Control method of a water purification system

Abstract

The application discloses a control method of a water purification system and belongs to the technical field of water purification preparation devices. The control method of the water purification system is designed to solve the problem that the existing water purification system cannot continuously output bubble water. The control method of the water purification system disclosed by the application reduces the water pressure in the water inlet pipe downstream of a pressure reducing valve until the water pressure is lower than that in the backflow pipe, and an air inlet assembly is started for a second set time every first set time interval to fill the backflow pipe with air. The control method of the water purification system disclosed by the application can allow air to be filled into the water inlet pipe through the backflow pipe by reducing the water pressure in the water inlet pipe downstream of the pressure reducing valve, and water flow continuously enters the gas mixing tank, so that the bubble water supply is more continuous and stable, and the bubble water flow is large. The air discontinuously enters the backflow pipe, which is beneficial to improving the water-gas mixing quality in the gas mixing tank and improving the quality of the bubble water.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of water purification device, in particular to a control method of water purification system. BACKGROUND

[0002] Bubble water is composed of water and air, and the diameter of the bubbles in the water is usually between 1 micrometer and 100 micrometers. The bubble water processing system mainly includes four parts: a water inlet assembly, an air inlet assembly, a gas mixing tank and a bubbler. The water inlet assembly can send tap water into the gas mixing tank, and the air inlet assembly can send air into the gas mixing tank. After the air and water are mixed in the gas mixing tank, a gas-liquid mixture is formed. The gas-liquid mixture passes through the bubbler to obtain bubble water.

[0003] Some existing water purification systems have the functions of preparing purified water and bubble water, that is, the traditional water purification system and the bubble water processing system are integrated together. The water purification system usually includes a water inlet pipe, a bubble water outlet pipe, a purified water outlet pipe, a concentrated water pipe and a gas supplement assembly. The gas supplement assembly is located on the water inlet pipe, and a water inlet on-off valve is arranged on the water inlet pipe and located before the air inlet assembly.

[0004] When there is a continuous water flow in the water inlet pipe, it is difficult for the gas supplement assembly to charge air into the water inlet pipe. To solve this problem, the water purification system forms negative pressure before the booster pump by cutting off the water inlet on-off valve to realize air intake, and then opens the water inlet on-off valve to realize water intake, alternating in turn. Because air intake and water intake are separated in time, the gas mixing tank needs to wait for a period of time to obtain enough water and air for forming a mixture, and the bubbler also needs to wait for a period of time to obtain the water-air mixture to prepare bubble water, resulting in discontinuous bubble water outlet and poor user experience. SUMMARY

[0005] The purpose of the present application is to provide a control method of water purification system, which can supply bubble water stably.

[0006] To achieve this purpose, the present application adopts the following technical scheme:

[0007] The control method of a water purification system, the water purification system comprising: a water inlet pipe, a pressure reducing valve being arranged on the water inlet pipe, the pressure reducing valve being configured to reduce the water pressure in the water inlet pipe downstream of the pressure reducing valve; a bubble water pipe, a bubble water preparation device being arranged on the bubble water pipe, the bubble water pipe being connected to a water outlet of the water inlet pipe; a purified water pipe, a purified water filter being arranged on the purified water pipe, the purified water pipe being connected to the water outlet of the water inlet pipe; a concentrated water pipe, the concentrated water pipe being connected to a concentrated water outlet end of the purified water filter; a return pipe, one end of the return pipe being connected to the concentrated water pipe, the other end of the return pipe being connected to the water inlet pipe downstream of the pressure reducing valve; and an air inlet assembly, the air inlet assembly being connected to the return pipe; the control method comprising: the pressure reducing valve reducing the water pressure in the water inlet pipe downstream of the pressure reducing valve until the water pressure in the water inlet pipe is lower than the water pressure in the return pipe, and the air inlet assembly being activated for a second set time every first set time.

[0008] In one preferred embodiment, during the air inlet assembly being closed, the concentrated water in the concentrated water pipe flows into the return pipe.

[0009] In one preferred embodiment, the ratio of the length of the first set time to the length of the second set time is in the range of 2.5:1 to 3.5:1.

[0010] In one preferred embodiment, the air inlet assembly comprises a first one-way valve and an air pump, the first one-way valve being connected to the connection intersection of the concentrated water pipe and the return pipe.

