Method and device for determining flow-limiting sectional area of drainage pipeline

Abstract

The invention relates to the technical field of household appliances, and provides a method and device for determining the flow-limiting sectional area of a drainage pipeline. The method comprises the steps that the water inlet pressure, the working time length and the drainage quality in the working time length of a drainage pipeline under the normal working state of the electromagnetic valve are determined; the water inlet pressure, the working duration, the drainage quality and the water inlet pipeline sectional area of the electromagnetic valve are substituted into a target formula, and the flow limiting sectional area of the drainage pipeline is obtained; wherein the target formula is obtained based on a water inlet Bernoulli equation and a water outlet Bernoulli equation of the electromagnetic valve. According to the method and the device for determining the flow-limiting sectional area of the drainage pipeline, the defects that in the prior art, measuring equipment is expensive, operation is tedious, and the flow-limiting sectional area of an irregular pipeline is difficult to directly determine are overcome, and compared with a traditional X-ray measuring method, the detection cost and the operation complexity can be remarkably reduced; the method is suitable for regular pipeline structures and irregular pipeline structures.

Description

Technical Field

[0001] This invention relates to the field of home appliance technology, and in particular to a method and apparatus for determining the flow-limiting cross-sectional area of ​​a drainage pipe. Background Technology

[0002] Home appliances typically use solenoid valves for drainage, such as washing machines, dishwashers, water purifiers, and coffee machines.

[0003] During long-term use, solenoid valves are prone to blockage due to the accumulation of dirt and scale in drainage pipes, which reduces the cross-sectional area. Therefore, determining the cross-sectional area of ​​the minimum flow-limiting position inside the drainage pipe (hereinafter referred to as the "flow-limiting cross-sectional area") is of great significance for judging the blockage of the solenoid valve. Summary of the Invention

[0004] This invention aims to at least solve one of the technical problems existing in related technologies. To this end, this invention proposes a method for determining the flow-limiting cross-sectional area of ​​a drainage pipe, which can determine the flow-limiting cross-sectional area of ​​the drainage pipe in a low-cost and efficient manner.

[0005] A method for determining the flow-limiting cross-sectional area of ​​a drainage pipe according to a first aspect of the present invention includes: Determine the inlet pressure, operating time, and drainage quality of the drain pipe under normal operating conditions of the solenoid valve; Substituting the inlet pressure, the working time, the drainage quality, and the cross-sectional area of ​​the inlet pipe of the solenoid valve into the target formula, the flow-limiting cross-sectional area of ​​the drainage pipe is obtained. The target formula is derived based on Bernoulli's equations for the inlet and outlet of the solenoid valve.

[0006] The present invention provides a method for determining the flow-limiting cross-sectional area of ​​a drainage pipe. This method measures the inlet water pressure, operating time, and drainage quality under normal operating conditions of the solenoid valve, and combines this with the cross-sectional area of ​​the inlet pipe to accurately calculate the flow-limiting cross-sectional area of ​​the drainage pipe using Bernoulli's equation. This method overcomes the shortcomings of existing technologies, such as expensive measuring equipment, cumbersome operation, and difficulty in directly determining the flow-limiting cross-sectional area of ​​irregular pipes. Compared with traditional X-ray measurement methods, it significantly reduces detection costs and operational complexity, and is applicable to both regular and irregular pipe structures.

[0007] According to one embodiment of the present invention, the target formula is determined in the following manner: When the inlet and outlet of the solenoid valve are horizontal, an expression for the difference between the inlet pressure and the outlet pressure is determined based on the Bernoulli equation for the inlet and the Bernoulli equation for the outlet. When the outlet water pressure is atmospheric pressure, the expression for the inlet water pressure is determined based on the expression for the difference between the inlet water pressure and the outlet water pressure; Substituting the flow rate of the solenoid valve, the cross-sectional area of ​​the inlet pipe, and the flow-limiting cross-sectional area of ​​the drain pipe into the expression for the inlet pressure, we obtain the expression for the flow-limiting cross-sectional area of ​​the drain pipe. By replacing the flow rate of the solenoid valve in the expression for the flow-limiting cross-sectional area of ​​the drainage pipe with the working time, the drainage mass, and the water density, the target formula is obtained.

[0008] The present invention provides a method for determining the flow-limiting cross-sectional area of ​​drainage pipes. This method derives expressions for the difference between inlet and outlet pressures based on Bernoulli's equations for the inlet and outlet of the solenoid valve when both inlet and outlet are horizontal. It then determines the expression for the inlet pressure when the outlet pressure is atmospheric pressure. By substituting the flow rate, inlet pipe cross-sectional area, and flow-limiting cross-sectional area into the expression for inlet pressure, the expression for the flow-limiting cross-sectional area is derived. Finally, the flow rate is replaced with working time, drainage quality, and water density to generate the target formula. This method enables rapid and accurate calculation of the flow-limiting cross-sectional area of ​​drainage pipes, allows for flexible solenoid valve detection in various application scenarios, supports compatibility with different pipe structures and equipment conditions, significantly enhances engineering applicability, and overcomes the shortcomings of existing methods that are difficult to adapt to on-site environmental detection.

[0009] According to one embodiment of the present invention, the target formula is: in, The flow-limiting cross-sectional area of ​​the drainage pipe; The drainage mass; The density of the water; The duration of the operation; The inlet water pressure; The cross-sectional area of ​​the water inlet pipe is given.

