Reverse osmosis membrane filter element, water purification system, water purification system control method and water purifier

Abstract

This invention relates to the field of reverse osmosis membrane filter technology, specifically providing a reverse osmosis membrane filter, a water purification system, a control method for the water purification system, and a water purifier. To address the problem of high TDS in the first cup of water after a period of settling in existing reverse osmosis membrane filters, the reverse osmosis membrane filter of this invention has a central tube installed inside the membrane housing. One end of the central tube is sealed, and the other end is open to form a pure water outlet. A membrane pure water outlet is formed on the wall of the central tube. The reverse osmosis membrane is arranged around the central tube. A drive water pipe is installed inside the central tube, with one end abutting against the top wall of the central tube and the other end open to form a first drive water port. A second drive water port communicating with the central tube is formed on the wall of the drive water pipe. A sliding piston is installed in the cavity between the central tube and the drive water pipe, positioned between the membrane pure water outlet and the second drive water port. The piston can be driven up and down by water flow, thereby forcing pure water back into the reverse osmosis membrane for flushing, reducing the TDS value.

Description

Technical Field

[0001] This invention relates to the field of reverse osmosis membrane filter technology, specifically providing a reverse osmosis membrane filter, a water purification system, a control method for the water purification system, and a water purifier. Background Technology

[0002] The increasing severity of environmental and water pollution has seriously threatened people's drinking water health. Reverse osmosis membrane water purification technology has become a relatively common way to produce pure water because it can remove various harmful impurities, heavy metals, viruses, bacteria, etc. from water and has high purification efficiency and thorough removal of harmful substances.

[0003] However, due to the inherent characteristics of the reverse osmosis membrane, after a period of settling, the water that has passed through the membrane and the water that has not passed through the membrane diffuse through ions, causing the TDS (Total Dissolved Solids) to become similar, resulting in a higher TDS value for the first cup of pure water collected by the user when using it again.

[0004] In order to reduce the TDS value of the first cup of pure water, the existing reverse osmosis membrane filter cartridges flush the reverse osmosis membrane by squeezing the pure water backward into the reverse osmosis membrane. However, the existing technology relies solely on the elastic force of the elastic element to complete the squeezing action, which is often insufficient due to insufficient pressure to fully flush the reverse osmosis membrane. As a result, the TDS of the first cup of water is not effectively improved and remains at a high level.

[0005] Accordingly, there is a need in the art for a new reverse osmosis membrane filter to address the problem of high TDS in the first cup of water after a period of settling in existing water purifiers using reverse osmosis membrane filters. Summary of the Invention

[0006] The present invention aims to solve the above-mentioned technical problem, namely, to solve the problem that the TDS of the first cup of water in existing water purifiers using reverse osmosis membrane filter cartridges is high after standing for a period of time.

[0007] In a first aspect, the present invention provides a reverse osmosis membrane filter element, the reverse osmosis membrane filter element comprising a membrane shell, a central tube and a reverse osmosis membrane, the central tube being disposed within the membrane shell, one end of the central tube being sealed and the other end being open to form a pure water outlet, and a membrane pure water outlet being formed on the tube wall of the central tube; the reverse osmosis membrane being arranged around the central tube, the two end faces of the reverse osmosis membrane forming a raw water inlet end face and a wastewater outlet end face respectively, and a raw water cavity being formed between the circumferential surface of the reverse osmosis membrane and the membrane shell;

[0008] A drive water pipe is installed inside the central pipe. One end of the drive water pipe abuts against the top wall of the central pipe, and the other end is open to form a first drive water inlet. A second drive water inlet communicating with the central pipe is opened on the pipe wall of the drive water pipe.

[0009] A slidable piston is provided in the cavity between the central tube and the driving water tube, and the piston is located between the membrane pure water outlet and the second driving water outlet.

[0010] The reverse osmosis membrane filter element also includes an adapter, which is disposed between the inner wall of the membrane housing and the outer wall of the central tube. One side of the adapter forms a wastewater cavity and a wastewater outlet with the outer wall of the central tube. The inner wall of the membrane housing and the other side of the adapter form a raw water inlet, which is connected to the raw water inlet end face through the raw water cavity.

[0011] In the preferred embodiment of the above-mentioned reverse osmosis membrane filter element, the adapter is composed of a coaxial first sleeve and an annular portion, the annular portion abutting against the wastewater outlet end face, and the first sleeve sleeved around the central tube.

[0012] The present invention also provides a water purification system, the water purification system including a reverse osmosis membrane filter element, the reverse osmosis membrane filter element including a membrane shell, a central tube and a reverse osmosis membrane, the central tube being disposed inside the membrane shell, one end of which is sealed and the other end is open to form a pure water outlet, and a membrane pure water outlet is formed on the tube wall of the central tube; the reverse osmosis membrane is arranged around the central tube, and the two end faces of the reverse osmosis membrane respectively form a raw water inlet end face and a wastewater outlet end face, and a raw water cavity is formed between the circumferential surface of the reverse osmosis membrane and the membrane shell;

[0013] A drive water pipe is installed inside the central pipe. One end of the drive water pipe abuts against the top wall of the central pipe, and the other end is provided with a first drive water inlet. A second drive water inlet communicating with the central pipe is provided on the pipe wall of the drive water pipe.

[0014] A slidable piston is provided in the cavity between the central tube and the driving water tube, and the piston is located between the membrane pure water outlet and the second driving water outlet.

[0015] The reverse osmosis membrane filter element also includes an adapter, which is disposed between the inner wall of the membrane housing and the outer wall of the central tube. One side of the adapter forms a wastewater chamber and a wastewater outlet with the outer wall of the central tube. The inner wall of the membrane housing and the other side of the adapter form a raw water inlet, which is connected to the raw water inlet end face through the raw water chamber.

