Filtering method and filtering system based on a circulation water circuit

Abstract

The application discloses a filtering method based on a circulating water path, which is applied to a filtering system, and the filtering system comprises a raw water branch, a booster device, a water production branch, a waste water discharge branch, a pure water discharge branch, a pure water return branch and a preposition device. When it is judged that the water production branch meets a flushing condition, the filtering system is controlled to perform a flushing operation, and the flushing operation comprises first stage flushing and / or second stage flushing. When it is judged that the water production branch meets a water production condition, the filtering system is controlled to perform first stage water production and second stage water production. It can be seen that the application can provide a multi-stage flushing and water production control mechanism to effectively flush and produce water for the filtering system, significantly improve the intelligent control level of the filtering system, improve the flushing efficiency of the filter core, improve the water production rate of the filtering system, improve the quality of the first cup of water, and avoid waste of water resources.

Description

Technical Field

[0001] This invention relates to the field of water purification technology, and in particular to a filtration method and filtration system based on a circulating water circuit. Background Technology

[0002] With the rapid development of water purification technology, filtration systems using devices such as reverse osmosis membranes are becoming increasingly popular. However, after prolonged use, concentrated wastewater remains inside the reverse osmosis membrane, causing salts or other dissolved solids to adhere to the membrane and reducing its lifespan. Therefore, the filtration system needs to be flushed frequently.

[0003] In practical applications, filtered water or raw water is typically used to flush the wastewater side of the reverse osmosis pressure membrane, and the flushed water is then directly discharged. However, this flushing method results in a large amount of wastewater being discharged during the flushing process, reducing the water production efficiency of the filtration system and wasting water resources.

[0004] Therefore, it is particularly important to provide a filtration method based on a circulating water system to improve rinsing and water production efficiency. Summary of the Invention

[0005] This invention provides a filtration method and apparatus based on a circulating water path, which can provide a multi-stage flushing and water production control mechanism to effectively flush and produce water for the filtration system, significantly improve the intelligent control level of the filtration system, improve the flushing efficiency of the filter element, improve the water production rate of the filtration system, improve the water quality of the first cup, and avoid water waste.

[0006] To address the aforementioned technical problems, the first aspect of this invention discloses a filtration method based on a circulating water path. The method is applied to a filtration system comprising a raw water branch, a booster device, a product water branch, a wastewater discharge branch, and a pure water discharge branch. The product water branch includes a filter inlet, a filter element, a pure water outlet, and a wastewater outlet. A booster device is installed on the raw water branch to generate a water pressure difference. The booster device is located upstream of the product water branch. The filtration system further includes a pure water return branch and a pre-filter, the pre-filter being located upstream of the booster device. The method comprises:

[0007] Determine whether the water production branch meets the flushing conditions;

[0008] When it is determined that the water production branch meets the flushing conditions, the filtration system is controlled to perform a flushing operation, which includes a first-stage flushing and / or a second-stage flushing.

[0009] When the first-stage flushing is performed, the filter system is controlled to perform a first flushing operation for returning pure water generated by the water production branch to the pre-arrangement through the pure water return branch, so as to push the water in the pre-arrangement to the booster arrangement and then input the water production branch to flush the filter element;

[0010] When the second-stage flushing is performed, the filter system is controlled to perform a second flushing operation for opening the waste water discharge branch and pushing the water in the pre-arrangement to the booster arrangement and then input the water production branch to perform a burst flushing on the filter element;

[0011] It is judged whether the water production branch satisfies a water production condition;

[0012] When it is judged that the water production branch satisfies the water production condition, the filter system is controlled to perform a first-stage water production and a second-stage water production;

[0013] When the first-stage water production is performed, the filter system is controlled to perform a first water production operation for controlling the waste water discharge branch to discharge waste water at a smaller than a preset opening degree, so as to discharge the pure water generated by the water production branch through the pure water discharge branch;

[0014] When the second-stage water production is performed, the filter system is controlled to perform a second water production operation for controlling the waste water discharge branch to discharge waste water at the preset opening degree, so as to discharge the pure water generated by the water production branch through the pure water discharge branch.

[0015] As an optional implementation, in the first aspect of the present application, the filter system further comprises a waste water return branch;

[0016] When the first-stage flushing is performed, the method further comprises:

[0017] controlling the waste water return branch to perform a first waste water return operation for returning waste water discharged by the waste water outlet to the booster arrangement and then inputting the water production branch, so as to maintain water quality balance of the filter element; and closing the waste water discharge branch.

[0018] As an optional implementation, in the first aspect of the present application, when the first-stage water production is performed, the method further comprises:

[0019] controlling the waste water return branch to perform a second waste water return operation for controlling the waste water return branch to return waste water discharged by the waste water outlet to the booster arrangement and then input the water production branch, so as to discharge the pure water generated by the water production branch through the pure water discharge branch.

[0020] As an optional implementation, in the first aspect of the present application, the method further comprises:

[0021] When the water production in the first stage is performed, it is determined whether the water production in the first stage is completed, and when it is determined that the water production in the first stage is completed, the water production in the second stage is started;

[0022] The determination of whether the water production in the first stage is completed comprises:

[0023] It is determined whether the duration of the water production in the first stage exceeds a first preset duration, and when it is determined that the duration of the water production in the first stage exceeds the first preset duration, it is determined that the water production in the first stage is completed; or,

[0024] It is determined whether the first water quality value of the wastewater outlet exceeds a first water quality threshold, and when it is determined that the first water quality value of the wastewater outlet exceeds the first water quality threshold, it is determined that the water production in the first stage is completed.

[0025] As an optional implementation, in the first aspect of the present application, the method further comprises:

[0026] When the water production in the first stage or the water production in the second stage is performed, when it is determined that the first water quality value of the wastewater outlet exceeds a second water quality threshold, or when it is determined that the second water quality value of the filter element water inlet exceeds a third water quality threshold, the wastewater backflow branch is controlled to perform a closing operation.

