WO2023024510A1 - Control method and apparatus for opening degree of valve, and non-volatile storage medium and processor - Google Patents

Abstract

Disclosed is a method for controlling the opening degree of a valve. The method comprises: on the basis of a target flow value, determining a target opening degree value corresponding to a valve under the current pressure difference; adjusting the current opening degree value of the valve to the target opening degree value, and calculating the actual flow value of a fluid that flows through the valve; and when the actual flow value is not equal to the target flow value, adjusting the current opening degree value of the valve, so that the difference between the actual flow value and the target flow value falls within a preset flow value range. By means of the method, the problem of it being difficult to adjust the opening degree of a valve according to a flow requirement is solved. Further disclosed are a control apparatus for the opening degree of a valve, and a non-volatile storage medium and a processor.

Description

Valve opening control method, device, non-volatile storage medium and processor

This application claims the priority of the Chinese patent application submitted to the China Patent Office on August 23, 2021, with the application number 202110971059.5, and the title of the invention is "Valve Opening Control Method, Device, Non-volatile Storage Medium and Processor" , the entire contents of which are incorporated in this application by reference.

technical field

The present application relates to the technical field of valve control, in particular, to a control method, device, non-volatile storage medium and processor for valve opening.

Background technique

In order to regulate the flow, various valves appear in related technologies, for example, a constant flow valve, ie a constant flow regulating valve, has a constant flow regulating function and can meet the flow regulation requirement under the constant flow requirement.

The constant flow valve is a valve that combines a self-operated pressure difference control device and a flow adjustment device. Its working principle is: use a pressure difference control device to control and stabilize the pressure difference before and after the flow adjustment device, so that the pressure before and after the valve After the difference is greater than the constant flow starting value, the flow through the valve will no longer change with the pressure difference before and after the valve, that is, within the range of pressure difference control, the flow through a certain opening of the valve can be kept constant automatically, and the flow rate The change can be realized only by adjusting the opening of the valve, which has nothing to do with the pressure difference between the front and back of the valve.

However, the constant flow valve of the related art has the following disadvantages. It cannot automatically adjust the opening of the valve according to the flow requirement, and cannot output real-time flow, and has no intelligent interface.

Aiming at the problem in the related art that it is difficult to adjust the valve opening according to the flow requirement, no effective solution has been proposed so far.

Contents of the invention

The present application provides a valve opening control method, device, non-volatile storage medium and processor to solve the problem in the related art that it is difficult to adjust the valve opening according to flow requirements.

According to one aspect of the present application, a method for controlling the opening of a valve is provided. The method includes: determining the corresponding target opening value of the valve under the current pressure difference based on the target flow value; adjusting the current opening value of the valve to the target opening value, and calculating the actual flow value of the fluid flowing through the valve; When the flow value is not equal to the target flow value, adjust the current opening value of the valve so that the difference between the actual flow value and the target flow value falls within the range of the preset flow value.

Optionally, determining the corresponding target opening value of the valve under the current pressure difference based on the target flow value includes: calculating the target parameter value of the fluid according to the target flow value and the pressure difference, wherein the target parameter value and the valve opening value have a mapping Relationship, the type of the target parameter value is one of the following: resistance number, flow coefficient; determine the target opening value according to the target parameter value and the mapping relationship.

Optionally, calculating the target parameter value of the fluid according to the target flow value and the pressure difference includes: calculating the resistance value of the fluid according to the target flow value and the pressure difference when the temperature change value of the fluid belongs to a preset temperature value range, and The resistance value is determined as the target parameter value; or the flow coefficient value of the fluid is calculated according to the target flow value, pressure difference and preset density, and the flow coefficient value is determined as the target parameter value; when the temperature change value of the fluid does not belong to the preset temperature value In the case of the range, the current density of the fluid is determined according to the current temperature of the fluid, the flow coefficient value of the fluid is calculated according to the target flow value, pressure difference and current density, and the flow coefficient value is determined as the target parameter value.

Optionally, before determining the target opening value according to the target parameter value and the mapping relationship, the method further includes: judging whether the target parameter value belongs to a preset range; when the target parameter value is greater than the maximum value corresponding to the preset range, or less than the minimum value corresponding to the preset range, an alarm message is issued; when the target parameter value belongs to the preset range, the step of determining the target opening value according to the target parameter value and the mapping relationship is performed.

Optionally, determining the target opening value according to the target parameter value and the mapping relationship includes: in the case that the mapping relationship is represented by a mapping table, matching the parameter value in the mapping table according to the target parameter value, and obtaining the matched parameter value corresponding to According to the valve opening corresponding to the matched parameter value, the target opening value is determined, wherein the mapping table contains the corresponding relationship between the parameter value and the valve opening; in the case where the mapping relationship is represented by a preset relationship Next, the valve opening corresponding to the target parameter value is determined based on the preset relational expression, and the valve opening corresponding to the target parameter value is determined as the target opening value. The corresponding relationship is determined.

Optionally, before determining the corresponding target opening value of the valve under the current pressure difference based on the target flow value, the method further includes: obtaining the current pressure difference of the valve, and judging whether the current pressure difference is greater than zero; when the current pressure difference is less than If it is equal to zero, determine that the current opening value of the valve is the maximum valve opening value, and issue an alarm message; when the current pressure difference is greater than zero, perform a determination based on the target flow value to determine the corresponding target opening value of the valve under the current pressure difference. degree value step.

Optionally, adjusting the current opening value of the valve to the target opening value, and calculating the actual flow value of the fluid passing through the valve includes: adjusting the current opening value of the valve to the target opening value, and obtaining the updated Current pressure difference; when the temperature change value of the fluid belongs to the preset temperature value range, calculate the actual flow value according to the target opening value and the updated current pressure difference, or calculate the actual flow value according to the target opening value and the updated current pressure difference and the preset density to calculate the actual flow value; when the temperature change value of the fluid does not belong to the range of the preset temperature value, the current density of the fluid is determined according to the current temperature of the fluid, and according to the target opening value and the updated current pressure difference And the current density calculates the actual flow value.

