Method, system and electronic device for adjusting desalination rate of water purification equipment and storage medium

Abstract

The application discloses a desalination rate adjusting method and system of a water purification device, an electronic device and a storage medium, the water purification device comprising a nanofiltration device, a magnetic field coil being arranged outside the nanofiltration device, the desalination rate adjusting method comprising: obtaining a current desalination rate and a target desalination rate of the water purification device; determining whether the current desalination rate reaches the target desalination rate, and if not, adjusting the voltage and / or the magnetic field direction of the magnetic field coil so that the current desalination rate reaches the target desalination rate. The application sets the magnetic field coil outside the nanofiltration device of the water purification device, and adjusts the concentration of ions in front of the nanofiltration membrane in the nanofiltration device by adjusting the voltage and / or the magnetic field direction of the magnetic field coil when the current desalination rate does not reach the target desalination rate, so that the current desalination rate reaches the target desalination rate, the desalination rate of the water purification device can be simply and quickly adjusted, and the efficiency of the desalination rate adjustment is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of water purification equipment, and in particular to a desalination rate adjusting method and system for a water purification equipment, an electronic device and a storage medium. BACKGROUND

[0002] For a water purification equipment, if a reverse osmosis membrane is used, all ions and other impurities in the water quality are removed, which is undoubtedly safe, but is actually not beneficial to health. In addition, although a nanofiltration water purification equipment retains part of the mineral ions, the basic water path of the nanofiltration membrane leads to a fixed desalination rate, which is a one-size-fits-all mode for different water qualities of different hardness in different regions of the country, and cannot meet the different needs of different water quality regions. Although there are other solutions, such as combining membranes with different desalination rates together to adjust the desalination rate by adjusting the water output of different membranes, which requires redundant nanofiltration, resulting in high cost and large size, and the water path is also relatively complex. There is also a method of adjusting the desalination rate by adjusting the ratio of nanofiltration membrane water purification wastewater, which can adjust the desalination rate of the water output, but has a greater impact on the water output flow, and the adjustment range is relatively small, the adjustment efficiency is low, and it is difficult to meet the needs of different regions with large differences in hardness. SUMMARY

[0003] The technical problem to be solved by the present application is to overcome the low adjustment efficiency of the desalination rate adjusting method of the existing water purification equipment, and to provide a desalination rate adjusting method, system, electronic device and storage medium for a water purification equipment.

[0004] The present application solves the above technical problems by the following technical solutions:

[0005] The present application provides a desalination rate adjusting method for a water purification equipment, the water purification equipment comprising a nanofiltration device, a magnetic field coil being arranged outside the nanofiltration device, the desalination rate adjusting method comprising:

[0006] obtaining a current desalination rate and a target desalination rate of the water purification equipment;

[0007] determining whether the current desalination rate reaches the target desalination rate, and if not, adjusting the voltage and / or magnetic field direction of the magnetic field coil so that the current desalination rate reaches the target desalination rate.

[0008] Preferably, in the case where the voltage of the magnetic field coil is adjusted to the upper limit voltage of the magnetic field coil and the current desalination rate has not reached the target desalination rate, the desalination rate adjusting method further comprises:

[0009] adjusting the opening degree of the adjustable valve of the wastewater outlet of the nanofiltration device so that the current desalination rate reaches the target desalination rate.

[0010] Preferably, in the case that the current desalination rate has not reached the target desalination rate, the voltage of the magnetic field coil is adjusted to the upper limit voltage of the magnetic field coil, and the opening of the adjustable valve of the wastewater outlet of the nanofiltration device is adjusted to the maximum opening, and the desalination rate adjusting method further comprises:

[0011] Adjusting the voltage of the booster pump in the water purification device so that the current desalination rate reaches the target desalination rate.

[0012] Preferably, the step of adjusting the voltage of the magnetic field coil and / or the direction of the magnetic field so that the current desalination rate reaches the target desalination rate comprises:

[0013] Obtaining the previous desalination rate;

[0014] Calculating the voltage adjustment value of the magnetic field coil according to the current desalination rate, the target desalination rate, and the previous desalination rate;

[0015] Determining whether the current desalination rate is greater than the target desalination rate, if yes, positively adjusting the magnetic field coil and / or adjusting the voltage of the magnetic field coil according to the voltage adjustment value of the magnetic field coil so that the current desalination rate reaches the target desalination rate; if no, negatively adjusting the magnetic field coil and / or adjusting the voltage of the magnetic field coil according to the voltage adjustment value of the magnetic field coil so that the current desalination rate reaches the target desalination rate.

[0016] Preferably, the step of obtaining the current desalination rate of the water purification device comprises:

[0017] Detecting the actual water inlet ion concentration value and the actual water outlet ion concentration value of the nanofiltration device;

[0018] Calculating the current desalination rate according to the actual water inlet ion concentration value and the actual water outlet ion concentration value;

[0019] And / or,

[0020] The step of obtaining the target desalination rate of the water purification device comprises:

[0021] Detecting the actual water inlet ion concentration value of the nanofiltration device;

[0022] Obtaining the target water outlet ion concentration value of the nanofiltration device;

[0023] Calculating the target desalination rate according to the actual water inlet ion concentration value and the target water outlet ion concentration value.

[0024] Preferably, the step of adjusting the opening of the adjustable valve at the wastewater outlet of the nanofiltration device to achieve the target desalination rate includes:

[0025] Obtain the previous desalination rate and the previous two desalination rates;

[0026] The opening adjustment value of the adjustable valve at the wastewater outlet of the nanofiltration device is calculated based on the previous desalination rate, the previous two desalination rates, and the target desalination rate.

[0027] Adjust the opening of the adjustable valve at the wastewater outlet of the nanofiltration device according to the opening adjustment value, so that the current desalination rate reaches the target desalination rate.

[0028] Preferably, the step of adjusting the voltage of the booster pump in the water purification equipment to achieve the target desalination rate includes:

[0029] Obtain the current outflow rate, target outflow rate, previous outflow rate, and the outflow rates of the two previous outflow rates;

[0030] The voltage adjustment value of the booster pump is calculated based on the current water flow rate, the target water flow rate, the previous water flow rate, and the previous two water flow rates.

[0031] Adjust the voltage of the booster pump according to the voltage regulation value of the booster pump so that the current desalination rate reaches the target desalination rate.

[0032] The second aspect of the present invention provides a desalination rate adjustment system for a water purification device, the water purification device including a nanofiltration device, a magnetic field coil being disposed outside the nanofiltration device, and the desalination rate adjustment system including an acquisition module, a judgment module and a first adjustment module;

[0033] The acquisition module is used to acquire the current desalination rate and target desalination rate of the water purification equipment;

[0034] The judgment module is used to determine whether the current desalination rate has reached the target desalination rate. If not, the first adjustment module is invoked.

