A backwash water purification system and a control method thereof

Abstract

This invention relates to the field of water purification system technology, and in particular to a backwashing water purification system and its control method. The backwashing water purification system includes: a first filter device, a second filter device, and an adjustment component. The output end of the first filter device is connected to the downstream of the second filter device via a first pipeline. In the backwashing water purification system provided by this invention, the filtered water generated by the first filter device is directed to the downstream of the second filter device via the first pipeline to clean the second filter device through backwashing. The first pipeline is connected to an adjustment component for adjusting the pressure or flow rate of the filtered water generated by the first filter device. This allows for adjustment of the water pressure or flow rate of the filtered water generated by the first filter device during backwashing of the second filter device, thereby improving the filter membrane cleaning efficiency while preventing excessive pressure from causing filter membrane failure and reducing filter membrane lifespan.

Description

Technical Field

[0001] This invention relates to the field of water purification system technology, and in particular to a backwashing water purification system and its control method. Background Technology

[0002] Reverse osmosis and nanofiltration are semi-permeable membranes with the same function, achieving filtration through surface functional layers, but the membrane surface is not completely smooth. In complex water purification environments, after prolonged use, various types of fouling will form on the membrane surface, and the pressure in front of the membrane will compact this fouling. Although water purifiers perform a rinsing process after producing water, ordinary rinsing can only remove loose fouling from the membrane surface; some stubborn fouling that adheres tightly to the membrane is difficult to remove.

[0003] Backwashing is highly effective in restoring membrane function, but it is difficult for reverse osmosis and nanofiltration due to limitations in their production processes. Related technologies involve the following backwashing processes for filter membranes: 1. Connecting two filter membranes in parallel, using the pure water produced by one membrane to backwash the other; 2. Connecting a gas bladder or pressure tank in parallel to store pure water, using the pure water from the pressure tank to backwash the filter membrane.

[0004] However, in practical applications, the above two implementation methods still have technical defects:

[0005] Both of the above implementation methods require additional parallel or series filter membranes or the addition of water storage devices, which increases the design difficulty and cost of water purifiers. Furthermore, excessive backwashing pressure during the backwashing process can easily lead to filter membrane failure and reduce the service life of the filter membrane. Summary of the Invention

[0006] In view of this, the purpose of the present invention is to provide a backwashing water purification system and its control system to avoid damage to the filter membrane due to excessive backwashing pressure.

[0007] In a first aspect, embodiments of the present invention provide a backwashing water purification system, which includes: a first filter device, a second filter device, and a regulating component;

[0008] The output of the first filter device is connected to the downstream of the second filter device through the first pipeline, and the filtered water generated by the first filter device is used to backwash the second filter device.

[0009] The first pipeline is connected to an adjustment component for adjusting the pressure or flow rate of the filtered water produced by the first filtration device.

[0010] In conjunction with the first aspect, the filtered water generated by the first filtration device and the filtered water generated by the second filtration device are mixed for backwashing the second filtration device.

[0011] In combination with the first aspect, the output end of the first filtering device is connected to the upstream of the second filtering device through the second pipeline. After the first filtering device forms filtered water to backwash the second filtering device for a first period of time, the first filtering device forms filtered water to forwardly wash the second filtering device. While the first filtering device prepares pure water, the backwashed pure water is discharged.

[0012] In combination with the first aspect, the adjusting component includes:

[0013] A detection piece, connected to the first pipeline and close to the output end of the first pipeline, for detecting the flow rate or pressure of the filtered water in the first pipeline;

[0014] A valve, connected to the first pipeline, and adjusting the flow rate or pressure of the filtered water in the first pipeline by adjusting the opening and closing angle of the valve.

[0015] In combination with the first aspect, the backwashing pure water system further includes:

[0016] A third pipeline, one end of which is communicated with the first pipeline, and the other end of which is communicated with the downstream of the second filtering device;

[0017] A pressure regulating component, connected to the third pipeline, for regulating the pressure or flow rate of the filtered water formed by the second filtering device.

