Water purification system

Abstract

The water purification system of the present application comprises two or more RO membrane filters, a water inlet pipeline connected to a water source at one end and to the water inlets of the RO membrane filters at the other end, a purified water pipeline connected to the purified water outlets of the RO membrane filters at one end and to a purified water supply port at the other end, and a mixed water pipeline connected to the mixed water outlets of the RO membrane filters at one end and to a waste water outlet at the other end. A first bypass pipeline is arranged between the purified water pipeline of each RO membrane filter and the water inlet pipeline of another RO membrane filter, and a second bypass pipeline is arranged between the purified water pipeline of each RO membrane filter and the mixed water pipeline of itself or another RO membrane filter. During a first specified period, the purified water filtered through at least one RO membrane filter is introduced into the water inlet pipeline of another RO membrane filter through the first bypass pipeline to perform water replacement flushing on the other RO membrane filter, and at the same time, the purified water in the purified water pipeline of the RO membrane filter being water replacement flushed is discharged from the mixed water pipeline of itself or another RO membrane filter through the second bypass pipeline. The present application improves the purified water quality of the water purification system, prolongs the service life of the RO membrane filter, and improves the reliability of the system.

Description

TECHNICAL FIELD

[0001] The present application relates to a water purification system, in particular to a water purification system using an RO membrane filter. BACKGROUND

[0002] The water purification system using an RO membrane filter has been very common in the existing water purification system. However, the RO membrane filter used in the traditional water purification system is soaked in concentrated water (or mixed water) when not in use. The minerals in the high-concentration mixed water are easy to precipitate and scale on the surface of the precise RO membrane and in the flow channel, causing the RO membrane to be blocked and damaged, reducing the service life of the RO membrane. At the same time, the TDS value of the mixed water becomes very high. In addition, the applicant found through testing that the mixed water in the RO membrane filter after being used for one day and left overnight will slowly penetrate to the side of the purified water, causing the TDS value of the side of the purified water in the RO membrane filter (i.e. the side of the RO membrane filter purified water outlet) to also become high or even exceed the standard. Therefore, when the user uses the purified water in the morning and turns on the water supply of the water purification system, the user needs to let the water purification system run for a while (sometimes for several minutes), i.e. let the new purified water discharge or dilute the purified water with a high TDS value before using the purified water that meets the water quality requirements. This not only causes water waste but also makes the user wait. Therefore, the existing technology has appeared various technical solutions containing RO membrane filter cleaning as disclosed in patent document CN203360148U. The technical solution adopts a pressure tank and various solenoid valves, which has the problems of complex flushing unit structure and the system and flushing unit cannot work when power is off (power failure), etc. At the same time, the flushing process is the same as the process of purifying water through the RO membrane filter, and the concentrated water (i.e. mixed water) discharged from the RO membrane filter needs to pass through the waste water ratio (i.e. flow limiting valve or throttling valve) before being discharged, so that the flushing cannot be thoroughly performed, i.e. the concentrated water (i.e. mixed water) will still remain in the RO membrane filter at a certain proportion, and after being left overnight, the mixed water with a higher TDS value will still penetrate to the side of the purified water, causing the problem that the water quality cannot meet the standard or the user needs to wait after the RO membrane filter is restarted.

[0003] In addition, the existing water purification systems including patent document CN203360148U basically do not have a water inlet valve specially arranged on the side of the water supply source, causing the pipelines and element devices in the system to be always under the pressure from the water supply source during the non-working period. As time goes by, the system often leaks, affecting the reliability and service life of the system.

[0004] In view of the above problems, the applicant proposes a water purification system that can improve the quality of purified water, prolong the service life of the RO membrane filter, and improve the reliability as a solution, and has submitted a patent application (see ZL202210266980.4 and ZL202220588591.9).

[0005] But in the above-mentioned solutions, some solutions need to set a clean water storage tank as a clean water source for flushing the RO membrane filter, and the clean water storage tank has a risk of breeding bacteria slowly during long-term use, therefore, the market urgently needs a clean water system which can improve the quality of clean water, prolong the service life of the RO membrane filter, improve the reliability, and eliminate the risk of breeding bacteria. SUMMARY

[0006] The first clean water system provided by the present application comprises two or more RO membrane filters, a water inlet pipeline connected at one end to a water supply source and at the other end to the water inlets of the RO membrane filters, a clean water pipeline connected at one end to the clean water outlets of the RO membrane filters and at the other end to a clean water supply port, and a mixed water pipeline connected at one end to the mixed water outlets of the RO membrane filters and at the other end to a waste water outlet, wherein a first bypass pipeline is arranged between the clean water pipeline of each RO membrane filter and the water inlet pipeline of another RO membrane filter, and a second bypass pipeline is arranged between the clean water pipeline of each RO membrane filter and the mixed water pipeline of itself or another RO membrane filter. During a first specified period, the clean water filtered by at least one RO membrane filter is introduced into the water inlet pipeline of another RO membrane filter through the first bypass pipeline to perform water replacement flushing on the other RO membrane filter, and at the same time, the clean water in the clean water pipeline of the RO membrane filter being water replacement flushed is discharged from the mixed water pipeline of itself or another RO membrane filter through the second bypass pipeline.