[0010] According to one embodiment of the present invention, the method further includes: Determine the first flow-limiting cross-sectional area and the second flow-limiting cross-sectional area of ​​the solenoid valve; the first flow-limiting cross-sectional area is the flow-limiting cross-sectional area of ​​the drainage pipe after the solenoid valve is used, and the second flow-limiting cross-sectional area is the flow-limiting cross-sectional area of ​​the drainage pipe when the solenoid valve leaves the factory. The blockage status of the solenoid valve is determined based on the first flow-limiting cross-sectional area and the second flow-limiting cross-sectional area.

[0011] According to one embodiment of the present invention, the method further includes: Determine the first flow-limiting cross-sectional area of ​​the solenoid valve, and the measured inner diameter of the drainage pipe when the solenoid valve leaves the factory; the first flow-limiting cross-sectional area is the flow-limiting cross-sectional area of ​​the drainage pipe after the solenoid valve is used. Based on the first flow-limiting cross-sectional area and the measured value of the inner diameter, the blockage status of the solenoid valve is determined.

[0012] According to one embodiment of the present invention, determining the blockage status of the solenoid valve includes: The degree of blockage of the solenoid valve is determined based on the quotient of the first flow-limiting cross-sectional area and the second flow-limiting cross-sectional area.

[0013] According to a second aspect of the present invention, the present invention provides a device for determining the flow-limiting cross-sectional area of ​​a drainage pipe, comprising: The determination module is used to determine the inlet water pressure, working time, and drainage quality of the drainage pipe under normal working conditions of the solenoid valve. The calculation module is used to substitute the inlet water pressure, the working time, the drainage quality, and the cross-sectional area of ​​the inlet pipe of the solenoid valve into the target formula to obtain the flow-limiting cross-sectional area of ​​the drainage pipe. The target formula is derived based on Bernoulli's equations for the inlet and outlet of the solenoid valve.

[0014] The present invention provides a method for determining the flow-limiting cross-sectional area of ​​a drainage pipe. This method measures the inlet water pressure, operating time, and drainage quality under normal operating conditions of the solenoid valve, and combines this with the cross-sectional area of ​​the inlet pipe to accurately calculate the flow-limiting cross-sectional area of ​​the drainage pipe using Bernoulli's equation. This method overcomes the shortcomings of existing technologies, such as expensive measuring equipment, cumbersome operation, and difficulty in directly determining the flow-limiting cross-sectional area of ​​irregular pipes. Compared with traditional X-ray measurement methods, it significantly reduces detection costs and operational complexity, and is applicable to both regular and irregular pipe structures.

[0015] According to a third aspect of the present invention, the present invention provides an electronic device, 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 method for determining the flow-limiting cross-sectional area of ​​a drainage pipe as described in the first aspect above.

[0016] According to a fourth aspect of the present invention, the present invention provides a non-transitory computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the method for determining the flow-limiting cross-sectional area of ​​a drainage pipe as described in the first aspect above.

[0017] According to a fifth aspect of the present invention, the present invention also provides a computer program product, including a computer program that, when executed by a processor, implements the method for determining the flow-limiting cross-sectional area of ​​a net drainage pipe as described in the first aspect above.

[0018] The above-described one or more technical solutions in the embodiments of the present invention have at least one of the following technical effects: The present invention provides a method for determining the flow-limiting cross-sectional area of ​​a drainage pipe by replacing the flow rate expression with the working time, the drainage mass, and the water density, thereby obtaining the expression for the flow-limiting cross-sectional area of ​​the drainage pipe. This method can be continuously applied to the monitoring of the flow capacity of solenoid valves in various devices, providing stable and reliable data support for long-term operational status assessment, while improving the simplicity and practicality of the detection process.

[0019] Furthermore, the method for determining the flow-limiting cross-sectional area of ​​a drainage pipe provided by this invention, by comparing the first flow-limiting cross-sectional area after the solenoid valve has been used with the second flow-limiting cross-sectional area predetermined at the factory, can quantify the degree of attenuation of the pipe's flow capacity without additional actual measurement, providing users with clear maintenance decisions, thereby helping to extend the service life of the solenoid valve and improve overall operational reliability.

[0020] Furthermore, the method for determining the flow-limiting cross-sectional area of ​​a drainage pipe provided by this invention can quantify the degree of blockage in the drainage pipe by comparing the first flow-limiting cross-sectional area after the solenoid valve is used with the measured value of the inner diameter of the drainage pipe obtained at the factory. This provides users with clear maintenance decision support, thereby helping to extend the service life of the solenoid valve and improve the overall operational reliability.

[0021] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of the present invention or related technologies, the drawings used in the description of the embodiments or related technologies will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a flowchart illustrating the method for determining the flow-limiting cross-sectional area of ​​a drainage pipe provided by the present invention.

[0024] Figure 2 This is a flowchart illustrating the process of determining the target formula provided by the present invention.

[0025] Figure 3This is a schematic diagram of the structure of the drainage pipe flow-limiting cross-sectional area layout and connection provided by the present invention.

[0026] Figure 4 This is a schematic diagram of the structure of the drainage pipe flow-limiting cross-sectional area determination device provided by the present invention.

