Control method, system, medium and equipment for accurately prompting cleaning of filter

Abstract

The invention relates to the technical field of closed waterway filtering control, and discloses a control method, system, medium and equipment for accurately prompting filter cleaning, and the method comprises the following steps: arranging a pressure gauge and a flow sensor on a closed waterway, and analyzing the relation among the output power of a speed regulating pump, the water flow and the filter blocking degree through the law of conservation of energy; before the closed water path is actually used, a relational expression between the output power of the speed regulating pump and the water flow and a relational expression between the blockage degree of the filter and the output power of the speed regulating pump are constructed according to the relation among the three; in the actual use process of the closed waterway, the real-time water flow is obtained through the flow sensor, the real-time blocking degree of the filter is calculated in combination with the relational expression, and cleaning control prompt is conducted on the filter according to the real-time blocking degree of the filter. According to the invention, real-time monitoring and accurate judgment of the blockage degree of the filter under the closed waterway can be realized, so that accurate cleaning control prompt is realized.

Description

Technical Field

[0001] This invention relates to the field of closed-loop water filtration control technology, and in particular to a control method, system, medium, and device for accurately prompting filter cleaning. Background Technology

[0002] In closed-loop water circulation systems for residential, commercial, or industrial use, pumps and filters are typically installed along the pipes. Common pumps include constant-speed pumps and variable-speed pumps, used to ensure the water at the pump outlet reaches the appropriate pressure and head. The longer the waterway, the more components are involved, and the greater the vertical drop, resulting in energy loss. This energy loss is compensated for by the pump's work; the greater the loss, the greater the pump's power consumption. Filters are used to remove impurities or metal oxides from the water. In open-loop systems, filters primarily remove impurities and purify the water. In closed-loop systems, filters mainly adsorb impurities to prevent blockages.

[0003] like Figure 1 The diagram shows a closed-loop water system designed for an air-source heat pump. In this system, water, as the heat exchange medium, is heated by the outdoor unit and then exchanges heat with the user's water source in the water tank. After heat exchange, the water is recharged by a speed-regulating pump and returned to the outdoor side, completing the internal water circulation. To prevent water blockage from affecting heat exchange capacity, a magnetic filter is installed before the water pump in the return water pipe. The built-in magnet can instantly attract metal oxides, and the filter screen can also effectively filter impurities.

[0004] However, the enclosed structure and non-external water system of the indoor unit make it impossible to visually observe and judge the degree of filter blockage, thus making it impossible to determine whether the filter needs cleaning. Existing methods for indicating filter cleaning needs are mostly designed for open water system structures and cannot be applied to closed systems. Furthermore, existing methods for indicating filter cleaning needs typically rely on flow rate to determine the filter's operating status, displaying only partial parameters and indicating whether cleaning is needed, without directly reflecting the degree of blockage. This negatively impacts user experience and prevents real-time monitoring of the filter's operating status. Summary of the Invention

[0005] Therefore, the technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a control method, system, medium and device for accurately prompting filter cleaning, which can realize real-time monitoring and accurate judgment of the degree of filter blockage in a closed water circuit, thereby achieving accurate cleaning control prompts.

[0006] To address the aforementioned technical problems, this invention provides a control method for accurately indicating filter cleaning, comprising:

[0007] Pressure gauges and flow sensors are installed in a closed water circuit, which includes a speed-regulating pump and a filter. The relationship between the output power of the speed-regulating pump, the water flow rate, and the degree of filter clogging is analyzed using the law of conservation of energy.

[0008] Before actually using the closed water circuit, the output power of multiple variable speed pumps is preset in the forward direction, and the water flow rate corresponding to each output power is monitored. The relationship between the output power of the variable speed pump and the water flow rate, and the relationship between the filter clogging degree and the output power of the variable speed pump are constructed through the relationship between the output power of the variable speed pump, the water flow rate and the output power of the filter clogging degree.

[0009] In the actual use of a closed water circuit, the real-time water flow rate is obtained through a flow sensor. The real-time output power of the speed-regulating pump is calculated based on the relationship between the output power of the speed-regulating pump and the water flow rate. The real-time degree of filter clogging is calculated based on the relationship between the filter clogging degree and the output power of the speed-regulating pump. The filter is then cleaned and prompted according to the real-time degree of filter clogging.

[0010] Furthermore, the relationship between the output power of the speed-regulating pump and the water flow rate, and the relationship between the filter clogging degree and the output power of the speed-regulating pump, are obtained by fitting polynomial functions, exponential functions, and power functions.

[0011] Furthermore, the analysis of the relationship between the output power of the speed-regulating pump, water flow rate, and filter clogging degree using the law of conservation of energy is specifically as follows:

[0012] The position of the water path before entering the filter is recorded as point 1, the position of the water path between the filter and the speed-regulating pump is recorded as point 2, and the position of the water path after exiting the speed-regulating pump is recorded as point 3. The energy conservation relationship between points 1 and 3 is obtained by combining the energy conservation relationship between two adjacent points.

[0013] Based on the energy conservation equations from point 1 to point 3, a relationship between hydraulic losses and the output power of the variable speed pump is constructed. Combining the characteristics of hydraulic losses, the correlation between the output power of the variable speed pump, water flow rate, and filter clogging degree is obtained.

