Vehicle-mounted solidifying extinguishing agent proportioning control system, control method and fire truck

Abstract

This application relates to the field of fire protection technology, specifically to a vehicle-mounted solidifying extinguishing agent proportioning control system, control method, and fire truck. The system includes a first flow regulation component and a second flow regulation component. The first flow regulation component includes a first solution pump and a first return bypass connected in parallel with the first solution pump, with a first bypass regulating valve installed on the first return bypass. The second flow regulation component includes a second solution pump and a second return bypass connected in parallel with the second solution pump, with a second bypass regulating valve installed on the second return bypass. The controller is configured to first coarsely adjust the solution flow rate by adjusting the rotation speed of the first or second solution pump, and then finely adjust the solution flow rate by adjusting the opening of the first or second bypass regulating valve. This system effectively improves the adjustment response speed and mixing ratio accuracy of the solution flow rate through a two-stage flow regulation method combining coarse adjustment of the solution pump rotation speed and fine adjustment of the parallel bypass valve.

Description

Technical Field

[0001] This application relates to the field of fire protection technology, specifically to a vehicle-mounted solidifying extinguishing agent proportioning control system, a fire truck including the vehicle-mounted solidifying extinguishing agent proportioning control system, a corresponding control method for the vehicle-mounted solidifying extinguishing agent proportioning control system, and a controller. Background Technology

[0002] Currently, among the commonly used fire extinguishing agent mixing systems in fire trucks, compressed air foam systems (CAFS) are widely used. This system typically mixes water and Class A foam concentrate in a certain proportion, then injects compressed air to create foam before spraying it for fire extinguishing. Regarding flow regulation, CAFS mainly employs the following method: controlling the injection flow rate of the foam concentrate by adjusting the pump speed via a hydraulic motor or electric motor. However, this method makes it difficult to effectively guarantee the mixing accuracy of the system. Furthermore, the above flow regulation method has the following shortcomings in practical applications: First, controlling flow rate solely by adjusting the foam pump speed results in a slow response, especially when using a hydraulic motor. The hydraulic system's significant inertia leads to a noticeable lag in speed adjustment, making it difficult to quickly respond to fluctuations in the mixing ratio caused by changes in water flow. Second, the hydraulic motor's speed control precision is poor, easily leading to repeated fluctuations in the actual flow rate around the target value, failing to achieve stable convergence. This repeated fluctuation not only affects the stability of the mixing ratio but may also cause additional wear on the pump and drive system. Furthermore, existing compressed air foam systems are only suitable for mixing a single foam concentrate with water, and cannot meet the special operational requirements of two-component solutions that need to be mixed in a specific order and undergo a coagulation reaction. Summary of the Invention

[0003] Based on this, it is necessary to provide a vehicle-mounted solidified extinguishing agent proportioning control system, control method, and fire truck to address the aforementioned technical problems. By adopting a two-stage flow regulation structure that combines coarse adjustment of the main pump speed with fine adjustment of the parallel bypass valve, rapid response and high-precision regulation are achieved, effectively avoiding repeated fluctuations in pump speed. At the same time, the system is suitable for the mixed spraying of two-component solidified extinguishing agents, thus having a wider range of applications.

[0004] In a first aspect, this application provides a vehicle-mounted solidifying fire extinguishing agent proportioning control system, including a first conveying channel for conveying a first component solution and a second conveying channel for conveying a second component solution, wherein the first component solution and the second component solution undergo a solidification reaction after being mixed; a first flow regulating component is provided on the first conveying channel, and a second flow regulating component is provided on the second conveying channel; The first flow regulating component includes a first solution pump disposed on the first delivery channel and a first reflux bypass disposed in parallel with the first solution pump, wherein a first bypass regulating valve is disposed on the first reflux bypass; and / or, the second flow regulating component includes a second solution pump disposed on the second delivery channel and a second reflux bypass disposed in parallel with the second solution pump, wherein a second bypass regulating valve is disposed on the second reflux bypass. The system also includes a controller configured to first coarsely adjust the solution flow rate by adjusting the rotation speed of the first solution pump or the second solution pump, and then finely adjust the solution flow rate by adjusting the opening degree of the first bypass regulating valve or the second bypass regulating valve.