Optionally, when the actual flow value is not equal to the target flow value, adjusting the current opening value of the valve so that the difference between the actual flow value and the target flow value belongs to the preset flow value range includes: When the value is greater than the target flow value, reduce the target opening value so that the difference between the actual flow value and the target flow value belongs to the preset flow value range; when the actual flow value is smaller than the target flow value, increase The target opening value is large, so that the difference between the actual flow value and the target flow value belongs to the preset flow value range.

Optionally, the valve includes a valve body and a controller, and the controller includes a communication interface and/or a human-computer interaction module, wherein the communication interface is used to receive a target flow value or send a target signal value, and the human-computer interaction module is used to set the target flow value, and display the target flow value and/or display the target signal value, wherein the target signal value includes at least one of the following: current pressure difference, target opening value and actual flow value.

According to another aspect of the present application, a valve opening control device is provided. The device includes: a first determining unit, configured to determine the corresponding target opening value of the valve under the current pressure difference based on the target flow value; a calculating unit, configured to adjust the current opening value of the valve to the target opening value, and calculate The actual flow value of the fluid flowing through the valve; the adjustment unit is used to adjust the current opening value of the valve when the actual flow value is not equal to the target flow value, so that the difference between the actual flow value and the target flow value Belongs to the preset flow value range.

Optionally, the first determination unit includes: a first calculation module, configured to calculate the target parameter value of the fluid according to the target flow value and the pressure difference, wherein the target parameter value and the valve opening value have a mapping relationship, and the target parameter value The type is one of the following: resistance number, flow coefficient; a determination module is used to determine the target opening value according to the target parameter value and the mapping relationship.

Optionally, the first calculation module includes: a first calculation submodule, used to calculate the resistance value of the fluid according to the target flow value and the pressure difference when the temperature change value of the fluid belongs to the preset temperature value range, and calculate the resistance value The value is determined as the target parameter value; or the flow coefficient value of the fluid is calculated according to the target flow value, pressure difference and preset density, and the flow coefficient value is determined as the target parameter value; the second calculation sub-module is used to change the temperature of the fluid If the value does not belong to the preset temperature value range, determine the current density of the fluid according to the current temperature of the fluid, calculate the flow coefficient value of the fluid according to the target flow value, pressure difference and current density, and determine the flow coefficient value as the target parameter value .

Optionally, the determining module includes: a first determining submodule, configured to match the parameter values in the mapping table according to the target parameter values when the mapping relationship is represented by a mapping table, and obtain the valve corresponding to the matched parameter value Opening, determine the target opening value according to the valve opening corresponding to the matched parameter value, wherein the mapping table contains the corresponding relationship between the parameter value and the valve opening; In the case represented by the relational expression, the valve opening corresponding to the target parameter value is determined based on the preset relational expression, and the valve opening corresponding to the target parameter value is determined as the target opening value. The corresponding relationship between the parameter value and the valve opening is determined.

Optionally, the calculation unit includes: a first adjustment module, used to adjust the current opening value of the valve to a target opening value, and obtain an updated current pressure difference; When the value belongs to the preset temperature value range, the actual flow value is calculated according to the target opening value and the updated current pressure difference, or the actual flow value is calculated according to the target opening value, the updated current pressure difference and the preset density; The third calculation module is used to determine the current density of the fluid according to the current temperature of the fluid when the temperature change value of the fluid does not belong to the preset temperature value range, and determine the current density of the fluid according to the target opening value, the updated current pressure difference and the current Density calculates the actual flow value.

According to another aspect of the embodiments of the present invention, a non-volatile storage medium is also provided, and the non-volatile storage medium includes a stored program, wherein, when the program runs, the device where the non-volatile storage medium is located is controlled to execute a A method of controlling the valve opening.

According to another aspect of the embodiments of the present invention, there is also provided an electronic device, including a processor and a memory; computer-readable instructions are stored in the memory, and the processor is used to run the computer-readable instructions, wherein, when the computer-readable instructions run A control method for valve opening is implemented.

Through this application, the following steps are adopted: determine the corresponding target opening value of the valve under the current pressure difference based on the target flow value; adjust the current opening value of the valve to the target opening value, and calculate the actual flow rate of the fluid flowing through the valve value; when the actual flow value is not equal to the target flow value, adjust the current opening value of the valve so that the difference between the actual flow value and the target flow value belongs to the preset flow value range, which solves the difficulty in related technologies The problem of adjusting the opening of the valve according to the flow requirement. The current opening value of the valve is adjusted through the target flow value, so that the actual flow value approaches the target flow value, and then the effect of flexibly adjusting the valve opening according to the flow requirement is achieved.

Description of drawings

The drawings constituting a part of the application are used to provide further understanding of the application, and the schematic embodiments and descriptions of the application are used to explain the application, and do not constitute an improper limitation to the application. In the attached picture:

Fig. 1 is a flow chart of a method for controlling the opening of a valve according to an embodiment of the present application;

Fig. 2 is a schematic diagram of an optional valve provided according to an embodiment of the present application;

Fig. 3 is a schematic diagram of an optional valve provided according to an embodiment of the present application;

Fig. 4 is a flow chart of an optional valve opening control method provided according to an embodiment of the present application;

Fig. 5 is a flow chart of an optional valve opening control method provided according to an embodiment of the present application;

Fig. 6 is a schematic diagram of a valve opening control device provided according to an embodiment of the present application.

Detailed ways

It should be noted that, in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and embodiments.

In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiment of the application will be clearly and completely described below in conjunction with the accompanying drawings in the embodiment of the application. Obviously, the described embodiment is only It is an embodiment of a part of the application, but not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without creative efforts shall fall within the scope of protection of this application.

It should be noted that the terms "first" and "second" in the description and claims of the present application and the above drawings are used to distinguish similar objects, but not necessarily used to describe a specific sequence or sequence. It should be understood that the data so used may be interchanged under appropriate circumstances for the embodiments of the application described herein. Furthermore, the terms "comprising" and "having", as well as any variations thereof, are intended to cover a non-exclusive inclusion, for example, a process, method, system, product or device comprising a sequence of steps or elements is not necessarily limited to the expressly listed instead, may include other steps or elements not explicitly listed or inherent to the process, method, product or apparatus.

