Water purifier provided with multiple reverse osmosis units

Abstract

The utility model relates to the technical field of water purifiers, and provides a water purifier with a plurality of reverse osmosis units, which comprises a main water inlet valve, a booster pump, a water inlet valve, at least three reverse osmosis units and a water escape valve. Wherein the main water inlet valve is connected with raw water; the booster pump is communicated with the main water inlet valve; the water inlet valve is provided with a water inlet valve port, a first water drainage valve port and a second water drainage valve port, each reverse osmosis unit is provided with an input end, a pure water output end and a concentrated water output end, the reverse osmosis units are sequentially connected in series, and the water escape valve is provided with a first input port, a second input port and an output port. According to the water purifier provided by the utility model, the states of the water inlet valve and the water escape valve are controlled by arranging the water inlet valve and the water escape valve, so that the plurality of reverse osmosis units can be switched between forward water and reverse water, each reverse osmosis unit can be fully utilized, the service life is prolonged, the plurality of reverse osmosis units are arranged to filter and utilize concentrated water, and the water purification efficiency is improved. The content of impurities in the finally obtained concentrated water is more, and the waste of water resources is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of water purifiers, and particularly relates to a water purifier with multiple reverse osmosis units. Background Art

[0002] Reverse osmosis (abbreviated as RO in English, full name is Reverse Osmosis) refers to a membrane separation operation that uses a pressure difference as the driving force to separate the solvent from the solution. This membrane is a reverse osmosis membrane. Because it is in the opposite direction to natural osmosis, it is called reverse osmosis.

[0003] Apply pressure to the feed liquid on one side of the reverse osmosis membrane. When the pressure exceeds its osmotic pressure, the solvent will perform reverse osmosis against the direction of natural osmosis. Thus, the permeated solvent is obtained on the low-pressure side of the membrane, which is the permeate; and the concentrated solution is obtained on the high-pressure side, which is the concentrate. If seawater is treated by reverse osmosis, pure water is obtained on the low-pressure side of the membrane, and concentrated water is obtained on the high-pressure side.

[0004] Using this reverse osmosis principle, people have manufactured water purifiers. The water purifiers are provided with reverse osmosis membrane filters to perform reverse osmosis filtration on raw water to obtain pure water, and at the same time, concentrated water is also discharged.

[0005] However, in the related reverse osmosis water purifier technology, the utilization rate of the reverse osmosis membrane filter is low, the service life is short, and it needs to be replaced frequently. Moreover, the impurity content in the filtered concentrated water is low, resulting in a waste of water resources. Content of the Utility Model

[0006] In view of the above-mentioned defects of the prior art, the utility model provides a water purifier with multiple reverse osmosis units to solve at least one of the above-mentioned technical defects in the prior art, so that the utilization rate of the reverse osmosis membrane filter of the water purifier is higher, the service life is longer, it does not need to be replaced frequently, and the impurity content in the filtered concentrated water can be higher, thus saving water resources.

[0007] To achieve the purpose of the utility model, the utility model provides a water purifier with multiple reverse osmosis units, which includes:

[0008] A booster pump, having a pump inlet and a pump outlet, and the pump inlet is connected to raw water;

[0009] An inlet valve, having an inlet valve port, a first drain valve port and a second drain valve port, and the pump outlet is communicated with the inlet valve port;

[0010] At least three reverse osmosis units, each of the reverse osmosis units having an input end, a pure water output end and a concentrated water output end,

[0011] Each of the reverse osmosis units is connected in series in turn. The input end of the first reverse osmosis unit is communicated with the first drain valve port, the second drain valve port is communicated with the concentrated water output end of the last reverse osmosis unit, and the pure water output end of each reverse osmosis unit is connected to the pure water port of the water purifier;

[0012] A drain valve, having a first input port, a second input port and an output port,

[0013] The first input port is communicated with the concentrated water output end of the last reverse osmosis unit, the second drain valve port is communicated with the first input port, the second input port is communicated with the input end of the first reverse osmosis unit, and the output port is connected to the concentrated water port of the water purifier;

[0014] By controlling the states of the water inlet valve and the drain valve, the switching between the normal water flow and the reverse water flow of the reverse osmosis unit is realized.

[0015] In the first state, the raw water enters the serially connected reverse osmosis units from the input end of the first reverse osmosis unit. The pure water obtained after filtration all flows out from the pure water output end, and the concentrated water obtained flows out from the concentrated water output end of the last reverse osmosis unit, realizing normal water flow.

[0016] In the second state, the raw water enters the serially connected reverse osmosis units from the concentrated water output end of the last reverse osmosis unit. The pure water obtained after filtration all flows out from the pure water output end, and the concentrated water obtained flows out from the input end of the first reverse osmosis unit, realizing reverse water flow.

[0017] Preferably, the water inlet valve includes a first water inlet valve and a second water inlet valve.

[0018] The first water inlet valve has a first water inlet valve port and a first water outlet valve port, and the first water inlet valve port is communicated with the pump outlet.

[0019] The second water inlet valve has a second water inlet valve port and a second water outlet valve port, and the second water inlet valve port is communicated with the pump outlet;

[0020] The reverse osmosis unit includes a reverse osmosis unit A, a reverse osmosis unit B and a reverse osmosis unit C.