[0005] In one embodiment, the system further includes a third delivery channel for water delivery, a compressed air input line, and at least one extinguishing agent output line. Each extinguishing agent output line is connected to the first delivery channel, the second delivery channel, the third delivery channel, and the compressed air input line via a mixing chamber. Each extinguishing agent output line is equipped with an extinguishing agent outlet valve that is signal-connected to the controller.

[0006] In one embodiment, the end of the first conveying channel and the end of the third conveying channel merge to form a main channel for the mixed liquid. The main channel for the mixed liquid is provided with mixed liquid branches corresponding to the number of fire extinguishing agent output pipelines. Each mixed liquid branch is connected to the mixing chamber on the corresponding fire extinguishing agent output pipeline.

[0007] In one embodiment, a first container, a first tank supply valve, a first solution pump, a first flow meter, and a first delivery valve are sequentially arranged along the conveying direction on the first conveying channel. The first solution pump, the first flow meter, and the first delivery valve are respectively signal-connected to the controller. The first flow meter and the first delivery valve are located between the outlet of the first solution pump and the inlet of the main channel of the mixed liquid. The inlet end of the first reflux bypass is connected between the outlet of the first solution pump and the first flow meter, and the outlet end of the first reflux bypass is connected between the first tank supply valve and the inlet of the first solution pump.

[0008] In one embodiment, the first conveying channel is further provided with a third reflux bypass, the inlet end of the third reflux bypass is connected between the inlet end of the first reflux bypass and the first flow meter, and the outlet end of the third reflux bypass is connected to the first container; the third reflux bypass is provided with a first tank filling valve for reversing the flow of the first component solution back to the first container.

[0009] In one embodiment, a first external suction port is provided between the first tank supply valve and the outlet end of the first reflux bypass. The first solution pump is configured to draw in the first component solution from the first tank through the first tank supply valve, or to draw in the solution externally through the first external suction port.

[0010] In one embodiment, a water tank, a tank water supply valve, a water pump, a water flow meter, and a water flow regulating valve are sequentially arranged along the conveying direction on the third conveying channel. The water pump, water flow meter, and water flow regulating valve are respectively connected to the controller signal. The water flow meter and water flow regulating valve are located between the outlet of the water pump and the inlet of the main channel of the mixed liquid. An external water suction port is provided between the water supply valve of the tank and the inlet of the water pump. The water pump is configured to draw water from the water tank through the water supply valve or to supply water externally through the external water suction port.

[0011] In one embodiment, the system further includes a pressure sensor signal-connected to the controller, the pressure sensor being disposed on the main mixing channel.

[0012] In one embodiment, the second delivery channel includes a main channel for the second component solution and branch channels for the second component solution branch channel. The number of the second component solution branch channels corresponds to the number of the extinguishing agent output pipelines. The second component solution branch channel is connected to the mixing chamber of the corresponding extinguishing agent output pipeline. Each second component solution branch channel is provided with a second delivery valve, and the second delivery valve is signal-connected to the controller.

[0013] In one embodiment, a second tank, a second tank supply valve, a second solution pump, and a second flow meter are sequentially arranged along the conveying direction on the main channel of the second component solution. The second solution pump and the second flow meter are respectively connected to the controller signal. The second flow meter is located between the outlet of the second solution pump and the inlet of the main channel of the second component solution. The inlet end of the second reflux bypass is connected between the outlet of the second solution pump and the second flow meter, and the outlet end of the second reflux bypass is connected between the second tank supply valve and the inlet of the second solution pump.

[0014] In one embodiment, a fourth reflux bypass is also provided on the main channel of the second component solution. The inlet end of the fourth reflux bypass is connected between the inlet end of the second reflux bypass and the second flow meter, and the outlet end of the fourth reflux bypass is connected to the second container. A second tank filling valve is provided on the fourth reflux bypass for reverse conveying the second component solution back to the second container.

[0015] In one embodiment, a second external suction port is provided between the second tank supply valve and the outlet end of the second reflux bypass. The second solution pump is configured to draw the second component solution from the second tank through the second tank supply valve, or to draw and supply liquid externally through the second external suction port.