[0007] The second clean water system provided by the present application is based on the first clean water system, and a first water inlet control valve is arranged on the water inlet pipeline of at least one RO membrane filter, a second water inlet control valve is arranged on the water inlet pipeline of another RO membrane filter, a first clean water control valve is arranged on the clean water pipeline of at least one RO membrane filter, a second clean water control valve is arranged on the first bypass pipeline, and a third clean water control valve is arranged on the second bypass pipeline. Through the linkage of the first water inlet control valve, the second water inlet control valve, the first clean water control valve, the second clean water control valve, the third clean water control valve, and a clean water outlet control valve arranged at the clean water supply port, the clean water filtered by at least one RO membrane filter is introduced into the water inlet pipeline of another RO membrane filter through the first bypass pipeline to perform water replacement flushing on the other RO membrane filter during a first specified period, and at the same time, the clean water discharged from the clean water pipeline of the RO membrane filter being water replacement flushed is discharged through the second bypass pipeline and the mixed water pipeline.

[0008] The third water purification system according to the present application is based on the second water purification system, and only when the water purification outlet control valve is closed and a second predetermined time has passed, water filtered by at least one RO membrane filter is introduced into the water inlet line of the other RO membrane filter through the first bypass line.

[0009] The fourth water purification system according to the present application is based on the second or third water purification system, and a fourth water purification control valve is further provided in the water purification line of each RO membrane filter, and the water purification line of each RO membrane filter is controlled to be simultaneously or alternately communicated with the water purification supply port through the fourth water purification control valve.

[0010] The fifth water purification system according to the present application is based on the fourth water purification system, and only when the RO membrane filter that needs to be water-replacement flushed has continuously worked for a third predetermined time, the water purification line of each RO membrane filter is controlled to be simultaneously communicated with the water purification supply port by opening all the fourth water purification control valves.

[0011] The sixth water purification system according to the present application is based on any one of the first to fifth water purification systems, and a water supply control valve is provided in the water inlet line on the water supply source side.

[0012] The seventh water purification system according to the present application is based on any one of the first to fourth water purification systems, and further comprises a mixed water drainage line having one end communicated with the mixed water discharge port of each RO membrane filter and the other end communicated with the waste water discharge port of each RO membrane filter, and a mixed water control valve is further provided in the mixed water drainage line.

[0013] According to the water purification system of the present application, the quality of purified water and the reliability of the system can be improved, and the service life of the RO membrane filter can be prolonged. In addition, the risk of slow bacterial growth in the water storage tank during long-term use can be prevented, BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 FIG. 1 is a schematic view showing the configuration and operation of a water purification system according to a first embodiment of the present application.

[0015] Figure 2 FIG. 2 is a schematic view showing the configuration and operation of a water purification system according to a second embodiment of the present application.

[0016] Figure 3 FIG. 3 is a schematic view showing the configuration and operation of a water purification system according to a third embodiment of the present application.

[0017] Figure 4Fig. 1 is a schematic diagram showing the configuration and operation of a water purification system according to a first embodiment of the present application.

[0018] Figure 5 Fig. 1 is a schematic diagram showing the configuration and operation of a water purification system according to a first embodiment of the present application.

[0019] Figure 6 Fig. 1 is a schematic diagram showing the configuration and operation of a water purification system according to a first embodiment of the present application.

[0020] Figure 7 Fig. 1 is a schematic diagram showing the configuration and operation of a water purification system according to a first embodiment of the present application.

[0021] Figure 8 Fig. 1 is a schematic diagram showing the configuration and operation of a water purification system according to a first embodiment of the present application.

[0022] Figure 9 Fig. 1 is a schematic diagram showing the configuration and operation of a water purification system according to a first embodiment of the present application.

[0023] Figure 10 Fig. 1 is a schematic diagram showing the configuration and operation of a water purification system according to a first embodiment of the present application.

[0024] Figure 11 Fig. 1 is a schematic diagram showing the configuration and operation of a water purification system according to a first embodiment of the present application.

[0025] Figure 12 Fig. 1 is a schematic diagram showing the configuration and operation of a water purification system according to a first embodiment of the present application.

[0026] Figure 13 Fig. 1 is a schematic diagram showing the configuration and operation of a water purification system according to a first embodiment of the present application.

[0027] Figure 14 Fig. 1 is a schematic diagram showing the configuration and operation of a water purification system according to a first embodiment of the present application.

[0028] Figure 15 Fig. 1 is a schematic diagram showing the configuration and operation of a water purification system according to a first embodiment of the present application.

[0029] Figure 16 Fig. 1 is a schematic diagram showing the configuration and operation of a water purification system according to a first embodiment of the present application. DETAILED DESCRIPTION

[0030] The configuration of the water purification system according to the present application will be described below with reference to the drawings.

[0031] (First Embodiment)

[0032] Figures 1 to 10 Fig. 1 is a schematic diagram showing the configuration and operation of a water purification system according to a first embodiment of the present application. Figures 1 to 10As shown, the water purification system 10 of the present embodiment is a water purification system comprising two RO membrane filters 11, 12, wherein first and second water inlet control valves 16, 17 are respectively connected to water inlet lines 14, 15 which are connected at one end to a tap water pipe 13 as a water supply and at the other end to RO membrane filter water inlets 11a, 12a, and a pretreatment filter 18 and a water supply control valve 19 are provided between the first and second water inlet control valves 16, 17 and the water supply.