[0035] The first adjustment module is used to adjust the voltage and / or magnetic field direction of the magnetic field coil so that the current desalination rate reaches the target desalination rate.

[0036] Preferably, when the voltage of the magnetic field coil is adjusted to the upper limit voltage of the magnetic field coil and the current desalination rate has not yet reached the target desalination rate, the desalination rate adjustment system further includes a second adjustment module;

[0037] The second adjustment module is used to adjust the opening of the adjustable valve at the wastewater outlet of the nanofiltration device so that the current desalination rate reaches the target desalination rate.

[0038] Preferably, when the voltage of the magnetic field coil is adjusted to the upper limit voltage of the magnetic field coil, and the opening of the adjustable valve of the wastewater outlet of the nanofiltration device is adjusted to the maximum opening, and the current desalination rate has not yet reached the target desalination rate, the desalination rate adjustment system further includes a third adjustment module.

[0039] The third adjustment module is used to adjust the voltage of the booster pump in the water purification equipment so that the current desalination rate reaches the target desalination rate.

[0040] Preferably, the first adjustment module includes a first acquisition unit, a first calculation unit, a judgment unit, a first adjustment unit, and a second adjustment unit;

[0041] The first acquisition unit is used to acquire the previous desalination rate;

[0042] The first calculation unit is used to calculate the voltage adjustment value of the magnetic field coil based on the current desalination rate, the target desalination rate, and the previous desalination rate;

[0043] The judgment unit is used to determine whether the current desalination rate is greater than the target desalination rate. If yes, the first adjustment unit is invoked; if no, the second adjustment unit is invoked.

[0044] The first adjustment unit is used to positively adjust the magnetic field coil and / or adjust the voltage of the magnetic field coil according to the voltage adjustment value of the magnetic field coil, so that the current desalination rate reaches the target desalination rate;

[0045] The second adjustment unit is used to reverse the adjustment of the magnetic field coil and / or adjust the voltage of the magnetic field coil according to the voltage adjustment value of the magnetic field coil, so that the current desalination rate reaches the target desalination rate.

[0046] Preferably, the acquisition module includes a first detection unit and a second calculation unit;

[0047] The first detection unit is used to detect the actual influent ion concentration value and the actual effluent ion concentration value of the nanofiltration device;

[0048] The second calculation unit is used to calculate the current desalination rate based on the actual influent ion concentration value and the actual effluent ion concentration value;

[0049] And / or,

[0050] The acquisition module further includes a second detection unit, a second acquisition unit, and a third calculation unit;

[0051] The second detection unit is used to detect the actual influent ion concentration value of the nanofiltration device;

[0052] The second acquisition unit is used to acquire the target ion concentration value of the effluent from the nanofiltration device;

[0053] The third calculation unit is used to calculate the target desalination rate based on the actual influent ion concentration value and the target effluent ion concentration value.

[0054] Preferably, the second adjustment module includes a third acquisition unit, a fourth calculation unit, and a third adjustment unit;

[0055] The third acquisition unit is used to acquire the previous desalination rate and the previous two desalination rates;

[0056] The fourth calculation unit is used to calculate the opening adjustment value of the adjustable valve at the wastewater outlet of the nanofiltration device based on the previous desalination rate, the previous two desalination rates, and the target desalination rate.

[0057] The third adjustment unit is used to adjust the opening of the adjustable valve at the wastewater outlet of the nanofiltration device according to the opening adjustment value, so that the current desalination rate reaches the target desalination rate.

[0058] Preferably, the third adjustment module includes a fourth acquisition unit, a fifth calculation unit, and a fourth adjustment unit;

[0059] The fourth acquisition unit is used to acquire the current water flow rate, the target water flow rate, the previous water flow rate, and the water flow rates of the previous two times.

[0060] The fifth calculation unit is used to calculate the voltage adjustment value of the booster pump based on the current water flow rate, the target water flow rate, the previous water flow rate, and the previous two water flow rates.

[0061] The fourth adjustment unit is used to adjust the voltage of the booster pump according to the voltage adjustment value of the booster pump, so that the current desalination rate reaches the target desalination rate.

[0062] A third aspect of the present invention provides an electronic device, including a memory, a processor, and a computer program stored in the memory and for running on the processor, wherein the processor executes the computer program to implement the desalination rate adjustment method of the water purification device as described in the first aspect.

[0063] A fourth aspect of the present invention provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the desalination rate adjustment method of the water purification device as described in the first aspect.

[0064] Based on common knowledge in the field, the above-mentioned preferred conditions can be combined arbitrarily to obtain various preferred embodiments of the present invention.

[0065] The positive and progressive effects of this invention are as follows:

[0066] This invention involves setting a magnetic field coil outside the nanofiltration device of a water purification system. When the current desalination rate has not reached the target desalination rate, the concentration of ions in front of the nanofiltration membrane in the nanofiltration system can be adjusted by adjusting the voltage and / or direction of the magnetic field coil, thereby enabling the current desalination rate to reach the target desalination rate. This invention provides a simple and quick way to adjust the desalination rate of the water purification system, improving the efficiency of desalination rate adjustment. Attached Figure Description

[0067] Figure 1 This is a schematic diagram of the water purification equipment in Embodiments 1 and 2 of the present invention.

[0068] Figure 2 This is a flowchart of the desalination rate adjustment method of the water purification equipment in Embodiment 1 of the present invention.

[0069] Figure 3 This is a schematic diagram of the desalination rate adjustment system of the water purification equipment in Embodiment 2 of the present invention.

[0070] Figure 4 This is a schematic diagram of the electronic device used to implement the desalination rate adjustment method of the water purification equipment in Embodiment 3 of the present invention. Detailed Implementation

[0071] The present invention will be further illustrated by way of embodiments below, but the present invention is not limited to the scope of the embodiments described herein.

[0072] Example 1

[0073] This embodiment provides a method for adjusting the desalination rate of a water purification device, such as... Figure 1 As shown, the water purification equipment includes a nanofiltration unit, sensors TDS1 and TDS2, PP cotton, a booster pump, an adjustable valve, post-activated carbon, and a flow meter. The nanofiltration unit has an external magnetic field coil. It should be noted that the actual ion concentration of the effluent from the nanofiltration unit can be detected by sensor TDS2, the actual ion concentration of the influent can be detected by sensor TDS1, and the flow rate of the purified water from the nanofiltration unit's outlet can be detected by the flow meter. Figure 2 As shown, the desalination rate adjustment method includes:

[0074] Step 101: Obtain the current desalination rate and target desalination rate of the water purification equipment;

[0075] Step 102: Determine whether the current desalination rate has reached the target desalination rate. If not, proceed to step 103; if yes, end the process.