[0014] Furthermore, the energy conservation relationship between two adjacent points is combined to obtain the energy conservation relationship between point 1 and point 3, specifically as follows:

[0015] Using Bernoulli's equation, the energy conservation relationship between point 1 and point 2 can be established as follows:

[0016]

[0017] Where P1 represents the pressure at point 1, ρ represents the fluid density, g represents the acceleration due to gravity, Cf1 represents the flow velocity at point 1, Z1 represents the water level at point 1, P2 represents the pressure at point 2, Cf2 represents the flow velocity at point 2, Z2 represents the water level at point 2, and H... 损 Indicates water conservancy losses;

[0018] Using Bernoulli's equation, the energy conservation relationship between point 2 and point 3 can be established as follows:

[0019]

[0020] Where P3 represents the pressure at point 3, Cf3 represents the flow velocity at point 3, Z3 represents the water level at point 3, and W... pump This indicates the output power of the speed-regulating pump;

[0021] Combining formulas (1) and (2), the energy conservation relationship between point 1 and point 3 is obtained as follows:

[0022]

[0023] Furthermore, the relationship between hydraulic losses and the output power of the speed-regulating pump, constructed based on the energy conservation equations from point 1 to point 3, is as follows:

[0024] After the closed waterway stabilizes, the flow velocity at point 1 and point 3 is the same and the water level remains unchanged. According to formula (3), the relationship between hydraulic losses and the output power of the speed regulating pump is as follows:

[0025]

[0026] According to formula (4), the relationship between the final hydraulic loss and the output power of the speed regulating pump is obtained by transformation as follows:

[0027]

[0028] The pressure difference caused by hydraulic losses can be attributed to friction loss and local loss in the waterway. Under the condition that the waterway structure remains unchanged, friction loss exists but remains unchanged, and the initial local loss remains unchanged. Because the initial local loss remains unchanged, the reason for the change of P1 and P3 is that there is friction loss in the pipeline. However, since the pipeline is compact and the pipeline from point 1 to point 3 is short, the friction loss can be ignored. Therefore, formula (5) can be further expressed as:

[0029] H 损 =K×W pump (6);

[0030] Where K is the conversion factor.

[0031] Furthermore, the correlation between the output power of the speed-regulating pump, water flow rate, and filter clogging degree, obtained by combining the characteristics of hydraulic losses, is as follows:

[0032] The pressure difference caused by hydraulic losses can be attributed to friction loss and local loss along the waterway. When the waterway structure remains unchanged, friction loss exists but remains constant, and the initial local loss remains unchanged. After the filter becomes clogged, the local loss will gradually increase. The actual increase in the output power of the speed-regulating pump is approximately equal to the increase in hydraulic losses. Since the increase in hydraulic losses is mainly borne by the increase in local losses caused by filter clogging, the output power of the speed-regulating pump can linearly represent the degree of filter clogging.

[0033] If the output power of the variable speed pump is fixed, then after the filter becomes clogged, the local losses increase and the water flow decreases. Therefore, the relationship between the output power of the variable speed pump, the water flow, and the degree of filter clogging is as follows: as the degree of filter clogging increases, the output power of the variable speed pump increases linearly, the hydraulic losses increase linearly, and the water flow decreases non-linearly.

[0034] Furthermore, the step of providing cleaning control prompts for the filter based on its real-time clogging level specifically includes:

[0035] Let the acquired real-time water flow be Flow_t. Calculate whether the condition Abs[(Flow_t-Flow(i-1)) / Flow_t]<a×Abs[(Flow(i-1)-Flowi) / Flow(i-1)]% is met; where Abs represents absolute value operation, Flow(i-1) represents the water flow corresponding to the output power of the (i-1)th preset speed-regulating pump, Flowi represents the water flow corresponding to the output power of the ith preset speed-regulating pump, and a represents the control coefficient; if the condition is met, continue using the closed water circuit; until the condition is not met and the real-time blockage degree is greater than the preset threshold, then prompt to clean the filter.

[0036] Furthermore, it also includes:

[0037] After each filter cleaning, a water flow confidence interval is established based on the current monitored water flow and the previous monitored water flow. Based on the water flow confidence interval, the relationship between the output power of the speed-regulating pump and the water flow, and the relationship between the filter clogging degree and the output power of the speed-regulating pump are reconstructed.

[0038] Furthermore, the step of establishing a water flow confidence interval based on the current monitored water flow and the previous monitored water flow, and reconstructing the relationship between the output power of the speed-regulating pump and the water flow, and the relationship between the filter clogging degree and the output power of the speed-regulating pump based on the water flow confidence interval, specifically involves:

[0039] The current monitored water flow rate is denoted as Flowi, the corresponding output power of the speed-regulating pump is denoted as Wi, and the corresponding degree of filter clogging is denoted as Xi; the previous monitored water flow rate is denoted as Flow(i-1), the corresponding output power of the speed-regulating pump is denoted as W(i-1), and the corresponding degree of filter clogging is denoted as X(i-1).

[0040] When the average water flow rate monitored in a certain instance belongs to the interval (Flowi, Flow(i-1)) and there have been m calculations of the average water flow rate within this interval, a water flow rate set F is established, which includes m+2 monitored water flow rate values. F = {Flow(i-1), Flow_t1, Flow_t2, ..., Flow_ti, ..., Flow_tm, Flowi}, where Flow_ti is the i-th monitored water flow rate value.

[0041] Divide the output power range (W(i-1), Wi) of the speed-regulating pump into (m+2) equal parts, and construct the output power set W of the speed-regulating pumps with (m+2) output power, W={W_ti1,W_ti2,…,W_ti,…,W_t(m+2)}, where W_ti is the output power of the i-th speed-regulating pump obtained by equal division, W_ti=W1-[(W2-W1) / (m+2)]*i, i=1,2,3……m+2;

[0042] Divide the congestion percentage interval (X(i-1), Xi) into (m+2) equal parts to form a congestion percentage set X containing (m+2) congestion percentages, X={X_ti1,X_ti2,…,X_ti,…,X_t(m+2)}, where X_ti is the i-th congestion percentage obtained by equal division, X_ti=X1-[(X2-X1) / (m+2)]*i, i=1,2,3……m+2;

[0043] By combining the data in sets F, W, and X, we can reconstruct the relationship between the output power of the speed-regulating pump and the water flow rate, as well as the relationship between the degree of filter clogging and the output power of the speed-regulating pump.