According to an embodiment of the present application, a method for controlling the opening of a valve is provided.

Fig. 1 is a flowchart of a method for controlling a valve opening according to an embodiment of the present application. As shown in Fig. 1, the method includes step S102, step S104 and step S106.

In step S102, the target opening value corresponding to the valve under the current pressure difference is determined based on the target flow value.

Specifically, the target flow value is set in advance and can meet the flow demand at the back end of the valve, the current pressure difference is the difference between the inlet pressure value and the outlet pressure value of the current valve, and the difference of the valve under the same flow rate Corresponding to different opening values under the pressure difference, determine the target opening value corresponding to the target flow value under the current pressure difference, thus laying the foundation for flow adjustment.

In order to ensure the normal operation of the valve and improve the accuracy of calculating the target opening value, optionally, in the method for controlling the valve opening provided in the embodiment of the present application, the corresponding pressure of the valve under the current pressure difference is determined based on the target flow value. Before the target opening value of the valve, the method also includes: obtaining the current pressure difference of the valve, and judging whether the current pressure difference is greater than zero; in the case that the current pressure difference is less than or equal to zero, determining that the current opening value of the valve is the maximum valve opening value, and send an alarm message; in the case that the current pressure difference is greater than zero, execute the step of determining the corresponding target opening value of the valve under the current pressure difference based on the target flow value.

In step S104, the current opening value of the valve is adjusted to the target opening value, and the actual flow value of the fluid passing through the valve is calculated.

Specifically, the current opening value of the valve is adjusted to the target opening value to realize the adjustment of the flow value, and the adjusted flow value is calculated in real time to obtain the actual flow value.

In step S106, if the actual flow value is not equal to the target flow value, the current opening value of the valve is adjusted so that the difference between the actual flow value and the target flow value falls within the preset flow value range.

Specifically, in the case that the actual flow value is equal to the target flow value, it means that the flow value of the fluid passing through the valve meets the flow demand, and the opening of the valve remains unchanged. The pressure difference constantly adjusts the current opening value of the valve, so that the actual flow value tends to be consistent with the target flow value, so that the fluid flowing through the valve meets the flow demand.

The valve opening control method provided in the embodiment of the present application determines the corresponding target opening value of the valve under the current pressure difference based on the target flow value; adjusts the current opening value of the valve to the target opening value, and calculates the flow through The actual flow value of the fluid of the valve; when the actual flow value is not equal to the target flow value, adjust the current opening value of the valve so that the difference between the actual flow value and the target flow value belongs to the preset flow value range, The problem in the related art that it is difficult to adjust the opening of the valve according to the flow requirement is solved. The current opening value of the valve is adjusted through the target flow value, so that the actual flow value approaches the target flow value, and then the effect of flexibly adjusting the valve opening according to the flow requirement is achieved.

Optionally, in the valve opening control method provided in the embodiment of the present application, determining the corresponding target opening value of the valve under the current pressure difference based on the target flow value includes: calculating the target parameter of the fluid according to the target flow value and the pressure difference Value, wherein, the target parameter value and the opening value of the valve have a mapping relationship, and the type of the target parameter value is one of the following: resistance number, flow coefficient; determine the target opening value according to the target parameter value and the mapping relationship.

It should be noted that the resistance number is the pressure loss that must be overcome when the fluid flows in the pipeline, and it is the characteristic coefficient of the pipeline resistance. The resistance value and the opening value of the valve have a mapping relationship, and the resistance value of the fluid can be obtained, so as to determine the target opening value according to the mapping relationship between the resistance value and the opening value.

The flow coefficient represents the flow capacity of the valve, which is defined as: when the regulating valve is fully opened, the pressure difference between the front and rear ends of the valve is 100KPa, and the fluid density is 1000Kg/m3 (that is, normal temperature water). Regulate the flow rate of the valve. The flow coefficient and the opening value of the valve have a mapping relationship, and the flow coefficient value of the fluid can be calculated, so as to determine the target opening value according to the mapping relationship between the flow coefficient value and the opening value.

Different fluids have different temperature characteristics. Optionally, in the valve opening control method provided in the embodiment of the present application, calculating the target parameter value of the fluid according to the target flow value and pressure difference includes: when the temperature change value of the fluid belongs to the preset In the case of temperature value range, calculate the resistance value of the fluid according to the target flow value and pressure difference, and determine the resistance value as the target parameter value; or calculate the flow coefficient value of the fluid according to the target flow value, pressure difference and preset density, and Determine the flow coefficient value as the target parameter value; when the temperature change value of the fluid does not belong to the preset temperature value range, determine the current density of the fluid according to the current temperature of the fluid, and calculate the fluid density according to the target flow value, pressure difference and current density The flow coefficient value of , and determine the flow coefficient value as the target parameter value.

Specifically, the relationship between the resistance number S, the flow rate Q, and the pressure difference ΔP can be expressed by formula 1: ΔP=S*Q ² . The relationship between the flow coefficient KV, the flow rate Q, and the pressure difference ΔP can be expressed by formula 2: ΔP=ρ/KV*Q ² , where ρ is the density of the fluid.

Therefore, for fluids with little temperature change, such as chilled water in air conditioners, the density can be considered as a constant. Given the target flow value and preset density, and the current pressure difference is known, the resistance value can be obtained by formula 1, or by Formula 2 calculates the discharge coefficient value, and determines the resistance value or discharge coefficient value as the target parameter.

It should be noted that the flow coefficient KV is a constant related to the geometric structure of the valve and a given stroke. It can be seen from the formula 1 and the formula that S=ρ/KV, for the fluid with little temperature change, since the density can be considered as a constant, so the resistance number can also be considered as a constant, but for the fluid with large temperature change, the density is a variable, you can first determine the corresponding density under the current temperature value of the fluid according to the temperature density table, as shown in Table 1, and then calculate the flow coefficient value according to formula 2, determine the flow coefficient value as the target parameter, and finally according to the target parameter Determine the valve opening, the obtained valve opening is more accurate, and can adapt to fluids with different temperature characteristics.

