Combined pure water washing membrane water purifier

Abstract

The utility model discloses a combined type pure water washing membrane water purifier which comprises a front filter element, a first water inlet electromagnetic valve, a booster pump, a reverse osmosis membrane filter element, a concentrated water electromagnetic valve, a rear filter element and a water faucet, and further comprises a first-order cleaning loop, a second-order cleaning loop, a third-order cleaning loop and a fourth-order cleaning loop, the other end of the filter element is connected between the reverse osmosis membrane filter element and the rear filter element; one end of the second-order cleaning loop is connected between the booster pump and the reverse osmosis membrane filter element, and the other end of the second-order cleaning loop is connected between the reverse osmosis membrane filter element and the rear filter element. According to the water purifier with the combined pure water washing membrane, the problem that the TDS of the first cup of water cannot be thoroughly solved due to the volume of a pressure barrel, or the problem that the installation space under a cabinet cannot be large due to the large size of the machine caused by the adoption of a large-volume pressure barrel is solved.

Description

Technical Field

[0001] The utility model relates to a reverse osmosis water purifier, and more specifically to a water purifier with a combined pure water washing membrane. Background Art

[0002] With the improvement of people's living standards, the requirements for water quality are also getting higher and higher. Among them, reverse osmosis water purifiers can effectively ensure the safety of filtered water quality and are increasingly recognized and favored by the market. In recent years, large-flux reverse osmosis water purifiers have become the first choice for consumers.

[0003] The so-called large-flux reverse osmosis water purifier refers to a water purifier that does not need to increase a large-volume water storage pressure barrel to store the filtered water for daily use. Generally speaking, a reverse osmosis machine with a daily water production of more than 400 gallons can be called a large-flux reverse osmosis water purifier. Now, some companies in the market have achieved a daily water production of 2000 gallons, which can meet most daily needs such as washing vegetables, washing dishes, and drinking. However, all such large-flux machines have a common problem: because the reverse osmosis membrane filter element is relatively large, there is more residual tap water at the front end of the membrane. After the machine stops making water, the front end of the reverse osmosis membrane loses the working pressure, resulting in the tap water with a high TDS value at the front end of the membrane and the concentrated water at the concentrated water end of the membrane penetrating into the water production end of the membrane, causing the TDS value at the water production end to become higher and higher over time, resulting in the first glass of water not meeting the drinking water quality standard.

[0004] In response to this common problem, manufacturers usually recommend that consumers drain the first 2 minutes of water when opening the faucet again after a period of standby, which results in more water waste for machines with a larger flux.

[0005] To solve the problem of the first glass of water, the current practice in the market is to add a water storage pressure barrel inside the machine. After shutdown, the water in the pressure barrel is used to flush the front end of the reverse osmosis membrane to replace the tap water at the front end of the membrane with pure water. However, because there is more residual water stored at the front end and the concentrated water end of the membrane, and an airbag needs to be set inside the pressure barrel, the actual volume of pure water that the water storage pressure barrel can store only accounts for about 50% of the volume of the pressure barrel. At this time, a larger volume pressure barrel is required to ensure the effect of washing the membrane, which also leads to a larger volume of the machine and difficulty in installing it under the cabinet, making it difficult to be accepted by the market. If a small-volume pressure barrel is used, the first glass of water will still be too high due to insufficient volume of the pressure barrel. Summary of the Utility Model

[0006] Aiming at the deficiencies of the existing technology, the purpose of the present utility model is to provide a water purifier with a combined pure water washing membrane, which is provided with a small pressure bucket and multiple groups of solenoid valves inside the machine. After the machine stops, according to the electric control program, the opening and closing of the solenoid valves are controlled. First, the water mixed with pure water produced by the reverse osmosis membrane and tap water is used to wash the reverse osmosis membrane for a period of time. In the first step, after the TDS at the front end of the reverse osmosis membrane is greatly reduced, in the second step, the pure water stored in the small pressure bucket is used to wash the reverse osmosis membrane. In this way, the volume of the pressure bucket can be reduced by more than half compared with similar water purifiers on the market to obtain the first cup of qualified water with a low TDS value. At the same time, because the reverse osmosis membrane is in pure water after being washed with pure water, the service life of the membrane is prolonged.