[0033] In addition, first water purification control valves 23, 24 are respectively connected to water purification lines 21, 22 which are connected at one end to water purification outlets 11b, 12b of the RO membrane filters 11, 12 and at the other end to a water purification supply port 20, a post-filter 26 is connected to a water purification line 25 between the first water purification control valves 23, 24 and the water purification supply port 20, and a water purification outlet control valve 27 is further provided to the water purification line 25 between the post-filter 26 and the water purification supply port 20.

[0034] In addition, flow control valves 32, 33 are respectively connected to water mixing lines 30, 31 which are connected at one end to water mixing outlets 11c, 12c of the RO membrane filters 11, 12 and at the other end to waste water outlets 28, 29.

[0035] The water purification system 10 further comprises first bypass lines 34, 35, wherein the first bypass line 34 is used to connect (or conduct, the same below) the water purification line 21 between the water purification outlet 11b of the RO membrane filter 11 and the first water purification control valve 23 to the water inlet line 15 between the RO membrane filter water inlet 12a of the RO membrane filter 12 and the second water inlet control valve 17, and the first bypass line 35 is used to connect the water purification line 22 between the water purification outlet 12b of the RO membrane filter 12 and the first water purification control valve 24 to the water inlet line 14 between the RO membrane filter water inlet 11a of the RO membrane filter 11 and the first water inlet control valve 16. In addition, check valves 36, 37 and first water purification control valves 38, 39 are respectively provided to the first bypass lines 34, 35, wherein the check valve 36 is arranged to only allow water purification flowing through the first bypass line 34 to flow to the water inlet line 15 and prevent water flowing through the water inlet line 15 from flowing to the first bypass line 34, and the check valve 37 is arranged to only allow water purification flowing through the first bypass line 35 to flow to the water inlet line 14 and prevent water flowing through the water inlet line 14 from flowing to the first bypass line 35.

[0036] The water purification system 10 is also provided with second bypass pipelines 40, 41, wherein the second bypass pipeline 40 is used to connect the mixed water pipeline 30 between the first purified water control valve 23 of the RO membrane filter 11 and the purified water outlet control valve 27 (specifically, the first purified water control valve 23 and the post-filter 26) with the wastewater discharge outlet 28 of the RO membrane filter 11, and the second bypass pipeline 41 is used to connect the mixed water pipeline 31 between the first purified water control valve 24 of the RO membrane filter 12 and the purified water outlet control valve 27 (specifically, the first purified water control valve 24 and the post-filter 26) with the wastewater discharge outlet 29 of the RO membrane filter 12. In addition, the third purified water control valves 42, 43 are respectively arranged on the second bypass pipelines 40, 41.

[0037] The water purification system 10 is also provided with mixed water drain pipelines 44, 45. One end of the mixed water drain pipeline 44 is connected to the mixed water pipeline 30 connected to the mixed water discharge outlet 11c of the RO membrane filter 11 to realize communication with the mixed water discharge outlet 11c of the RO membrane filter 11, and the other end is connected to the mixed water pipeline 30 connected to the wastewater discharge outlet 28 to realize communication with the wastewater discharge outlet 28. One end of the mixed water drain pipeline 45 is connected to the mixed water pipeline 31 connected to the mixed water discharge outlet 12c of the RO membrane filter 12 to realize communication with the mixed water discharge outlet 12c of the RO membrane filter 12, and the other end is connected to the mixed water pipeline 31 connected to the wastewater discharge outlet 29 to realize communication with the wastewater discharge outlet 29. In addition, the mixed water drain control valves 46, 47 are respectively arranged on the mixed water drain pipelines 44, 45.

[0038] In addition, the water purification system 10 also includes booster pumps 48, 49 arranged on the water inlet pipelines 14, 15 between the RO membrane filter water inlets 11a, 12a of the RO membrane filters 11, 12 and the connection points of the first bypass pipelines 34, 35.

[0039] In addition, the present water purifying system 10 includes a control system (not shown) and all of the control valves except for the purified water outlet control valve are electromagnetic valves, and the control system includes a timer (not shown). The present water purifying system 10 controls all of the control valves through the control system, and specifically, controls the first water inlet control valve 16, the second water inlet control valve 17, the first purified water control valve 23, the second purified water control valve 24, and the third purified water control valve 25 to be linked to the purified water outlet control valve 27 provided at the purified water supply port 20, so that the purified water filtered through one of the RO membrane filters 11 or 12 is introduced into the water inlet line 14 or 15 of the other RO membrane filter 12 or 11 through the first bypass line 34 or 35 for water replacement flushing of the other RO membrane filter 12 or 11, and at the same time, the purified water from the purified water line 22 or 21 of the RO membrane filter 12 or 11 subjected to the water replacement flushing is discharged through the second bypass line 41 or 40 and the mixed water line 31 or 30 for a predetermined period of time. The predetermined period of time is pre-set in the control system, and is, for example, 3 minutes, 5 minutes, 8 minutes, or more than 10 minutes.

[0040] Hereinafter, the control of the present water purifying system 10 by the control system and the effects of water production and flushing will be described with reference to the drawings. Figures 1 to 10

[0041] Figure 1 The first use of the present water purifying system 10 is shown in the drawing, in which the water is purified through the RO membrane filter 11. That is, when the user opens the purified water outlet control valve 27, the control system receives a control signal from the purified water outlet control valve 27, and controls the water supply control valve 19, the first water inlet control valve 16, and the first purified water control valve 23 to be open while the other control valves are closed. Thus, the tap water from the tap water line 13 is introduced into the RO membrane filter 11 through the water supply control valve 19, the pre-treatment filter 18, the first water inlet control valve 16, the water inlet line 14, and the RO membrane filter inlet 11a, and the purified water is discharged to the purified water supply port 20 through the purified water outlet 11b, the first purified water control valve 23, the purified water line 21, the post-treatment filter 26, the purified water line 25, and the purified water outlet control valve 27 for the user to drink.