[0016] The water purification system also includes a first inlet pipe, a second inlet pipe, a wastewater outlet pipe, and a pure water outlet pipe;

[0017] One end of the first water inlet pipe is connected to a water source, and the other end is connected to the raw water inlet. The first water inlet pipe is equipped with a first on / off valve and a booster pump.

[0018] One end of the second water inlet pipe is connected to the first drive water inlet, and the other end is connected to the water source. A second on / off valve is provided on the second water inlet pipe.

[0019] One end of the wastewater outlet pipe is connected to the wastewater outlet, and the other end is the wastewater outlet of the water purification system;

[0020] The water purification system also includes a drive outlet pipeline, one end of which is located between the second on / off valve and the first drive water inlet, and the other end is connected to the wastewater outlet of the water purification system. A third on / off valve is provided on the drive outlet pipeline.

[0021] One end of the pure water outlet pipe is connected to the pure water outlet, and the other end is the user's water outlet.

[0022] In the preferred embodiment of the above-mentioned water purification system, the water purification system further includes a pressure sensor, which is installed on the pure water outlet pipe.

[0023] This invention also provides a control method for a water purification system, the water purification system including a reverse osmosis membrane filter element, the reverse osmosis membrane filter element including a membrane shell, a central tube and a reverse osmosis membrane, the central tube being disposed inside the membrane shell, one end of which is sealed and the other end is open to form a pure water outlet, and a membrane pure water outlet is formed on the tube wall of the central tube; the reverse osmosis membrane is arranged around the central tube, and the two end faces of the reverse osmosis membrane respectively form a raw water inlet end face and a wastewater outlet end face, and a raw water cavity is formed between the circumferential surface of the reverse osmosis membrane and the membrane shell;

[0024] A drive water pipe is installed inside the central pipe. One end of the drive water pipe abuts against the top wall of the central pipe, and the other end is provided with a first drive water inlet. A second drive water inlet communicating with the central pipe is provided on the pipe wall of the drive water pipe.

[0025] A slidable piston is provided in the cavity between the central tube and the driving water tube, and the piston is located between the membrane pure water outlet and the second driving water outlet.

[0026] The reverse osmosis membrane filter element also includes an adapter, which is disposed between the inner wall of the membrane housing and the outer wall of the central tube. One side of the adapter forms a wastewater chamber and a wastewater outlet with the outer wall of the central tube. The inner wall of the membrane housing and the other side of the adapter form a raw water inlet, which is connected to the raw water inlet end face through the raw water chamber.

[0027] The water purification system also includes a first inlet pipe, a second inlet pipe, a wastewater outlet pipe, and a pure water outlet pipe;

[0028] One end of the first water inlet pipe is connected to a water source, and the other end is connected to the raw water inlet. The first water inlet pipe is equipped with a first on / off valve and a booster pump.

[0029] One end of the second water inlet pipe is connected to the first drive water inlet, and the other end is connected to the water source. A second on / off valve is provided on the second water inlet pipe.

[0030] One end of the wastewater outlet pipe is connected to the wastewater outlet, and the other end is the wastewater outlet of the water purification system;

[0031] The water purification system also includes a drive outlet pipeline, one end of which is located between the second on / off valve and the first drive water inlet, and the other end is connected to the wastewater outlet of the water purification system. A third on / off valve is provided on the drive outlet pipeline.

[0032] One end of the pure water outlet pipe is connected to the pure water outlet, and the other end is the user's water outlet;

[0033] The control method is characterized by comprising:

[0034] When the user's water outlet is closed, the piston is controlled to move upward.

[0035] When the piston reaches the first preset position, the piston is controlled to move downward.

[0036] In the preferred embodiment of the control method for the above-mentioned water purification system, the step of "controlling the piston to move upward" specifically includes:

[0037] Keep the first on / off valve and the booster pump in the open state, and keep the second on / off valve in the closed state;

[0038] Open the third on / off valve.

[0039] In a preferred embodiment of the control method for the aforementioned water purification system, the water purification system further includes a pressure sensor, which is installed on the pure water outlet pipe; the step of "controlling the piston to move downward when the piston reaches the first preset position" further includes:

[0040] When the piston reaches the first preset position and the pressure value at the pressure sensor is greater than the preset pressure value, the piston is controlled to move downward.

[0041] In the preferred embodiment of the control method for the aforementioned water purification system, the step of "controlling the piston to move downward when the piston reaches the first preset position and the pressure value at the pressure sensor is greater than the preset pressure value" specifically includes:

[0042] When the piston reaches the first preset position and the pressure value at the pressure sensor is greater than the preset pressure value, the first on / off valve and the booster pump are closed, the third on / off valve is closed, and the second on / off valve is opened.

[0043] In the preferred embodiment of the control method for the aforementioned water purification system, after the step of "controlling the piston to move downward when the piston reaches the first preset position and the pressure value at the pressure sensor is greater than the preset pressure value", the control method includes:

[0044] When the piston reaches the second preset position, the second on / off valve is closed.

[0045] The present invention also provides a water purifier, which includes the above-described water purification system and is capable of executing the control method of the above-described water purification system.

[0046] Those skilled in the art will understand that the reverse osmosis membrane filter element of the present invention includes a membrane housing, a central tube, and a reverse osmosis membrane. The central tube is disposed within the membrane housing, with one end sealed and the other end open to form a pure water outlet. A membrane pure water outlet is formed on the wall of the central tube. The reverse osmosis membrane is arranged around the central tube, with its two end faces forming a raw water inlet and a wastewater outlet, respectively. A raw water cavity is formed between the circumferential surface of the reverse osmosis membrane and the membrane housing. A drive water pipe is disposed inside the central tube, with one end abutting against the top wall of the central tube and the other end... The end opening forms the first drive water port, and the wall of the drive water pipe has a second drive water port that communicates with the central pipe; a sliding piston is installed in the cavity between the central pipe and the drive water pipe, and the piston is located between the membrane pure water outlet and the second drive water port; the reverse osmosis membrane filter element also includes an adapter, which is located between the inner wall of the membrane housing and the outer wall of the central pipe, and one side of the adapter and the outer wall of the central pipe form a wastewater cavity and a wastewater outlet; the inner wall of the membrane housing and the other side of the adapter form a raw water inlet, and the raw water inlet and the raw water inlet end face are connected through the raw water cavity.

