Water purification system and water purifier

Abstract

The utility model provides a water purification system and a water purifier, the water purification system comprises a front filter assembly, a first reverse osmosis filter element and a second reverse osmosis filter element, a water inlet of the front filter assembly is communicated with a water source; the first reverse osmosis filter element comprises a first water inlet, a first wastewater outlet and a first pure water outlet, and the first water inlet is communicated with the water outlet of the front filter assembly; the second reverse osmosis filter element comprises a second water inlet and a second pure water outlet, the second water inlet is communicated with the first wastewater outlet, and the second pure water outlet is communicated with the first water inlet; wherein a first drainage valve is connected between the first wastewater outlet and the second water inlet, a water outlet of the first drainage valve is communicated with the outside, and the first drainage valve is configured to be opened when the first pure water outlet stops taking water and closed after the preset drainage amount is completed. According to the utility model, the technical problem of high TDS of the first cup of water under the high recovery rate of the water purification system can be improved.

Description

Technical Field

[0001] This utility model relates to the field of water purification equipment technology, specifically to a water purification system and a water purifier. Background Technology

[0002] As people become more health-conscious, the requirements for point-of-use water purification equipment are increasing, and high-flow-rate water purifiers are gradually becoming a development trend in the water purification industry. Due to the inherent characteristics of the reverse osmosis filter element, the TDS (Total Dissolved Solids) of the first cup of water consumed by a user after a period of standby or shutdown will be significantly higher, which is detrimental to drinking water health.

[0003] In order to save water and reduce wastewater discharge, current water purification systems often need to meet a high recovery rate. However, a high recovery rate will further accelerate the fouling and scaling of the reverse osmosis membrane, resulting in a further increase in the TDS value of the first cup of water. Utility Model Content

[0004] In view of the problems existing in the prior art, the present invention provides a water purification system and water purifier, which can improve the technical problem of high TDS in the first cup of water under high recovery rate of water purification system.

[0005] To achieve the above and other related objectives, the present invention provides a water purification system comprising a pre-filter assembly, a first reverse osmosis filter element, and a second reverse osmosis filter element. The inlet of the pre-filter assembly is connected to a water source. The first reverse osmosis filter element includes a first inlet, a first wastewater outlet, and a first pure water outlet, with the first inlet connected to the outlet of the pre-filter assembly. The second reverse osmosis filter element includes a second inlet and a second pure water outlet, with the second inlet connected to the first wastewater outlet and the second pure water outlet connected to the first inlet. A first drain valve is connected between the first wastewater outlet and the second inlet, with the outlet of the first drain valve connected to the outside. The first drain valve is configured to open when the first pure water outlet stops drawing water and close after a preset drainage volume is completed.

[0006] The beneficial effects of this setup are as follows: By installing a second reverse osmosis filter element and connecting the second inlet to the first wastewater outlet and the second pure water outlet to the first inlet, a high recovery rate of the water purification system can be achieved, reducing wastewater discharge. Simultaneously, because a first drain valve connects the first wastewater outlet and the second inlet, with its outlet open to the outside, and configured to open when the first pure water outlet stops drawing water and close after completing a preset drainage volume, when the first pure water outlet stops drawing water, opening the first drain valve allows the high-concentration wastewater from the first wastewater outlet side to be released to the outside of the water purification system. This reduces the concentration of raw water entering the second reverse osmosis filter element, thereby reducing the concentration of raw water returning to the first inlet side. This reduces the probability of contamination and scaling of the second reverse osmosis filter element, improves the wastewater recovery rate, and extends the replacement frequency and service life of the second reverse osmosis filter element. Simultaneously, it can improve the water quality on the second inlet side, reducing the probability of the first reverse osmosis filter cartridge becoming contaminated during soaking during prolonged standby or shutdown, thereby improving and reducing the problem of high TDS values ​​in the first cup of water after prolonged standby or shutdown. It can also extend the replacement frequency and lifespan of the first reverse osmosis filter cartridge.

[0007] In one embodiment of this utility model, the membrane flux of the second reverse osmosis filter element is less than that of the first reverse osmosis filter element.

[0008] The advantages of this setup are: the first reverse osmosis filter cartridge is mainly used for water production, and a larger flow rate helps to ensure the flow rate of pure water produced; the second reverse osmosis filter cartridge is mainly used for the recycling and filtration of wastewater from the first reverse osmosis filter cartridge, so a smaller flow rate is used, which helps to save on the replacement cost of the second reverse osmosis filter cartridge.

[0009] In one embodiment of this utility model, the preset drainage volume is 200-300ml.

[0010] The benefits of this setting are that by setting the preset drainage volume in the range of 200-300ml, the TDS value requirement of the first cup of water can be met, while also taking into account the recovery rate requirement of the water purification system.

[0011] In one embodiment of this utility model, the first drain valve is a flow solenoid valve.