[0027] Figure 5 This is a schematic diagram of the structure of the electronic device provided by the present invention. Detailed Implementation

[0028] The embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate the present invention, but should not be used to limit the scope of the invention. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0029] Figure 1 This is a flowchart illustrating the method for determining the flow-limiting cross-sectional area of ​​a drainage pipe provided by the present invention, as shown below. Figure 1 As shown, the method may include the following steps: Step 110: Determine the inlet water pressure, working time, and drainage quality of the drain pipe under normal operating conditions of the solenoid valve. Step 120: Substitute the inlet water pressure, working time, drainage quality, and the cross-sectional area of ​​the inlet pipe of the solenoid valve into the target formula to obtain the flow-limiting cross-sectional area of ​​the drainage pipe. The target formula is derived from Bernoulli's equations for the inlet and outlet of the solenoid valve.

[0030] It should be noted that the subject executing the above method for determining the flow-limiting cross-sectional area of ​​drainage pipes can be various household appliances, such as washing machines, dishwashers, water purifiers, water softeners, etc., or it can be solenoid valve detection equipment, embedded microprocessors, dedicated computing devices, or mobile terminals loaded with water purifier or water softener application software, etc.

[0031] For ease of explanation, the following description uses the determination of the flow-limiting cross-sectional area of ​​the drainage pipe of a water purifier's wastewater solenoid valve as an example to illustrate the method for determining the flow-limiting cross-sectional area of ​​the drainage pipe of the present invention.

[0032] It should be understood that this example should not be construed as limiting the scope of protection of this invention. Based on the common understanding of those skilled in the art, the technical solution of this invention can be applied to at least the various scenarios exemplified in the background art, such as washing machines, dishwashers, etc., which will not be listed here one by one.

[0033] In the process of developing this invention, the applicant discovered the following problems in determining the flow-limiting cross-sectional area of ​​the drainage pipe: When drainage pipes have a regular structure, it is necessary to use methods such as X-rays to measure the inner diameter of the pipes to determine the flow-limiting cross-sectional area, which is costly. When drainage pipes have irregular structures, it is difficult to directly determine the flow-limiting cross-sectional area of ​​the drainage pipes.

[0034] In step 110, the inlet water pressure refers to the static pressure of the fluid at the inlet of the solenoid valve, which is a key parameter affecting the flow rate in the drainage pipe. The inlet water pressure can be directly measured by a pressure sensor installed on the inlet pipe, or it can be adjusted to other measurement methods according to the specific scenario to adapt to different models of solenoid valves or operating environments. This invention does not impose specific limitations on this.

[0035] Drainage mass refers to the mass of water discharged through the solenoid valve during the operating time. Drainage mass can be obtained indirectly by weighing it using an electronic scale. Alternatively, other measurement methods can be used depending on the specific scenario to adapt to different types of solenoid valves or operating environments. This invention does not impose any specific limitations on these methods.

[0036] In step 120, the cross-sectional area of ​​the water inlet pipe refers to the cross-sectional area of ​​the water inlet of the pipe, which can be the original design value when the pipe leaves the factory.

[0037] Specifically, the flow-limiting cross-sectional area of ​​a drainage pipe refers to the cross-sectional area of ​​the minimum flow-limiting position inside the drainage pipe, reflecting the pipe's flow capacity and directly affecting the flow rate and efficiency of wastewater discharge.

[0038] Specifically, Bernoulli's equation describes the energy conservation relationship in the flow process of an ideal fluid. Its general form is: in, It represents the static pressure of the fluid. For the density of the fluid, The fluid velocity. It is the acceleration due to gravity. The height of the fluid relative to the reference plane.

[0039] In this invention, the Bernoulli equation for the inlet can be expressed as: in, For inlet water pressure, For the density of water, The flow velocity at the inlet. It is the acceleration due to gravity. This refers to the height of the water inlet.

[0040] Bernoulli's equation for the outlet can be expressed as: in, For water pressure, For the density of water, The flow velocity at the outlet. It is the acceleration due to gravity. The height of the water outlet.

[0041] Specifically, in the scenario of solenoid valve drainage, firstly, the water pressure is measured using a pressure sensor installed on the inlet pipe to obtain the inlet pressure of the solenoid valve. Next, the operating time of the solenoid valve is recorded, i.e., the duration of the drainage process. Then, the mass of the drained water is weighed at the outlet of the drain pipe using an electronic scale to obtain the drainage mass within the operating time. Finally, the inlet pressure, operating time, drainage mass, and the cross-sectional area of ​​the solenoid valve's inlet pipe are substituted into the target formula to calculate the flow-limiting cross-sectional area of ​​the drain pipe. This target formula is based on the Bernoulli equation in fluid mechanics, establishing the relationship between inlet pressure, operating time, drainage mass, inlet pipe cross-sectional area, and the flow-limiting cross-sectional area of ​​the drain pipe by analyzing the fluid states at the inlet and outlet.

[0042] The present invention provides a method for determining the flow-limiting cross-sectional area of ​​a drainage pipe. This method measures the inlet water pressure, operating time, and drainage quality under normal operating conditions of the solenoid valve, and combines this with the cross-sectional area of ​​the inlet pipe to accurately calculate the flow-limiting cross-sectional area of ​​the drainage pipe using Bernoulli's equation. This method overcomes the shortcomings of existing technologies, such as expensive measuring equipment, cumbersome operation, and difficulty in directly determining the flow-limiting cross-sectional area of ​​irregular pipes. Compared with traditional X-ray measurement methods, it significantly reduces detection costs and operational complexity, and is applicable to both regular and irregular pipe structures.