[0018] In combination with the first aspect, the mixing ratio of the filtered water formed by the first filtering device and the filtered water formed by the second filtering device is 2:1 - 1:2.

[0019] In combination with the first aspect, the backwashing pure water system further includes a control mechanism, and the control mechanism is electrically connected to the adjusting component.

[0020] In the second aspect, the present application provides a control method for a backwashing pure water system, and the method includes:

[0021] Obtaining detection data, where the detection data includes the pressure value or flow rate value of the filtered water in the first pipeline;

[0022] Based on the comparison relationship between the detection data and a preset first threshold, controlling the adjusting component to adjust the pressure value or flow rate value of the filtered water in the first pipeline.

[0023] In combination with the second aspect, the adjusting component includes a valve; the step of controlling the adjusting component to adjust the pressure value or flow rate value of the filtered water in the first pipeline based on the comparison relationship between the detection data and a preset first threshold includes:

[0024] If M < M0, controlling the valve to increase the opening degree;

[0025] If M = M0, controlling the valve to maintain the current opening degree;

[0026] If M > M0, controlling the valve to decrease the opening degree;

[0027] Where M represents the detection data and M0 represents the preset first threshold.

[0028] In conjunction with the second aspect, the backwash water purification system also includes a third pipeline connected to an adjustment component for regulating the pressure or flow rate of the filtered water generated by the second filtration device; the method further includes:

[0029] Acquire first data on the filtered water produced by the first filtration device and second data on the filtered water produced by the second filtration device;

[0030] Calculate the ratio of the first data point to the second data point;

[0031] If the ratio is less than a preset second threshold, the control adjustment component reduces the opening to reduce the second data of filtered water generated by the second filtration device;

[0032] If the ratio is greater than the preset third threshold, the control adjustment component increases the opening to increase the second data of filtered water generated by the second filtration device;

[0033] The second threshold is less than the third threshold.

[0034] The present invention provides the following beneficial effects: The present invention provides a backwash water purification system and its control method. The backwash water purification system includes: a first filter device, a second filter device, and an adjustment component; the output end of the first filter device is connected to the downstream of the second filter device through a first pipeline, and the first filter device generates filtered water for backwashing the second filter device; the first pipeline is connected to an adjustment component for adjusting the pressure or flow rate of the filtered water generated by the first filter device.

[0035] In the backwashing water purification system provided by this invention, the filtered water generated by the first filtration device is directed downstream of the second filtration device through a first pipeline to clean the second filtration device by backwashing. The first pipeline is connected to an adjustment component to adjust the pressure or flow rate of the filtered water generated by the first filtration device. This allows for adjustment of the water pressure or flow rate of the filtered water generated by the first filtration device during backwashing of the second filtration device. This improves the cleaning efficiency of the filter membrane while preventing excessive pressure from causing filter membrane failure and reducing its service life.

[0036] Other features and advantages of the invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention are realized and obtained in accordance with the structures particularly pointed out in the description, claims and drawings.

[0037] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0038] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0039] Figure 1 This is a schematic diagram of the backwashing water purification system provided in Embodiment 1 of the present invention;

[0040] Figure 2 This is a schematic diagram of another backwashing water purification system provided in Embodiment 1 of the present invention;

[0041] Figure 3 This is a schematic diagram of another backwashing water purification system provided in Embodiment 2 of the present invention;

[0042] Figure 4 This is a schematic diagram of the control method for the backwash water purification system provided in Embodiment 3 of the present invention.

[0043] Figure label:

[0044] 1-First filtration device, 2-Second filtration device, 3-Adjusting component, 31-Detection element, 32-Valve, 4-First pipeline, 5-Second pipeline, 6-First valve, 7-Second valve, 8-Booster pump, 9-Sewage discharge pipeline, 10-Third valve, 11-Post-treatment filter element, 12-Fourth valve, 13-Third pipeline, 14-Pressure regulating valve, 15-Measuring element, 16-Water storage tank. Detailed Implementation

[0045] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0046] To facilitate understanding of this embodiment, the application scenarios and design concepts of this application embodiment will be briefly introduced below.

