A water purification apparatus

Abstract

The utility model belongs to water treatment technical field discloses a kind of water purification equipment. Water purification equipment includes filter assembly, pressure water storage container and flushing waterway component, the filter assembly includes reverse osmosis membrane filter element and filter outlet;Pressure water storage container is used to store pure water;The flushing waterway component includes water flow channel and flushing flow channel, the water flow channel can be communicated the filter outlet with the pressure water storage container, the flushing flow channel can selectively communicate the filter outlet with the inlet of reverse osmosis membrane filter element or communicate the pressure water storage container with the inlet of reverse osmosis membrane filter element when flushing the reverse osmosis membrane filter element. The water purification equipment can successively carry out mixed water flushing and pure water flushing, the quantity demand of pure water flushing is less, flushing effect is good, it is favorable to shorten flushing time, to reduce overall size and cost.

Description

Technical Field

[0001] This utility model relates to the field of water treatment technology, and in particular to a water purification device. Background Technology

[0002] Reverse osmosis water purifiers are devices that primarily use the reverse osmosis principle for water treatment. After a period of use, the reverse osmosis membrane needs to be flushed to avoid affecting the filtration effect during subsequent use.

[0003] Currently, there are generally two methods for flushing reverse osmosis membranes. One method is to use pure water for flushing. However, pure water is used in large quantities, and due to the limited volume of the pressure tank, the amount of pure water may be insufficient, resulting in poor flushing effect. In addition, it is necessary to wait for a certain amount of pure water to be prepared before flushing, which takes a long time. The other method is to use pure water mixed with raw water or purified water for flushing. Although the waiting time is short, the control effect on TDS (Total Dissolved Solids) value is poor, and the TDS value of the first cup of water may increase after the water purifier is restarted. Utility Model Content

[0004] The purpose of this invention is to provide a water purification device to solve the problems of long pure water rinsing time and poor TDS control effect of mixed water rinsing.

[0005] To achieve this objective, the present invention adopts the following technical solution:

[0006] A water purification device, comprising:

[0007] A filtration assembly, the filtration assembly including a reverse osmosis membrane filter element and a filtration outlet;

[0008] Pressure water storage container, used for storing pure water;

[0009] A flushing water circuit assembly includes a water passage and a flushing channel. The water passage connects the filter outlet and the pressure water storage container. The flushing channel can selectively connect the filter outlet and the inlet of the reverse osmosis membrane filter element or connect the pressure water storage container and the inlet of the reverse osmosis membrane filter element when flushing the reverse osmosis membrane filter element.

[0010] As an optional solution for the above-mentioned water purification equipment, the flushing channel includes:

[0011] The first flushing branch has its inlet end connected to the filter outlet or the water flow channel, and its outlet end is connected to the inlet of the reverse osmosis membrane filter element.

[0012] The second flushing branch has its inlet end connected to the pressure water storage container or the water flow channel, and its outlet end connected to the inlet of the first flushing branch or the reverse osmosis membrane filter element.

[0013] As an optional solution for the above-mentioned water purification equipment, the pressure water storage container includes a water passage hole, the water passage channel is connected to the water passage hole, the inlet end of the first flushing branch and the inlet end of the second flushing branch are both connected to the water passage channel, and the water flows in the direction of the water flow in the water passage channel toward the pressure water storage container, and the inlet end of the second flushing branch is located downstream of the inlet end of the first flushing branch.

[0014] As an optional solution for the above-mentioned water purification equipment, a water storage check valve is provided on the water flow channel. The water storage check valve is located between the inlet end of the first flushing branch and the inlet end of the second flushing branch. The water storage check valve allows water in the water flow channel to flow to the pressure water storage container.

[0015] As an alternative to the above-mentioned water purification equipment, the outlet end of the second flushing branch is connected to the first flushing branch, and a first switching valve is provided on the first flushing branch, the first switching valve being located upstream of the outlet end of the second flushing branch.

[0016] And / or, a second switching valve is provided on the second flushing branch.

[0017] As an optional solution for the above-mentioned water purification equipment, the water purification equipment further includes a diversion component, which is used to adjust the flow rate in the flushing water circuit component so that the filter outlet can simultaneously supply water to the pressure storage container and the inlet of the reverse osmosis membrane filter element through the flushing water circuit component.

[0018] As an optional solution for the above-mentioned water purification equipment, the diversion component includes a flushing booster pump, and the flushing booster pump is provided on the water passage and / or the flushing passage.

[0019] As an optional solution for the above-mentioned water purification equipment, the water purification equipment further includes a pure water flow channel, which is connected to the filter outlet. A high-pressure switch is installed on the pure water flow channel, and the high-pressure switch is communicatively connected to the flushing water circuit assembly.