[0047] With the above technical solution, the reverse osmosis membrane filter element of the present invention can drive the piston to move up and down through water flow, thereby squeezing pure water into the reverse osmosis membrane in the reverse direction, thus flushing the reverse osmosis membrane and removing TDS and harmful substances from the reverse osmosis membrane with the pure water. As a result, the TDS content in the first cup of pure water when the user uses the water purifier next time is lower and the water quality is better. Specifically, the tap water source is connected to the raw water inlet. During normal water production, the water circuit where the drive water pipe is located is in a closed state, so that the piston cannot slide freely. After the tap water enters the raw water chamber, the tap water is forced into the raw water inlet end face of the reverse osmosis membrane by the inlet water pressure. Preferably, the tap water is forced into the reverse osmosis membrane by a booster pump, so that the wastewater containing dissolved salts, colloids, microorganisms, organic matter, etc. is discharged from the wastewater outlet, while the pure water obtained flows out from the pure water outlet for the user. The upper cavity of the piston is filled with tap water, and the lower cavity of the piston is filled with pure water, with the tap water volume being greater than the pure water volume. When the user stops using pure water, tap water continues to be forced into the reverse osmosis membrane. The drive water pipe is connected to the outside through the drain outlet of the water purifier. The piston moves upward under the push of the pure water. The tap water in the upper part of the piston is discharged into the drive water pipe through the second drive water port and finally discharged from the drive water pipe through the first drive water port. At this time, the amount of pure water in the lower cavity of the piston is greater than the amount of tap water in the upper part. Then, the water path connecting the drive water pipe and the drain outlet of the water purifier is closed, and tap water is introduced into the drive water pipe. During reverse flushing, the pressure of the tap water drives the piston to move downward, thereby forcing the pure water in the lower part of the piston back into the reverse osmosis membrane to flush the reverse osmosis membrane. The displaced tap water and wastewater are discharged through the wastewater outlet, thereby reducing the TDS value of the water remaining in the reverse osmosis membrane and thus reducing the initial TDS value of the water purifier. Compared to existing reverse osmosis membrane filter cartridges that use the rebound force of elastic elements to squeeze pure water into the reverse osmosis membrane, the reverse osmosis membrane filter cartridge of this invention has a lower manufacturing cost and a completely redesigned structure, enabling the water purifier to achieve performance that conventional spring settings cannot. The size of the chamber where the piston of the reverse osmosis membrane filter cartridge is located can be set according to different TDS value requirements. The larger the chamber where the piston is located, the more pure water can be stored, and the better the flushing effect on the reverse osmosis membrane. Furthermore, since water is passed into the reverse osmosis membrane filter cartridge from the outside, the piston is driven by water pressure, and the water pressure can be adjusted as needed, allowing pure water to flush the reverse osmosis membrane from all directions, further reducing the TDS value. Attached Figure Description

[0048] The preferred embodiments of the present invention are described below with reference to the accompanying drawings, in which:

[0049] Figure 1 This is a schematic diagram of the water flow direction inside the reverse osmosis membrane filter cartridge during normal water production;

[0050] Figure 2This is a schematic diagram showing the water flow direction inside the reverse osmosis membrane filter cartridge when the user stops using it;

[0051] Figure 3 This is a schematic diagram showing the water flow direction inside the reverse osmosis membrane filter element during backwashing;

[0052] Figure 4 This is a schematic diagram of a water purification system;

[0053] Figure 5 This is a flowchart of the main steps of the control method for a water purification system;

[0054] Figure 6 This is a flowchart illustrating one implementation method of a water purification system control method.

[0055] List of reference numerals in the attached diagram:

[0056] 1. Reverse osmosis membrane filter element; 11. Membrane housing; 12. Central tube; 121. Pure water outlet; 122. Membrane pure water outlet; 13. Reverse osmosis membrane; 131. Raw water inlet face; 132. Wastewater outlet face; 14. Raw water chamber; 141. Raw water inlet; 15. Drive water pipe; 151. First drive water inlet; 152. Second drive water inlet; 16. Piston; 17. Adapter; 171. First sleeve; 172. Circular part; 18. Wastewater chamber; 19. 1. Wastewater outlet; 2. First inlet pipe; 21. First on / off valve; 22. Booster pump; 23. Pre-filter; 3. Second inlet pipe; 31. Second on / off valve; 4. Wastewater outlet pipe; 41. Wastewater outlet of the water purification system; 42. Wastewater valve; 5. Drive outlet pipe; 51. Third on / off valve; 6. Pure water outlet pipe; 61. Pressure sensor; 62. Check valve; 63. Post-filter; 64. Flow switch; 7. Water source; 8. User outlet. Detailed Implementation

[0057] Preferred embodiments of the present invention will now be described with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are merely illustrative of the technical principles of the invention and are not intended to limit the scope of protection of the invention. Those skilled in the art can make adjustments as needed to adapt to specific applications.