[0076] Step 103: Adjust the voltage and / or magnetic field direction of the magnetic field coil to achieve the target desalination rate.

[0077] In this embodiment, the influent undergoes primary filtration through PP cotton, and after being pressurized by a booster pump, it enters the nanofiltration device. After exiting the nanofiltration device, it enters the post-activated carbon filter, and then flows to the outlet.

[0078] Specifically, sensors TDS1 and TDS2 are installed before and after the nanofiltration unit, respectively. A flow meter is installed after the nanofiltration unit. An adjustable valve is installed at the wastewater outlet of the nanofiltration unit to regulate the wastewater flow rate. A magnetic field coil is wound around the outside of the filter element of the nanofiltration unit to form a magnetic field. The electric field drives ions to approach or move away from the nanofiltration membrane (for example, by adjusting the voltage and / or direction of the magnetic field coil to make ions approach or move away from the nanofiltration membrane). That is, the ion concentration in front of the nanofiltration membrane is adjusted, which can indirectly regulate the desalination rate. Within a certain range, the desalination rate can be changed while keeping the outflow rate constant.

[0079] This embodiment sets up a magnetic field coil outside the nanofiltration device of the water purification equipment. When the current desalination rate has not reached the target desalination rate, the concentration of ions in front of the nanofiltration membrane in the nanofiltration device is adjusted by adjusting the voltage and / or magnetic field direction of the magnetic field coil, thereby enabling the current desalination rate to reach the target desalination rate. This allows for simple and quick adjustment of the desalination rate of the water purification equipment, improving the efficiency of desalination rate adjustment.

[0080] As an optional implementation, when the voltage of the magnetic field coil is adjusted to the upper limit voltage of the magnetic field coil, but the current desalination rate has not yet reached the target desalination rate, the desalination rate adjustment method further includes:

[0081] Step 201: Adjust the opening of the adjustable valve at the wastewater outlet of the nanofiltration device to achieve the target desalination rate.

[0082] In practical implementation, when adjusting the magnetic field coil, if the voltage adjustment value of the magnetic field coil obtained according to the PID control algorithm remains at the maximum voltage (i.e., the upper limit voltage of the magnetic field coil), and the current desalination rate has not yet reached the target desalination rate, it indicates that the voltage of the magnetic field coil has reached its maximum value, but the desalination rate is insufficient. Therefore, it is necessary to consider adjusting the adjustable valve at the wastewater outlet. At this time, the control of the adjustable valve at the wastewater outlet is activated. However, before starting the control of the adjustable valve at the wastewater outlet, a data limit needs to be set (e.g., to maintain a 2:1 ratio between the effluent flow rate and the wastewater flow rate for first-class water efficiency). The purpose is to prevent excessive wastewater and insufficient effluent flow, thus ensuring water efficiency.

[0083] As an optional implementation, when the voltage of the magnetic field coil is adjusted to the upper limit voltage of the magnetic field coil, and the opening of the adjustable valve at the wastewater outlet of the nanofiltration device is adjusted to the maximum opening, and the current desalination rate has not yet reached the target desalination rate, the desalination rate adjustment method further includes:

[0084] Step 301: Adjust the voltage of the booster pump in the water purification equipment so that the current desalination rate reaches the target desalination rate.

[0085] In this embodiment, the desalination rate of the effluent can be significantly adjusted by regulating the magnetic field coil and the adjustable valve at the wastewater outlet. Furthermore, PID feedback control is implemented in real-time using TDS2 data from the sensor. However, in high-hardness areas, due to the very high influent TDS1 and the relatively low target effluent TDS2, adjusting only the magnetic field coil and the adjustable valve at the wastewater outlet is insufficient to meet the desalination rate requirements. Therefore, if the desalination rate has not yet reached the target rate even after adjusting the magnetic field coil voltage to its upper limit and the adjustable valve at the wastewater outlet of the nanofiltration unit to its maximum opening, the voltage of the booster pump needs to be adjusted for control.

[0086] As an optional implementation, step 103 includes:

[0087] Step 1031: Obtain the previous desalination rate;

[0088] Step 1032: Calculate the voltage adjustment value of the magnetic field coil based on the current desalination rate, the target desalination rate, and the previous desalination rate;

[0089] In this embodiment, the voltage adjustment value of the magnetic field coil is obtained by formula (1):

[0090] ΔU1(t)=Kp1*e(t)+Ki1*∑e(t)+Kd1*(e(t)-e(t-1))(1)

[0091] Wherein, ΔU1(t) represents the voltage adjustment value of the magnetic field coil; e(t) represents the difference between the current desalination rate and the target desalination rate, i.e., e(t) = δ0 – δ1, where δ0 represents the target desalination rate and δ1 represents the current desalination rate; e(t-1) represents the difference between the previous desalination rate and the target desalination rate, i.e., e(t-1) = δ0 – δ2, where δ2 represents the previous desalination rate; Kp1, Ki1, and Kd1 are all adjustable parameters. It should be noted that, usually Kp1 = 10 * Ki1; Kp1 = 5 * Kd1; in addition, when ΔU1(t) is positive, it indicates that the magnetic field coil is adjusted in the forward direction, and when ΔU1(t) is negative, it indicates that the magnetic field coil is adjusted in the reverse direction.

[0092] Step 1033: Determine whether the current desalination rate is greater than the target desalination rate. If yes, proceed to step 1034; otherwise, proceed to step 1035.

[0093] Step 1034: Adjust the magnetic field coil in the positive direction and / or adjust the voltage of the magnetic field coil according to the voltage adjustment value of the magnetic field coil so that the current desalination rate reaches the target desalination rate;

[0094] Step 1035: Adjust the magnetic field coil in the reverse direction and / or adjust the voltage of the magnetic field coil according to the voltage adjustment value of the magnetic field coil so that the current desalination rate reaches the target desalination rate.

[0095] As an optional implementation, step 101, which involves obtaining the current desalination rate of the water purification equipment, includes:

[0096] Steps 101-11: Detect the actual influent ion concentration and the actual effluent ion concentration of the nanofiltration device;

[0097] In this embodiment, the actual influent ion concentration of the nanofiltration device is detected by sensor TDS1, and the actual effluent ion concentration of the nanofiltration device is detected by sensor TDS2.

[0098] Steps 101-12: Calculate the current desalination rate based on the actual influent ion concentration and the actual effluent ion concentration.

[0099] In this embodiment, the current desalination rate is obtained through formula (2):

[0100] δ1=(TDS2-TDS1) / TDS1(2)

[0101] Wherein, TDS1 represents the actual influent ion concentration value; TDS2 represents the actual effluent ion concentration value.