[0020] As an optional solution for the above-mentioned water purification equipment, the pure water flow channel is equipped with a third switching valve and / or a pure water one-way valve.

[0021] As an optional solution for the above-mentioned water purification equipment, the filtration assembly further includes a pre-filter element, the outlet of which is connected to the inlet of the reverse osmosis membrane filter element, and the water purification equipment further includes a purified water flow channel, which is connected to the outlet of the pre-filter element.

[0022] The beneficial effects of this utility model are:

[0023] The water purification equipment provided by this utility model can perform mixed water rinsing and pure water rinsing sequentially. The first rinsing with mixed water helps reduce impurities at the reverse osmosis membrane and lowers the TDS values ​​before and after the reverse osmosis membrane. The second rinsing with pure water has a good rinsing effect. After rinsing, both the water before and after the reverse osmosis membrane is pure water, which can prevent ion penetration in standby mode and help maintain the TDS value of the water after the reverse osmosis membrane for a longer period of time, thus solving the problem of high TDS value of the "first cup water". In addition, the pure water is supplied from the filter outlet during mixed water rinsing, so there is no need to use the pure water stored in the pressure storage container, which does not reduce the water volume during pure water rinsing and ensures the pure water rinsing effect. Moreover, the pure water rinsing is a secondary rinsing, which requires a low total rinsing water volume and helps to reduce the size of the pressure storage container, thereby reducing the overall size and cost of the machine.

[0024] The water purification equipment also includes a diversion component, which is used to regulate the flow rate in the flushing water circuit component so that the pure water at the filter outlet can be diverted. One pure water flows back to the first filter channel to mix with the purified water to flush the reverse osmosis membrane filter element; the other pure water enters the pressure storage container through the water flow channel to replenish the pressure storage container.

[0025] The flushing method for water purification equipment provided by this utility model can be applied to the above-mentioned water purification equipment, which can improve the flushing effect of reverse osmosis membrane filter element and help to shorten the flushing time. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the water purification equipment provided in Embodiment 1 of this utility model during the preparation of pure water;

[0027] Figure 2 This is a schematic diagram of the structure of the water purification equipment provided in Embodiment 1 of this utility model when replenishing water into the pressure water storage container;

[0028] Figure 3 This is a schematic diagram of the water purification equipment provided in Embodiment 1 of this utility model during mixed water rinsing;

[0029] Figure 4 This is a schematic diagram of the water purification equipment provided in Embodiment 1 of this utility model during pure water rinsing;

[0030] Figure 5This is a schematic diagram of the water purification equipment provided in Embodiment 2 of this utility model when replenishing water into the pressure storage container and performing mixed water flushing.

[0031] In the picture:

[0032] 10. Inlet water channel; 11. Inlet water valve; 12. Inlet water TDS value detection element; 20. Filter assembly; 21. Pre-filter cartridge; 22. Reverse osmosis membrane cartridge; 23. First filtration channel; 24. Second filtration channel; 25. Filter check valve; 26. Third filtration channel; 30. Pressure storage container; 41. Water flow channel; 42. Flushing channel; 421. First flushing branch; 422. Second flushing branch; 43. 44. Second switch valve; 45. First switch valve; 46. Flushing check valve; 50. Booster pump; 60. Pure water flow channel; 61. Pure water check valve; 62. High pressure switch; 63. Outlet flow rate detection device; 64. Third switch valve; 65. Pure water TDS value detection device; 70. Wastewater flow channel; 71. Fourth switch valve; 80. Clean water flow channel; 81. Clean water flow rate detection device; 82. Fifth switch valve. Detailed Implementation

[0033] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0034] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0035] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0036] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0037] Example 1

[0038] This embodiment provides a water purification device, such as... Figure 1 As shown, the system includes a filter assembly 20, an inlet water channel 10, and a pure water channel 60. The filter assembly 20 includes a filter inlet and a filter outlet. The inlet water channel 10 is connected to the filter inlet, and the pure water channel 60 is connected to the filter outlet. When the water purification equipment is working, raw water enters the filter assembly 20 through the inlet water channel 10, and the pure water obtained after filtration by the filter assembly 20 flows out through the pure water channel 60 for use.

[0039] Optionally, the pure water channel 60 can be connected to a faucet for user convenience; the pure water channel 60 can also be connected to water-using equipment, such as a water dispenser.

[0040] Optionally, an inlet valve 11 is provided on the inlet channel 10 to control the inlet flow of the water purification equipment.

