loop control of the flow control pump 1331 based on the first flow information. The first flow detection device 132 can include any suitable flow meter such as a differential pressure flowmeter, a rotor flowmeter, or an electromagnetic flowmeter.

[0050] The water purifier also includes a controller 200, which can be built using electronic components such as timers, comparators, registers, digital logic circuits, etc., or implemented using processor chips such as single-chip microcomputers, microprocessors, programmable logic controllers (PLCs), digital signal processors (DSPs), field programmable gate arrays (FPGAs), programmable logic arrays (PLA), application-specific integrated circuits (ASICs), and their peripheral circuits.

[0051] Exemplarily, the controller 200 can be used to control the working time of the flow control pump 1331 based on the first flow information, so that the water intake at the hot water outlet 102 reaches the target water intake. The water purifier can obtain the user's target water intake, control the flow control pump 1331 to pump purified water at an appropriate flow rate, such as at a rated flow rate, and obtain the first flow information. The controller 200 can obtain the first flow information in real time, obtain the first flow information only once, or obtain the first flow information at intervals of a period of time (for example, 1 second). Based on the first flow information, the controller 200 controls the flow control pump 1331 to pump purified water at the current flow rate until the time required to reach the target water intake is reached; or simultaneously adjusts the flow rate of the flow control pump 1331 and the working time of the flow control pump 1331 so that the amount of water reaching the hot water outlet 102 reaches the target water intake. For example, when the target water intake is 1L and the flow control pump 1331 is controlled to pump clean water at a rated flow rate, the flow rate shown in the first flow information obtained is 1L / min, that is, it can be calculated that the working time of the flow control pump 1331 should be 1min. By way of example and not limitation, it may take time for the flow of the flow control pump 1331 to stabilize. The controller 200 can wait for a certain period of time after the flow control pump 1331 starts working, and then calculate the working time of the flow control pump 1331 based on the first flow information, and appropriately compensate for the working time to ensure the accuracy of the target water intake. In another exemplary embodiment, the controller 200 obtains the first flow information in real time, calculates the water volume based on the real-time first flow information, and controls the target water intake. In this way, the user can be provided with clean water or hot water of the target water intake.

[0052] For example, the controller 200 is further configured to control the pumping flow of the flow control pump 1331 and / or the power of the heating pipe 1332 based on the first flow information so that the hot water outlet 102 The water temperature reaches the target water intake temperature. When the power of heating tube 1332 is determined, the water flow rate through heating tube 1332 is inversely proportional to the water outlet temperature of heating tube 1332. The flow control pump 1331 can control the flow rate of the purified water to be heated, thereby coordinating with the power control of heating tube 1332 to ensure that the output water temperature reaches the target water intake temperature.

[0053] For example, the water inlet of the pressure relief valve 140 is connected to the pipeline between the zero-pressure valve 131 and the first flow detection device 132. Since the pressure relief valve 140 may have a sealing defect when the pressure differential is small, a small amount of water may leak into the drain outlet 103, thereby affecting the water flow reaching the heating module 133. Therefore, the first flow detection device 132 is placed between the water inlet of the pressure relief valve 140 and the water inlet of the heating module 133 to detect the actual amount of water reaching the heating module 133. This ensures more accurate measurement of the amount of water reaching the hot water outlet 102 and a more precise temperature of the hot water output by the heating module 133.

[0054] Exemplarily, the water purifier may include a solenoid valve, which is connected in series with the filter assembly 110 and located upstream of the zero-pressure valve 131. The controller 200 is used to control the solenoid valve to disconnect when the first flow information indicates that the current flow is greater than the first flow threshold.

[0055] The pipeline where the heating module 133 is located is an open pipeline. When the pressure increases, the flow rate in the pipeline also increases. Since the water flow rate that the flow control pump 1331 of the heating module 133 can provide is limited, a preset flow threshold can be set based on the rated power of the flow control pump 1331, that is, the maximum flow rate of the flow control pump 1331. When the controller 200 determines that the water flow rate is greater than the preset flow threshold based on the detected first flow information, it can be determined that the flow increase is due to the failure of the zero-pressure valve 131. As described above, when the zero-pressure valve 131 is operating normally, the flow rate indicated by the first flow information of the first flow detection device 132 is substantially consistent with the pumping flow rate of the flow control pump 1331. In the case where the zero-pressure valve 131 fails and the pressure relief valve 140 is operating normally, the flow rate indicated by the first flow information of the first flow detection device 132 may be slightly greater than the pumping flow rate of the flow control pump 1331, and will not cause a malfunction of the connecting pipe. If both the zero-pressure valve 131 and the pressure relief valve 140 are not functioning properly, the flow rate indicated by the first flow rate information detected by the first flow detection device 132 will increase significantly. If the water flow is not shut off, the connecting pipe joint will fall off or the connecting pipe will rupture. In this case, the water flow can be shut off by controlling the solenoid valve to prevent water leakage.