[0047] As people's living standards improve, water purifiers are becoming increasingly popular. Water purifiers often contain filter cartridges, which need to be cleaned after prolonged use. Common cleaning methods include manual disassembly and cleaning or automatic flushing. Manual disassembly and cleaning is cumbersome and inconvenient for users. While automatic flushing eliminates the need for manual disassembly, current automatic flushing technology often only allows for single-sided flushing, such as backwashing from the inside of the filter cartridge to the outside. This single-sided flushing mode results in poor flushing performance.

[0048] Backwashing has a good effect on restoring membrane function. However, due to the limitations of the production process, backwashing is difficult for reverse osmosis and nanofiltration. The backwashing process of filter membranes in related technologies is as follows: 1. Connect two filter membranes in parallel and use the pure water generated by one filter membrane to backwash the other filter membrane; 2. Connect a gas bag or pressure tank for storing pure water in parallel and use the pure water in the pressure tank to backwash the filter membrane.

[0049] Both of the above implementation methods require additional parallel or series filter membranes or the addition of water storage devices, which increases the design difficulty and cost of water purifiers. Furthermore, excessive backwashing pressure during the backwashing process can easily lead to filter membrane failure and reduce the service life of the filter membrane.

[0050] Example 1

[0051] Combination Figure 1 As shown, this application provides a backwash water purification system, which includes: a first filter device 1, a second filter device 2, and an adjustment component 3.

[0052] The output end of the first filter device 1 is connected to the downstream of the second filter device 2 through the first pipeline 4, and the first filter device 1 generates filtered water for backwashing the second filter device 2.

[0053] The first pipeline 4 is connected to an adjustment component 3, which is used to adjust the pressure or flow rate of the filtered water generated by the first filter device 1.

[0054] In this application, filtered water is generated by the first filter device 1 and connected to the downstream of the second filter device 2 through the first pipeline 4 to backwash the second filter device 2. Then, the pressure or flow rate of the filtered water is adjusted by the regulating component 3 on the first pipeline 4 to adjust the backwash water flow rate or water pressure based on the backwashing of the second filter device 2, so as to reduce the impact of water flow or water pressure on the second filter device 2 and avoid the phenomenon of filter membrane failure or reduced life due to excessive backwashing impact force.

[0055] Compared to the methods of adding filter membranes or water storage devices in related technologies, the backwashing water purification system provided in this application has a simple pipeline, occupies little space, and can reduce costs. Furthermore, backwashing the filter membrane with purified water can improve the rinsing efficiency and degree of the filter membrane, which is beneficial to extending the service life of the filter membrane and adapting it to harsh operating environments.

[0056] In one feasible approach, the input end of the first filtration device 1 can be directly connected to a purified water source (not shown in the figure). For example, the input end of the first filtration device 1 can be connected to a purified water storage tank, in which the prepared purified water is stored.

[0057] As another feasible approach, combining Figure 1 As shown, the input end of the first filtration device 1 is connected to the raw water source. The first filtration device 1 itself filters the raw water to form purified water. The first filtration device 1 can be a filter element made of one or more materials such as metal wire, filter cloth, filter paper, yarn, microporous plastic, and microporous ceramic. It is fixed on the tube sheet and installed in the cylinder.

[0058] In conjunction with the first aspect, the filtered water generated by the first filtration device 1 and the filtered water generated by the second filtration device 2 are mixed for backwashing the second filtration device.

[0059] Combination Figure 1 As shown in this application, the output end of the first filter device 1 is connected downstream of the second filter device 2. At this time, the filtered water formed by the first filter device 1 and the filtered water formed by the second filter device 2 are mixed, and the mixed filtered water backwashes the second filter device 2.

[0060] The filtered water downstream of the second filtration device 2 can be either purified water or pure water, as per reference. Figure 1 As shown, in this embodiment, the raw water source flows upstream of the second filter device 2 after being filtered by the first filter device 1. After being filtered by the second filter device 2, pure water is formed. At this time, the pure water is mixed with the clean water formed by the first filter device 1, and the second filter device 2 is backwashed.