[0027] As an optional implementation, in the first aspect of the present application, the method of determining that the water production branch satisfies the flushing condition comprises:

[0028] It is determined whether the first water quality value of the wastewater outlet exceeds a fourth water quality threshold, and when it is determined that the first water quality value exceeds the fourth water quality threshold, it is determined that the water production branch satisfies the flushing condition; or,

[0029] It is determined whether the third water quality value of the pure water outlet exceeds a fifth water quality threshold, and when it is determined that the third water quality value exceeds the fifth water quality threshold, it is determined that the water production branch satisfies the flushing condition; or,

[0030] It is determined whether the fourth water quality value of the pure water discharge branch exceeds a sixth water quality threshold, and when it is determined that the fourth water quality value exceeds the sixth water quality threshold, it is determined that the water production branch satisfies the flushing condition; or,

[0031] determining whether a time difference between the current time point and a time point at which the water production branch last time ends the flushing exceeds a second preset time length, and when it is determined that the time difference between the current time point and the time point at which the water production branch last time ends the flushing exceeds the second preset time length, it is determined that the water production branch satisfies the flushing condition; or

[0032] determining whether a working time length of the water production branch exceeds a third preset time length, and when it is determined that the working time length of the water production branch exceeds the third preset time length, it is determined that the water production branch satisfies the flushing condition, wherein the working time length includes a single water production working time length or a total time length of the last N times of water production working time lengths; or

[0033] determining whether a water production amount of the water production branch exceeds a preset water amount, and when it is determined that the water production amount of the water production branch exceeds the preset water amount, it is determined that the water production branch satisfies the flushing condition, wherein the water production amount includes a single water production amount or a total water amount of the last N times of water production; or

[0034] determining whether a water production frequency of the water production branch exceeds a preset water production frequency, and when it is determined that the water production frequency of the water production branch exceeds the preset water production frequency, it is determined that the water production branch satisfies the flushing condition, wherein the water production frequency includes a total number of water productions between the current time point and a time point at which the water production branch last time ends the flushing or a total number of water productions in a water production life cycle of the water production branch.

[0035] The second aspect of the present application discloses a filtering system, which comprises a raw water branch, a booster device, a water production branch, a waste water discharge branch and a pure water discharge branch, the water production branch comprises a filter core water inlet, a filter core, a pure water outlet and a waste water outlet, the raw water branch is provided with a booster device, the booster device is used for generating a water pressure difference, the booster device is located upstream of the water production branch, and the filtering system further comprises:

[0036] a pure water backflow branch, the pure water backflow branch intersects with the pure water discharge branch at a first pure water backflow intersection point, and the pure water backflow branch intersects with the raw water branch at a second pure water backflow intersection point;

[0037] the raw water branch is provided with a preposition device, the preposition device is used for buffering raw water of the raw water branch or / and pure water discharged and backflowed from the pure water outlet; the preposition device is located downstream of the second pure water backflow intersection point and upstream of the booster device;

[0038] the filtering system is used for performing a flushing operation when it is determined that the water production branch satisfies a flushing condition, and the flushing operation comprises a first stage flushing and / or a second stage flushing;

[0039] wherein, when the first stage of flushing is performed, the pure water return branch is used to return the pure water generated by the product water branch to the pre-treatment device to push the water in the pre-treatment device out to the booster device and then input the product water branch to flush the filter element;

[0040] wherein, when the second stage of flushing is performed, the waste water discharge branch is opened, and the pre-treatment device is used to push the water stored therein out to the booster device and then input the product water branch in a large flow manner to perform a burst flush on the filter element;

[0041] the product water branch is used to perform first stage water production and second stage water production when it is determined that the product water branch meets water production conditions;

[0042] wherein, when the first stage of water production is performed, the waste water discharge branch is used to discharge waste water at a smaller than preset opening degree to discharge the pure water generated by the product water branch through the pure water discharge branch;

[0043] wherein, when the second stage of water production is performed, the waste water discharge branch is used to discharge waste water at the preset opening degree to discharge the pure water generated by the product water branch through the pure water discharge branch.

[0044] As an optional implementation, in the second aspect of the present application, the filter system further comprises:

[0045] a waste water return branch, the waste water return branch intersects with the waste water discharge branch at a first waste water return intersection, and the waste water return branch intersects with the raw water branch at a second waste water return intersection; the second waste water return intersection is located downstream of the pre-treatment device and upstream of the booster device;

[0046] wherein, when the first stage of flushing is performed, the waste water return branch is used to return the waste water discharged by the waste water outlet to the booster device and then input the product water branch to maintain water quality balance of the filter element; and the waste water discharge branch is closed.

[0047] As an optional implementation, in the second aspect of the present application, a pure water return valve assembly is arranged on the pure water return branch; a waste water return valve assembly is arranged on the waste water return branch; a pure water valve assembly is arranged on the pure water discharge branch; and a waste water valve assembly is arranged on the waste water discharge branch.

[0048] As an optional implementation, in the second aspect of the present application, the filter system further comprises:

[0049] a water quality detection device arranged on a branch in communication with the waste water outlet, the water quality detection device being used to monitor a real-time water quality value of the waste water outlet;

[0050] The water quality detection device comprises:

[0051] a first water quality detection device arranged at the wastewater outlet; or / and,

[0052] a second water quality detection device arranged at the wastewater backflow branch; or / and,

[0053] a third water quality detection device arranged at the wastewater discharge branch.

[0054] As an optional implementation, in the second aspect of the present application, when the wastewater backflow branch shares a part of the branch with the wastewater discharge branch, a wastewater proportioning device is arranged at the branch shared by the wastewater backflow branch and the wastewater discharge branch, and the wastewater proportioning device is used to adjust the proportion of the water quantity of the wastewater discharged by the wastewater outlet flowing into the wastewater backflow branch and the wastewater discharge branch, respectively.

[0055] As an optional implementation, in the second aspect of the present application, a fourth water quality detection device is arranged at the water inlet of the filter element of the water production branch, and the fourth water quality detection device is used to detect the water quality of the water inlet of the filter element.