[0012] The beneficial effects of this setting are: by setting the flow solenoid valve, the flow rate of the first drain valve can be accurately determined. Combined with the required preset drainage volume, the opening time of the first drain valve can be calculated. Thus, by controlling the opening time of the first drain valve, the preset drainage volume at the first drain valve can be accurately controlled.

[0013] In one embodiment of the present invention, the first wastewater outlet and the second water inlet are connected by a second drain valve, and the second drain valve is disposed between the first drain valve and the second water inlet.

[0014] The beneficial effects of this setup are as follows: By installing a second drain valve, the on / off control of the first wastewater pipeline can be achieved, which facilitates partial maintenance and replacement of the water purification system. This reduces the probability of cross-contamination between the inlet pipeline, pure water pipeline, and first wastewater pipeline during the replacement of the first or second reverse osmosis filter element, thereby reducing the probability of the pure water pipeline being contaminated.

[0015] In one embodiment of the present invention, the second drain valve is configured to remain closed when the first drain valve is open, and to remain open when the first drain valve is closed.

[0016] The beneficial effects of this configuration are as follows: This configuration enables coordinated control between the first and second drain valves. When the first drain valve is open, the second drain valve is closed, preventing highly concentrated wastewater from the first wastewater outlet from entering the second inlet and contaminating the first reverse osmosis filter element. Conversely, when the first drain valve is closed, the second drain valve remains open, reducing the probability of malfunction of the first drain valve when the second drain valve is open, thus ensuring the normal operation of the water purification system.

[0017] In one embodiment of this utility model, both the first drain valve and the second drain valve are electrically controlled valves.

[0018] The advantages of this setup are as follows: Since the electrically controlled valves can be remotely controlled via electronic signals, it facilitates the automated control of both the first and second drain valves. Furthermore, the rapid response and precise control of the electrically controlled valves allow the first and second drain valves to open and close quickly and accurately, thus ensuring the stability and reliability of the water purification system control.

[0019] In one embodiment of the present invention, the water purification system further includes a booster pump, the inlet of which is connected to the outlet of the pre-filter assembly and the second pure water outlet, and the outlet of which is connected to the first inlet.

[0020] The beneficial effects of this setup are as follows: by installing a booster pump on the inlet pipe, the booster pump can pressurize the water filtered by the pre-filter before it is introduced into the first reverse osmosis filter element, thereby increasing the pre-membrane pressure of the first reverse osmosis filter element and ensuring the filtration effect.

[0021] In one embodiment of this utility model, the water purification system further includes a pure water return pipeline. The first pure water outlet is unidirectionally connected to the inlet of the booster pump through the pure water return pipeline. When the first pure water outlet stops taking water and the booster pump continues to run for a preset time, the pure water in the pure water pipeline can return to the inlet of the booster pump.

[0022] The beneficial effects of this setting are as follows: when the tap at the pure water outlet is closed, that is, when water intake stops, the booster pump continues to run for the preset time. The pure water in the pure water pipeline can flow back to the inlet of the booster pump, and then back to the first inlet, so that the membrane of the first reverse osmosis filter element is immersed in the pure water environment. This can improve the problem of the TDS value of the first cup of water taken after a long standby time being too high.

[0023] In one embodiment of this utility model, the preset duration for the booster pump to continue operating is 50 to 70 seconds.

[0024] The beneficial effects of this setting are: setting the preset duration of the booster pump's continued operation to 50-70 seconds ensures that after the first pure water outlet stops drawing water, the first inlet will receive a sufficient amount of pure water to meet the pure water immersion area requirements of the first reverse osmosis filter element, while also preventing the booster pump from running for too long, thus avoiding energy waste.

[0025] In one embodiment of the present invention, the water purification system further includes a second wastewater pipeline, and the second reverse osmosis filter element further includes a second wastewater outlet; the second wastewater pipeline is connected to the second wastewater outlet, and a third drain valve is connected to the second wastewater pipeline. The outlet of the third drain valve is connected to the outside, and the third drain valve is configured to continue to discharge a preset amount of wastewater after the water purification system is shut down.

[0026] The beneficial effects of this setup are as follows: After shutdown, it reduces the amount of concentrate stored inside the second reverse osmosis filter element, effectively reducing the probability of scale buildup due to prolonged immersion in concentrate, thus extending the filter element's replacement cycle and lifespan. Simultaneously, because the water level in the second reverse osmosis filter element is reduced on the second wastewater outlet side, the corresponding pressure also decreases. This reduces the probability of concentrate from the second reverse osmosis filter element entering the pure water pipeline, thereby reducing the contamination of the first reverse osmosis filter element. This not only ensures the effectiveness of the pure water immersion of the first reverse osmosis filter element and reduces the probability of scale buildup, but also further ensures the water quality of the first cup of water at the first pure water outlet.

[0027] In one embodiment of this utility model, the preset wastewater volume is 300-400ml.

