Water purifier with backflow function

Abstract

The utility model discloses a water purifier with a backflow function, which comprises a water inlet waterway with a pressure reduction function, a backflow water pipe and a membrane filter element, a water outlet of the water inlet waterway is communicated with a water inlet of the membrane filter element, a water inlet of the backflow water pipe is communicated with a water outlet of the membrane filter element, and a water outlet of the backflow water pipe is communicated with the water inlet waterway. Tap water enters the membrane filter element through the water inlet path to be filtered, so that pure water is obtained, when the water purifier is started again for use after being standby for a period of time, the pure water enters the water inlet path through the backflow water pipe and is mixed with the tap water in the water inlet path, and meanwhile, the water inlet path has a pressure reduction function, so that the water inlet pressure can be reduced, and the water quality is improved. The water pressure of the water outlet of the backflow water pipe is increased while the flow of tap water is reduced, so that the flow of pure water in the backflow water pipe is increased, and the TDS of mixed water entering the membrane filter element is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of water purifiers, in particular to a water purifier with a reflux function. Background Art

[0002] With the improvement of people's living standards, people are paying more and more attention to water hygiene. It has become a trend to equip families with water purifiers. Water purifiers can easily produce pure water for users to drink. Water purifiers mainly rely on RO membrane filters to filter pure water. When the water purifier is on standby, there are raw water, pure water and concentrated water in the RO membrane filter at the same time. The raw water and concentrated water are both in front of the membrane of the RO membrane filter, and the pure water is behind the membrane of the RO membrane filter. There is natural infiltration between the raw water, concentrated water and pure water, which leads to too high TDS in the pure water. The TDS value of the first cup of water taken out after the water purifier is on standby is too high.

[0003] Conventional pure water reflux technology sets a pipeline at the pure water end of the RO membrane filter element to allow the pure water to flow back to the pre-treatment water path, thereby reducing the problem of too high TDS value in the first cup of water. However, the effect of reducing the TDS of the first cup of water is not good.

[0004] Therefore, how to better reduce the TDS value of the first cup of water after the water purifier is turned on in standby mode has become the focus of attention of those skilled in the art and related personnel. Utility Model Content

[0005] In view of this, the utility model provides a water purifier with a reflux function, which is used to solve the problem in the prior art that the TDS reduction effect of the first cup of water is not good after the water purifier is turned on and off.

[0006] In order to achieve one or part or all of the above-mentioned purposes or other purposes, the utility model proposes a water purifier with a reflux function, including an inlet waterway with a pressure reducing function, a reflux water pipe and a membrane filter element, the water outlet of the inlet waterway is connected to the water inlet of the membrane filter element, the water inlet of the reflux water pipe is connected to the water outlet of the membrane filter element, and the water outlet of the reflux water pipe is connected to the inlet waterway.

[0007] Based on the above technical solution, when preparing pure water, tap water enters the membrane filter element through the water inlet waterway for filtration to obtain pure water. When the water purifier is turned on again after being on standby for a period of time, pure water enters the water inlet waterway through the return water pipe and mixes with the tap water in the water inlet waterway. At the same time, since the water inlet waterway has a pressure reducing function, it can reduce the inlet water pressure, reduce the flow rate of tap water, and increase the water pressure at the outlet of the return water pipe, thereby increasing the flow rate of pure water in the return water pipe, thereby reducing the TDS of the mixed water entering the membrane filter element.

[0008] Preferably, the water inlet circuit includes a first water inlet passage, a first water inlet pipe and a second water inlet pipe, the water inlet of the first water inlet pipe and the water inlet of the second water inlet pipe are both connected to the first water inlet passage, and the water outlet of the first water inlet pipe and the water outlet of the second water inlet pipe are both connected to the water inlet of the membrane filter element.

[0009] Based on the above technical solution, the water inlet waterway is divided into three waterways to facilitate the control of different waterways.

[0010] Preferably, a first solenoid valve and a first pressure reducing valve are provided on the first water inlet pipe, and a third solenoid valve is provided on the second water inlet pipe.