[0102] As an optional implementation, step 101 of obtaining the target desalination rate of the water purification equipment includes:

[0103] Steps 101-21: Detect the actual influent ion concentration of the nanofiltration device;

[0104] Steps 101-22: Obtain the target ion concentration value of the effluent from the nanofiltration device;

[0105] Steps 101-23: Calculate the target desalination rate based on the actual influent ion concentration and the target effluent ion concentration.

[0106] In this embodiment, the target desalination rate is obtained through formula (3):

[0107] δ0=(T0-TDS1) / TDS1(3)

[0108] Where T0 represents the target ion concentration value in the effluent.

[0109] As an optional implementation, step 201 includes:

[0110] Step 2011: Obtain the previous desalination rate and the previous two desalination rates;

[0111] Step 2012: Calculate the opening adjustment value of the adjustable valve at the wastewater outlet of the nanofiltration unit based on the previous desalination rate, the previous two desalination rates, and the target desalination rate.

[0112] Step 2013: Adjust the opening of the adjustable valve at the wastewater outlet of the nanofiltration device according to the opening adjustment value so that the current desalination rate reaches the target desalination rate.

[0113] In this embodiment, incremental PID is used to adjust the adjustable valve at the wastewater outlet, and the opening adjustment value of the adjustable valve is obtained by formula (4):

[0114] ΔU2(t)=Kp2*(e(t)-e(t-1))+Ki2*e(t)+Kd2*(e(t)-2*e(t-1)+e(t-2))(4)

[0115] Wherein, ΔU2(t) represents the adjustment value of the adjustable valve at the wastewater outlet of the nanofiltration unit, that is, the adjustment of the adjustable valve opening. When ΔU2(t) is positive, it means to increase the adjustable valve opening, and when ΔU2(t) is negative, it means to decrease the adjustable valve opening; e(t) represents the difference between the current desalination rate and the target desalination rate, that is, e(t) = δ0 – δ1, where δ0 represents the target desalination rate and δ1 represents the current desalination rate; e(t-1) represents the difference between the previous desalination rate and the target desalination rate, that is, e(t-1) = δ0 – δ2, where δ2 represents the previous desalination rate; e(t-2) represents the difference between the previous two desalination rates and the target desalination rate, that is, e(t-2) = δ0 – δ3, where δ3 represents the previous two desalination rates; Kp2, Ki2, and Kd2 are all adjustable parameters;

[0116] Additionally, Kp2 = ΔDes / ΔOpe, ΔDes = Des[n] - Des[n-1], where Des[n] represents the desalination rate greater than the target desalination rate, and Des[n-1] represents the desalination rate less than the target desalination rate; ΔOpe = Ope[n] - Ope[n-1], where Ope[n] and Ope[n-1] are the openings corresponding to Des[n] and Des[n-1], respectively.

[0117] As an optional implementation, step 301 includes:

[0118] Step 3011: Obtain the current outflow rate, target outflow rate, previous outflow rate, and the outflow rates of the previous two times;

[0119] Step 3012: Calculate the voltage adjustment value of the booster pump based on the current water flow rate, the target water flow rate, the previous water flow rate, and the previous two water flow rates.

[0120] Step 3013: Adjust the voltage of the booster pump according to the voltage adjustment value of the booster pump so that the current desalination rate reaches the target desalination rate.

[0121] In this embodiment, incremental PID is used to regulate the voltage of the booster pump, and the voltage regulation value of the booster pump is obtained by formula (5):

[0122] ΔU3(t)=Kp3*(e(t)-e(t-1))+Ki3*e(t)+Kd3*(e(t)-2*e(t-1)+e(t-2))(5)

[0123] Wherein, ΔU3(t) represents the voltage adjustment value of the booster pump, that is, the adjustment magnitude of the booster pump voltage. When ΔU3(t) is positive, it means increasing the booster pump voltage; when ΔU3(t) is negative, it means decreasing the booster pump voltage. e(t) represents the difference between the current effluent flow rate and the target effluent flow rate, that is, e(t) = Fobject - Fsensor, where Fobject represents the target effluent flow rate and Fsensor represents the current effluent flow rate. e(t-1) represents the difference between the previous effluent flow rate and the target effluent flow rate; e(t-2) represents the difference between the effluent flow rate and the target effluent flow rate of the previous two effluent flows. Kp3 is benchmarked against the calibration data and compared with the desalination rate PI of the wastewater adjustable valve. The D parameters are similar. The recorded data is Flow[n]≥Fobject≥Flow[n-1] (before adjusting the booster pump). ΔF=Flow[n]-Flow[n-1], where ΔF represents the difference between the current and previous water flow rates, Flow[n] represents the current water flow rate, and Flow[n-1] represents the previous water flow rate. Voltage ΔV=V[n]-V[n-1], where ΔV represents the difference between the booster pump's voltage adjustment values, V[n] represents the current booster pump's voltage adjustment value, and V[n-1] represents the previous booster pump's voltage adjustment value. Kp3=ΔV / ΔF; Kp3, Ki3, and Kd3 are all adjustable parameters.

[0124] It should be noted that the voltage adjustment of the booster pump is related to the magnetic field strength of the magnetic field coil. Desalination relies on the magnetic field of the magnetic field coil, which depends on both the strength of the magnetic field and the speed of the water flow. The faster the water flow, the shorter the time it takes to pass through the magnetic field coil, and the worse the effect. Therefore, once the adjustable valve at the wastewater outlet reaches its limit position and still cannot meet the desalination rate requirements, the voltage of the booster pump will be adjusted. However, the adjustment of the booster pump voltage affects the water flow rate, which is very intuitive for users, so large and rapid adjustments cannot be made.

[0125] In addition, before adjusting the booster pump, since the current desalination rate has reached the target desalination rate, the voltage of the magnetic field coil and the opening of the adjustable valve are at their maximum values. When adjusting the water flow rate by the booster pump, once overshoot occurs, exceeding the target value, the magnetic field coil at its maximum value will give priority to feedback, and the target balance value will be reached after PID control.

[0126] After adjusting the voltage of the booster pump to achieve the target desalination rate, if the voltage of the magnetic field coil is not at its upper limit, the adjustable valve at the wastewater outlet is gradually reduced. As the opening of the adjustable valve at the wastewater outlet gradually decreases, the desalination rate adjustment effect through the adjustable valve at the wastewater outlet weakens, resulting in an increase in the PID data controlling the magnetic field coil, that is, an increase in the magnetic field strength of the magnetic field coil. This stabilizes the desalination rate and maintains the minimum wastewater and maximum effluent flow rate.