[0056] As an optional implementation, in the second aspect of the present application, a fifth water quality detection device is arranged at the raw water branch, and the fifth water quality detection device is located downstream of the second pure water backflow intersection and upstream of the preposition device, and the fifth water quality detection device is used to detect the water quality of the mixed water formed by mixing the pure water discharged by the pure water outlet after backflow and the raw water in the raw water branch.

[0057] As an optional implementation, in the second aspect of the present application, a sixth water quality detection device is arranged at the raw water branch, and the sixth water quality detection device is located downstream of the preposition device and upstream of the second wastewater backflow intersection, and the sixth water quality detection device is used to detect the water quality of the water output by the preposition device.

[0058] The third aspect of the present application discloses another filtering device based on a circulating water path, and the device comprises:

[0059] a memory storing executable program codes;

[0060] a processor coupled with the memory;

[0061] The processor invokes the executable program codes stored in the memory to execute part or all of the steps of any one of the filtering methods based on a circulating water path disclosed in the first aspect of the present application.

[0062] The fourth aspect of the present application discloses a computer storage medium, which stores computer instructions, and when the computer instructions are invoked, part or all steps of any one of the filtering methods based on a circulating water path disclosed in the first aspect of the present application are executed.

[0063] Compared with the prior art, the present application has the following beneficial effects:

[0064] The present application discloses a filtering method based on a circulating water path, which is applied to a filtering system, the filtering system comprising a raw water branch, a booster device, a water production branch, a waste water discharge branch, a pure water discharge branch, a pure water return branch and a preposition device, when it is judged that the water production branch meets the flushing condition, the filtering system is controlled to execute the flushing operation, the flushing operation comprising the first stage flushing and / or the second stage flushing; when it is judged that the water production branch meets the water production condition, the filtering system is controlled to execute the first stage water production and the second stage water production. It can be seen that the present application can provide a multi-stage flushing and water production control mechanism to effectively flush and produce water for the filtering system, significantly improve the intelligent control level of the filtering system, improve the flushing efficiency of the filter core, improve the water production rate of the filtering system, improve the quality of the first cup of water, and avoid waste of water resources. BRIEF DESCRIPTION OF DRAWINGS

[0065] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0066] Figure 1 is a flowchart of a filtering method based on a circulating water path disclosed by the embodiments of the present application;

[0067] Figure 2 is a flowchart of another filtering method based on a circulating water path disclosed by the embodiments of the present application;

[0068] Figure 3 is a structural schematic diagram of a filtering system based on a circulating water path disclosed by the embodiments of the present application;

[0069] Figure 4 is a structural schematic diagram of another filtering system based on a circulating water path disclosed by the embodiments of the present application;

[0070] Figure 5 is a structural schematic diagram of a filtering control device based on a circulating water path disclosed by the embodiments of the present application.

[0071] The numbers in the figure represent the following meanings: water production branch 1; pure water backflow valve assembly 2; booster device 3; first water quality detection device 4; pre-device 5; waste water backflow valve assembly 6; fourth water quality detection device 7; eighth water quality detection device 8; fifth water quality detection device 9; waste water proportioning device 10; second water quality detection device 11; third water quality detection device 12; waste water valve assembly 13; pure water valve assembly 14; first pure water backflow intersection A; second pure water backflow intersection B; first waste water backflow intersection C; second waste water backflow intersection D. DETAILED DESCRIPTION

[0072] In order to make the personnel in the technical field better understand the application scheme, the technical scheme in the embodiments of the application will be clearly and completely described below in combination with the drawings in the embodiments of the application. Obviously, the described embodiments are only part of the embodiments of the application, rather than all the embodiments. Based on the embodiments in the application, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the application.

[0073] The terms "first", "second", and the like in the specification and claims of the application and the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, device, product or end including a series of steps or units is not limited to the listed steps or units, but can optionally include steps or units not listed, or can optionally include other steps or units inherent to the process, method, product or end.

[0074] In this document, the term "embodiment" means that the specific feature, structure or property described in connection with the embodiment can be included in at least one embodiment of the application. The appearance of this phrase in various places in the specification does not necessarily mean the same embodiment, nor is it independent or alternative to other embodiments. Those skilled in the art explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0075] The application discloses a filtering method and device based on a circulating waterway, which can provide multi-stage flushing and water production control mechanisms to effectively flush and produce water for the filtering system, significantly improve the intelligent control level of the filtering system, improve the flushing efficiency of the filter element, improve the water production rate of the filtering system, improve the quality of the first cup of water, and avoid waste of water resources. In addition, one or more embodiments of the application can be applied to any filtering system, such as a household filtering system, a commercial water purifier, a water purification device for a water purification plant, etc. The embodiments of the application are not limited, and will be described in detail below.

[0076] Embodiment One

[0077] Please refer to Figure 1 , Figure 1 is a flowchart of a filtering method based on a circulating water path according to an embodiment of the present application. As shown in the figure, the filtering method based on the circulating water path can include the following operations: Figure 1

[0078] 101, determining whether the water production branch meets the flushing condition.

[0079] In the embodiment of the present application, the filtering system includes a raw water branch, a booster device, a water production branch, a waste water discharge branch and a pure water discharge branch, the water production branch includes a filter core water inlet, a filter core, a pure water outlet and a waste water outlet, the booster device is arranged on the raw water branch and is used to generate a water pressure difference, the booster device is located upstream of the water production branch, the filtering system further includes a pure water backflow branch and a preposition device, the preposition device is located upstream of the booster device. The raw water flows through the preposition device and is pressurized by the booster device, and then is input into the filter core water inlet of the water production branch, and is filtered by the filter core of the water production branch into pure water and waste water. The pure water can be backflowed to the upstream of the preposition device through the pure water backflow branch and then input into the water production branch through the booster device, or can be discharged through the pure water discharge branch. The waste water can be discharged through the waste water discharge branch. The method of the present application needs to determine whether the water production branch meets the flushing condition, that is, whether the filter core meets the flushing condition, and the flushing operation is started only when the flushing condition is met. For example, when the TDS at the waste water outlet changes to a certain value after the user accumulates a certain volume of water, the flushing operation is started. In the embodiment of the present application, the preposition device is used to buffer the water input by the raw water branch and / or the pure water backflow branch. The preposition device can include a single-cavity water storage device, a multi-cavity water storage device, a gas bag water storage device, a filtering device, etc., which is not limited in the embodiment of the present application. In addition, it should be noted that the capacity of the preposition device is not limited in the present application, and preferably, the capacity of the preposition device is adjustable.

