Pressure balance control method, device and system for compressed air foam system

Abstract

The invention provides a pressure balance control method, device and system for a compressed air foam system. The method comprises the steps that the outlet air pressure of a compressed air system in the compressed air foam system and the outlet water pressure of a fire pump are obtained; and under the condition that the outlet air pressure and the outlet water pressure do not meet the pressure balance condition, an electromagnetic proportional valve is called to adjust the opening degree of an air inlet valve in the compressed air system according to the outlet air pressure and the outlet water pressure till the outlet air pressure and the outlet water pressure meet the pressure balance condition. The electromagnetic proportional valve is adopted to replace a traditional backpressure regulating valve, the opening degree of the air inlet valve can be accurately controlled through the electronic speed controller, and the defects that the water storage position of the traditional backpressure regulating valve is prone to freezing, the number of connecting pipelines is large, the pipelines are complex, regular replacement is needed, and the response to pressure changes is slow are effectively overcome.

Description

Technical Field

[0001] The present invention relates to the technical fields of fire-fighting equipment and control technology, and particularly relates to a pressure balance control method, device and system for a compressed air foam system. Background Art

[0002] A compressed air foam system (CAFS), that is, a compressed air foam fire extinguishing system, when working, water first mixes with foam to form a mixture, and then the mixture mixes with compressed air. The pressure of the mixture comes from a fire pump, and the pressure of the air comes from a compressed air system. When the two are mixed, they need to maintain similar pressures.

[0003] In the prior art, a back pressure regulating valve is usually used to regulate the pressure of the mixture and the pressure of the air in the CAFS system.

[0004] However, in cold seasons, the water storage part under the diaphragm of the back pressure regulating valve is prone to freeze quickly, resulting in the failure of the regulating ability; the diaphragm of the back pressure regulating valve is usually made of rubber material, and repeated movement will cause the rubber to age and crack, and it needs to be replaced regularly; the pressure of the mixture, that is, the outlet pressure of the fire pump, is affected by the change in the number of water guns, the change in the conveying height and distance, and it is difficult to remain fixed. The pressure of the air, due to depending on the mechanical movement of the back pressure regulating valve to regulate, has a relatively slow response speed to pressure changes. Therefore, an effective solution is urgently needed to solve the above problems. Summary of the Invention

[0005] To solve the above problems, the present invention provides a pressure balance control method, device and system for a compressed air foam system.

[0006] The present invention provides a pressure balance control method for a compressed air foam system, including: Obtaining the outlet air pressure of the compressed air system and the outlet water pressure of the fire pump in the compressed air foam system; In the case that the outlet air pressure and the outlet water pressure do not meet the pressure balance condition, according to the outlet air pressure and the outlet water pressure, calling an electromagnetic proportional valve to adjust the opening degree of the inlet valve in the compressed air system until the outlet air pressure and the outlet water pressure meet the pressure balance condition.

[0007] According to a pressure balance control method for a compressed air foam system provided by the present invention, the pressure balance condition is that the outlet air pressure is greater than or equal to a first pressure threshold, and the outlet air pressure is less than or equal to a second pressure threshold. The first pressure threshold is the product of the outlet water pressure and a first set value, the second pressure threshold is the product of the outlet water pressure and a second set value, and the first set value is less than the second set value.

[0008] A pressure balance control method for a compressed air foam system provided by the present invention, which calls an electromagnetic proportional valve to adjust the opening degree of an intake valve in the compressed air system according to the outlet air pressure and the outlet water pressure, includes: Processing the outlet air pressure and the outlet water pressure by using a proportional integral derivative algorithm to obtain a target opening degree corresponding to the intake valve in the compressed air system; Calling the electromagnetic proportional valve to adjust and adjusting the opening degree of the intake valve in the compressed air system to the target opening degree.

[0009] A pressure balance control method for a compressed air foam system provided by the present invention, which processes the outlet air pressure and the outlet water pressure by using a proportional integral derivative algorithm to obtain a target opening degree corresponding to the intake valve in the compressed air system, includes: Obtaining a target difference between the outlet air pressure and the outlet water pressure, and calculating an actual difference between the outlet air pressure and the outlet water pressure; Calculating a deviation between the target difference and the actual difference; Using a proportional integral derivative algorithm to perform proportional integral derivative adjustment on the deviation to obtain a target opening degree corresponding to the intake valve in the compressed air system.

[0010] A pressure balance control method for a compressed air foam system provided by the present invention, which calls the electromagnetic proportional valve to adjust and adjusts the opening degree of the intake valve in the compressed air system to the target opening degree, includes: In the case where the outlet air pressure is less than the first pressure threshold, calling the electromagnetic proportional valve to adjust and increasing the opening degree of the intake valve in the compressed air system to the target opening degree; In the case where the outlet air pressure is greater than the second pressure threshold, calling the electromagnetic proportional valve to adjust and decreasing the opening degree of the intake valve in the compressed air system to the target opening degree.

[0011] For a pressure balance control method for a compressed air foam system provided by the present invention, the pulse width modulation frequency of the electromagnetic proportional valve is greater than 1000 Hz, the repeat accuracy is less than or equal to 1%, the sensitivity is less than or equal to 0.1%, and the maximum pressure is 1.0 MPa.