[0028] The beneficial effects of this setting are as follows: Setting the preset wastewater discharge volume of the third drain valve after the water purification system is shut down to within the range of 300-400ml not only ensures that the concentrated water in the second reverse osmosis filter is less likely to enter the pure water pipeline during long-term shutdown, reducing the probability of water quality contamination at the first pure water outlet and ensuring the quality of the first cup of water, but also facilitates the wastewater to flow out under the internal pressure after the water purification system is shut down, maintaining a reasonable internal pressure value and reducing internal pressure fluctuations after the next startup, thereby helping to protect the first and second reverse osmosis filter elements.

[0029] In one embodiment of this utility model, an inlet valve is also provided between the pre-filter assembly and the water source. The inlet end of the inlet valve is connected to the water source, and the outlet end of the inlet valve is connected to the inlet of the pre-filter assembly.

[0030] The beneficial effects of this setup are as follows: by installing an inlet valve on the inlet pipe, the raw water flowing in from the inlet pipe must pass through the inlet valve before flowing into the pre-filter assembly. This allows the flow rate of raw water entering the water purification system to be controlled by the inlet valve. In turn, by controlling the inlet flow rate, damage to the booster pump or the entire filtration system due to insufficient flow or unstable pressure can be prevented.

[0031] In one embodiment of the present invention, the water purification system further includes a housing, and the pre-filter assembly and the second reverse osmosis filter element are both installed inside the housing.

[0032] The advantages of this design are as follows: by fixing both the pre-filter assembly and the second reverse osmosis filter element inside the housing, the pre-filter assembly and the second reverse osmosis filter element can be integrated and installed. The pre-filter assembly and the second reverse osmosis filter element can be disassembled and installed simultaneously by disassembling the housing, thus facilitating the replacement and maintenance of the pre-filter assembly and the second reverse osmosis filter element.

[0033] In a second aspect, this utility model also provides a water purifier, which includes the water purification system in any of the above embodiments. Attached Figure Description

[0034] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other embodiments can be obtained based on these drawings without creative effort.

[0035] Figure 1 This is a schematic diagram of the pipeline connection in one embodiment of the water purification system of this utility model;

[0036] Figure 2 This is a schematic diagram of the pipeline connection in another embodiment of the water purification system of this utility model;

[0037] Figure 3 This is a schematic diagram of the pipeline connection in one embodiment of the water purifier of this utility model.

[0038] Component designation explanation:

[0039] 100. Water purification system; 110. Inlet pipe; 111. Pre-filter assembly; 112. First reverse osmosis filter element; 1121. First inlet; 1122. First pure water outlet; 1123. First wastewater outlet; 113. Booster pump; 114. Inlet valve; 120. Pure water pipe; 121. Faucet; 130. First wastewater pipe; 131. First drain valve; 132. Second drain valve; 133. Second reverse osmosis filter element; 1331. Second inlet; 1332. Second pure water outlet; 1333. Second wastewater outlet; 140. Pure water return pipe; 141. Check valve; 150. Second wastewater pipe; 151. Third drain valve; 160. Housing; 200. Water purifier; 210. Control panel. Detailed Implementation

[0040] The following specific examples illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. This utility model can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this utility model. It should be noted that, in the absence of conflict, the following embodiments and features in the embodiments can be combined with each other. It should also be understood that the terminology used in the embodiments of this utility model is for describing specific implementation schemes and not for limiting the scope of protection of this utility model. Test methods in the following embodiments that do not specify specific conditions are generally performed under conventional conditions or according to the conditions recommended by the respective manufacturers.

[0041] When numerical ranges are given in the embodiments, it should be understood that, unless otherwise specified in this invention, both endpoints of each numerical range and any value between the two endpoints may be selected. Unless otherwise defined, all technical and scientific terms used in this invention, as well as the prior art known to those skilled in the art and the description of this invention, may be implemented using any prior art methods, equipment, and materials similar to or equivalent to those in the embodiments of this invention.

[0042] It should be noted that the terms such as "upper", "lower", "left", "right", "middle" and "one" used in this specification are only for clarity of description and are not intended to limit the scope of implementation of this utility model. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered as within the scope of implementation of this utility model.

[0043] Please see Figures 1 to 3 This utility model provides a water purification system 100 and a water purifier 200. The water purification system 100 is provided with a first drain valve 131 between the wastewater outlet of the first reverse osmosis filter element 112 and the water inlet of the second reverse osmosis filter element 133. By controlling the opening and closing of the first drain valve 131, the technical problem of high TDS value of the first cup of water under high recovery rate of the water purification system 100 can be improved.

[0044] Please see Figure 1 The water purification system 100 of this utility model includes a pre-filter assembly 111, a first reverse osmosis filter element 112, and a second reverse osmosis filter element 133. The inlet of the pre-filter assembly 111 is connected to a water source. Depending on the installation position of the inlet of the pre-filter assembly 111 and the water source, they can be connected via a pipe or directly. The water source can be tap water, groundwater, well water, or any potable water. In this embodiment, the water source is tap water. The pre-filter assembly 111 is used for the first coarse filtration of the tap water, filtering out large particles such as sediment, rust, insect eggs, and red worms. The pre-filter assembly 111 can be a composite filter element structure, which helps to reduce the volume of the water purification system 100. Preferably, the pre-filter assembly 111 is a composite filter element structure of PP cotton and activated carbon. Of course, the pre-filter assembly 111 can also be two separate filter elements: PP cotton and activated carbon; this is not limited here.