[0021] The reverse osmosis unit A includes an input end A, a pure water output end A and a concentrated water output end A.

[0022] The reverse osmosis unit B includes an input end B, a pure water output end B and a concentrated water output end B.

[0023] The reverse osmosis unit C includes an input end C, a pure water output end C and a concentrated water output end C.

[0024] The output end of the first concentrated water is communicated with the input end of the second, and the output end of the second concentrated water is communicated with the input end of the third;

[0025] The input end of the first is communicated with the first water outlet valve port, and the second water outlet valve port is communicated with the output end of the third concentrated water;

[0026] The drain valve includes a first drain valve and a second drain valve,

[0027] The first drain valve has a first inlet and a first outlet. The first inlet is communicated with the output end of the third concentrated water, and the second water outlet valve port is communicated with the first inlet;

[0028] The second drain valve has a second inlet and a second outlet. The second inlet is communicated with the input end of the first, and the second outlet is communicated with the first outlet. Both the second outlet and the first outlet are connected to the concentrated water port of the water purifier;

[0029] By controlling the opening or closing states of the first water inlet valve, the second water inlet valve, the first drain valve and the second drain valve, the switching between normal water flow and reverse water flow of each reverse osmosis unit is realized.

[0030] Preferably, in the first state, the total water inlet valve is opened, the booster pump is opened, the first water inlet valve is opened, the second water inlet valve is closed, the first drain valve is opened, the second drain valve is closed. The raw water enters the booster pump from the total water inlet valve, enters the reverse osmosis unit from the input end of the first through the first water inlet valve. The pure water obtained after filtration flows from the pure water output ends of the first, the second and the third to the pure water port of the water purifier, and the concentrated water obtained flows from the output end of the third concentrated water through the first drain valve to the concentrated water port of the water purifier;

[0031] In the second state, the total water inlet valve is opened, the booster pump is opened, the first water inlet valve is closed, the second water inlet valve is opened, the first drain valve is closed, the second drain valve is opened. The raw water enters the booster pump from the total water inlet valve, enters the reverse osmosis unit from the output end of the first concentrated water through the second water inlet valve. The pure water obtained after filtration flows from the pure water output ends of the first, the second and the third to the pure water port of the water purifier, and the concentrated water obtained flows from the input end of the first through the second drain valve to the concentrated water port of the water purifier.

[0032] Preferably, a waste water return valve is further included,

[0033] The waste water return valve has a return inlet and a return outlet,

[0034] The reflux inlet is communicated with the first row of outlets or the second row of outlets, and the reflux outlet is communicated with the pump inlet.

[0035] Preferably, a waste water valve is further included.

[0036] The waste water valve has a waste water inlet and a waste water outlet.

[0037] The waste water inlet is communicated with the reflux inlet, and the waste water outlet is connected to the concentrated water outlet of the water purifier.

[0038] Preferably, a TDS measuring device and a flow meter are further included and arranged in series.

[0039] The flow meter has a flow inlet and a flow outlet, the TDS measuring device has a measuring inlet and a measuring outlet, and the flow outlet is communicated with the measuring inlet.

[0040] The flow inlet is communicated with the output end of pure water of A, the output end of pure water of B, and the output end of pure water of C, and the measuring outlet is connected to the pure water outlet of the water purifier.

[0041] Preferably, a check valve and a purified water reflux valve are further included and arranged in series.

[0042] The check valve has a check valve inlet and a check valve outlet, the purified water reflux valve has a net flow inlet and a net flow outlet, and the net flow outlet is communicated with the check valve inlet.

[0043] The net flow inlet is communicated with the output end of pure water of A, the output end of pure water of B, and the output end of pure water of C, and the check valve outlet is communicated with the pump inlet.

[0044] Preferably, a pre-filter and a post-filter are further included.

[0045] The pre-filter is arranged at the front end of the total water inlet valve and is communicated with the water inlet.

[0046] The post-filter is arranged between the TDS measuring device and the pure water outlet of the water purifier and communicates the measuring outlet with the pure water outlet of the water purifier.

[0047] Preferably, a high-pressure switch and a check valve are further included.

[0048] The check valve has a check valve inlet and a check valve outlet, the check valve inlet is connected to the post-filter, and the check valve outlet is connected to the pure water outlet of the water purifier.

[0049] The high-pressure switch is arranged between the check valve and the pure water outlet of the water purifier.

[0050] Preferably, the water inlet valve is a three-way water inlet reversing valve, and the drain valve is a three-way drain reversing valve.

[0051] The beneficial effects of the present utility model are as follows: The water purifier with multiple reverse osmosis units provided by the present utility model controls the states of the inlet valve and the drain valve by setting an inlet valve having a water inlet port, a first drain port, and a second drain port, and a drain valve having a first input port, a second input port, and an output port, so that each reverse osmosis unit can be switched between normal water flow and reverse water flow, avoiding the phenomenon that each reverse osmosis unit can only have one-way normal water flow or reverse water flow, resulting in the inability to utilize some filtration positions of each reverse osmosis unit. Each reverse osmosis unit can be fully utilized, its utilization rate can be improved, its service life can be extended, and the replacement frequency of each reverse osmosis unit can also be reduced. By setting multiple reverse osmosis units connected in series in sequence, the concentrated water filtered by the first reverse osmosis unit can enter the adjacent second reverse osmosis unit, and the concentrated water can be filtered through multiple reverse osmosis units connected in series, so that the impurity content in the finally obtained concentrated water is more, and thus the concentrated water can be re-filtered and utilized, avoiding the waste of water resources. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] The above and other objects, features, and advantages of the present utility model will become more apparent from the preferred embodiments of the present utility model shown in the drawings. The same reference numerals in all the drawings indicate the same parts, and the drawings are not deliberately drawn to scale in actual size, with the emphasis on showing the gist of the present application.

