A reverse osmosis water purification system and a control method thereof

Abstract

The application discloses a reverse osmosis water purification system and a control method thereof. The reverse osmosis water purification system comprises a reverse osmosis filter element and a booster pump, and a double-cavity water storage device. The double-cavity water storage device is provided with a first pure water pre-storage cavity and a second pure water pre-storage cavity, and the first pure water pre-storage cavity and the second pure water pre-storage cavity can interact to realize synchronous volume change. The pure water outlet of the reverse osmosis filter element can be in communication with the first pure water pre-storage cavity and the second pure water pre-storage cavity to have a first water supply state and a second water supply state. In the first water supply state, the volume of the first pure water pre-storage cavity increases while the volume of the second pure water pre-storage cavity decreases. In the second water supply state, the volume of the second pure water pre-storage cavity increases while the volume of the first pure water pre-storage cavity decreases. Through switching of the reverse osmosis filter element between the first water supply state and the second water supply state, the application ensures that the pure water taken by a user is always in a directly drinkable state with a low TDS value, and the use experience of the user is improved.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of water purification equipment, and particularly relates to a reverse osmosis water purification system and a control method thereof. BACKGROUND

[0002] With the improvement of people's requirements for drinking water quality, water purifiers are gradually entering the drinking water system of every household. The water purifiers on the market generally use reverse osmosis filter cartridges, which are called reverse osmosis water purifiers. The reverse osmosis filter cartridges can filter impurities such as organic matter, colloids, bacteria, viruses and the like in raw water, and have a very high filtration efficiency for impurities such as inorganic salts and heavy metal ions. Therefore, the reverse osmosis filter cartridges constitute the core components of the water purifier, and the filtration effect and flux of the water purifier are directly related to the structure of the reverse osmosis filter cartridge assembly.

[0003] The reverse osmosis filter cartridge generally comprises a center tube and a reverse osmosis membrane element wrapped outside the center tube. When the reverse osmosis water purifier is at rest, the water molecules, inorganic salts, heavy metal ions and the like on both sides of the reverse osmosis membrane element realize material exchange under the action of diffusion phenomenon, and the macroscopic performance is that the TDS concentrations on both sides of the reverse osmosis membrane element gradually tend to be the same. Therefore, when the reverse osmosis water purifier is used again after being at rest for a period of time, the TDS of the water flow in the initial stage of the outflow will be high, which makes the TDS of the first few cups of water high, and it is not suitable for direct drinking, which gives the user a poor use experience. The existing reverse osmosis water purifiers mostly use flushing or pure water backflow to solve the problem of high TDS after standby, and this technology has the problem of large amount of waste water. Even if the water taking amount is very small, a lot of waste water will also be produced, and water resources are seriously wasted. SUMMARY

[0004] The present application provides a reverse osmosis water purification system and a control method thereof to solve the technical problem that the TDS of the water flow in the initial stage of the outflow will be high when the reverse osmosis water purifier is used again after being at rest for a period of time.

[0005] The technical solution adopted by the present application is as follows:

[0006] The reverse osmosis water purification system comprises: a reverse osmosis filter element and a booster pump connected to a raw water inlet of the reverse osmosis filter element; a double-cavity water storage device provided with a first pure water pre-storage cavity and a second pure water pre-storage cavity, the first pure water pre-storage cavity and the second pure water pre-storage cavity can interact to realize volume synchronous change; the pure water outlet of the reverse osmosis filter element can be communicated with the first pure water pre-storage cavity and the second pure water pre-storage cavity to have a first water supply state and a second water supply state, wherein: in the first water supply state, the reverse osmosis filter element supplies water to the first pure water pre-storage cavity to increase the volume of the first pure water pre-storage cavity while the volume of the second pure water pre-storage cavity is reduced; in the second water supply state, the reverse osmosis filter element supplies water to the second pure water pre-storage cavity to increase the volume of the second pure water pre-storage cavity while the volume of the first pure water pre-storage cavity is reduced.

[0007] The reverse osmosis water purification system in the application further comprises the following technical features:

[0008] The first pure water pre-storage cavity and the second pure water pre-storage cavity are separated by a partition; in the first water supply state, at least part of the partition is deformed towards the second pure water pre-storage cavity to increase the volume of the first pure water pre-storage cavity while the volume of the second pure water pre-storage cavity is reduced; in the second water supply state, at least part of the partition is deformed towards the first pure water pre-storage cavity to increase the volume of the second pure water pre-storage cavity while the volume of the first pure water pre-storage cavity is reduced.

[0009] The partition is movably arranged in the double-cavity water storage device; in the first water supply state, the partition moves towards the second pure water pre-storage cavity to increase the volume of the first pure water pre-storage cavity while the volume of the second pure water pre-storage cavity is reduced; in the second water supply state, the partition moves towards the first pure water pre-storage cavity to increase the volume of the second pure water pre-storage cavity while the volume of the first pure water pre-storage cavity is reduced.

[0010] Further comprising a first three-way valve, a second three-way valve and a third three-way valve; the pure water outlet of the reverse osmosis filter element, the pure water inlet and outlet of the second pure water pre-storage cavity and the faucet of the reverse osmosis water purification system are communicated with a first valve port, a second valve port and a third valve port of the first three-way valve respectively; the pure water outlet of the reverse osmosis filter element and the high-concentration water inlet and outlet of the first pure water pre-storage cavity are communicated with a first valve port and a second valve port of the second three-way valve respectively, a third valve port of the second three-way valve is communicated with a first valve port of the third three-way valve, and a second valve port and a third valve port of the third three-way valve are communicated with an inlet of the booster pump and a wastewater discharge port of the reverse osmosis water purification system respectively.

[0011] The raw water inlet of the reverse osmosis filter element is provided with a first TDS detection member for detecting the TDS value of raw water; and / or, the pure water outlet of the reverse osmosis filter element is provided with a second TDS detection member for detecting the TDS value of pure water.