[0012] The present invention also provides a pressure balance control device for a compressed air foam system, including: An acquisition module configured to acquire the outlet air pressure of the compressed air system and the outlet water pressure of the fire pump in the compressed air foam system; An adjustment module, configured to, when the outlet air pressure and the outlet water pressure do not satisfy the pressure balance condition, according to the outlet air pressure and the outlet water pressure, call an electromagnetic proportional valve to adjust the opening degree of the intake valve in the compressed air system until the outlet air pressure and the outlet water pressure satisfy the pressure balance condition.

[0013] The present invention also provides a compressed air foam system, including: A compressed air system, a fire pump, a pressure sensor, a controller, and an electromagnetic proportional valve, wherein the compressed air system includes an intake valve; The pressure sensor is used to obtain the outlet air pressure of the compressed air system and the outlet water pressure of the fire pump; The controller is configured to, when the outlet air pressure and the outlet water pressure do not satisfy the pressure balance condition, according to the outlet air pressure and the outlet water pressure, call the electromagnetic proportional valve to adjust the opening degree of the intake valve until the outlet air pressure and the outlet water pressure satisfy the pressure balance condition.

[0014] The present invention also provides an electronic device, including a memory, a processor, and a computer program stored on the memory and executable on the processor. When the processor executes the computer program, the pressure balance control method for a compressed air foam system as described in any one of the above is implemented.

[0015] The present invention also provides a non-transitory computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, the pressure balance control method for a compressed air foam system as described in any one of the above is implemented.

[0016] The present invention also provides a computer program product, including a computer program. When the computer program is executed by a processor, the pressure balance control method for a compressed air foam system as described in any one of the above is implemented.

[0017] The pressure balance control method, device and system for a compressed air foam system provided by the present invention obtain the outlet air pressure of the compressed air system and the outlet water pressure of the fire pump in the compressed air foam system; when the outlet air pressure and the outlet water pressure do not meet the pressure balance condition, according to the outlet air pressure and the outlet water pressure, an electromagnetic proportional valve is called to adjust the opening degree of the intake valve in the compressed air system until the outlet air pressure and the outlet water pressure meet the pressure balance condition. The present invention uses an electromagnetic proportional valve to replace the traditional back pressure regulating valve, which can accurately control the opening degree of the intake valve through electric adjustment, and effectively solve the disadvantages of the traditional back pressure regulating valve, such as easy freezing at the water storage place, many connecting pipelines, complex pipeline systems, the need for regular replacement, and slow response to pressure changes. It avoids the freezing of the water pipeline in the pressure balance system, simplifies the system pipeline, has no pipeline frictional loss along the way, that is, not only eliminates the problems caused by pipeline freezing, but also greatly reduces the number and complexity of connecting pipelines, and also reduces potential failure points; by accurately controlling the opening degree of the intake valve in an electric control manner, the dynamic balance of air pressure and water pressure is achieved, ensuring smooth mixing of gas and liquid phases, and at the same time improving the low temperature adaptability of the CAFS system. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0019] Figure 1 It is a schematic diagram of the gas production process of the compressed air system provided by the present invention.

[0020] Figure 2 It is a schematic structural diagram of the piston type intake valve provided by the present invention.

[0021] Figure 3 It is a schematic structural diagram of the butterfly type intake valve provided by the present invention.

[0022] Figure 4 It is a working principle diagram of the balance valve provided by the prior art.

[0023] Figure 5 It is a working principle diagram of the balance valve adjusting the opening degree of the intake valve provided by the prior art.

[0024] Figure 6 It is one of the schematic flowcharts of the pressure balance control method for the compressed air foam system provided by the present invention.

[0025] Figure 7 It is a working principle diagram of the electromagnetic proportional valve for the opening degree of the intake valve provided by the present invention.

[0026] Figure 8 It is a schematic flow chart for determining the target opening degree provided by the present invention.

[0027] Figure 9 It is the second schematic flow chart of the pressure balance control method for the compressed air foam system provided by the present invention.

[0028] Figure 10 It is a schematic structural diagram of the pressure balance control device for the compressed air foam system provided by the present invention.

[0029] Figure 11 It is a schematic structural diagram of the compressed air foam system provided by the present invention.

[0030] Figure 12 It is a schematic structural diagram of the electronic device provided by the present invention. Detailed Embodiments

[0031] To make the objectives, technical solutions, and advantages of the present invention clearer, the technical solutions in the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the present invention. Apparently, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present invention without making creative efforts shall fall within the protection scope of the present invention.

[0032] The following will be described Figures 1 - 12 the pressure balance control method, device, and system for the compressed air foam system of the present invention.

[0033] First, a brief description will be given of the relevant content related to the present invention.

[0034] Compressed air foam fire extinguishing system: A fire extinguishing system composed of a compressed air system, a foam pump, a fire pump, a flow detection and control valve, a mixing pipeline, etc., which generates foam by mixing water, foam liquid, and compressed air for fire extinguishing.

[0035] The back pressure regulating valve, also known as the balance valve, is an automatic regulating module used to maintain the pressure at a specific point (usually the outlet end) of the CAFS system. It ensures that the back pressure (downstream pressure) is stable within a set range by controlling the fluid flow rate. The outlet pressure is monitored in real time through sensitive elements such as diaphragms and pistons. When the outlet pressure exceeds the set value, the valve automatically opens wider to release the excess pressure; when the pressure is lower than the set value, the valve closes smaller to reduce the pressure relief, thereby maintaining the pressure constant.