Table 1

temperature T	Fluid density ρ
...	...
...	...
the	the
the	the
...	...

The preset range is the range in which the target parameter value falls when the valve is working normally. Optionally, in the valve opening control method provided in the embodiment of the present application, the target opening is determined according to the target parameter value and the mapping relationship Before the value, the method also includes: judging whether the target parameter value belongs to the preset range; when the target parameter value is greater than the maximum value corresponding to the preset range, or less than the minimum value corresponding to the preset range, sending a warning message ; When the target parameter value belongs to the preset range, execute the step of determining the target opening value according to the target parameter value and the mapping relationship.

It should be noted that, when the type of the target parameter is different, the determination method of the maximum value and minimum value corresponding to the preset range is also different. Specifically, when the type of the target parameter value is flow coefficient, the maximum value corresponding to the preset range The value can be the target parameter value corresponding to the maximum valve opening, and the minimum value corresponding to the preset range can be the target parameter value corresponding to the minimum valve opening; when the type of the target parameter value is resistance number, the maximum value corresponding to the preset range It may be the target parameter value corresponding to the minimum valve opening, and the minimum value corresponding to the preset range may be the target parameter value corresponding to the maximum valve opening. Therefore, when the target parameter value is greater than the maximum value corresponding to the preset range, it indicates that the valve opening is greater than the maximum opening, and an alarm message is issued; when the target parameter value is less than the minimum value corresponding to the preset range, it indicates that the valve opening If it is less than the minimum opening, an alarm message will be issued; and if the target parameter value is within the preset range, it means that the valve is working normally, and the target opening value is determined.

Optionally, in the valve opening control method provided in the embodiment of the present application, determining the target opening value according to the target parameter value and the mapping relationship includes: when the mapping relationship is represented by a mapping table, matching according to the target parameter value The parameter value in the mapping table, and obtain the valve opening corresponding to the matched parameter value, and determine the target opening value according to the valve opening corresponding to the matching parameter value, wherein, the mapping table contains the relationship between the parameter value and the valve opening Correspondence; in the case that the mapping relationship is represented by a preset relational expression, the valve opening corresponding to the target parameter value is determined based on the preset relational expression, and the valve opening corresponding to the target parameter value is determined as the target opening value, where , the preset relationship is determined by the corresponding relationship between the parameter value and the valve opening in the mapping table.

In an optional embodiment, the mapping relationship is represented by a mapping table, as shown in Table 2, the mapping table lists the opening degree of the valve and the resistance number, or the one-to-one correspondence between the opening degree of the valve and the flow coefficient relationship, the mapping table can be given by the valve manufacturer, or it can be measured during the application of the valve.

Table 2

Valve opening %	Resistance number S 3	Flow coefficient KV
1	...	...
2	...	...
3	the	the
...	the	the
100	...	...

Specifically, after obtaining the resistance value or flow coefficient value, the parameters can be matched in Table 2 to obtain one or two matched parameters. Optionally, in the case of obtaining a matched parameter, the approximate The opening degree of the valve can be determined by the method, and the opening degree of the valve can be determined according to the interpolation method when the two matching parameters are obtained.

In another optional embodiment, the mapping relationship is represented by a preset relational expression. Specifically, since there is a one-to-one correspondence between the opening degree of the valve and the resistance value, the opening degree and the flow coefficient, regression analysis can be adopted method to find out the correlation between the opening degree and the resistance number, thereby obtaining the first preset relational expression reflecting the correlation, and adopting the regression analysis method to find out the correlation between the opening degree and the flow coefficient, thus obtaining the correlation expression reflecting the correlation A second preset relational expression is used, and the valve opening is further calculated based on the first preset relational expression or the second preset relational expression.

Different fluids have different temperature characteristics. Optionally, in the valve opening control method provided in the embodiment of the present application, optionally, the current opening value of the valve is adjusted to the target opening value, and the flow through the valve is calculated. The actual flow value of the fluid includes: adjusting the current opening value of the valve to the target opening value, and obtaining the updated current pressure difference; when the temperature change value of the fluid belongs to the preset temperature value range, according to the target opening value value, the updated current pressure difference to calculate the actual flow value, or calculate the actual flow value based on the target opening value, the updated current pressure difference and the preset density; when the temperature change value of the fluid does not belong to the preset temperature value range Next, the current density of the fluid is determined according to the current temperature of the fluid, and the actual flow value is calculated according to the target opening value, the updated current pressure difference and the current density.

Specifically, search in Table 2 to obtain the resistance number or flow coefficient corresponding to the target opening value. The relationship between the resistance number S, the flow rate Q, and the pressure difference ΔP can be represented by formula 1: ΔP=S*Q ² . The relationship between the flow coefficient KV, the flow rate Q, and the pressure difference ΔP can be expressed by formula 2: ΔP=ρ/KV*Q ² , where ρ is the density of the fluid.

Therefore, for a fluid with little temperature change, the actual flow value can be obtained by formula 1 given the resistance number and the updated pressure difference; the given resistance number, the updated pressure difference and the preset density can be calculated by formula 2 Find the actual flow value.

For fluids with large temperature changes, the density is a variable. As shown in Table 1, the density corresponding to the current temperature value of the fluid can be determined according to the temperature density table, given the resistance number, the updated pressure difference and the current density, Then calculate the actual flow value according to formula two.

In order to make the flow value of the fluid passing through the valve meet the flow demand, optionally, in the valve opening control method provided in the embodiment of the present application, when the actual flow value is not equal to the target flow value, the current flow of the valve is adjusted. The opening value so that the difference between the actual flow value and the target flow value belongs to the preset flow value range includes: when the actual flow value is greater than the target flow value, reduce the target opening value so that the actual flow value The difference between the target flow value and the target flow value belongs to the preset flow value range; when the actual flow value is less than the target flow value, increase the target opening value so that the difference between the actual flow value and the target flow value belongs to Preset flow value range.