[0044] The present invention also provides a control system for accurately indicating filter cleaning, comprising:

[0045] Pressure gauges and flow sensors are installed in a closed water circuit, which includes a speed-regulating pump and a filter.

[0046] The module for analyzing the relationship between the output power, water flow rate, and filter clogging degree of the variable speed pump is used to analyze the relationship between the output power, water flow rate, and filter clogging degree of the variable speed pump using the law of conservation of energy.

[0047] The relational construction module is used to preset the output power of multiple variable speed pumps before actual use of the closed water circuit, monitor the water flow rate corresponding to each output power, and construct the relationship between the output power of the variable speed pump and the water flow rate, and the relationship between the filter clogging degree and the output power of the variable speed pump through the relationship between the output power of the variable speed pump, the water flow rate and the output power of the filter clogging degree.

[0048] The filter cleaning control module is used to obtain real-time water flow through a flow sensor during actual use in a closed water circuit, calculate the real-time output power of the speed-regulating pump based on the relationship between the output power of the speed-regulating pump and the water flow, calculate the real-time degree of filter clogging based on the relationship between the filter clogging degree and the output power of the speed-regulating pump, and provide cleaning control prompts for the filter based on the real-time degree of filter clogging.

[0049] The relational reconstruction module is used to establish a water flow confidence interval based on the current monitored water flow and the previous monitored water flow after each filter cleaning, and to reconstruct the relationship between the output power of the speed-regulating pump and the water flow, and the relationship between the filter clogging degree and the output power of the speed-regulating pump based on the water flow confidence interval.

[0050] A display shows the real-time clogging level of the filter.

[0051] The present invention also provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the control method for accurately prompting filter cleaning.

[0052] The present invention also provides a control device for accurately prompting filter cleaning, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the control method for accurately prompting filter cleaning.

[0053] Compared with the prior art, the above-described technical solution of the present invention has the following advantages:

[0054] This invention analyzes the relationship between the output power of a speed-regulating pump, water flow rate, and the degree of filter clogging. Based on this analysis, it constructs formulas relating the output power of the speed-regulating pump to the water flow rate and the degree of filter clogging to the output power of the speed-regulating pump. By combining real-time water flow rate, the degree of filter clogging is calculated. Thus, the filter is cleaned and controlled based on the real-time degree of clogging, enabling real-time monitoring and accurate judgment of the degree of filter clogging in a closed water circuit, thereby achieving accurate cleaning control prompts. Attached Figure Description

[0055] To make the content of this invention easier to understand, the invention will be further described in detail below with reference to specific embodiments and accompanying drawings, wherein:

[0056] Figure 1 This is a schematic diagram of the indoor unit's water system.

[0057] Figure 2 This is a flowchart of a method in a preferred embodiment of the present invention.

[0058] Figure 3 The diagram shows the specific steps of the method in a preferred embodiment of the present invention. Detailed Implementation

[0059] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, so that those skilled in the art can better understand and implement the present invention. However, the embodiments described are not intended to limit the present invention.

[0060] Example 1

[0061] Reference Figure 2 and Figure 3 As shown, this invention discloses a control method for accurately prompting filter cleaning, comprising the following steps:

[0062] S1: Install a pressure gauge and a flow sensor in a closed water circuit. The closed water circuit includes a speed-regulating pump and a filter. Analyze the relationship between the output power of the speed-regulating pump, the water flow rate, and the degree of filter clogging using the law of conservation of energy.

[0063] S1-1: A pressure gauge and a flow sensor are installed in the closed water circuit. The closed water circuit includes a speed-regulating pump and a filter. In this embodiment, the filter can be a magnetic filter or other filters.

[0064] S1-2: The relationship between the output power of the speed-regulating pump, water flow rate, and filter clogging degree is analyzed using the law of conservation of energy. Specifically:

[0065] S1-2-1: Ignoring changes in gravitational potential energy, the water flow rate is the same after stabilization. The position of the water path before entering the filter is recorded as point 1, the position of the water path between the filter and the speed-regulating pump is recorded as point 2, and the position of the water path after exiting the speed-regulating pump is recorded as point 3.

[0066] S1-2-2: Combining the energy conservation relationship between two adjacent points, we obtain the energy conservation relationship between point 1 and point 3.

[0067] Using Bernoulli's equation, the energy conservation relationship between point 1 and point 2 can be established as follows:

[0068]

[0069] Where P1 represents the pressure at point 1, ρ represents the fluid density, g represents the acceleration due to gravity, Cf1 represents the flow velocity at point 1, Z1 represents the water level at point 1, P2 represents the pressure at point 2, Cf2 represents the flow velocity at point 2, Z2 represents the water level at point 2, and H... 损 Indicates water conservancy losses;

[0070] Using Bernoulli's equation, the energy conservation relationship between point 2 and point 3 can be established as follows:

[0071]

[0072] Where P3 represents the pressure at point 3, Cf3 represents the flow velocity at point 3, Z3 represents the water level at point 3, and W... pump This indicates the output power of the speed-regulating pump;

[0073] Combining formulas (1) and (2), the energy conservation relationship between point 1 and point 3 is obtained as follows:

[0074]

[0075] S1-2-3: Construct a relationship between hydraulic losses and the output power of the speed-regulating pump based on the energy conservation relationship from point 1 to point 3.