[0127] By controlling the magnetic field coil, the adjustable valve at the wastewater outlet, and the booster pump to varying degrees, the current desalination rate can reach the target desalination rate, while maintaining minimum wastewater and maximum flow rate.

[0128] In the specific implementation process, the water flow velocity of the booster pump is measured by connecting a high-ion-concentration solution to the inlet, starting the booster pump, and manually adjusting the adjustable valve at the wastewater outlet to maintain a 2:1 ratio between the outflow and wastewater flow rates for first-class water efficiency (tentatively set as the limit target for the adjustable valve at the wastewater outlet). The water flow velocity is adjusted by regulating the voltage of the booster pump, and the outflow rate is detected by the data fed back from the flow meter. The outflow rate at different voltages is recorded as a reference for subsequent control.

[0129] To adjust the magnetic field coil, connect a high-ion-concentration solution to the inlet, start the booster pump, and manually adjust the adjustable valve at the wastewater outlet to maintain a 2:1 ratio between the outflow and wastewater flow rates for first-class water efficiency. At this time, gradually adjust the voltage of the magnetic field coil from low to high to gradually increase the magnetic field strength during the water discharge process. Record the voltage after each adjustment and the desalination rate at different voltages. This data can be used as a reference for subsequent control.

[0130] To adjust the adjustable valve at the wastewater outlet, connect a high-ion-concentration solution to the inlet, start the booster pump, and without activating the magnetic field coil, gradually adjust the opening of the adjustable valve at the wastewater outlet from small to large. Record the desalination rate at different openings until the ratio of effluent flow rate to wastewater flow rate is below 2:1 (or it can be set to 1:1 according to the target). Record the opening of the adjustable valve at the wastewater outlet and the desalination rate data. This data can be used as a reference for subsequent control. Record the opening of the adjustable valve at the wastewater outlet when the effluent flow rate and wastewater flow rate are maintained at 2:1. This is the maximum opening of the adjustable valve at the wastewater outlet. Alternatively, the maximum opening can be set when the effluent flow rate and wastewater flow rate are 1:1, depending on the requirements.

[0131] This embodiment achieves rapid adjustment of ion concentration and maintains maximum water efficiency (i.e., maximum effluent and minimum wastewater) and stable effluent flow rate by adjusting parameters in several dimensions, including the magnetic field coil, the opening of the adjustable valve at the wastewater outlet, and the flow rate of the booster pump. While ensuring water efficiency (i.e., within the limits of the adjustable valve opening at the wastewater outlet), priority is given to ensuring the concentration of ion ions in the effluent. First, the magnetic field coil is adjusted using PID control to control the ion concentration. If the range of the magnetic field coil cannot meet the desalination rate requirements, the opening of the adjustable valve at the wastewater outlet is then adjusted using PID control. Finally, the voltage of the booster pump is controlled using PID control to achieve dual regulation of effluent flow rate and ion concentration. The optimal target is achieved through sequential control using different PID controllers. Furthermore, the magnetic field coil adjusts quickly, while the adjustable valve at the wastewater outlet adjusts slowly. The three PID controllers work in rotation, allowing for rapid adjustment of ion concentration (e.g., adjustment using only the magnetic field coil) and a wide adjustment range (e.g., adjustment using a combination of the magnetic field coil and the adjustable valve), while simultaneously achieving stable effluent flow rate and minimal wastewater.

[0132] Example 2

[0133] This embodiment provides a desalination rate adjustment system for a water purification device, such as... Figure 1 As shown, the water purification equipment includes a nanofiltration unit, sensors TDS1 and TDS2, PP cotton, a booster pump, an adjustable valve, post-activated carbon, and a flow meter. The nanofiltration unit has an external magnetic field coil. It should be noted that the actual ion concentration of the effluent from the nanofiltration unit can be detected by sensor TDS2, the actual ion concentration of the influent can be detected by sensor TDS1, and the flow rate of the purified water from the nanofiltration unit's outlet can be detected by the flow meter. Figure 3 As shown, the desalination rate adjustment system includes an acquisition module 21, a judgment module 22, and a first adjustment module 23;

[0134] The acquisition module 21 is used to acquire the current desalination rate and target desalination rate of the water purification equipment;

[0135] The judgment module 22 is used to determine whether the current desalination rate has reached the target desalination rate. If not, the first adjustment module 23 is called; if yes, the process ends.

[0136] The first adjustment module 23 is used to adjust the voltage and / or magnetic field direction of the magnetic field coil so that the current desalination rate reaches the target desalination rate.

[0137] In this embodiment, the influent undergoes primary filtration through PP cotton, and after being pressurized by a booster pump, it enters the nanofiltration device. After exiting the nanofiltration device, it enters the post-activated carbon filter, and then flows to the outlet.

[0138] Specifically, sensors TDS1 and TDS2 are installed before and after the nanofiltration unit, respectively. A flow meter is installed after the nanofiltration unit. An adjustable valve is installed at the wastewater outlet of the nanofiltration unit to regulate the wastewater flow rate. A magnetic field coil is wound around the outside of the filter element of the nanofiltration unit to form a magnetic field. The electric field drives ions to approach or move away from the nanofiltration membrane (for example, by adjusting the voltage and / or direction of the magnetic field coil to make ions approach or move away from the nanofiltration membrane). That is, the ion concentration in front of the nanofiltration membrane is adjusted, which can indirectly regulate the desalination rate. Within a certain range, the desalination rate can be changed while keeping the outflow rate constant.

[0139] This embodiment sets up a magnetic field coil outside the nanofiltration device of the water purification equipment. When the current desalination rate has not reached the target desalination rate, the concentration of ions in front of the nanofiltration membrane in the nanofiltration device is adjusted by adjusting the voltage and / or magnetic field direction of the magnetic field coil, thereby enabling the current desalination rate to reach the target desalination rate. This allows for simple and quick adjustment of the desalination rate of the water purification equipment, improving the efficiency of desalination rate adjustment.

[0140] As an optional implementation, if the voltage of the magnetic field coil is adjusted to the upper limit voltage of the magnetic field coil, but the current desalination rate has not yet reached the target desalination rate, such as... Figure 3 As shown, the desalination rate adjustment system also includes a second adjustment module 24;

[0141] The second adjustment module 24 is used to adjust the opening of the adjustable valve at the wastewater outlet of the nanofiltration device so that the current desalination rate reaches the target desalination rate.

[0142] In practical implementation, when adjusting the magnetic field coil, if the voltage adjustment value of the magnetic field coil obtained according to the PID control algorithm remains at the maximum voltage (i.e., the upper limit voltage of the magnetic field coil), and the current desalination rate has not yet reached the target desalination rate, it indicates that the voltage of the magnetic field coil has reached its maximum value, but the desalination rate is insufficient. Therefore, it is necessary to consider adjusting the adjustable valve at the wastewater outlet. At this time, the control of the adjustable valve at the wastewater outlet is activated. However, before starting the control of the adjustable valve at the wastewater outlet, a data limit needs to be set (e.g., to maintain a 2:1 ratio between the effluent flow rate and the wastewater flow rate for first-class water efficiency). The purpose is to prevent excessive wastewater and insufficient effluent flow, thus ensuring water efficiency.