[0016] In one embodiment, the compressed air input pipeline includes a main compressed air channel and compressed air branches branching off from the main compressed air channel. The number of compressed air branches corresponds to the number of fire extinguishing agent output pipelines. Each compressed air branch is connected to the mixing chamber of the corresponding fire extinguishing agent output pipeline. Each compressed air branch is equipped with an air regulating valve, and the air regulating valve is signal-connected to the controller.

[0017] Secondly, this application also provides a fire truck equipped with a vehicle-mounted solidifying extinguishing agent proportioning control system as described in any of the preceding claims.

[0018] Thirdly, this application also provides a method for controlling the proportion of a vehicle-mounted solidifying extinguishing agent, applied to the vehicle-mounted solidifying extinguishing agent proportioning control system as described in any of the preceding claims, comprising: The supply of water, the first component solution, and compressed air is started sequentially to mix the water with the first component solution and create foam to form a foam mixture. In response to the detection that the system pressure has reached a preset protection threshold, the supply of the second component solution is started, the second component solution is injected into the foam mixture, and after mixing, the solidifying fire extinguishing agent is output; Specifically, when starting the supply of the first and second component solutions, two-stage flow regulation is performed: first, the speed of the corresponding solution pump is adjusted for coarse adjustment, and then the opening of the corresponding parallel bypass valve is adjusted for fine adjustment.

[0019] In one embodiment, the two-stage flow regulation includes: Obtain the actual water flow rate; Calculate the target flow rate of the corresponding component solution based on the actual water flow rate and the preset mixing ratio; Adjust the rotational speed of the corresponding solution pump based on the target flow rate to perform a coarse adjustment of the actual flow rate of the component solution; If the difference between the actual flow rate and the target flow rate is detected to be within a preset threshold range, the speed of the solution pump is kept constant, and the actual flow rate of the component solution is finely adjusted by adjusting the opening of the corresponding parallel bypass valve.

[0020] In one embodiment, when the difference between the actual flow rate and the target flow rate is within the range of the preset threshold, the change in water flow rate is monitored in real time. If the change in water flow rate is less than the preset value, the speed of the solution pump is kept constant, and fine-tuning is continued by adjusting the opening of the corresponding parallel bypass valve. If the change in water flow rate is greater than or equal to the preset value, the speed of the corresponding solution pump is readjusted for coarse adjustment.

[0021] In one embodiment, before starting the compressed air supply, the method further includes: detecting the actual flow rate of the first component solution; if the actual flow rate of the first component solution is detected to be zero, then the start of the compressed air supply is prohibited. And / or, during the process of discharging the solidifying extinguishing agent, the method further includes: detecting the actual flow rate of the first component solution; if the actual flow rate of the first component solution is detected to be zero, then shutting off the compressed air supply.

[0022] In one embodiment, during the dispensing of the solidifying extinguishing agent, the method further includes: Real-time monitoring of system stress: If the system pressure is less than the preset protection threshold, the supply of the second component solution is shut off; If the system pressure is greater than or equal to the preset protection threshold, the supply of the second component solution is maintained or restarted.

[0023] In one embodiment, the method further includes: A spray termination command has been detected. Turn off the supply of the second component solution, compressed air, first component solution, and water in reverse order of startup sequence.

[0024] Fourthly, this application also provides a controller, including a memory and a processor, wherein the memory stores a computer program, and the processor executes the computer program to implement the steps of the method as described in any of the preceding claims.

[0025] One of the above technical solutions has the following advantages or beneficial effects: By setting solution pumps and parallel reflux bypasses on the first and second conveying channels respectively, and configuring a controller to execute a two-stage flow regulation strategy of first coarsely adjusting the pump speed and then finely adjusting the bypass valve, the problems of poor mixing accuracy and insufficient system stability caused by the lag in hydraulic motor response and repeated speed fluctuations in the existing single pump control scheme are solved. Specifically, the solution pump coarse adjustment stage quickly establishes the basic output of the main flow rate, and the bypass valve fine adjustment stage uses a high-response valve to accurately correct the flow deviation, achieving high-precision mixing without repeatedly adjusting the pump speed, significantly improving the stability of the mixing ratio and the system response speed. Furthermore, this system structure can be adapted to the special operational requirements of sequential mixing and coagulation reaction of two-component solutions, filling the technical gap in existing foam proportioning mixing systems in this application field.