[0011] Based on the above technical solution, the first solenoid valve and the third solenoid valve are used to control the on-off of the first water inlet pipe and the second water inlet pipe respectively.

[0012] Preferably, the third solenoid valve is used to control the on-off of the second water inlet pipe when preparing pure water, the first solenoid valve is used to control the on-off of the first water inlet pipe when the reflux pipe is working, and the first pressure reducing valve is used to control the water pressure when the first water inlet pipe is inletting water.

[0013] Based on the above technical solution, when preparing pure water, the third solenoid valve is opened, and the first solenoid valve, the first pressure reducing valve and the second solenoid valve are closed. During reflux, the second solenoid valve, the first solenoid valve and the first pressure reducing valve are opened, and the third solenoid valve is closed, so that the pure water flows back into the water inlet circuit to reduce the TDS of the mixed water.

[0014] Preferably, a fifth solenoid valve is provided on the first water inlet passage, a second pressure reducing valve is provided on the first water inlet pipe, and a fourth solenoid valve is provided on the second water inlet pipe.

[0015] Based on the above technical solution, the opening and closing of the first water inlet pipe and the second water inlet pipe are controlled by the fifth solenoid valve and the fourth solenoid valve respectively.

[0016] Preferably, the fifth solenoid valve is used to control the on-off of the first water inlet passage, the fourth solenoid valve is used to control the on-off of the second water inlet pipe when preparing pure water, and the second pressure reducing valve is used to control the water pressure when the first water inlet pipe is inletting water.

[0017] Based on the above technical solution, when preparing pure water, the fifth solenoid valve and the fourth solenoid valve are opened, and the second pressure reducing valve and the second solenoid valve are closed. During reflux, the fifth solenoid valve, the second solenoid valve and the second pressure reducing valve are opened, and the fourth solenoid valve is closed, so that the pure water flows back into the water inlet circuit to reduce the TDS of the mixed water.

[0018] Preferably, a sixth solenoid valve and a concentrated water solenoid valve are provided on the water inlet waterway, the sixth solenoid valve is used to control the on-off of the water inlet waterway, and the concentrated water solenoid valve is used to limit the flow of the water inlet waterway.

[0019] Based on the above technical solution, when preparing pure water, open the sixth solenoid valve and the concentrated water solenoid valve, and close the second solenoid valve. During reflux, open the sixth solenoid valve and close the concentrated water solenoid valve, so that the pure water flows back into the water inlet circuit to reduce the TDS of the mixed water.

[0020] Preferably, a second solenoid valve and a check valve are provided on the return water pipe, and a booster pump is also provided on the water inlet waterway, and the booster pump is located between the check valve and the membrane filter element.

[0021] Based on the above technical solution, a booster pump is provided to increase the water pressure of the water entering the membrane filter element so that the membrane filter element can produce water under normal working pressure.

[0022] Preferably, the water purifier with reflux function comprises an outlet waterway, a water inlet of the outlet waterway is connected to a water outlet of the membrane filter element, and a water inlet of the reflux water pipe is connected to the outlet waterway.

[0023] Based on the above technical solution, the pure water in the membrane filter element is discharged through the water outlet waterway.

[0024] Preferably, the water purifier with reflux function comprises a concentrated water channel, and a water inlet of the concentrated water channel is connected to a concentrated water outlet of the membrane filter element.

[0025] Based on the above technical solution, the concentrated water in the membrane filter element is discharged through the concentrated water channel.

[0026] Implementing the embodiments of the present utility model will have the following beneficial effects:

[0027] After adopting the above-mentioned water purifier with reflux function, when preparing pure water, tap water enters the membrane filter element through the water inlet waterway for filtration, thereby obtaining pure water. When the water purifier is turned on again after being on standby for a period of time, the pure water enters the water inlet waterway through the reflux water pipe and mixes with the tap water in the water inlet waterway. At the same time, since the water inlet waterway has a pressure reducing function, the water pressure of the water inlet can be reduced. While reducing the flow rate of tap water, the water pressure at the outlet of the reflux water pipe is increased, thereby increasing the flow rate of pure water in the reflux water pipe, thereby reducing the TDS of the mixed water entering the membrane filter element, solving the problem of poor TDS reduction effect of the first cup of water after the water purifier is turned on standby in the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0029] in:

[0030] Figure 1 This is a schematic diagram of the overall structure of a water purifier with a reflux function in Example 1;

[0031] Figure 2 This is a schematic diagram of the overall structure of a water purifier with a reflux function in Example 2;

[0032] Figure 3 This is a schematic diagram of the overall structure of a water purifier with a reflux function in Example 3.