[0053] Figure 1 It is a schematic diagram of the first inlet valve, the second inlet valve, the first drain valve, the second drain valve and other components of the water purifier with multiple reverse osmosis units provided by the embodiment of the present utility model in the first state;

[0054] Figure 2 It is a schematic diagram of the first inlet valve, the second inlet valve, the first drain valve, the second drain valve and other components of the water purifier with multiple reverse osmosis units provided by the embodiment of the present utility model in the second state;

[0055] Figure 3 It is a schematic diagram of the inlet valve and the drain valve of the water purifier with multiple reverse osmosis units provided by the embodiment of the present utility model in the first state;

[0056] Figure 4 It is a schematic diagram of the inlet valve and the drain valve of the water purifier with multiple reverse osmosis units provided by the embodiment of the present utility model in the second state.

[0057] In the figure:

[0058] 100, total inlet valve; 110, water inlet; 120, water outlet;

[0059] 200, booster pump; 210, pump inlet; 220, pump outlet;

[0060] 300, inlet valve; 310, water inlet port; 320, first drain port; 330, second drain port; 340, first inlet valve; 341, first inlet port; 342, first outlet port; 350, second inlet valve; 351, second inlet port; 352, second outlet port;

[0061] 400, reverse osmosis unit; 410, input end; 420, pure water output end; 430, concentrated water output end; 401, A reverse osmosis unit; 4011, A input end; 4012, A pure water output end; 4013, A concentrated water output end; 402, B reverse osmosis unit; 4021, B input end; 4022, B pure water output end; 4023, B concentrated water output end; 403, C reverse osmosis unit; 4031, C input end; 4032, C pure water output end; 4033, C concentrated water output end;

[0062] 500, drain valve; 510, first input port; 520, second input port; 530, output port; 540, first drain valve; 541, first inlet port; 542, first drain port; 550, second drain valve; 551, second inlet port; 552, second drain port;

[0063] 600, wastewater reflux valve; 610, reflux inlet; 620, reflux outlet;

[0064] 700, wastewater valve; 710, wastewater inlet; 720, wastewater outlet;

[0065] 800, TDS measuring device; 801, measuring inlet; 802, measuring outlet; 810, flow meter; 811, flow inlet; 812, flow outlet; 820, check valve; 821, check inlet; 822, check outlet; 830, purified water reflux valve; 831, purified water flow inlet; 832, purified water flow outlet; 840, high pressure switch; 841, check inlet; 842, check outlet; 850, check valve;

[0066] 900, pre-filter; 910, post-filter. Detailed implementation mode

[0067] For the convenience of understanding the present utility model, the present utility model will be described more comprehensively below with reference to the relevant attached drawings.

[0068] It should be noted that when an element is considered to be "connected" to another element, it can be directly connected to the other element and integrated with it, or there may be an intermediate element at the same time. The terms "installation", "one end", "the other end" and similar expressions used in this article are only for the purpose of illustration.

[0069] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this technology belongs. The terms used in the description of this specification are only for the purpose of describing specific embodiments and are not intended to limit the present utility model. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0070] The following will describe the embodiments of the present utility model in conjunction with Figures 1 to 4 , and it should be understood that the following description is only a schematic embodiment of the present utility model and does not constitute any limitation to the present utility model.

[0071] Referring to Figures 1 to 4 , an embodiment of the present utility model provides a water purifier with multiple reverse osmosis units, and the water purifier includes a booster pump 200, a water inlet valve 300, at least three reverse osmosis units 400, and a drain valve 500.

[0072] Among them, the booster pump 200 has a pump inlet 210 and a pump outlet 220, and the pump inlet 210 is connected to the raw water. Of course, a main water inlet valve 100 can also be provided. The main water inlet valve 100 has a water inlet 110 and a water outlet 120, and the water inlet 110 is connected to the raw water to input the raw water into the water purifier.

[0073] The water inlet valve 300 has a water inlet valve port 310, a first drain valve port 320, and a second drain valve port 330. The pump outlet 220 is communicated with the water inlet valve port 310, and the booster pump 200 supplies the pressurized raw water to the reverse osmosis unit 400 through the water inlet valve 300.