[0143] As an optional implementation, if the voltage of the magnetic field coil is adjusted to its upper limit and the opening of the adjustable valve at the wastewater outlet of the nanofiltration device is adjusted to its maximum opening, and the current desalination rate has not yet reached the target desalination rate, then... Figure 3 As shown, the desalination rate adjustment system also includes a third adjustment module 25;

[0144] The third adjustment module 25 is used to adjust the voltage of the booster pump in the water purification equipment so that the current desalination rate reaches the target desalination rate.

[0145] In this embodiment, the desalination rate of the effluent can be significantly adjusted by regulating the magnetic field coil and the adjustable valve at the wastewater outlet. Furthermore, PID feedback control is implemented in real-time using TDS2 data from the sensor. However, in high-hardness areas, due to the very high influent TDS1 and the relatively low target effluent TDS2, adjusting only the magnetic field coil and the adjustable valve at the wastewater outlet is insufficient to meet the desalination rate requirements. Therefore, if the desalination rate has not yet reached the target rate even after adjusting the magnetic field coil voltage to its upper limit and the adjustable valve at the wastewater outlet of the nanofiltration unit to its maximum opening, the voltage of the booster pump needs to be adjusted for control.

[0146] As an optional implementation method, such as Figure 3 As shown, the first adjustment module 23 includes a first acquisition unit 231, a first calculation unit 232, a judgment unit 233, a first adjustment unit 234, and a second adjustment unit 235;

[0147] The first acquisition unit 231 is used to acquire the previous desalination rate;

[0148] The first calculation unit 232 is used to calculate the voltage adjustment value of the magnetic field coil based on the current desalination rate, the target desalination rate, and the previous desalination rate;

[0149] In this embodiment, the voltage adjustment value of the magnetic field coil is obtained by formula (1) in embodiment 1.

[0150] The judgment unit 233 is used to determine whether the current desalination rate is greater than the target desalination rate. If so, the first adjustment unit 234 is called; if not, the second adjustment unit 235 is called.

[0151] The first adjustment unit 234 is used to positively adjust the magnetic field coil and / or adjust the voltage of the magnetic field coil according to the voltage adjustment value of the magnetic field coil, so that the current desalination rate reaches the target desalination rate;

[0152] The second adjustment unit 235 is used to reverse adjust the magnetic field coil and / or adjust the voltage of the magnetic field coil according to the voltage adjustment value of the magnetic field coil, so that the current desalination rate reaches the target desalination rate.

[0153] As an optional implementation method, such as Figure 3 As shown, the acquisition module 21 includes a first detection unit 211 and a second calculation unit 212;

[0154] The first detection unit 211 is used to detect the actual influent ion concentration value and the actual effluent ion concentration value of the nanofiltration device.

[0155] In this embodiment, the actual influent ion concentration of the nanofiltration device is detected by sensor TDS1, and the actual effluent ion concentration of the nanofiltration device is detected by sensor TDS2.

[0156] The second calculation unit 212 is used to calculate the current desalination rate based on the actual influent ion concentration value and the actual effluent ion concentration value.

[0157] In this embodiment, the current desalination rate is obtained by formula (2) in Example 1.

[0158] As an optional implementation method, such as Figure 3 As shown, the acquisition module 21 also includes a second detection unit 213, a second acquisition unit 214, and a third calculation unit 215;

[0159] The second detection unit 213 is used to detect the actual influent ion concentration value of the nanofiltration device;

[0160] The second acquisition unit 214 is used to acquire the target ion concentration value of the effluent from the nanofiltration device.

[0161] The third calculation unit 215 is used to calculate the target desalination rate based on the actual influent ion concentration and the target effluent ion concentration.

[0162] In this embodiment, the target desalination rate is obtained by formula (3) in Example 1.

[0163] As an optional implementation method, such as Figure 3 As shown, the second adjustment module 24 includes a third acquisition unit 241, a fourth calculation unit 242, and a third adjustment unit 243;

[0164] The third acquisition unit 241 is used to acquire the previous desalination rate and the previous two desalination rates;

[0165] The fourth calculation unit 242 is used to calculate the opening adjustment value of the adjustable valve at the wastewater outlet of the nanofiltration device based on the previous desalination rate, the previous two desalination rates, and the target desalination rate.

[0166] The third adjustment unit 243 is used to adjust the opening of the adjustable valve at the wastewater outlet of the nanofiltration device according to the opening adjustment value, so that the current desalination rate reaches the target desalination rate.

[0167] In this embodiment, incremental PID is used to adjust the adjustable valve at the wastewater outlet, and the opening adjustment value of the adjustable valve is obtained by formula (4) in embodiment 1.

[0168] As an optional implementation method, such as Figure 3 As shown, the third adjustment module 25 includes a fourth acquisition unit 251, a fifth calculation unit 252, and a fourth adjustment unit 253;

[0169] The fourth acquisition unit 251 is used to acquire the current water flow rate, the target water flow rate, the previous water flow rate, and the water flow rates of the previous two times.

[0170] The fifth calculation unit 252 is used to calculate the voltage regulation value of the booster pump based on the current water flow rate, the target water flow rate, the previous water flow rate, and the previous two water flow rates.

[0171] The fourth adjustment unit 253 is used to adjust the voltage of the booster pump according to the voltage adjustment value of the booster pump, so that the current desalination rate reaches the target desalination rate.

[0172] In this embodiment, incremental PID is used to regulate the voltage of the booster pump, and the voltage regulation value of the booster pump is obtained by formula (5) in embodiment 1.

[0173] It should be noted that the voltage adjustment of the booster pump is related to the magnetic field strength of the magnetic field coil. Desalination relies on the magnetic field of the magnetic field coil, which depends on both the strength of the magnetic field and the speed of the water flow. The faster the water flow, the shorter the time it takes to pass through the magnetic field coil, and the worse the effect. Therefore, once the adjustable valve at the wastewater outlet reaches its limit position and still cannot meet the desalination rate requirements, the voltage of the booster pump will be adjusted. However, the adjustment of the booster pump voltage affects the water flow rate, which is very intuitive for users, so large and rapid adjustments cannot be made.