[0043] In one embodiment, such as Figure 2 As shown, the target formula can be determined in the following way: Step 210: With the inlet and outlet of the solenoid valve horizontal, determine the expression for the difference between the inlet pressure and the outlet pressure based on the Bernoulli equations for the inlet and outlet. Step 220: When the outlet water pressure is atmospheric pressure, determine the expression for the inlet water pressure based on the expression for the difference between the inlet water pressure and the outlet water pressure; Step 230: Substitute the flow rate of the solenoid valve, the cross-sectional area of ​​the inlet pipe, and the flow-limiting cross-sectional area of ​​the drain pipe into the expression for the inlet pressure to obtain the expression for the flow-limiting cross-sectional area of ​​the drain pipe. Step 240: Replace the flow rate of the solenoid valve in the expression for the flow-limiting cross-sectional area of ​​the drainage pipe with the working time, drainage mass and water density to obtain the target formula.

[0044] In step 210, Bernoulli's equation The term represents the gravitational potential energy term, which is the effect of the fluid's height difference on the fluid's energy.

[0045] The constant term in Bernoulli's equation refers to the sum of energy conserved in an ideal fluid between two measuring points. When the two measuring points are in the same fluid system (like a pipe) and there is no external energy input or loss (such as friction, heat loss, etc.), this constant term remains constant between the two points.

[0046] Understandably, firstly, by keeping the inlet and outlet of the solenoid valve at the same horizontal position, the constant term in Bernoulli's equation has the same value between the inlet and outlet points, resulting in the following expression: in, For inlet water pressure, For the density of water, The flow velocity at the inlet. It is the acceleration due to gravity. For water pressure, The flow velocity at the outlet. It is the acceleration due to gravity. , These represent the heights of the inlet and outlet relative to the same reference plane, respectively.

[0047] Secondly, since there is no height difference between the inlet and outlet of the solenoid valve, = Therefore, the potential energy term can be considered as 0, and the following expression can be obtained: Furthermore, the expression for the difference between the inlet water pressure and the outlet water pressure is as follows: In step 220, if the outlet pressure is set to atmospheric pressure, the outlet static pressure will also be close to 0. At this point, the expression for the inlet pressure can be determined based on the difference between the inlet and outlet pressures: In step 230, firstly, the solenoid valve is a leak-free, branchless closed pipe, and the wastewater, as an incompressible fluid, maintains a constant flow rate at both the inlet and outlet. Therefore, the flow rate is equal everywhere, which can be expressed as follows: in, The current flow rate of the solenoid valve. The flow velocity at the inlet. The flow velocity at the outlet. The cross-sectional area of ​​the water inlet pipe is a known quantity. This refers to the flow-limiting cross-sectional area of ​​the drainage pipe.

[0048] Secondly, by combining the expression for the inlet pressure with the difference between the inlet and outlet pressures, we can obtain: Furthermore, by transforming the expression for inlet pressure, we obtain the expression relating the flow rate of the solenoid valve, the cross-sectional area of ​​the inlet pipe, the flow-limiting cross-sectional area of ​​the outlet pipe, and the inlet pressure: Specifically, such as Figure 3 As shown, the initial water source is 0-pressure water 310. A booster pump 320 increases the water pressure, and a pressure gauge 330 measures the pressure of the water flowing into the wastewater valve 340. The outlet of the wastewater valve 340 is directly connected to atmospheric pressure 360. Additionally, a flow meter 350 is used to measure the actual discharge flow rate of the wastewater valve. To ensure the accuracy of the theoretical derivation, the inlet and outlet pipes are arranged on the same horizontal plane to eliminate the influence of height difference on the pressure analysis.

[0049] First, in the scenario of solenoid valve drainage, assuming that the inlet and outlet of the solenoid valve are in a horizontal state, we derive a theoretical expression for the difference between the inlet and outlet pressures by using Bernoulli's equations for the inlet and outlet, combined with the assumption of a horizontal pipe structure, thus laying the foundation for subsequent calculations.

[0050] Next, with the outlet pressure of wastewater valve 340 at atmospheric pressure 360, based on the above pressure difference expression, the expression for inlet pressure is further derived, generating an inlet pressure expression that includes inlet pressure, flow velocity, and density, providing a basis for the subsequent derivation of cross-sectional area.

[0051] Subsequently, flow meter 350 measures the flow rate of wastewater valve 340, reflecting the wastewater discharge rate; the cross-sectional area of ​​the inlet pipe is determined by the known standard inlet pipe cross-sectional area; the flow-limiting cross-sectional area of ​​the drainage pipe is used as a variable in the narrow section of the drainage pipe of wastewater valve 340. Substituting the flow rate data of flow meter 350 and the cross-sectional area of ​​the pipe structure into the inlet pressure expression provided by pressure gauge 330, and combining it with Bernoulli's equation, the expression for the flow-limiting cross-sectional area of ​​the drainage pipe is obtained.

[0052] Finally, by replacing the flow rate in the flow-limiting cross-sectional area expression with the working time, drainage mass, and water density, the target formula is obtained.