[0007] To achieve the above purpose, the present utility model provides the following technical solutions: A water purifier with a combined pure water washing membrane, including a pre-filter, a first inlet solenoid valve, a booster pump, a reverse osmosis membrane filter element, a concentrated water solenoid valve, a post-filter and a faucet. The pre-filter, the first inlet solenoid valve, the booster pump, the reverse osmosis membrane filter element, the post-filter and the faucet are connected in sequence. The water inlet of the concentrated water solenoid valve is connected to the reverse osmosis membrane filter element. Raw water enters from the pre-filter, is filtered by the pre-filter, pressurized by the booster pump, and the concentrated water flows out from the water outlet of the concentrated water solenoid valve after being filtered by the reverse osmosis membrane filter element. The pure water is then filtered by the post-filter and flows out from the faucet. It is characterized in that it further includes:

[0008] A first-stage cleaning circuit, one end of which is connected between the first inlet solenoid valve and the booster pump, and the other end is connected between the reverse osmosis membrane filter element and the post-filter, for guiding the pure water output by the reverse osmosis membrane filter element back to the water outlet of the first inlet solenoid valve, so that the pure water is mixed with the water passing through the pre-filter; A second-stage cleaning circuit, one end of which is connected between the booster pump and the reverse osmosis membrane filter element, and the other end is connected between the reverse osmosis membrane filter element and the post-filter, for outputting pure water to displace the water at the front end and the rear end of the reverse osmosis membrane filter element, and soaking the reverse osmosis membrane filter element in pure water.

[0009] As a further improvement of the present utility model, the first-stage cleaning circuit includes a first one-way valve, a third one-way valve and a second inlet solenoid valve. The first one-way valve is connected between the first inlet solenoid valve and the booster pump to guide water to flow from the first inlet solenoid valve to the booster pump. The third one-way valve is connected between the reverse osmosis membrane filter element and the second inlet solenoid valve to guide water to flow from the reverse osmosis membrane filter element to the second inlet solenoid valve.

[0010] As a further improvement of the present utility model, the second-stage cleaning circuit includes a pressure storage water bucket, a third inlet solenoid valve and a second one-way valve. The water inlet end of the second one-way valve is connected to the reverse osmosis membrane filter element, and the water outlet end of the second one-way valve is connected between the pressure storage water bucket and the water inlet end of the third inlet solenoid valve. The water outlet end of the third inlet solenoid valve is connected between the booster pump and the reverse osmosis membrane filter element.

[0011] As a further improvement of the present utility model, a TDS probe is also connected between the pre-filter element and the first inlet solenoid valve.

[0012] As a further improvement of the present utility model, a high-pressure switch is also connected between the water faucet and the post-filter element.

[0013] The beneficial effects of the present utility model are as follows. Through the setting of the first-order cleaning circuit and the second-order cleaning circuit, it effectively overcomes the problem that the machines on the market simply use the pressure barrel to wash the membrane. Due to the volume of the pressure barrel, the problem of high TDS value of the first glass of water cannot be completely solved, or a large-volume pressure barrel is used, resulting in a large volume of the machine and unable to meet the requirement of a large installation space under the cabinet. The present utility model adopts a multi-group solenoid valve combination flushing method. First, the water output from the original reverse osmosis membrane is used to reduce the TDS value of most of the water at the front end of the membrane, and then a small amount of pure water is used to wash the membrane, completely solving the problems on the market. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the water circuit of the reverse osmosis water purifier in the present utility model;

[0015] Figure 2 It is a schematic diagram of the water circuit of the reverse osmosis water purifier in the water production state in the present utility model;

[0016] Figure 3 It is a schematic diagram of the water circuit for washing the membrane in the first stage after the machine stops in the present utility model;

[0017] Figure 4 It is a schematic diagram of the water circuit for washing the membrane in the second stage after the machine stops in the present utility model. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0018] The following will further elaborate on the present utility model in combination with the embodiments given in the drawings.