[0012] The control method of the reverse osmosis water purification system provided by the application is applied to the reverse osmosis water purification system described above, and comprises the following steps:

[0013] S1: receiving a water taking instruction, and controlling the reverse osmosis water purification system to switch from a standby state to a first water supply state;

[0014] S2: judging whether the TDS value of pure water at the pure water outlet of the reverse osmosis filter element reaches a preset removal rate, and if yes, terminating the first water supply state and delivering the produced water to a faucet, otherwise, delivering the water produced in the first water supply state into a first pure water pre-storage cavity, so as to deliver the water in the second pure water pre-storage cavity to the faucet;

[0015] S3: when the faucet is closed, controlling the reverse osmosis water purification system to switch to a second water supply state, so that the pure water produced in the second water supply state enters the second pure water pre-storage cavity, and the water in the first pure water pre-storage cavity is discharged to a booster pump and then returns to the reverse osmosis filter element or is discharged to a waste water discharge port of the system;

[0016] S4: after the second water supply state ends, controlling the reverse osmosis water purification system to switch to the standby state.

[0017] Preferably, when the reverse osmosis water purification system is powered on for the first time, the following steps are included:

[0018] S11: controlling the reverse osmosis water purification system to switch from the standby state to the first water supply state, so that the pure water produced in the first water supply state enters the first pure water pre-storage cavity, and the air in the first pure water pre-storage cavity and the second pure water pre-storage cavity is discharged;

[0019] S12: after the reverse osmosis water purification system is in the first water supply state for a first time length, terminating the first water supply state and delivering the produced water to the faucet or switching to the second water supply state so that the pure water produced in the second water supply state enters the second pure water pre-storage cavity.

[0020] Preferably, the judgment condition that the water in the first pure water pre-storage cavity is discharged to the booster pump and then returns to the reverse osmosis filter element or is discharged to the waste water discharge port of the system in step S3 comprises:

[0021] The TDS value of the raw water filtered by the reverse osmosis filter core in the first water supply state in the judging step S2 is compared with the first threshold value; when the TDS value of the raw water is less than the first threshold value, the water in the first pure water pre-storage cavity is discharged to the booster pump or the waste water discharge port of the system; when the TDS value of the raw water is greater than the first threshold value, the water in the first pure water pre-storage cavity is discharged to the waste water discharge port of the system.

[0022] Preferably, the judgment condition of discharging the water in the first pure water pre-storage cavity to the booster pump and backflowing to the reverse osmosis filter core or discharging to the waste water discharge port of the system in the step S3 further comprises:

[0023] When the TDS value of the raw water is less than the first threshold value, the standby time length of the reverse osmosis water purification system before receiving the water taking instruction in the step S1 is judged; when the standby time length of the reverse osmosis water purification system is less than the first preset time length, the water in the first pure water pre-storage cavity is completely discharged to the booster pump; when the standby time length of the reverse osmosis water purification system is greater than the first preset time length and less than the second preset time length, the water in the first pure water pre-storage cavity is first discharged to the booster pump and then discharged to the waste water discharge port of the system after the third preset time length.

[0024] Preferably, when the standby time length of the reverse osmosis water purification system is greater than the fourth preset time length and no water taking instruction is received, the reverse osmosis water purification system is controlled to switch from the standby state to the cleaning state, and the pure water produced in the cleaning state is discharged to the waste water discharge port of the system.

[0025] Thanks to the above technical scheme, the present application has the following beneficial effects:

[0026] 1.The reverse osmosis water purification system provided by the present application, wherein a double-cavity water storage device is provided with a first pure water pre-storage cavity and a second pure water pre-storage cavity, and a pure water outlet of a reverse osmosis filter core can be in communication with the first pure water pre-storage cavity and the second pure water pre-storage cavity alternatively to have a first water supply state and a second water supply state; when the system is standby for a period of time and then water is taken again, the reverse osmosis filter core is in the first water supply state because the TDS value of the pure water filtered by the reverse osmosis filter core in the early stage is relatively high, the water with a relatively high TDS value filtered by the reverse osmosis filter core in the early stage is delivered to the first pure water pre-storage cavity for pre-storage, the volume of the first pure water pre-storage cavity is increased, the volume of the second pure water pre-storage cavity is reduced, and the water with a relatively low TDS value pre-stored in the second pure water pre-storage cavity is delivered to a faucet water end; when the reverse osmosis filter core works for a period of time and the TDS value of the water produced reaches a relevant requirement, the first water supply state can be terminated, and the water filtered by the reverse osmosis filter core is directly delivered to the faucet water end; after the user finishes taking water, the reverse osmosis filter core can be switched to the second water supply state, the pure water filtered by the reverse osmosis filter core and suitable for drinking is delivered to the second pure water pre-storage cavity for pre-storage, the volume of the second pure water pre-storage cavity is increased, the volume of the first pure water pre-storage cavity is reduced, and the water with a relatively high TDS value pre-stored in the first pure water pre-storage cavity is discharged. Therefore, in the present application, through the switching of the reverse osmosis filter core between the first water supply state and the second water supply state, the pre-storage of the water with a high TDS value in the first pure water pre-storage cavity, the pre-storage of the water with a low TDS value in the second pure water pre-storage cavity, and the volume change caused by the interaction of the first pure water pre-storage cavity and the second pure water pre-storage cavity, it is ensured that the pure water taken by the user always remains in a state of being directly drinkable with a relatively low TDS value, the health of the user when drinking water is ensured, and the user experience is improved. Compared with the flushing of the reverse osmosis membrane or the pure water backflow in the prior art, the present application only needs to store a small amount of water with a relatively high TDS value filtered by the reverse osmosis filter core in the early stage into the first pure water pre-storage cavity and discharge it, and the amount of waste water produced is smaller, which helps to save water resources and reduce the working energy consumption of the whole machine. In addition, the first pure water pre-storage cavity and the second pure water pre-storage cavity interact to realize a working state in which one side takes in water and the other side discharges water, so that the double-cavity water storage device is a pure mechanical structure without electricity, the complexity of the structure of the double-cavity water storage device is reduced, the structure is simplified, and the structure cost and control cost are reduced.