[0036] A Programmable Logic Controller (PLC) is a digital computing operation electronic system designed specifically for use in industrial environments. It uses a programmable memory to store instructions for performing operations such as logical operations, sequential control, timing, counting, and arithmetic operations internally. It controls various types of mechanical equipment or production processes through digital or analog inputs and outputs.

[0037] A compressed air system is a device that compresses air to increase pressure and is used to provide compressed air. See Figure 1 , Figure 1 is a schematic diagram of the gas production process of the compressed air system provided by the present invention: Free air passes through an air filter, intake valve, compressor, oil-gas separation tank, oil-gas separator core, and minimum pressure valve in the compressed air system in sequence, forming compressed gas, which is then discharged, i.e., exhausted.

[0038] Among them, the intake valve is installed on the intake port of the compressor main unit and is used to control the amount of inhaled air to achieve different working states such as air compressor loading, unloading, and proportional regulation. The intake valve usually consists of a valve body, an actuator (such as a servo cylinder), and a control element. There are various forms of intake valves, and piston type and butterfly type are commonly used according to the valve body structure.

[0039] See Figure 2 , Figure 2 is a schematic diagram of the structure of the piston type intake valve provided by the present invention: The piston type intake valve includes an intake port, a valve body, an outlet port, a piston, a sealing ring, and a control air port. The piston type intake valve controls the intake of the compressor by the up and down or left and right movement of the piston inside the intake valve, usually having only two states of opening / closing, and is generally used in small flow rate occasions.

[0040] See Figure 3 , Figure 3 is a schematic diagram of the structure of the butterfly type intake valve provided by the present invention: The butterfly type intake valve includes an intake port, a butterfly valve, a valve body, a check valve, an outlet port, a swing arm, a servo cylinder, and a control air port. The main structure of the butterfly type intake valve is a butterfly valve, and the moving part is a valve plate, which is pushed by the push rod of the servo cylinder. By controlling the opening / closing and opening degree of the valve plate, the control of the inlet flow rate can be achieved, and it is usually used in large flow rate occasions.

[0041] Currently, to maintain the balance between the compressed air pressure and the water pressure, a balance valve is usually used in the fire protection industry to adjust the opening degree of the intake valve of the compressed air system. See Figure 4 , Figure 4The following is the working principle diagram of the balance valve provided by the prior art: The lower part of the diaphragm plate (diaphragm) of the balance valve is connected to the outlet pressure of the fire pump, i.e., the water pressure, through the water inlet and pipeline; the upper part of the diaphragm plate is connected to the outlet pressure of the compressed air system, i.e., the air pressure, through the air inlet. The water pressure usually remains constant at a specific pressure. When the air pressure is lower than the water pressure, the air path in the upper part of the diaphragm plate is closed, i.e., the balance valve is closed; when the air pressure exceeds the water pressure, the air path in the upper part of the diaphragm plate is conducted, i.e., the balance valve is opened, and the conducted air is connected to the inlet valve on the intake port of the compressor through the air outlet.

[0042] Based on Figure 2 and Figure 4 refer to Figure 5 , Figure 5 The following is the working principle diagram of the balance valve for adjusting the opening degree of the inlet valve provided by the prior art: Compressed air enters the back pressure regulating valve (balance valve) through the filter, and the water provided by the fire pump also enters the balance valve; after the pressure of the compressed air exceeds the pressure of the water, the air path in the upper part of the diaphragm plate of the balance valve is conducted, and the conducted air is connected to the piston type inlet valve at the intake end of the compressor, reducing the opening degree of the inlet valve. After the opening degree of the inlet valve is reduced, the outlet air pressure of the compressed air system decreases accordingly; when the pressure of the compressed air is lower than the pressure of the water, the air path in the upper part of the diaphragm plate of the balance valve is closed, the air pressure entering the inlet valve decreases, and accordingly the opening degree of the inlet valve increases, and the gas pressure of the compressor increases. The air pressure of the compressed air system increases and decreases repeatedly through the balance valve and finally maintains balance with the water pressure. In addition, the air pressure can also be adjusted through a manual pressure regulating valve, and the manual pressure regulating valve is arranged between the inlet valve and the balance valve. Compressed air can also enter the manual pressure regulating valve through a 2-position 2-way solenoid valve, and this solenoid valve is normally open and closed during the operation of the system.

[0043] Figure 6 The following is one of the flow schematic diagrams of the pressure balance control method for the compressed air foam system provided by the present invention. As Figure 6 shown, this method includes step 601 and step 602.

[0044] Step 601: Obtain the outlet air pressure of the compressed air system and the outlet water pressure of the fire pump in the compressed air foam system.

[0045] Specifically, the outlet air pressure of the compressed air system refers to the pressure of the gas discharged from the outlet of the compressed air system, and the outlet water pressure of the fire pump refers to the pressure of the liquid discharged from the outlet of the fire pump.

[0046] In practical applications, the air pressure (outlet air pressure) at the outlet of the compressed air system and the water pressure (outlet water pressure) at the outlet of the fire pump can be collected in real time by using pressure sensors.

