Water purifier with single reverse osmosis unit

Abstract

The utility model relates to the technical field of water purifiers, and provides a water purifier with a single reverse osmosis unit, which comprises a main water inlet valve, a booster pump, a water inlet valve, a reverse osmosis unit 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 drain valve port and a second drain valve port, the reverse osmosis unit is provided with an input end, a pure water output end and a concentrated water output end, 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 water inlet valve and the water escape valve are arranged, and the states of the water inlet valve and the water escape valve are controlled, so that the reverse osmosis unit can be switched between forward water flow and reverse water flow, and the phenomenon that part of filtering positions of the reverse osmosis unit cannot be utilized because the reverse osmosis unit can only realize one-way forward water flow or reverse water flow is avoided; the reverse osmosis unit can be fully utilized, the utilization rate is improved, the service life is prolonged, the replacement frequency of the reverse osmosis unit can be reduced, and the use cost of the water purifier is reduced.

Description

Technical Field

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

[0002] Reverse Osmosis (abbreviated as RO, English name: 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 opposite to the direction of 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 and the service life is short, resulting in the need to frequently replace the reverse osmosis membrane filter of the water purifier, and the use cost is high. Summary of the Utility Model

[0006] In view of the above-mentioned defects of the prior art, the utility model provides a water purifier with a single reverse osmosis unit 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, the frequency of replacing the reverse osmosis membrane filter of the water purifier is reduced, and thus the use cost is reduced.

[0007] In order to achieve the purpose of the utility model, the utility model provides a water purifier with a single reverse osmosis unit, 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] A reverse osmosis unit, having an input end, a pure water output end and a concentrated water output end, the input end is communicated with the first drain valve port, the second drain valve port is communicated with the concentrated water output end, and the pure water output end is connected to the pure water port of the water purifier;

[0011] A drain valve, having a first input port, a second input port and an output port,

[0012] The first input port is communicated with the concentrated water output end, the second drain valve port is communicated with the first input port, the second input port is communicated with the input end, and the output port is connected to the concentrated water port of the water purifier;

[0013] By controlling the states of the water inlet valve and the drain valve, the switching between normal water flow and reverse water flow of the reverse osmosis unit is realized.

[0014] In the first state, the raw water enters the reverse osmosis unit from the input end, 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, realizing normal water flow.

[0015] In the second state, the raw water enters the reverse osmosis unit from the concentrated water output end, the pure water obtained after filtration flows out from the pure water output end, and the concentrated water obtained flows out from the input end, realizing reverse water flow.

[0016] Preferably, the water inlet valve includes a first water inlet valve and a second water inlet valve.

[0017] 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.

[0018] 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;

[0019] The input end is communicated with the first water outlet valve port, and the second water outlet valve port is communicated with the concentrated water output end;

[0020] The drain valve includes a first drain valve and a second drain valve.

[0021] The first drain valve has a first inlet and a first outlet, the first inlet is communicated with the concentrated water output end, and the second water outlet valve port is communicated with the first inlet;

[0022] The second drain valve has a second inlet and a second outlet, the second inlet is communicated with the input end, the second outlet is communicated with the first outlet, and both the second outlet and the first outlet are connected to the concentrated water port of the water purifier;

[0023] 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 the reverse osmosis unit is realized.

[0024] Preferably, a total water inlet valve is further included, and the total water inlet valve has a water inlet and a water outlet, and the water inlet is connected to the raw water;

[0025] In the first state, the main inlet valve is open, the booster pump is open, the first inlet valve is open, the second inlet valve is closed, the first drain valve is open, the second drain valve is closed, the raw water enters the booster pump from the main inlet valve, enters the reverse osmosis unit from the input end through the first inlet valve, the purified water obtained after filtration flows from the purified water output end to the purified water outlet of the water purifier, and the concentrated water obtained flows from the concentrated water output end through the first drain valve to the concentrated water outlet of the water purifier;

[0026] In the second state, the main inlet valve is open, the booster pump is open, the first inlet valve is closed, the second inlet valve is open, the first drain valve is closed, the second drain valve is open, the raw water enters the booster pump from the main inlet valve, enters the reverse osmosis unit from the concentrated water output end through the second inlet valve, the purified water obtained after filtration flows from the purified water output end to the purified water outlet of the water purifier, and the concentrated water obtained flows from the input end through the second drain valve to the concentrated water outlet of the water purifier.