[0080] 102, when it is determined that the water production branch meets the flushing condition, the filtering system is controlled to perform the flushing operation, which includes the first-stage flushing and / or the second-stage flushing.

[0081] In the embodiment of the present application, when it is determined that the water production branch meets the flushing condition, it means that the filter core needs to be flushed, and the flushing of the filter core in the embodiment of the present application is divided into two stages: the first-stage flushing and / or the second-stage flushing. The order of the two-stage flushing is not limited in the embodiment of the present application.

[0082] 103, when the first-stage flushing is performed, the filtering system is controlled to perform the first flushing operation.

[0083] ​In the embodiment of the present application, the first flushing operation is used to return the pure water generated by the water production branch to the pre-device through the pure water return branch, so as to push the water in the pre-device to the booster device and then input the water production branch to flush the filter element.

[0084] In the first stage of flushing, only pure water or mixed water of pure water and raw water is input to the pre-device, at this time, the water quality value (such as TDS, alkalinity, hardness, etc., which is not limited in the embodiment of the present application) of the input water is obviously very small (that is, the water quality condition is good), at this time, the water level in the pre-device is low-concentration water, which can achieve good flushing effect on the filter element. At the same time, the waste water discharge branch is controlled to be discharged at a small flow or closed (it can also be closed first and then discharged at a small flow; or a certain flow is discharged first, and then the discharge flow is gradually reduced to closed), it should be noted that the smaller the waste water discharge, the lower the concentration of the dilution water cached in the pre-device, that is, the better the water quality.

[0085] 104、In the second stage of flushing, the filtering system is controlled to execute the second flushing operation.

[0086] In the embodiment of the present application, the second flushing operation is used to open the waste water discharge branch, and the water in the pre-device is pushed out to the booster device and then input to the water production branch to perform a burst flush on the filter element.

[0087] In the second stage of flushing, the pure water discharge branch is closed, and the waste water discharge branch is opened to a large flow discharge degree, so that the low-concentration water cached in the pre-device is quickly flushed into the waste water side of the filter element to flush and replace the concentrated water in the waste water side. At this time, because the opening degree of the waste water discharge branch is large, the water inlet of the filter element is almost not concentrated, and the water concentration of the waste water side in the entire filter element is almost equal to the concentration of the water inlet of the filter element, so that the average water concentration of the entire filter element is very low (equilibrium concentration).

[0088] 105、Judge whether the water production branch meets the water production condition.

[0089] 106、When it is judged that the water production branch meets the water production condition, the filtering system is controlled to execute the first stage of water production and the second stage of water production.

[0090] 107、In the first stage of water production, the filtering system is controlled to execute the first water production operation.

[0091] In the embodiment of the present application, in the first stage of water production, the filtering system is controlled to execute the first water production operation, and the first water production operation is used to control the waste water discharge branch to discharge waste water at a smaller than preset opening degree, so as to discharge the pure water generated by the water production branch through the pure water discharge branch.

[0092] In the embodiment of the present application, the time or flow of wastewater discharge can be controlled according to a preset control mode. The preset control mode can be a time mode, a water quality mode, or a combination of the time mode and the water quality mode, and the embodiment of the present application is not limited in this regard.

[0093] 108. When the second-stage water production is performed, the filtration system is controlled to perform a second water production operation.

[0094] In the embodiment of the present application, when the second-stage water production is performed, the filtration system is controlled to perform a second water production operation, and the second water production operation is used to control the wastewater discharge branch to discharge wastewater at a preset opening degree, so as to discharge the pure water produced by the water production branch through the pure water discharge branch.

[0095] It can be seen that the method described in the embodiment of the present application can provide a multi-stage flushing and water production control mechanism, so as to effectively flush and produce water for the filtration system, significantly improve the intelligent control level of the filtration system, improve the flushing efficiency of the filter element, improve the water production rate of the filtration system, improve the quality of the first cup of water, and avoid waste of water resources.

[0096] In an optional embodiment, the method can further include the following operations:

[0097] When the first-stage water production is performed, it is determined whether the first-stage water production is completed, and when it is determined that the first-stage water production is completed, the second-stage water production is started.

[0098] The determination of whether the first-stage water production is completed includes:

[0099] It is determined whether the duration of the first-stage water production exceeds a first preset duration, and when it is determined that the duration of the first-stage water production exceeds the first preset duration, it is determined that the first-stage water production is completed; or

[0100] It is determined whether a first water quality value of the wastewater outlet exceeds a first water quality threshold, and when it is determined that the first water quality value of the wastewater outlet exceeds the first water quality threshold, it is determined that the first-stage water production is completed.

[0101] In the embodiment of the present application, the division point between the first-stage water production and the second-stage water production process can also be controlled according to a preset control mode. The preset control mode can be a time mode, a water quality mode, or a combination of the time mode and the water quality mode, and the embodiment of the present application is not limited in this regard.

[0102] It can be seen that the method described in the embodiment of the present application can provide a flexible control mode, accurately divide the water production stages, and be beneficial to realizing the fine regulation and control level of the water production process, and further improve the water production rate of the filtration system.