[0074] Each reverse osmosis unit 400 has an input end 410, a pure water output end 420, and a concentrated water output end 430; each reverse osmosis unit 400 is connected in series in sequence. The input end 410 of the first reverse osmosis unit 400 is communicated with the first drain valve port 320, and the second drain valve port 330 is communicated with the concentrated water output end 430 of the last reverse osmosis unit 400. The pure water output end 420 of each reverse osmosis unit 400 is connected to the pure water port of the water purifier. So that the raw water can enter each reverse osmosis unit 400 in sequence from the input end 410 of the first reverse osmosis unit 400, and the pure water obtained after filtration is output from the pure water output end 420 of each reverse osmosis unit 400, and the concentrated water obtained can be output from the concentrated water output end 430 of the last reverse osmosis unit 400; of course, the raw water can also enter each reverse osmosis unit 400 in sequence from the concentrated water output end 430 of the last reverse osmosis unit 400, and the pure water obtained after filtration is output from the pure water output end 420 of each reverse osmosis unit 400, and the concentrated water obtained can be output from the input end 410 of the first reverse osmosis unit 400.

[0075] The drain valve 500 has a first input port 510, a second input port 520, and an output port 530.

[0076] The first input port 510 communicates with the concentrated water output end 430 of the last reverse osmosis unit 400. The second drain valve port 330 communicates with the first input port 510. The second input port 520 communicates with the input end 410 of the first reverse osmosis unit 400. The output port 530 is connected to the concentrated water port of the water purifier, so that the concentrated water obtained after being filtered by each reverse osmosis unit 400 in sequence can be discharged from the output port 530 to the concentrated water port of the water purifier.

[0077] By controlling the states of the inlet valve 300 and the drain valve 500, it is possible to achieve the switching between normal water flow and reverse water flow of each reverse osmosis unit 400, so that each reverse osmosis unit 400 can filter raw water during both normal and reverse water flows, in order to make full use of each reverse osmosis unit 400.

[0078] In the first state, raw water enters each reverse osmosis unit 400 in sequence from the input end 410 of the first reverse osmosis unit 400. The pure water obtained after filtration all flows out from the pure water output end 420, and the concentrated water obtained flows out from the output end 430 of the last reverse osmosis unit 400, achieving normal water flow.

[0079] In the second state, raw water enters the reverse osmosis units 400 connected in series in sequence from the concentrated water output end 430 of the last reverse osmosis unit 400. The pure water obtained after filtration all flows out from the pure water output end 420 of each reverse osmosis unit 400, and the concentrated water obtained flows out from the input end 410 of the first reverse osmosis unit 400, achieving reverse water flow.

[0080] It can be understood that the water purifier with multiple reverse osmosis units provided by the embodiments of the present utility model controls the states of the inlet valve 300 and the drain valve 500 by providing an inlet valve 300 having an inlet valve port 310, a first drain valve port 320, and a second drain valve port 330, and a drain valve 500 having a first input port 510, a second input port 520, and an output port 530, so that each reverse osmosis unit 400 can switch between normal water flow and reverse water flow, avoiding the phenomenon that each reverse osmosis unit 400 can only conduct water in one direction (either normally or reversely), resulting in the inability to utilize some of the filtration positions of each reverse osmosis unit 400. Each reverse osmosis unit 400 can be fully utilized, its utilization rate can be improved, its lifespan can be extended, and the replacement frequency of each reverse osmosis unit 400 can also be reduced. By providing a plurality of reverse osmosis units 400 connected in series in sequence, the concentrated water filtered by the first reverse osmosis unit 400 can enter the adjacent second reverse osmosis unit 400, and this concentrated water can be filtered through a plurality of reverse osmosis units 400 connected in series, so that the impurity content in the finally obtained concentrated water is higher, and thus the concentrated water can be re-filtered and utilized, avoiding waste of water resources.

[0081] In the embodiments of the present utility model, each reverse osmosis unit 400 can be a reverse osmosis membrane filter element. When installed in this water purifier, the reverse osmosis membrane filter element has a higher utilization rate and a longer lifespan. Similarly, it is no longer necessary to frequently replace the reverse osmosis membrane filter element, thereby reducing the usage cost, and the concentrated water can also be re-filtered and utilized, avoiding waste of water resources.

[0082] Specifically, in some embodiments of the present utility model, the inlet valve 300 includes a first inlet valve 340 and a second inlet valve 350.

[0083] The first inlet valve 340 has a first inlet valve port 341 and a first outlet valve port 342, and the first inlet valve port 341 is communicated with the pump outlet 220.

[0084] The second inlet valve 350 has a second inlet valve port 351 and a second outlet valve port 352, and the second inlet valve port 351 is communicated with the pump outlet 220.

[0085] The reverse osmosis unit 400 includes a first reverse osmosis unit 401, a second reverse osmosis unit 402, and a third reverse osmosis unit 403.

[0086] The first reverse osmosis unit 401 includes a first input end 4011, a first pure water output end 4012, and a first concentrated water output end 4013.

[0087] The second reverse osmosis unit 402 includes a second input end 4021, a second pure water output end 4022, and a second concentrated water output end 4023.

[0088] The C reverse osmosis unit 403 includes a C input end 4031, a C pure water output end 4032, and a C concentrated water output end 4033.

[0089] The A concentrated water output end 4013 is connected to the B input end 4021, and the B concentrated water output end 4023 is connected to the C input end 4031.