[0045] The first reverse osmosis filter element 112 includes a first inlet 1121, a first pure water outlet 1122, and a first wastewater outlet 1123. The first inlet 1121 is connected to the outlet of the pre-filter assembly 111. The first inlet 1121 can be directly connected to the outlet of the pre-filter assembly 111, or it can be connected via a pipe. The second reverse osmosis filter element 133 includes a second inlet 1331, a second pure water outlet 1332, and a second wastewater outlet 1333. The second inlet 1331 is connected to the first wastewater outlet 1123, and the second pure water outlet 1332 is connected to the first inlet 1121. Thus, the concentrated water formed after filtration by the first reverse osmosis filter element 112 flows back into the second reverse osmosis filter element 133 for further filtration, thereby achieving a high recovery rate in the water purification system 100.

[0046] The specific positions and distances between the first reverse osmosis filter element 112, the second reverse osmosis filter element 133, and the pre-filter assembly 111, as well as whether pipes are installed between them, are not specifically limited, as long as the water purification requirements of the water purification system 100 are met.

[0047] Specifically, in this embodiment, please refer to Figure 1 The water purification system 100 also includes an inlet pipe 110, a pure water pipe 120, and a first wastewater pipe 130. The two ends of the inlet pipe 110 are connected to a water source and a first inlet 1121, respectively, and a pre-filter assembly 111 is installed on the inlet pipe 110. Water from the water source flows into the first inlet 1121 after being filtered by the pre-filter assembly 111, and a second pure water outlet 1332 is connected to the inlet pipe 110. One end of the pure water pipe 120 is connected to the first pure water outlet 1122, and the other end is a purified water intake. A faucet 121 can also be installed at the purified water intake for convenient water dispensing. The two ends of the first wastewater pipe 130 are connected to a first wastewater outlet 1123 and a second inlet 1331, respectively.

[0048] A first drain valve 131 is connected between the first wastewater outlet 1123 and the second inlet 1331, meaning the first drain valve 131 is installed on the first wastewater pipeline 130. The inlet of the first drain valve 131 is connected to the first wastewater outlet 1123, and the outlet of the first drain valve 131 is connected to the outside environment, such as a wastewater collection tank or a sewage discharge pipe. The first drain valve 131 is configured to open when the pure water outlet of the first reverse osmosis filter element 112 stops drawing water, i.e., when the faucet 121 on the pure water pipeline 120 is closed; and to close after the first drain valve 131 has completed a preset drainage volume. The first drain valve 131 can be a manual valve, allowing manual control of its opening and closing. Alternatively, the first drain valve 131 can be a solenoid valve, which controls the opening and closing of the valve through electromagnetic action, thus achieving automatic opening and closing of the first drain valve 131. The first drain valve 131 can also be an electric ball valve, which is driven by an electric actuator to automatically open and close. Optionally, in this embodiment, the first drain valve 131 is a solenoid valve. The control structure and method for opening and closing the solenoid valve can be found in the relevant descriptions in existing solenoid valve structures, and will not be repeated here. By using a solenoid valve, the first drain valve 131 can be automatically opened and closed, which is convenient and simple to operate.

[0049] Because a first drain valve 131 is installed on the first wastewater pipeline 130, when the first pure water outlet 1122 stops taking water, by opening the first drain valve 131, the concentrated water generated during the filtration process of the first reverse osmosis filter element 112 can be discharged to the outside of the first wastewater pipeline 130 through the first drain valve 131. This can reduce the concentration of the raw water entering the second inlet 1331, reduce the probability of pollution and scaling of the second reverse osmosis filter element 133, reduce the water quality pollution on the side of the second pure water outlet 1332, and thus reduce the concentration of the influent water flowing back to the first inlet 1121 side of the first reverse osmosis filter element 112. This reduces the probability of pollution and scaling of the first reverse osmosis filter element 112 during soaking in a long-term standby or shutdown state, thereby improving the problem of high TDS value of the first cup of water discharged from the first pure water outlet 1122 after a period of standby or shutdown. Meanwhile, by reducing the probability of fouling and scaling in the second reverse osmosis filter element 133, the second reverse osmosis filter element 133 can maintain a high filtration efficiency, reducing the amount of wastewater generated during the filtration process, which in turn helps maintain a high wastewater recovery rate during the operation of the water purification system 100. In addition, by reducing the probability of fouling and scaling in the first reverse osmosis filter element 112 and the second reverse osmosis filter element 133, the replacement frequency and service life of the first reverse osmosis filter element 112 and the second reverse osmosis filter element 133 can also be extended.