[0174] In addition, before adjusting the booster pump, since the current desalination rate has reached the target desalination rate, the voltage of the magnetic field coil and the opening of the adjustable valve are at their maximum values. When adjusting the water flow rate by the booster pump, once overshoot occurs, exceeding the target value, the magnetic field coil at its maximum value will give priority to feedback, and the target balance value will be reached after PID control.

[0175] After adjusting the voltage of the booster pump to achieve the target desalination rate, if the voltage of the magnetic field coil is not at its upper limit, the adjustable valve at the wastewater outlet is gradually reduced. As the opening of the adjustable valve at the wastewater outlet gradually decreases, the desalination rate adjustment effect through the adjustable valve at the wastewater outlet weakens, resulting in an increase in the PID data controlling the magnetic field coil, that is, an increase in the magnetic field strength of the magnetic field coil. This stabilizes the desalination rate and maintains the minimum wastewater and maximum effluent flow rate.

[0176] By controlling the magnetic field coil, the adjustable valve at the wastewater outlet, and the booster pump to varying degrees, the current desalination rate can reach the target desalination rate, while maintaining minimum wastewater and maximum flow rate.

[0177] In the specific implementation process, the water flow velocity of the booster pump is measured by connecting a high-ion-concentration solution to the inlet, starting the booster pump, and manually adjusting the adjustable valve at the wastewater outlet to maintain a 2:1 ratio between the outflow and wastewater flow rates for first-class water efficiency (tentatively set as the limit target for the adjustable valve at the wastewater outlet). The water flow velocity is adjusted by regulating the voltage of the booster pump, and the outflow rate is detected by the data fed back from the flow meter. The outflow rate at different voltages is recorded as a reference for subsequent control.

[0178] To adjust the magnetic field coil, connect a high-ion-concentration solution to the inlet, start the booster pump, and manually adjust the adjustable valve at the wastewater outlet to maintain a 2:1 ratio between the outflow and wastewater flow rates for first-class water efficiency. At this time, gradually adjust the voltage of the magnetic field coil from low to high to gradually increase the magnetic field strength during the water discharge process. Record the voltage after each adjustment and the desalination rate at different voltages. This data can be used as a reference for subsequent control.

[0179] To adjust the adjustable valve at the wastewater outlet, connect a high-ion-concentration solution to the inlet, start the booster pump, and without activating the magnetic field coil, gradually adjust the opening of the adjustable valve at the wastewater outlet from small to large. Record the desalination rate at different openings until the ratio of effluent flow rate to wastewater flow rate is below 2:1 (or it can be set to 1:1 according to the target). Record the opening of the adjustable valve at the wastewater outlet and the desalination rate data. This data can be used as a reference for subsequent control. Record the opening of the adjustable valve at the wastewater outlet when the effluent flow rate and wastewater flow rate are maintained at 2:1. This is the maximum opening of the adjustable valve at the wastewater outlet. Alternatively, the maximum opening can be set when the effluent flow rate and wastewater flow rate are 1:1, depending on the requirements.

[0180] This embodiment achieves rapid adjustment of ion concentration and maintains maximum water efficiency (i.e., maximum effluent and minimum wastewater) and stable effluent flow rate by adjusting parameters in several dimensions, including the magnetic field coil, the opening of the adjustable valve at the wastewater outlet, and the flow rate of the booster pump. While ensuring water efficiency (i.e., within the limits of the adjustable valve opening at the wastewater outlet), priority is given to ensuring the concentration of ion ions in the effluent. First, the magnetic field coil is adjusted using PID control to control the ion concentration. If the range of the magnetic field coil cannot meet the desalination rate requirements, the opening of the adjustable valve at the wastewater outlet is then adjusted using PID control. Finally, the voltage of the booster pump is controlled using PID control to achieve dual regulation of effluent flow rate and ion concentration. The optimal target is achieved through sequential control using different PID controllers. Furthermore, the magnetic field coil adjusts quickly, while the adjustable valve at the wastewater outlet adjusts slowly. The three PID controllers work in rotation, allowing for rapid adjustment of ion concentration (e.g., adjustment using only the magnetic field coil) and a wide adjustment range (e.g., adjustment using a combination of the magnetic field coil and the adjustable valve), while simultaneously achieving stable effluent flow rate and minimal wastewater.

[0181] Example 3

[0182] Figure 4 This is a schematic diagram of an electronic device provided in Embodiment 4 of the present invention. The electronic device includes a memory, a processor, and a computer program stored in the memory and used to run on the processor. When the processor executes the program, it implements the desalination rate adjustment method of the water purification device in Embodiment 1. Figure 4 The electronic device 30 shown is merely an example and should not impose any limitation on the functionality and scope of use of the embodiments of the present invention.

[0183] like Figure 4 As shown, the electronic device 30 can be manifested as a general-purpose computing device, such as a server device. The components of the electronic device 30 may include, but are not limited to: at least one processor 31, at least one memory 32, and a bus 33 connecting different system components (including memory 32 and processor 31).

[0184] Bus 33 includes a data bus, an address bus, and a control bus.

[0185] The memory 32 may include volatile memory, such as random access memory (RAM) 321 and / or cache memory 322, and may further include read-only memory (ROM) 323.

[0186] The memory 32 may also include a program / utility 325 having a set (at least one) of program modules 324, including but not limited to: an operating system, one or more application programs, other program modules, and program data, each or some combination of these examples may include an implementation of a network environment.

[0187] The processor 31 executes various functional applications and data processing by running computer programs stored in the memory 32, such as the desalination rate adjustment method of the water purification device in Embodiment 1 of the present invention.

[0188] Electronic device 30 can also communicate with one or more external devices 34 (e.g., keyboard, pointing device, etc.). This communication can be performed via input / output (I / O) interface 35. Furthermore, the model-generating device 30 can also communicate with one or more networks (e.g., local area network (LAN), wide area network (WAN), and / or public networks, such as the Internet) via network adapter 36. Figure 4 As shown, network adapter 36 communicates with other modules of the model-generated device 30 via bus 33. It should be understood that, although not shown in the figure, other hardware and / or software modules can be used in conjunction with the model-generated device 30, including but not limited to: microcode, device drivers, redundant processors, external disk drive arrays, RAID (disk array) systems, tape drives, and data backup storage systems.

[0189] It should be noted that although several units / modules or sub-units / modules of the electronic device have been mentioned in the detailed description above, this division is merely exemplary and not mandatory. In fact, according to embodiments of the present invention, the features and functions of two or more units / modules described above can be embodied in one unit / module. Conversely, the features and functions of one unit / module described above can be further divided and embodied by multiple units / modules.

[0190] Example 4

[0191] This embodiment provides a computer-readable storage medium storing a computer program thereon. When the program is executed by a processor, it implements the desalination rate adjustment method of the water purification equipment provided in Embodiment 1.