[0027] Preferably, a waste water return valve is further included,

[0028] The waste water return valve has a return inlet and a return outlet,

[0029] The return inlet is communicated with the first discharge outlet or the second discharge outlet, and the return outlet is communicated with the pump inlet.

[0030] Preferably, a waste water valve is further included,

[0031] The waste water valve has a waste water inlet and a waste water outlet,

[0032] The waste water inlet is communicated with the return inlet, and the waste water outlet is connected to the concentrated water outlet of the water purifier.

[0033] Preferably, a TDS measuring device and a flow meter are further included and arranged in series,

[0034] The flow meter has a flow inlet and a flow outlet, the TDS measuring device has a measuring inlet and a measuring outlet, the flow outlet is communicated with the measuring inlet,

[0035] The flow inlet is communicated with the purified water output end, and the measuring outlet is connected to the purified water outlet of the water purifier.

[0036] Preferably, a check valve and a purified water return valve are further included and arranged in series,

[0037] The check valve has a check inlet and a check outlet, the purified water return valve has a net flow inlet and a net flow outlet, the net flow outlet is communicated with the check inlet,

[0038] The net water inlet is communicated with the pure water output end, and the one-way outlet is communicated with the pump inlet.

[0039] Preferably, a pre-filter and a post-filter are further included.

[0040] The pre-filter is arranged at the front end of the total water inlet valve and is communicated with the water inlet.

[0041] 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.

[0042] Preferably, a high-pressure switch and a check valve are further included.

[0043] 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.

[0044] The high-pressure switch is arranged between the check valve and the pure water outlet of the water purifier.

[0045] Preferably, the water inlet valve is a three-way water inlet reversing valve, and the drain valve is a three-way drain reversing valve.

[0046] The beneficial effects of the present utility model are as follows: The water purifier with a single reverse osmosis unit provided by the present utility model controls the states of the water inlet valve and the drain valve by arranging a water 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 the reverse osmosis unit can be switched between normal water flow and reverse water flow, avoiding the phenomenon that the reverse osmosis unit can only conduct water in one direction (either normally or reversely), resulting in some filtering positions of the reverse osmosis unit being unavailable. The reverse osmosis unit can be fully utilized, its utilization rate can be improved, its service life can be extended, and the replacement frequency of the reverse osmosis unit can be reduced, thereby reducing the use cost of the water purifier. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] The above and other objects, features and advantages of the present utility model will become more clear through 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 focus on showing the gist of the present application.

[0048] Figure 1 It is a schematic diagram of the first water inlet valve, the second water inlet valve, the first drain valve and the second drain valve and other components of the water purifier with a single reverse osmosis unit provided by the embodiment of the present utility model in the first state;

[0049] Figure 2Schematic diagram of components such as the first inlet valve, second inlet valve, first drain valve, and second drain valve of a water purifier with a single reverse osmosis unit in the second state provided by an embodiment of the present utility model;

[0050] Figure 3 Schematic diagram of the inlet valve and drain valve of a water purifier with a single reverse osmosis unit in the first state provided by an embodiment of the present utility model;

[0051] Figure 4 Schematic diagram of the inlet valve and drain valve of a water purifier with a single reverse osmosis unit in the second state provided by an embodiment of the present utility model.

[0052] In the figure:

[0053] 100, main inlet valve; 110, inlet; 120, outlet;

[0054] 200, booster pump; 210, pump inlet; 220, pump outlet;

[0055] 300, inlet valve; 310, water inlet valve port; 320, first drain valve port; 330, second drain valve port; 340, first inlet valve; 341, first inlet valve port; 342, first outlet valve port; 350, second inlet valve; 351, second inlet valve port; 352, second outlet valve port;

[0056] 400, reverse osmosis unit; 410, input end; 420, pure water output end; 430, concentrated water output end;

[0057] 500, drain valve; 510, first input port; 520, second input port; 530, output port; 540, first drain valve; 541, first inlet; 542, first drain port; 550, second drain valve; 551, second inlet; 552, second drain port;