[0050] Please see Figure 1 In one embodiment of this utility model, the membrane flux of the second reverse osmosis filter element 133 is less than that of the first reverse osmosis filter element 112. The first reverse osmosis filter element 112 is mainly used for water production, and a larger flux is beneficial to ensuring the flow rate of pure water produced. The second reverse osmosis filter element 133 is mainly used for the recovery and filtration of wastewater from the first reverse osmosis filter element 112, so a smaller flux is used, which helps to save on the replacement cost of the second reverse osmosis filter element 133.

[0051] The amount of pre-set drainage completed when the first drain valve 131 is open affects the wastewater recovery rate and the TDS value of the first cup of water. Excessive pre-set drainage will decrease the recovery rate of the water purification system 100, but it will help reduce the TDS value of the first cup of water, ensuring its quality. Conversely, insufficient pre-set drainage will not help reduce the TDS value of the first cup of water, thus lowering its quality, but it will correspondingly increase the recovery rate of the water purification system 100. Therefore, in one embodiment of this invention, the pre-set drainage volume is set to 200-300 ml, for example, 200 ml, 250 ml, or 300 ml. Setting the pre-set drainage volume within the range of 200-300 ml satisfies both the TDS value requirement of the first cup of water and the recovery rate requirement of the water purification system 100.

[0052] To improve the precise control of the preset drainage volume when the first drain valve 131 is open, optionally, in one embodiment of this utility model, the first drain valve 131 is a flow solenoid valve. By setting the flow solenoid valve, the flow rate of the first drain valve 131 can be accurately determined. Combined with the preset drainage volume, the opening time of the first drain valve 131 can be calculated. Therefore, by controlling the opening time of the first drain valve 131, the preset drainage volume at the first drain valve 131 can be accurately controlled.

[0053] Please see Figure 2 In one embodiment of this utility model, a second drain valve 132 is further provided on the first wastewater pipeline 130. The inlet of the second drain valve 132 is connected to the first wastewater outlet 1123, and the outlet of the second drain valve 132 is connected to the second inlet 1331. When the second drain valve 132 is open, the first wastewater outlet 1123 is connected to the second inlet 1331; when the second drain valve 132 is closed, the first wastewater outlet 1123 is disconnected from the second raw water outlet. The second drain valve 132 is disposed on the pipe section between the first drain valve 131 and the second inlet 1331. The second drain valve 132 can be a manual valve or an automatic valve. Preferably, in this embodiment, the second drain valve 132 is an automatic valve, such as a solenoid valve, an electric ball valve, or any automatic valve structure that can realize automatic on / off control between the outlet of the second drain valve 132 and the second inlet 1331. By setting a second drain valve 132, the on / off control of the first wastewater pipeline 130 can be realized, so as to facilitate partial maintenance and replacement of the water purification system 100 and reduce the probability of cross-contamination between the inlet pipeline 110, the pure water pipeline 120 and the first wastewater pipeline 130 during the replacement of the first reverse osmosis filter element 112 or the second reverse osmosis filter element 133, thereby reducing the probability of the pure water pipeline 120 being contaminated.

[0054] Please see Figure 2, in an embodiment of the present utility model, the second drain valve 132 is configured to remain closed when the first drain valve 131 is open; and remain open when the first drain valve 131 is closed. Such a setting can achieve the interlocking control between the first drain valve 131 and the second drain valve 132. When the first drain valve 131 is open, closing the second drain valve 132 at this time can prevent the concentrated water with a higher concentration discharged from the first waste water outlet from entering the second raw water inlet and contaminating the first reverse osmosis filter element 112. And when the first drain valve 131 is closed, keeping the second drain valve 132 open can reduce the probability of misoperation of the first drain valve 131 when the second drain valve 132 is in the open state, which is beneficial to ensuring the normal operation of the water purification system 100. It should be noted that the specific structure of the interlocking control between the first drain valve 131 and the second drain valve 132 can refer to the relevant structure introductions of the interlocking control of multiple drain valves in the current technology, so it will not be elaborated here.

[0055] For the convenience of the interlocking control of the first drain valve 131 and the second drain valve 132, optionally, please refer to Figure 2 , in an embodiment of the present utility model, both the first drain valve 131 and the second drain valve 132 are electrically controlled valves. Specifically, the type of the electrically controlled valve can be a solenoid valve, an electric ball valve, etc. Since the electrically controlled valve can be remotely controlled through an electronic signal, it is convenient to realize the automatic control of the first drain valve 131 and the second drain valve 132. At the same time, due to the characteristics of fast response and precise control of the electrically controlled valve, the first drain valve 131 and the second drain valve 132 can be quickly and accurately opened and closed, so the stability and reliability of the control of the water purification system 100 can be ensured.