[0011] In one preferred embodiment, the return pipe is provided with a return on-off valve and a second one-way valve, and the concentrated water pipe is provided with a concentrated water control valve and a concentrated water on-off valve in sequence along the water flow direction.

[0012] In one preferred embodiment, the purified water pipe is further provided with a purified water on-off valve, the purified water on-off valve being located upstream of the purified water filter.

[0013] In one preferred embodiment, the water inlet pipe is further provided with a booster pump, the booster pump being located downstream of the pressure reducing valve, and the return pipe being connected to the water inlet pipe between the pressure reducing valve and the booster pump.

[0014] In one preferred embodiment, the air or air-water mixture in the return pipe mixes with the water in the water inlet pipe and then enters the purified water pipe to flush the purified water filter.

[0015] In one preferred embodiment, the booster pump, the air pump, the purified water on-off valve, the concentrated water control valve and the return on-off valve are opened, and the concentrated water on-off valve is closed.

[0016] In one preferred embodiment, the concentrated water valve is opened after the flushing set time, and the flushing material in the purified water filter core is discharged through the concentrated water pipe.

[0017] In one preferred embodiment, when the purified water is prepared by using the ordinary water preparation mode, the booster pump, the purified water valve and the concentrated water valve are opened, and the air pump, the concentrated water control valve and the backflow valve are closed, and the concentrated water prepared by the purified water filter core is discharged through the concentrated water valve.

[0018] In one preferred embodiment, when the purified water is prepared by using the backflow water preparation mode, the booster pump, the purified water valve and the backflow valve are opened, and the air pump, the concentrated water control valve and the concentrated water valve are closed, and the concentrated water prepared by the purified water filter core is discharged through the backflow valve and flows back to the water inlet pipe.

[0019] In one preferred embodiment, the control method is to alternately use the ordinary water preparation mode and the backflow water preparation mode.

[0020] In one preferred embodiment, the sparkling water pipe is further provided with a sparkling water switch, and the sparkling water switch at least includes a high-flow gear; when the sparkling water switch is in the high-flow gear, the booster pump, the air pump and the backflow valve are opened, and the purified water valve, the concentrated water control valve and the concentrated water valve are closed, the air pump sends air into the backflow pipe, the air mixes with the concentrated water in the concentrated water pipe to form a preliminary mixture, the preliminary mixture mixes with the water in the water inlet pipe to form a water-air mixture, and the water-air mixture is all sent into the gas mixing tank.

[0021] In one preferred embodiment, the sparkling water switch further includes a low-flow gear; when the sparkling water switch is in the low-flow gear, the booster pump, the air pump, the purified water valve and the backflow valve are opened, and the concentrated water control valve and the concentrated water valve are closed, part of the water-air mixture is sent into the gas mixing tank, and the other part is sent into the purified water pipe.

[0022] In one preferred embodiment, when the sparkling water is prepared, the volume ratio of water to air is within a set range.

[0023] In one preferred embodiment, the load pressure p of the air pump is equal to the back pressure p1 of the pressure reducing valve + the opening pressure p2 of the first one-way valve + the opening pressure p3 of the second one-way valve + the opening pressure p4 of the backflow valve.

[0024] In one preferred embodiment, the first check valve and the second check valve have an opening pressure range of (0.29-0.73) psi, the backflow shutoff valve has an opening pressure range of (0.15-0.29) psi, and / or the pressure relief valve has a post-pressure pi in the range of (5.27-11.05) psi.

[0025] The control method of the water purifying system disclosed in the present application does not need to cut off the water flow in the water inlet pipe when air is filled, and the air can be allowed to fill into the water inlet pipe through the backflow pipe by reducing the water pressure in the water inlet pipe downstream of the pressure relief valve, so that the water flow continuously enters the mixing tank, the bubble water supply is more continuous and stable, and the bubble water flow is large. The air enters the backflow pipe intermittently, realizing the preliminary mixing of air and concentrated water, which is beneficial to improving the water-air mixing quality in the mixing tank and improving the quality of the bubble water. The bubble water outflow is stable. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 is a structural schematic diagram of the water purifying system provided by the embodiment of the present application;

[0027] Figure 2 is a pressure-flow curve diagram of the air pump provided by the embodiment of the present application. DETAILED DESCRIPTION

[0028] In order to make the above-mentioned objects, features and advantages of the present application more apparent and easy to understand, the specific embodiments of the present application will be described in detail below with reference to the accompanying drawings. In the following description, a large number of specific details are set forth in order to fully understand the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the scope of the present application, so the present application is not limited to the specific embodiments disclosed below.