[0041] Optionally, the inlet channel 10 is also equipped with an inlet TDS value detection element 12 to detect the TDS value of the raw water.

[0042] In this embodiment, the filtration assembly 20 includes a pre-filter 21 and a reverse osmosis membrane filter 22, which are connected to each other to perform at least two stages of filtration on the raw water.

[0043] In some embodiments, the pre-filter 21 includes a PCB filter and an activated carbon filter. The PCB filter is connected to the inlet of the water inlet channel 10 and the inlet of the reverse osmosis membrane filter 22, respectively. The outlet of the reverse osmosis membrane filter 22 is connected to the activated carbon filter. The outlet of the activated carbon filter forms a filter outlet, which is connected to the pure water channel 60.

[0044] When the water purification equipment is not in use, the TDS value is higher on one side of the reverse osmosis membrane than on the other side, which contains filtered pure water with a lower TDS value. During standby, because there is no pressure for reverse osmosis in the flow channel, ions on both sides of the membrane will permeate from the side with higher concentration to the side with lower concentration through osmosis, causing the TDS value of the water after the membrane to increase. This results in an increased TDS value in the "first cup of water" when the water purification equipment is restarted, affecting its potability.

[0045] In existing technologies, rinsing is typically achieved by recirculating filtered pure water and mixing it with water from the inlet side of the reverse osmosis membrane cartridge. However, since the mixed water only contains a portion of pure water, neither the inlet nor outlet of the reverse osmosis membrane remains pure after rinsing, resulting in continued permeation and a rapid increase in the TDS value of the water downstream of the membrane, leading to the problem of a high TDS value in the "first cup water." Some solutions utilize pressure storage containers to store pure water for rinsing. While this helps maintain the TDS value downstream of the membrane after rinsing, the size of these containers is generally small due to overall system limitations, resulting in a limited volume of pure water. Using less pure water leads to poor rinsing effectiveness, and impurities will still remain in the reverse osmosis membrane cartridge. Using large amounts of pure water for rinsing either increases the overall system size and cost or requires multiple purification processes for rinsing, resulting in a prolonged rinsing time.

[0046] To address the aforementioned issues, in this embodiment, the water purification equipment further includes a pressure water storage container 30 and a flushing water path assembly. The pressure water storage container 30 stores pure water for flushing the reverse osmosis membrane filter element 22. The flushing water path assembly includes a water passage 41 and a flushing passage 42. The water passage 41 connects the filter outlet and the pressure water storage container 30, while the flushing passage 42 can selectively connect the filter outlet and the inlet of the reverse osmosis membrane filter element 22, or connect the pressure water storage container 30 and the inlet of the reverse osmosis membrane filter element 22, during flushing.

[0047] Optionally, the pressure water storage container 30 can be a pressure tank. It should be noted that the pressure water storage container 30 is an existing structure, and the pressure water storage container 30 in this embodiment can adopt any structure of pressure water storage container in the prior art.

[0048] Before rinsing the reverse osmosis membrane filter element 22, the water flow channel 41 connects the filter outlet and the pressure water storage container 30, so that the pure water obtained after filtration enters the pressure water storage container 30 for storage, which facilitates subsequent pure water rinsing and ensures a certain amount of pure water rinsing.

[0049] When flushing the reverse osmosis membrane filter element 22, the flushing channel 42 first connects the filter outlet and the inlet of the reverse osmosis membrane filter element 22, allowing the pure water filtered by the filter assembly 20 to flow back to the front of the reverse osmosis membrane filter element 22 and mix with the purified water filtered by the pre-filter element 21, so as to flush the reverse osmosis membrane filter element 22 with the mixed water. Afterwards, the flushing channel 42 connects the pressure water storage container 30 and the inlet of the reverse osmosis membrane filter element 22, so as to flush the reverse osmosis membrane filter element 22 with the pure water stored in the pressure water storage container 30. The aforementioned equipment allows for sequential rinsing with mixed water and pure water. The initial rinsing with mixed water helps reduce impurities at the reverse osmosis membrane, lowering the TDS values ​​before and after the membrane. The subsequent secondary rinsing with pure water provides excellent rinsing results. After rinsing, both the water before and after the reverse osmosis membrane is pure water, preventing ion penetration during standby and maintaining a higher TDS value in the downstream water for a longer period, thus addressing the issue of high TDS values ​​in the initial water sample. Furthermore, during mixed water rinsing, pure water is supplied from the filter outlet, eliminating the need to use the pure water stored in the pressure storage container 30, ensuring the same water volume for pure water rinsing and maintaining its effectiveness. Since pure water rinsing is a secondary process, the total rinsing water volume requirement is low, allowing for a smaller pressure storage container, thus reducing the overall size and cost of the system.