[0090] The A input end 4011 is connected to the first water outlet valve port 342, and the second water outlet valve port 352 is connected to the C concentrated water output end 4033. When the first inlet valve 340 is opened and the second inlet valve 350 is closed, the raw water pressurized by the booster pump 200 can be output through the first water outlet valve port 342 and then flow into the A reverse osmosis unit 401 from the A input end 4011. The concentrated water obtained after filtration flows into the B reverse osmosis unit 402 and the C reverse osmosis unit 403 in sequence; when the second inlet valve 350 is opened and the first inlet valve 340 is closed, the raw water pressurized by the booster pump 200 can be output through the second water outlet valve port 352 and then flow into the C reverse osmosis unit 403 from the C concentrated water output end 4033. The concentrated water obtained after filtration flows into the B reverse osmosis unit 402 and the A reverse osmosis unit 401 in sequence. By controlling the opening or closing state of the first inlet valve 340 and the second inlet valve 350, it is possible to control the switching between the raw water flowing into each reverse osmosis unit 400 from the A input end 4011 or flowing into each reverse osmosis unit 400 from the C concentrated water output end 4033.

[0091] The drain valve 500 includes a first drain valve 540 and a second drain valve 550.

[0092] The first drain valve 540 has a first inlet 541 and a first outlet 542. The first inlet 541 is connected to the C concentrated water output end 4033, and the second water outlet valve port 352 is connected to the first inlet 541.

[0093] The second drain valve 550 has a second inlet 551 and a second outlet 552. The second inlet 551 is connected to the A input end 4011, the second outlet 552 is connected to the first outlet 542, and both the second outlet 552 and the first outlet 542 are connected to the concentrated water port of the water purifier. When the first drain valve 540 is opened and the second drain valve 550 is closed, the concentrated water obtained after filtration by each reverse osmosis unit 400 can flow out from the C concentrated water output end 4033 and then be discharged to the concentrated water port of the water purifier through the first outlet 542; when the second drain valve 550 is opened and the first drain valve 540 is closed, the concentrated water obtained after filtration by each reverse osmosis unit 400 can flow out from the A input end 4011 and then be discharged to the concentrated water port of the water purifier through the second outlet 552.

[0094] By controlling the opening or closing states of the first water inlet valve 340, the second water inlet valve 350, the first water discharge valve 540, and the second water discharge valve 550, the switching between normal water flow and reverse water flow of each reverse osmosis unit 400 is realized. While making full use of the reverse osmosis unit, improving its utilization rate, extending its service life, reducing the usage cost, and increasing the utilization rate of concentrated water to avoid waste of water resources, it can also simplify the structures of the water inlet valve 300 and the water discharge valve 500, thereby simplifying the structure of the water purifier and further reducing its manufacturing cost.

[0095] That is to say, in combination with Figure 1 , the dotted arrow indicates the direction of concentrated water. In the first state, the main water inlet valve 100 is open, the booster pump 200 is open, the first water inlet valve 340 is open, the second water inlet valve 350 is closed, the first water discharge valve 540 is open, and the second water discharge valve 550 is closed. Raw water enters the booster pump 200 from the main water inlet valve 100, and then enters each reverse osmosis unit 400 from the first water inlet valve 340 at the A input end 4011. The pure water obtained after filtration flows from the pure water output ends 420 of each reverse osmosis unit 400 (i.e., the A pure water output end 4012, the B pure water output end 4022, and the C pure water output end 4032) to the pure water outlet of the water purifier, and the concentrated water obtained flows from the C concentrated water output end 4033 through the first water discharge valve 540 to the concentrated water outlet of the water purifier.

[0096] In combination with Figure 2 , the dotted arrow indicates the direction of concentrated water. In the second state, the main water inlet valve 100 is open, the booster pump 200 is open, the first water inlet valve 340 is closed, the second water inlet valve 350 is open, the first water discharge valve 540 is closed, and the second water discharge valve 550 is open. Raw water enters the booster pump 200 from the main water inlet valve 100, and then enters each reverse osmosis unit 400 from the C concentrated water output end 4033 through the second water inlet valve 350. The pure water obtained after filtration flows from the pure water output ends 420 of each reverse osmosis unit 400 (i.e., the A pure water output end 4012, the B pure water output end 4022, and the C pure water output end 4032) to the pure water outlet of the water purifier, and the concentrated water obtained enters the A reverse osmosis unit 401, the B reverse osmosis unit 402, and the C reverse osmosis unit 403 in sequence from the A input end 4011 and then flows through the second water discharge valve 550 to the concentrated water outlet of the water purifier. In this way, by combining the opening or closing states of the first water inlet valve 340, the second water inlet valve 350, the first water discharge valve 540, and the second water discharge valve 550, the switching between the first state and the second state is realized. The structure is simpler, the state switching is more accurate, the switching accuracy between normal water flow and reverse water flow can be improved, ensuring that the reverse osmosis unit 400 can work properly under high utilization rate, and at the same time increasing the utilization rate of concentrated water, further avoiding waste of water resources.

[0097] Further, in order to filter the concentrated water filtered by each reverse osmosis unit 400 again and increase the pressure of the raw water to improve the filtration efficiency and the utilization rate of the concentrated water, in some embodiments of the present invention, the water purifier further includes a waste water reflux valve 600.

[0098] The waste water reflux valve 600 has a reflux inlet 610 and a reflux outlet 620.