[0076] After the closed waterway stabilizes, the flow velocities at points 1 and 3 are the same, and the water level remains unchanged, i.e., Cf1 = Cf3 and Z1 = Z3. According to formula (3), we can obtain The relationship between hydraulic losses and the output power of the speed-regulating pump after transformation is as follows:

[0077]

[0078] According to formula (4), the relationship between the final hydraulic loss and the output power of the speed regulating pump is obtained by transformation as follows:

[0079]

[0080] The pressure difference caused by hydraulic losses can be attributed to friction loss and local loss in the waterway. Under the condition that the waterway structure remains unchanged, friction loss exists but remains unchanged, and the initial local loss remains unchanged. The theoretical linear relationship in the form of formula (5) is such that, since the initial local loss remains unchanged, the reason for the change of P1 and P3 is that there is friction loss in the pipeline. However, since the pipeline is compact and the pipeline from point 1 to point 3 is short, the friction loss can be ignored. Therefore, formula (5) can be further expressed as:

[0081] H 损 =K×W pump (6);

[0082] Where K is the conversion factor.

[0083] S1-2-4: Based on the characteristics of hydraulic losses, the correlation between the output power of the speed regulating pump, water flow rate, and filter clogging degree is obtained.

[0084] When the filter is not clogged, the pressure difference caused by hydraulic losses is mainly attributed to friction loss and local losses along the waterway. Friction loss refers to the water loss caused by the resistance of the pipe wall to the water. Local losses refer to the losses caused by changes in the pipe structure, including sudden changes in pipe diameter, bends, and irregular shapes.

[0085] The formulas for calculating friction loss and local loss are as follows:

[0086]

[0087] Among them, h 沿 Let λ represent the friction loss, Cf represent the flow velocity at the current waterway location, l represent the pipe length, d represent the pipe diameter, and h represent the flow rate. 局 Let ξ represent the local loss, and let ξ represent the local loss coefficient.

[0088] With the waterway structure unchanged, the friction loss exists but remains unchanged, and the initial local loss remains unchanged; after the filter becomes clogged, the local loss will gradually increase, and the values ​​of formulas (4) and (5) remain unchanged; that is to say, the actual increase in the output power of the speed-regulating pump is approximately equal to the increase in the hydraulic loss; combined with the fact that the increase in hydraulic loss is mainly borne by the increase in local loss caused by the filter clogging, the output power of the speed-regulating pump can linearly represent the degree of filter clogging; in this embodiment, the degree of clogging is represented by a percentage X%, so the output power of the pump linearly represents the degree of filter clogging as X% = H 损 =θ×W pump θ is an empirical constant.

[0089] After the filter is clogged, if the speed-regulating pump keeps the water flow in the pipeline constant, the output power of the speed-regulating pump will increase. The change in the output power of the speed-regulating pump is linearly related to the change in hydraulic losses and the degree of filter clogging. If the output power of the speed-regulating pump is fixed, the local losses will increase and the water flow will decrease after the filter is clogged. However, by combining formulas (7) and (8), it can be seen that the change in water flow is not linearly related to the change in hydraulic losses and the degree of filter clogging. Thus, the relationship between the output power of the speed-regulating pump, the water flow, and the degree of filter clogging is as follows: as the degree of filter clogging increases, the output power of the speed-regulating pump increases linearly, the hydraulic losses increase linearly, and the water flow decreases nonlinearly.

[0090] S2: Before actual use of the closed water system, a trial run is conducted. The output power of multiple variable-speed pumps is preset, and the water flow rate corresponding to each output power is monitored. Relationships between the output power of the variable-speed pumps and the water flow rate, and between the degree of filter clogging and the output power of the variable-speed pumps, are constructed based on the relationship between the output power of the variable-speed pumps, the water flow rate, and the degree of filter clogging. These relationships are obtained by fitting polynomial functions, exponential functions, and power functions. In this embodiment, the fitting method can also be other functional forms, the specific form of which is determined by the characteristics of the experimental data.

[0091] S3: In the actual use of the closed water circuit, the real-time water flow rate is obtained through the flow sensor. The real-time output power of the speed-regulating pump is calculated based on the relationship between the output power of the speed-regulating pump and the water flow rate. The real-time degree of filter blockage is calculated based on the relationship between the filter blockage degree and the output power of the speed-regulating pump. The filter is then cleaned and prompted according to the real-time degree of filter blockage.

[0092] S3-1: In the actual use of a closed water circuit, the real-time water flow rate is obtained through a flow sensor. The real-time output power of the speed-regulating pump is calculated based on the relationship between the output power of the speed-regulating pump and the water flow rate. The real-time degree of filter blockage is calculated by combining the relationship between the filter blockage degree and the output power of the speed-regulating pump.

[0093] S3-2: Let the acquired real-time water flow be Flow_t. Calculate whether the condition Abs[(Flow_t-Flow(i-1)) / Flow_t]<a×Abs[(Flow(i-1)-Flowi) / Flow(i-1)]% is met, where Abs represents the absolute value operation, Flow(i-1) represents the water flow corresponding to the output power of the (i-1)th preset speed-regulating pump, Flowi represents the water flow corresponding to the output power of the ith preset speed-regulating pump, and a represents the control coefficient. If the condition is met, it is considered that the decrease in water flow is small and the filter is less clogged, so the closed water circuit continues to be used. Until the condition is not met and the real-time clogging degree is greater than the preset threshold, the filter is prompted to be cleaned.