[0050] like Figure 2 As shown, in some embodiments, the pressure water storage container 30 is provided with a water passage hole, which is connected to the water flow channel 41. The flushing channel 42 is also connected to the water flow channel 41, so that both the inlet and outlet water of the pressure water storage container 30 passes through the water passage hole and the water flow channel 41, simplifying the water circuit structure and reducing costs. When pure water needs to be added to the pressure water storage container 30, pure water enters the pressure water storage container 30 through the water flow channel 41 and the water passage hole. When the pressure water storage container 30 needs to discharge water, the pure water in the pressure water storage container 30 enters the water flow channel 41 through the water passage hole and is flushed through the water flow channel 41 and the flushing channel 42.

[0051] Pure water can enter and exit the pressure water storage container 30 through a water passage, eliminating the need for additional openings on the pressure water storage container 30 to ensure its strength and meet the high pressure requirements of the pure water inside.

[0052] To achieve both mixed water rinsing and pure water rinsing, in some embodiments, such as Figure 3 and Figure 4 As shown, the flushing channel 42 includes a first flushing branch 421 and a second flushing branch 422. The inlet end of the first flushing branch 421 is connected to the water channel 41, and the outlet end of the first flushing branch 421 is connected to the inlet of the reverse osmosis membrane filter element 22. The inlet end of the second flushing branch 422 is connected to the water channel 41, and the outlet end of the second flushing branch 422 is connected to the first flushing branch 421.

[0053] like Figure 3 As shown, during mixed water flushing, the pure water filtered by the filter assembly 20 flows through the water passage 41 and the first flushing branch 421 in sequence and then flows back to the inlet of the reverse osmosis membrane filter element 22, thereby mixing with the purified water filtered by the pre-filter element 21 to flush the reverse osmosis membrane filter element 22. The flushed wastewater is discharged through the wastewater passage 70 connected to the reverse osmosis membrane filter element 22. The filtered water flows out of the filter outlet after passing through the activated carbon filter element of the pre-filter element 21 and re-enters the water passage 41 to achieve circulating flushing.

[0054] like Figure 4 As shown, when pure water rinsing is performed, the inlet valve 11 is closed, stopping the flow of raw water to the filter assembly 20. The pressure storage container 30 provides pure water, which flows back to the inlet of the reverse osmosis membrane filter element 22 through the water flow channel 41, the second rinsing branch 422 and the first rinsing branch 421 in sequence, thereby rinsing the reverse osmosis membrane filter element 22 with pure water. The wastewater after rinsing is discharged through the wastewater flow channel 70.

[0055] Optionally, a fourth switch valve 71 is provided on the wastewater flow channel 70 to control the opening and closing of the wastewater flow channel 70.

[0056] Both the first flushing branch 421 and the second flushing branch 422 are connected to the water flow channel 41. On the one hand, this allows part of the water flow channel 41 to be used for both mixed water flushing and pure water flushing, simplifying the water circuit structure and reducing costs. On the other hand, it enables the use of pure water filtered in real time by the filter assembly 20 for mixed flushing, eliminating the need to use the pure water in the pressure storage container 30, thus ensuring sufficient pure water flushing volume.

[0057] In some other embodiments, the inlet of the first flushing branch 421 can be directly connected to the filter outlet, for example, a multi-way valve is provided at the filter outlet, one of the valve ports of which is connected to the first flushing branch 421.

[0058] In some other embodiments, the inlet end of the second flushing branch 422 may be connected to the pressure water storage container 30. Optionally, a multi-port valve is provided at the water passage on the pressure water storage container 30, one valve port being connected to the water flow channel 41 and the other valve port being connected to the second flushing branch 422; or, an additional opening is provided on the pressure water storage container 30 to connect to the second flushing branch 422, the opening being used for the outflow of pure water from the pressure water storage container 30.

[0059] To facilitate the above-mentioned water path connection, in some embodiments, the inlet end of the second flushing branch 422 is located downstream of the inlet end of the first flushing branch 421 in the direction of water flow from the water passage 41 to the pressure storage container 30. When performing mixed water flushing, the pure water flowing out of the filter outlet can first pass through the inlet end of the first flushing branch 421 before entering the water passage 41, allowing it to return via the first flushing branch 421 without needing to pass through the second flushing branch 422. When performing pure water flushing, the water flowing out of the pressure storage container 30 passes through the second flushing branch 422 after entering the water passage 41, allowing it to quickly return for pure water flushing.