[0058] 600, wastewater return valve; 610, return inlet; 620, return outlet;

[0059] 700, wastewater valve; 710, wastewater inlet; 720, wastewater outlet;

[0060] 800, TDS measuring device; 801, measuring inlet; 802, measuring outlet; 810, flowmeter; 811, flow inlet; 812, flow outlet; 820, check valve; 821, check inlet; 822, check outlet; 830, purified water return valve; 831, purified water return inlet; 832, purified water return outlet; 840, high-pressure switch; 841, check inlet; 842, check outlet; 850, check valve;

[0061] 900, pre-filter; 910, post-filter. Detailed implementation mode

[0062] For the convenience of understanding the present utility model, the present utility model will be described more comprehensively below with reference to the relevant drawings.

[0063] 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 herein are only for the purpose of illustration.

[0064] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which this application belongs. The terms used in the specification herein 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.

[0065] The following combines Figures 1 to 4 , and describes the embodiments of the present utility model. It should be understood that the following description is only a schematic implementation mode of the present utility model, and does not constitute any limitation to the present utility model.

[0066] Refer to Figures 1 to 4 , the embodiment of the present utility model provides a water purifier with a single reverse osmosis unit. The water purifier includes a booster pump 200, a water inlet valve 300, a reverse osmosis unit 400 and a drain valve 500.

[0067] 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 total water inlet valve 100 can also be provided. The total 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 for this water purifier.

[0068] 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.

[0069] The reverse osmosis unit 400 has an input end 410, a pure water output end 420, and a concentrated water output end 430; the input end 410 is communicated with the first drain valve port 320, the second drain valve port 330 is communicated with the concentrated water output end 430, and the pure water output end 420 is connected to the pure water port of the water purifier. The raw water can enter the reverse osmosis unit 400 from the input end 410, the filtered pure water is output from the pure water output end 420, and the obtained concentrated water can be output from the concentrated water output end 430; of course, the raw water can also enter the reverse osmosis unit 400 from the concentrated water output end 430, the filtered pure water is output from the pure water output end 420, and the obtained concentrated water can be output from the input end 410.

[0070] The drain valve 500 has a first input port 510, a second input port 520, and an output port 530.

[0071] The first input port 510 is communicated with the concentrated water output end 430, the second drain valve port 330 is communicated with the first input port 510, the second input port 520 is communicated with the input end 410, and 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 the reverse osmosis unit 400 can be discharged from the output port 530 to the concentrated water port of the water purifier.

[0072] By controlling the states of the water inlet valve 300 and the drain valve 500, the switching between the forward water flow and the reverse water flow of the reverse osmosis unit 400 can be realized, so that the reverse osmosis unit 400 can filter the raw water in both forward and reverse water flows to make full use of the reverse osmosis unit 400.

[0073] In the first state, the raw water enters the reverse osmosis unit 400 from the input end 410, the filtered pure water flows out from the pure water output end 420, and the obtained concentrated water flows out from the concentrated water output end 430, realizing the forward water flow.

[0074] In the second state, the raw water enters the reverse osmosis unit 400 from the concentrated water output end 430, the filtered pure water flows out from the pure water output end 420, and the obtained concentrated water flows out from the input end 410, realizing the reverse water flow.

[0075] It can be understood that the water purifier with a single reverse osmosis unit provided by the embodiment of the present utility model controls the states of the water inlet valve 300 having a water inlet valve port 310, a first drain valve port 320, and a second drain valve port 330, and the drain valve 500 having a first input port 510, a second input port 520, and an output port 530, so that the reverse osmosis unit 400 can be switched between normal water flow and reverse water flow, avoiding the phenomenon that the reverse osmosis unit 400 can only conduct water in one direction (either normal or reverse), resulting in the inability to utilize some of the filtration positions of the reverse osmosis unit 400. The reverse osmosis unit 400 can be fully utilized, its utilization rate can be improved, its service life can be extended, and the replacement frequency of the reverse osmosis unit 400 can be reduced, thereby reducing the use cost of the water purifier.