[0192] The readable storage medium may be more specifically adopted, including but not limited to: portable disk, hard disk, random access memory, read-only memory, erasable programmable read-only memory, optical storage device, magnetic storage device, or any suitable combination thereof.

[0193] In a possible implementation, the present invention can also be implemented as a program product comprising program code, which, when the program product is run on a terminal device, causes the terminal device to execute the desalination rate adjustment method of the water purification equipment described in Embodiment 1.

[0194] The program code for executing the present invention can be written in any combination of one or more programming languages. The program code can be executed entirely on the user device, partially on the user device, as a standalone software package, partially on the user device and partially on a remote device, or entirely on a remote device.

[0195] While specific embodiments of the present invention have been described above, those skilled in the art should understand that these are merely illustrative examples, and the scope of protection of the present invention is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principles and essence of the present invention, but all such changes and modifications fall within the scope of protection of the present invention.

Claims

1. A method for adjusting the desalination rate of a water purification device, the water purification device comprising a nanofiltration unit, a sensor TDS1, and a sensor TDS2, characterized in that, The nanofiltration device is externally equipped with a magnetic field coil, and the desalination rate adjustment method includes: Obtain the current desalination rate and target desalination rate of the water purification equipment; Determine whether the current desalination rate has reached the target desalination rate. If not, adjust the voltage and / or magnetic field direction of the magnetic field coil so that the current desalination rate reaches the target desalination rate. The step of adjusting the voltage and / or magnetic field direction of the magnetic field coil to achieve the target desalination rate includes: Obtain the previous desalination rate; The voltage adjustment value of the magnetic field coil is calculated based on the current desalination rate, the target desalination rate, and the previous desalination rate; Determine whether the current desalination rate is greater than the target desalination rate. If so, adjust the magnetic field coil in the forward direction and / or adjust the voltage of the magnetic field coil according to the voltage adjustment value of the magnetic field coil so that the current desalination rate reaches the target desalination rate. If not, adjust the magnetic field coil in the reverse direction and / or adjust the voltage of the magnetic field coil according to the voltage adjustment value of the magnetic field coil so that the current desalination rate reaches the target desalination rate. The expression for the voltage regulation value is: ΔU1(t) = Kp1*e(t) + Ki1* Σe(t) + Kd1*(e(t) - e(t-1)), where ΔU1(t) represents the voltage adjustment value of the magnetic field coil; e(t) represents the difference between the current desalination rate and the target desalination rate, i.e., e(t) = δ0 – δ1, where δ0 represents the target desalination rate and δ1 represents the current desalination rate; e(t-1) represents the difference between the previous desalination rate and the target desalination rate, i.e., e(t-1) = δ0 – δ2, where δ2 represents the previous desalination rate; Kp1, Ki1, and Kd1 are all adjustable parameters. It should be noted that typically Kp1 = 10 * Ki1; Kp1 = 5 * Kd1. The step of obtaining the current desalination rate of the water purification equipment includes: The actual influent ion concentration and actual effluent ion concentration of the nanofiltration device were measured. The current desalination rate δ1 is calculated based on the actual influent ion concentration and the actual effluent ion concentration, where δ1 = (TDS2 - TDS1) / TDS1, and TDS1 represents the actual influent ion concentration; TDS2 represents the actual effluent ion concentration. The step of obtaining the target desalination rate of the water purification equipment includes: The actual influent ion concentration of the nanofiltration device was detected. Obtain the target ion concentration value of the effluent from the nanofiltration device; The target desalination rate δ0 is calculated based on the actual influent ion concentration and the target effluent ion concentration, where δ0 = (T0 - TDS1) / TDS1, and T0 represents the target effluent ion concentration.

2. The method for adjusting the desalination rate of the water purification equipment as described in claim 1, characterized in that, If the voltage of the magnetic field coil is adjusted to the upper limit voltage of the magnetic field coil, and the current desalination rate has not yet reached the target desalination rate, the desalination rate adjustment method further includes: Adjust the opening of the adjustable valve at the wastewater outlet of the nanofiltration device so that the current desalination rate reaches the target desalination rate.

3. The method for adjusting the desalination rate of the water purification equipment as described in claim 1, characterized in that, If the voltage of the magnetic field coil is adjusted to the upper limit voltage of the magnetic field coil, and the opening of the adjustable valve at the wastewater outlet of the nanofiltration device is adjusted to the maximum opening, and the current desalination rate has not yet reached the target desalination rate, the desalination rate adjustment method further includes: Adjust the voltage of the booster pump in the water purification equipment so that the current desalination rate reaches the target desalination rate.

4. The method for adjusting the desalination rate of the water purification equipment as described in claim 2, characterized in that, The step of adjusting the opening of the adjustable valve at the wastewater outlet of the nanofiltration device to achieve the target desalination rate includes: Obtain the previous desalination rate and the previous two desalination rates; The opening adjustment value of the adjustable valve at the wastewater outlet of the nanofiltration device is calculated based on the previous desalination rate, the previous two desalination rates, and the target desalination rate. Adjust the opening of the adjustable valve at the wastewater outlet of the nanofiltration device according to the opening adjustment value, so that the current desalination rate reaches the target desalination rate.

5. The method for adjusting the desalination rate of the water purification equipment as described in claim 3, characterized in that, The step of adjusting the voltage of the booster pump in the water purification equipment to achieve the target desalination rate includes: Obtain the current outflow rate, target outflow rate, previous outflow rate, and the outflow rates of the two previous outflow rates; The voltage adjustment value of the booster pump is calculated based on the current water flow rate, the target water flow rate, the previous water flow rate, and the previous two water flow rates. Adjust the voltage of the booster pump according to the voltage regulation value of the booster pump so that the current desalination rate reaches the target desalination rate.

6. A desalination rate adjustment system for a water purification device used to perform the desalination rate adjustment method of any one of claims 1-5, wherein the water purification device includes a nanofiltration unit, characterized in that, The nanofiltration device is externally equipped with a magnetic field coil, and the desalination rate adjustment system includes an acquisition module, a judgment module, and a first adjustment module. The acquisition module is used to acquire the current desalination rate and target desalination rate of the water purification equipment; The judgment module is used to determine whether the current desalination rate has reached the target desalination rate. If not, the first adjustment module is invoked. The first adjustment module is used to adjust the voltage and / or magnetic field direction of the magnetic field coil so that the current desalination rate reaches the target desalination rate.

7. An electronic device comprising a memory, a processor, and a computer program stored in the memory and for running on the processor, characterized in that, When the processor executes the computer program, it implements the desalination rate adjustment method of the water purification equipment as described in any one of claims 1-5.

8. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by the processor, it implements the desalination rate adjustment method of the water purification equipment as described in any one of claims 1-5.

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