[0047] Preferably, a gas pressure sensor can be provided at the outlet of the compressed air system to obtain the outlet air pressure; a liquid pressure sensor can be provided at the outlet of the fire pump to obtain the outlet water pressure. In this way, not only can the efficiency of obtaining the outlet air pressure and the outlet water pressure be improved, but also the accuracy of the outlet air pressure and the outlet water pressure can be improved, thereby improving the efficiency of pressure control.

[0048] Step 602, when the outlet air pressure and the outlet water pressure do not meet the pressure balance condition, according to the outlet air pressure and the outlet water pressure, call the electromagnetic proportional valve to adjust the opening degree of the intake valve in the compressed air system until the outlet air pressure and the outlet water pressure meet the pressure balance condition.

[0049] Specifically, the pressure balance condition refers to the condition that the outlet air pressure and the outlet water pressure are in relative balance. For example, the outlet air pressure is equal to the outlet water pressure. The intake valve can be a piston type intake valve or a butterfly type intake valve.

[0050] In practical applications, after the pressure sensor obtains the outlet air pressure and the outlet water pressure, the outlet air pressure and the outlet water pressure can be sent to the controller. The controller can be a Programmable Logic Controller (PLC). Further, the controller can determine whether the outlet air pressure and the outlet water pressure meet the pressure balance condition: if they meet, no further operation is required and the current outlet air pressure and outlet water pressure can be maintained; if they do not meet, the opening degree of the intake valve needs to be adjusted through the electromagnetic proportional valve so that the outlet air pressure of the compressed air system and the outlet water pressure of the fire pump meet the pressure balance condition.

[0051] Exemplarily, on the basis of Figure 5 refer to Figure 7 , Figure 7 is the working principle diagram of the opening degree of the electromagnetic proportional valve intake valve provided by the present invention: replace the back pressure regulating valve (balance valve) in Figure 5 with an electromagnetic proportional valve (capacity regulating valve), and the PLC controls the opening degree to adjust the air pressure according to the water pressure, that is, the PLC adjusts the opening degree of the intake valve through the electromagnetic proportional valve according to the outlet air pressure and the outlet water pressure, thereby adjusting the outlet air pressure of the compressed air system.

[0052] The pressure balance control method for a compressed air foam system provided by the present invention obtains the outlet air pressure of the compressed air system and the outlet water pressure of the fire pump in the compressed air foam system; when the outlet air pressure and the outlet water pressure do not meet the pressure balance condition, the electromagnetic proportional valve is called to adjust the opening degree of the intake valve in the compressed air system according to the outlet air pressure and the outlet water pressure until the outlet air pressure and the outlet water pressure meet the pressure balance condition. The present invention uses an electromagnetic proportional valve to replace the traditional back-pressure regulating valve, which can accurately control the opening degree of the intake valve through electric adjustment, and effectively solves the disadvantages of the traditional back-pressure regulating valve, such as easy freezing at the water storage place, many connecting pipelines, complex pipeline systems, the need for regular replacement, and slow response to pressure changes, avoids the freezing of the water pipeline in the pressure balance system, simplifies the system pipeline, and there is no pipeline frictional loss; by accurately controlling the opening degree of the intake valve in an electric control manner, the dynamic balance of air pressure and water pressure is achieved, ensuring smooth mixing of gas and liquid phases, and at the same time improving the low-temperature adaptability of the CAFS system.

[0053] In one or more alternative embodiments of the present invention, the pressure balance condition is that the outlet air pressure is greater than or equal to a first pressure threshold and less than or equal to a second pressure threshold. The first pressure threshold is the product of the outlet water pressure and a first set value, the second pressure threshold is the product of the outlet water pressure and a second set value, and the first set value is less than the second set value.

[0054] In this way, setting the pressure threshold based on the outlet water pressure can ensure the reliability of the pressure balance condition. Further, based on the pressure balance condition for pressure control, the outlet air pressure and the outlet water pressure can be in a balanced state, thereby improving the fire extinguishing ability of the compressed air foam system.

[0055] Preferably, since the standard document of the compressed air foam system requires that the difference between the outlet pressure of the compressed air system and the outlet pressure of the fire pump is not greater than 15%, that is, the outlet pressure of the compressed air system is greater than or equal to the outlet pressure of the fire pump, and the outlet pressure of the compressed air system is not greater than 1.15 times the outlet pressure of the fire pump, the first set value can be set to 1 and the second set value can be set to 1.15. The pressure balance condition is that the outlet air pressure is greater than or equal to the outlet water pressure and less than or equal to 1.15 times the outlet water pressure.

[0056] In one or more alternative embodiments of the present invention, the step of calling the electromagnetic proportional valve to adjust the opening degree of the intake valve in the compressed air system according to the outlet air pressure and the outlet water pressure includes: Processing the outlet air pressure and the outlet water pressure using a proportional-integral-derivative algorithm to obtain the target opening degree corresponding to the intake valve in the compressed air system; Adjust by calling the electromagnetic proportional valve to adjust the opening degree of the intake valve in the compressed air system to the target opening degree.

[0057] Specifically, the Proportion Integral Differential (PID) algorithm refers to an algorithm that controls according to the proportion, integral, and differential of the deviation.