[0058] It should be noted that in the description of this invention, terms such as "center," "top," "upper," "lower," "inner," and "outer," indicating directional or positional relationships, are based on the directional or positional relationships shown in the accompanying drawings. These are merely for ease of description and do not indicate or imply that the device or element must have a specific orientation, or be constructed and operated in a specific orientation; therefore, they should not be construed as limitations on this invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0059] Furthermore, it should be noted that, in the description of this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0060] like Figures 1 to 4 As shown, the white arrows indicate the flow direction of raw water and wastewater, while the black arrows indicate the flow direction of pure water. To address the issue of high TDS in the first cup of water after a period of settling in existing water purifiers using reverse osmosis membrane filters, the reverse osmosis membrane filter 1 of this invention includes a membrane housing 11, a central tube 12, and a reverse osmosis membrane 13. The central tube 12 is disposed within the membrane housing 11, with one end sealed and the other end open to form a pure water outlet 121. A membrane pure water outlet 122 is formed on the wall of the central tube 12. The reverse osmosis membrane 13 is arranged around the central tube 12, with its two end faces forming a raw water inlet end face 131 and a wastewater outlet end face 132, respectively. A raw water cavity 14 is formed between the circumferential surface of the reverse osmosis membrane 13 and the membrane housing 11. A drive water pipe 15 is disposed within the central tube 12, driving the water... One end of the tube 15 abuts against the top wall of the central tube 12, and the other end opens to form a first drive water inlet 151. A second drive water inlet 152 communicating with the central tube 12 is opened on the tube wall of the drive water tube 15. A slidable piston 16 is provided in the cavity between the central tube 12 and the drive water tube 15. The piston 16 is located between the membrane pure water outlet 122 and the second drive water inlet 152. The reverse osmosis membrane filter element 1 also includes an adapter 17. The adapter 17 is located between the inner wall of the membrane housing 11 and the outer wall of the central tube 12. One side of the adapter 17 and the outer wall of the central tube 12 form a wastewater cavity 18 and a wastewater outlet 181. The inner wall of the membrane housing 11 and the other side of the adapter 17 form a raw water inlet 141. The raw water inlet 141 and the raw water inlet end face 131 are connected through the raw water cavity 14.

[0061] The reverse osmosis membrane filter element 1 of this invention enables the piston 16 to move up and down via water flow, thereby forcing pure water into the reverse osmosis membrane 13, thus flushing the reverse osmosis membrane 13 and removing TDS and harmful substances from the membrane with the pure water. This results in a lower TDS content and better water quality in the first cup of pure water when the user uses the water purifier next time. Specifically, combined with... Figure 1 and Figure 4The specific implementation of this invention is described below. A tap water source 7 is connected to a raw water inlet 141. During normal water production, the water path where the drive water pipe 15 is located is closed, preventing the piston 16 from sliding freely. After the tap water enters the raw water chamber 14, it is forced into the raw water inlet face 131 of the reverse osmosis membrane 13 by the inlet pressure. Preferably, the tap water is forced into the reverse osmosis membrane 13 by a booster pump 22, thereby causing wastewater containing dissolved salts, colloids, microorganisms, organic matter, etc., to be discharged from the wastewater outlet 181. The resulting pure water flows out from the pure water outlet 121 for user use. The upper cavity of the piston 16 is filled with tap water, and the lower cavity of the piston 16 is filled with pure water, with the tap water volume greater than the pure water volume. Continuing with... Figure 2 and Figure 4 The process is as follows: When the user stops using pure water, tap water continues to be forced into the reverse osmosis membrane 13. The drive water pipe 15 is connected to the outside through the wastewater outlet 41 of the water purifier's purification system. The piston 16 moves upward under the push of the pure water. The tap water in the upper part of the piston 16 is discharged into the drive water pipe 15 through the second drive water outlet 152, and finally discharged from the drive water pipe 15 through the first drive water outlet 151. At this time, the amount of pure water in the lower cavity of the piston 16 is greater than the amount of tap water in the upper cavity. Then, the process continues... Figure 3 and Figure 4 The process involves closing the water passage connecting the drive water pipe 15 to the wastewater outlet 41 of the water purifier's purification system, and then introducing tap water into the drive water pipe 15. During reverse flushing, the pressure of the tap water drives the piston 16 to move downwards, thereby forcing the pure water at the bottom of the piston 16 into the reverse osmosis membrane 13 to flush the reverse osmosis membrane 13. The displaced tap water and wastewater are discharged through the wastewater outlet 181, thereby reducing the TDS value of the water remaining in the reverse osmosis membrane 13 and thus reducing the initial TDS value of the water purifier. Compared to the structure in the prior art reverse osmosis membrane filter cartridges that use the rebound force of elastic elements to squeeze pure water into the reverse osmosis membrane, the reverse osmosis membrane filter cartridge 1 of the present invention has a lower manufacturing cost. Furthermore, the size of the cavity where the piston 16 of the reverse osmosis membrane filter cartridge 1 is located can be set according to different TDS value requirements. The larger the cavity where the piston 16 is located, the more pure water can be stored, and the better the flushing effect on the reverse osmosis membrane 13. Moreover, since water is passed into the reverse osmosis membrane filter cartridge 1 from the outside, the piston 16 is driven by water pressure, and the water pressure can be adjusted as needed, so that pure water can flush the reverse osmosis membrane 13 from all directions, further reducing the TDS value.

[0062] like Figure 1As shown, in one possible embodiment, the adapter 17 consists of a first sleeve 171 and an annular portion 172 coaxially fixedly connected. The annular portion 172 abuts against the wastewater outlet end face 132, and the first sleeve 171 is sleeved around the central tube 12. The annular portion 172 of the adapter 17 abuts against the wastewater outlet end face 132, and the first sleeve 171 is sleeved around the central tube 12, such that one side of the first sleeve 171 forms a wastewater cavity 18 and a wastewater outlet 181 with the outer wall of the central tube 12, and the other side of the first sleeve 171 forms a raw water inlet 141 with the inner wall of the membrane shell 11.