[0027] 2.As a preferred mode of the present application, the first pure water pre-storage cavity and the second pure water pre-storage cavity are separated by a deformable partition, and the first pure water pre-storage cavity or the second pure water pre-storage cavity can be extruded by deforming the partition under the action of water pressure to realize water outlet, which is simple in structure, easy to realize, and low in cost.

[0028] 3. As a preferred mode of the present application, the partition is movably arranged in the double-cavity water storage device, and the movement of the partition is matched with the deformation of the partition itself, so as to maximize the ability of the partition to empty the first and second pure water pre-storage cavities and maximize the water storage of the first or second pure water pre-storage cavity, thereby improving the space utilization.

[0029] 4. As a preferred mode of the present application, the first three-way valve realizes the water path connection among the pure water outlet of the reverse osmosis filter core, the pure water inlet and outlet of the second pure water pre-storage cavity, and the faucet of the reverse osmosis water purification system, the second three-way valve realizes the connection among the pure water outlet of the reverse osmosis filter core, the high-concentration water inlet and outlet of the first pure water pre-storage cavity, and the third three-way valve, the third three-way valve realizes the connection among the second three-way valve, the inlet of the booster pump, and the waste water discharge port of the reverse osmosis water purification system, and the water path is adjusted by opening and closing of each valve port of the first three-way valve, the second three-way valve, and the third three-way valve, thereby facilitating the operation.

[0030] 5. As a preferred mode of the present application, the first TDS detection member is arranged to monitor the TDS value of the raw water delivered to the reverse osmosis filter core in real time, and the second TDS detection member is arranged to monitor the TDS value of the pure water filtered out by the reverse osmosis filter core in real time, so as to facilitate the switching of the reverse osmosis filter core among the first water supply state, the second water supply state, and the direct water supply to the water faucet water end. BRIEF DESCRIPTION OF DRAWINGS

[0031] The accompanying drawings, which are included to provide a further understanding of the present application, form a part of the present application and illustrate the illustrative embodiments of the present application and together with the description serve to explain the present application. In the drawings:

[0032] Figure 1 The structural principle diagram of the reverse osmosis water purification system provided by the embodiments of the present application.

[0033] Among them:

[0034] 1. Reverse osmosis filter core;

[0035] 2. Double-cavity water storage device, 21 first pure water pre-storage cavity, 22 second pure water pre-storage cavity;

[0036] 3. Partition;

[0037] 4. First three-way valve;

[0038] 5. High-voltage switch;

[0039] 6. First one-way valve;

[0040] 7. Second three-way valve;

[0041] 8 first TDS detection member;

[0042] 9 second TDS detection member;

[0043] 10 pure water outlet;

[0044] 11 pure water inlet and outlet;

[0045] 12 faucet;

[0046] 13 high-concentration water inlet and outlet;

[0047] 14 waste water discharge port;

[0048] 15 waste water discharge valve;

[0049] 16 booster pump;

[0050] 17 third three-way valve;

[0051] 18 second one-way valve. DETAILED DESCRIPTION

[0052] In order to more clearly illustrate the overall concept of the present application, the following will be described in detail with reference to the accompanying drawings.

[0053] In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. However, it will be apparent to one skilled in the art that the present application can be practiced without the specific details set forth in this description. In other instances, well-known methods, procedures, components, and circuits have not been described in detail as not to unnecessarily obscure aspects of the present application. It should be understood that the embodiments of the present application and the features thereof can be combined with each other unless otherwise explicitly stated.

[0054] In addition, in the description of the present application, it should be understood that the terms "top", "bottom", "inner", "outer", 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 convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element 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.

[0055] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected, or it can be communicated; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above-mentioned terms in the present application can be understood according to the specific circumstances.

[0056] In the present application, unless otherwise explicitly specified and limited, the first feature is "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. In the description of the present specification, the description referring to the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" and the like 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 the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples.

[0057] As Figure 1 As shown in the figure, a reverse osmosis water purification system comprises: a reverse osmosis filter element 1 and a booster pump 16 connected to the raw water inlet of the reverse osmosis filter element; a double-cavity water storage device 2, which is provided with a first pure water pre-storage cavity 21 and a second pure water pre-storage cavity 22, and the first pure water pre-storage cavity 21 and the second pure water pre-storage cavity 22 can interact to realize synchronous volume change; the pure water outlet 10 of the reverse osmosis filter element 1 can be in communication with the first pure water pre-storage cavity 21 and the second pure water pre-storage cavity 22 alternatively to have a first water supply state and a second water supply state, wherein: in the first water supply state, the reverse osmosis filter element 1 supplies water to the first pure water pre-storage cavity 21 to increase the volume of the first pure water pre-storage cavity 21 while the volume of the second pure water pre-storage cavity 22 is reduced; in the second water supply state, the reverse osmosis filter element 1 supplies water to the second pure water pre-storage cavity 22 to increase the volume of the second pure water pre-storage cavity 22 while the volume of the first pure water pre-storage cavity 21 is reduced.