[0058] In practical applications, when the outlet air pressure and the outlet water pressure do not meet the pressure balance condition, the PID algorithm can be used to process the outlet air pressure and the outlet water pressure, so as to determine the target opening degree corresponding to the intake valve. Further, the electromagnetic proportional valve is adjusted to adjust the intake valve according to the target opening degree, so that the opening degree of the intake valve is the target opening degree.

[0059] In the embodiment of the present invention, by using the PID algorithm to determine the target opening degree, not only can the efficiency of determining the target opening degree be improved, it is easy to implement, convenient to adjust and optimize the control effect, can quickly respond to the change of pressure, reduce overshoot and oscillation, improve the dynamic performance of pressure control, eliminate the static error based on the integral action, but also can improve the accuracy of the target opening degree, thereby improving the efficiency and stability of pressure control.

[0060] In one or more alternative embodiments of the present invention, the processing of the outlet air pressure and the outlet water pressure by using the proportional integral differential algorithm to obtain the target opening degree corresponding to the intake valve in the compressed air system includes: Obtain the target difference between the outlet air pressure and the outlet water pressure, and calculate the actual difference between the outlet air pressure and the outlet water pressure; Calculate the deviation between the target difference and the actual difference; Use the proportional integral differential algorithm to perform proportional integral differential adjustment on the deviation to obtain the target opening degree corresponding to the intake valve in the compressed air system.

[0061] See Figure 8 , Figure 8It is a schematic flow chart for determining the target opening degree provided by the present invention: The target difference can be obtained, that is, the standard difference between the set outlet air pressure and the outlet water pressure; and the actual difference between the outlet air pressure and the outlet water pressure obtained through the pressure sensor is calculated. Further, the target difference is subtracted from the actual difference to obtain the deviation between the target difference and the actual difference, and this deviation is respectively input into the proportional link, integral link, and derivative link in the PID algorithm for processing. The processing results of each link are superimposed, and finally the target opening degree is obtained. Then, based on the actuator (electromagnetic proportional valve), the intake valve is adjusted according to the target opening degree to control the outlet air pressure and the outlet water pressure to be in a relatively balanced state. In this way, determining the target opening degree based on the target difference and the actual difference can further ensure the accuracy rate of the target opening degree, thereby improving the efficiency and stability of pressure control.

[0062] Exemplarily, the PID algorithm controls the controlled quantity (the opening degree of the regulating valve) through the error signal (the deviation between the target difference and the actual difference), and the controller itself is the superposition of the proportional, integral, and derivative three links. It is set that at time t, the input quantities of the PID algorithm include the target difference Pg(t) and the actual difference Pr(t), and the deviation quantity is the deviation E(t)=Pg(t)-Pr(t), then the target opening degree u(t) can be calculated by the following formula: Wherein, Kp, Ki, and Kd are respectively the proportional gain, integral gain, and derivative gain of the PID algorithm.

[0063] In one or more alternative embodiments of the present invention, the calling the electromagnetic proportional valve to adjust and adjusting the opening degree of the intake valve in the compressed air system to the target opening degree includes: In the case where the outlet air pressure is less than the first pressure threshold, calling the electromagnetic proportional valve to adjust and increasing the opening degree of the intake valve in the compressed air system to the target opening degree; In the case where the outlet air pressure is greater than the second pressure threshold, calling the electromagnetic proportional valve to adjust and reducing the opening degree of the intake valve in the compressed air system to the target opening degree.

[0064] In practical applications, if the outlet air pressure is less than the first pressure threshold, it means that the outlet air pressure is too low, and the opening degree of the intake valve can be increased to the target opening degree to increase the intake air volume, so as to increase the compressor gas pressure, thereby increasing the outlet air pressure of the compressed air system; if the outlet air pressure is greater than the second pressure threshold, it means that the outlet air pressure is too high, and the opening degree of the intake valve can be reduced to the target opening degree to reduce the intake air volume, so as to reduce the compressor gas pressure, thereby reducing the outlet air pressure of the compressed air system.

[0065] In one or more alternative embodiments of the present invention, the pulse width modulation frequency of the electromagnetic proportional valve is greater than 1000 Hertz (Hz), the repeatability accuracy is less than or equal to 1%, the sensitivity is less than or equal to 0.1%, and the maximum pressure is 1.0 Megapascal (Mpa). The embodiments of the present invention adopt an electromagnetic proportional valve with a pulse width modulation frequency > 1000 Hz, a repeatability accuracy ≤ 1%, a sensitivity ≤ 0.1%, and a maximum pressure of 1.0 Mpa, ensuring fast response to commands and working stability.

[0066] The following Figure 9 further describes the pressure balance control method for a compressed air foam system provided by the present invention.