[0094] S4: After each filter cleaning, establish a water flow confidence interval based on the current monitored water flow and the previous monitored water flow. Based on the water flow confidence interval, reconstruct the relationship between the output power of the speed-regulating pump and the water flow, and the relationship between the filter clogging degree and the output power of the speed-regulating pump. This can further improve the fitting degree of the relationship, thereby obtaining a more accurate degree of clogging.

[0095] S4-1: After each filter cleaning, record the current monitored water flow rate as Flowi, the corresponding speed-regulating pump output power as Wi, and the corresponding filter clogging degree as Xi; record the previous monitored water flow rate as Flow(i-1), the corresponding speed-regulating pump output power as W(i-1), and the corresponding filter clogging degree as X(i-1).

[0096] S4-2: When the average water flow rate monitored in a certain time belongs to the interval (Flowi, Flow(i-1)) and there have been m calculations of the average water flow rate in this interval, then establish a water flow rate set F including m+2 monitored water flow rate values, F={Flow(i-1),Flow_t1,Flow_t2,…,Flow_ti,…,Flow_tm,Flowi}, where Flow_ti is the i-th monitored water flow rate value;

[0097] Divide the output power range (W(i-1), Wi) of the speed-regulating pump into (m+2) equal parts, and construct the output power set W of the speed-regulating pump including (m+2) output power, W={W_ti1,W_ti2,…,W_ti,…,W_t(m+2)}, where W_ti is the output power of the i-th speed-regulating pump obtained by equal division, W_ti=W1-[(W2-W1) / (m+2)]*i, i=1,2,3……m+2; where W_ti1 is W(i-1) and W_t(m+2) is Wi.

[0098] Divide the congestion percentage interval (X(i-1), Xi) into (m+2) equal parts to form a congestion percentage set X containing (m+2) congestion percentages, X = {X_ti1, X_ti2, ..., X_ti, ..., X_t(m+2)}, where X_ti is the i-th congestion percentage obtained by equal division, X_ti = X1 - [(X2-X1) / (m+2)]*i, i = 1, 2, 3 ... m+2; where X_ti1 is X(i-1) and X_t(m+2) is Xi.

[0099] S4-3: Combine the data in sets F, W, and X to reconstruct the relationship between the output power of the speed-regulating pump and the water flow rate, and the relationship between the filter clogging degree and the output power of the speed-regulating pump, in order to further improve the fit of the relationship.

[0100] In this embodiment, the degree of filter clogging is represented by the clogging percentage. During trial operation, an empirical formula is established regarding the clogging percentage, the output power of the speed-regulating pump, and the water flow rate. Then, based on the water flow rate data monitored during actual operation, the empirical formula is substituted into the formula to calculate the clogging percentage. Data analysis of the water flow rate data acquired during the monitoring period further refines the empirical formula and improves the calculation accuracy. The specific process is as follows:

[0101] During the trial operation, the speed-regulating pump was operated at 100% power for 1 minute, and the average power W1 of the speed-regulating pump within 1 minute was recorded. The corresponding average water flow rate Flow1 monitored by the flow sensor was also recorded. The blockage percentage under this condition was set to X1 = 0%. Subsequently, the speed-regulating pump was operated at 80% power for 1 minute, and the average power W2 of the speed-regulating pump within 1 minute was recorded. The corresponding average water flow rate Flow2 monitored by the flow sensor was also recorded. The blockage percentage under this condition was set to X1 = 20%. This process was repeated until the speed-regulating pump was operated at 20% power for 1 minute. The average power W5 of the speed-regulating pump within 1 minute was recorded, and the corresponding water flow rate Flow5 was monitored. The blockage percentage under this condition was set to X5 = 80%. The data obtained is shown in Table 1.

[0102] Table 1 Preset Parameters During Trial Operation

[0103] defined percentage of clogging defined output power of the speed-regulated pump monitored water flow X1＝0％ W1＝100％ Flow1 X2＝20％ W2＝80％ Flow2 X3＝40％ W3＝60％ Flow3 X4＝60％ W4＝40％ Flow4 X5＝80％ W5＝20％ Flow5

[0104] Based on the data in the second and third columns of Table 1, the relationship between the output power of the speed-regulating pump and the water flow rate is obtained by polynomial fitting as follows:

[0105] W(Flow) = A Flow^n + B Flow^(n-1) + C Flow^(n-2) + D, where W(Flow) represents the relationship between the output power of the speed-regulating pump and the water flow rate, Flow represents the water flow rate, A, B, C, and D represent the fitting coefficients, and n represents the fitting index.

[0106] Based on the data in the first and second columns of Table 1, the relationship between the filter blockage percentage and the output power of the speed-regulating pump is obtained using polynomial fitting:

[0107] X(W) = CW + Z,

[0108] Where X(W) represents the relationship between the filter clogging percentage and the output power of the speed-regulating pump, W represents the output power of the speed-regulating pump, and C and Z represent the fitting coefficients.

[0109] In the actual use of the closed water circuit, the monitoring time is set according to the duration, with 100 hours of operation as the starting point. When the machine has accumulated 100 hours of operation, the fixed speed pump outputs at 100% capacity for 1 minute, and the average water flow rate is recorded as Flow_t. Substituting Flow_t into the function W(Flow) yields the calculated value W_t of the output power of the speed pump. Then, substituting W_t into the function X(W) yields the calculated value X_t of the filter blockage percentage. If Abs[(Flow_t-Flow1) / Flow_t]<0.5×Abs[(Flow1-Flow2) / Flow1]%, it is considered that the reduction in water flow is small and the filter blockage is small. Then, the machine runs for 20 hours and performs the next calculation. Abs represents the absolute value operation. The calculation continues until Abs[(Flow_t-Flow1) / Flow_t]>0.5×Abs[(Flow1-Flow2) / Flow1]%, at which point the result X_t is recorded and displayed on the online controller. When X_t>60%, a cleaning prompt is given.