Specifically, when the actual flow value is not equal to the target flow value, the current opening value of the valve is continuously adjusted so that the actual flow value approaches the target flow value, so that the fluid flow value meets the flow demand.

Optionally, in the valve opening control method provided in the embodiment of the present application, the valve includes a valve body and a controller, and the controller includes a communication interface and/or a human-computer interaction module, wherein the communication interface is used to receive the target flow value Or send the target signal value, the human-computer interaction module is used to set the target flow value, and display the target flow value and/or display the target signal value, wherein the target signal value includes at least one of the following: current pressure difference, target opening value and Actual flow value.

Specifically, the communication interface can be a 485 communication interface, which can input signals, such as target flow rate, and output signals, such as valve inlet and outlet pressure, opening degree, flow rate, etc. The human-computer interaction module can include a display screen and operation buttons, which can set or modify parameters, such as the target flow rate, and can also display various information, such as the inlet and outlet pressure, opening degree, and flow rate of the valve.

In an optional implementation, as shown in Figure 2, it is a schematic diagram of an optional valve provided in the embodiment of the present application. For a fluid with little temperature change, the controller can obtain the inlet pressure value and outlet pressure of the valve. Value, and obtain the target flow value determined by the communication interface or human-computer interaction module, so as to calculate the target signal value and control the valve opening according to the obtained parameters.

In an optional implementation, as shown in Figure 3, it is a schematic diagram of an optional valve provided in the embodiment of the present application. For fluids with large temperature changes, the controller can obtain the inlet pressure value and outlet pressure of the valve. value and the current temperature value of the fluid, and obtain the target flow value determined by the communication interface or human-computer interaction module, so as to calculate the target signal value and control the valve opening according to the obtained parameters.

Through this embodiment, the flow dynamic parameters can be input through the communication interface, and the opening of the valve can be automatically adjusted according to the pressure difference between the inlet and outlet of the valve, so as to realize precise flow control. The flow parameters are input through the communication interface and the human-computer interaction module, and the valve opening is automatically adjusted according to the pressure difference between the inlet and outlet of the valve to realize digital constant flow regulation. According to the pressure difference between the inlet and outlet of the valve, the real-time flow value can be calculated and output through the intelligent interface and man-machine interface to realize the function of a digital flowmeter with output.

Fig. 4 is a flow chart of an optional valve opening control method according to an embodiment of the present application. As shown in Figure 4, the method includes:

Obtain the preset flow rate Q, read the valve inlet pressure P1, valve outlet pressure P2 and fluid temperature T collected by the sensor, and calculate the real-time pressure difference ΔP=P1-P2. Judging whether ΔP is greater than 0, if not, it indicates that the valve is at the maximum opening and an alarm is given, if yes, check the temperature density table according to the temperature T to get ρ or input ρ, and the flow coefficient KV=Q ² / ΔP*ρ.

Further, it is judged whether KV is greater than the value corresponding to the maximum opening of the valve, and whether it is smaller than the value corresponding to the minimum opening of the valve. If it is greater than the value corresponding to the maximum opening of the valve, it means that the valve is at the maximum opening and an alarm is issued. In the case of conformity, check the table corresponding to the valve opening and KV to determine the water valve opening X, or use the calculation formula to find the water valve opening X, and control the valve to execute according to the opening X.

Further, according to the current valve opening X, valve inlet pressure P1, valve outlet pressure P2 and fluid temperature T, calculate whether the actual flow Q* is equal to Q, if it is equal, keep the valve opening, if it is greater than , properly reduce the valve opening, and further calculate the actual flow Q*, until the actual flow Q* is equal to Q, in the case of less than, appropriately increase the valve opening, and further calculate the actual flow Q*, until the actual flow Q* equal to Q.

Fig. 5 is a flowchart of an optional valve opening control method according to an embodiment of the present application. As shown in Figure 5, the method includes:

Obtain the preset flow rate Q, read the valve inlet pressure P1, valve outlet pressure P2 and fluid temperature T collected by the sensor, and calculate the real-time pressure difference ΔP=P1-P2. Judging whether ΔP is greater than 0, if not, it indicates that the valve is at the maximum opening and an alarm is issued, and if yes, calculate the resistance value of the valve S=ΔP/Q ² .

Further, it is judged whether S is less than the value corresponding to the maximum opening of the valve, and whether it is greater than the value corresponding to the minimum opening of the valve. If it is greater than the value corresponding to the minimum opening of the valve, it means that the valve is at the maximum opening and an alarm is issued; if it is in compliance, check the valve opening and the table corresponding to S to determine the valve opening X, or Use the calculation formula to find the opening degree X of the water valve, and control the valve to execute according to the opening degree X.

Further, according to the current valve opening X, valve inlet pressure P1, valve outlet pressure P2 and fluid temperature T, calculate whether the actual flow Q* is equal to Q, if it is equal, keep the valve opening, if it is greater than , properly reduce the valve opening, and further calculate the actual flow Q*, until the actual flow Q* is equal to Q, in the case of less than, appropriately increase the valve opening, and further calculate the actual flow Q*, until the actual flow Q* equal to Q.

Through the embodiment of this application, the resistance number or flow coefficient of the valve is calculated according to the valve pressure difference and the set flow value, and the valve opening is calculated according to the resistance number or flow coefficient, and when the flow value is not equal to the set flow value Under this condition, the opening of the valve is constantly adjusted, and the purpose of accurate flow regulation through the valve is realized.

It should be noted that the steps shown in the flowcharts of the accompanying drawings may be performed in a computer system, such as a set of computer-executable instructions, and that although a logical order is shown in the flowcharts, in some cases, The steps shown or described may be performed in an order different than here.

The embodiment of the present application also provides a valve opening control device. It should be noted that the valve opening control device in the embodiment of the present application can be used to implement the valve opening control provided in the embodiment of the present application. method. The device for controlling the valve opening provided by the embodiment of the present application is introduced below.