[0067] See Figure 9 , Figure 9 is the second schematic flow chart of the pressure balance control method for a compressed air foam system provided by the present invention: using a pressure sensor to collect water pressure and air pressure signals in real time, that is, collecting the outlet air pressure of the compressed air system and the outlet water pressure of the fire pump in the compressed air foam system, and transmitting these data to the PLC. The PLC uses the PID algorithm to adjust the opening degree of the electromagnetic proportional valve to control the intake valve according to the input water pressure and air pressure: when it is detected that the air pressure exceeds 1.15 times the water pressure, that is, (air pressure / water pressure) > 1.15, the opening degree of the intake valve is reduced through the electromagnetic proportional valve to reduce the air intake; when the air pressure is lower than the water pressure, that is, (air pressure / water pressure) > 1.15, the opening degree of the intake valve is increased through the electromagnetic proportional valve to increase the air supply; finally, the air pressure at the outlet of the compressed air system is maintained within the range of 1 to 1.15 times the water pressure, that is, 1 ≤ (air pressure / water pressure) ≤ 1.15, and the PLC will maintain the current opening degree of the intake valve and continue to stably provide the required air flow to ensure the dynamic balance between the air pressure and the water pressure.

[0068] The embodiments of the present invention simplify the mechanical structure by means of an electric control method. The electromagnetic proportional valve replaces the traditional back pressure regulating valve, which not only eliminates the problems caused by pipeline freezing, but also greatly reduces the number and complexity of connecting pipelines, and also reduces potential failure points, thereby improving the reliability and maintenance convenience of the entire compressed air foam system. In addition, the embodiments of the present invention are controlled by a pressure sensor and a PLC, which can more accurately detect the changes in air pressure and water pressure, and quickly adjust the pressure balance, effectively improving the reaction speed of the compressed air foam system, realizing smooth mixing of gas and liquid phases, and ensuring the best foam generation conditions under various working conditions.

[0069] The following describes the pressure balance control device for a compressed air foam system provided by the present invention. The pressure balance control device for a compressed air foam system described below can be correspondingly referred to the pressure balance control method for a compressed air foam system described above.

[0070] See Figure 10 , Figure 10 which is a schematic structural diagram of a pressure balance control device for a compressed air foam system provided by the present invention, including: An acquisition module 1001, configured to acquire the outlet air pressure of the compressed air system and the outlet water pressure of the fire pump in the compressed air foam system; An adjustment module 1002, configured to, when the outlet air pressure and the outlet water pressure do not meet the pressure balance condition, according to the outlet air pressure and the outlet water pressure, call an electromagnetic proportional valve to adjust the opening degree of the intake valve in the compressed air system until the outlet air pressure and the outlet water pressure meet the pressure balance condition.

[0071] For the pressure balance control device for a compressed air foam system provided by the present invention, an electromagnetic proportional valve is used to replace the traditional back pressure regulating valve, which can accurately control the opening degree of the intake valve through electric adjustment, and effectively solve the disadvantages of the traditional back pressure regulating valve, such as easy freezing at the water storage place, many connecting pipelines, complex pipeline, need for regular replacement, and slow response to pressure changes, avoiding the freezing of the water pipeline in the pressure balance system, streamlining the system pipeline, and having no pipeline frictional loss; by accurately controlling the opening degree of the intake valve in an electric control manner, dynamic balance between air pressure and water pressure is achieved, ensuring smooth mixing of gas and liquid phases, and at the same time improving the low-temperature adaptability of the CAFS system. Optionally, the pressure balance condition is that the outlet air pressure is greater than or equal to a first pressure threshold and less than or equal to a second pressure threshold, the first pressure threshold is the product of the outlet water pressure and a first set value, the second pressure threshold is the product of the outlet water pressure and a second set value, and the first set value is less than the second set value.

[0072] Optionally, the adjustment module 1002 is specifically configured to: Process the outlet air pressure and the outlet water pressure by using a proportional integral derivative algorithm to obtain the target opening degree corresponding to the intake valve in the compressed air system; Call the electromagnetic proportional valve to adjust and adjust the opening degree of the intake valve in the compressed air system to the target opening degree.

[0073] Optionally, the adjustment module 1002 is specifically configured to: Obtain the target difference between the outlet air pressure and the outlet water pressure, and calculate the actual difference between the outlet air pressure and the outlet water pressure; Calculate the deviation between the target difference and the actual difference; Use a proportional integral derivative algorithm to perform proportional integral derivative adjustment on the deviation to obtain the target opening degree corresponding to the intake valve in the compressed air system.

[0074] Optionally, the adjustment module 1002 is specifically configured to: When the outlet air pressure is less than the first pressure threshold, call the electromagnetic proportional valve to adjust and increase the opening degree of the intake valve in the compressed air system to the target opening degree; When the outlet air pressure is greater than the second pressure threshold, call the electromagnetic proportional valve to adjust and decrease the opening degree of the intake valve in the compressed air system to the target opening degree.

[0075] Optionally, the pulse width modulation frequency of the electromagnetic proportional valve is greater than 1000 Hz, the repeat accuracy is less than or equal to 1%, the sensitivity is less than or equal to 0.1%, and the maximum pressure is 1.0 MPa.

[0076] The compressed air foam system provided by the present invention will be described below. The compressed air foam system described below can be correspondingly referred to the pressure balance control method for the compressed air foam system described above.