[0076] In the embodiment of the present utility model, the reverse osmosis unit 400 can be a reverse osmosis membrane filter element. When installed in the water purifier, the reverse osmosis membrane filter element has a higher utilization rate and a longer service life. Similarly, it is no longer necessary to frequently replace the reverse osmosis membrane filter element, thereby reducing the use cost.

[0077] Specifically, in some embodiments of the present utility model, the water inlet valve 300 includes a first water inlet valve 340 and a second water inlet valve 350.

[0078] The first water inlet valve 340 has a first water inlet valve port 341 and a first water outlet valve port 342, and the first water inlet valve port 341 is communicated with the pump outlet 220.

[0079] The second water inlet valve 350 has a second water inlet valve port 351 and a second water outlet valve port 352, and the second water inlet valve port 351 is communicated with the pump outlet 220.

[0080] The input end 410 is communicated with the first water outlet valve port 342, and the second water outlet valve port 352 is communicated with the concentrated water output end 430. When the first water inlet valve 340 is opened and the second water 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 reverse osmosis unit 400 from the input end 410; when the second water inlet valve 350 is opened and the first water 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 reverse osmosis unit 400 from the concentrated water output end 430. By controlling the opening or closing states of the first water inlet valve 340 and the second water inlet valve 350, the switching between the raw water flowing into the reverse osmosis unit 400 from the input end 410 and the raw water flowing into the reverse osmosis unit 400 from the concentrated water output end 430 can be controlled.

[0081] The drain valve 500 includes a first drain valve 540 and a second drain valve 550.

[0082] The first drain valve 540 has a first inlet 541 and a first outlet 542. The first inlet 541 communicates with the concentrated water output end 430, and the second water outlet valve port 352 communicates with the first inlet 541.

[0083] The second drain valve 550 has a second inlet 551 and a second outlet 552. The second inlet 551 communicates with the input end 410, and the second outlet 552 communicates with the first outlet 542. 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 the reverse osmosis unit 400 filters can flow out from the concentrated water output end 430 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 the reverse osmosis unit 400 filters can flow out from the input end 410 and then be discharged to the concentrated water port of the water purifier through the second outlet 552.

[0084] By controlling the opening or closing states of the first water inlet valve 340, the second water inlet valve 350, the first drain valve 540, and the second drain valve 550, the switching between the normal water passage and the reverse water passage of the reverse osmosis unit 400 is realized. While making full use of the reverse osmosis unit, improving its utilization rate, extending its service life, and reducing the use cost, it can also simplify the structures of the water inlet valve 300 and the drain valve 500, thereby simplifying the structure of the water purifier and further reducing its manufacturing cost.

[0085] That is to say, combined with Figure 1 , the dotted arrow indicates the flow direction of the concentrated water. In the first state, the main water inlet valve 100 is opened, the booster pump 200 is opened, the first water inlet valve 340 is opened, the second water inlet valve 350 is closed, the first drain valve 540 is opened, and the second drain valve 550 is closed. The raw water enters the booster pump 200 from the main water inlet valve 100, enters the reverse osmosis unit 400 from the input end 410 through the first water inlet valve 340. The pure water obtained after filtration flows from the pure water output end 420 to the pure water port of the water purifier, and the concentrated water obtained flows from the concentrated water output end 430 through the first drain valve 540 to the concentrated water port of the water purifier.

[0086] Combined with Figure 2, the dotted arrow indicates the flow direction of the concentrated water. In the second state, the total water inlet valve 100 is opened, the booster pump 200 is opened, the first water inlet valve 340 is closed, the second water inlet valve 350 is opened, the first drain valve 540 is closed, and the second drain valve 550 is opened. Raw water enters the booster pump 200 from the total water inlet valve 100, and enters the reverse osmosis unit 400 from the concentrated water output end 430 through the second water inlet valve 350. The purified water obtained after filtration flows from the purified water output end 420 to the purified water outlet of the water purifier, and the concentrated water obtained flows from the input end 410 through the second drain 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 drain valve 540, and the second drain valve 550, the switching between the first state and the second state is realized. The structure is simpler and the state switching is more accurate, which can improve the switching accuracy between normal water flow and reverse water flow, and ensure that the reverse osmosis unit 400 can work normally under high utilization rate.