Fig. 6 is a schematic diagram of a valve opening control device according to an embodiment of the present application. As shown in FIG. 6 , the device includes: a first determination unit 10 , a calculation unit 20 and an adjustment unit 30 .

Specifically, the first determining unit 10 is configured to determine a corresponding target opening value of the valve under the current pressure difference based on the target flow value.

The calculation unit 20 is used to adjust the current opening value of the valve to a target opening value, and calculate the actual flow value of the fluid passing through the valve.

The adjustment unit 30 is used to adjust the current opening value of the valve when the actual flow value is not equal to the target flow value, so that the difference between the actual flow value and the target flow value falls within the preset flow value range.

The valve opening control device provided in the embodiment of the present application uses the first determination unit 10 to determine the corresponding target opening value of the valve under the current pressure difference based on the target flow value; the calculation unit 20 adjusts the current opening value of the valve to the target opening value, and calculate the actual flow value of the fluid flowing through the valve; when the actual flow value is not equal to the target flow value, the adjustment unit 30 adjusts the current opening value of the valve so that the difference between the actual flow value and the target flow value The difference between them belongs to the preset flow value range, which solves the problem that it is difficult to adjust the valve opening according to the flow requirement in the related technology. The current opening value of the valve is adjusted through the target flow value so that the actual flow value approaches the target flow value. Furthermore, the effect of flexibly adjusting the opening of the valve according to the flow requirement is achieved.

Optionally, in the valve opening control device provided in the embodiment of the present application, the first determination unit 10 includes: a first calculation module, which is used to calculate the target parameter value of the fluid according to the target flow value and the pressure difference, wherein the target The parameter value and the opening value of the valve have a mapping relationship, and the type of the target parameter value is one of the following: resistance number, flow coefficient; a determination module is used to determine the target opening value according to the target parameter value and the mapping relationship.

Optionally, in the valve opening control device provided in the embodiment of the present application, the first calculation module includes: a first calculation sub-module, configured to calculate the temperature change value of the fluid according to the preset temperature value range Calculate the resistance value of the fluid with the target flow value and pressure difference, and determine the resistance value as the target parameter value; or calculate the flow coefficient value of the fluid according to the target flow value, pressure difference and preset density, and determine the flow coefficient value as the target parameter value; the second calculation submodule is used to determine the current density of the fluid according to the current temperature of the fluid when the temperature change value of the fluid does not belong to the preset temperature value range, and calculate the fluid according to the target flow value, pressure difference and current density The flow coefficient value of , and determine the flow coefficient value as the target parameter value.

Optionally, in the valve opening control device provided in the embodiment of the present application, the device further includes: a judging module, used to judge whether the target parameter value belongs to The preset range; the alarm module is used to send an alarm message when the target parameter value is greater than the maximum value corresponding to the preset range, or is smaller than the minimum value corresponding to the preset range; the execution module is used to set the target parameter value If the value belongs to the preset range, the step of determining the target opening value according to the target parameter value and the mapping relationship is performed.

Optionally, in the valve opening control device provided in the embodiment of the present application, the determining module includes: a first determining submodule, configured to match the mapping table according to the target parameter value when the mapping relationship is represented by a mapping table The parameter value in , and obtain the valve opening corresponding to the matched parameter value, and determine the target opening value according to the valve opening corresponding to the matched parameter value, where the mapping table contains the corresponding relationship between the parameter value and the valve opening ; The second determination sub-module is used to determine the valve opening corresponding to the target parameter value based on the preset relationship when the mapping relationship is represented by a preset relationship, and determine the valve opening corresponding to the target parameter value as The target opening value, wherein the preset relationship is determined by the corresponding relationship between the parameter value and the valve opening in the mapping table.

Optionally, in the valve opening control device provided in the embodiment of the present application, the device further includes: an acquisition unit, used to acquire The current pressure difference of the valve, and judge whether the current pressure difference is greater than zero; the second determination unit is used to determine the current opening value of the valve as the maximum valve opening value when the current pressure difference is less than or equal to zero, and send an alarm message ; The execution unit is used to execute the step of determining the corresponding target opening value of the valve under the current pressure difference based on the target flow value when the current pressure difference is greater than zero.

Optionally, in the valve opening control device provided in the embodiment of the present application, the calculation unit 20 includes: a first adjustment module, configured to adjust the current opening value of the valve to the target opening value, and obtain the updated The current pressure difference; the second calculation module, used to calculate the actual flow value according to the target opening value and the updated current pressure difference when the temperature change value of the fluid belongs to the preset temperature value range, or according to the target opening value , the updated current pressure difference and the preset density to calculate the actual flow value; the third calculation module is used to determine the current density of the fluid according to the current temperature of the fluid when the temperature change value of the fluid does not belong to the range of the preset temperature value , and calculate the actual flow value according to the target opening value, the updated current pressure difference and the current density.

Optionally, in the valve opening control device provided in the embodiment of the present application, the adjustment unit 30 includes: a second adjustment module, configured to reduce the target opening value when the actual flow value is greater than the target flow value, so that the difference between the actual flow value and the target flow value belongs to the preset flow value range; the third adjustment module is used to increase the target opening value when the actual flow value is less than the target flow value, so that the actual The difference between the flow value and the target flow value belongs to the preset flow value range.

Optionally, in the valve opening control device provided in the embodiment of the present application, the valve includes a valve body and a controller, and the controller includes a communication interface and/or a human-computer interaction module, wherein the communication interface is used to receive the target flow value Or send the target signal value, the human-computer interaction module is used to set the target flow value, and display the target flow value and/or display the target signal value, wherein the target signal value includes at least one of the following: current pressure difference, target opening value and Actual flow value.

The control device of the valve opening includes a processor and a memory, and the above-mentioned first determination unit 10, the calculation unit 20 and the adjustment unit 30, etc. are all stored in the memory as program units, and the above-mentioned program units stored in the memory are executed by the processor to achieve the corresponding functions.