[0019] Referring to Figure 1 As shown, a combined pure water membrane washing water purifier in this embodiment includes a pre-filter element 1, a first inlet solenoid valve 3, a booster pump 5, a reverse osmosis membrane filter element 6, a concentrated water solenoid valve 7, a post-filter element 9, and a water faucet 11. The pre-filter element 1, the first inlet solenoid valve 3, the booster pump 5, the reverse osmosis membrane filter element 6, the post-filter element 9, and the water faucet 11 are connected in sequence. The water inlet of the concentrated water solenoid valve 7 is connected to the reverse osmosis membrane filter element 6. Raw water enters from the pre-filter element 1, is filtered by the pre-filter element 1, pressurized by the booster pump 5, and the concentrated water after being filtered by the reverse osmosis membrane filter element 6 flows out from the water outlet of the concentrated water solenoid valve 7. The pure water is then filtered by the post-filter element 9 and flows out from the water faucet 11. It further includes:

[0020] The first - order cleaning circuit, one end of the first - order cleaning circuit is connected between the first water inlet solenoid valve 3 and the booster pump 5, and the other end is connected between the reverse osmosis membrane filter element 6 and the post - filter element 9, and is used to guide the pure water output by the reverse osmosis membrane filter element 6 back to the water outlet of the first water inlet solenoid valve 3, so that the pure water is mixed with the water passing through the pre - filter element 1;

[0021] The second - order cleaning circuit, one end of the second - order cleaning circuit is connected between the booster pump 5 and the reverse osmosis membrane filter element 6, and the other end is connected between the reverse osmosis membrane filter element 6 and the post - filter element 9, and is used to output pure water to displace the water at the front end and the back end of the reverse osmosis membrane filter element 6, and soak the reverse osmosis membrane filter element 6 in pure water. During the use of the water purifier in this embodiment, after use, through the action of the first - order cleaning circuit and the second - order cleaning circuit, after stopping use, the reverse osmosis membrane filter element 6 is soaked in pure water. In this way, the waste of water when the water purifier starts is effectively reduced. At the same time, since only the second - order cleaning circuit uses an additional water source, the amount of water used is small, so the volume of the pressure bucket for storing the water source can be set smaller. Thus, the problem that a large - volume pressure bucket makes the machine bulky and cannot meet the large installation space under the cabinet is well solved.

[0022] As a specific embodiment of the improvement, the first - order cleaning circuit includes a first check valve 4, a third check valve 8 and a second water inlet solenoid valve 12. The first check valve 4 is connected between the first water inlet solenoid valve 3 and the booster pump 5 to guide water to flow from the first water inlet solenoid valve 3 to the booster pump 5. The third check valve 8 is connected between the reverse osmosis membrane filter element 6 and the second water inlet solenoid valve 12 to guide water to flow from the reverse osmosis membrane filter element 6 to the second water inlet solenoid valve 12. Through the setting of the above - mentioned structure, the pure water can be simply and effectively guided to flow back to clean the reverse osmosis membrane filter element 6 by the action of the first check valve 4, the third check valve 8 and the second water inlet solenoid valve 12.

[0023] As a specific embodiment of the improvement, the second - order cleaning circuit includes a pressure storage water bucket 14, a third water inlet solenoid valve 13 and a second check valve 15. The water inlet end of the second check valve 15 is connected to the reverse osmosis membrane filter element 6, and the water outlet end of the second check valve 15 is connected between the pressure storage water bucket 14 and the water inlet end of the third water inlet solenoid valve 13. The water outlet end of the third water inlet solenoid valve 13 is connected between the booster pump 5 and the reverse osmosis membrane filter element 6. Through the setting of the pressure storage water bucket 14, the third water inlet solenoid valve 13 and the second check valve 15, the pressure storage water bucket 14 can store pure water during the normal use of the water purifier, and then output pure water to clean the reverse osmosis membrane filter element 6 when second - order cleaning is required.