[0063] It should be noted that the above embodiments are merely used to illustrate the principles of the present invention and are not intended to limit the scope of protection of the present invention. Without departing from the principles of the present invention, those skilled in the art can adjust the above structure so that the present invention can be applied to more specific application scenarios.

[0064] For example, in an alternative embodiment, the adapter 17 can also be a round tube, one end of which is bonded to the wastewater outlet end face 132. The round tube is simpler to manufacture and has a lower cost. It is directly bonded to the wastewater outlet end face 132, which provides better sealing and makes it less likely for water to seep between the wastewater chamber 18 and the raw water chamber 14. However, this is not a limitation. Those skilled in the art can modify the structure of the adapter 17 as needed. In addition, the adapter 17 can also be integrally formed with the membrane shell 11 or the central tube 12, and holes for raw water or wastewater to pass through can be provided on the adapter 17. These adjustments do not deviate from the principle of the present invention and therefore all fall within the protection scope of the present invention.

[0065] Finally, it should be noted that although the present invention is described using a reverse osmosis membrane filter element 1 applied to a water purifier as an example, the reverse osmosis membrane filter element 1 of the present invention can obviously also be applied to other equipment that requires water purification, such as sewage treatment equipment or medical equipment.

[0066] In addition, such as Figures 1 to 4 As shown, the present invention also provides a water purification system, which includes a reverse osmosis membrane filter element 1. The reverse osmosis membrane filter element 1 includes a membrane housing 11, a central tube 12, and a reverse osmosis membrane 13. The central tube 12 is disposed inside the membrane housing 11, with one end sealed and the other end open to form a pure water outlet 121. A membrane pure water outlet 122 is provided on the tube wall of the central tube 12. The reverse osmosis membrane 13 is arranged around the central tube 12. The two end faces of the reverse osmosis membrane 13 respectively form a raw water inlet end face 131 and a wastewater outlet end face 132. A raw water cavity 14 is formed between the circumferential surface of the reverse osmosis membrane 13 and the membrane housing 11.

[0067] A drive water pipe 15 is provided inside the central pipe 12. One end of the drive water pipe 15 abuts against the top wall of the central pipe 12, and the other end is provided with a first drive water port 151. A second drive water port 152 communicating with the central pipe 12 is provided on the pipe wall of the drive water pipe 15.

[0068] A slidable piston 16 is provided in the cavity between the central tube 12 and the drive water tube 15. The piston 16 is located between the membrane pure water outlet 122 and the second drive water outlet 152.

[0069] The reverse osmosis membrane filter element 1 also includes an adapter 17, which is disposed between the inner wall of the membrane housing 11 and the outer wall of the central tube 12. One side of the adapter 17 and the outer wall of the central tube 12 form a wastewater chamber 18 and a wastewater outlet 181. The inner wall of the membrane housing 11 and the other side of the adapter 17 form a raw water inlet 141, which is connected to the raw water inlet end face 131 through the raw water chamber 14.

[0070] The water purification system also includes a first inlet pipe 2, a second inlet pipe 3, a wastewater outlet pipe 4, and a pure water outlet pipe 6;

[0071] One end of the first water inlet pipe 2 is connected to the water source 7, and the other end is connected to the raw water inlet 141. The first water inlet pipe 2 is equipped with a first on / off valve 21 and a booster pump 22.

[0072] One end of the second water inlet pipe 3 is connected to the first drive water inlet 151, and the other end is connected to the water source 7. A second on / off valve 31 is provided on the second water inlet pipe 3.

[0073] One end of the wastewater outlet pipe 4 is connected to the wastewater outlet 181, and the other end is the wastewater outlet 41 of the water purification system;

[0074] The water purification system also includes a drive outlet pipe 5. One end of the drive outlet pipe 5 is located between the second on / off valve 31 and the first drive water port 151, and the other end is connected to the wastewater port 41 of the water purification system. A third on / off valve 51 is provided on the drive outlet pipe 5.

[0075] One end of the pure water outlet pipe 6 is connected to the pure water outlet 121, and the other end is the user outlet 8; a pressure sensor 61 is installed on the pure water outlet pipe 6.

[0076] The advantages of the above setting method are as follows: the pressure sensor 61 detects the water pressure in the pure water outlet pipe 6 and sends the water pressure of the pure water outlet pipe 6 to the computer board. The computer board controls the opening and closing of various valves and booster pump 22 according to the water pressure. For example, when the user outlet 8 is open, the pressure at the pressure sensor 61 is less than the pressure at the pressure sensor 61 when the user outlet 8 is closed. That is, when the pressure value at the pressure sensor 61 is greater than the first preset pressure value, it means that the user has stopped using water and the user outlet 8 is closed; when the pressure value at the pressure sensor 61 is less than or equal to the first preset pressure value, it means that the user is using pure water normally and the user outlet 8 is open.

[0077] Combination Figure 1 and Figure 4 As introduced, when the water purification system is producing water normally, the user outlet 8 is opened, the first on / off valve 21 and the booster pump 22 on the first inlet pipe 2 are turned on, and the tap water from the water source 7 enters the first inlet pipe 2, passes through the first on / off valve 21 and the booster pump 22 to enter the raw water inlet 141, passes through the raw water chamber 14 to enter the reverse osmosis membrane 13, and the wastewater obtained after filtration by the reverse osmosis membrane 13 enters the wastewater outlet pipe 4 through the wastewater outlet 181 and is discharged from the water purification system through the wastewater outlet 41. The pure water enters the pure water outlet pipe 6 through the membrane pure water outlet 122 and the pure water outlet 121 to reach the user outlet 8.