[0103] In yet another optional embodiment, determining whether the water production branch satisfies the flushing condition can include the following operations:

[0104] determining whether the first water quality value of the wastewater outlet exceeds a fourth water quality threshold value, and when it is determined that the first water quality value exceeds the fourth water quality threshold value, determining that the water production branch satisfies the flushing condition; or

[0105] determining whether the third water quality value of the pure water outlet exceeds a fifth water quality threshold value, and when it is determined that the third water quality value exceeds the fifth water quality threshold value, determining that the water production branch satisfies the flushing condition; or

[0106] determining whether the fourth water quality value of the pure water discharge branch exceeds a sixth water quality threshold value, and when it is determined that the fourth water quality value exceeds the sixth water quality threshold value, determining that the water production branch satisfies the flushing condition; or

[0107] determining whether a time difference between a current time point and a time point at which the last flushing of the water production branch ends exceeds a second preset time length, and when it is determined that the time difference between the current time point and the time point at which the last flushing of the water production branch ends exceeds the second preset time length, determining that the water production branch satisfies the flushing condition; or

[0108] determining whether a working time length of the water production branch exceeds a third preset time length, and when it is determined that the working time length of the water production branch exceeds the third preset time length, determining that the water production branch satisfies the flushing condition, wherein the working time length includes a single water production working time length or a total time length of the last N water production working time lengths; or

[0109] determining whether a water production amount of the water production branch exceeds a preset water amount, and when it is determined that the water production amount of the water production branch exceeds the preset water amount, determining that the water production branch satisfies the flushing condition, wherein the water production amount includes a single water production amount or a total amount of the last N water production amounts; or

[0110] determining whether a water production frequency of the water production branch exceeds a preset water production frequency, and when it is determined that the water production frequency of the water production branch exceeds the preset water production frequency, determining that the water production branch satisfies the flushing condition, wherein the water production frequency includes a total sum of water production frequencies between a current time point and a time point at which the last flushing of the water production branch ends or a total number of water productions in a water production life cycle of the water production branch.

[0111] It can be seen that the method described in the embodiments of the present application can provide a multi-stage water path control mechanism to effectively flush and produce water for the filtration system. In addition, the present application proposes a plurality of methods for detecting whether the filter element satisfies the flushing condition, which can more accurately monitor the use of the filter element to achieve accurate flushing of the filter element, avoid unnecessary flushing operations, further improve the flushing effect of the filter element, and improve the water production rate of the filtration system.

[0112] Embodiment Two

[0113] Referring to Figure 2 , Figure 2 is another flowchart of the filtering method based on the circulating water path disclosed by the embodiment of the present application. As shown in Figure 2 , the filtering method based on the circulating water path can include the following operations:

[0114] 201. Determine whether the water production branch meets the flushing condition.

[0115] 202. When it is determined that the water production branch meets the flushing condition, control the filtering system to perform the flushing operation, which includes the first-stage flushing and / or the second-stage flushing.

[0116] 203. When the first-stage flushing is performed, control the filtering system to perform the first flushing operation, and control the waste water backflow branch to perform the first waste water backflow operation.

[0117] In the embodiment of the present application, when the first-stage flushing is performed, the filtering system is controlled to perform the first flushing operation, and the waste water backflow branch is controlled to perform the first waste water backflow operation, which is used to backflow the waste water discharged from the waste water outlet to the water production branch after the increasing device to maintain the water quality balance of the filter core, and the waste water discharge branch is closed.

[0118] In the embodiment of the present application, the pure water produced by the water production branch is backflowed to the pre-device through the pure water backflow branch to dilute the raw water in the pre-device into low-concentration water, and at the same time, the waste water produced by the water production branch is backflowed to the downstream of the pre-device and input to the water production branch through the increasing device, which can maintain the TDS balance of the filter core, and at this time, the waste water is not discharged, which can save the flushing water.

[0119] 204. When the second-stage flushing is performed, control the filtering system to perform the second flushing operation.

[0120] 205. Determine whether the water production branch meets the water production condition.

[0121] 206. When it is determined that the water production branch meets the water production condition, control the filtering system to perform the first-stage water production and the second-stage water production.

[0122] 207. When the first-stage water production is performed, control the filtering system to perform the first water production operation, and control the waste water backflow branch to perform the second waste water backflow operation.

[0123] In the embodiment of the present application, when the first-stage water production is performed, the filtering system is controlled to perform the first water production operation, and the waste water backflow branch is controlled to perform the second waste water backflow operation, which is used to control the waste water backflow branch to backflow the waste water discharged from the waste water outlet to the water production branch after the increasing device to input the pure water produced by the water production branch to the water production branch through the pure water discharge branch.

[0124] In the embodiment of the present application, after the flushing operation is performed, the concentration of the waste water generated by the water production branch is low, and the low-concentration waste water can be input into the water production branch through the waste water reflux branch to produce water, so as to save water.

[0125] 208. In the second-stage water production, the filtering system is controlled to perform a second water production operation.

[0126] In the embodiment of the present application, for other descriptions of steps 201-208, please refer to the detailed description of steps 101-108 in the first embodiment, and the present application will not be described again.

[0127] It can be seen that the method described in the embodiment of the present application can provide a multi-stage water path control mechanism combining pure water and waste water circulation. After the filtering system is effectively flushed, the mixed water production operation is continued through the waste water reflux circulation, the reuse of the mixed water in the pre-treatment device and the waste water in the water production process is formed, the purpose of secondary water saving is achieved, the problem of poor water quality of the first cup of water when the user takes water can be solved, the water production rate of the filtering system is improved, and the waste of water resources is avoided.

[0128] In another optional embodiment, the method can further include the following operations:

[0129] In the first-stage water production or the second-stage water production, when it is judged that the first water quality value of the waste water outlet exceeds the second water quality threshold, or when it is judged that the second water quality value of the filter core water inlet exceeds the third water quality threshold, the waste water reflux branch is controlled to perform a closing operation.

[0130] In the embodiment of the present application, whether in the first-stage water production or the second-stage water production, the opening or closing of the waste water reflux branch can be controlled by monitoring whether the water quality value of the waste water outlet or the water quality value of the filter core water inlet exceeds the standard. At the same time, the use ratio of the waste water circulation can also be adjusted according to the above parameters to realize the precise use of waste water.