[0056] Please refer to Figure 1 and Figure 2 , in an embodiment of the present utility model, the water purification system 100 further includes a booster pump 113. The booster pump 113 is arranged on the water inlet pipe 110 and is located between the pre-filter assembly 111 and the first reverse osmosis filter element 112. The water inlet end of the booster pump 113 is connected to the water outlet of the pre-filter assembly 111, the water outlet end of the booster pump 113 is connected to the first water inlet 1121 of the first reverse osmosis filter element 112, and the second pure water outlet 1332 of the second reverse osmosis filter element 133 is also connected to the water inlet end of the booster pump 113. By arranging the booster pump 113 on the water inlet pipe 110, the booster pump 113 can pressurize the water filtered by the pre-filter assembly 111 and then introduce it into the first reverse osmosis filter element 112 to increase the pre-membrane pressure of the first reverse osmosis filter element 112 and ensure the filtration effect.

[0057] Please refer to Figure 1 and Figure 2In one embodiment of this utility model, the water purification system 100 further includes a pure water return pipeline 140. One end of the pure water return pipeline 140 is connected to the first pure water outlet 1122, and the other end of the pure water return pipeline 140 is connected to the inlet of the booster pump 113. A one-way valve 141 is also provided on the pure water return pipeline 140 to restrict the unidirectional flow of water, ensuring that pure water in the pure water return pipeline 140 can only flow from the first pure water outlet 1122 towards the inlet of the booster pump 113. In other words, the first pure water outlet 1122 and the inlet of the booster pump 113 are connected in one direction through the pure water return pipeline 140. With this configuration, when the tap 121 at the first pure water outlet 1122 is closed, that is, when water intake stops, the booster pump 113 continues to run for the preset time. The pure water in the pure water pipeline 120 can flow back to the inlet of the booster pump 113, and then back to the first inlet 1121 of the first reverse osmosis filter element 112, so that the membrane of the first reverse osmosis filter element 112 is immersed in a pure water environment, thereby improving the problem of excessively high TDS value when taking the first cup of water after a long standby time.

[0058] In one embodiment of this utility model, when the tap 121 at the first pure water outlet 1122 is closed, i.e., when water intake stops, the booster pump 113 continues to run for a preset duration of 50-70 seconds, for example, 50 seconds, 60 seconds, or 70 seconds. It should be noted that in this embodiment, after the booster pump 113 continues to run for the preset duration, the entire water purification system 100 enters a standby state. In this embodiment, setting the preset duration of the booster pump 113's continued operation to 50-70 seconds ensures that after the first pure water outlet 1122 stops taking water, sufficient pure water is supplied to the first inlet 1121 to meet the pure water immersion area requirements of the first reverse osmosis filter element 112, while also preventing the booster pump 113 from running for too long, thus avoiding energy waste.

[0059] Please see Figure 1 and Figure 2In one embodiment of this utility model, a second wastewater pipe 150 is provided at the second wastewater outlet 1333 of the second reverse osmosis filter element 133. One end of the second wastewater pipe 150 is connected to the second wastewater outlet 1333, and the other end of the second wastewater pipe 150 is connected to the outside, such as to a wastewater collection tank or a sewage pipe. A third drain valve 151 is connected to the second wastewater pipe 150. The second wastewater outlet 1333 is connected to or disconnected from the outside by opening or closing the third drain valve 151, thereby enabling the second wastewater outlet 1333 to switch between a draining state and a non-draining state. The third drain valve 151 is configured to discharge a preset amount of wastewater after the water purification system 100 is shut down. There are several ways to achieve the third drain valve 151 discharging a preset amount of wastewater after the water purification system 100 is shut down. For example, the third drain valve 151 can be a pressure valve, with its opening pressure being lower than the internal pressure of the water purification system 100 after shutdown, so that the third drain valve 151 can remain open after the water purification system 100 is shut down to continue draining. Alternatively, the third drain valve 151 can be an electrically controlled valve, extending the closing time of the third drain valve 151 to achieve continued draining after the water purification system 100 is shut down.

[0060] By configuring the third drain valve 151 to continue discharging a preset amount of wastewater after the water purification system 100 is shut down, this setting reduces the amount of concentrated water stored inside the second reverse osmosis filter element 133 after shutdown. This effectively reduces the probability of scale buildup in the second reverse osmosis filter element 133 due to prolonged immersion in concentrated water, extending the filter element's replacement cycle and service life. Simultaneously, because the water level in the second reverse osmosis filter element 133 decreases on the second wastewater outlet 1333 side, the corresponding pressure also decreases. This reduces the probability of concentrated water from the second reverse osmosis filter element 133 entering the pure water pipeline 120, thereby reducing the contamination of the first reverse osmosis filter element 112 by concentrated water. This not only ensures the effectiveness of the pure water immersion of the first reverse osmosis filter element 112 and reduces the probability of scale buildup, but also further ensures the water quality of the first cup of water at the first pure water outlet 1122.

[0061] Please see Figure 1 and Figure 2In one embodiment of this utility model, after the water purification system 100 is shut down, the preset wastewater volume discharged by the third drain valve 151 is 300-400ml, for example, 300ml, 350ml, or 400ml. Setting the preset wastewater volume discharged by the third drain valve 151 after the water purification system 100 is shut down within the range of 300-400ml not only ensures that the concentrated water in the second reverse osmosis filter element 133 is unlikely to enter the pure water pipeline 120 during long-term shutdown, reducing the probability of water quality contamination at the first pure water outlet 1122 and ensuring the quality of the first cup of water, but also facilitates the wastewater to flow out under the internal pressure of the water purification system 100 after shutdown, maintaining a reasonable internal pressure value of the water purification system 100, reducing pressure fluctuations in the pipeline after the next startup, thereby helping to protect the first reverse osmosis filter element 112 and the second reverse osmosis filter element 133.