[0078] Combination Figure 2 and Figure 4 The process is as follows: When the user stops using water, the user outlet 8 closes, the first on / off valve 21 and the booster pump 22 on the first inlet pipe 2 remain open, and the third on / off valve 51 on the drive outlet pipe 5 opens. The drive water pipe 15 and the drive outlet pipe 5 are connected to the outside through the wastewater outlet 41 of the water purification system, so that the piston 16 can move upward under the push of pure water. At the same time, the piston 16 squeezes the tap water in the upper part into the drive water pipe 15 through the second drive water outlet 152, and then into the drive outlet pipe 5 through the first drive water outlet 151. Finally, it is discharged from the water purification system through the wastewater outlet 41 of the water purification system. Meanwhile, the lower part of the piston 16 is filled with pure water, and when the water pressure at the pressure sensor 61 reaches the preset pressure value, it indicates that the lower cavity of the piston 16 is filled with pure water.

[0079] Combination Figure 3 and Figure 4As described, after the lower cavity of piston 16 is filled with pure water, the first on / off valve 21, booster pump 22 and third on / off valve 51 are closed, and the second on / off valve 31 is opened. Tap water from water source 7 enters the second inlet pipe 3, and then enters the drive water pipe 15 through the second on / off valve 31 and the first drive water port 151. Tap water enters the cavity between the central pipe 12 and the drive water pipe 15 through the second drive water port 152. Driven by the pressure of tap water, piston 16 moves downward, and the pure water at the lower part of piston 16 is squeezed in the reverse osmosis membrane 13 to flush the reverse osmosis membrane 13, displacing the raw water and wastewater in the reverse osmosis membrane 13. The flushed wastewater is discharged from the water purification system through the wastewater chamber 18, wastewater outlet 181 and wastewater outlet pipe 4, and then discharged from the water purification system wastewater port 41.

[0080] like Figure 4 As shown, in one possible implementation, the water purification system further includes a pre-filter 23, a one-way valve 62, a post-filter 63, and a flow switch 64. The pre-filter 23 is disposed between the water source 7 of the first inlet pipe 2 and the first on / off valve 21. The one-way valve 62 is disposed between the pure water outlet 121 of the pure water outlet pipe 6 and the pressure sensor 61. The post-filter 63 and the flow switch 64 are disposed sequentially between the pressure sensor 61 of the pure water outlet pipe 6 and the user outlet 8. Preferably, a wastewater valve 42 is also disposed on the wastewater outlet pipe 4.

[0081] The advantages of the above setup are as follows: the pre-filter 23 of the water purification system pre-filters the tap water, filtering out larger particles before it enters the reverse osmosis membrane 13 for filtration, thereby increasing the service life of the reverse osmosis membrane 13. Furthermore, the one-way valve 62 can prevent pure water from flowing back into the reverse osmosis membrane filter 1, improving the stability of the water purification system. The post-filter 63 can further filter the pure water, further improving the quality of the pure water. Users can adjust the flow rate by adjusting the size of the flow switch 64. The wastewater valve 42 is used to control the opening and closing of the wastewater outlet pipe 4.

[0082] For example, in an alternative embodiment, in addition to setting a pressure sensor 61 on the pure water outlet pipe 6 to obtain the signal of opening and closing of the user outlet 8 by detecting the pressure value, an inductive switch can also be set at the user outlet 8 to send the signal of opening and closing of the user outlet 8 to the computer board, thereby controlling the opening and closing state of each valve and the booster pump 22 according to the opening and closing of the user outlet 8; or the user can manually control the opening and closing state of each valve and the booster pump 22 when using the water purification system. Those skilled in the art can make selections as needed. These adjustments do not deviate from the principle of the present invention and therefore all fall within the protection scope of the present invention.

[0083] In addition, such as Figures 1 to 6As shown, the present invention also provides a control method for a water purification system. The water purification system includes a reverse osmosis membrane filter element 1. The overall structure of the reverse osmosis membrane filter element 1 is the same as that of the reverse osmosis membrane filter element described above, so it will not be described again.

[0084] Continue to refer to Figure 1 and Figure 4 The water purification system also includes a first inlet pipe 2, a second inlet pipe 3, a wastewater outlet pipe 4, and a pure water outlet pipe 6;

[0085] One end of the first water inlet pipe 2 is connected to the water source 7, and the other end is connected to the raw water inlet 141. The first water inlet pipe 2 is equipped with a first on / off valve 21 and a booster pump 22.

[0086] One end of the second water inlet pipe 3 is connected to the first drive water inlet 151, and the other end is connected to the water source 7. A second on / off valve 31 is provided on the second water inlet pipe 3.

[0087] One end of the wastewater outlet pipe 4 is connected to the wastewater outlet 181, and the other end is the wastewater outlet 41 of the water purification system;

[0088] The water purification system also includes a drive outlet pipe 5. One end of the drive outlet pipe 5 is located between the second on / off valve 31 and the first drive water port 151, and the other end is connected to the wastewater port 41 of the water purification system. A third on / off valve 51 is provided on the drive outlet pipe 5.

[0089] One end of the pure water outlet pipe 6 is connected to the pure water outlet 121, and the other end is the user outlet 8;

[0090] Reference Figure 5 As shown, the control methods include:

[0091] Step S01: When the user's water outlet is closed, the control piston moves upward;

[0092] Step S02: When the piston reaches the first preset position, control the piston to move downward.

[0093] Combination Figure 2 and Figure 4 When the user's water outlet 8 is closed, the user stops using pure water. At this time, the control piston 16 moves upward, and pure water enters the cavity where piston 16 is located. When piston 16 reaches the first preset position, it means that piston 16 can no longer move upward, and the lower part of piston 16 is filled with pure water. Figure 3 At this time, the control piston 16 moves downward and forces the pure water in the chamber into the reverse osmosis membrane 13 to flush the reverse osmosis membrane 13, displacing the raw water and wastewater in the reverse osmosis membrane 13, thereby reducing the TDS value of the first cup of water in the water purification system.