[0029] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0030] In addition, the terms "first", "second", "third", etc. are used herein only to describe different instances, and are not used to denote or imply relative importance or a number of indications of the technical features indicated. Thus, the technical features defined with "first", "second", etc. can explicitly or implicitly include at least one of the technical features. In the description of the present application, the meaning of "a plurality of" is at least two, for example, two, three, etc., unless otherwise explicitly specified and limited.

[0031] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrated; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through intermediate medium, or it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0032] In the present application, unless otherwise explicitly specified and limited, the first feature is "on" or "under" the second feature, which can be direct contact between the first and second features, or indirect contact between the first and second features through intermediate medium. Moreover, the first feature "above", "over" and "on" the second feature can be directly above or obliquely above the first feature, or only indicate that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "under" and "under" the second feature can be directly below or obliquely below the first feature, or only indicate that the horizontal height of the first feature is less than that of the second feature.

[0033] It should be noted that when an element is referred to as "fixed to" or "provided on" another element, it can be directly on another element or there can be a middle element. When an element is considered to be "connected" to another element, it can be directly connected to another element or there can be a middle element. The terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used herein are only for illustrative purposes and are not the only embodiment.

[0034] The control method of the water purification system disclosed in the embodiment is based on the water purification system as shown in Figure 1 The water purification system includes a water inlet pipe, a bubble water pipe, a purified water pipe, a concentrated water pipe, a backflow pipe and an air inlet assembly. The inlet of the water inlet pipe is connected to a raw water source. A pressure reducing valve and a booster pump are arranged on the water inlet pipe in sequence along the water flow direction. The pressure reducing valve can reduce the water pressure in the downstream water inlet pipe to allow air to enter the water purification system. The booster pump can increase the negative pressure in the upstream water inlet pipe.

[0035] The head end of the bubbled water pipe is connected to the water outlet of the water inlet pipe, and a bubbled water faucet is arranged at the tail end of the bubbled water pipe to supply bubbled water to the user; a gas mixing tank and a bubbler are arranged on the bubbled water pipe, the gas mixing tank is used to mix water and air uniformly, and the bubbler is used to generate bubbled water.

[0036] The head end of the purified water pipe is connected to the water outlet of the water inlet pipe, and a purified water faucet is arranged at the tail end to supply purified water to the user; a purified water on-off valve and a purified water filter core are arranged on the purified water pipe in sequence along the water flow direction, the purified water on-off valve is used to control the on-off of the purified water pipe, and the purified water filter core is preferably an RO membrane filter core, which is mature and has good water purification effect.

[0037] The concentrated water pipe is connected to the concentrated water outlet end of the purified water filter core to discharge the concentrated water generated by the purified water filter core. The concentrated water pipe is sequentially provided with a concentrated water control valve and a concentrated water on-off valve along the water flow direction, the concentrated water control valve is used to control the size of the concentrated water flow, and the concentrated water on-off valve is used to control the on-off of the concentrated water pipe.

[0038] One end of the backflow pipe is connected to the concentrated water pipe and the connection point is between the concentrated water control valve and the concentrated water on-off valve, and the other end of the backflow pipe is connected to the water inlet pipe and located between the pressure reducing valve and the booster pump. The backflow pipe is provided with a backflow on-off valve and a second one-way valve, the backflow on-off valve is used to control the on-off of the backflow pipe, and the second one-way valve is used to prevent the water in the backflow pipe from flowing backward. The backflow on-off valve can prevent the booster pump from sucking the concentrated water into the water inlet pipe when the water inlet pipe is blocked or the water inlet pressure is too low, thereby playing a protection role. If the water inlet pipe is not blocked or the water inlet pressure is not too low, the backflow on-off valve can be omitted.

[0039] The air inlet assembly is connected to the backflow pipe to fill air into the backflow pipe. The air inlet assembly can include but is not limited to a first one-way valve and an air pump, and the first one-way valve is preferably connected to the connection intersection of the concentrated water pipe and the backflow pipe, that is, the air inlet assembly is equivalent to being connected to the backflow pipe and the concentrated water pipe at the same time.

[0040] The control method is that the pressure reducing valve reduces the water pressure in the water inlet pipe downstream thereof until it is lower than the water pressure in the backflow pipe, and the air inlet assembly is started for a second set time every first set time interval to fill air into the backflow pipe. Preferably, during the closing of the air inlet assembly, the concentrated water in the concentrated water pipe flows into the backflow pipe.