[0061] In conjunction with the first aspect, the output end of the first filter device 1 is also connected to the upstream of the second filter device 2 through the second pipeline 5. After the first filter device 1 forms filtered water to backwash the second filter device 2 for a first time, the first filter device 1 forms filtered water to forward wash the second filter device 2. The first filter device 1 discharges the backwashed pure water while preparing pure water.

[0062] refer to Figure 2As shown, the connecting pipe between the output end of the first filter device 1 and the input end of the second filter device 2 is the second pipe 5. A first valve 6 is installed on the second pipe 5, and a second valve 7 is installed on the first pipe 4. When the first valve 6 is open and the second valve 7 is closed, the raw water is filtered by the first filter device 1 to form purified water, which then flows into the second filter device 2 through the first valve 6 to output pure water. When the first valve 6 is closed and the second valve 7 is open, the raw water is filtered by the first filter device 1 to form purified water, which flows downstream of the second filter device 2 along the first pipe 4. It can be seen that by adjusting the opening and closing states of the first valve 6 and the second valve 7, the purified water formed by the first filter device 1 can be guided to different pipes.

[0063] Among them, combined Figure 2 As shown, a booster pump 8 is also provided downstream of the first filter device 1. When the booster pump 8 is turned on, the first valve 6 is turned off, and the second valve 7 is turned off, the formed purified water is pressurized and guided to the input end of the second filter device 2, which can realize the backwashing of the second filter device 2.

[0064] In this way, after the first backwashing time (t1), the filter membrane is rinsed with clean water. Since there is clean water inside the backwashing filter membrane, the clean water inside is replaced and flushed away by the pure water prepared by the second filter device 2 during the forward rinsing, so as to further improve the rinsing efficiency of the second filter device and ensure that the second filter device 2 always contains pure water when the user uses water.

[0065] Combination Figure 2 As shown, the backwash water purification system also includes a sewage pipe 9, one end of which is connected to the second filter device 2 and the other end is connected to the sewage pipe. A third valve 10 is also installed on the sewage pipe 9. Opening the third valve 10 can discharge sewage along the sewage pipe 9.

[0066] In conjunction with the first aspect, the regulating component 3 includes: a detection element 31 and a valve 32.

[0067] Combination Figure 2 As shown, the detection element 31 is connected to the first pipeline 4 and is close to the output end of the first pipeline 4, and is used to detect the flow rate or pressure of the filtered water in the first pipeline 4.

[0068] Valve 32 is connected to the first pipeline 4, and the flow rate or pressure of the filtered water in the first pipeline 4 can be adjusted by adjusting the opening angle of valve 32.

[0069] In this application, by coordinating the detection element 31 and the valve 32, the opening and closing angle of the valve 32 is adjusted to regulate the flow rate or pressure of the backwash water, which can better control the backwash pressure entering the second filter device and protect the second filter device 2 from damage.

[0070] Combination Figure 1 , Figure 2 As shown, in this embodiment, the first filtration device 1 is a pretreatment filter element, the second filtration device 2 is a filter membrane, and the first pipeline 4 is a backwashing pipeline used to connect the output end of the pretreatment filter element to the downstream of the filter membrane.

[0071] In the normal process of preparing pure water, the raw water flows along the second water production pipeline 5 to the filter membrane to form pure water, and then passes through the post-treatment filter cartridge 11 and is output from the faucet. In this embodiment, a booster pump 8 is also installed on the second pipeline 5. The booster pump 8 is used to pressurize the water flow. During the water production process, the first filter device 1 filters the raw water to form clean water. Under the pressurization action of the booster pump 8, the water flows to the second filter device 2 when the first valve 6 is open and the second valve 7 is closed. After being filtered again by the second filter device 2, pure water is formed. When the fourth valve 12 is open, the water flows to the post-treatment filter cartridge 11 to make potable pure water, which is then output to the water user through the faucet.