[0026] Other advantages of this application and the technical effects of preferred embodiments will be further described in the detailed embodiments below. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a schematic diagram of the structure of a vehicle-mounted solidifying fire extinguishing agent proportioning control system in one embodiment; Figure 2 This is a flowchart illustrating the proportional control steps in one embodiment; Figure 3 This is a flowchart illustrating the mixing sequence and spraying operation steps in one embodiment; Figure 4 This is a flowchart illustrating the steps for controlling the mixing ratio accuracy of a two-component solution in one embodiment. Figure 5 This is a flowchart illustrating the logic protection step for injecting the second component solution in one embodiment; Figure 6 This is a flowchart illustrating the air compressor protection logic steps in one embodiment; Figure 7 This is a schematic flowchart of the two-component solution dispensing step in one embodiment.

[0029] The following are the labeling elements in the figure: 101-Water tank; 102-First delivery valve; 103-First flow meter; 104-First solution pump; 105-First bypass regulating valve; 106-First tank filling valve; 107-First container tank; 108-First tank supply valve; 109-Second flow meter; 110-Second solution pump; 111-Second bypass regulating valve; 112-Second tank filling valve; 113-Second container tank; 114-Second tank supply valve; 115-Air compressor system; 116-Fire extinguishing agent outlet valve; 117-Air regulating valve; 118-Condensing fire extinguishing agent mixing device; 119-Second delivery valve; 120-Pressure sensor; 121-Water flow regulating valve; 122-Water flow meter; 123-Water pump; 124-Tank water supply valve; 201-Operating panel; 202-Controller. Detailed Implementation

[0030] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application.

[0031] Furthermore, the terms "first," "second," "third," and "fourth" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first," "second," "third," or "fourth" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0032] It should be understood that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0033] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or a signal connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0034] The following section will describe in detail the vehicle-mounted solidifying fire extinguishing agent proportioning control system, control method, and fire truck of this application, with reference to the accompanying drawings. Figure 1 This application illustrates the system architecture of a basic embodiment; Figure 2 The structural details of the proportional control device are shown; Figures 3 to 7 These correspond to flowchart diagrams of each step in the method described in this application.

[0035] It should be noted that the solidifying fire extinguishing agent described in this application refers to a solidifying fire-fighting material generated by mixing a first component solution and a second component solution with water in a specific ratio, followed by foaming with compressed air. This solidifying fire extinguishing agent has a fast solidification speed, high fire extinguishing efficiency, good flame retardant properties, and long adhesion time, integrating multiple effects such as fire extinguishing, heat insulation, and flame retardancy. It is particularly suitable for extinguishing Class A and B fires in forest fires and for quickly establishing flame-retardant firebreaks.

[0036] Optionally, the first component solution corresponds to Class A foam liquid, mainly used for extinguishing Class A fires (fires involving solid materials such as wood, paper, cotton, and linen), and the second component solution corresponds to Class B foam liquid, mainly used for extinguishing Class B fires (fires involving liquids or fusible solids such as gasoline, diesel, alcohol, and paraffin). When the two components are mixed, a solidification reaction occurs, forming a solidified fire-fighting material with a specific form.

[0037] The term "tank supply" as used in this application refers to a liquid supply mode in which the medium (water, first component solution, or second component solution) is drawn from a container (water tank, first container, or second container); "external suction" refers to a liquid supply mode in which the medium is drawn from an external water source or an external solution source.

[0038] by Figure 1 and Figure 2 Taking this application as an example, we will explain and introduce a vehicle-mounted solidifying fire extinguishing agent proportioning control system.

[0039] This application provides a vehicle-mounted solidifying fire extinguishing agent proportioning control system, including a first conveying channel for conveying a first component solution, a second conveying channel for conveying a second component solution, a third conveying channel for conveying water, a compressed air input pipeline, at least one fire extinguishing agent output pipeline, and a controller 202.