The processor includes a kernel, and the kernel fetches corresponding program units from the memory. One or more kernels can be set, and the problem that it is difficult to adjust the valve opening according to flow requirements in related technologies can be solved by adjusting kernel parameters.

Memory may include non-permanent memory in computer-readable media, in the form of random access memory (RAM) and/or non-volatile memory, such as read-only memory (ROM) or flash memory (flash RAM), memory including at least one memory chip.

The embodiment of the present application also provides a non-volatile storage medium, the non-volatile storage medium includes a stored program, wherein, when the program is running, the device where the non-volatile storage medium is located is controlled to perform a valve opening control method.

The embodiment of the present application also provides an electronic device, including a processor and a memory; computer-readable instructions are stored in the memory, and the processor is used to run the computer-readable instructions, wherein, when the computer-readable instructions are running, a valve opening degree control method. The electronic device herein may be a server, a PC, a PAD, a mobile phone, and the like.

Those skilled in the art should understand that the embodiments of the present application may be provided as methods, systems, or computer program products. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present application may 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.) having computer-usable program code embodied therein.

The present application is described with reference to flowcharts and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the present application. It should be understood that each process and/or block in the flowchart and/or block diagrams, and a combination of processes and/or blocks in the flowchart and/or block diagrams can be realized by computer program instructions. These computer program instructions may be provided to a general purpose computer, special purpose computer, embedded processor, or processor of other programmable data processing equipment to produce a machine such that the instructions executed by the processor of the computer or other programmable data processing equipment produce a An apparatus for realizing the functions specified in one or more procedures of the flowchart and/or one or more blocks of the block diagram.

These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing apparatus to operate in a specific manner, such that the instructions stored in the computer-readable memory produce an article of manufacture comprising instruction means, the instructions The device realizes the function specified in one or more procedures of the flowchart and/or one or more blocks of the block diagram.

These computer program instructions can also be loaded onto a computer or other programmable data processing device, causing a series of operational steps to be performed on the computer or other programmable device to produce a computer-implemented process, thereby The instructions provide steps for implementing the functions specified in the flow chart or blocks of the flowchart and/or the block or blocks of the block diagrams.

In a typical configuration, a computing device includes one or more processors (CPUs), input/output interfaces, network interfaces, and memory.

Memory may include non-permanent storage in computer readable media, in the form of random access memory (RAM) and/or nonvolatile memory such as read only memory (ROM) or flash RAM. The memory is an example of a computer readable medium.

Computer-readable media, including both permanent and non-permanent, removable and non-removable media, can be implemented by any method or technology for storage of information. Information may be computer readable instructions, data structures, modules of a program, or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read only memory (ROM), Electrically Erasable Programmable Read-Only Memory (EEPROM), Flash memory or other memory technology, Compact Disc Read-Only Memory (CD-ROM), Digital Versatile Disc (DVD) or other optical storage, Magnetic tape cartridge, tape magnetic disk storage or other magnetic storage device or any other non-transmission medium that can be used to store information that can be accessed by a computing device. As defined herein, computer-readable media excludes transitory computer-readable media, such as modulated data signals and carrier waves.

It should also be noted that the term "comprises", "comprises" or any other variation thereof is intended to cover a non-exclusive inclusion such that a process, method, article, or apparatus comprising a set of elements includes not only those elements, but also includes Other elements not expressly listed, or elements inherent in the process, method, commodity, or apparatus are also included. Without further limitations, an element defined by the phrase "comprising a ..." does not preclude the presence of additional identical elements in the process, method, article, or apparatus that includes the element.

The above are only examples of the present application, and are not intended to limit the present application. For those skilled in the art, various modifications and changes may occur in this application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included within the scope of the claims of the present application.

Claims (16)

1. A method for controlling the opening of a valve, comprising:

   Based on the target flow value, determine the corresponding target opening value of the valve under the current pressure difference;

   adjusting the current opening value of the valve to the target opening value, and calculating the actual flow value of the fluid passing through the valve;

   When the actual flow value is not equal to the target flow value, adjust the current opening value of the valve so that the difference between the actual flow value and the target flow value belongs to the preset flow value scope.
2. The method according to claim 1, wherein the determining the corresponding target opening value of the valve under the current pressure difference based on the target flow value comprises:

   Calculate the target parameter value of the fluid according to the target flow value and the pressure difference, wherein the target parameter value and the opening value of the valve have a mapping relationship, and the type of the target parameter value is one of the following : resistance number, flow coefficient;

   The target opening value is determined according to the target parameter value and the mapping relationship.
3. The method according to claim 2, wherein the calculating the target parameter value of the fluid according to the target flow value and the pressure difference comprises:

   When the temperature change value of the fluid belongs to the preset temperature value range, calculate the resistance value of the fluid according to the target flow value and the pressure difference, and determine the resistance value as the target parameter value ; or calculate the flow coefficient value of the fluid according to the target flow value, the pressure difference and the preset density, and determine the flow coefficient value as the target parameter value;

   If the temperature change value of the fluid does not belong to the preset temperature value range, determine the current density of the fluid according to the current temperature of the fluid, and determine the current density of the fluid according to the target flow value, the pressure difference and the The current density calculates a discharge coefficient value of the fluid, and determines the discharge coefficient value as the target parameter value.
4. The method according to claim 2, wherein, before determining the target opening value according to the target parameter value and the mapping relationship, the method further comprises:

   judging whether the target parameter value belongs to a preset range;

   When the target parameter value is greater than the maximum value corresponding to the preset range, or less than the minimum value corresponding to the preset range, send a warning message;

   If the target parameter value belongs to the preset range, the step of determining the target opening value according to the target parameter value and the mapping relationship is performed.
5. The method according to claim 2, wherein the determining the target opening value according to the target parameter value and the mapping relationship comprises:

   In the case that the mapping relationship is represented by a mapping table, match the parameter values in the mapping table according to the target parameter value, and obtain the valve opening corresponding to the matched parameter value, according to the matched parameter value The valve opening corresponding to the value determines the target opening value, wherein the mapping table contains the corresponding relationship between the parameter value and the valve opening;