[0056] Preferably, the first flow detection device 132 can continuously detect the flow rate over a period of time and generate multiple pieces of first flow rate information. Specifically, for example, the first flow detection device 132 can detect the flow rate and generate multiple pieces of first flow rate information within one second. This effectively avoids misjudging short-term flow fluctuations caused by factors such as the water hammer effect due to a too-short detection time. Furthermore, the detection time is set to a reasonable value to prevent prolonged exposure of the heating module 133 to high pressure, which could lead to malfunctions in the connecting pipes 1301 and 1302. For example, experiments can be conducted to determine the specific flow rate at which the connecting pipe joints will fall off or rupture, and a preset flow rate threshold can be set based on this experimental data. Alternatively, the preset flow rate threshold can be set to be slightly greater than the flow rate when the zero-pressure valve 131 fails and the pressure relief valve 140 is open. This allows the user to continue using the water purifier even if the zero-pressure valve 131 fails and the pressure relief valve 140 is functioning properly. The flow rate detection time of the first flow detection device 132 can also be appropriately set based on actual conditions to avoid frequent false alarms or malfunctions in the connecting pipes 1301 and 1302.

[0057] Preferably, a pressure-bearing pipeline is used between the first flow detection device 132 and the zero-pressure valve 131. This prevents the pipeline between the first flow detection device 132 and the zero-pressure valve 131 from falling off or rupturing after the zero-pressure valve 131 and the pressure relief valve 140 fail, which in turn prevents the first flow detection device 132 from promptly detecting a flow rate greater than the preset flow threshold, leading to a large amount of water leakage. In contrast, using a pressure-bearing pipeline to connect the zero-pressure valve 131 and the first flow detection device 132 allows the leak to occur only downstream of the first flow detection device 132. This ensures that the first flow detection device 132 detects a flow rate greater than the preset flow threshold, allowing the water purifier to react promptly and cut off the water flow via the solenoid valve.

[0058] Exemplarily, the water purifier further includes a prompting device 300, and the controller 200 is further configured to generate and transmit a first fault message to the prompting device 300 when the solenoid valve is disconnected. The first fault message can be used to alert the user that the zero-pressure valve 131 has failed. Typically, a failure of the zero-pressure valve 131 is irreversible, and the fault cannot be corrected unless the zero-pressure valve 131 or its internal components are repaired or replaced. Users are generally unable to resolve this fault on their own. The controller 200 can generate the first fault message to alert the user that they need to contact maintenance personnel for repairs. Exemplarily, the prompting device 300 can include an audible and visual alarm device, and the first fault message can be transmitted to the user via the audible and visual alarm device of the prompting device 300 to inform the user that the water purifier has failed and cannot function properly. Specifically, for example, the water purifier can be connected to a display screen, which can be a display screen provided on the water purifier body or a display screen on the smart faucet 160 connected to the water purifier, as described below. The first fault message can include a code or other text displayed on the display screen, which can alert the user or maintenance personnel to facilitate troubleshooting. The first fault information may be stored in the controller 200 , and when the user turns off the water purifier or turns it on again after a power outage, the water purifier may still prompt a fault.