[0053] The present invention provides a method for determining the flow-limiting cross-sectional area of ​​drainage pipes. This method derives expressions for the difference between inlet and outlet pressures based on Bernoulli's equations for the inlet and outlet of the solenoid valve when both inlet and outlet are horizontal. It then determines the expression for the inlet pressure when the outlet pressure is atmospheric pressure. By substituting the flow rate, inlet pipe cross-sectional area, and flow-limiting cross-sectional area into the expression for inlet pressure, the expression for the flow-limiting cross-sectional area is derived. Finally, the flow rate is replaced with working time, drainage quality, and water density to generate the target formula. This method enables rapid and accurate calculation of the flow-limiting cross-sectional area of ​​drainage pipes, allows for flexible solenoid valve detection in various application scenarios, supports compatibility with different pipe structures and equipment conditions, significantly enhances engineering applicability, and overcomes the shortcomings of existing methods that are difficult to adapt to on-site environmental detection.

[0054] In one embodiment, the target formula can be: in, This refers to the flow-limiting cross-sectional area of ​​the drainage pipe. For drainage quality, For the density of water, For working hours, For inlet water pressure, This represents the cross-sectional area of ​​the water inlet pipe.

[0055] Specifically, the flow rate can be measured indirectly by an electronic scale or by a flow meter. Other measurement methods can also be adjusted according to the specific scenario to adapt to different solenoid valve models or usage environments. This invention does not impose any specific limitations on these methods.

[0056] Specifically, firstly, based on the fundamental principles of fluid mechanics, the current flow rate can be determined by the following expression: in, For the current traffic, For the current flow rate, For working hours, For the quality of the drainage at that time, The density of the fluid.

[0057] For example, in the scenario of solenoid valve drainage, the working time is The density of the fluid is The drainage quality is The current flow rate is 100%. .

[0058] Subsequently, the flow rate in the expression for the flow-limiting cross-sectional area of ​​the drainage pipe is replaced with the above formula to obtain the target formula.

[0059] The present invention provides a method for determining the flow-limiting cross-sectional area of ​​a drainage pipe by replacing the flow rate expression with the working time, the drainage mass, and the water density, thereby obtaining the expression for the flow-limiting cross-sectional area of ​​the drainage pipe. This method can be continuously applied to the monitoring of the flow capacity of solenoid valves in various devices, providing stable and reliable data support for long-term operational status assessment, while improving the simplicity and practicality of the detection process.

[0060] In one embodiment, the method may further include: Determine the first flow-limiting cross-sectional area and the second flow-limiting cross-sectional area of ​​the solenoid valve; the first flow-limiting cross-sectional area is the flow-limiting cross-sectional area of ​​the drainage pipe after the solenoid valve is used, and the second flow-limiting cross-sectional area is the flow-limiting cross-sectional area of ​​the drainage pipe when the solenoid valve leaves the factory. The blockage status of the solenoid valve is determined based on the first and second flow-limiting cross-sectional areas.

[0061] Specifically, the first flow-limiting cross-sectional area refers to the flow-limiting cross-sectional area of ​​the drainage pipe after the solenoid valve has been used for a period of time, reflecting the current flow capacity of the pipe.

[0062] The second flow-limiting cross-sectional area refers to the flow-limiting cross-sectional area of ​​the drainage pipe that has been predetermined at the factory when the solenoid valve leaves the factory, serving as the initial benchmark value for flow capacity.

[0063] The period of use refers to the time interval between the time a valve is put into use at the factory and the time of actual measurement. It can be several weeks, several months or several years. It can also be adjusted to other time intervals according to the TDS concentration in the wastewater, the frequency of use, maintenance requirements or the use scenario, so as to adapt to different solenoid valve models or use environments. This invention does not make specific limitations on this.

[0064] Specifically, the blockage of the solenoid valve can be determined in various ways, such as the quotient of the first flow limiting cross-sectional area and the second flow limiting cross-sectional area, the absolute difference method, the percentage change method, etc. Other measurement methods can also be adjusted according to the specific scenario to adapt to different solenoid valve models or usage environments. This invention does not make specific limitations in this regard.

[0065] For example, in a solenoid valve drainage scenario, the second flow-limiting cross-sectional area represents the optimal flow state at the factory, while the first flow-limiting cross-sectional area may decrease due to scale accumulation caused by wastewater with high TDS. The solenoid valve's blockage status is determined by comparing the first and second flow-limiting cross-sectional areas. If the first flow-limiting cross-sectional area is significantly smaller than the second, it indicates that the solenoid valve may be blocked. If the difference exceeds a preset threshold, a maintenance alarm is triggered, prompting the user to clean or replace the valve.

[0066] The preset threshold can be set using methods such as proportional thresholding, relative difference, or interval-based level judgment. It can also be adjusted to other methods depending on the application scenario to adapt to different solenoid valve models or application environments. This invention does not impose any specific limitations on this.

[0067] As shown in Table 1, the actual flow-limiting cross-sectional area was measured under different conditions of downstream pump pressure, drainage time, and drainage quality. The estimated flow-limiting cross-sectional area was then calculated using the target formula derived from Bernoulli's equation. During the experiment, the inlet water pressure was adjusted using a booster pump; the drainage quality and drainage time were measured using an electronic scale and a timer; and the discharge rate was calibrated using a flow meter. Finally, by substituting the data into the formula, the estimated flow-limiting cross-sectional area of ​​the drainage pipe and its corresponding equivalent diameter were obtained.

[0068] Table 1. Measured and estimated data of flow-limiting cross-sectional area under different pipe diameters.