[0041] The water purification system can prepare purified water and bubble water, and can meet various water demands of users, and has wide application range. When air is filled, the water flow in the water inlet pipe does not need to be cut off, and the air can be filled into the water inlet pipe through the backflow pipe by using the pressure reducing valve to reduce the water pressure in the water inlet pipe downstream, so that the water flow continuously enters the gas mixing tank, the bubble water supply is more continuous and stable, and the bubble water flow is large. The air enters the backflow pipe intermittently, that is, the air and the concentrated water alternately enter the backflow pipe, so that the preliminary mixing of the air and the concentrated water is realized, which is beneficial to improving the water-air mixing quality in the gas mixing tank and improving the quality of the bubble water (the number and diameter of the dissolved bubbles in the water are better, and other parameters are better), and the bubble water outflow is stable.

[0042] In order to achieve better bubble water effect, the volume ratio a of water and air needs to be in a suitable range (10≤a≤200, preferably 18≤a≤100). Assuming that the load pressure of the air pump is p, the back pressure of the pressure reducing valve is p1, the opening pressure of the first one-way valve is p2, the opening pressure of the second one-way valve is p3, and the opening pressure of the backflow on-off valve is p4, the relationship is: the load pressure of the air pump p = the back pressure of the pressure reducing valve p1 + the opening pressure of the first one-way valve p2 + the opening pressure of the second one-way valve p3 + the opening pressure of the backflow on-off valve p4.

[0043] By selecting suitable types of the pressure reducing valve, the first one-way valve, the second one-way valve and the backflow on-off valve, the load pressure of the air pump can be controlled in a certain range, so as to ensure that the volume ratio a of water and air is in the required range. For example, the micro-bubble water flow is stabilized at (2.8-3.4) L / min, and if 18≤a≤100, the air inlet flow needs to be controlled at (34-156) mL / min. The air inlet flow range is too narrow, and the air pump load pressure is difficult to control. The intermittent air inlet is adopted to expand the air inlet flow range, and then the air pump load pressure range is expanded.

[0044] Figure 2 The pressure-flow curve of a certain air pump is shown. The pressure-flow of other air pumps has slight differences in specific values, but the curve trend is basically the same, which can be taken as an example to explain all air pumps.

[0045] Considering the upper and lower limits of the air pump, the air pump pumping pressure values corresponding to different on-off time ratios are shown in the following table.

[0046]

[0047] The air pump load pressure range is too narrow (Δp is too small), which is difficult to control; and the load pressure is too low, which will cause the pre-pump pressure to be too low, affecting the bubble water flow and the purified water flow. Considering the above two factors, the length ratio of the first set time to the second set time is preferably in the interval of 2.5:1 to 3.5:1, and more preferably 3:1. That is, the air pump on-off time ratio is preferably 1:3.

[0048] The first check valve and the backflow valve are selected from a type with a lower opening pressure, such as the first check valve and the second check valve with an opening pressure range of (0.29-0.73) psi, and the backflow valve with an opening pressure range of (0.15-0.29) psi. The pressure reducing valve is selected according to the formula p = p1 + p2 + p3 + p4, and the back pressure p1 of the pressure reducing valve is in the range of (5.27-11.05) psi.

[0049] On the basis of the above structure, the water purification system further comprises a control device, and each valve and device that needs to be opened and closed according to the use requirement is connected to the control device, and the opening and closing of each valve and device is controlled by the control device, so that the whole machine can work coordinately and is more convenient to use.

[0050] In a high-hardness or high-gel water area, contaminants are easily accumulated on the membrane surface of the water purification filter core when the water purification filter core is used to prepare purified water. In order to solve this problem, the control device opens the booster pump, the air pump, the purified water valve, the concentrated water control valve and the backflow valve, and closes the concentrated water valve. The water-gas mixture in the backflow pipe is mixed with the water in the water inlet pipe and then enters the purified water pipe to circulate and flush the water purification filter core, so that the contaminants on the membrane surface of the water purification filter core can be flushed away, the service life of the water purification filter core is prolonged, and the water purification effect is better. After the flushing time is set, the concentrated water valve is opened, and the flushing material in the water purification filter core is discharged through the concentrated water pipe.