[0059] For example, the water purifier may further include a second flow rate detection device 135, which is connected in series with the pressure relief valve 140 and is configured to detect a second flow rate through the pressure relief valve 140. The controller 200 is further configured to generate a second fault message when the second flow rate detected by the second flow rate detection device 135 indicates that the current flow rate exceeds a second preset flow rate threshold, and transmit the second fault message to the notification device 300. This second fault message serves to alert the user that the zero-pressure valve 131 has failed. As described above, when the zero-pressure valve 131 fails, the pressure relief valve 140 opens, reducing the pressure of the purified water to below 0.1 MPa. In this case, a large amount of purified water is discharged to the drain 103. When the flow rate through the pressure relief valve 140 is detected to be greater than a preset value, the zero-pressure valve 131 is determined to be faulty, and the second fault message is generated. If the water purifier includes both a reverse osmosis filter element and a nanofiltration filter element, the central filter element 112 will produce a certain proportion of concentrated water, which can also be discharged from the drain 103 via the concentrated water solenoid valve 170. Therefore, when the second flow rate detection device 135 detects a significant change in the second flow rate, the controller 200 can determine that the zero-pressure valve 131 has failed and generate a second fault message. The prompt device 300 can prompt the user to repair the water purifier, such as replacing the zero-pressure valve 131, to avoid wasting a large amount of purified water.

[0060] The water purifier can also flush the central filter element 112 by opening the concentrate solenoid valve 170. In this case, a large amount of water will also be discharged through the drain port 103. To prevent the controller 200 from misjudging this, the second water flow detection device 135 can be positioned between the outlet of the pressure relief valve 140 and the outlet of the concentrate solenoid valve 170, and the concentrate from the concentrate solenoid valve 170 can be prevented from passing through the second water flow detection device. Alternatively, the acquisition of the second flow rate information from the second water flow detection device 135 can be stopped when the concentrate solenoid valve 170 is open.

[0061] Exemplarily, the water purifier further includes a smart faucet 160 connected to the hot water outlet 102, and the prompt device 300 includes a display device provided on the smart faucet 160. The user can use the display device of the smart faucet 160 to determine whether the input target water volume and / or target water temperature is correct. When a malfunction occurs in the water purifier, the first or second malfunction information sent by the controller 200 can be displayed on the water purifier or the smart faucet 160 in the form of a code or other text. The user can obtain this information through the display device on the smart faucet 160. Thus, the water purifier body does not need to be provided with the prompt device 300, and the user can obtain the above information without having to check the water purifier body. In this way, when a malfunction occurs in the water purifier, the user can detect it in time and it is not easy to miss it. Furthermore, not providing the prompt device 300 on the water purifier body can reduce the cost of the water purifier and make the water purifier more flexible in installation, such as installing it under a cabinet or installing it with any side facing the wall, without having to consider whether the side with the prompt device 300 is facing the user during installation.

[0062] Exemplarily, the water purifier also includes a booster pump 111 and a return pipe 120. The booster pump 111 is arranged in series between the raw water inlet 101 and the filter assembly 110. The water inlet of the return pipe 120 is connected to the water outlet of the filter assembly 110, and the water outlet of the return pipe 120 is connected to the water inlet of the booster pump 111. A return valve 121 is provided on the return pipe 120. The return valve 121 is constructed to open when the pressure at its water inlet is greater than or equal to a second preset pressure threshold, and the second preset pressure threshold is less than the rated pressure of the zero-pressure valve 131.

[0063] For a water purifier in which the filter assembly 110 includes a booster pump 111, the booster pump 111 can pressurize the raw water to 0.7-0.8 MPa, thereby reaching a pressure at which the above-mentioned central filter element 112 can operate. For example, for a zero-pressure valve 131 with a rated pressure of 0.6 MPa, the pressure at the pure water port 112b of the central filter element 112 is lower than the pressure at its raw water port 112a, but is still above the rated pressure of 0.6 MPa of the zero-pressure valve 131. When the zero-pressure valve 131 operates at a pressure greater than the rated pressure, the risk of failure of the zero-pressure valve 131 increases, and the service life may be shortened. In order to extend the service life of the zero-pressure valve 131, the pressure at the water inlet of the zero-pressure valve 131 can usually be made around 0.4 MPa. To this end, a reflux line 120 can be provided between the pure water port 112b of the central filter element 112 and the water inlet of the booster pump 111, and a reflux valve 121 is provided on the reflux line 120, so that when the pressure at the pure water port 112b of the central filter element 112 is greater than 0.4MPa, the excess clean water is refluxed to the upstream of the booster pump 111 and re-participates in water production. In other words, the function of the reflux valve 121 is similar to that of the pressure relief valve 140 described above, both of which are opened when the water inlet pressure is greater than the pressure threshold and release the pressure to the pipeline connected to the water outlet. The pressure upstream of the booster pump 111 is generally approximately equal to the tap water pressure (0.24Mpa), so after the reflux line 120 is provided, the water pressure acting on the zero-pressure valve 131 is usually less than 0.4MPa, thereby extending the service life of the zero-pressure valve 131. In some other embodiments, the rated pressure of the zero-pressure valve 131 may be larger or smaller. For example, the rated pressure of the zero-pressure valve 131 may be greater than the maximum pressure of the boost pump 111. Therefore, if the filter assembly 110 and the pipeline can withstand sufficient pressure, there is no need to set the return pipeline 120.