[0062] To reduce the pressure impact of tap water on the components of the water inlet pipe 110 of the water purification system 100, and to reduce the risk of leakage and failure rate, in one embodiment of this utility model, please refer to... Figure 1 and Figure 2 An inlet valve 114 is also installed on the inlet pipe 110, and the inlet valve 114 is located at the front end of the inlet of the pre-filter assembly 111. That is, the inlet end of the inlet valve 114 is connected to the water source outlet, and the outlet end of the inlet valve 114 is connected to the inlet of the pre-filter assembly 111. By installing the inlet valve 114 on the inlet pipe 110, the raw water flowing in from the inlet pipe 110 must pass through the inlet valve 114 before flowing into the pre-filter assembly 111. In this way, the flow rate of raw water entering the water purification system 100 can be controlled by the inlet valve 114. In turn, by controlling the inlet flow rate, damage to the booster pump 113 or the entire filtration system due to insufficient flow or unstable pressure can be prevented.

[0063] Please see Figure 1 and Figure 2In one embodiment of this utility model, the water purification system 100 further includes a housing 160, within which the pre-filter assembly 111 and the second reverse osmosis filter element 133 are fixedly installed. The structural shape of the housing 160 is not limited, provided that the installation requirements of the pre-filter assembly 111 and the second reverse osmosis filter element 133 are met; for example, the housing 160 can be cylindrical, cuboid, etc. Inside the housing 160, the piping connections of the pre-filter assembly 111 and the second reverse osmosis filter element 133 are independent, and their filtration functions do not affect each other. By fixing the pre-filter assembly 111 and the second reverse osmosis filter element 133 within the housing 160, integrated installation of the pre-filter assembly 111 and the second reverse osmosis filter element 133 can be achieved. Disassembly of the housing 160 allows for simultaneous disassembly and installation of the pre-filter assembly 111 and the second reverse osmosis filter element 133, thus facilitating replacement and maintenance of the pre-filter assembly 111 and the second reverse osmosis filter element 133.

[0064] Please see Figure 3 This utility model also provides a water purifier 200, which includes a water purification system 100 as described in any of the above embodiments and a control panel 210. The control panel 210 can control the operation of the water purification system 100, such as the preparation of pure water. In this embodiment, the first drain valve 131, the second drain valve 132, the third drain valve 151, the inlet valve 114, and the booster pump 113 are all electrically connected to the control panel 210. By operating the control panel 210, the first drain valve 131, the second drain valve 132, the third drain valve 151, and the inlet valve 114 can be opened or closed, and the booster pump 113 can be started or stopped. The specific working conditions are as follows:

[0065] When a user draws water, the inlet valve 114, booster pump 113, first drain valve 131, and second drain valve 132 are opened via the control panel 210. Raw water flows in through the inlet pipe 110, is filtered by the pre-filter assembly 111, and then enters the first reverse osmosis filter element 112 through the first inlet 1121 under the action of the booster pump 113. The pure water filtered by the first reverse osmosis filter element 112 enters the pure water pipe 120 and flows out from the faucet 121 at the first pure water outlet 1122, allowing the user to draw water. Simultaneously, the concentrated water filtered by the first reverse osmosis filter element 112 enters the first wastewater pipe 130, flows through the second drain valve 132 into the second inlet 1331, and then enters the interior of the second reverse osmosis filter element 133. The pure water filtered by the second reverse osmosis filter element 133 enters the pure water pipe 120 and connects to the inlet of the booster pump 113, realizing the recycling of wastewater. The concentrated water filtered by the second drain valve 132 flows into the second wastewater pipeline 150 and is discharged to the outside of the water purification system 100 through the third drain valve 151.

[0066] After the user finishes drawing water and turns off the tap 121, the booster pump 113 continues to run. First, the first drain valve 131 is opened via the control panel 210, while the second drain valve 132 is closed. Concentrated water from the first wastewater outlet 1123 is discharged through the first drain valve 131 to the outside of the first wastewater pipeline 130. After the first drain valve 131 discharges a preset volume of 300ml, it is closed, and the second drain valve 132 is opened. The lower-concentration wastewater discharged from the first wastewater outlet 1123 continues to flow into the second inlet 1331. Since the high-concentration wastewater has already been discharged from the first drain valve 131, the concentration of wastewater entering the second inlet 1331 will be relatively low. This reduces the probability of contamination and scaling in the second reverse osmosis filter element 133, thereby reducing water pollution on the second pure water outlet 1332 side. This, in turn, reduces the concentration of the influent flowing back to the first inlet 1121 side of the first reverse osmosis filter element 112, reducing the probability of contamination and scaling in the first reverse osmosis filter element 112, and improving the problem of high TDS value in the first cup of water produced by the water purification system 100 after a period of standby.