[0110] Accuracy Learning: Blockage is a lengthy process, and the actual water flow monitored at each calculation time also decreases slowly. Each water flow data point is recorded, generating a data set of intervals to improve the accuracy of the fitted function. Specifically:

[0111] The water flow rate Flow1 (i.e., the previously monitored water flow rate) corresponding to the output power of the first positively preset speed-regulating pump and the water flow rate Flow2 corresponding to the output power of the second positively preset speed-regulating pump are used as the basis for the calculation.

[0112] Taking the current monitored water flow as an example, when the average water flow measured in a certain instance belongs to the interval...

[0113] When the average water flow rate has been calculated m times within the interval (Flow2, Flow1), a water flow rate set F is established, which includes m+2 monitored water flow rate values. F = {Flow1, Flow_t1, Flow_t2, ..., Flow_ti, ..., Flow_tm, Flow2}, where Flow_ti is the i-th monitored water flow rate value. The output power interval (W1, W2) of the speed-regulating pump is divided equally by (m+2) to form an output power set W of the speed-regulating pump with (m+2) output power values. W = {W_ti1, W_ti2, ..., W_ti, ..., W_t(m+2)}, where W_ti is the output power of the i-th speed-regulating pump obtained by equal division. W_ti = W1 - [(W2 - W1) / (m+2)]*i, i = 1, 2, 3, ..., m+2, W_ti1 = W1, W_t(m+2) = W2. Divide the congestion percentage interval (X1, X2) into (m+2) equal parts, forming a congestion percentage set X containing (m+2) congestion percentages, X = {X_ti1, X_ti2, ..., X_ti, ..., X_t(m+2)}, where X_ti is the i-th congestion percentage obtained by equal division, X_ti = X1 - [(X2-X1) / (m+2)]*i, i = 1, 2, 3, ..., m+2, X_ti1 = X1, X_t(m+2) = X2. The constructed sets F, W, and X are shown in Table 2.

[0114] Table 2 shows the constructed dataset (corresponding to the Flow1 to Flow2 interval).

[0115]

[0116] Based on the construction of three sets F, W, and X, the relationship between the output power of the speed-regulating pump and the water flow rate, W(Flow)=A Flow^n+B Flow^(n-1)+C Flow^(n-2)+D, can be further fitted to, for example, the form W(Flow)=A Flow^n+BFlow^(n-1)+C Flow^(n-2)+D Flow^(n-3)+E. The relationship between the filter clogging percentage and the output power of the speed-regulating pump, X(W)=CW+Z, can be further fitted to, for example, the form X(W)=CW^n+ZW^(n-1)+T. The accuracy of both can be further improved.

[0117] By constructing three sets, F, W, and X, the amount of data is increased. This increased data set is then used to fit the relationships between the output power of the speed-regulating pump and the water flow rate, as well as the relationship between the filter clogging degree and the output power of the speed-regulating pump. This increases the accuracy of the formula fitting and thus improves the accuracy of the clogging percentage calculation. Correspondingly, after each filter cleaning, a new formula is fitted, resulting in more accurate cycle determinations.

[0118] Example 2

[0119] The present invention also discloses a control system for accurately prompting filter cleaning, comprising:

[0120] Pressure gauges and flow sensors are installed in a closed water circuit, which includes a speed-regulating pump and a filter.

[0121] The module for analyzing the relationship between the output power, water flow rate, and filter clogging degree of the variable speed pump is used to analyze the relationship between the output power, water flow rate, and filter clogging degree of the variable speed pump using the law of conservation of energy.

[0122] The relational construction module is used to test the closed water circuit before actual use. It presets the output power of multiple variable speed pumps, monitors the water flow rate corresponding to each output power, and constructs the relational formulas between the output power of the variable speed pump and the water flow rate, and between the filter clogging degree and the output power of the variable speed pump through the relationship between the output power of the variable speed pump, the water flow rate and the filter clogging degree.

[0123] The filter cleaning control module is used to obtain real-time water flow through a flow sensor during actual use in a closed water circuit, calculate the real-time output power of the speed-regulating pump based on the relationship between the output power of the speed-regulating pump and the water flow, calculate the real-time degree of filter clogging based on the relationship between the filter clogging degree and the output power of the speed-regulating pump, and provide cleaning control prompts for the filter based on the real-time degree of filter clogging.

[0124] The relational reconstruction module is used to establish a water flow confidence interval based on the current monitored water flow and the previous monitored water flow after each filter cleaning, and to reconstruct the relationship between the output power of the speed-regulating pump and the water flow, and the relationship between the filter clogging degree and the output power of the speed-regulating pump based on the water flow confidence interval.

[0125] The display shows the real-time clogging level of the filter. It provides users with a clear view of the filter and machine's usage status, and also facilitates proactive maintenance.

[0126] Example 3

[0127] The present invention also discloses a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the control method for accurately prompting filter cleaning as described in Embodiment 1.

[0128] Example 4

[0129] The present invention also discloses an apparatus including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the control method for accurately prompting filter cleaning as described in Embodiment 1.