[0058] The reverse osmosis water purification system provided by the application is characterized in that the double-cavity water storage device 2 is provided with a first pure water pre-storage cavity 21 and a second pure water pre-storage cavity 22, the pure water outlet 10 of the reverse osmosis filter core 1 can be in communication with the first pure water pre-storage cavity 21 and the second pure water pre-storage cavity 22 alternatively to have a first water supply state and a second water supply state, when the system is standby for a period of time and then water is taken again, because the TDS value of the pure water filtered by the reverse osmosis filter core 1 in the early stage is relatively high, the reverse osmosis filter core 1 can be in the first water supply state at this time, the water with a relatively high TDS value filtered by the reverse osmosis filter core 1 in the early stage is delivered to the first pure water pre-storage cavity 21 for pre-storage, the volume of the first pure water pre-storage cavity 21 is increased, the volume of the second pure water pre-storage cavity 22 is reduced, and the water with a relatively low TDS value pre-stored in the second pure water pre-storage cavity 22 is delivered to the faucet 12 for use; when the reverse osmosis filter core 1 works for a period of time and the TDS value of the produced water reaches the relevant requirements, the first water supply state can be terminated, and the water filtered by the reverse osmosis filter core 1 is directly delivered to the faucet 12 for use; after the user finishes taking water, the reverse osmosis filter core 1 can be switched to the second water supply state, the pure water filtered by the reverse osmosis filter core 1 and suitable for drinking is delivered to the second pure water pre-storage cavity 22 for pre-storage, the volume of the second pure water pre-storage cavity 22 is increased, the volume of the first pure water pre-storage cavity 21 is reduced, and the water with a relatively high TDS value pre-stored in the first pure water pre-storage cavity 21 is discharged. Therefore, in the application, by switching the reverse osmosis filter core 1 between the first water supply state and the second water supply state, pre-storing the water with a high TDS value in the first pure water pre-storage cavity 21, pre-storing the water with a low TDS value in the second pure water pre-storage cavity 22, and changing the volumes of the first pure water pre-storage cavity 21 and the second pure water pre-storage cavity 22 by the interaction between the first pure water pre-storage cavity 21 and the second pure water pre-storage cavity 22, it is ensured that the pure water taken by the user always remains in a state suitable for direct drinking with a relatively low TDS value, the health of the user when drinking water is ensured, and the user experience is improved. Compared with the flushing reverse osmosis membrane or pure water backflow mode in the prior art, the application only needs to store a small amount of water with a relatively high TDS value filtered by the reverse osmosis filter core 1 in the first pure water pre-storage cavity 21 and discharge it, so that the amount of waste water produced is smaller, water resources are saved, and the working energy consumption of the whole machine is reduced. In addition, the first pure water pre-storage cavity 21 and the second pure water pre-storage cavity 22 interact to realize the working state of water inflow in one cavity and water discharge in the other cavity, so that the double-cavity water storage device 2 is a pure mechanical structure without electricity, the complexity of the structure of the double-cavity water storage device 2 is reduced, the structure is simplified, and the structure cost and control cost are reduced.

[0059] In addition, as shown in Figure 1 the application is provided with a waste water discharge valve 15, the concentrated water discharged by the reverse osmosis filter core 1 is discharged from the waste water discharge port 14 through the waste water discharge valve 15.

[0060] Regarding the action mode of the volume synchronous change of the first pure water pre-storage cavity 21 and the second pure water pre-storage cavity 22, as a preferred embodiment, as shown in Figure 1As shown, the first pure water pre-storage cavity 21 and the second pure water pre-storage cavity 22 are separated by the partition 3; in the first water supply state, at least part of the partition 3 deforms towards the second pure water pre-storage cavity 22, so that the volume of the first pure water pre-storage cavity 21 increases while the volume of the second pure water pre-storage cavity 22 decreases; in the second water supply state, at least part of the partition 3 deforms towards the first pure water pre-storage cavity 21, so that the volume of the second pure water pre-storage cavity 22 increases while the volume of the first pure water pre-storage cavity 21 decreases.

[0061] As understood by those skilled in the art, the first pure water pre-storage cavity 21 and the second pure water pre-storage cavity 22 are separated by the deformable partition 3, and the partition 3 deforms after water pressure acts on the partition 3, so that the first pure water pre-storage cavity 21 or the second pure water pre-storage cavity 22 is extruded to realize water supply, which is simple in structure, easy to realize and low in cost.

[0062] The present embodiment is not limited in structure and deformation mode of the partition 3. In an embodiment, the partition 3 can be a folding member, when the reverse osmosis filter element 1 is in the first water supply state, the volume of the first pure water pre-storage cavity 21 increases, and the water pressure in the first pure water pre-storage cavity 21 acts on the partition 3 to make the partition 3 deform and expand towards the second pure water pre-storage cavity 22 to extrude the water in the second pure water pre-storage cavity 22; when the reverse osmosis filter element 1 is in the second water supply state, the volume of the second pure water pre-storage cavity 22 increases, and the water pressure in the second pure water pre-storage cavity 22 acts on the partition 3 to make the partition 3 deform and expand towards the first pure water pre-storage cavity 21 to extrude the water in the first pure water pre-storage cavity 21; when the water pressure in the first pure water pre-storage cavity 21 and the second pure water pre-storage cavity 22 disappears, the partition 3 can restore to the folding state. In other embodiments, the partition 3 can also be a member with elastic deformation, so as to elastically deform towards the other one of the first pure water pre-storage cavity 21 and the second pure water pre-storage cavity 22 under the water pressure of the other one.

[0063] It should be noted that the present application is not limited in the mounting mode of the partition 3 in the double-cavity water storage device 2, and as a specific embodiment, the partition 3 can be fixed in the double-cavity water storage device 2 to separate the first pure water pre-storage cavity 21 and the second pure water pre-storage cavity 22. Specifically, the edge of the partition 3 can be fixed to the inner wall of the double-cavity water storage device 2 by welding, bonding or the like, and the center of the partition 3 can deform towards the first pure water pre-storage cavity 21 or the second pure water pre-storage cavity 22.

[0064] As a preferred embodiment, the partition 3 can be movably arranged in the double-cavity water storage device 2; in the first water supply state, the partition 3 moves towards the second pure water pre-storage cavity 22 to increase the volume of the first pure water pre-storage cavity 21 while reducing the volume of the second pure water pre-storage cavity 22; in the second water supply state, the partition 3 moves towards the first pure water pre-storage cavity 21 to increase the volume of the second pure water pre-storage cavity 22 while reducing the volume of the first pure water pre-storage cavity 21.