[0067] Meanwhile, as the booster pump 113 continues to operate, the pure water flowing from the first pure water outlet 1122 enters the pure water return pipeline 140. At this time, the one-way valve 141 opens, and the pure water continues to flow back to the inlet of the booster pump 113. After being pressurized by the booster pump 113, it enters the first inlet 1121 and then enters the interior of the first reverse osmosis filter element 112, achieving pure water immersion of the first reverse osmosis filter element 112. At the same time, the low-density wastewater filtered by the first reverse osmosis filter element 112 enters the second inlet 1331 through the first wastewater pipeline 130 and then flows into the interior of the second reverse osmosis filter element 133, which can reduce the raw water concentration inside the second reverse osmosis filter element 133. After the booster pump 113 continues to run for 60 seconds, it stops running, the inlet valve 114 closes, and the water purification system 100 enters the standby state.

[0068] When the water purifier 200 needs to be shut down, the inlet valve 114 closes, the booster pump 113 stops running, and under the internal pressure of the water purification system 100, the third drain valve 151 remains open, slowly discharging 400ml of wastewater. Then, the third drain valve 151 closes, stopping wastewater discharge. This reduces the amount of concentrated water stored inside the second reverse osmosis filter element 133 after shutdown, effectively preventing scaling and extending the filter element's replacement cycle and lifespan. Simultaneously, because the water volume in the second reverse osmosis filter element 133 decreases on the second wastewater outlet 1333 side, the corresponding pressure also decreases. This reduces the probability of concentrated water from the second reverse osmosis filter element 133 entering the pure water pipeline 120, thus reducing contamination of the second reverse osmosis filter element 133. This not only ensures the effectiveness of the first reverse osmosis filter element 112's pure water soaking and reduces the probability of scaling on the first reverse osmosis filter element 112, but also further ensures the water quality of the first cup of water at the first pure water outlet 1122.

[0069] Therefore, this utility model effectively overcomes some practical problems in the prior art, thus having high utilization value and significance.

[0070] The above embodiments are merely illustrative of the principles and effects of this utility model and are not intended to limit the scope of this utility model. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this utility model. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.

Claims

1. A water purification system, characterized in that, include: A pre-filter assembly, wherein the inlet of the pre-filter assembly is connected to a water source; The first reverse osmosis filter element includes a first inlet, a first wastewater outlet, and a first pure water outlet, wherein the first inlet is connected to the outlet of the pre-filter assembly. The second reverse osmosis filter element includes a second water inlet and a second pure water outlet. The second water inlet is connected to the first wastewater outlet, and the second pure water outlet is connected to the first water inlet. A first drain valve is connected between the first wastewater outlet and the second inlet. The outlet of the first drain valve is connected to the outside. The first drain valve is configured to open when the first pure water outlet stops taking water and close after completing a preset drainage volume.

2. The water purification system of claim 1, wherein The membrane flux of the second reverse osmosis filter element is less than that of the first reverse osmosis filter element.

3. The water purification system of claim 1, wherein, The preset drainage volume is 200-300ml.

4. The water purification system of claim 1, wherein The first wastewater outlet is connected to the second water inlet via a second drain valve, and the second drain valve is located between the first drain valve and the second water inlet.

5. The water purification system of claim 4, wherein, The second drain valve is configured to remain closed when the first drain valve is open, and to remain open when the first drain valve is closed.

6. The water purification system according to claim 1 or 4, characterized in that The water purification system also includes a booster pump, the inlet of which is connected to the outlet of the pre-filter assembly and the second pure water outlet, and the outlet of which is connected to the first inlet.

7. The water purification system of claim 6, wherein The water purification system also includes a pure water return pipeline. The first pure water outlet is unidirectionally connected to the inlet of the booster pump through the pure water return pipeline. When the first pure water outlet stops taking water and the booster pump continues to operate, the pure water in the pure water return pipeline can flow back to the inlet of the booster pump.

8. The water purification system of claim 7, wherein, After the first pure water outlet stops drawing water, the booster pump continues to operate for 50 to 70 seconds.

9. The water purification system of claim 4, wherein, The water purification system includes a second wastewater pipeline, and the second reverse osmosis filter element also includes a second wastewater outlet; the second wastewater pipeline is connected to the second wastewater outlet, and a third drain valve is connected to the second wastewater pipeline. The outlet of the third drain valve is connected to the outside, and the third drain valve is configured to continue to discharge a preset amount of wastewater after the water purification system is shut down.

10. The water purification system of claim 9, wherein, The preset wastewater volume is 300-400ml.

11. The water purification system of claim 1, wherein, The water purification system also includes a housing, in which the pre-filter assembly and the second reverse osmosis filter element are both installed.

12. A water purifier characterized by comprising: The water purification system includes any one of claims 1 to 11.

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