[0072] During the backwashing process, raw water is filtered by the first filter device 1 to form purified water. The second valve 7 is opened, and the other valves are closed, allowing the water to enter the first pipeline 4. The output end of the first pipeline 4 is connected to the downstream of the second filter device 2 for backwashing. The first pipeline 4 is equipped with a detection element 31 (i.e., a pressure sensor or flow sensor) to detect the pressure or flow value on the first pipeline 4. Through the coordinated action with the valve 32 (in this embodiment, a solenoid valve, specifically a metering valve), the opening degree of the metering valve is adjusted, which can effectively control the backwashing pressure entering the second filter device 2 and protect the filter membrane in the second filter device 2 from damage.

[0073] The first filter device 1 can be PP+CTO, UF or wet carbon rod filter element.

[0074] The post-treatment filter element 11 can be a mineralized carbon rod filter element, an antibacterial carbon filter element, or other functional post-carbon filter element.

[0075] During the backwashing process, the detection element 31 detects that the optimal pressure on the branch is P2 = 25-30 psi, because excessive pressure may affect the performance of the filter membrane in the second filter device 2, and excessively low pressure may reduce the effect of backwashing.

[0076] Valve 32 is a solenoid valve with adjustable opening degree and signal feedback. In this application, the opening degree of valve 32 is adjusted by the pressure or flow rate on the first pipeline 4 to ensure the backwashing pressure. To fully backwash the second filter device 2, the backwashing time should not be less than 60 seconds.

[0077] After the backwashing is completed, the first valve 6 and the third valve 10 are opened, and other valves are closed. The booster pump 8 is started, and normal flushing is carried out with purified water. Since there is purified water left inside the second filter device 2 after backwashing, pure water can also be prepared during forward flushing to displace and wash it away. All the water during forward flushing goes through the sewage pipeline 9. The forward flushing process further improves the membrane flushing efficiency and ensures that the inside of the filter membrane of the second filter device 2 is pure water when the user uses water. During the forward flushing process, after the purified water is pressurized by the booster pump 8, it flushes the second filter device 2. This can improve the flushing effect better. Among them, the forward flushing time is not less than 30 seconds.

[0078] Among them, the detection component 31 is a pressure sensor or a flow sensor, and the parameter is a pressure value or a flow value; in this embodiment, as an implementable method, the detection component 31 is a pressure sensor, which is used to collect the first pressure value of the purified water flow used to backwash the second filter device 2 in the first pipeline 4. Compare this first pressure value M with the set threshold M0. When M < M0, it means that the pressure value of the current purified water liquid flow used for backwashing is not enough and needs to be pressurized. At this time, increase the opening degree of the valve 32 to divert more purified water into the first pipeline 4, so as to increase the pressure value of the purified water liquid flow used for backwashing in the first pipeline 4 to ensure the backwashing effect; similarly, when M > M0, it means that the current pressure value is too large, and the pressure of the backwashing liquid flow should be reduced to avoid damage to the filter membrane in the second filter device 2 caused by excessive pressure. At this time, control the valve 32 to reduce the opening degree to reduce the pressure of the backwashing liquid flow; similarly, when M = M0, it means that the current backwashing liquid flow pressure is at an appropriate value, and the valve 32 can maintain the current opening degree.

[0079] As another implementable method, the detection component 31 can also be a flow sensor. From the flow rate and flow velocity relationship formula and Bernoulli equation in fluid mechanics, the relationship formula between the pressure and flow rate of the backwashing liquid flow in the first pipeline 4 can be calculated.

[0080] Specifically, the flow rate and flow velocity relationship formula is: Q = A×V; where, A represents the cross-sectional area of the pipeline, and V represents the velocity of the fluid in the pipeline;

[0081] The Bernoulli equation is: P1 + 1 / 2ρV1 2 + ρgh1 = P2 + 1 / 2ρV2 2 + ρgh2; where, P represents the pressure of the flow sensor, ρ represents the density of the liquid, and V1 is the flow velocity of the backwashing liquid flow; among them, the potential energy ρgh caused by the liquid level difference on the first pipeline 4 can be ignored; the outlet end of the filter membrane is in a static state, and its flow velocity V2 can also be ignored.