[0065] As understood by those skilled in the art, the partition 3 can be movably arranged in the double-cavity water storage device 2, and the movement of the partition 3 is matched with the deformation of the partition 3 itself to maximize the ability of the partition 3 to empty the first pure water pre-storage cavity 21 and the second pure water pre-storage cavity 22, maximize the water storage of the first pure water pre-storage cavity 21 or the second pure water pre-storage cavity 22, and improve the space utilization. Taking the reverse osmosis filter core 1 in the first water supply state as an example, in the early stage of the first water supply state, the water pressure in the first pure water pre-storage cavity 21 is small, and the partition 3 only deforms towards the second pure water pre-storage cavity 22 to squeeze out part of the pure water in the second pure water pre-storage cavity 22. When the water pressure in the first pure water pre-storage cavity 21 reaches a certain value, the partition 3 can be pushed to move towards the second pure water pre-storage cavity 22. In an ideal state, when the partition 3 moves towards the second pure water pre-storage cavity 22 to the limit position, the volume of the second pure water pre-storage cavity 22 tends to zero, and the water in the second pure water pre-storage cavity 22 is basically completely emptied, improving the utilization rate of the pure water in the second pure water pre-storage cavity 22. After the pure water in the second pure water pre-storage cavity 22 is emptied, new pure water can be replaced, avoiding the situation that pure water is always left in the second pure water pre-storage cavity 22, which helps to ensure the quality of the pure water in the second pure water pre-storage cavity 22 and reduces the possibility of users using overnight water.

[0066] As a preferred embodiment, the partition 3 can be movably arranged in the double-cavity water storage device 2; in the first water supply state, the partition 3 moves towards the second pure water pre-storage cavity 22 to increase the volume of the first pure water pre-storage cavity 21 while reducing the volume of the second pure water pre-storage cavity 22; in the second water supply state, the partition 3 moves towards the first pure water pre-storage cavity 21 to increase the volume of the second pure water pre-storage cavity 22 while reducing the volume of the first pure water pre-storage cavity 21.

[0067] By setting the partition 3 to be slidable, the smoothness of the movement of the partition 3 can be improved, so that the partition 3 can be moved under the action of a smaller water pressure. The sliding mode of the partition 3 is simple and easy to implement, which helps to simplify the matching structure of the partition 3 in the double-cavity water storage device 2. In addition, the sealing body is arranged between the partition 3 and the double-cavity water storage device 2, which ensures the sealing of the first pure water pre-storage cavity 21 and the second pure water pre-storage cavity 22 respectively, and can effectively prevent water from flowing between the first pure water pre-storage cavity 21 and the second pure water pre-storage cavity 22.

[0068] In other embodiments, the partition 3 can also adopt a moving mode such as swinging, rolling, etc., to make the first water supply state and the second water supply state of the reverse osmosis filter core 1 normally and stably proceed by reciprocating swing or reciprocating roll between the first pure water pre-storage cavity 21 and the second pure water pre-storage cavity 22.

[0069] As a preferred embodiment of the present application, as shown in Figure 1 The reverse osmosis water purification system further comprises a first three-way valve 4, a second three-way valve 7 and a third three-way valve 17; the pure water outlet 10 of the reverse osmosis filter core 1, the pure water inlet and outlet 11 of the second pure water pre-storage cavity 22 and the faucet 12 of the reverse osmosis water purification system are in communication with the first valve port, the second valve port and the third valve port of the first three-way valve 4, respectively; the pure water outlet 10 of the reverse osmosis filter core 1 and the high-concentration water inlet and outlet 13 of the first pure water pre-storage cavity 21 are in communication with the first valve port and the second valve port of the second three-way valve 7, respectively, the third valve port of the second three-way valve 7 is in communication with the first valve port of the third three-way valve 17, and the second valve port and the third valve port of the third three-way valve 17 are in communication with the inlet of the booster pump 16 and the wastewater discharge port 14 of the reverse osmosis water purification system, respectively.

[0070] The first three-way valve 4 realizes the water path connection among the pure water outlet 10 of the reverse osmosis filter core 1, the pure water inlet and outlet 11 of the second pure water pre-storage cavity 22 and the faucet 12 of the reverse osmosis water purification system, the second three-way valve 7 realizes the connection of the pure water outlet 10 of the reverse osmosis filter core 1, the high-concentration water inlet and outlet 13 of the first pure water pre-storage cavity 21 and the third three-way valve 17, and the third three-way valve 17 realizes the connection of the second three-way valve 7, the inlet of the booster pump 16 and the wastewater discharge port 14 of the reverse osmosis water purification system, and the water path is adjusted by opening and closing of the valve ports of the first three-way valve 4, the second three-way valve 7 and the third three-way valve 17, which is convenient to operate. The present application schematically shows that the pure water outlet 10 of the reverse osmosis filter core 1, the pure water inlet and outlet 11 of the second pure water pre-storage cavity 22 and the faucet 12 of the reverse osmosis water purification system are in communication with the A valve port, the B valve port and the C valve port of the first three-way valve 4, respectively, the pure water outlet 10 of the reverse osmosis filter core 1 and the high-concentration water inlet and outlet 13 of the first pure water pre-storage cavity 21 are in communication with the D valve port and the E valve port of the second three-way valve 7, respectively, and the F valve port of the second three-way valve 7, the inlet of the booster pump 16 and the wastewater discharge port 14 are in communication with the G valve port, the H valve port and the I valve port of the third three-way valve 17, respectively. In addition, a second one-way valve 18 can be arranged on the fluid path from the F valve port of the second three-way valve 7 to the G valve port of the third three-way valve 17 to avoid the water flow from the third three-way valve 17 to the second three-way valve 7, which affects the normal operation of the whole machine.

[0071] As a preferred embodiment, as shown in Figure 1As shown in the figure, a high-pressure switch 5 is arranged on the fluid path between the first three-way valve 4 and the pure water inlet and outlet 11. The high-pressure switch 5 can be used to detect the water pressure in the second pure water pre-storage cavity 22, so that the high-pressure switch 5 can send a signal to the second pure water pre-storage cavity 22 to fill the water, so that the system can stop supplying water to the second pure water pre-storage cavity 22 in time to prevent the double-cavity water storage device 2 from generating a pressure phenomenon.