[0060] In some embodiments, a water storage check valve 43 is provided on the water flow channel 41. The water storage check valve 43 is located between the inlet end of the first flushing branch 421 and the inlet end of the second flushing branch 422. The water storage check valve 43 allows water in the water flow channel 41 to flow to the pressure water storage container 30. By providing the water storage check valve 43, during pure water flushing, water in the water flow channel 41 can be prevented from flowing directly into the first flushing branch 421 or flowing back to the filter outlet, thereby ensuring a stable and reliable water flow path within the water purification equipment.

[0061] In some embodiments, a first switching valve 45 is provided on the first flushing branch 421, and a second switching valve 44 is provided on the second flushing branch 422. The first switching valve 45 is located upstream of the outlet end of the second flushing branch 422. During pure water flushing, the first switching valve 45 is closed, and the second switching valve 44 is opened. Pure water enters the second flushing branch 422 through the water flow channel 41, passes through the first switching valve 45, and then enters the first flushing branch 421 so as to return to the inlet of the reverse osmosis membrane filter element 22.

[0062] In some embodiments, a flushing check valve 46 is provided on the first flushing branch 421. The flushing check valve 46 can prevent the purified water after being filtered by the pre-filter 21 from flowing into the first flushing branch 421 to prevent backflow.

[0063] In some embodiments, the filter assembly 20 further includes a first filter channel 23, a second filter channel 24, and a third filter channel 26. The first filter channel 23 connects the outlet of the PCB filter element and the inlet of the reverse osmosis membrane filter element 22. The second filter channel 24 connects the outlet of the reverse osmosis membrane filter element 22 and the inlet of the activated carbon filter element. The third filter channel 26 connects the outlet of the activated carbon filter element and the filter outlet. The rinsing channel 42 is connected to the first filter channel 23. Specifically, the first rinsing branch 421 is connected to the first filter channel 23 to achieve a rinsing function.

[0064] Optionally, a booster pump 50 is provided on the first filter channel 23. The booster pump 50 is located at the connection position between the first flushing branch 421 and the first filter channel 23 and between the reverse osmosis membrane filter element 22, so as to provide power for the backflow flushing water and improve the flushing effect.

[0065] In some other embodiments, the third filter channel 26 may not be provided, and the outlet of the activated carbon filter element may be directly connected to the pure water channel 60 and the water passage channel 41 as the filter outlet.

[0066] In some embodiments, a filter check valve 25 is provided on the second filter channel 24 to prevent water backflow in the second filter channel 24.

[0067] In some embodiments, a third switching valve 64 is provided on the pure water flow channel 60, which is used to control the opening and closing of the pure water flow channel 60.

[0068] In some embodiments, a pure water check valve 61 is provided on the pure water flow channel 60. The pure water check valve 61 allows the water in the pure water flow channel 60 to flow towards the outlet direction, preventing pure water backflow.

[0069] Optionally, the pure water check valve 61 is located upstream of the third switching valve 64 to increase the effective length of the pure water check valve 61 to prevent backflow of water in the pure water flow channel 60 and improve the backflow prevention effect.

[0070] In some implementations, a high-pressure switch 62 is installed on the pure water flow channel 60. The high-pressure switch 62 can sense the change in water pressure inside the pure water flow channel 60 and communicate with the flushing water circuit components. In order to adjust the connection state of the flushing water circuit components according to the change in water pressure inside the pure water flow channel 60, the automatic storage of water into the pressure water storage container 30 and the performance of mixed water flushing and pure water flushing can be realized.

[0071] Optionally, the high-pressure switch 62 and the flushing water circuit assembly are connected via a control component.

[0072] When adding pure water to the pressure storage container 30, the second switch valve 44, the first switch valve 45, and the third switch valve 64 are all closed, the booster pump 50 is started, and the inlet valve 11 is opened. The pure water obtained after the raw water is filtered by the filter assembly 20 enters the pressure storage container 30 through the water passage 41. As the water volume in the pressure storage container 30 increases, the water pressure in the pressure storage container 30 increases, resulting in an increase in the water pressure in the water passage 41. Since the pure water passage 60 and the water passage 41 are connected, the water pressure in the pure water passage 60 increases. When the water pressure in the pure water channel 60 reaches the set pressure value, the high-pressure switch 62 is triggered and sends a signal to the control component. The control component controls the first switching valve 45 to open, resulting in lower pressure in the first flushing branch 421. The pure water at the filter outlet flows towards the direction of lower pressure, thus returning through the first flushing branch 421. At this time, the inlet valve 11 is open to allow the returning pure water to mix with the purified water filtered by the PCB filter element, thereby flushing the reverse osmosis membrane filter element 22. Meanwhile, the cooperation of the second switching valve 44 and the water storage check valve 43 prevents the pure water in the pressure storage container 30 from flowing back.