[0042] As Figure 2 ​As shown, when the user closes the purified water outlet control valve 27, the control system receives a control signal from the purified water outlet control valve 27, controlling the water supply control valve 19, the first inlet control valve 16, and the first purified water control valve 38 to be in the open state, and controlling other control valves to be in the closed state. Thus, tap water from the tap water pipe 13 enters the RO membrane filter 11 through the water supply control valve 19, the pretreatment filter 18, the first inlet control valve 16, the inlet pipe 14, and the RO membrane filter inlet 11a. The purified water is then sent to the RO membrane filter 12 through the purified water outlet 11b, the first purified water control valve 38, the first bypass pipe 34, the check valve 36, the inlet pipe 15, and the RO membrane filter inlet 12a for flushing the RO membrane filter 12. This means that the purified water produced by the RO membrane filter 11 replaces the tap water in flushing the RO membrane filter 12. At this time, the flushing of the inlet side of the RO membrane filter 12 can be as follows: Figure 2 As shown, the rinsed water is discharged to the wastewater outlet 29 through the mixing outlet 12c, the flow restrictor valve 33, and the mixing pipe 31. Alternatively, it can be as follows: Figure 3 As shown, the control system receives a control signal from the purified water outlet control valve 27, and simultaneously opens the water supply control valve 19, the first inlet control valve 16, and the first purified water control valve 38, while also opening the mixing water drain control valve 47. The flushed water then flows through the mixing water outlet 12c, the mixing water drain control valve 47, the mixing water drain pipe 45, and the mixing water pipe 31 to the wastewater outlet 29. On the other hand, the flushing of the purified water side of the RO membrane filter 12 can be performed as follows: Figure 4 As shown, the control system receives a control signal from the purified water outlet control valve 27, and simultaneously opens the water supply control valve 19, the first inlet control valve 16, and the first purified water control valve 38, while also opening the first purified water control valve 24 and the third purified water control valve 43. The flushed water then flows through the purified water outlet 12b, the first purified water control valve 24, the purified water pipeline 22, the third purified water control valve 43, the second bypass pipeline 41, and the mixing pipeline 31 to the wastewater outlet 29. Of course, flushing of the purified water side of the RO membrane filter 12 can also be performed in the same manner. Figure 5 As shown, the flushing is performed synchronously or alternately with the flushing on the inlet side.

[0043] like Figure 6 As shown, after the first specified flushing time (e.g., 5 minutes), the control system controls all control valves to be closed. That is, after the RO membrane filter 12 is filled with purified water on both the inlet and purified water sides, the control system controls all control valves to be closed.

[0044] like Figure 7As shown in Fig. 6, when the user twists the clean water outlet control valve 27 to take water, the control system obtains the control signal from the clean water outlet control valve 27, controls the feed water control valve 19, the second feed water control valve 17, the first clean water control valve 24 to be open, and maintains the other control valves to be closed. Thus, the tap water from the tap water pipe 13 passes through the feed water control valve 19, the pretreatment filter 18, the second feed water control valve 17, the feed water pipe 15, the RO membrane filter water inlet 12a of the RO membrane filter 12, and the purified clean water passes through the clean water outlet 12b, the first clean water control valve 24, the clean water pipe 22, the post filter 26, the clean water pipe 25, the clean water outlet control valve 27 to be supplied to the clean water supply port 20 for the user to drink.

[0045] As shown in Fig. 5, when the user twists the clean water outlet control valve 27 to take water, the control system obtains the control signal from the clean water outlet control valve 27, controls the feed water control valve 19, the second feed water control valve 17, the first clean water control valve 24 to be open, and maintains the other control valves to be closed. Thus, the tap water from the tap water pipe 13 passes through the feed water control valve 19, the pretreatment filter 18, the second feed water control valve 17, the feed water pipe 15, the RO membrane filter water inlet 12a of the RO membrane filter 12, and the purified clean water passes through the clean water outlet 12b, the first clean water control valve 24, the clean water pipe 22, the post filter 26, the clean water pipe 25, the clean water outlet control valve 27 to be supplied to the clean water supply port 20 for the user to drink. Figure 8 As shown in Fig. 4, when a certain time elapses after the user takes water, the clean water in the water inlet side of the RO membrane filter 12 is gradually replaced by the tap water.