[0087] Furthermore, in order to filter the concentrated water filtered by the reverse osmosis unit 400 again and increase the pressure of the raw water to improve the filtration efficiency and the utilization rate of the raw water, in some embodiments of the present invention, the water purifier further includes a waste water return valve 600.

[0088] The waste water return valve 600 has a return inlet 610 and a return outlet 620.

[0089] The return inlet 610 is communicated with the first discharge outlet 542 of the first drain valve 540 or the second discharge outlet 552 of the second drain valve 550, and the return outlet 620 is communicated with the pump inlet 210.

[0090] When the waste water return valve 600 is opened, after being filtered by the reverse osmosis unit 400, part of the concentrated water is discharged from the first discharge outlet 542 of the first drain valve 540 or the second discharge outlet 552 of the second drain valve 550, and then the concentrated water can flow back into the booster pump 200 from the return outlet 620 through the waste water return valve 600.

[0091] 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.

[0092] The waste water inlet 710 is communicated with the return inlet 610 of the waste water return valve 600, and the waste water outlet 720 is connected to the concentrated water outlet of the water purifier.

[0093] When the waste water valve 700 is opened, after being filtered by the reverse osmosis unit 400, the concentrated water is discharged from the first discharge outlet 542 of the first drain valve 540 or the second discharge outlet 552 of the second drain valve 550, and then the concentrated water can flow into the concentrated water outlet of the water purifier from the waste water inlet 710 through the waste water valve 700.

[0094] When the wastewater valve 700 is closed, after being filtered by the reverse osmosis unit 400, the concentrated water obtained is discharged from the first discharge outlet 542 of the first drain valve 540 or the second discharge outlet 552 of the second drain valve 550. Then, the concentrated water can only flow back into the booster pump 200 through the wastewater return valve 600 from the return outlet 620. In this way, all the concentrated water obtained after being filtered by the reverse osmosis unit 400 can flow back into the booster pump 200, further increasing the pressure of the raw water, and also further improving the filtration efficiency and the utilization rate of the raw water.

[0095] Of course, both the first drain valve 540 and the second drain valve 550 can be normally closed valves.

[0096] In some embodiments of the present utility model, the water purifier further includes a TDS measuring device 800 and a flow meter 810 arranged in series.

[0097] The flow meter 810 has a flow inlet 811 and a flow outlet 812, and the TDS measuring device 800 has a measuring inlet 801 and a measuring outlet 802. The flow outlet 812 is communicated with the measuring inlet 801.

[0098] The flow inlet 811 is communicated with the pure water output end 420 of the reverse osmosis unit 400, and the measuring outlet 802 is connected to the pure water outlet of the water purifier.

[0099] 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 the reverse osmosis unit 400, so as to enable the user to judge the quality of the pure water and improve the intelligence level of the water purifier. The flow meter 810 can measure the output flow of the pure water, and the user can accurately set the amount of purified water required each time, preventing the amount of purified water from being too much or too little, meeting the needs of the user, and also avoiding the over-operation of the reverse osmosis unit 400, thereby further prolonging the service life of the reverse osmosis unit 400.

[0100] In some embodiments of the present utility model, the water purifier further includes a check valve 820 and a purified water return valve 830 arranged in series.

[0101] The check valve 820 has a one-way inlet 821 and a one-way outlet 822, and the purified water return valve 830 has a net flow inlet 831 and a net flow outlet 832. The net flow outlet 832 is communicated with the one-way inlet 821.

[0102] The net flow inlet 831 is communicated with the pure water output end 420, and the one-way outlet 822 is communicated with the pump inlet 210.

[0103] When the pure water pressure at the 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 check valve 820, further pressurizing the raw water and reducing the pressure of the pure water output from the pure water outlet of the water purifier at the same time.

[0104] In some embodiments of the present utility model, the water purifier further includes a pre-filter 900 and a post-filter 910.

[0105] The pre-filter 900 is arranged at the front end of the main inlet valve 100 and communicates with the water inlet 110.

[0106] The post-filter 910 is arranged between the TDS measuring device 800 and the pure water outlet of the water purifier, communicating the measuring outlet 802 with the pure water outlet of the water purifier.

[0107] 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.

[0108] After the pure water is output from the pure water output end 420 of the reverse osmosis unit 400, the post-filter 910 can adjust the taste of the pure water.