[0024] As a specific implementation of the improvement, a TDS probe 2 is also connected between the pre-filter element 1 and the first inlet solenoid valve 3. By setting the TDS probe 2, the TDS value at the front end of the reverse osmosis membrane filter element 6 can be simply and effectively detected. Based on this, the control program can automatically set the length of the flushing time according to the value of the inlet TDS probe, and the concentrated water solenoid valve has an adjustable flow rate, and automatically adjusts the concentrated water flow rate according to the value of the inlet TDS probe.

[0025] As a specific implementation of the improvement, a high-pressure switch 10 is also connected between the faucet 11 and the post-filter element 9. By setting the high-pressure switch 10, the pressure between the faucet 11 and the post-filter element 9 can be effectively detected. Based on this, when the pressure storage bucket 14 is full of water, when the high-pressure switch 10 monitors the reached pressure value, the machine stands by.

[0026] Based on the above components that make up the water purifier, the water purifier of this embodiment has the following several working states, specifically:

[0027] Pure water production state: As Figure 2 shown, when making water, the raw water enters the pre-filter element 1. At this time, the first inlet solenoid valve 3 is in the open state, the second inlet solenoid valve 12 and the third inlet solenoid valve 13 are in the closed state. The water is pressurized by the booster pump 5 and then pressed into the reverse osmosis membrane filter element 6. The pure water flows out from the water production end of the reverse osmosis membrane filter element 6 and enters the interior of the post-filter element 9, and finally flows out from the water outlet of the water outlet faucet 11. This is the normal water use state. At the same time, because the water outlet of the reverse osmosis membrane filter element 6 is connected to the water inlet of the second one-way valve 15, and the water inlet of the pressure storage bucket 14 is connected to the water outlet of the second one-way valve 15, so part of the pure water enters the pressure storage 14 until the water outlet of the water outlet faucet 11 is closed. When the pressure storage bucket 14 is full of water and the high-pressure switch 10 monitors the reached pressure value, the machine stands by.

[0028] The first-stage membrane washing state: As Figure 3As shown, when the water outlet faucet 11 is closed and the machine stops, the first-stage membrane washing is started according to the electric control program settings at this time. The flushing time in this stage can be set accordingly according to the value of the inlet water TDS probe 2. When entering this stage of membrane washing, the first inlet solenoid valve 3 and the second inlet solenoid valve 12 are opened simultaneously, the third inlet solenoid valve 13 is closed, and the booster pump 5 is started. The raw water enters from the pre-filter 1 into the booster pump 5, and is pressurized by the booster pump 5 and enters the water inlet of the reverse osmosis membrane filter element 6. At this time, the water outlet faucet 11 is closed, and the pure water enters from the water inlet of the second solenoid valve 12. The water reaching the water outlet of the second solenoid valve 12 and the water outlet of the first inlet solenoid valve 3 are mixed. At this time, the mixed water is the mixture of pure water and the water passing through the pre-filter 1, and the TDS value of the mixed water is much smaller than the TDS value of the raw water. Actual test verification shows that it is only less than 2 / 5 of the raw water value. At this time, the TDS value of the water at the water inlet of the reverse osmosis membrane filter element 6 is greatly reduced, and at the same time, the concentrated water discharged from the reverse osmosis membrane filter element 6 is also greatly reduced. In this stage, the water circuit of the original water purifier is used to perform the first-stage flushing of the reverse osmosis membrane. After the flushing, the TDS values at the front end and the concentrated water end of the membrane have been greatly reduced.