[0051] Because the backflow pipe is connected between the concentrated water pipe and the water inlet pipe, the water purification system includes a normal water preparation mode and a backflow water preparation mode when the purified water is prepared, and the recovery rate can be adjusted by controlling the different time ratios of the two water preparation modes. Specifically, when the normal water preparation mode is adopted, the control device opens the booster pump, the purified water valve and the concentrated water valve, and closes the air pump, the concentrated water control valve and the backflow valve. The raw water enters the purified water pipe after passing through the booster pump, the purified water prepared by the water purification filter core is supplied to the user through the purified water faucet, and the concentrated water prepared by the water purification filter core is discharged through the concentrated water control valve and the concentrated water valve. The normal water preparation mode is also called a low recovery rate mode, and the recovery rate is k0.

[0052] When the backflow water preparation mode is adopted, the control device opens the booster pump, the purified water valve and the backflow valve, and closes the air pump, the concentrated water control valve and the concentrated water valve. The raw water enters the purified water pipe after passing through the booster pump, the purified water prepared by the water purification filter core is supplied to the user through the purified water faucet, and the concentrated water prepared by the water purification filter core flows back to the water inlet pipe through the backflow valve. At this time, no concentrated water is discharged, so the backflow water preparation mode is also called a 100% recovery rate mode.

[0053] Whether the normal water preparation mode or the backflow water preparation mode is selected can be determined according to the water quality of the tap water, and the normal water preparation mode and the backflow water preparation mode can also be alternately adopted. By controlling the different time ratios of the normal water preparation mode and the backflow water preparation mode, the overall recovery rate can be adjusted between k0 and 100%.

[0054] On the basis of the above structure, the bubble water pipe is further provided with a bubble water switch for detecting whether the user takes the bubble water. The specific structure of the bubble water switch is not limited, and any device capable of detecting whether water flows out of the pipe in the prior art can be used. Preferably, the bubble water switch at least includes a high-flow position and a low-flow position.

[0055] When the bubble water switch is in the high-flow position, the control device opens the booster pump, the air pump and the backflow on-off valve, and closes the clean water on-off valve, the concentrated water control valve and the concentrated water on-off valve. The tap water enters the booster pump after being reduced in pressure by the pressure reducing valve, the air pump sends air into the backflow pipe through the first one-way valve, and the air mixes with the concentrated water in the concentrated water pipe to form a preliminary mixture. The preliminary mixture enters the water inlet pipe after passing through the backflow on-off valve and the second one-way valve, and the water in the water inlet pipe mixes with the preliminary mixture to form a water-air mixture, which then enters the booster pump. After passing through the booster pump, the water-air mixture is all sent into the gas mixing tank, where it is uniformly mixed and generates bubble water after releasing pressure by the bubbler.

[0056] When the bubble water switch is in the low-flow position, the control device opens the booster pump, the air pump, the clean water on-off valve and the backflow on-off valve, and closes the concentrated water control valve and the concentrated water on-off valve. The tap water enters the booster pump after being reduced in pressure by the pressure reducing valve, the air pump sends air into the backflow pipe through the first one-way valve, and the air mixes with the concentrated water in the concentrated water pipe to form a preliminary mixture. The preliminary mixture enters the water inlet pipe after passing through the backflow on-off valve and the second one-way valve, and the water in the water inlet pipe mixes with the preliminary mixture to form a water-air mixture, which then enters the booster pump. Part of the water-air mixture is sent into the gas mixing tank for uniform mixing and generates bubble water after releasing pressure by the bubbler; the other part of the water-air mixture is sent into the clean water pipe, passes through the clean water on-off valve and the clean water filter element, and then reenters the backflow pipe.

[0057] On the basis of the above structure, the clean water system further includes a PCB composite filter element, which includes a pretreatment filter element and a post-treatment filter element that are independent of each other in the water path. The pretreatment filter element is arranged on the water inlet pipe and used for rough filtration of tap water; the post-treatment filter element is arranged on the clean water pipe and located downstream of the clean water filter element, and used for adsorbing foreign color and odor substances and improving taste.

[0058] Note that the above merely describes the preferred embodiments of the present application and the technical principles used. Those skilled in the art will understand that the present application is not limited to the specific embodiments described herein, and those skilled in the art can make various obvious changes, readjustments and substitutions without departing from the scope of the present application. Therefore, although the present application has been described in detail through the above embodiments, the present application is not limited to the above embodiments, and can include more other equivalent embodiments without departing from the concept of the present application, and the scope of the present application is determined by the scope of the appended claims.