[0046] As shown in Fig. 5, when the user twists the clean water outlet control valve 27 to take water, the control system obtains the control signal from the clean water outlet control valve 27, controls the feed water control valve 19, the second feed water control valve 17, the first clean water control valve 24 to be open, and maintains the other control valves to be closed. Thus, the tap water from the tap water pipe 13 passes through the feed water control valve 19, the pretreatment filter 18, the second feed water control valve 17, the feed water pipe 15, the RO membrane filter water inlet 12a of the RO membrane filter 12, and the purified clean water passes through the clean water outlet 12b, the first clean water control valve 24, the clean water pipe 22, the post filter 26, the clean water pipe 25, the clean water outlet control valve 27 to be supplied to the clean water supply port 20 for the user to drink. Figure 9 As shown in Fig. 5, when the user twists the clean water outlet control valve 27 to take water, the control system obtains the control signal from the clean water outlet control valve 27, controls the feed water control valve 19, the second feed water control valve 17, the first clean water control valve 24 to be open, and maintains the other control valves to be closed. Thus, the tap water from the tap water pipe 13 passes through the feed water control valve 19, the pretreatment filter 18, the second feed water control valve 17, the feed water pipe 15, the RO membrane filter water inlet 12a of the RO membrane filter 12, and the purified clean water passes through the clean water outlet 12b, the first clean water control valve 24, the clean water pipe 22, the post filter 26, the clean water pipe 25, the clean water outlet control valve 27 to be supplied to the clean water supply port 20 for the user to drink. Figure 9 As shown in Fig. 6, when the user twists the clean water outlet control valve 27 to take water, the control system obtains the control signal from the clean water outlet control valve 27, controls the feed water control valve 19, the second feed water control valve 17, the first clean water control valve 24 to be open, and maintains the other control valves to be closed. Thus, the tap water from the tap water pipe 13 passes through the feed water control valve 19, the pretreatment filter 18, the second feed water control valve 17, the feed water pipe 15, the RO membrane filter water inlet 12a of the RO membrane filter 12, and the purified clean water passes through the clean water outlet 12b, the first clean water control valve 24, the clean water pipe 22, the post filter 26, the clean water pipe 25, the clean water outlet control valve 27 to be supplied to the clean water supply port 20 for the user to drink. Figures 3 to 5 As shown in Fig. 6, when the user twists the clean water outlet control valve 27 to take water, the control system obtains the control signal from the clean water outlet control valve 27, controls the feed water control valve 19, the second feed water control valve 17, the first clean water control valve 24 to be open, and maintains the other control valves to be closed. Thus, the tap water from the tap water pipe 13 passes through the feed water control valve 19, the pretreatment filter 18, the second feed water control valve 17, the feed water pipe 15, the RO membrane filter water inlet 12a of the RO membrane filter 12, and the purified clean water passes through the clean water outlet 12b, the first clean water control valve 24, the clean water pipe 22, the post filter 26, the clean water pipe 25, the clean water outlet control valve 27 to be supplied to the clean water supply port 20 for the user to drink.

[0047] As shown in Fig. 6, when the user twists the clean water outlet control valve 27 to take water, the control system obtains the control signal from the clean water outlet control valve 27, controls the feed water control valve 19, the second feed water control valve 17, the first clean water control valve 24 to be open, and maintains the other control valves to be closed. Thus, the tap water from the tap water pipe 13 passes through the feed water control valve 19, the pretreatment filter 18, the second feed water control valve 17, the feed water pipe 15, the RO membrane filter water inlet 12a of the RO membrane filter 12, and the purified clean water passes through the clean water outlet 12b, the first clean water control valve 24, the clean water pipe 22, the post filter 26, the clean water pipe 25, the clean water outlet control valve 27 to be supplied to the clean water supply port 20 for the user to drink. Figure 10 As shown in Fig. 6, when the user twists the clean water outlet control valve 27 to take water, the control system obtains the control signal from the clean water outlet control valve 27, controls the feed water control valve 19, the second feed water control valve 17, the first clean water control valve 24 to be open, and maintains the other control valves to be closed. Thus, the tap water from the tap water pipe 13 passes through the feed water control valve 19, the pretreatment filter 18, the second feed water control valve 17, the feed water pipe 15, the RO membrane filter water inlet 12a of the RO membrane filter 12, and the purified clean water passes through the clean water outlet 12b, the first clean water control valve 24, the clean water pipe 22, the post filter 26, the clean water pipe 25, the clean water outlet control valve 27 to be supplied to the clean water supply port 20 for the user to drink.

[0048] When the user twists the clean water outlet control valve 27 again to take water, the present clean water system 10 supplies water through the RO membrane filter 11, so that the RO membrane filter 11 and the RO membrane filter 12 supply water alternately, and when the clean water outlet control valve 27 is closed, the RO membrane filter 11 or the RO membrane filter 12 on the side of the next water supply is subjected to the water replacement flushing within the first specified time after the closing, that is, the present clean water system 10 normally purifies the water supply through the RO membrane filter 11 or the RO membrane filter 12 alternately, and simultaneously subjects the other side to the water replacement flushing alternately, so that the clean water can be supplied in time every time the user twists the clean water outlet control valve 27 to take water, and there is no problem of zero standing water.

[0049] On the other hand, the present clean water system 10 can also control the water replacement flushing in the following manner. That is, when the user closes the clean water outlet control valve 27, the other RO membrane filter is not subjected to the water replacement flushing immediately, but the control system starts the water replacement flushing of the other RO membrane filter when the clean water outlet control valve 27 has not been twisted for the second specified time. The second specified time can be set to 30 minutes, 1 hour, 1 hour and 30 minutes, or 2 hours or more. In addition, the control system can be set to suspend the water replacement flushing of the other RO membrane filter and restart the RO membrane filter which is currently supplying the clean water when the user twists the clean water outlet control valve 27 during the water replacement flushing. For example, when the clean water outlet control valve 27 has not been twisted for 30 minutes after the RO membrane filter 11 starts to supply the clean water, the control system starts the water replacement flushing of the RO membrane filter 12 in the manner shown in Fig. 6. If the user twists the clean water outlet control valve 27 to take water during the water replacement flushing (i.e., before the second specified time has elapsed), the control system suspends or stops the water replacement flushing of the RO membrane filter 12 and instructs the RO membrane filter 11 to restart the clean water supply in the manner shown in Fig. 7. In this way, unnecessary frequent water replacement flushing can be prevented, and the reliability and life of the system can be greatly improved. Figures 2 to 5 Figure 1 In this way, the unnecessary frequent water replacement flushing can be prevented, and the reliability and life of the system can be greatly improved.