[0040] The system includes a first conveying channel for conveying the first component solution from the first container 107 to the solidifying extinguishing agent mixing device 118; a second conveying channel for conveying the second component solution from the second container 113 to the solidifying extinguishing agent mixing device 118; a third conveying channel for conveying water from the water tank 101 to the solidifying extinguishing agent mixing device 118; and a compressed air input pipeline for conveying compressed air generated by the air compressor system 115 to the solidifying extinguishing agent mixing device 118. The first and second component solutions, after mixing with water and foaming in the solidifying extinguishing agent mixing device 118, undergo a solidification reaction to generate a solidifying extinguishing agent, which is then sprayed outwards through the extinguishing agent output pipeline.

[0041] The controller 202, as the control core of the system, is connected to various pumps, valves, flow meters, and sensors in the system. It receives feedback signals and sends control commands to each actuator according to preset logic, thereby achieving closed-loop control of the extinguishing agent mixing and spraying process. It should be noted that the term "signal connection" in this application encompasses various connection methods, such as electrical connections and communication connections implemented via wired or wireless means, that can be used to transmit control signals or feedback signals.

[0042] Please see Figure 1 In one embodiment, a first container 107, a first container supply valve 108, a first solution pump 104, a first flow meter 103, and a first delivery valve 102 are sequentially arranged along the conveying direction on the first conveying channel. The first container 107 stores the first component solution; the first container supply valve 108 is located between the outlet of the first container 107 and the inlet of the first solution pump 104, and is used to control the flow of liquid from the first container 107. The first solution pump 104 serves as the power source for the first conveying channel, drawing the first component solution from the first container 107 or an external solution source and delivering it outwards at a certain pressure; the drive motor of the first solution pump 104 is signal-connected to a controller 202, which controls the output flow rate of the first solution pump 104 by adjusting the speed of the drive motor. The first flow meter 103 is used to detect the actual flow rate of the first component solution in real time and feeds the flow signal back to the controller 202. The first flow meter 103 is located between the outlet of the first solution pump 104 and the inlet of the main channel of the mixed liquid, ensuring that the flow rate it detects is the actual output flow rate after bypass adjustment. The first delivery valve 102 is an electrically controlled valve, which is signal-connected to the controller 202 and is used to control the on / off injection of the first component solution into the solidification extinguishing agent mixing device 118. It is located downstream of the first flow meter 103.

[0043] A first flow regulation component is also provided on the first delivery channel. The first flow regulation component includes a first solution pump 104 and a first reflux bypass connected in parallel with the first solution pump 104. Specifically, the inlet end of the first reflux bypass is connected between the outlet of the first solution pump 104 and the first flow meter 103, and the outlet end of the first reflux bypass is connected between the first tank supply valve 108 and the inlet of the first solution pump 104. A first bypass regulating valve 105 is provided on the first reflux bypass, and the first bypass regulating valve 105 is signal-connected to the controller 202. The controller 202 controls the flow rate of the solution returning to the pump inlet via the bypass by adjusting its opening degree, thereby fine-tuning the output flow rate of the main line. By connecting the bypass outlet end to the pump inlet side, the solution returned by the bypass is directly returned to the pump suction end, avoiding disturbance of the tank by the return flow, while maintaining the continuity of the liquid supply at the pump inlet end.

[0044] In one embodiment, a first external suction port is provided between the first tank supply valve 108 and the outlet end of the first reflux bypass. The first solution pump 104 is configured to draw the first component solution from the first tank 107 through the first tank supply valve 108, or to draw and supply solution externally through the first external suction port. The first tank supply valve 108 can be a manual or electrically controlled three-way switching valve, and the operator can select the tank supply mode or the external suction mode according to the working scenario; in the tank supply mode, the first tank supply valve 108 opens the flow channel between the first tank 107 and the inlet of the first solution pump 104; in the external suction mode, the external solution source is connected to the inlet of the first solution pump 104 through the first external suction port, and the first solution pump 104 draws solution from the external solution source.

[0045] In one embodiment, a third reflux bypass is also provided on the first conveying channel. The inlet end of the third reflux bypass is connected between the inlet end of the first reflux bypass and the first flow meter 103, and the outlet end of the third reflux bypass is connected to the first container 107. A first container filling valve 106 is provided on the third reflux bypass. The first container filling valve 106 is signal-connected to the controller 202 and is used to reverse the flow of the first component solution back to the first container 107 in the filling mode. It should be noted that in this application, the reflux path where the first container filling valve 106 is located is named the third reflux bypass to distinguish it from the first reflux bypass used for flow regulation and to avoid confusion. The two have different functions: the first reflux bypass is used to fine-tune the solution flow rate during the spraying operation, while the third reflux bypass is used to fill the container with solution in the non-spraying state.