[0077] See Figure 11 , Figure 11 is a schematic structural diagram of the compressed air foam system provided by the present invention. The compressed air foam system includes: A compressed air system 1101, a fire pump 1102, a pressure sensor 1103, a controller 1104, and an electromagnetic proportional valve 1105. The compressed air system 1101 includes an intake valve 1106; The pressure sensor 1103 is used to obtain the outlet air pressure of the compressed air system 1101 and the outlet water pressure of the fire pump 1102; The controller 1104 is used to, when the outlet air pressure and the outlet water pressure do not meet the pressure balance condition, call the electromagnetic proportional valve to adjust the opening degree of the intake valve 1106 according to the outlet air pressure and the outlet water pressure until the outlet air pressure and the outlet water pressure meet the pressure balance condition.

[0078] The compressed air foam system provided by the present invention uses an electromagnetic proportional valve to replace the traditional back pressure regulating valve, can accurately control the opening degree of the intake valve through electric adjustment, and effectively solves the disadvantages of the traditional back pressure regulating valve, such as easy freezing at the water storage place, many connecting pipelines, complex pipeline systems, regular replacement required, and slow response to pressure changes. It avoids the freezing of the water pipeline in the pressure balance system, simplifies the system pipeline, and has no pipeline along - the - way loss; by accurately controlling the opening degree of the intake valve in an electric control manner, it realizes the dynamic balance of air pressure and water pressure, ensures the smooth mixing of gas - liquid two - phase, and at the same time improves the low - temperature adaptability of the CAFS system.

[0079] Optionally, the pressure balance condition is that the outlet air pressure is greater than or equal to a first pressure threshold and less than or equal to a second pressure threshold. The first pressure threshold is the product of the outlet water pressure and a first set value, and the second pressure threshold is the product of the outlet water pressure and a second set value, where the first set value is less than the second set value.

[0080] Optionally, the controller 1104 is specifically configured to: Process the outlet air pressure and the outlet water pressure using a proportional-integral-derivative algorithm to obtain a target opening degree corresponding to the intake valve 1106 in the compressed air system 1101; Invoke the electromagnetic proportional valve regulator 1105 to adjust the opening degree of the intake valve 1106 in the compressed air system 1101 to the target opening degree.

[0081] Optionally, the controller 1104 is specifically configured to: Obtain a target difference between the outlet air pressure and the outlet water pressure, and calculate an actual difference between the outlet air pressure and the outlet water pressure; Calculate a deviation between the target difference and the actual difference; Use a proportional-integral-derivative algorithm to perform proportional-integral-derivative regulation on the deviation to obtain a target opening degree corresponding to the intake valve 1106 in the compressed air system 1101.

[0082] Optionally, the controller 1104 is specifically configured to: When the outlet air pressure is less than the first pressure threshold, invoke the electromagnetic proportional valve regulator 1105 to increase the opening degree of the intake valve 1106 in the compressed air system 1101 to the target opening degree; When the outlet air pressure is greater than the second pressure threshold, invoke the electromagnetic proportional valve regulator 1105 to decrease the opening degree of the intake valve 1106 in the compressed air system 1101 to the target opening degree.

[0083] Optionally, the pulse width modulation frequency of the electromagnetic proportional valve 1105 is greater than 1000 Hz, the repeat accuracy is less than or equal to 1%, the sensitivity is less than or equal to 0.1%, and the maximum pressure is 1.0 MPa.

[0084] In addition, the compressed air foam system may further include a foam pump, a flow rate detection and control valve, a mixing pipeline, etc.

[0085] Figure 12 An example of a schematic physical structure diagram of an electronic device is shown in Figure 12As shown in the figure, the electronic device may include: a processor 1210, a communications interface 1220, a memory 1230, and a communication bus 1240. Among them, the processor 1210, the communications interface 1220, and the memory 1230 complete mutual communication through the communication bus 1240. The processor 1210 can call the logical instructions in the memory 1230 to execute a pressure balance control method for a compressed air foam system. The method includes: obtaining the outlet air pressure of the compressed air system and the outlet water pressure of the fire pump in the compressed air foam system; when the outlet air pressure and the outlet water pressure do not meet the pressure balance condition, according to the outlet air pressure and the outlet water pressure, calling an electromagnetic proportional valve to adjust the opening degree of the intake valve in the compressed air system until the outlet air pressure and the outlet water pressure meet the pressure balance condition.

[0086] In addition, when the logical instructions in the above-mentioned memory 1230 are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on such an understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or a part of this 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 for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in various embodiments of the present invention. The foregoing storage medium includes: various media such as USB flash drives, mobile hard disks, read-only memories (ROM, Read-Only Memory), random access memories (RAM, Random Access Memory), magnetic disks, or optical discs that can store program codes.

[0087] On the other hand, the present invention also provides a computer program product. The computer program product includes a computer program. The computer program can be stored on a non-transitory computer-readable storage medium. When the computer program is executed by a processor, the computer can execute the pressure balance control method for a compressed air foam system provided by the above-mentioned various methods. The method includes: obtaining the outlet air pressure of the compressed air system and the outlet water pressure of the fire pump in the compressed air foam system; when the outlet air pressure and the outlet water pressure do not meet the pressure balance condition, according to the outlet air pressure and the outlet water pressure, calling an electromagnetic proportional valve to adjust the opening degree of the intake valve in the compressed air system until the outlet air pressure and the outlet water pressure meet the pressure balance condition.