[0033] Explanation of the reference numerals in the accompanying drawings: 1. water inlet circuit; 11. first solenoid valve; 12. first pressure reducing valve; 121. concentrated water solenoid valve; 122. second pressure reducing valve; 13. booster pump; 14. first water inlet passage; 15. first water inlet pipe; 16. second water inlet pipe; 17. third solenoid valve; 18. fourth solenoid valve; 2. reflux pipe; 21. second solenoid valve; 22. check valve; 3. membrane filter element; 4. water outlet circuit; 5. concentrated water circuit; 6. fifth solenoid valve; 7. sixth solenoid valve. DETAILED DESCRIPTION

[0034] In order to facilitate understanding of the present application, the present application will be described more fully below with reference to the relevant drawings. Embodiments of the present application are provided in the drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive.

[0035] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0036] It is understood that the singular forms "a", "an" and "said / the" may also include plural forms, unless the context clearly indicates otherwise. It should also be understood that the terms "include / comprise" or "have" etc. specify the presence of stated features, wholes, steps, operations, components, parts or combinations thereof, but do not exclude the possibility of the presence or addition of one or more other features, wholes, steps, operations, components, parts or combinations thereof.

[0037] It should be noted that when an element is considered to be "connected" to another element, it can be directly connected to another element or there may be a centered element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are only for illustrative purposes. In the present utility model, the orientation or position relationship indicated by the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inside", "outside", "middle", "vertical", "horizontal", "lateral", "longitudinal" and the like is based on the orientation or position relationship shown in the accompanying drawings. These terms are mainly for better describing the present utility model and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation. In addition, the above-mentioned part of the terms may be used to express other meanings in addition to being used to express orientation or position relationship, for example, the term "upper" may also be used to express a certain dependency or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in the present utility model can be understood according to the specific circumstances.

[0038] In addition, the terms "disposed", "provided with", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection, or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, elements, or components. For those of ordinary skill in the art, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0039] Embodiment 1:

[0040] Reference Figure 1The embodiment of the utility model proposes a water purifier with a reflux function, including an inlet waterway 1, a reflux water pipe 2 and a membrane filter element 3, the water outlet of the inlet waterway 1 is connected with the water inlet of the membrane filter element 3, the inlet waterway 1 is provided with a first solenoid valve 11, a first pressure reducing valve 12 and a booster pump 13, the first pressure reducing valve 12 is located between the first solenoid valve 11 and the booster pump 13, the water inlet of the reflux water pipe 2 is connected with the water outlet of the membrane filter element 3, the water outlet of the membrane filter element 3 is connected with the inlet waterway 1, and is located between the first solenoid valve 11 and the booster pump 13, the reflux water pipe 2 is provided with a second solenoid valve 21 and a check valve 22, wherein the booster pump 13 is used to increase the water pressure of the water inlet of the membrane filter element 3, so that the membrane filter element 3 can make water under normal working pressure, and the membrane filter element 3 is used to filter tap water to prepare pure water, and then flow out from the water outlet of the membrane filter element 3.

[0041] Reference Figure 1 The water inlet circuit 1 includes a first water inlet passage 14, a first water inlet pipe 15 and a second water inlet pipe 16. The water inlet of the first water inlet pipe 15 and the water inlet of the second water inlet pipe 16 are both connected to the first water inlet passage 14, the water outlet of the first water inlet pipe 15 and the water outlet of the second water inlet pipe 16 are both connected to the water inlet of the membrane filter element 3, the first solenoid valve 11 and the first pressure reducing valve 12 are both arranged on the first water inlet pipe 15, and the second water inlet pipe 16 is provided with a third solenoid valve 17.