[0073] By setting a high-pressure switch 62, water intake can be automatically stopped when the pressure water storage container 30 is full. There is no need to install a water level detection device in the pressure water storage container 30. The structure is simple and the detection result is accurate. It can avoid safety accidents caused by excessive pressure in the pressure water storage container 30 or the water flow channel 41, and ensure safe use.

[0074] Optionally, the high-pressure switch 62 is located between the pure water check valve 61 and the third switch valve 64 to ensure that the water pressure value detected by the high-pressure switch 62 is related to the water pressure value in the pressure storage container 30.

[0075] In some embodiments, the pure water flow channel 60 is also provided with an outlet flow rate detection element 63, which is used to detect the outlet flow rate of pure water in order to realize the quantitative supply of pure water.

[0076] In some embodiments, the pure water channel 60 may be connected to water-using equipment such as a pipeline machine to supply water to other equipment.

[0077] In some embodiments, a pure water TDS value detection element 65 is also provided on the pure water flow channel 60 to detect the TDS value of pure water, and can stop water flow in time when the TDS value of pure water does not meet the requirements, so as to ensure the drinking quality of pure water.

[0078] In some embodiments, a purified water channel 80 is connected to the first filter channel 23, and the purified water channel 80 is used to provide purified water to the user. Optionally, a purified water flow detection element 81 is provided on the purified water channel 80 to detect the output purified water flow rate.

[0079] Optionally, a fifth switch valve 82 is provided on the water purification channel 80 to control the opening and closing of the water purification channel 80.

[0080] This embodiment also provides a flushing method for a water purification device, used in the aforementioned water purification device, the flushing method for the water purification device including:

[0081] Step S11: The filter assembly 20 prepares pure water to be introduced into the pressure water storage container 30.

[0082] Specifically, the inlet valve 11 is opened, the booster pump 50 is started, and the first switch valve 45, the second switch valve 44, and the third switch valve 64 are closed at the same time. Tap water passes through the PCB filter element, the booster pump 50, the reverse osmosis membrane filter element 22, and the activated carbon filter element in sequence to obtain pure water. The pure water enters the pressure storage container 30 through the water flow channel 41.

[0083] Step S12: The filter assembly 20 prepares pure water, and the prepared pure water is refluxed and mixed with the water at the inlet end of the reverse osmosis membrane filter element 22 to rinse the reverse osmosis membrane filter element 22.

[0084] Optionally, as the amount of pure water in the pressure water storage container 30 increases, the water pressure in the end of the water flow channel 41, which connects to the pure water flow channel 60, increases. When the water pressure in the pure water flow channel 60 increases to a set pressure value, the high-pressure switch 62 is triggered. After receiving the triggering of the high-pressure switch 62, the control component determines that the pressure water storage container 30 is full of pure water.

[0085] After the pressure storage container 30 is full, the inlet valve 11 and the first switch valve 45 are opened, the booster pump 50 is started, and the second switch valve 44 and the third switch valve 64 are closed at the same time. Tap water passes through the PCB filter element, the booster pump 50, the reverse osmosis membrane filter element 22, and the activated carbon filter element in sequence to obtain pure water. The pure water enters the first flushing branch 421 through the water flow channel 41 to return to the front of the booster pump 50, thereby realizing the mixed water flushing of the reverse osmosis membrane filter element 22.

[0086] It should be noted that, due to the large volume of pure water in the pressure water storage container 30 and the high water pressure within it, the resistance to pure water entering the pressure water storage container 30 is high, while the resistance in the first flushing branch 421 is low. This causes the pure water to automatically flow into the first flushing branch 421, where the pressure is lower, when it enters the water passage 41. Furthermore, by setting a one-way valve 43, the pure water in the pressure water storage container 30 will not flow backward through the water passage 41, thus preventing the pure water in the pressure water storage container 30 from flowing out.

[0087] Optionally, the mixed rinsing time can be set as a first duration. The first duration can be a fixed value, or it can be set by the user according to the user's needs, or the specific duration can be intelligently set according to the rinsing frequency.

[0088] In some embodiments, the inlet valve 11 and the booster pump 50 may be closed between steps S11 and S12 and maintained for a second duration to stabilize the water flow in the flow path of the water purification equipment, thereby avoiding direct flushing with mixed water which would cause turbulence in the flow path and affect the normal operation of the water purification equipment.

[0089] Optionally, the second duration can be 5 min to 15 min, for example 5 min, 6 min, 7 min, 8 min, 9 min, 10 min, 11 min, 12 min, 13 min, 14 min, or 15 min.