[0029] Second-stage membrane washing state: After the first-stage membrane washing, the program enters the second-stage membrane washing. As Figure 4 shown, in this stage, the pure water in the pressure storage water tank 14 is used to flush the reverse osmosis membrane filter element 6 again. After the first-stage membrane washing, after the time interval set by the program, at this time, the first inlet solenoid valve 3 and the second inlet solenoid valve 12 are closed simultaneously, the third inlet solenoid valve 13 is opened, and the booster pump 5 stops running. When the third inlet solenoid valve 13 is opened, the pure water in the pressure storage water tank 14 flows through the third inlet solenoid valve 13 to the front end of the reverse osmosis membrane filter element 6 and slowly discharges from the water outlet of the concentrated water solenoid valve 7, replacing the water at the front end of the reverse osmosis filter element 6, so that the reverse osmosis membrane filter element 6 is immersed in pure water, and at the same time, the concentrated water end is also replaced with pure water, which not only makes the first glass of water reach the qualified water, but also protects the reverse osmosis membrane filter element and the concentrated water solenoid valve, and extends the service life of the filter element.

[0030] The above is only the preferred implementation mode of the present invention. The protection scope of the present invention is not limited to the above embodiments. All technical solutions falling within the idea of the present invention belong to the protection scope of the present invention. It should be pointed out that for those of ordinary skill in the art in this technical field, several improvements and refinements made without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. A water purifier with a combined pure water washing membrane, comprising a pre-filter (1), a first inlet solenoid valve (3), a booster pump (5), a reverse osmosis membrane filter element (6), a concentrated water solenoid valve (7), a post-filter (9) and a faucet (11). The pre-filter (1), the first inlet solenoid valve (3), the booster pump (5), the reverse osmosis membrane filter element (6), the post-filter (9) and the faucet (11) are connected in sequence. The water inlet of the concentrated water solenoid valve (7) is connected to the reverse osmosis membrane filter element (6). Raw water enters from the pre-filter (1), is filtered by the pre-filter (1), pressurized by the booster pump (5), and the concentrated water after being filtered by the reverse osmosis membrane filter element (6) flows out from the water outlet of the concentrated water solenoid valve (7). The pure water is filtered by the post-filter (9) and then flows out from the faucet (11). It is characterized in that: It further includes: A first - order cleaning circuit, one end of which is connected between the first inlet solenoid valve (3) and the booster pump (5), and the other end is connected between the reverse osmosis membrane filter element (6) and the post - filter element (9), for guiding the pure water output by the reverse osmosis membrane filter element (6) back to the water outlet of the first inlet solenoid valve (3), so that the pure water is mixed with the water passing through the pre - filter element (1); A second - order cleaning circuit, one end of which is connected between the booster pump (5) and the reverse osmosis membrane filter element (6), and the other end is connected between the reverse osmosis membrane filter element (6) and the post - filter element (9), for outputting pure water to displace the water at the front end and the back end of the reverse osmosis membrane filter element (6), and immersing the reverse osmosis membrane filter element (6) in pure water.

2. The water purifier with a combined pure water washing membrane according to claim 1, characterized in that: The first - order cleaning circuit includes a first check valve (4), a third check valve (8) and a second inlet solenoid valve (12). The first check valve (4) is connected between the first inlet solenoid valve (3) and the booster pump (5) to guide water to flow from the first inlet solenoid valve (3) to the booster pump (5). The third check valve (8) is connected between the reverse osmosis membrane filter element (6) and the second inlet solenoid valve (12) to guide water to flow from the reverse osmosis membrane filter element (6) to the second inlet solenoid valve (12).

3. The water purifier with a combined pure water washing membrane according to claim 2, characterized in that: The second - order cleaning circuit includes a pressure water storage tank (14), a third inlet solenoid valve (13) and a second check valve (15). The water inlet end of the second check valve (15) is connected to the reverse osmosis membrane filter element (6), and the water outlet end of the second check valve (15) is connected between the pressure water storage tank (14) and the water inlet end of the third inlet solenoid valve (13). The water outlet end of the third inlet solenoid valve (13) is connected between the booster pump (5) and the reverse osmosis membrane filter element (6).

4. The combined pure water washing membrane water purifier according to claim 1 or 2 or 3, characterized in that: A TDS probe (2) is also connected between the pre - filter element (1) and the first inlet solenoid valve (3).

5. The combined pure water washing membrane water purifier according to claim 1 or 2 or 3, characterized in that: A high - pressure switch (10) is also connected between the faucet (11) and the post - filter element (9).

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