[0082] Combining the above formulas, it is deduced that: △P = 8ρ / (πA 2 )×Q 2Where Q is the flow rate of the backwash liquid (clean water flow) in the first pipeline 4 monitored by the flow sensor; the pressure value on the first pipeline 4 corresponding to the flow rate value can be calculated from this formula. In conjunction with the above example, the preferred backwash liquid pressure is 25-30 psi. A suitable backwash liquid (clean water) flow rate value can be derived and used as the first preset threshold.

[0083] By adjusting the pressure of the backwash liquid flow in the above manner, the cleaning effect on the filter membrane inside the second filter device 2 is ensured while avoiding damage to the filter membrane inside the second filter device 2 due to excessive rinsing force.

[0084] Example 2

[0085] The backwash water purification system provided in this embodiment differs from that in Embodiment 1 in that it further includes a third pipeline 13 and a pressure regulating component.

[0086] Combination Figure 3 As shown, one end of the third pipe 13 is connected to the first pipe 4, and the other end is connected to the downstream of the second filter device 2.

[0087] The pressure regulating component is connected to the third pipeline 13 and is used to regulate the pressure or flow rate of the filtered water generated by the second filter device 2.

[0088] Combination Figure 3 As shown, the third pipe 13 connects the first pipe 4 to the downstream of the second filter device 2. Thus, the filtered water from the second filter device 2 can flow along the third pipe 13 into the first pipe 4, mixing with the purified water already in the first pipe 4. Figure 3 As shown, the raw water source flows upstream of the second filter device 2 through the first filter device 1 and then through the second pipeline 5. After being filtered by the second filter device 2, pure water is formed. At this time, the pure water mixes with the purified water formed by the first filter device 1, and the second filter device 2 is backwashed. Furthermore, the pressure or flow rate of the filtered water formed by the second filter device 2 is adjusted by the pressure regulating component to keep the ratio of pure water to purified water in the mixture within a preset range.

[0089] In conjunction with the first aspect, the mixing ratio of the filtered water generated by the first filtration device 1 and the filtered water generated by the second filtration device 2 is 2:1 to 1:2.

[0090] Existing technologies use separate pure water backwashing, which consumes excessive amounts of pure water, requiring larger water storage tanks for pure water support, which is detrimental to the design of water purifiers. This application, however, uses simultaneous backwashing with both purified and pure water, reducing the risk of clogging of the non-woven fabric support layer of the filter membrane in the second filtration device 2 due to excessive colloid content in the purified water during backwashing, thus minimizing the reduction in filter membrane performance.

[0091] Because the purified water has a high colloid content, it is difficult to remove the clogging from the non-woven fabric support layer of the filter membrane in the second filter device 2 during backwashing, which will reduce the performance of the filter membrane in the second filter device 2. Backwashing with pure water alone consumes too much pure water, requiring a larger water storage tank 16 for pure water support, resulting in large space occupation, high cost, and being detrimental to the design of the water purifier. However, by using the method provided in this embodiment, backwashing the second filter device 2 with both purified and pure water simultaneously can reduce the colloid content of the liquid used for backwashing the second filter device 2, thereby improving the clogging removal efficiency of the non-woven fabric support layer of the filter membrane in the second filter device 2, avoiding damage to the performance of the filter membrane in the second filter device 2, and simplifying the piping and reducing production costs.

[0092] The pressure regulating assembly includes a pressure regulating valve 14 and a measuring element 15. The pressure setting range of the pressure regulating valve 14 is 10-20 psi. The measuring element 15 is used to monitor the pressure or flow rate of simultaneous backwashing with pure water and purified water. In this embodiment, the measuring element 15 is a pressure sensor to monitor the pressure of simultaneous backwashing with pure water and purified water. The preferred backwashing pressure value P2 is set to 25-30 psi. The opening of the valve 32 is adjusted by comparing the current pressure value with a pressure threshold to ensure that the backwashing pressure does not exceed 30 psi.