   In the case that the mapping relationship is represented by a preset relational expression, the valve opening corresponding to the target parameter value is determined based on the preset relational expression, and the valve opening corresponding to the target parameter value is determined as the The target opening value, wherein the preset relational expression is determined by the corresponding relationship between the parameter value and the valve opening in the mapping table.
6. The method according to claim 1, characterized in that, before determining the target opening value corresponding to the valve under the current pressure difference based on the target flow value, the method further comprises:

   Obtaining the current pressure difference of the valve, and judging whether the current pressure difference is greater than zero;

   In the case that the current pressure difference is less than or equal to zero, determine that the current opening value of the valve is a maximum valve opening value, and issue an alarm message;

   In the case that the current pressure difference is greater than zero, the step of determining the corresponding target opening value of the valve under the current pressure difference based on the target flow value is executed.
7. The method according to claim 1, wherein the adjusting the current opening value of the valve to the target opening value and calculating the actual flow value of the fluid passing through the valve comprises:

   adjusting the current opening value of the valve to the target opening value, and obtaining an updated current pressure difference;

   When the temperature change value of the fluid belongs to the preset temperature value range, the actual flow value is calculated according to the target opening value and the updated current pressure difference, or according to the target opening value, The updated current pressure difference and preset density calculate the actual flow value;

   If the temperature change value of the fluid does not belong to the preset temperature value range, determine the current density of the fluid according to the current temperature of the fluid, and determine the current density of the fluid according to the target opening value, the updated The current pressure difference and the current density calculate the actual flow value.
8. The method according to claim 1, wherein when the actual flow value is not equal to the target flow value, adjusting the current opening value of the valve so that the actual flow value is equal to the target flow value The difference between the target flow values belongs to the range of preset flow values including:

   When the actual flow value is greater than the target flow value, reduce the target opening value so that the difference between the actual flow value and the target flow value belongs to the preset flow value scope;

   When the actual flow value is less than the target flow value, increasing the target opening value so that the difference between the actual flow value and the target flow value belongs to the preset flow value scope.
9. The method according to claim 1, wherein the valve includes a valve body and a controller, and the controller includes a communication interface and/or a human-computer interaction module, wherein the communication interface is used to receive the target Flow value or send target signal value, the human-computer interaction module is used to set the target flow value, and display the target flow value and/or display the target signal value, wherein the target signal value at least includes the following One: the current pressure difference, the target opening value and the actual flow value.
10. A valve opening control device, characterized in that it comprises:

    The first determination unit is configured to determine the corresponding target opening value of the valve under the current pressure difference based on the target flow value;

    a calculation unit, configured to adjust the current opening value of the valve to the target opening value, and calculate the actual flow value of the fluid passing through the valve;

    An adjusting unit, configured to adjust the current opening value of the valve when the actual flow value is not equal to the target flow value, so that the difference between the actual flow value and the target flow value Belongs to the preset flow value range.
11. The device according to claim 10, wherein the first determining unit comprises:

    The first calculation module is used to calculate the target parameter value of the fluid according to the target flow value and the pressure difference, wherein the target parameter value and the opening value of the valve have a mapping relationship, and the target parameter value The type of value is one of: resistance number, flow coefficient;

    A determining module, configured to determine the target opening value according to the target parameter value and the mapping relationship.
12. The device according to claim 11, wherein the first calculation module comprises:

    The first calculation sub-module is used to calculate the resistance value of the fluid according to the target flow value and the pressure difference when the temperature change value of the fluid belongs to the preset temperature value range, and calculate the resistance value The value is determined as the target parameter value; or the flow coefficient value of the fluid is calculated according to the target flow value, the pressure difference and the preset density, and the flow coefficient value is determined as the target parameter value;

    The second calculation submodule is used to determine the current density of the fluid according to the current temperature of the fluid when the temperature change value of the fluid does not belong to the preset temperature value range, and determine the current density of the fluid according to the target flow value , the pressure difference, and the current density to calculate a flow coefficient value of the fluid, and determine the flow coefficient value as the target parameter value.
13. The device according to claim 11, wherein the determining module comprises:

    The first determination submodule is configured to match the parameter values in the mapping table according to the target parameter value when the mapping relationship is represented by a mapping table, and obtain the valve opening corresponding to the matched parameter value , determining the target opening value according to the valve opening corresponding to the matched parameter value, wherein the mapping table includes a corresponding relationship between the parameter value and the valve opening;

    The second determination sub-module is used to determine the valve opening corresponding to the target parameter value based on the preset relationship when the mapping relationship is represented by a preset relationship, and set the target parameter value The corresponding valve opening is determined as the target opening value, wherein the preset relationship is determined by the corresponding relationship between the parameter value and the valve opening in the mapping table.
14. The device according to claim 10, wherein the computing unit comprises:

    A first adjustment module, configured to adjust the current opening value of the valve to the target opening value, and obtain an updated current pressure difference;

    The second calculation module is used to calculate the actual flow value according to the target opening value and the updated current pressure difference when the temperature change value of the fluid belongs to the preset temperature value range, or according to the The actual flow value is calculated from the target opening value, the updated current pressure difference and the preset density;

    The third calculation module is used to determine the current density of the fluid according to the current temperature of the fluid when the temperature change value of the fluid does not belong to the preset temperature value range, and determine the current density of the fluid according to the target opening degree value, the updated current differential pressure, and the current density to calculate the actual flow value.
15. A non-volatile storage medium, characterized in that the non-volatile storage medium includes a stored program, wherein, when the program runs, the device where the non-volatile storage medium is located is controlled to execute claims 1 to 9 The control method of the valve opening described in any one.
16. An electronic device, characterized in that it includes a processor and a memory, the memory stores computer-readable instructions, and the processor is used to execute the computer-readable instructions, wherein the computer-readable instructions are executed when running The method for controlling the valve opening according to any one of claims 1-9.

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