[0072] As a preferred embodiment, as shown in the figure, Figure 1 As shown in the figure, a first one-way valve 6 is arranged on the fluid path between the pure water outlet 10 of the reverse osmosis filter element 1 and the first three-way valve 4, which allows the pure water outlet 10 to the first three-way valve 4 to be one-way. The one-way flow of pure water from the pure water outlet 10 of the reverse osmosis filter element 1 to the first three-way valve 4 is ensured, and the water discharged from the second pure water pre-storage cavity 22 is prevented from flowing towards the reverse osmosis filter element 1 when the first three-way valve 4 fails.

[0073] As a preferred embodiment of the present application, as shown in the figure, Figure 1 A first TDS detection member 8 for detecting the TDS value of the raw water is arranged at the raw water inlet of the reverse osmosis filter element 1, so that the TDS value of the raw water delivered to the reverse osmosis filter element 1 can be monitored in real time. As a preferred embodiment of the present application, as shown in the figure, Figure 1 A second TDS detection member 9 for detecting the TDS value of the pure water is arranged at the pure water outlet 10 of the reverse osmosis filter element 1, so that the TDS value of the pure water filtered by the reverse osmosis filter element 1 can be monitored in real time. According to the size of the measured TDS value of the raw water and the TDS value of the pure water, the switching of the reverse osmosis filter element 1 between the first water supply state, the second water supply state, and the direct water supply to the faucet 12 water end and other water supply states can be controlled.

[0074] In combination Figure 1 , a control method of a reverse osmosis water purification system is provided, which is applied to the reverse osmosis water purification system as described above, and includes the following steps:

[0075] S1: receiving a water taking instruction, and controlling the reverse osmosis water purification system to switch from a standby state to a first water supply state;

[0076] S2: determining whether the TDS value of the pure water at the pure water outlet of the reverse osmosis filter 1 reaches a preset removal rate, and if yes, terminating the first water supply state and delivering the produced water to the faucet 12, otherwise delivering the water produced in the first water supply state into the first pure water pre-storage cavity 21 to deliver the water in the second pure water pre-storage cavity 22 to the faucet 12; specifically, the second TDS detection member 9 can be used to detect the TDS value of the pure water at the pure water outlet of the reverse osmosis filter 1 and transmit relevant information to the machine control system, and the control system determines whether the TDS value of the pure water reaches a preset removal rate (for example, whether the TDS value of the pure water reaches a 90% removal rate), when the TDS value of the pure water reaches the preset removal rate, the produced pure water meets the direct drinking requirement, thus the first water supply state can be terminated and the reverse osmosis filter 1 directly supplies water to the faucet 12. When the TDS value of the pure water does not reach the preset removal rate, the reverse osmosis water purification system is in the first water supply state, the second three-way valve 7 opens the D valve port and the E valve port, the reverse osmosis filter 1 produces water with a higher TDS value into the first pure water pre-storage cavity 21, the first three-way valve 4 opens the B valve port and the C valve port, the partition member 3 is deformed and moved to the right to the second pure water pre-storage cavity 22, the volume of the first pure water pre-storage cavity 21 increases, and the volume of the second pure water pre-storage cavity 22 decreases to deliver the pre-stored water in the second pure water pre-storage cavity 22 to the faucet 12 for use by the user.

[0077] S3: when the faucet 12 is closed, the reverse osmosis water purification system is controlled to switch to the second water supply state, so that the pure water produced in the second water supply state enters the second pure water pre-storage cavity 22 to discharge the water in the first pure water pre-storage cavity 21 to the booster pump 16 to return to the reverse osmosis filter 1 or to the wastewater discharge port 14 of the system; specifically, when the user stops taking water and closes the faucet 12, the first three-way valve 4 closes the C valve port and opens the A valve port and the B valve port, the pure water produced by the reverse osmosis filter 1 enters the second pure water pre-storage cavity 22, the partition member 3 is deformed and moved to the left to the first pure water pre-storage cavity 21, the volume of the second pure water pre-storage cavity 22 increases, and the volume of the first pure water pre-storage cavity 21 decreases to empty the water with a higher TDS value pre-stored in the first pure water pre-storage cavity 21, when the second pure water pre-storage cavity 22 is full according to the water pressure in the second pure water pre-storage cavity 22, the system stops, and the pre-stored water in the second pure water pre-storage cavity 22 is used next time. When the pre-stored water in the first pure water pre-storage cavity 21 is discharged back to the booster pump 16, the second three-way valve 7 opens the E valve port and the F valve port, and the third three-way valve 17 opens the G valve port and the H valve port; when the pre-stored water in the first pure water pre-storage cavity 21 is discharged to the wastewater discharge port 14, the second three-way valve 7 opens the E valve port and the F valve port, and the third three-way valve 17 opens the G valve port and the I valve port.

[0078] S4: after the second water supply state ends, the reverse osmosis water purification system is controlled to switch to the standby state.

[0079] Preferably, in the control method, when the reverse osmosis water purification system is powered on for the first time to perform the first water purification work, the following steps are included:

[0080] S11: Control the reverse osmosis water purification system to switch from the standby state to the first water supply state, so that the pure water produced in the first water supply state enters the first pure water pre-storage cavity 21, so as to discharge the air in the first pure water pre-storage cavity 21 and the second pure water pre-storage cavity 22; the air in the first pure water pre-storage cavity 21 and the second pure water pre-storage cavity 22 is completely discharged, so as to avoid the presence of excess gas in the internal storage to hinder the water production process.