[0131] It can be seen that the method described in the embodiment of the present application can provide a flexible control mode. While not increasing the salinity of the filter core, the use ratio of the waste water circulation is dynamically adjusted to reach the level of fine regulation and control of waste water reflux, which is beneficial to realize the precise flushing of the filter core and improve the recycling rate of waste water, and further improve the water production rate of the filtering system.

[0132] Embodiment three

[0133] Please refer to Figure 3 , Figure 3This is a schematic diagram of a filtration system based on a circulating water path disclosed in an embodiment of the present invention. Wherein, as... Figure 3 As shown, the filtration system includes a water production branch 1, which includes a filter inlet, a filter element, a pure water outlet, and a wastewater outlet. The filter inlet is connected to a raw water branch, the pure water outlet is connected to a pure water discharge branch, and the wastewater outlet is connected to a wastewater discharge branch. The filter element can be a regular filter element or a reverse osmosis filter element; this embodiment of the invention does not limit the type. When the filter element is a reverse osmosis filter element, a booster device 3 can be installed upstream of the water production branch 1. The booster device 3 generates a water pressure difference, which can be used to allow pressurized water to permeate through the filter element and can also control the recirculation of water in the pure water return branch and the wastewater return branch. The filtration system may also include:

[0134] A pure water return branch, wherein the pure water return branch and the pure water discharge branch intersect at the first pure water return intersection point A, and the pure water return branch and the raw water branch intersect at the second pure water return intersection point B;

[0135] A pre-filter 5 is installed on the raw water branch line. The pre-filter 5 is used to buffer the raw water and / or the pure water discharged and returned from the pure water outlet of the raw water branch line. The pre-filter 5 is located downstream of the second pure water return intersection B and upstream of the booster device 3.

[0136] The filtration system is used to perform a flushing operation when it is determined that the production water branch meets the flushing conditions. The flushing operation includes a first-stage flushing and / or a second-stage flushing.

[0137] During the first stage of rinsing, the pure water return branch is used to return the pure water generated by the product water branch to the pre-filter 5, so that the water in the pre-filter 5 is pushed to the booster 3 and then input into the product water branch to rinse the filter element.

[0138] During the second stage of rinsing, the wastewater discharge branch is opened, and the pre-filter 5 is used to push the water it has buffered out to the booster 3 and then into the production water branch to flush the filter element.

[0139] The water production branch is used to carry out the first stage of water production and the second stage of water production when it is determined that the water production branch meets the water production conditions.

[0140] In the first stage of water production, the wastewater discharge branch is used to discharge wastewater at a lower than preset opening, so that the pure water produced by the water production branch can be discharged through the pure water discharge branch.

[0141] In the second stage of water production, the wastewater discharge branch is used to discharge wastewater at a preset opening, so that the pure water produced by the water production branch can be discharged through the pure water discharge branch.

[0142] It can be seen that the filter system described in the embodiment of the application can provide a multi-stage flushing and water production control mechanism to effectively flush and produce water of the filter system, significantly improve the intelligent control level of the filter system, improve the flushing efficiency of the filter element, improve the water production rate of the filter system, improve the quality of the first cup of water, and avoid waste of water resources.

[0143] In an optional embodiment, as shown in Figure 4 , Figure 4 is another filter system structure schematic diagram based on a circulating water path disclosed by the embodiment of the application, as shown in Figure 4 may include:

[0144] The wastewater backflow branch and the wastewater discharge branch meet at a first wastewater backflow intersection C, and the wastewater backflow branch and the raw water branch meet at a second wastewater backflow intersection D; the second wastewater backflow intersection D is located downstream of the pre-treatment device 5 and upstream of the booster device 3.

[0145] During the first-stage flushing, the wastewater backflow branch is used to backflow the wastewater discharged by the wastewater outlet to the water production branch after the booster device 3 to maintain the water quality balance of the filter element; and the wastewater discharge branch is closed.

[0146] It can be seen that the filter system described in the embodiment of the application can provide a multi-stage water path control mechanism combining pure water and wastewater circulation, after effectively flushing the filter system, continue to perform the mixed water production operation through the wastewater backflow circulation, form the reuse of the mixed water in the pre-treatment device and the wastewater during the water production process, achieve the purpose of secondary water saving, can solve the problem of poor quality of the first cup of water when the user takes water, at the same time, improve the water production rate of the filter system, and avoid waste of water resources.

[0147] In an optional embodiment, as shown in Figure 4 , a pure water backflow valve assembly 1 is arranged on the pure water backflow branch; a wastewater backflow valve assembly 6 is arranged on the wastewater backflow branch; a pure water valve assembly is arranged on the pure water discharge branch; and a wastewater valve assembly is arranged on the wastewater discharge branch.

[0148] In another optional embodiment, the filter system further includes:

[0149] A water quality detection device is arranged on the branch in communication with the wastewater outlet, and the water quality detection device is used to monitor the real-time water quality value of the wastewater outlet.

[0150] The water quality detection device includes:

[0151] A first water quality detection device 4 arranged at the wastewater outlet; or / and,

[0152] A second water quality detection device 11 arranged on the wastewater backflow branch; or / and,

[0153] The third water quality detection device 12 is arranged on the wastewater discharge branch.

[0154] Optionally, when the wastewater return branch shares part of the branch with the wastewater discharge branch, a wastewater proportioning device 10 is arranged on the shared branch of the wastewater return branch and the wastewater discharge branch, and the wastewater proportioning device 10 is used to adjust the proportion of the wastewater discharged from the wastewater outlet and flowing into the wastewater return branch and the wastewater discharge branch.

[0155] Optionally, the fourth water quality detection device 7 is arranged at the water inlet of the filter element of the produced water branch, and the fourth water quality detection device 7 is used to detect the water quality of the water inlet of the filter element.

[0156] Optionally, the fifth water quality detection device 9 is arranged on the raw water branch, and the fifth water quality detection device 9 is located downstream of the second pure water return intersection B and upstream of the preposition device 5, and the fifth water quality detection device 9 is used to detect the water quality of the mixed water formed by mixing the pure water discharged from the pure water outlet after return and the raw water in the raw water branch.