[0050] With the present clean water system, it can be ensured that there is no mixed water accumulation in the RO membrane filter 11 or the RO membrane filter 12 until the next day when the clean water is used, and problems such as the TDS value of the clean water used at the beginning of the next day exceeding the standard or the clean water with a TDS value not exceeding the standard having to be waited for a long time can be prevented.

[0051] (Second Embodiment)

[0052] Figures 11 to 16 ​Fig. 2 is a schematic diagram showing the configuration of a water purifying system according to a second embodiment of the present application. As shown in Fig. 2, the water purifying system 50 according to the second embodiment of the present application is similar to the water purifying system 10 according to the first embodiment of the present application, except that a fourth water purifying control valve 51 is additionally provided on the water purifying pipeline 21 between the first water purifying control valve 23 and the water purifying outlet control valve 27, and a fourth water purifying control valve 52 is additionally provided on the water purifying pipeline 22 between the second water purifying control valve 24 and the water purifying outlet control valve 27. The other configuration is the same as that of the first embodiment of the present application. The same components are assigned the same reference numerals, and the detailed description thereof is omitted. Figures 11 to 16

[0053] The following description will be given with reference to Figures 11 to 16 The manner in which the water purifying system 50 according to the second embodiment of the present application is controlled by the control system and the effects of water production and flushing obtained thereby will be described.

[0054] Figure 11 Fig. 2 shows a schematic diagram in which water is purified by both the RO membrane filter 11 and the RO membrane filter 12 when the water purifying system 50 is used for the first time. That is, when the water purifying outlet control valve 27 is turned on by a user, the control system receives a control signal from the water purifying outlet control valve 27, controls the water supply control valve 19, the first water inlet control valve 16, the first water purifying control valve 23, the fourth water purifying control valve 51, the second water inlet control valve 17, the second water purifying control valve 24, and the fourth water purifying control valve 52 to be open while maintaining the other control valves to be closed, so that the tap water from the tap water pipeline 13 passes through the water supply control valve 19, the pretreatment filter 18, the first water inlet control valve 16, the water inlet pipeline 14, the RO membrane filter water inlet 11a of the RO membrane filter 11, and the RO membrane filter water inlet 12a of the RO membrane filter 12, and the purified water passes through the water purifying outlet 11b, the first water purifying control valve 23, the water purifying pipeline 21, the fourth water purifying control valve 51, the post-filter 26, the water purifying pipeline 25, and the water purifying outlet control valve 27 to be supplied to the water purifying outlet 20 for the user to drink, and the purified water also passes through the water purifying outlet 12b, the second water purifying control valve 24, the water purifying pipeline 22, the fourth water purifying control valve 52, the post-filter 26, the water purifying pipeline 25, and the water purifying outlet control valve 27 to be supplied to the water purifying outlet 20 for the user to drink. That is, the water purifying system 50 according to the second embodiment of the present application supplies water to the user who has turned on the water purifying outlet control valve 27 by both the RO membrane filter 11 and the RO membrane filter 12.

[0055] As shown in Fig. 3, the water purifying system 50 according to the second embodiment of the present application is similar to the water purifying system 10 according to the first embodiment of the present application, except that the fourth water purifying control valve 51 is additionally provided on the water purifying pipeline 21 between the first water purifying control valve 23 and the water purifying outlet control valve 27. The other configuration is the same as that of the first embodiment of the present application. The same components are assigned the same reference numerals, and the detailed description thereof is omitted. Figure 12 ​As shown, when the user closes the purified water outlet control valve 27, the control system receives a control signal from the purified water outlet control valve 27, controlling the water supply control valve 19, the first inlet control valve 16, and the first purified water control valve 38 to be in the open state, and controlling other control valves to be in the closed state. Thus, tap water from the tap water pipe 13 enters the RO membrane filter 11 through the water supply control valve 19, the pretreatment filter 18, the first inlet control valve 16, the inlet pipe 14, and the RO membrane filter inlet 11a. The purified water is then sent to the RO membrane filter 12 through the purified water outlet 11b, the first purified water control valve 38, the first bypass pipe 34, the check valve 36, the inlet pipe 15, and the RO membrane filter inlet 12a for flushing the RO membrane filter 12. This means that the purified water produced by the RO membrane filter 11 replaces the tap water in flushing the RO membrane filter 12. At this time, the flushing of the inlet side of the RO membrane filter 12 can be as follows: Figure 12 As shown, the rinsed water is discharged to the wastewater outlet 29 through the mixing outlet 12c, the flow restrictor valve 33, and the mixing pipe 31. It can also be connected to... Figures 3 to 5 The RO membrane filter 12 is cleaned on both the inlet and purified water sides in the manner shown.

[0056] like Figure 13 As shown, after the first specified flushing time (e.g., 5 minutes), the control system controls all control valves to be closed. That is, after the RO membrane filter 12 is filled with purified water on both the inlet and purified water sides, the control system controls all control valves to be closed.