[0081] S12: After the reverse osmosis water purification system continues in the first water supply state for a first time length, the first water supply state is terminated and the produced water is transported to the faucet 12 or switched to the second water supply state so that the pure water produced in the second water supply state enters the second pure water pre-storage cavity 22. Specifically, the first time length can be adjusted according to the flux of the system, for example, the first time length can be 1 minute. After the reverse osmosis water purification system terminates the first water supply state, the produced water can be transported to the faucet 12 to flush the entire waterway; the reverse osmosis water purification system can also enter the second water supply state after the first water supply state is terminated, so that the produced water enters the second pure water pre-storage cavity 22 to flush the second pure water pre-storage cavity 22.

[0082] Preferably, in the control method, the judgment condition for discharging the water in the first pure water pre-storage cavity 21 to the booster pump 16 and backflowing to the reverse osmosis filter element 1 or discharging to the waste water discharge port 14 of the system in step S3 includes: judging the size of the TDS value of the raw water filtered by the reverse osmosis filter element 1 in the first water supply state in step S2 and the first threshold value; when the TDS value of the raw water is less than the first threshold value, the water in the first pure water pre-storage cavity 21 is discharged to the booster pump 16 or the waste water discharge port 14 of the system; when the TDS value of the raw water is greater than the first threshold value, the water in the first pure water pre-storage cavity 21 is discharged to the waste water discharge port 14 of the system. In a preferred embodiment, the first threshold value can be 300 mg / L. When the TDS value of the raw water is less than 300 mg / L, the TDS value of the pure water produced by the reverse osmosis filter element 1 is low, therefore, the pure water with low TDS value stored in the first pure water pre-storage cavity 21 can be discharged to the booster pump 16 or the waste water discharge port 14 of the system; when the TDS value of the raw water is greater than 300 mg / L, the TDS value of the pure water produced by the reverse osmosis filter element 1 is high, in order to avoid the phenomenon of prolonged water production time and poor water production effect caused by backflowing to the booster pump 16, the water with high TDS value stored in the first pure water pre-storage cavity 21 can be completely discharged to the waste water discharge port 14 of the system. Specifically, the first TDS detection piece 8 can detect the TDS value of the raw water at the raw water inlet of the reverse osmosis filter element 1 and transmit the related information to the machine control system.

[0083] Further, the judgment condition of discharging the water in the first pure water pre-storage cavity 21 to the booster pump 16 to return to the reverse osmosis filter element 1 or to the waste water discharge port 14 of the system in step S3 further comprises: when the raw water TDS value is less than the first threshold value, judging the standby time length of the reverse osmosis water purification system before receiving the water taking instruction in step S1; when the standby time length of the reverse osmosis water purification system is less than the first preset time length, discharging all the water in the first pure water pre-storage cavity 21 to the booster pump 16; when the standby time length of the reverse osmosis water purification system is greater than the first preset time length and less than the second preset time length, discharging the water in the first pure water pre-storage cavity 21 to the booster pump 16 first and then to the waste water discharge port 14 of the system after continuing for a third preset time length. Those skilled in the art can understand that the standby time length of the reverse osmosis water purification system also has a great influence on the TDS value of the outlet water, so the raw water TDS value can be combined with the standby time length of the reverse osmosis water purification system before receiving the water taking instruction and other factors to judge whether the water in the first pure water pre-storage cavity 21 is discharged to the booster pump 16 to return to the reverse osmosis filter element 1 or to the waste water discharge port 14 of the system. In the preferred embodiment, the first preset time length can be 30 min, the second preset time length can be 24 h, and the third preset time length can be determined according to the membrane flux of the reverse osmosis filter element 1, for example, the third preset time length can be 5-20 s to meet the use requirements of the reverse osmosis filter element 1 with most membrane fluxes. Under the premise that the raw water TDS value is less than the first threshold value, when the standby time length of the reverse osmosis water purification system before receiving the water taking instruction is less than 30 min, the TDS value of the pure water prepared in the previous stage is small when the system is started again to take water, and this part of water can be discharged to the booster pump 16 to return to the reverse osmosis filter element 1 after being stored in the first pure water pre-storage cavity 21; when the standby time length of the reverse osmosis water purification system before receiving the water taking instruction is greater than 30 min and less than 24 h, the TDS value of the pure water prepared in the previous stage is high when the system is started again to take water, and this part of water can be discharged to the booster pump 16 first and then to the waste water discharge port 14 of the system after continuing for 5-20 s, and the remaining part is discharged to the waste water discharge port 14 of the system.

[0084] Further, in the control method, when the standby time length of the reverse osmosis water purification system is greater than the fourth preset time length and no water taking instruction is received, the reverse osmosis water purification system is controlled to switch from the standby state to the cleaning state, and the pure water prepared in the cleaning state is discharged to the waste water discharge port 14 of the system. In the preferred embodiment, the fourth preset time length can be 24 h, and when the reverse osmosis filter element 1 works again after being stationary for 24 h, the TDS value in the water preparation period is high and the water quantity is large, and the first pure water pre-storage cavity 21 is difficult to meet the pre-storage requirements of the high TDS value pure water, therefore, when the standby time length of the reverse osmosis water purification system is greater than 24 h and no water taking instruction is received, the reverse osmosis filter element 1 can be controlled to switch from the standby state to the cleaning state to continuously prepare water in the cleaning state, and the prepared water is directly discharged to the waste water discharge port 14, thereby achieving the cleaning of the reverse osmosis membrane.

[0085] The places not mentioned in the present application can be realized by using or referring to the existing technology.

[0086] Each of the embodiments in the specification is described in a progressive manner, and the same or similar parts between the embodiments can be referred to each other. Each of the embodiments focuses on the difference from other embodiments.

[0087] The above only describes the embodiments of the present application and is not used to limit the present application. The present application can be variously changed and modified by those skilled in the art. Any modification, equivalent replacement, improvement, etc. within the spirit and principle of the present application shall be included in the scope of claims of the present application.