[0069] The method for determining the flow-limiting cross-sectional area of ​​a drainage pipe provided by this invention compares the first flow-limiting cross-sectional area after the solenoid valve has been used with the second flow-limiting cross-sectional area predetermined at the factory. This allows for the quantification of the attenuation of the pipe's flow capacity without additional actual measurement, providing users with clear maintenance decisions. This helps to extend the service life of the solenoid valve and improve overall operational reliability.

[0070] In one embodiment, determining the blockage status of the solenoid valve may include: The degree of blockage of the solenoid valve is determined by the quotient of the first flow-limiting cross-sectional area and the second flow-limiting cross-sectional area.

[0071] Specifically, the quotient of the first flow-limiting cross-sectional area and the second flow-limiting cross-sectional area refers to the ratio of the first flow-limiting cross-sectional area to the second flow-limiting cross-sectional area. The smaller the ratio, the more severe the blockage.

[0072] For example, in the scenario of solenoid valve drainage, the second flow-limiting cross-sectional area represents the optimal flow state at the factory, while the first flow-limiting cross-sectional area may decrease due to scale accumulation caused by wastewater with high TDS. Subsequently, the degree of blockage of the solenoid valve is determined based on the quotient of the first and second flow-limiting cross-sectional areas.

[0073] Ideally, the ratio of the first flow-limiting cross-sectional area to the second flow-limiting cross-sectional area should be 1. If the ratio decreases, it indicates that the flow capacity of the wastewater valve has decreased. If the ratio of the first flow-limiting cross-sectional area to the second flow-limiting cross-sectional area is less than a first threshold, a maintenance alarm will be triggered, prompting the user to clean or replace the valve.

[0074] The first threshold can be a proportional threshold, such as 0.9, 0.8, 0.7, etc., or it can be adjusted to other values ​​according to the usage scenario to adapt to different solenoid valve models or usage environments. This invention does not make specific limitations in this regard.

[0075] The method for determining the flow-limiting cross-sectional area of ​​a drainage pipe provided by this invention can efficiently quantify the degree of attenuation of the flow capacity of the drainage pipe by calculating the ratio of the first flow-limiting cross-sectional area after the solenoid valve is used to the second flow-limiting cross-sectional area preset at the factory, thereby realizing rapid diagnosis of the solenoid valve's operating status and effectively shortening the response time and maintenance cycle.

[0076] In one embodiment, the method may further include: Determine the first flow-limiting cross-sectional area of ​​the solenoid valve, and the actual measured value of the inner diameter of the drainage pipe when the solenoid valve leaves the factory; the first flow-limiting cross-sectional area is the flow-limiting cross-sectional area of ​​the drainage pipe after the solenoid valve is used. Based on the measured values ​​of the first flow-limiting cross-sectional area and the inner diameter, the blockage status of the solenoid valve is determined.

[0077] Specifically, the first flow-limiting cross-sectional area refers to the flow-limiting cross-sectional area of ​​the drainage pipe after the solenoid valve has been used for a period of time, reflecting the current flow capacity of the pipe.

[0078] The measured inner diameter of the drainage pipe can be obtained at the factory using measuring equipment and used as the initial reference value for the equipment.

[0079] The usage time refers to the time interval between the time a valve is put into use at the factory and the time between actual measurement. It can be several weeks, several months or several years. It can also be adjusted to other time intervals according to the TDS concentration in the wastewater, the frequency of use, maintenance requirements or usage scenarios, so as to adapt to different solenoid valve models or usage environments. This invention does not make specific limitations on this.

[0080] For example, in a scenario involving solenoid valve drainage, the measured inner diameter of the drainage pipe refers to the baseline value obtained at the factory using measuring equipment. However, the first flow-limiting cross-sectional area may decrease due to scale accumulation caused by wastewater with high TDS. The first flow-limiting cross-sectional area is then converted into an equivalent diameter, which is compared with the measured inner diameter. Finally, the degree of blockage in the solenoid valve is determined based on the quotient of the equivalent diameter and the measured inner diameter.

[0081] Ideally, the ratio of the equivalent diameter to the measured inner diameter should be 1. If the ratio decreases, it indicates a decrease in the flow capacity of the wastewater valve. If the ratio of the equivalent diameter to the measured inner diameter is less than a second threshold, a maintenance alarm will be triggered, prompting the user to clean or replace the valve.

[0082] The second threshold can be a proportional threshold, such as 0.5, 0.4, or 0.3, or it can be adjusted to other values ​​depending on the usage scenario to suit different solenoid valve models or usage environments. This invention does not impose specific limitations on this. Under the same conditions, the second threshold should be less than the first threshold to ensure the accuracy of the judgment on the degree of blockage in the drainage pipe.

[0083] The method for determining the flow-limiting cross-sectional area of ​​a drainage pipe provided by this invention can quantify the degree of blockage in the drainage pipe by comparing the first flow-limiting cross-sectional area after the solenoid valve is used with the measured value of the inner diameter of the drainage pipe obtained at the factory. This provides users with clear maintenance decision support, thereby helping to extend the service life of the solenoid valve and improve the overall operational reliability.

[0084] The flow-limiting cross-sectional area determination device for drainage pipes provided by the present invention will be described below. The flow-limiting cross-sectional area determination device for drainage pipes described below can be referred to in correspondence with the flow-limiting cross-sectional area determination method for drainage pipes described above, and can achieve the same technical effect. It will not be described again here.