[0042] Reference Figure 1 The water purifier with reflux function includes an outlet waterway 4 and a concentrated water waterway 5. The water inlet of the outlet waterway 4 is connected to the water outlet of the membrane filter element 3, the water inlet of the reflux water pipe 2 is connected to the outlet waterway 4, and the water inlet of the concentrated water waterway 5 is connected to the concentrated water outlet of the membrane filter element 3, thereby facilitating the discharge of the concentrated water in the membrane filter element 3.

[0043] Reference Figure 1When preparing pure water, the third solenoid valve 17 and the booster pump 13 are opened, and the first solenoid valve 11, the first pressure reducing valve 12 and the second solenoid valve 21 are closed. The tap water enters the membrane filter element 3 through the water inlet waterway 1, and is filtered by the membrane filter element 3 to obtain pure water. The pure water flows out through the water outlet waterway 4 for users to drink. When the water purifier is turned on again after a period of standby, the first solenoid valve 11, the first pressure reducing valve 12, the booster pump 13 and the second solenoid valve 21 are opened, and the third solenoid valve 17 is closed. The pure water in the water outlet waterway 4 enters the water inlet waterway 1 through the reflux water pipe 2 and is mixed with the tap water in the water inlet waterway 1. , thereby reducing the TDS value of the membrane filter element 3. At the same time, the first pressure reducing valve 12 can reduce the water pressure of the water inlet, reduce the flow rate of tap water, and reduce the water pressure at the outlet of the reflux water pipe 2, thereby increasing the flow rate of pure water in the reflux water pipe 2, thereby reducing the TDS of the mixed water entering the booster pump 13, so that after the membrane filter element 3 stops making water, the concentration of concentrated water on one side of the membrane filter element 3 is greatly reduced, avoiding the conventional water purifier without pure water reflux from stopping water production and standing still, causing the TDS of one side of the pure water of the membrane filter element 3 to be too high due to the effect of forward osmosis, thereby causing the problem of too high TDS of the first cup of water when taking water next time, thereby improving the effect of the reflux bubble membrane.

[0044] Embodiment 2:

[0045] The difference between the embodiment of the present application and embodiment 1 is that the position of the solenoid valve in the water inlet circuit 1 is adjusted.

[0046] Reference Figure 2 A fifth solenoid valve 6 is arranged on the first water inlet passage 14, a second pressure reducing valve 122 is arranged on the first water inlet pipe 15, and a fourth solenoid valve 18 is arranged on the second water inlet pipe 16. When preparing pure water, the fifth solenoid valve 6, the fourth solenoid valve 18 and the boosting pump 13 are opened, and the second solenoid valve 21 is closed. The tap water enters the membrane filter element 3 through the first water inlet passage 14, the first water inlet pipe 15 and the second water inlet pipe 16 for filtration, thereby obtaining pure water; when the water purifier is turned on again after being on standby for a period of time, the fifth solenoid valve 6, the second pressure reducing valve 122, the boosting pump 13 and the second solenoid valve 21 are opened, and the fourth solenoid valve 18 is closed. The pure water in the outlet waterway 4 enters the inlet waterway 1 through the reflux water pipe 2, and is mixed with the tap water in the inlet waterway 1, thereby reducing the TDS value of the membrane filter element 3.

[0047] Embodiment 3:

[0048] The difference between the embodiment of the present application and embodiment 1 is that the water inlet waterway 1 is adjusted.

[0049] Reference Figure 3, the inlet water path 1 is provided with a sixth solenoid valve 7 and a concentrated water solenoid valve 121, and the concentrated water solenoid valve 121 is used to limit the flow of the inlet water path 1. When preparing pure water, the sixth solenoid valve 7, the concentrated water solenoid valve 121 and the booster pump 13 are opened, and the second solenoid valve 21 is closed, and the tap water enters the membrane filter element 3 through the inlet water path 1 for filtration, thereby producing pure water; when the water purifier is turned on again after being on standby for a period of time, the sixth solenoid valve 7, the second solenoid valve 21 and the booster pump 13 are opened, and the concentrated water solenoid valve 121 is closed. The concentrated water solenoid valve 121 limits the flow of tap water in the inlet water path 1, thereby reducing the TDS value after mixing with the inlet water path 1, reducing the TDS of the mixed water entering the booster pump 13, and allowing the mixed water with a lower TDS to enter the membrane filter element 3, thereby reducing the TDS of the first cup of water when the water purifier takes water next time.