[0130] This invention analyzes the relationship between the output power of a speed-regulating pump, water flow rate, and the degree of filter clogging. Based on this analysis, it constructs formulas relating the output power of the speed-regulating pump to the water flow rate and the degree of filter clogging to the output power of the speed-regulating pump. By combining real-time water flow rate, the degree of filter clogging is calculated. Thus, the filter is cleaned and controlled based on the real-time degree of clogging, enabling real-time monitoring and accurate judgment of the degree of filter clogging in a closed water circuit, thereby achieving accurate cleaning control prompts.

[0131] Those skilled in the art will understand that embodiments of this application can be provided as methods, systems, or computer program products. Therefore, this application can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this application can take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0132] This application is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this application. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart... Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0133] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0134] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0135] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A control method for accurate prompting of filter cleaning, characterized in that The application relates to a method for analyzing the relationship among the output power of a speed-regulating pump, water flow and filter clogging degree. The method comprises the following steps: setting pressure gauges and flow sensors on a closed water channel, wherein the closed water channel comprises a speed-regulating pump and a filter; analyzing the relationship among the output power of the speed-regulating pump, water flow and filter clogging degree by the law of conservation of energy; presetting the output power of the speed-regulating pump before the closed water channel is actually used, monitoring the corresponding water flow under each output power, and constructing the relationship between the output power of the speed-regulating pump and water flow and the relationship between the filter clogging degree and the output power of the speed-regulating pump by the relationship among the output power of the speed-regulating pump, water flow and filter clogging degree; obtaining the real-time water flow by the flow sensor during the actual use of the closed water channel, calculating the real-time output power of the speed-regulating pump according to the relationship between the output power of the speed-regulating pump and water flow, calculating the real-time clogging degree of the filter in combination with the relationship between the filter clogging degree and the output power of the speed-regulating pump, and giving a cleaning control prompt for the filter according to the real-time clogging degree of the filter. The relationship between the output power of the speed-regulating pump and water flow and the relationship between the filter clogging degree and the output power of the speed-regulating pump are fitted by a polynomial function, an exponential function or a power function. The relationship among the output power of the speed-regulating pump, water flow and filter clogging degree is analyzed by the law of conservation of energy, and the method comprises the following steps: taking the position of the water channel before entering the filter as point 1, taking the position of the water channel between the filter and the speed-regulating pump as point 2, taking the position of the water channel after flowing out of the speed-regulating pump as point 3, obtaining the energy conservation relationship of points 1 to 3 in combination with the energy conservation relationship of adjacent two points, constructing the relationship between water loss and the output power of the speed-regulating pump according to the energy conservation relationship of points 1 to 3, and obtaining the correlation among the output power of the speed-regulating pump, water flow and filter clogging degree in combination with the characteristics of water loss.

2. The control method for accurate prompt filter cleaning according to claim 1, characterized in that: The energy conservation relationship of points 1 to 3 is obtained in combination with the energy conservation relationship of adjacent two points, and the method comprises the following steps: using Bernoulli equation to establish the energy conservation relationship of points 1 to 2 as formula (1): using Bernoulli equation to establish the energy conservation relationship of points 2 to 3 as formula (2): and obtaining the energy conservation relationship of points 1 to 3 in combination with formula (1) and formula (2) as formula (3):

3. The control method for accurate prompt filter cleaning according to claim 1, characterized in that: The relationship between water loss and the output power of the speed-regulating pump is constructed according to the energy conservation relationship of points 1 to 3, and the method comprises the following steps: the flow rates of point 1 and point 3 are consistent and the water level height is unchanged after the closed water channel is stabilized, the relationship between water loss and the output power of the speed-regulating pump is obtained according to formula (3) as formula (4): and the final relationship between water loss and the output power of the speed-regulating pump is obtained by transformation according to formula (4) as formula (5): The pressure difference change caused by water loss is attributed to the along-path loss and local loss of the water channel, and the along-path loss exists but is unchanged and the initial local loss is unchanged under the condition that the structure of the water channel is unchanged; because the initial local loss is unchanged, the reason for the change of P1 and P3 is that the along-path loss exists in the pipeline, but the along-path loss can be ignored because the pipeline is compact and the pipeline from point 1 to point 3 is short, so formula (5) is further expressed as formula (6): Wherein, K is a conversion coefficient.

4. The control method for accurate prompt filter cleaning according to claim 3, characterized in that: ​ ​ where P1 represents the pressure at point 1, p represents the fluid density, g represents the gravitational acceleration, Cf1 represents the flow rate at point 1, Z1 represents the water level height at point 1, P2 represents the pressure at point 2, Cf2 represents the flow rate at point 2, Z2 represents the water level height at point 2, H 损 represents the hydraulic loss; ​ where P3 represents the pressure at point 3, Cf3 represents the flow rate at point 3, Z3 represents the water level height at point 3, W pymp represents the output power of the speed regulating pump; ​ 5. The control method for accurate prompt filter cleaning according to claim 4, characterized in that: ​ ​ ​ ​ H 损 = K x W pump (6); ​ 6. The control method for accurate prompt filter cleaning according to claim 3, characterized in that: The characteristics of the water loss are combined to obtain the correlation among the output power of the speed-regulating pump, the water flow, and the filter clogging degree, specifically: The pressure difference change caused by the water loss is attributed to the along-the-way loss and the local loss of the waterway. In the case of unchanged waterway structure, the along-the-way loss exists but is unchanged, and the initial local loss is unchanged. After the filter is clogged, the local loss is gradually increased, and the actual output power increment of the speed-regulating pump is approximately equal to the water loss increment. The water loss increment is mainly borne by the local loss increment caused by the filter clogging, and thus the output power of the speed-regulating pump can linearly represent the filter clogging degree. If the output power of the speed-regulating pump is fixed, after the filter is clogged, the local loss is increased, and the water flow is decreased. Thus, the correlation among the output power of the speed-regulating pump, the water flow, and the filter clogging degree is obtained as follows: the filter clogging degree is increased, the output power of the speed-regulating pump is linearly increased, the water loss is linearly increased, and the water flow is nonlinearly decreased.