[0094] The step of "controlling the piston to move upward" in step S01 specifically includes:

[0095] Reference Figure 6 As shown, step S011: Keep the first on / off valve and the booster pump in the open state, keep the second on / off valve in the closed state; open the third on / off valve.

[0096] Combination Figure 1 and Figure 4 Before step S01, when the user is producing water normally, the user outlet 8 is open, the first on / off valve 21 and the booster pump 22 are open, and the second on / off valve 31 and the third on / off valve 51 are closed. At this time, the piston 16 cannot move freely. (Refer to...) Figure 2 , Figure 4 When the user stops using pure water and the user outlet 8 is closed, the control piston 16 moves upward. Specifically, the first on / off valve 21 and the booster pump 22 are kept open, the second on / off valve 31 is kept closed, and the third on / off valve 51 is opened. The piston 16 moves upward under the push of the pure water below it.

[0097] Reference Figure 4 The water purification system also includes a pressure sensor 61, which is installed on the pure water outlet pipe 6; step S02 further includes:

[0098] When the piston reaches the first preset position and the pressure value at the pressure sensor is greater than the preset pressure value, the piston is controlled to move downward.

[0099] Combination Figure 2 and Figure 4 When piston 16 reaches the first preset position, it has reached its limit and cannot move upwards further. Although piston 16 can no longer move upwards, it doesn't necessarily mean that the lower cavity of piston 16 is completely filled with pure water. Therefore, a pressure sensor 61 is installed on the pure water outlet pipe 6. When piston 16 reaches the first preset position and the pressure at pressure sensor 61 reaches the preset pressure value, it indicates that the lower cavity of piston 16 is completely filled with pure water. This prevents the rinsing effect from being affected if piston 16 reaches the first preset position without the cavity being completely filled with pure water. Figure 3 Then, control the piston 16 to move downwards, squeezing the pure water back into the reverse osmosis membrane 13.

[0100] The steps of "controlling the piston to move downward when the piston reaches the first preset position and the pressure value at the pressure sensor is greater than the preset pressure value" specifically include:

[0101] Continue to refer to Figure 6 Step S021: When the piston reaches the first preset position and the pressure value at the pressure sensor is greater than the preset pressure value, close the first on / off valve and the booster pump; close the third on / off valve; and open the second on / off valve.

[0102] To control the piston to move downwards, specifically refer to... Figure 3 and Figure 4 The first on / off valve 21 and the booster pump 22 are closed, the third on / off valve 51 is closed, and the second on / off valve 31 is opened. Tap water enters the drive water pipe 15 through the second inlet pipe 3, and then enters the cavity where the piston 16 is located through the second drive water port 152. Under the pressure of the tap water, the piston 16 moves downward. The downward movement of the piston 16 forces the pure water to flow back into the reverse osmosis membrane 13, displacing the raw water and wastewater in the reverse osmosis membrane 13.

[0103] Following step S021, the control method further includes:

[0104] Step S03: When the piston reaches the second preset position, close the second on / off valve.

[0105] Combination Figure 3 and Figure 4 When piston 16 moves downward to the second preset position, piston 16 can no longer move downward. At this time, the second on / off valve 31 is closed, and water is stopped flowing into the drive water pipe 15.

[0106] The present invention also provides a water purifier that includes the above-described water purification system and is capable of executing the control method of the above-described water purification system.

[0107] The technical solution of the present invention has been described above with reference to the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of the present invention is obviously not limited to these specific embodiments. Without departing from the principles of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after such changes or substitutions will all fall within the scope of protection of the present invention.

Claims

1. A reverse osmosis membrane cartridge, characterized by, The reverse osmosis membrane filter core comprises a membrane shell, a center tube and a reverse osmosis membrane, the center tube is arranged in the membrane shell, one end of the center tube is closed, the other end is open to form a pure water outlet, and a membrane pure water outlet is arranged on the wall of the center tube; the reverse osmosis membrane is arranged around the center tube, two end faces of the reverse osmosis membrane form a raw water inlet end face and a waste water outlet end face respectively, and a raw water cavity is formed between the circumferential surface of the reverse osmosis membrane and the membrane shell; A driving water pipe is arranged in the center tube, one end of the driving water pipe abuts against the top wall of the center tube, the other end is open to form a first driving water outlet, and a second driving water outlet is arranged on the wall of the driving water pipe and communicates with the center tube; A slidable piston is arranged in the cavity between the center tube and the driving water pipe, and the piston is arranged between the membrane pure water outlet and the second driving water outlet; The reverse osmosis membrane filter core further comprises an adapter, the adapter is arranged between the inner wall of the membrane shell and the outer wall of the center tube, one side of the adapter and the outer wall of the center tube form a waste water cavity and a waste water outlet, the inner wall of the membrane shell and the other side of the adapter form a raw water inlet, and the raw water inlet and the raw water inlet end face communicate through the raw water cavity.

2. The reverse osmosis membrane cartridge of claim 1, wherein, The adapter is composed of a first sleeve and a circular ring part, the circular ring part abuts against the waste water outlet end face, and the first sleeve is sleeved on the periphery of the center tube.