[0093] As an feasible approach, the rinsing ratio of clean water and pure water in the mixed flow can be controlled by adjusting the pressure regulating valve 14.

[0094] Preferably, the rinsing ratio of purified water to pure water can be set to 2:1 to 1:2.

[0095] In conjunction with the first aspect, the backwashing water purification system also includes a control mechanism, which is electrically connected to the regulating component 3. This improves automation and reduces manual control costs.

[0096] Specifically, the detection element 31 transmits the monitored pressure or flow rate data of the purified water to the controller. The controller generates a control signal to control the valve 32 to adjust its opening and closing angle, thereby regulating the pressure or flow rate of the backwash purified water. Through the coordinated action of the detection element 31 and the valve 32, the backwash pressure of the purified water on the second filter device 2 can be better controlled, thus protecting the second filter device from damage.

[0097] Example 3

[0098] A second aspect of this application provides a control method for a backwash water purification system, applied to a controller in the backwash water purification system provided in Examples 1 and 2, in conjunction with... Figure 4 As shown, the method includes:

[0099] S110, acquire detection data, including the pressure or flow rate of the filtered water in the first pipeline.

[0100] S120 controls the regulating component to adjust the pressure value or flow value of the filtered water in the first pipeline based on the comparison relationship between the detection data and a preset first threshold.

[0101] Combined with the second aspect, the regulating component 3 includes a valve 32; the step of controlling the regulating component 3 to adjust the pressure value or flow value of the filtered water in the first pipeline 4 based on the comparison relationship between the detection data and a preset first threshold includes:

[0102] If M < M0, control the valve to increase the opening degree.

[0103] If M = M0, control the valve to maintain the current opening degree.

[0104] If M > M0, control the valve to decrease the opening degree.

[0105] [[ID=,16]]Where M is the detection data and M0 is the preset first threshold.

[0106] When the monitoring data exceeds the first threshold, it needs to be reduced to avoid damaging the second filtering device 2 due to excessive backwash water flow or water pressure. When the monitoring data is less than the first threshold, it is necessary to increase the backwash water flow or water pressure to avoid insufficient water flow or water pressure and unable to achieve a good backwash effect. Through the above automatic control, the automatic cleaning ability and control accuracy can be improved. In this embodiment, the valve 32 is a solenoid valve. Controlling the opening and closing angle of the solenoid valve by a controller is a relatively mature technology, which is convenient to apply, has high control accuracy and high automation degree to obtain a better backwash effect.

[0107] Combined with the second aspect, the backwash water purification system further includes a third pipeline 13, and the third pipeline is connected with a pressure regulating component for adjusting the pressure or flow of the filtered water formed by the second filtering device 2; the method further includes:

[0108] Obtain the first data of the filtered water formed by the first filtering device and the second data of the filtered water formed by the second filtering device;

[0109] Calculate the ratio of the first data to the second data.

[0110] In the case where the ratio is less than a preset second threshold, control the pressure regulating component to decrease the opening degree to reduce the second data of the filtered water formed by the second filtering device.

[0111] In the case where the ratio is greater than a preset third threshold, control the pressure regulating component to increase the opening degree to increase the second data of the filtered water formed by the second filtering device.

[0112] Where the second threshold is less than the third threshold.

[0113] In this embodiment, the pressure regulating component is also a solenoid valve, specifically pressure regulating valve 14. By monitoring the ratio of purified water to pure water, the opening and closing degree of pressure regulating valve 14 on the third pipeline 13 is controlled to ensure a suitable ratio of purified water to pure water. Simultaneous backwashing with both purified and pure water reduces the risk of clogging of the membrane's non-woven fabric support layer during backwashing due to excessive colloid content in the purified water, thus minimizing the reduction in membrane performance. Based on the above example, in this embodiment, the second threshold is 1:2, or 0.5; the third threshold is 2:1, or 2.

[0114] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working process of the system and apparatus described above can be referred to the corresponding process in the foregoing method embodiments, and will not be repeated here.