[0090] Step S13: The filter assembly 20 stops producing pure water, and the pure water in the pressure storage container 30 flows to the inlet end of the reverse osmosis membrane filter element 22 to rinse the reverse osmosis membrane filter element 22.

[0091] After the mixed rinsing is completed, a pure water rinsing is performed. Specifically, the inlet valve 11, the first switch valve 45 and the third switch valve 64 are closed, and the second switch valve 44 is opened, so that the pure water in the pressure water storage container 30 can flow sequentially through the second rinsing branch 422 and the first rinsing branch 421 to the first filter channel 23, so as to rinse the reverse osmosis membrane filter element 22 with pure water.

[0092] In summary, in this embodiment, when rinsing the reverse osmosis membrane filter element 22, a mixed water rinse is performed first, followed by a pure water rinse. This requires a small amount of pure water for rinsing, eliminates the need for repeated preparation of pure water, and shortens the total rinsing time. The pure water used for the mixed water rinse is provided by the filter outlet, meaning that this portion of pure water is prepared in real time and does not require the use of pure water stored in the pressure storage container 30, which helps ensure the amount of pure water used for rinsing. Using pure water for the post-rinse helps maintain a low TDS value of the water behind the reverse osmosis membrane for a long time, thus solving the problem of a high TDS value in the "first cup water".

[0093] Example 2

[0094] This embodiment provides a water purification device, which is largely the same as that in Embodiment 1, except that, as follows: Figure 5 As shown, the flushing water circuit assembly can connect the filter outlet to the inlet of the reverse osmosis membrane filter element 22 and the pressure water storage container 30 at the same time, so as to replenish pure water into the pressure water storage container 30 while flushing the reverse osmosis membrane filter element 22 with mixed water, thereby improving flushing efficiency and shortening flushing time.

[0095] Specifically, the water purification equipment also includes a diversion component, which is used to adjust the flow rate in the flushing water circuit component so that the pure water at the filter outlet can be diverted. One pure water flows back to the first filter channel 23 to mix with the purified water to flush the reverse osmosis membrane filter element 22; the other pure water enters the pressure storage container 30 through the water flow channel 41 to replenish the pressure storage container 30.

[0096] It is understandable that the water pressure in the pressure storage container 30 will gradually increase as the water volume increases, resulting in increased water replenishment resistance. In order to ensure that some pure water can enter the pressure storage container 30, the diversion component includes a flushing booster pump 50, and the flushing booster pump 50 is installed on the water flow channel 41 and / or the flushing flow channel 42.

[0097] Optionally, flushing booster pumps 50 are installed on both the water flow channel 41 and the first flushing branch 421. The flushing booster pump 50 located on the water flow channel 41 is positioned downstream of the water storage check valve 43 to increase the driving force for the water entering the pressure water storage container 30.

[0098] In some other embodiments, the diversion assembly may include a diversion valve with its inlet connected to the filter outlet, one outlet connected to the water passage 41, another outlet connected to the first flushing branch 421, and yet another outlet connected to the pure water passage 60.

[0099] This embodiment also provides a flushing method for a water purification device, applied to the aforementioned water purification device, specifically including:

[0100] Step S21: The filter assembly 20 prepares pure water. Part of the prepared pure water is returned and mixed with the water at the inlet of the reverse osmosis membrane filter element 22 to rinse the reverse osmosis membrane filter element 22. Part of the pure water flows into the pressure storage container 30.

[0101] Specifically, the inlet valve 11 and the first switch valve 45 are opened, the booster pump 50 is started, and the second switch valve 44 and the third switch valve 64 are closed. Tap water passes through the PCB filter element, the booster pump 50, the reverse osmosis membrane filter element 22, and the activated carbon filter element in sequence to obtain pure water. Under the action of the diversion component, the pure water is divided into two paths. One path of pure water enters the pressure storage container 30 through the water flow channel 41 to replenish the pressure storage container 30; the other path of pure water flows back to the first filtration channel 23 through the first flushing branch 421 to mix with the purified water and achieve mixed flushing of the reverse osmosis membrane filter element 22.

[0102] Adding pure water to the pressure water storage container 30 while mixing and rinsing can reduce rinsing waiting time and improve rinsing efficiency.

[0103] Optionally, during mixed rinsing, the flow rate of pure water entering the pressure storage container 30 gradually decreases, while the flow rate of pure water returning to the inlet of the reverse osmosis membrane filter element 22 gradually increases. As mixed rinsing progresses, the water volume in the pressure storage container 30 gradually increases, which can reduce the flow rate of pure water flowing into the pressure storage container 30, thereby increasing the flow rate of pure water returning to the container. This gradually increases the proportion of pure water in the mixed water, which is beneficial for improving the rinsing effect.