[0085] Figure 4 This is a schematic diagram of the structure of the drainage pipe flow-limiting cross-sectional area determination device provided by the present invention, as shown below. Figure 4 As shown, the device may include: The determination module 410 is used to determine the inlet pressure, working time, and drainage quality of the drainage pipe under normal working conditions of the solenoid valve. The calculation module 420 is used to substitute the inlet water pressure, the working time, the drainage quality and the cross-sectional area of ​​the inlet pipe of the solenoid valve into the target formula to obtain the flow-limiting cross-sectional area of ​​the drainage pipe. The target formula is derived based on Bernoulli's equations for the inlet and outlet of the solenoid valve.

[0086] In one embodiment, the target formula is determined as follows: When the inlet and outlet of the solenoid valve are horizontal, an expression for the difference between the inlet pressure and the outlet pressure is determined based on the Bernoulli equation for the inlet and the Bernoulli equation for the outlet. When the outlet water pressure is atmospheric pressure, the expression for the inlet water pressure is determined based on the expression for the difference between the inlet water pressure and the outlet water pressure; Substituting the flow rate of the solenoid valve, the cross-sectional area of ​​the inlet pipe, and the flow-limiting cross-sectional area of ​​the drain pipe into the expression for the inlet pressure, we obtain the expression for the flow-limiting cross-sectional area of ​​the drain pipe. By replacing the flow rate of the solenoid valve in the expression for the flow-limiting cross-sectional area of ​​the drainage pipe with the working time, the drainage mass, and the water density, the target formula is obtained.

[0087] In one embodiment, the target formula is: in, The flow-limiting cross-sectional area of ​​the drainage pipe; The drainage mass; The density of the water; The duration of the operation; The inlet water pressure; The cross-sectional area of ​​the water inlet pipe is given.

[0088] In one embodiment, the device further includes a current-limiting cross-sectional area comparison module (not shown in the figure), used for: Determine the first flow-limiting cross-sectional area and the second flow-limiting cross-sectional area of ​​the solenoid valve; the first flow-limiting cross-sectional area is the flow-limiting cross-sectional area of ​​the drainage pipe after the solenoid valve is used, and the second flow-limiting cross-sectional area is the flow-limiting cross-sectional area of ​​the drainage pipe when the solenoid valve leaves the factory. The blockage status of the solenoid valve is determined based on the first flow-limiting cross-sectional area and the second flow-limiting cross-sectional area.

[0089] In one embodiment, the current-limiting cross-sectional area comparison module is specifically used for: The degree of blockage of the solenoid valve is determined based on the quotient of the first flow-limiting cross-sectional area and the second flow-limiting cross-sectional area.

[0090] In one embodiment, the current-limiting cross-sectional area comparison module is further configured to: Determine the first flow-limiting cross-sectional area of ​​the solenoid valve, and the measured inner diameter of the drainage pipe when the solenoid valve leaves the factory; the first flow-limiting cross-sectional area is the flow-limiting cross-sectional area of ​​the drainage pipe after the solenoid valve is used. Based on the first flow-limiting cross-sectional area and the measured value of the inner diameter, the blockage status of the solenoid valve is determined.

[0091] Figure 5 An example is a schematic diagram of the physical structure of an electronic device, such as... Figure 5 As shown, the electronic device may include: a processor 510, a communication interface 520, a memory 530, and a communication bus 540, wherein the processor 510, the communication interface 520, and the memory 530 communicate with each other via the communication bus 540. The processor 510 can call logical instructions in the memory 530 to execute the method for determining the flow-limiting cross-sectional area of ​​the drainage pipe as described in any of the above embodiments, for example including: Determine the inlet pressure, operating time, and drainage quality of the drain pipe under normal operating conditions of the solenoid valve; Substituting the inlet pressure, the working time, the drainage quality, and the cross-sectional area of ​​the inlet pipe of the solenoid valve into the target formula, the flow-limiting cross-sectional area of ​​the drainage pipe is obtained. The target formula is derived based on Bernoulli's equations for the inlet and outlet of the solenoid valve.

[0092] Furthermore, the logical instructions in the aforementioned memory 530 can be implemented as software functional units and, when sold or used as independent products, can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art, or a part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0093] On the other hand, the present invention also provides a non-transitory computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the method for determining the flow-limiting cross-sectional area of ​​a drainage pipe as described in any of the above embodiments, for example including: Determine the inlet pressure, operating time, and drainage quality of the drain pipe under normal operating conditions of the solenoid valve; Substituting the inlet pressure, the working time, the drainage quality, and the cross-sectional area of ​​the inlet pipe of the solenoid valve into the target formula, the flow-limiting cross-sectional area of ​​the drainage pipe is obtained. The target formula is derived based on Bernoulli's equations for the inlet and outlet of the solenoid valve.

[0094] In another aspect, the present invention also provides a computer program product, the computer program product comprising a computer program that can be stored on a non-transitory computer-readable storage medium, wherein when the computer program is executed by a processor, the computer is capable of executing the method for determining the flow-limiting cross-sectional area of ​​a drainage pipe as described in any of the above embodiments, for example including: Determine the inlet pressure, operating time, and drainage quality of the drain pipe under normal operating conditions of the solenoid valve; Substituting the inlet pressure, the working time, the drainage quality, and the cross-sectional area of ​​the inlet pipe of the solenoid valve into the target formula, the flow-limiting cross-sectional area of ​​the drainage pipe is obtained. The target formula is derived based on Bernoulli's equations for the inlet and outlet of the solenoid valve.