[0057] like Figure 14When the user twists the water outlet control valve 27 to take water, the control system obtains the control signal from the water outlet control valve 27, controls the water supply control valve 19, the first water inlet control valve 16, the second water inlet control valve 17, the first purified water control valve 23, the second purified water control valve 24, the third purified water control valve 42, the fourth purified water control valve 52 to open and maintains other control valves in the closed state, thus, the tap water from the tap water pipe 13 enters the RO membrane filter 12 through the water supply control valve 19, the pretreatment filter 18, the second water inlet control valve 17, the water inlet pipe 15, the RO membrane filter water inlet 12a, the purified water passes through the purified water outlet 12b, the first purified water control valve 24, the purified water pipe 22, the fourth purified water control valve 52, the post-filter 26, the purified water pipe 25, the water outlet control valve 27 to the purified water supply port 20 for the user to drink, at the same time, the tap water from the tap water pipe 13 enters the RO membrane filter 11 through the water supply control valve 19, the pretreatment filter 18, the first water inlet control valve 16, the water inlet pipe 14, the RO membrane filter water inlet 11a, the purified water passes through the purified water outlet 11b, the first purified water control valve 23, the purified water pipe 21, the third purified water control valve 42, the second bypass pipe 40, the mixed water pipe 30 to be discharged.

[0058] In addition, as Figure 15As shown, after the third predetermined time has elapsed, the control system issues a command to open the water supply control valve 19, the first inlet water control valve 16, the first purified water control valve 23, the fourth purified water control valve 51, the second inlet water control valve 17, the first purified water control valve 24, and the fourth purified water control valve 52, while keeping the other control valves closed. Thus, tap water from the water supply pipe 13 enters the RO membrane filter 11 through the water supply control valve 19, the pretreatment filter 18, the first inlet water control valve 16, the inlet pipe 14, and the RO membrane filter inlet 11a. The tap water from the water supply pipe 13 also passes through the water supply control valve 19 and the pretreatment filter 18... The second inlet control valve 17, inlet pipe 15, and RO membrane filter inlet 12a enter the RO membrane filter 12. The purified water is then delivered to the purified water supply port 20 for drinking through the purified water outlet 11b, first purified water control valve 23, purified water pipe 21, fourth purified water control valve 51, post-filter 26, purified water pipe 25, and purified water outlet control valve 27. Simultaneously, the purified water is also delivered to the purified water supply port 20 for drinking through the purified water outlet 12b, first purified water control valve 24, purified water pipe 22, fourth purified water control valve 52, post-filter 26, purified water pipe 25, and purified water outlet control valve 27. In other words, this water purification system 50 simultaneously supplies water to the user who has opened the purified water outlet control valve 27 via both the RO membrane filters 11 and 12. The third specified time is set according to the time required for the TDS value of the purified water by the RO membrane filter 11 to reach the specified drinking standard, for example, it can be set to 5 minutes, 7 minutes or more than 10 minutes.

[0059] like Figure 16 As shown, when the user closes the purified water outlet control valve 27, the control system receives a control signal from the purified water outlet control valve 27, controlling the water supply control valve 19, the second inlet control valve 17, and the first purified water control valve 39 to be in the open state, and controlling other control valves to be in the closed state. Thus, tap water from the tap water pipe 13 enters the RO membrane filter 12 through the water supply control valve 19, the pretreatment filter 18, the second inlet control valve 17, the inlet pipe 15, and the RO membrane filter inlet 12a. The purified water is then sent to the RO membrane filter 11 through the purified water outlet 12b, the first purified water control valve 39, the first bypass pipe 35, the check valve 37, the inlet pipe 14, and the RO membrane filter inlet 11a for flushing the RO membrane filter 11. This means that the purified water produced by the RO membrane filter 12 replaces the tap water in flushing the RO membrane filter 11. At this time, the flushing of the inlet side of the RO membrane filter 11 can be as follows: Figure 16 As shown, the rinsed water is discharged to the wastewater outlet 28 through the mixing outlet 11c, the flow restrictor valve 32, and the mixing pipe 30. It can also be connected to... Figures 3 to 5The water inlet side and the purified water side of the RO membrane filter 11 are cleaned in the manner corresponding to the illustrated manner.

[0060] After the first predetermined time (for example, 5 minutes) elapses, the control system controls all the control valves to be closed, that is, when the water inlet side and the purified water side of the RO membrane filter 11 are replaced with purified water, the control system controls all the control valves to be closed.

[0061] When the user again twists the purified water outlet control valve 27 to take water, the purified water system 50 supplies water through the RO membrane filter 11, so that the purified water system 50 can supply purified water through the RO membrane filter 11 or the RO membrane filter 12 alternately or simultaneously, and replace and clean the other one alternately or clean itself, so that purified water can be supplied in time when the user twists the purified water outlet control valve 27 to take water each time, and there is no problem of zero standing water. In addition, since the multiple (two in the embodiment) RO membrane filters can supply water simultaneously after the third predetermined time elapses, compared with the first embodiment, for example, a system that needs to supply 600 gallons of purified water does not need to use two RO membrane filters that can purify 600 gallons of water, but only needs to use two RO membrane filters that can purify 300 gallons of water, so that the cost and size of the purified water system can be reduced.

[0062] In addition, the above embodiments are described by using two RO membrane filters, but the purified water system of the present application can use multiple (for example, three, four or more than five) RO membrane filters, and the combination and the replacement and cleaning manner can be changed at will.