[0099] The reflux inlet 610 is communicated with the first drain outlet 542 of the first drain valve 540 or the second drain outlet 552 of the second drain valve 550, and the reflux outlet 620 is communicated with the pump inlet 210.

[0100] When the waste water reflux valve 600 is opened, after being filtered by each reverse osmosis unit 400, a part of the concentrated water discharged from the first drain outlet 542 of the first drain valve 540 or the second drain outlet 552 of the second drain valve 550 can flow back into the booster pump 200 through the waste water reflux valve 600 from the reflux outlet 620.

[0101] Certainly, in some embodiments of the present invention, the water purifier further includes a waste water valve 700, and the waste water valve 700 has a waste water inlet 710 and a waste water outlet 720.

[0102] The waste water inlet 710 is communicated with the reflux inlet 610 of the waste water reflux valve 600, and the waste water outlet 720 is connected to the concentrated water outlet of the water purifier.

[0103] When the waste water valve 700 is opened, after being filtered by each reverse osmosis unit 400, the concentrated water discharged from the first drain outlet 542 of the first drain valve 540 or the second drain outlet 552 of the second drain valve 550 can flow into the concentrated water outlet of the water purifier through the waste water valve 700 from the waste water inlet 710.

[0104] When the waste water valve 700 is closed, after being filtered by each reverse osmosis unit 400, the concentrated water discharged from the first drain outlet 542 of the first drain valve 540 or the second drain outlet 552 of the second drain valve 550 can only flow back into the booster pump 200 through the waste water reflux valve 600 from the reflux outlet 620. In this way, all the concentrated water obtained after being filtered by each reverse osmosis unit 400 can flow back into the booster pump 200, further increasing the pressure of the raw water, and further improving the filtration efficiency and the utilization rate of the concentrated water.

[0105] Certainly, both the first drain valve 540 and the second drain valve 550 can be normally closed valves.

[0106] In some embodiments of the present invention, the water purifier further includes a TDS measuring device 800 and a flow meter 810 arranged in series.

[0107] The flowmeter 810 has a flow inlet 811 and a flow outlet 812, the TDS measuring device 800 has a measurement inlet 801 and a measurement outlet 802, and the flow outlet 812 communicates with the measurement inlet 801.

[0108] The flow inlet 811 communicates with the pure water output ends 420 of each reverse osmosis unit 400, that is, the flow inlet 811 communicates with the pure water output end 4012 of A, the pure water output end 4022 of B, and the pure water output end 4032 of C, and the measurement outlet 802 is connected to the pure water port of the water purifier.

[0109] The TDS measuring device 800 is a Total Dissolved Solids, that is, a "total dissolved solids" measuring device, which can measure the total dissolved solids in the pure water obtained after being filtered by each reverse osmosis unit 400, so that users can judge the quality of the pure water and improve the intelligence level of the water purifier. The flowmeter 810 can measure the output flow of the pure water. Users can accurately set the amount of purified water required each time, prevent the amount of purified water from being too much or too little, meet the needs of users, and can also prevent each reverse osmosis unit 400 from overworking, thereby further prolonging the life of each reverse osmosis unit 400.

[0110] In some embodiments of the present invention, the water purifier further includes a one-way valve 820 and a purified water return valve 830 arranged in series.

[0111] The one-way valve 820 has a one-way inlet 821 and a one-way outlet 822, the purified water return valve 830 has a net flow inlet 831 and a net flow outlet 832, and the net flow outlet 832 communicates with the one-way inlet 821.

[0112] The net flow inlet 831 communicates with each pure water output end 420 (that is, the pure water output end 4012 of A, the pure water output end 4022 of B, and the pure water output end 4032 of C), and the one-way outlet 822 communicates with the pump inlet 210.

[0113] When the pure water pressure at each pure water output end 420 is too high, the purified water return valve 830 opens, and the pure water can flow into the booster pump 200 through the purified water return valve 830 and the one-way valve 820, which can further pressurize the raw water and at the same time reduce the pressure of the pure water output from the pure water port of the water purifier.

[0114] In some embodiments of the present invention, the water purifier further includes a pre-filter 900 and a post-filter 910.

[0115] The pre-filter 900 is arranged at the front end of the main inlet valve 100 and communicates with the water inlet 110.

[0116] The post-filter 910 is arranged between the TDS measuring device 800 and the pure water port of the water purifier, and communicates the measurement outlet 802 with the pure water port of the water purifier.

[0117] After the raw water flows into the pre-filter 900, the pre-filter 900 can filter impurities such as sediment in the raw water and then input it to the main inlet valve 100 to protect the safety of each component of the water purifier.

[0118] After the pure water is output from each pure water output end 420 of each reverse osmosis unit 400, the post-filter 910 can adjust the taste of the pure water.

[0119] The pre-filter 900 and the post-filter 910 can be two independent filters. They can also be integrated into a composite filter. Of course, only one of the pre-filter 900 and the post-filter 910 can be set to save manufacturing costs.

[0120] In some embodiments of the present utility model, a high-pressure switch 840 and a check valve 850 are further included.

[0121] The check valve 850 has a check inlet 841 and a check outlet 842. The check inlet 841 is connected to the post-filter 910, and the check outlet 842 is connected to the pure water outlet of the water purifier.