[0095] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs. Those skilled in the art can understand and implement this without any creative effort.

[0096] Through the above description of the embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus necessary general-purpose hardware platforms, and of course, it can also be implemented by hardware. Based on this understanding, the above technical solutions, in essence or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute the methods described in the various embodiments or some parts of the embodiments.

[0097] Finally, it should be noted that the above embodiments are only for illustrating the present invention and not for limiting the present invention. Although the present invention has been described in detail with reference to the embodiments, those skilled in the art should understand that various combinations, modifications, or equivalent substitutions of the technical solutions of the present invention do not depart from the spirit and scope of the technical solutions of the present invention and should be covered within the scope of the claims of the present invention.

Claims

1. A method for determining the flow-limiting cross-sectional area of ​​a drainage pipe, characterized in that, include: Determine the inlet pressure, operating time, and drainage quality of the drain pipe under normal operating conditions of the solenoid valve; Substituting the inlet pressure, the working time, the drainage quality, and the cross-sectional area of ​​the inlet pipe of the solenoid valve into the target formula, the flow-limiting cross-sectional area of ​​the drainage pipe is obtained. The target formula is derived based on Bernoulli's equations for the inlet and outlet of the solenoid valve.

2. The method for determining the flow-limiting cross-sectional area of ​​a drainage pipe according to claim 1, characterized in that, The target formula is determined in the following way: When the inlet and outlet of the solenoid valve are horizontal, an expression for the difference between the inlet pressure and the outlet pressure is determined based on the Bernoulli equation for the inlet and the Bernoulli equation for the outlet. When the outlet water pressure is atmospheric pressure, the expression for the inlet water pressure is determined based on the expression for the difference between the inlet water pressure and the outlet water pressure; Substituting the flow rate of the solenoid valve, the cross-sectional area of ​​the inlet pipe, and the flow-limiting cross-sectional area of ​​the drain pipe into the expression for the inlet pressure, we obtain the expression for the flow-limiting cross-sectional area of ​​the drain pipe. By replacing the flow rate of the solenoid valve in the expression for the flow-limiting cross-sectional area of ​​the drainage pipe with the working time, the drainage mass, and the water density, the target formula is obtained.

3. The method for determining the flow-limiting cross-sectional area of ​​a drainage pipe according to claim 2, characterized in that, The target formula is: in, The flow-limiting cross-sectional area of ​​the drainage pipe; The drainage mass; The density of the water; The duration of the operation; The inlet water pressure; The cross-sectional area of ​​the water inlet pipe is given.

4. The method for determining the flow-limiting cross-sectional area of ​​a drainage pipe according to any one of claims 1-3, characterized in that, The method further includes: Determine the first flow-limiting cross-sectional area and the second flow-limiting cross-sectional area of ​​the solenoid valve; the first flow-limiting cross-sectional area is the flow-limiting cross-sectional area of ​​the drainage pipe after the solenoid valve is used, and the second flow-limiting cross-sectional area is the flow-limiting cross-sectional area of ​​the drainage pipe when the solenoid valve leaves the factory. The blockage status of the solenoid valve is determined based on the first flow-limiting cross-sectional area and the second flow-limiting cross-sectional area.

5. The method for determining the flow-limiting cross-sectional area of ​​a drainage pipe according to any one of claims 1-3, characterized in that, The method further includes: Determine the first flow-limiting cross-sectional area of ​​the solenoid valve, and the measured inner diameter of the drainage pipe when the solenoid valve leaves the factory; the first flow-limiting cross-sectional area is the flow-limiting cross-sectional area of ​​the drainage pipe after the solenoid valve is used. Based on the first flow-limiting cross-sectional area and the measured value of the inner diameter, the blockage status of the solenoid valve is determined.

6. The method for determining the flow-limiting cross-sectional area of ​​a drainage pipe according to claim 4, characterized in that, Determining the blockage status of the solenoid valve includes: The degree of blockage of the solenoid valve is determined based on the quotient of the first flow-limiting cross-sectional area and the second flow-limiting cross-sectional area.

7. A device for determining the flow-limiting cross-sectional area of ​​a drainage pipe, characterized in that, include: The determination module is used to determine the inlet water pressure, working time, and drainage quality of the drainage pipe under normal working conditions of the solenoid valve. The calculation module is used to substitute the inlet water pressure, the working time, the drainage quality, and the cross-sectional area of ​​the inlet pipe of the solenoid valve into the target formula to obtain the flow-limiting cross-sectional area of ​​the drainage pipe. The target formula is derived based on Bernoulli's equations for the inlet and outlet of the solenoid valve.

8. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the computer program, it implements the method for determining the flow-limiting cross-sectional area of ​​the drainage pipe as described in any one of claims 1 to 6.

9. A non-transitory 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 method for determining the flow-limiting cross-sectional area of ​​the drainage pipe as described in any one of claims 1 to 6.

10. A computer program product, comprising a computer program, characterized in that, When the computer program is executed by the processor, it implements the method for determining the flow-limiting cross-sectional area of ​​the drainage pipe as described in any one of claims 1 to 6.

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