[0109] 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 provided to save manufacturing costs.

[0110] In some embodiments of the present utility model, it further includes a high-pressure switch 840 and a check valve 850.

[0111] The check valve 850 has a check valve inlet 841 and a check valve outlet 842. The check valve inlet 841 is connected to the post-filter 910, and the check valve outlet 842 is connected to the pure water outlet of the water purifier.

[0112] The high-pressure switch 840 is arranged between the check valve 850 and the pure water outlet of the water purifier.

[0113] When the pressure of the pure water output from the 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 purified water return valve 830, enabling the pure water to flow back to the booster pump 200 to reduce the pressure.

[0114] 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.

[0115] CombinedFigure 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 reverse osmosis unit 400 from the input end 410. The pure water obtained after filtration flows from the pure water output end 420 to the pure water port of the water purifier. The concentrated water obtained flows to the concentrated water port of the water purifier after being reversed by the three-way drain reversing valve from the concentrated water output end 430.

[0116] 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 reverse osmosis unit 400 from the concentrated water output end 430. The pure water obtained after filtration flows from the pure water output end 420 to the pure water port of the water purifier. The concentrated water obtained flows to the concentrated water port of the water purifier after being reversed by the three-way drain reversing valve from the input end 410.

[0117] The inlet valve 300 or the drain valve 500 can alternately open and close the two flow channels as needed to achieve the fluid switching function. The stroke is short, the opening and closing are fast, ensuring the switching efficiency between the normal water flow and the reverse water flow of the reverse osmosis unit 400.

[0118] 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 means that the first feature is at a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature can be that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is at a lower horizontal height than the second feature.

[0119] In the description of this specification, the description referring to terms such as "preferred embodiment", "further embodiment", "some embodiments", "other embodiments" or "specific examples", etc. means 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 representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can 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.

[0120] 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 single reverse osmosis unit, 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; The water inlet valve has a water inlet valve port, a first drain valve port and a second drain valve port, and the pump outlet is connected to the water inlet valve port. A reverse osmosis unit having an input end, a pure water output end and a concentrated water output end, wherein the input end is connected to the first drain valve port, the second drain valve port is connected to the concentrated water output end, and the pure water output end 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, the second drain valve port is connected to the first input port, the second input port is connected to the input end, 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 unit from the input end, 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, thereby achieving positive water flow. In the second state, the raw water enters the reverse osmosis unit from the concentrated water output end, the pure water obtained after filtration flows out from the pure water output end, and the concentrated water obtained flows out from the input end, realizing reverse water flow.

2. The water purifier with a single reverse osmosis unit according to claim 1, characterized in that: 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 input end is connected to the first water outlet valve port, and the second water outlet valve port is connected to the 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 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 communicated with the input end, the second outlet is communicated with 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 drain valve and the second drain valve, the reverse osmosis unit is switched between forward water flow and reverse water flow.

3. The water purifier with a single reverse osmosis unit according to claim 2, characterized in that: 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, enters the reverse osmosis unit from the input end through the first water inlet valve, and the pure water obtained after filtration flows from the pure water output end to the pure water outlet of the water purifier, and the concentrated water obtained flows from the concentrated water output end 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 concentrated water output end through the second water inlet valve. The pure water obtained after filtration flows from the pure water output end to the pure water outlet of the water purifier, and the concentrated water obtained flows from the input end to the concentrated water outlet of the water purifier after passing through the second drain valve.

4. The water purifier with a single reverse osmosis unit according to claim 3, characterized in that: 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 with a single reverse osmosis unit according to claim 4, characterized in that: 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 with a single reverse osmosis unit according to claim 5, characterized in that: 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 communicated with the pure water output end, and the measurement outlet is connected to the pure water inlet of the water purifier.

7. The water purifier with a single reverse osmosis unit according to claim 6, characterized in that: 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 communicated with the pure water output end, and the one-way outlet is communicated with the pump inlet.

8. The water purifier with a single reverse osmosis unit according to claim 7, characterized in that: 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 with a single reverse osmosis unit according to claim 8, characterized in that: 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 with a single reverse osmosis unit according to claim 1, characterized in that: 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.

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