[0157] Optionally, the sixth water quality detection device 8 is arranged on the raw water branch, and the sixth water quality detection device 8 is located downstream of the preposition device 5 and upstream of the second wastewater return intersection D, and the sixth water quality detection device 8 is used to detect the water quality of the water output by the preposition device.

[0158] Embodiment four

[0159] Please refer to Figure 5 , Figure 5 is another structure diagram of the filtering control device based on the circulating water path disclosed by the embodiment of the present application. Among them, Figure 5 The device described can be a separate device, or can be integrated in a filtering treatment equipment, and the embodiment of the present application does not make limitation. As shown in the figure, Figure 5 The filtering control device based on the circulating water path can include:

[0160] The memory 401 stores executable program codes;

[0161] The processor 402 is coupled with the memory 401;

[0162] The processor 402 calls the executable program codes stored in the memory 401 to execute part or all of the steps of the filtering method based on the circulating water path disclosed by the embodiment one or the embodiment two of the present application.

[0163] Embodiment five

[0164] The embodiment of the present application discloses a computer storage medium, which stores computer instructions, and when the computer instructions are invoked, steps in the filtering method based on the circulating water path disclosed in the embodiment one or the embodiment two are executed.

[0165] The above-described device embodiments are only illustrative, wherein the modules described as separate components can or can not be physically separated, and the components displayed as modules can or can not be physical modules, i.e., can be located in one place or distributed on multiple network modules. Part or all of the modules can be selected to achieve the purpose of the embodiment scheme according to actual needs. Those skilled in the art can understand and implement without creative labor.

[0166] Through the specific description of the above embodiments, those skilled in the art can clearly understand that each embodiment can be realized by means of software and the necessary general hardware platform, and of course, can also be realized by hardware. Based on such understanding, the above technical solutions can be embodied in the form of a software product, and the computer software product can be stored in a computer readable storage medium, including a read-only memory (ROM), a random access memory (RAM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), a one-time programmable read-only memory (OTPROM), an electrically erasable programmable read-only memory (EEPROM), a compact disc read-only memory (CD-ROM) or other optical disk storage, a magnetic disk storage, a magnetic tape storage, or any other computer readable medium that can be used to carry or store data.

[0167] It should be noted that the computer program code required to implement the operations of the various parts of the description can be written in any one or more programming languages, including an object-oriented programming language such as Java, Scala, Smalltalk, Eiffel, JADE, Emerald, C++, C#, VB.NET, Python, etc., a conventional procedural programming language such as the C language, Visual Basic, Fortran 2003, Perl, COBOL 2002, PHP, ABAP, a dynamic programming language such as Python, Ruby and Groovy, or other programming languages. This program code can be executed entirely on the computer (PC, embedded smart device, etc.), or run on the user's computer as a standalone software package, or partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In the latter case, the remote computer can be connected to the user's computer by any network form, such as a local area network (LAN) or a wide area network (WAN), or connected to an external computer (for example, through the Internet), or in a cloud computing environment, or used as a service such as Software as a Service (SaaS).

[0168] Finally, it should be noted that: the filter method and device based on the circulating waterway disclosed by the embodiments of the present application are only the preferred embodiments of the present application, and are used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: the technical solutions recorded in the foregoing embodiments can still be modified, or some technical features can be replaced by equivalents; and these modifications or replacements do not make the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A filtration method based on a circulating water path, the method being applied to a filtration system, the filtration system comprising a raw water branch, a pressure boosting device, a product water branch, a waste water discharge branch and a pure water discharge branch, the product water branch comprising a filter element water inlet, a filter element, a pure water outlet and a waste water outlet, the raw water branch being provided with a pressure boosting device, the pressure boosting device being used to generate a water pressure difference, the pressure boosting device being located upstream of the product water branch, characterized in that, The filtration system further comprises a pure water backflow branch, a waste water backflow branch and a pre-device, the pre-device is located upstream of the booster device, the method comprises: determining whether the water production branch meets a flushing condition; when it is determined that the water production branch meets the flushing condition, controlling the filtration system to perform a flushing operation, the flushing operation comprising a first stage flushing and / or a second stage flushing; when the first stage flushing is performed, controlling the filtration system to perform a first flushing operation, the first flushing operation being used for backflowing the pure water produced by the water production branch to the pre-device through the pure water backflow branch, so as to push the water in the pre-device to the booster device and then input the water production branch to flush the filter element; and, when the first stage flushing is performed, the waste water backflow branch is used for backflowing the waste water discharged by the waste water outlet to the booster device and then inputting the water production branch, so as to maintain the water quality balance of the filter element; the waste water discharge branch is closed; wherein the waste water backflow branch and the raw water branch meet at a second waste water backflow intersection; the second waste water backflow intersection is located downstream of the pre-device and upstream of the booster device; when the second stage flushing is performed, controlling the filtration system to perform a second flushing operation, the second flushing operation being used for opening the waste water discharge branch and pushing the water in the pre-device to the booster device and then inputting the water production branch in a large flow manner to perform a burst flushing on the filter element; determining whether the water production branch meets a water production condition; when it is determined that the water production branch meets the water production condition, controlling the filtration system to perform a first stage water production and a second stage water production; when the first stage water production is performed, controlling the filtration system to perform a first water production operation, the first water production operation being used for controlling the waste water discharge branch to discharge waste water at a smaller than preset opening degree, so as to discharge the pure water produced by the water production branch through the pure water discharge branch; when the second stage water production is performed, controlling the filtration system to perform a second water production operation, the second water production operation being used for controlling the waste water discharge branch to discharge waste water at the preset opening degree, so as to discharge the pure water produced by the water production branch through the pure water discharge branch; and, the determining whether the water production branch meets the flushing condition comprises: determining whether a fourth water quality value of the pure water discharge branch exceeds a sixth water quality threshold value, when it is determined that the fourth water quality value exceeds the sixth water quality threshold value, it is determined that the water production branch meets the flushing condition.