Claims

1. A control method for a water purification system, characterized in that, The water purification system includes: A water inlet pipe is provided with a pressure reducing valve, which is configured to reduce the water pressure in the downstream water inlet pipe. A bubble water pipe, on which a bubble water preparation device is installed, the bubble water pipe being connected to the outlet of the inlet pipe; A water purification pipe, on which a water purification filter element is installed, is connected to the outlet of the water inlet pipe; A concentrated water pipe is connected to the concentrated water outlet end of the water purification filter element; A return pipe, one end connected to the concentrate pipe and the other end connected to the inlet pipe and located downstream of the pressure reducing valve; and, An air intake assembly is connected to the return pipe; the air intake assembly includes a first one-way valve and an air pump, the first one-way valve being connected at the junction of the concentrated water pipe and the return pipe; The control method is as follows: air mixes with concentrated water in the concentrated water pipe to form a preliminary mixture, and the preliminary mixture mixes with water in the inlet pipe to form a water-air mixture; the pressure reducing valve reduces the water pressure in the downstream inlet pipe until it is lower than the water pressure in the return pipe; the air intake component is continuously activated for a second set time at a first set time interval to fill the return pipe with air; during the period when the air intake component is closed, the concentrated water in the concentrated water pipe flows into the return pipe.

2. The control method for the water purification system according to claim 1, characterized in that, The ratio of the duration of the first set time to the duration of the second set time is in the range of 2.5:1 to 3.5:

1.

3. The control method for the water purification system according to claim 1, characterized in that, The return pipe is equipped with a return shut-off valve and a second check valve, and the concentrate pipe is equipped with a concentrate control valve and a concentrate on / off valve in sequence along the water flow direction.

4. The control method for the water purification system according to claim 3, characterized in that, The water purification pipe is also equipped with a water purification on / off valve, which is located upstream of the water purification filter element.

5. The control method for the water purification system according to claim 4, characterized in that, A booster pump is also installed on the water inlet pipe. The booster pump is located downstream of the pressure reducing valve. The return pipe is connected to the water inlet pipe between the pressure reducing valve and the booster pump.

6. The control method for the water purification system according to claim 5, characterized in that, The initial mixture in the return pipe mixes with the water in the inlet pipe and then enters the purified water pipe to rinse the purified water filter element.

7. The control method for the water purification system according to claim 6, characterized in that, Turn on the booster pump, the air pump, the purified water on / off valve, the concentrated water control valve, and the return flow shut-off valve, and close the concentrated water on / off valve.

8. The control method for the water purification system according to claim 7, characterized in that, After the set flushing time, the concentrated water on / off valve is opened, and the flushing material in the purified water filter element is discharged through the concentrated water pipe.

9. The control method for the water purification system according to claim 5, characterized in that, The bubble water pipe is also equipped with a bubble water switch, which includes at least a high flow rate setting. When the bubble water switch is in the high flow rate setting, the booster pump, the air pump, and the return flow shut-off valve are turned on, while the purified water shut-off valve, the concentrate control valve, and the concentrate shut-off valve are turned off. The air pump sends air into the return pipe, and the water-air mixture is completely sent into the mixing tank.

10. The control method for the water purification system according to claim 9, characterized in that, The bubble water switch also includes a low flow rate setting; when the bubble water switch is in the low flow rate setting, the booster pump, the air pump, the purified water on / off valve, and the return flow off valve are turned on, and the concentrate control valve and the concentrate on / off valve are turned off. A portion of the water-air mixture is sent into the mixing tank, and another portion is sent into the purified water pipe.

11. The control method for the water purification system according to claim 5, characterized in that, When preparing sparkling water, the volume ratio of water to air is within a set range.

12. The control method for the water purification system according to claim 11, characterized in that, The load pressure p of the air pump = the back pressure p1 of the pressure reducing valve + the opening pressure p2 of the first one-way valve + the opening pressure p3 of the second one-way valve + the opening pressure p4 of the return flow cut-off valve.

13. The control method for the water purification system according to claim 12, characterized in that, The opening pressure range of the first check valve and the second check valve is 0.29 psi to 0.73 psi, the opening pressure range of the reflux shut-off valve is 0.15 psi to 0.29 psi, and / or the downstream pressure p1 of the pressure reducing valve is 5.27 psi to 11.05 psi.

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