[0063] In addition, the first predetermined time can be 3 minutes, 6 minutes or more than 7 minutes in addition to 5 minutes.

[0064] In addition, the second bypass pipeline of the RO membrane filter in the above embodiments is arranged between the purified water pipeline and the mixed water pipeline of the RO membrane filter, but is not limited to this, and the second bypass pipeline of the first RO membrane filter can be arranged between the purified water pipeline of the first RO membrane filter and the mixed water pipeline of the second RO membrane filter.

[0065] The booster pump of the above embodiment, in addition to providing the purified water used to flush the RO membrane filter with higher pressure, can also be used to increase the water pressure in the water inlet pipeline when the water pressure in the water inlet pipeline is low. The booster pump can also be controlled by a control system according to the detection results of a water pressure sensor or the like.

[0066] The water purification system 10, 50 of the present application can overcome the problems in the prior art with simple structure and manner, not only ensuring and improving the quality of purified water, but also prolonging the service life of the RO membrane filter. In addition, since the purified water storage tank is not used as a source of purified water for flushing the RO membrane filter, the risk of slow bacterial growth that occurs during long-term use of the purified water storage tank can be prevented. Furthermore, since the water supply control valve is provided and closed when the purified water is not in use, the pipelines and component devices in the system are not always under pressure from the water source during non-working periods, thereby preventing the problem of easy leakage in the system of the prior art and improving the reliability and service life of the system.

Claims

1. A water purification system comprising two or more RO membrane filters, a water inlet line having one end connected to a water supply source and the other end connected to a water inlet of each RO membrane filter, a purified water line having one end connected to a purified water outlet of each RO membrane filter and the other end connected to a purified water supply port, and a mixed water line having one end connected to a mixed water discharge port of each RO membrane filter and the other end connected to a waste water discharge port, wherein a first bypass line is provided between the purified water line of each RO membrane filter and the water inlet line of the other RO membrane filters, the first bypass line being configured to allow the purified water line of any one RO membrane filter to communicate with the water inlet line of all the other RO membrane filters, so that any one RO membrane filter can be used as a flushing source to perform water replacement flushing on all the other RO membrane filters, a second bypass line is provided between the purified water line of each RO membrane filter and the mixed water line of itself or the other RO membrane filter, the second bypass line being configured to completely guide the purified water in the purified water line of the RO membrane filter being water replacement flushed to the mixed water line for discharge, so as to avoid the purified water remaining in the purified water line, and during a first specified period, the purified water filtered by at least one RO membrane filter is introduced into the water inlet line of the other RO membrane filters through the first bypass line to perform water replacement flushing on the other RO membrane filters, while the purified water in the purified water line of the RO membrane filter being water replacement flushed is discharged from the mixed water line of itself or the other RO membrane filter through the second bypass line.

2. The water purification system according to claim 1, wherein a first water inlet control valve is provided on the water inlet line of at least one RO membrane filter, a second water inlet control valve is provided on the water inlet line of the other RO membrane filters, a first purified water control valve is provided on the purified water line of at least one RO membrane filter, a second purified water control valve is provided on the first bypass line, a third purified water control valve is provided on the second bypass line, and the first water inlet control valve, the second water inlet control valve, the first purified water control valve, the second purified water control valve, the third purified water control valve and a purified water outlet control valve provided on the purified water supply port are linked to each other, so as to introduce the purified water filtered by at least one RO membrane filter into the water inlet line of the other RO membrane filters through the first bypass line to perform water replacement flushing on the other RO membrane filters during the first specified period, while the purified water from the purified water line of the RO membrane filter being water replacement flushed is discharged through the second bypass line and the mixed water line.

3. The water purification system according to claim 2, wherein ​ ​ ​ ​ The water replacement backwash of the other RO membrane filter is performed by introducing the purified water filtered through the at least one RO membrane filter into the water inlet line of the other RO membrane filter through the first bypass line only when the purified water outlet control valve is closed and a second prescribed time elapses.

4. The purified water system according to claim 2 or 3, wherein A fourth purified water control valve is further provided on the purified water line of each RO membrane filter, and the purified water line of each RO membrane filter is controlled to be simultaneously or alternately communicated with the purified water supply port through the fourth purified water control valve.

5. The purified water system according to claim 4, wherein The purified water line of each RO membrane filter is controlled to be simultaneously communicated with the purified water supply port by opening all the fourth purified water control valves only when the RO membrane filter to be water replacement backwashed continuously performs the purified water operation for a third prescribed time.

6. The purified water system according to any one of claims 1 to 3, wherein A feed water control valve is provided on the water inlet line on the feed water source side.

7. The purified water system according to claim 4, wherein A feed water control valve is provided on the water inlet line on the feed water source side.

8. The purified water system according to claim 5, wherein A feed water control valve is provided on the water inlet line on the feed water source side.

9. The purified water system according to any one of claims 1 to 3, wherein A mixed water drain line is further provided, one end of which is communicated with the mixed water discharge port of each RO membrane filter and the other end of which is communicated with the waste water discharge port of each RO membrane filter, and a mixed water control valve is further provided on the mixed water drain line.

10. The purified water system according to claim 4, wherein A mixed water drain line is further provided, one end of which is communicated with the mixed water discharge port of each RO membrane filter and the other end of which is communicated with the waste water discharge port of each RO membrane filter, and a mixed water control valve is further provided on the mixed water drain line.

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