2. The filtration method based on a circulating waterway according to claim 1, characterized by, when the first stage water production is performed, the method further comprises: controlling the waste water backflow branch to perform a second waste water backflow operation, the second waste water backflow operation being used for controlling the waste water backflow branch to backflow the waste water discharged by the waste water outlet to the booster device and then input the water production branch, so as to discharge the pure water produced by the water production branch through the pure water discharge branch.

3. The filtration method based on a circulating waterway according to claim 2, characterized by, the method further comprises: when it is determined that the first-stage water production is completed, starting the second-stage water production; wherein the determining whether the first-stage water production is completed comprises: determining whether the duration of the first-stage water production exceeds a first preset duration, and when it is determined that the duration of the first-stage water production exceeds the first preset duration, determining that the first-stage water production is completed; or determining whether the first water quality value of the wastewater outlet exceeds a first water quality threshold, and when it is determined that the first water quality value of the wastewater outlet exceeds the first water quality threshold, determining that the first-stage water production is completed.

4. The filtration method based on a circulation waterway according to claim 2 or 3, characterized by, The method further comprises: when it is determined that the first water quality value of the wastewater outlet exceeds a second water quality threshold, or when it is determined that the second water quality value of the filter element water inlet exceeds a third water quality threshold, controlling the wastewater backflow branch to perform a closing operation, during the first-stage water production or during the second-stage water production.

5. A filtration system based on a circulating water path, the filtration system comprising a raw water branch, a pressure boosting device, a product water branch, a waste water discharge branch and a pure water discharge branch, the product water branch comprising a filter inlet, a filter, a pure water outlet and a waste water outlet, the raw water branch being provided with a pressure boosting device for generating a water pressure difference, the pressure boosting device being located upstream of the product water branch, characterized in that, The filtration system is configured to perform the circulation waterway-based filtration method according to any one of claims 1-4, and further comprises: a pure water backflow branch, which intersects with the pure water discharge branch at a first pure water backflow intersection and intersects with the raw water branch at a second pure water backflow intersection; a prepositioning device arranged on the raw water branch, configured to buffer raw water of the raw water branch and / or pure water discharged by the pure water outlet backflow; the prepositioning device is located downstream of the second pure water backflow intersection and upstream of the pressure boosting device; The filtration system is configured to perform a flushing operation when it is determined that the product water branch satisfies a flushing condition, and the flushing operation comprises a first-stage flushing and / or a second-stage flushing; wherein, during the first-stage flushing, the pure water backflow branch is configured to backflow pure water generated by the product water branch to the prepositioning device, so as to push water in the prepositioning device to the pressure boosting device and then to the product water branch to flush the filter element; wherein, during the second-stage flushing, the wastewater discharge branch is opened, and the prepositioning device is configured to push water buffered therein to the pressure boosting device at a large flow rate and then to the product water branch to perform a burst flushing on the filter element; The product water branch is configured to perform first-stage water production and second-stage water production when it is determined that the product water branch satisfies a water production condition. wherein, during the first-stage water production, the wastewater discharge branch is configured to discharge wastewater at a smaller than a preset opening degree, so as to discharge pure water generated by the product water branch through the pure water discharge branch; wherein, during the second-stage water production, the wastewater discharge branch is configured to discharge wastewater at the preset opening degree, so as to discharge pure water generated by the product water branch through the pure water discharge branch.

6. The recirculating waterway-based filtration system of claim 5, wherein, The filtration system further comprises: a wastewater backflow branch, which intersects with the wastewater discharge branch at a first wastewater backflow intersection and intersects with the raw water branch at a second wastewater backflow intersection; the second wastewater backflow intersection is located downstream of the pre-treatment device and upstream of the booster device; wherein, when the first-stage flushing is performed, the wastewater backflow branch is used to backflow the wastewater discharged by the wastewater outlet to the booster device and then input into the product water branch, so as to maintain the water quality balance of the filter element; and the wastewater discharge branch is closed.

7. The recirculating waterway-based filtration system of claim 6, wherein, a pure water backflow valve assembly is arranged on the pure water backflow branch; a wastewater backflow valve assembly is arranged on the wastewater backflow branch; a pure water valve assembly is arranged on the pure water discharge branch; and a wastewater valve assembly is arranged on the wastewater discharge branch.

8. The recirculating waterway-based filtration system of claim 7, wherein, The filter system further comprises: a water quality detection device is arranged on the branch communicating with the wastewater outlet, and the water quality detection device is used to monitor the real-time water quality value of the wastewater outlet; wherein, the water quality detection device comprises: a first water quality detection device arranged at the wastewater outlet; or / and, a second water quality detection device arranged on the wastewater backflow branch; or / and, a third water quality detection device arranged on the wastewater discharge branch.

9. The recirculating waterway-based filtration system of claim 7 or 8, wherein, When the wastewater backflow branch and the wastewater discharge branch share part of the branch, a wastewater proportioning device is arranged on the branch shared by the wastewater backflow branch and the wastewater discharge branch, and the wastewater proportioning device is used to adjust the water quantity proportion of the wastewater discharged by the wastewater outlet flowing into the wastewater backflow branch and the wastewater discharge branch, respectively.

10. The recirculating waterway-based filtration system of claim 9, wherein, A fourth water quality detection device is arranged at the filter element water inlet of the product water branch, and the fourth water quality detection device is used to detect the water quality of the filter element water inlet.

11. The recirculating waterway-based filtration system of claim 10, wherein, A fifth water quality detection device is arranged on the raw water branch, and the fifth water quality detection device is located downstream of the second pure water backflow intersection and upstream of the pre-treatment device; the fifth water quality detection device is used to detect the water quality of the mixed water formed by mixing the pure water backflow discharged by the pure water outlet and the raw water in the raw water branch.

12. The recirculating waterway-based filtration system of claim 11, wherein, A sixth water quality detection device is arranged on the raw water branch, and the sixth water quality detection device is located downstream of the pre-treatment device and upstream of the second wastewater backflow intersection; the sixth water quality detection device is used to detect the water quality of the water output by the pre-treatment device.

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