[0104] Optionally, in step S21, the duration of the mixed rinsing can be equal to the time required for the pressure water storage container 30 to be filled with pure water, so that pure water rinsing can begin after the pressure water storage container 30 is filled with water.

[0105] In some other embodiments, the duration of the mixed rinsing can be longer than the time required for the pressure water storage container 30 to be filled with pure water, so as to increase the duration of the mixed rinsing and improve the rinsing effect.

[0106] Step S22: The filter assembly 20 stops producing pure water, and the pure water in the pressure storage container 30 flows to the inlet of the reverse osmosis membrane filter element 22 to rinse the reverse osmosis membrane filter element 22.

[0107] Optionally, as the amount of pure water in the pressure water storage container 30 increases, the water pressure in the end of the water flow channel 41, which connects to the pure water flow channel 60, increases. When the water pressure in the pure water flow channel 60 increases to a set pressure value, the high-pressure switch 62 is triggered. After receiving the triggering of the high-pressure switch 62, the control component determines that the pressure water storage container 30 is full of pure water.

[0108] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A water purification device, characterized in that, include: A filter assembly (20), the filter assembly (20) including a reverse osmosis membrane filter element (22) and a filter outlet; Pressure water storage container (30) for storing pure water; The flushing water circuit assembly includes a water passage (41) and a flushing passage (42). The water passage (41) can connect the filter outlet and the pressure water storage container (30). The flushing passage (42) can selectively connect the filter outlet and the inlet of the reverse osmosis membrane filter element (22) or connect the pressure water storage container (30) and the inlet of the reverse osmosis membrane filter element (22) when flushing the reverse osmosis membrane filter element (22).

2. The water purification equipment according to claim 1, characterized in that, The flushing channel (42) includes: The first flushing branch (421) has its inlet end connected to the filter outlet or the water flow channel (41), and its outlet end is connected to the inlet of the reverse osmosis membrane filter element (22). The second flushing branch (422) has its inlet end connected to the pressure water storage container (30) or the water flow channel (41), and its outlet end connected to the inlet of the first flushing branch (421) or the reverse osmosis membrane filter element (22).

3. The water purification equipment according to claim 2, characterized in that, The pressure water storage container (30) includes a water passage hole, and the water passage channel (41) is connected to the water passage hole. The inlet end of the first flushing branch (421) and the inlet end of the second flushing branch (422) are both connected to the water passage channel (41), and the water flows in the direction of the water passage channel (41) toward the pressure water storage container (30). The inlet end of the second flushing branch (422) is located downstream of the inlet end of the first flushing branch (421).

4. The water purification equipment according to claim 3, characterized in that, A water storage check valve (43) is provided on the water passage (41). The water storage check valve (43) is located between the inlet end of the first flushing branch (421) and the inlet end of the second flushing branch (422). The water storage check valve (43) allows water in the water passage (41) to flow to the pressure water storage container (30).

5. The water purification equipment according to claim 2, characterized in that, The outlet end of the second flushing branch (422) is connected to the first flushing branch (421). A first switching valve (45) is provided on the first flushing branch (421). The first switching valve (45) is located upstream of the outlet end of the second flushing branch (422). And / or, a second switching valve (44) is provided on the second flushing branch (422).

6. The water purification equipment according to any one of claims 1-5, characterized in that, The water purification equipment also includes a diversion component, which is used to adjust the flow rate in the flushing water circuit component so that the filter outlet can simultaneously supply water to the pressure storage container (30) and the inlet of the reverse osmosis membrane filter element (22) through the flushing water circuit component.

7. The water purification equipment according to claim 6, characterized in that, The diversion assembly includes a flushing booster pump, which is provided on the water passage (41) and / or the flushing passage (42).

8. The water purification equipment according to any one of claims 1-5, characterized in that, The water purification equipment also includes a pure water flow channel (60), which is connected to the filter outlet. A high-pressure switch (62) is provided on the pure water flow channel (60), and the high-pressure switch (62) is communicatively connected to the flushing water circuit assembly.

9. The water purification equipment according to claim 8, characterized in that, The pure water flow channel (60) is equipped with a third switching valve (64) and / or a pure water check valve (61).

10. The water purification equipment according to any one of claims 1-5, characterized in that, The filter assembly (20) further includes a pre-filter (21), the outlet of which is connected to the inlet of the reverse osmosis membrane filter (22). The water purification device further includes a water purification channel (80), which is connected to the outlet of the pre-filter (21).

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