3. A water purification system characterized by, The water purification system comprises a reverse osmosis membrane filter core, the reverse osmosis membrane filter core comprises a membrane shell, a center tube and a reverse osmosis membrane, the center tube is arranged in the membrane shell, one end of the center tube is closed, the other end is open to form a pure water outlet, and a membrane pure water outlet is arranged on the wall of the center tube; the reverse osmosis membrane is arranged around the center tube, two end faces of the reverse osmosis membrane form a raw water inlet end face and a waste water outlet end face respectively, and a raw water cavity is formed between the circumferential surface of the reverse osmosis membrane and the membrane shell; A driving water pipe is arranged in the center tube, one end of the driving water pipe abuts against the top wall of the center tube, the other end is open to form a first driving water outlet, and a second driving water outlet is arranged on the wall of the driving water pipe and communicates with the center tube; A slidable piston is arranged in the cavity between the center tube and the driving water pipe, and the piston is arranged between the membrane pure water outlet and the second driving water outlet; The reverse osmosis membrane filter core further comprises an adapter, the adapter is arranged between the inner wall of the membrane shell and the outer wall of the center tube, one side of the adapter and the outer wall of the center tube form a waste water cavity and a waste water outlet, the inner wall of the membrane shell and the other side of the adapter form a raw water inlet, and the raw water inlet and the raw water inlet end face communicate through the raw water cavity. The water purification system further comprises a first water inlet pipeline, a second water inlet pipeline, a waste water outlet pipeline and a pure water outlet pipeline; One end of the first water inlet pipeline is connected with a water source, the other end is connected with the raw water inlet, and a first on-off valve and a booster pump are arranged on the first water inlet pipeline; One end of the second water inlet pipeline is connected with the first driving water outlet, the other end is connected with the water source, and a second on-off valve is arranged on the second water inlet pipeline; One end of the wastewater outlet pipeline is connected with the wastewater outlet, and the other end is a wastewater outlet of the water purification system; The water purification system further comprises a driving outlet pipeline, one end of the driving outlet pipeline is arranged between the second on-off valve and the first driving water outlet, and the other end is connected with the wastewater outlet of the water purification system, and a third on-off valve is arranged on the driving outlet pipeline; One end of the pure water outlet pipeline is connected with the pure water outlet, and the other end is a user water outlet.

4. The water purification system of claim 3, wherein The water purification system further comprises a pressure sensor, and the pressure sensor is arranged on the pure water outlet pipeline.

5. A control method of a water purification system, the water purification system comprising a reverse osmosis membrane filter element, the reverse osmosis membrane filter element comprising a membrane shell, a center pipe and a reverse osmosis membrane, the center pipe being arranged in the membrane shell, one end of the center pipe being closed, the other end of the center pipe being open to form a pure water outlet, a membrane pure water outlet being formed in the wall of the center pipe; the reverse osmosis membrane is arranged around the center pipe, two end faces of the reverse osmosis membrane form a raw water inlet end face and a wastewater outlet end face respectively, and a raw water cavity is formed between the circumferential surface of the reverse osmosis membrane and the membrane shell; A driving water pipe is arranged in the center pipe, one end of the driving water pipe abuts against the top wall of the center pipe, and the other end of the driving water pipe is provided with a first driving water outlet, and a second driving water outlet is formed in the wall of the driving water pipe and communicates with the center pipe; A slidable piston is arranged in the cavity between the center pipe and the driving water pipe, and the piston is arranged between the membrane pure water outlet and the second driving water outlet; The reverse osmosis membrane filter element further comprises an adapter, the adapter is arranged between the inner wall of the membrane shell and the outer wall of the center pipe, one side of the adapter and the outer wall of the center pipe form a wastewater cavity and a wastewater outlet; the other side of the adapter and the inner wall of the membrane shell form a raw water inlet, and the raw water inlet and the raw water inlet end face communicate through the raw water cavity; The water purification system further comprises a first water inlet pipeline, a second water inlet pipeline, a wastewater outlet pipeline and a pure water outlet pipeline; One end of the first water inlet pipeline is connected with a water source, and the other end of the first water inlet pipeline is connected with the raw water inlet, a first on-off valve and a booster pump are arranged on the first water inlet pipeline; One end of the second water inlet pipeline is connected with the first driving water outlet, and the other end of the second water inlet pipeline is connected with the water source, a second on-off valve is arranged on the second water inlet pipeline; One end of the wastewater outlet pipeline is connected with the wastewater outlet, and the other end of the wastewater outlet pipeline is a wastewater outlet of the water purification system; The water purification system further comprises a driving outlet pipeline, one end of the driving outlet pipeline is arranged between the second on-off valve and the first driving water outlet, and the other end of the driving outlet pipeline is connected with the wastewater outlet of the water purification system, and a third on-off valve is arranged on the driving outlet pipeline; One end of the pure water outlet pipeline is connected with the pure water outlet, and the other end of the pure water outlet pipeline is a user water outlet. characterized in that The control method comprises: When the user water outlet is closed, the piston is controlled to move upward; When the piston reaches a first preset position, the piston is controlled to move downward.

6. The control method of the water purification system according to claim 5, characterized by, The step of "controlling the piston to move upward" specifically comprises: keeping the first on-off valve and the booster pump in an open state, and keeping the second on-off valve in a closed state; opening the third on-off valve.

7. The control method of the water purification system according to claim 5, characterized by, The water purification system further comprises a pressure sensor arranged on the pure water outlet pipeline; the step of "controlling the piston to move downward when the piston reaches the first preset position" further comprises: controlling the piston to move downward when the piston reaches the first preset position and the pressure value at the pressure sensor is greater than a preset pressure value.

8. The control method of the water purification system according to claim 7, characterized by, The step of "controlling the piston to move downward when the piston reaches the first preset position and the pressure value at the pressure sensor is greater than a preset pressure value" specifically comprises: closing the first on-off valve and the booster pump when the piston reaches the first preset position and the pressure value at the pressure sensor is greater than the preset pressure value; closing the third on-off valve; opening the second on-off valve.

9. The control method of the water purification system according to claim 8, characterized by, After the step of "controlling the piston to move downward when the piston reaches the first preset position and the pressure value at the pressure sensor is greater than a preset pressure value", the control method comprises: closing the second on-off valve when the piston reaches a second preset position.

10. A water purifier characterized by comprising: The water purifier comprises the water purification system of any one of claims 3-4, and is arranged to be capable of performing the control method of the water purification system of any one of claims 5-9.

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