7. The control method for accurate prompt filter cleaning according to claim 1, characterized in that: The filter is controlled to be cleaned according to the real-time clogging degree of the filter, specifically: The obtained real-time water flow is recorded as Flow_t, and whether the condition Abs[(Flow_t-Flow(i-1)) / Flow_t]<a*Abs[(Flow(i-1)-Flowi) / Flow(i-1)]% is met is calculated; wherein, Abs represents an absolute value operation, Flow(i-1) represents the water flow corresponding to the output power of the (i-1)th speed-regulating pump in the forward direction, Flowi represents the water flow corresponding to the output power of the ith speed-regulating pump in the forward direction, and a represents a control coefficient. If the condition is met, the closed waterway is continuously used. Until the condition is not met and the real-time clogging degree is greater than a preset threshold, the filter is prompted to be cleaned.

8. The control method for accurate prompt filter cleaning according to claim 1, wherein, Further comprising: After the filter is cleaned each time, a water flow confidence interval is established according to the current monitored water flow and the previously monitored water flow, and a relationship between the output power of the speed-regulating pump and the water flow and a relationship between the filter clogging degree and the output power of the speed-regulating pump are re-established according to the water flow confidence interval.

9. The control method for accurate prompt filter cleaning according to claim 8, characterized in that: The water flow confidence interval is established according to the current monitored water flow and the previously monitored water flow, and the relationship between the output power of the speed-regulating pump and the water flow and the relationship between the filter clogging degree and the output power of the speed-regulating pump are re-established according to the water flow confidence interval, specifically: The current monitored water flow is recorded as Flowi, the corresponding output power of the speed-regulating pump is recorded as Wi, and the corresponding clogging degree of the filter is recorded as Xi. The previously monitored water flow is recorded as Flow(i-1), the corresponding output power of the speed-regulating pump is recorded as W(i-1), and the corresponding clogging degree of the filter is recorded as X(i-1). When the average water flow monitored at a certain time belongs to the interval segment (Flowi, Flow(i-1)) and there are m times of calculation of the average water flow in the interval segment, a water flow set F including m+2 monitored water flow values is established, F={Flow(i-1), Flow_t1, Flow_t2, …, Flow_ti, …, Flow_tm, Flowi}, Flow_ti is the ith monitored water flow value; The output power interval (W(i-1), Wi) of the speed regulating pump is divided by (m+2) to form an output power set W of the speed regulating pump including (m+2) output powers, W={W_ti1, W_ti2, …, W_ti, …, W_t(m+2)}, W_ti is the ith output power of the speed regulating pump obtained by the division, W_ti=W1-[(W2-W1) / (m+2)]*i, i=1, 2, 3…m+2; The clogging percentage interval (X(i-1), Xi) is divided by (m+2) to form a clogging percentage set X including (m+2) clogging percentages, X={X_ti1, X_ti2, …, X_ti, …, X_t(m+2)}, X_ti is the ith clogging percentage obtained by the division, X_ti=X1-[(X2-X1) / (m+2)]*i, i=1, 2, 3…m+2; The relationship between the output power and the water flow of the speed regulating pump and the relationship between the clogging degree of the filter and the output power of the speed regulating pump are reconstructed by combining the data in the sets F, W and X. It comprises:

10. A control system for accurate prompting of filter cleaning, characterized in that a pressure gauge and a flow sensor arranged on a closed water circuit, the closed water circuit comprising a speed regulating pump and a filter; an analysis module for analyzing the relationship among the output power, the water flow and the clogging degree of the filter of the speed regulating pump by the law of conservation of energy; a relationship construction module for, before the actual use of the closed water circuit, presetting a plurality of output powers of the speed regulating pump in a forward direction, monitoring the corresponding water flow under each output power, and constructing the relationship between the output power and the water flow of the speed regulating pump and the relationship between the clogging degree of the filter and the output power of the speed regulating pump by the relationship among the output power, the water flow and the clogging degree of the filter of the speed regulating pump; a filter cleaning control module for, in the actual use of the closed water circuit, acquiring the real-time water flow by the flow sensor, calculating the real-time output power of the speed regulating pump according to the relationship between the output power and the water flow of the speed regulating pump, calculating the real-time clogging degree of the filter by combining the relationship between the clogging degree of the filter and the output power of the speed regulating pump, and giving a cleaning control prompt for the filter according to the real-time clogging degree of the filter; a relationship reconstruction module for, after the cleaning of the filter each time, establishing a water flow confidence interval according to the current monitored water flow and the previously monitored water flow, and reconstructing the relationship between the output power and the water flow of the speed regulating pump and the relationship between the clogging degree of the filter and the output power of the speed regulating pump according to the water flow confidence interval; a display for displaying the real-time clogging degree of the filter. ​ 11. A computer readable storage medium having stored thereon a computer program, characterized in that: The computer program, when executed by the processor, implements the control method for accurate prompting of filter cleaning as claimed in any of claims 1-9.

12. A control device for accurate prompting of filter cleaning, characterized by: A computer program product comprising a memory, a processor and a computer program stored on the memory and loadable into the processor, the processor implementing the control method for accurate prompting of filter cleaning as claimed in any of claims 1-9 when executing the computer program.

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