[0088] In another aspect, the present invention also provides a non-transitory computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, it implements a pressure balance control method for a compressed air foam system provided by the above-mentioned various methods. The method includes: obtaining the outlet air pressure of the compressed air system and the outlet water pressure of the fire pump in the compressed air foam system; when the outlet air pressure and the outlet water pressure do not meet the pressure balance condition, according to the outlet air pressure and the outlet water pressure, calling an electromagnetic proportional valve to adjust the opening degree of the intake valve in the compressed air system until the outlet air pressure and the outlet water pressure meet the pressure balance condition.

[0089] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place, or may be distributed to multiple network units. Some or all of the modules can be selected according to actual needs to achieve the purpose of the solution of this embodiment. Those of ordinary skill in the art can understand and implement it without creative effort.

[0090] Through the description of the above embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus a necessary general hardware platform, and of course, it can also be implemented by hardware. Based on this understanding, the essence of the above technical solution, or the part that contributes to the prior art, can be embodied in the form of a software product. The computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, magnetic disk, optical disc, etc., and includes several instructions to enable a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in each embodiment or some parts of the embodiments.

[0091] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A pressure balance control method for a compressed air foam system, characterized in that: include: Obtain the outlet air pressure of the compressed air system and the outlet water pressure of the fire water pump in the compressed air foam system; When the outlet air pressure and the outlet water pressure do not satisfy the pressure balance condition, the electromagnetic proportional valve is called to adjust the opening of the air inlet valve in the compressed air system according to the outlet air pressure and the outlet water pressure until the outlet air pressure and the outlet water pressure satisfy the pressure balance condition.

2. The pressure balance control method for a compressed air foam system according to claim 1, characterized in that: The pressure balance condition is that the outlet air pressure is greater than or equal to a first pressure threshold, and the outlet air pressure is less than or equal to a second pressure threshold, the first pressure threshold is the product of the outlet water pressure and a first set value, the second pressure threshold is the product of the outlet water pressure and a second set value, and the first set value is less than the second set value.

3. The pressure balance control method for a compressed air foam system according to claim 2, characterized in that: The step of calling the electromagnetic proportional valve to adjust the opening of the air inlet valve in the compressed air system according to the outlet air pressure and the outlet water pressure comprises: The outlet air pressure and the outlet water pressure are processed by using a proportional-integral-differential algorithm to obtain a target opening corresponding to an air intake valve in the compressed air system; The electromagnetic proportional valve is called to adjust the opening of the air intake valve in the compressed air system to the target opening.

4. The pressure balance control method for a compressed air foam system according to claim 3, characterized in that: The method of using a proportional-integral-differential algorithm to process the outlet air pressure and the outlet water pressure to obtain a target opening corresponding to the air intake valve in the compressed air system includes: Obtaining a target difference between the outlet air pressure and the outlet water pressure, and calculating an actual difference between the outlet air pressure and the outlet water pressure; Calculating a deviation between the target difference and the actual difference; A proportional-integral-differential algorithm is used to perform proportional-integral-differential adjustment on the deviation to obtain a target opening corresponding to the air intake valve in the compressed air system.

5. The pressure balance control method for a compressed air foam system according to claim 3, characterized in that: The calling of the electromagnetic proportional valve to adjust the opening of the air intake valve in the compressed air system to the target opening includes: When the outlet air pressure is less than the first pressure threshold, the electromagnetic proportional valve is called to adjust and the opening of the air inlet valve in the compressed air system is increased to the target opening; When the outlet air pressure is greater than the second pressure threshold, the electromagnetic proportional valve is called to adjust to reduce the opening of the air intake valve in the compressed air system to the target opening.

6. The pressure balance control method for a compressed air foam system according to any one of claims 1 to 5, characterized in that: The pulse width modulation frequency of the electromagnetic proportional valve is greater than 1000 Hz, the repeatability is less than or equal to 1%, the sensitivity is less than or equal to 0.1%, and the maximum pressure is 1.0 MPa.

7. A pressure balance control device for a compressed air foam system, characterized in that: include: An acquisition module is configured to acquire an outlet air pressure of a compressed air system and an outlet water pressure of a fire water pump in a compressed air foam system; The regulating module is configured to call the electromagnetic proportional valve to adjust the opening of the air inlet valve in the compressed air system according to the outlet air pressure and the outlet water pressure when the outlet air pressure and the outlet water pressure do not meet the pressure balance condition until the outlet air pressure and the outlet water pressure meet the pressure balance condition.

8. A compressed air foam system, characterized in that: include: Compressed air system, fire water pump, pressure sensor, controller, solenoid proportional valve, the compressed air system includes an air intake valve; The pressure sensor is used to obtain the outlet air pressure of the compressed air system and the outlet water pressure of the fire water pump; The controller is used to call the electromagnetic proportional valve to adjust the opening of the intake valve according to the outlet air pressure and the outlet water pressure when the outlet air pressure and the outlet water pressure do not meet the pressure balance condition until the outlet air pressure and the outlet water pressure meet the pressure balance condition.

9. An electronic device comprising a memory, a processor, and a computer program stored in the memory and running on the processor, characterized in that: When the processor executes the computer program, the pressure balance control method for a compressed air foam system according to any one of claims 1 to 6 is implemented.

10. A non-transitory computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the pressure balance control method for a compressed air foam system according to any one of claims 1 to 6 is implemented.

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