[0064] like Figure 2As shown, illustratively, the water purifier may further include a cold water outlet 104 and a cold water pipe 150 connected between the cold water outlet 104 and the filter assembly 110. The aforementioned solenoid valve may include a hot water solenoid valve 134, which is connected in series upstream of the zero-pressure valve 131 and in parallel with the cold water pipe 150. The water purifier may be provided with a cold water pipe 150 connected to the water outlet of the filter assembly 110, and a cold water solenoid valve 151 may be provided on the cold water pipe 150, so as to deliver unheated purified water to the cold water outlet 104 for use by the user according to the needs of the user. In the event that the zero-pressure valve 131 fails and the pressure relief valve 140 releases pressure, the water pressure at the water outlet of the filter assembly 110 may drop to below 0.1 MPa, which will seriously affect the outlet flow rate of the cold water. Therefore, a hot water solenoid valve 134 can be connected in series between the water inlet of the zero-pressure valve 131 and the water outlet of the filter assembly 110. Even if the zero-pressure valve 131 fails, the hot water solenoid valve 134 can be closed to ensure the normal supply of cold water and the user experience.

[0065] Exemplarily, the water purifier includes a temperature detection device disposed on the heating pipe 1332. The controller 200 is configured to close the solenoid valve when the temperature information from the temperature detection device indicates that the current temperature has reached a preset temperature. The preset temperature may include multiple temperatures, such as the dry-boil temperature, and reaching the preset temperature may include being above a certain preset temperature. In other embodiments, a separate temperature detection device may be disposed only downstream of the heating pipe 1332. In this case, reaching the preset temperature may include being below a certain preset temperature. Alternatively, temperature detection devices may be disposed on and downstream of the heating pipe 1332. The purpose of the temperature detection device will be described in more detail later. The connection between the water outlet of the zero-pressure valve 131 and the flow control pump 1331, the connection between the flow control pump 1331 and the heating pipe 1332 (the reference numerals for the connection pipes are not indicated), and the connection between the heating pipe 1332 and the hot water outlet 102 may all utilize connection pipes 1301 and 1302 having a first pressure-bearing capacity. Therefore, all three sections of the connection pipes may leak. In an exemplary embodiment, the temperature detection device may include a first temperature detection device (not shown) disposed on the heating pipe 1332 and a second temperature detection device 161 disposed downstream of the heating pipe 1332. When the zero-pressure valve 131 and the pressure relief valve 140 fail simultaneously, the following three situations may occur:

[0066] 1. The connecting pipe 1301 between the water outlet of the zero-pressure valve 131 and the flow control pump 1331 falls off or breaks;

[0067] 2. The connecting pipe (not shown) between the flow control pump 1331 and the heating pipe 1332 falls off or breaks;

[0068] 3. The connecting pipe 1302 between the heating pipe 1332 and the hot water outlet 102 falls off or breaks.

[0069] Since the pressure at the other two locations will drop sharply if any connecting pipe falls off or breaks, it is almost impossible for two or more connecting pipes to fall off or break. After the connecting pipe falls off or breaks, the supply of clean water is greatly reduced or cut off. During the heating process of the heating module 133, the temperature in the waterway downstream of the falling or broken location will increase abnormally, decrease, or remain unchanged. The controller 200 can determine the location of the falling or breaking by the different locations where the temperature abnormality occurs, generate different fault information, and promptly control the heating module 133 to stop working and control the solenoid valve to close.