Claims

1. A control method of a reverse osmosis water purification system, applied to a reverse osmosis water purification system, characterized in that, The reverse osmosis water purification system comprises: a filtering unit comprising a reverse osmosis filter core and a booster pump connected to a raw water inlet of the reverse osmosis filter core; a double-cavity water storage device provided with a first pure water pre-storage cavity and a second pure water pre-storage cavity, the first pure water pre-storage cavity and the second pure water pre-storage cavity being capable of interacting to realize synchronous volume change; a pure water outlet of the reverse osmosis filter core being capable of being in selective communication with the first pure water pre-storage cavity and the second pure water pre-storage cavity to have a first water supply state and a second water supply state, wherein, in the first water supply state, the reverse osmosis filter core supplies water to the first pure water pre-storage cavity to increase the volume of the first pure water pre-storage cavity while decreasing the volume of the second pure water pre-storage cavity, and in the second water supply state, the reverse osmosis filter core supplies water to the second pure water pre-storage cavity to increase the volume of the second pure water pre-storage cavity while decreasing the volume of the first pure water pre-storage cavity; the control method comprising the following steps: S1: receiving a water taking instruction, and controlling the reverse osmosis water purification system to switch from a standby state to a first water supply state; S2: judging whether a pure water TDS value of the pure water outlet of the reverse osmosis filter core reaches a preset removal rate, and if yes, terminating the first water supply state and delivering the produced water to a faucet, and if not, delivering the water produced in the first water supply state into the first pure water pre-storage cavity to deliver the water in the second pure water pre-storage cavity to the faucet; S3: when the faucet is closed, controlling the reverse osmosis water purification system to switch to a second water supply state, so that the pure water produced in the second water supply state enters the second pure water pre-storage cavity to discharge the water in the first pure water pre-storage cavity to the booster pump to return to the reverse osmosis filter core or to a waste water discharge port of the system; S4: after the second water supply state ends, controlling the reverse osmosis water purification system to switch to the standby state.

2. The control method of the reverse osmosis water purification system according to claim 1, characterized in that the judgment condition that the water in the first pure water pre-storage cavity in step S3 is discharged to the booster pump to return to the reverse osmosis filter core or to the waste water discharge port of the system comprises: judging the size of a raw water TDS value filtered by the reverse osmosis filter core in the first water supply state in step S2 and a first threshold value, and when the raw water TDS value is less than the first threshold value, the water in the first pure water pre-storage cavity is discharged to the booster pump or to the waste water discharge port of the system, and when the raw water TDS value is greater than the first threshold value, the water in the first pure water pre-storage cavity is discharged to the waste water discharge port of the system.

3. The control method of the reverse osmosis water purification system according to claim 2, characterized in that the judgment condition that the water in the first pure water pre-storage cavity in step S3 is discharged to the booster pump to return to the reverse osmosis filter core or to the waste water discharge port of the system further comprises: When the TDS value of the raw water is less than the first threshold value, the standby time of the reverse osmosis water purification system before receiving the water taking instruction in step S1 is determined; when the standby time of the reverse osmosis water purification system is less than the first preset time, the water in the first pure water pre-storage cavity is completely discharged to the booster pump; when the standby time of the reverse osmosis water purification system is greater than the first preset time and less than the second preset time, the water in the first pure water pre-storage cavity is first discharged to the booster pump and then discharged to the waste water discharge port of the system after a third preset time.

4. The control method of the reverse osmosis water purification system according to claim 3, characterized in that, when the standby time of the reverse osmosis water purification system is greater than the fourth preset time and no water taking instruction is received, the reverse osmosis water purification system is controlled to switch from the standby state to the cleaning state, and the pure water produced in the cleaning state is discharged to the waste water discharge port of the system.

5. The control method of the reverse osmosis water purification system according to claim 1, characterized in that, when the reverse osmosis water purification system is powered on for the first time, the following steps are included: S11: control the reverse osmosis water purification system to switch from the standby state to the first water supply state, so that the pure water produced in the first water supply state enters the first pure water pre-storage cavity to discharge the air in the first pure water pre-storage cavity and the second pure water pre-storage cavity; S12: after the reverse osmosis water purification system is in the first water supply state for a first time, the first water supply state is terminated and the produced water is transported to the faucet or switched to the second water supply state so that the pure water produced in the second water supply state enters the second pure water pre-storage cavity.

6. A reverse osmosis water purification system controlled by the control method according to any one of claims 1 to 5, characterized in that, The reverse osmosis water purification system includes: a filtration unit including a reverse osmosis filter core and a booster pump connected to a raw water inlet of the reverse osmosis filter core; a double-cavity water storage device provided with a first pure water pre-storage cavity and a second pure water pre-storage cavity, the first pure water pre-storage cavity and the second pure water pre-storage cavity being capable of interacting to realize synchronous volume change; a pure water outlet of the reverse osmosis filter core being capable of being in communication with the first pure water pre-storage cavity and the second pure water pre-storage cavity to have a first water supply state and a second water supply state, wherein in the first water supply state, the reverse osmosis filter core supplies water to the first pure water pre-storage cavity to increase the volume of the first pure water pre-storage cavity while the volume of the second pure water pre-storage cavity is reduced, and in the second water supply state, the reverse osmosis filter core supplies water to the second pure water pre-storage cavity to increase the volume of the second pure water pre-storage cavity while the volume of the first pure water pre-storage cavity is reduced; a first three-way valve; a second three-way valve; a third three-way valve; the pure water outlet of the reverse osmosis filter core, the pure water inlet and outlet of the second pure water pre-storage cavity, and the faucet of the reverse osmosis water purification system being in communication with a first valve port, a second valve port, and a third valve port of the first three-way valve, respectively; the pure water outlet of the reverse osmosis filter core and the high-concentration water inlet and outlet of the first pure water pre-storage cavity being in communication with a first valve port and a second valve port of the second three-way valve, respectively, a third valve port of the second three-way valve being in communication with a first valve port of the third three-way valve, and a second valve port and a third valve port of the third three-way valve being in communication with an inlet of the booster pump and a waste water discharge port of the reverse osmosis water purification system, respectively.

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