[0050] The above disclosure is only a preferred embodiment of the present invention, and certainly cannot be used to limit the scope of rights of the present invention. Therefore, equivalent changes made according to the claims of the present invention are still within the scope covered by the present invention.

Claims

1. A water purifier with a reflux function, characterized in that: It comprises an inlet waterway (1) with a pressure reducing function, a return water pipe (2) and a membrane filter element (3), wherein the water outlet of the inlet waterway (1) is connected to the water inlet of the membrane filter element (3), the water inlet of the return water pipe (2) is connected to the water outlet of the membrane filter element (3), and the water outlet of the return water pipe (2) is connected to the inlet waterway (1); The return water pipe (2) is provided with a second solenoid valve (21) and a check valve (22), and the water inlet water circuit (1) is also provided with a booster pump (13), wherein the booster pump (13) is located between the check valve (22) and the membrane filter element (3).

2. A water purifier with reflux function as claimed in claim 1, characterized in that: The water inlet circuit (1) comprises a first water inlet passage (14), a first water inlet pipe (15) and a second water inlet pipe (16); the water inlet of the first water inlet pipe (15) and the water inlet of the second water inlet pipe (16) are both connected to the first water inlet passage (14); the water outlet of the first water inlet pipe (15) and the water outlet of the second water inlet pipe (16) are both connected to the water inlet of the membrane filter element (3).

3. A water purifier with reflux function as claimed in claim 2, characterized in that: The first water inlet pipe (15) is provided with a first solenoid valve (11) and a first pressure reducing valve (12), and the second water inlet pipe (16) is provided with a third solenoid valve (17).

4. A water purifier with reflux function as claimed in claim 3, characterized in that: The third solenoid valve (17) is used to control the on-off of the second water inlet pipe (16) when preparing pure water, the first solenoid valve (11) is used to control the on-off of the first water inlet pipe (15) when the return water pipe (2) is working, and the first pressure reducing valve (12) is used to control the water pressure of the first water inlet pipe (15) when water is entering.

5. A water purifier with reflux function as claimed in claim 2, characterized in that: The first water inlet passage (14) is provided with a fifth solenoid valve (6), the first water inlet pipe (15) is provided with a second pressure reducing valve (122), and the second water inlet pipe (16) is provided with a fourth solenoid valve (18).

6. A water purifier with reflux function as claimed in claim 5, characterized in that: The fifth solenoid valve (6) is used to control the on-off of the first water inlet passage (14), the fourth solenoid valve (18) is used to control the on-off of the second water inlet pipe (16) when preparing pure water, and the second pressure reducing valve (122) is used to control the water pressure when the first water inlet pipe (15) is inletting water.

7. A water purifier with reflux function as claimed in claim 1, characterized in that: The water inlet circuit (1) is provided with a sixth solenoid valve (7) and a concentrated water solenoid valve (121); the sixth solenoid valve (7) is used to control the on-off of the water inlet circuit (1), and the concentrated water solenoid valve (121) is used to limit the flow of the water inlet circuit (1).

8. A water purifier with reflux function as claimed in claim 1, characterized in that: The water purifier with a reflux function comprises a water outlet waterway (4), the water inlet of the water outlet waterway (4) being connected to the water outlet of the membrane filter element (3), and the water inlet of the reflux water pipe (2) being connected to the water outlet waterway (4).

9. A water purifier with reflux function as claimed in claim 1, characterized in that: The water purifier with a reflux function comprises a concentrated water circuit (5), and a water inlet of the concentrated water circuit (5) is connected to a concentrated water outlet of the membrane filter element (3).

Images