[0070] In the first two of the three scenarios described above, since the water flow entering the heating tube 1332 will be significantly reduced, the temperature of the heating tube 1332 will rise sharply due to dry-boiling when it is heated. In this case, the controller 200 can determine, based on the first temperature information detected by the first temperature detection device, that the current temperature is higher than the preset dry-boiling temperature, thereby controlling the heating tube 1332 to stop heating and simultaneously shutting off the water supply. The first temperature detection device can include one or more of a thermocouple, a thermal resistor, and a temperature-controlled switch. Taking a temperature-controlled switch as an example, the operating temperature of the temperature-controlled switch may vary depending on the model. For example, if the operating temperature of the temperature-controlled switch is 125°C, when the temperature of the heating tube 1332 reaches 125°C, the temperature-controlled switch will activate, thereby shutting off the circuit of the heating tube 1332 and preventing the temperature of the heating tube 1332 from rising further. The controller 200 can also detect the activation of the temperature-controlled switch through a circuit connected to the temperature-controlled switch and control the solenoid valve to close, thereby shutting off the water supply to the heating module 133. For thermocouples or thermal resistors, the controller 200 needs to process the electrical signal generated by them to obtain the current temperature and compare it with the preset dry-burning temperature set in the controller 200. When the current temperature is higher than the preset dry-burning temperature, the solenoid valve is controlled to close.

[0071] The second temperature detection device 161 can be located near the hot water outlet 102, for example, on the smart faucet 160. In some embodiments, the water purifier is connected to a heating faucet. In this case, the temperature detection device at the water inlet, water outlet, or heating element of the heating faucet can serve as the second temperature detection device 161. If the zero-pressure valve 131 fails, the connecting pipe 1302 between the heating pipe 1332 and the hot water outlet 102 may fall off or break. If the water purifier includes various faucets described above so that various faucets serve as the hot water outlet 102, the connecting pipe 1302 between the heating pipe 1332 and the hot water outlet 102 is typically connected between the heating pipe 1332 and the faucet. In this case, the water heated by the heating pipe 1332 cannot reach the location where the second temperature detection device 161 is located. At this time, the temperature measured by the second temperature detection device 161 is close to room temperature and lower than the target water intake temperature input by the user. The controller 200 can determine whether the heating pipe 1332 is working and, if the heating pipe 1332 is working, compare the current temperature represented by the second temperature information with the target water intake temperature. If the current temperature indicated by the second temperature information is close to the target water intake temperature, the controller 200 determines that the water purifier is normal. Conversely, if the controller 200 determines that the current temperature indicated by the second temperature information is lower than the preset target water intake temperature, it can be determined that at least the heating pipe 1332 has a problem, or the connecting pipe 1302 between the heating pipe 1332 and the hot water outlet 102 or the connecting pipe upstream thereof may be detached or broken.

[0072] Illustratively, the aforementioned solenoid valve includes a water inlet solenoid valve 180, which is connected in series between the raw water inlet 101 and the filter assembly 110. As mentioned above, since the raw water inlet 101 is typically connected to municipal tap water, which has a certain pressure. When using filter elements such as reverse osmosis filters or nanofiltration filters, which have a concentrate outlet, the provision of the water inlet solenoid valve 180 can prevent the waste of raw water from flowing out of the concentrate outlet when the water purifier is not operating. The water inlet solenoid valve 180 can be opened when a user draws water. In the event of failure of the water purifier's zero-pressure valve 131 and pressure relief valve 140, the controller 200 can control the water inlet solenoid valve 180 to close, thereby shutting off the water supply. A pre-filter 190 can be installed between the water inlet solenoid valve 180 and the raw water inlet 101 to perform preliminary filtration of the raw water, preventing large particles such as sand and gravel from damaging the water inlet solenoid valve 180 and extending the service life of the subsequent filter assembly 110.

[0073] 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", "horizontal", "vertical", "vertical", "horizontal", "top", "bottom", etc. are usually based on the directions or positional relationships shown in the accompanying drawings. They 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. Therefore, they 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 outline of each component itself.

[0074] For ease of description, area-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 figures and other components or features. It should be understood that area-relative terms include not only the orientation of the components as described in the figures, but also different orientations in use or operation. For example, if the components in the drawings are inverted as a whole, the situation where the components are "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". Thus, the exemplary term "above" may include both the orientations "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 document is intended to include all of these situations.

[0075] 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 invention. 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, they indicate the presence of features, steps, operations, parts, components and / or combinations thereof.

[0076] It should be noted that the terms "first," "second," and the like in the specification and claims of the present invention and the accompanying drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or precedence. It should be understood that the terms used in this manner are interchangeable where appropriate, such that the embodiments of the present invention described herein can be implemented in an order other than that illustrated or described herein.