[0122] The high-pressure switch 840 is arranged between the check valve 850 and the pure water outlet of the water purifier.

[0123] When the pressure of the pure water output from each reverse osmosis unit 400 is too high, its pressure can be controlled by the high-pressure switch 840. The high-pressure switch 840 can also monitor the pressure of the output pure water so as to timely control the opening or closing of the pure water return valve 830, enabling the pure water to return to the booster pump 200 to reduce the pressure.

[0124] Combined Figure 3 and Figure 4 , in some embodiments of the present utility model, the inlet valve 300 can be a three-way inlet reversing valve, and the drain valve 500 is a three-way drain reversing valve.

[0125] Combined Figure 3, the dotted arrow indicates the flow direction of the concentrated water. In the first state, the main inlet valve 100 is opened, the booster pump 200 is opened, the water inlet valve port 310 of the three-way inlet reversing valve is connected to the first drain valve port 320, the water inlet valve port 310 of the three-way inlet reversing valve is disconnected from the second drain valve port 330, the first input port 510 of the three-way drain reversing valve is connected to the output port 530, and the second input port 520 of the three-way drain reversing valve is disconnected from the output port 530. Raw water enters the booster pump 200 from the main inlet valve 100. After being reversed by the three-way inlet reversing valve, it enters the A reverse osmosis unit 401, B reverse osmosis unit 402, and C reverse osmosis unit 403 in sequence from the A input end 4011. The pure water obtained after filtration all flows from each pure water output end 420 to the pure water outlet of the water purifier. The concentrated water obtained flows to the concentrated water outlet of the water purifier after being reversed by the three-way drain reversing valve from the C concentrated water output end 4033.

[0126] Combined with Figure 4 , the dotted arrow indicates the flow direction of the concentrated water. In the second state, the main inlet valve 100 is opened, the booster pump 200 is opened, the water inlet valve port 310 of the three-way inlet reversing valve is connected to the second drain valve port 330, the water inlet valve port 310 of the three-way inlet reversing valve is disconnected from the first drain valve port 320, the first input port 510 of the three-way drain reversing valve is disconnected from the output port 530, and the second input port 520 of the three-way drain reversing valve is connected to the output port 530. Raw water enters the booster pump 200 from the main inlet valve 100. After being reversed by the three-way inlet reversing valve, it enters the C reverse osmosis unit 403, B reverse osmosis unit 402, and A reverse osmosis unit 401 in sequence from the C concentrated water output end 4033. The pure water obtained after filtration all flows from each pure water output end 420 to the pure water outlet of the water purifier. The concentrated water obtained flows to the concentrated water outlet of the water purifier after being reversed by the three-way drain reversing valve from the A input end 4011.

[0127] The inlet valve 300 or the drain valve 500 can alternately open and close the two flow channels as needed to achieve the switching function of the fluid. The stroke is short, the opening and closing are rapid, ensuring the switching efficiency between the forward water flow and the reverse water flow of each reverse osmosis unit 400.

[0128] In this specification, unless otherwise clearly specified and limited, the first feature being "on" or "under" the second feature can be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature can be that the first feature is directly above or obliquely above the second feature, or simply indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "below" and "beneath" the second feature can be that the first feature is directly below or obliquely below the second feature, or simply indicates that the first feature has a lower horizontal height than the second feature.

[0129] In the description of this specification, the descriptions referring to terms such as "preferred embodiment", "another embodiment", "some embodiments", "other embodiments" or "specific examples" etc. mean that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0130] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present application. Those of ordinary skill in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present application.

Claims

1. A water purifier having a plurality of reverse osmosis units, characterized in that: include: A booster pump having a pump inlet and a pump outlet, wherein the pump inlet is connected to the raw water; A water inlet valve, comprising a water inlet valve port, a first drain valve port and a second drain valve port, wherein the pump outlet is connected to the water inlet valve port; at least three reverse osmosis units, each of which has an input end, a pure water output end and a concentrated water output end, Each of the reverse osmosis units is connected in series in sequence, the input end of the first reverse osmosis unit is connected to the first drainage valve port, the second drainage valve port is connected to the concentrated water output end of the last reverse osmosis unit, and the pure water output end of each reverse osmosis unit is connected to the pure water port of the water purifier; The drain valve has a first input port, a second input port and an output port, The first input port is connected to the concentrated water output end of the last reverse osmosis unit, the second drain valve port is connected to the first input port, the second input port is connected to the input end of the first reverse osmosis unit, and the output port is connected to the concentrated water port of the water purifier; By controlling the states of the water inlet valve and the water drain valve, the reverse osmosis unit can be switched between forward water flow and reverse water flow. In the first state, the raw water enters the reverse osmosis units connected in series from the input end of the first reverse osmosis unit, the pure water obtained after filtration flows out from the pure water output end, and the concentrated water obtained flows out from the concentrated water output end of the last reverse osmosis unit, realizing positive water flow. In the second state, the raw water enters the reverse osmosis units connected in series from the concentrated water output end of the last reverse osmosis unit, the pure water obtained after filtration flows out from the pure water output end, and the concentrated water flows out from the input end of the first reverse osmosis unit, realizing reverse water flow.