[0115] Furthermore, in the description of the embodiments of the present invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in the present invention based on the specific circumstances.

[0116] If the aforementioned functions are implemented as software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this invention, essentially, or the part that contributes to the prior art, or a portion of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0117] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, 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 the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0118] Finally, it should be noted that the above embodiments are merely specific implementations of the present invention, used to illustrate the technical solutions of the present invention, and not to limit it. The scope of protection of the present invention is not limited thereto. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that any person skilled in the art can still modify or easily conceive of changes to the technical solutions described in the foregoing embodiments within the technical scope disclosed in the present invention, or make equivalent substitutions for some of the technical features; and these modifications, changes, or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be covered within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A backwashing water purification system, characterized in that, The backwashing water purification system includes: a first filtering device, a second filtering device, and an adjusting component; The output end of the first filtering device is connected to the downstream of the second filtering device through a first pipeline, and the output end of the first filtering device is connected to the upstream of the second filtering device through a second pipeline. The filtered water formed by the first filtering device is mixed with the filtered water formed by the second filtering device, and is also used to backwash the second filtering device; The first pipeline is connected with an adjusting component for adjusting the pressure or flow rate of the filtered water formed by the first filtering device, so that the ratio of the filtered water formed by the first filtering device to the filtered water formed by the second filtering device in the mixed water is maintained at 2:1 to 1:

2. The adjusting component includes: a detecting part and a valve; the detecting part is connected to the first pipeline and close to the output end of the first pipeline for detecting the flow rate or pressure of the filtered water in the first pipeline; the valve is connected to the first pipeline, and adjusts the flow rate or pressure of the filtered water in the first pipeline by adjusting the opening angle of the valve; The control mechanism is electrically connected to the adjusting component for dynamically adjusting the adjusting component according to the detection data; The system further includes: A third pipeline, one end of which is communicated with the first pipeline, and the other end is communicated with the downstream of the second filtering device; a water storage tank is arranged on the third pipeline, and the water storage tank is used for storing the filtered water formed by the second filtering device; A pressure regulating component is arranged on the third pipeline for regulating the pressure or flow rate of the filtered water in the third pipeline.

2. The backwashing water purification system according to claim 1, characterized in that, After the first filtering device forms filtered water to backwash the second filtering device for a first period of time, the first filtering device forms filtered water to flush the second filtering device forward, and while the first filtering device prepares pure water, it discharges the backwashed pure water.

3. A control method for a backwashing water purification system, characterized in that, A controller applied to the backwashing water purification system according to any one of claims 1-2, the method includes: Obtain detection data, where the detection data includes the pressure value or flow rate value of the filtered water in the first pipeline; Based on the comparison relationship between the detection data and a preset first threshold, control the adjusting component to adjust the pressure value or flow rate value of the filtered water in the first pipeline.

4. The method according to claim 3, characterized in that, The adjusting component includes a valve; the step of controlling the adjusting component to adjust the pressure value or flow rate value of the filtered water in the first pipeline based on the comparison relationship between the detection data and a preset first threshold includes: If M < M0, control the valve to increase the opening; If M = M0, control the valve to maintain the current opening; If M > M0, control the valve to decrease the opening; Where M is the detection data and M0 is the preset first threshold.

5. The method according to claim 3, characterized in that, The backwashing water purification system further includes a third pipeline, and a pressure regulating component is arranged on the third pipeline for regulating the pressure or flow rate of the filtered water in the third pipeline; The method further includes: Obtain the first data of the filtered water in the first pipeline and the second data of the filtered water in the third pipeline; the first data and the second data are the pressure value or flow rate value of the filtered water in the pipeline; Calculate the ratio of the first data to the second data; If the ratio is less than a preset second threshold, the pressure regulating component is controlled to reduce its opening to reduce the second data of the filtered water in the third pipeline; If the ratio is greater than a preset third threshold, the pressure regulating component is controlled to increase its opening to increase the second data of the filtered water in the third pipeline; Wherein, the second threshold is less than the third threshold.

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