[0077] The present invention has been described through the above embodiments. However, it should be understood that the above embodiments are for illustrative and illustrative purposes only and are not intended to limit the present invention to the described embodiments. Furthermore, those skilled in the art will appreciate that the present invention is not limited to the above embodiments and that various variations and modifications may be made based on the teachings of the present invention, all of which fall within the scope of the present invention. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A water purifier having a raw water inlet, a hot water outlet and a drain outlet, characterized in that: include: A filter assembly and a zero-pressure valve are arranged in series, wherein the water inlet of the filter assembly is connected to the raw water inlet, and the water outlet of the filter assembly is connected to the water inlet of the zero-pressure valve; A heating module, the heating module comprising a heating pipe and a connecting pipe, the heating pipe is connected between the water outlet of the zero-pressure valve and the hot water outlet through the connecting pipe, the connecting pipe itself has a first bearing pressure, and the joint of the connecting pipe has a second bearing pressure; a pressure relief valve, wherein a water inlet of the pressure relief valve is connected to a water outlet of the zero-pressure valve, and a water outlet of the pressure relief valve is connected to a drain, and the pressure relief valve is configured to open when the pressure at its water inlet is greater than or equal to a preset pressure threshold, wherein the preset pressure threshold is not greater than any one of the first bearing pressure and the second bearing pressure.

2. The water purifier according to claim 1, characterized in that: The water purifier further includes a first flow detection device, the heating module further includes a flow control pump, the first flow detection device and the flow control pump are sequentially connected in series between the zero pressure valve and the heating tube along the water flow direction, the first flow detection device is used to detect the first flow information of the pipeline, the water purifier further includes a controller, The controller is used to control the working time of the flow control pump based on the first flow information so that the water intake at the hot water outlet reaches the target water intake; and / or The controller is used to control the pumping flow of the flow control pump and / or the power of the heating tube based on the first flow information, so that the water temperature at the hot water outlet reaches the target water intake temperature.

3. The water purifier according to claim 2, characterized in that: The water inlet of the pressure relief valve is connected to the pipeline between the zero-pressure valve and the first flow detection device.

4. The water purifier according to claim 2, characterized in that: The water purifier also includes a solenoid valve, which is connected in series with the filter assembly and located upstream of the zero-pressure valve. The controller is used to control the solenoid valve to disconnect when the first flow information indicates that the current flow is greater than a first flow threshold.

5. The water purifier according to claim 1, characterized in that: The water purifier also includes: A solenoid valve, the solenoid valve is connected in series with the filter assembly and is located upstream of the zero-pressure valve; A temperature detection device disposed on the heating tube and / or downstream of the heating tube; and A controller is used to close the solenoid valve when the temperature information detected by the temperature detection device indicates that the current temperature reaches a preset temperature.

6. The water purifier according to claim 4 or 5, characterized in that: The water purifier further comprises a prompting device, and the controller is further configured to generate first fault information and send the first fault information to the prompting device when the solenoid valve is disconnected.

7. The water purifier according to claim 6, characterized in that: The water purifier also includes a smart faucet connected to the hot water outlet, and the prompt device includes a display device arranged on the smart faucet.

8. The water purifier according to claim 1, characterized in that: The water purifier comprises a second flow detection device, a prompting device and a controller, wherein the second flow detection device is connected in series with the pressure relief valve and is used to detect second flow information flowing through the pressure relief valve; The controller is also used to generate second fault information and send it to the prompt device when the second flow information indicates that the current flow is greater than a second preset flow threshold.

9. The water purifier according to claim 8, characterized in that: The water purifier also includes a smart faucet connected to the hot water outlet, and the prompt device includes a display device arranged on the smart faucet.

10. The water purifier according to claim 1, characterized in that: The water purifier also includes: A booster pump and a return line, wherein the booster pump is arranged in series between the raw water inlet and the filter assembly, the water inlet of the return line is connected to the water outlet of the filter assembly, the water outlet of the return line is connected to the water inlet of the booster pump, and a return valve is arranged on the return line, and the return valve is configured to open when the pressure at its water inlet is greater than or equal to a second preset pressure threshold, and the second preset pressure threshold is less than the rated pressure of the zero-pressure valve; and / or A cold water outlet, a cold water pipeline connected between the cold water outlet and the water outlet of the filter assembly, and a hot water solenoid valve, wherein the hot water solenoid valve is connected in series upstream of the zero-pressure valve and in parallel with the cold water pipeline.

Images