2. The water purifier having a plurality of reverse osmosis units according to claim 1, wherein: include: The water inlet valve comprises a first water inlet valve and a second water inlet valve, The first water inlet valve has a first water inlet valve port and a first water outlet valve port, and the first water inlet valve port is connected to the pump outlet. The second water inlet valve has a second water inlet valve port and a second water outlet valve port, and the second water inlet valve port is connected to the pump outlet; The reverse osmosis unit comprises reverse osmosis unit A, reverse osmosis unit B and reverse osmosis unit C. The A reverse osmosis unit comprises an A input end, an A pure water output end and an A concentrated water output end. The B reverse osmosis unit comprises a B input end, a B pure water output end and a B concentrated water output end. The propylene reverse osmosis unit includes a propylene input end, a propylene pure water output end and a propylene concentrated water output end. The A concentrated water output end is connected to the B input end, and the B concentrated water output end is connected to the C input end; The A input end is connected to the first water outlet valve port, and the second water outlet valve port is connected to the C concentrated water output end; The drain valve comprises a first drain valve and a second drain valve. The first drain valve has a first inlet and a first outlet, the first inlet is connected to the propylene concentrated water output end, and the second outlet is connected to the first inlet; The second drain valve has a second inlet and a second outlet, the second inlet is connected to the first input end, the second outlet is connected to the first outlet, and the second outlet and the first outlet are both connected to the concentrated water outlet of the water purifier; By controlling the opening or closing state of the first water inlet valve, the second water inlet valve, the first water drain valve and the second water drain valve, the switching between the forward water flow and the reverse water flow of each reverse osmosis unit is achieved.

3. The water purifier having a plurality of reverse osmosis units according to claim 2, wherein: It also includes a main water inlet valve, the main water inlet valve has a water inlet and a water outlet, and the water inlet is connected to the raw water; In the first state, the main water inlet valve is opened, the booster pump is opened, the first water inlet valve is opened, the second water inlet valve is closed, the first drain valve is opened, and the second drain valve is closed. The raw water enters the booster pump from the main water inlet valve, and enters the reverse osmosis unit from the input end A through the first water inlet valve. The pure water obtained after filtration flows from the pure water output end A, the pure water output end B and the pure water output end C to the pure water outlet of the water purifier, and the concentrated water obtained flows from the concentrated water output end C to the concentrated water outlet of the water purifier after passing through the first drain valve. In the second state, the main water inlet valve is opened, the booster pump is turned on, the first water inlet valve is closed, the second water inlet valve is opened, the first drain valve is closed, and the second drain valve is opened. The raw water enters the booster pump from the main water inlet valve and enters the reverse osmosis unit from the A concentrated water output end through the second water inlet valve. The pure water obtained after filtration flows from the A pure water output end, the B pure water output end and the C pure water output end to the pure water inlet of the water purifier, and the concentrated water obtained flows from the A input end through the second drain valve to the concentrated water inlet of the water purifier.

4. The water purifier having a plurality of reverse osmosis units according to claim 3, wherein: Also includes wastewater return valve, The wastewater reflux valve has a reflux inlet and a reflux outlet. The reflux inlet is communicated with the first discharge port or the second discharge port, and the reflux outlet is communicated with the pump inlet.

5. The water purifier having a plurality of reverse osmosis units according to claim 4, wherein: Also includes waste water valve, The wastewater valve has a wastewater inlet and a wastewater outlet. The wastewater inlet is communicated with the reflux inlet, and the wastewater outlet is connected to the concentrated water outlet of the water purifier.

6. The water purifier having a plurality of reverse osmosis units according to claim 5, wherein: It also includes a TDS measuring device and a flow meter arranged in series. The flow meter has a flow inlet and a flow outlet, the TDS measuring device has a measurement inlet and a measurement outlet, the flow outlet is connected to the measurement inlet, The flow inlet is connected to the pure water output end A, the pure water output end B and the pure water output end C, and the measurement outlet is connected to the pure water inlet of the water purifier.

7. The water purifier having a plurality of reverse osmosis units according to claim 6, wherein: It also includes a one-way valve and a clean water return valve arranged in series. The one-way valve has a one-way inlet and a one-way outlet, and the clean water return valve has a net flow inlet and a net flow outlet, and the net flow outlet is connected to the one-way inlet. The net flow inlet is connected to the pure water output end A, the pure water output end B and the pure water output end C, and the one-way outlet is connected to the pump inlet.

8. The water purifier having a plurality of reverse osmosis units according to claim 7, wherein: It also includes pre-filter and post-filter. The pre-filter is arranged at the front end of the main water inlet valve and is connected to the water inlet. The post-filter element is arranged between the TDS measuring device and the pure water inlet of the water purifier, and connects the measuring outlet with the pure water inlet of the water purifier.

9. The water purifier having a plurality of reverse osmosis units according to claim 8, wherein: It also includes high pressure switch and check valve, The check valve has a check inlet and a check outlet, wherein the check inlet is connected to the post-filter element, and the check outlet is connected to the pure water outlet of the water purifier. The high-pressure switch is arranged between the check valve and the pure water outlet of the water purifier.

10. The water purifier having a plurality of reverse osmosis units according to claim 1, wherein: The water inlet valve is a three-way water inlet reversing valve, and the water drain valve is a three-way water drain reversing valve.

Images