[0046] Please continue reading. Figure 1 In one embodiment, a water tank 101, a tank water supply valve 124, a water pump 123, a water flow meter 122, and a water flow regulating valve 121 are sequentially arranged along the conveying direction on the third conveying channel.

[0047] Water tank 101 is used to store water. A water supply valve 124 is located between the outlet of water tank 101 and the inlet of water pump 123, used to control the water supply to water tank 101. Water pump 123 serves as the power source for the third conveying channel, used to draw water from water tank 101 or an external water source and convey it outwards at a certain pressure. Water pump 123 is signal-connected to controller 202, which regulates the water flow rate by controlling the start / stop and speed of water pump 123. A water flow meter 122 is used to detect the actual water flow rate in real time and feeds the flow signal back to controller 202. The water flow meter 122 is located between the outlet of water pump 123 and the inlet of the main mixing channel. A water flow regulating valve 121 is an electrically controlled valve, signal-connected to controller 202, used to precisely regulate the water flow rate entering the main mixing channel, and is located downstream of water flow meter 122.

[0048] An external water suction port is also provided between the tank water supply valve 124 and the inlet of the water pump 123. The water pump 123 is configured to draw water from the water tank 101 through the tank water supply valve 124, or to supply water externally through the external water suction port. The tank water supply valve 124 can be a manual or electrically controlled three-way switching valve, used to switch between tank supply and external suction water supply modes.

[0049] Please continue reading. Figure 1 In one embodiment, the ends of the first and third conveying channels merge to form a main mixing channel. This merging refers to the physical intersection of the first component solution pipeline and the water pipeline, allowing the first component solution and water to initially mix in the main mixing channel to form a mixture. The main mixing channel is equipped with branch mixing channels corresponding to the number of extinguishing agent output pipelines. Each branch mixing channel is connected to a solidifying extinguishing agent mixing device 118 on the corresponding extinguishing agent output pipeline. Thus, after the mixture of water and the first component solution is uniformly conveyed through the main mixing channel, it is distributed to the various branch mixing channels and enters the corresponding solidifying extinguishing agent mixing devices 118.

[0050] In one embodiment, the system further includes a pressure sensor 120 connected to the controller 202 via a signal. The pressure sensor 120 is located on the main channel of the mixture. The pressure sensor 120 is used to monitor the system injection pressure in real time and feeds back the pressure signal to the controller 202 as a basis for the second component solution injection protection and system pressure regulation.

[0051] Please continue reading. Figure 1 In one embodiment, the second delivery channel includes a main channel for the second component solution and branch channels for the second component solution corresponding to the number of extinguishing agent output pipelines branching off from the main channel. Each branch channel is connected to a solidifying extinguishing agent mixing device 118 on the corresponding extinguishing agent output pipeline, and each branch channel is equipped with a second delivery valve 119. The second delivery valve 119 is signal-connected to the controller 202 and is used to independently control the injection and shut-off of the second component solution on each output pipeline. It should be noted that the second component solution differs from the mode where water and the first component solution are pre-combined and then diverted in the main channel. Instead, it is directly delivered to each branch channel through an independent main channel, and only in the final stage of the solidifying extinguishing agent mixing device 118 does it combine with the mixed liquid and compressed air. This structure ensures that the second component solution does not come into premature contact with the mixed liquid before entering the mixing chamber, thereby avoiding unintended solidification reactions in the pipeline.

[0052] In one embodiment, a second container 113, a second container supply valve 114, a second solution pump 110, and a second flow meter 109 are sequentially arranged along the conveying direction on the main channel of the second component solution.

[0053] The second container 113 is used to store the second component solution. A second container supply valve 114 is located between the outlet of the second container 113 and the inlet of the second solution pump 110, used to control the supply of liquid to the second container 113. The second solution pump 110 serves as the power source for the second delivery channel and is signal-connected to the controller 202. The controller 202 controls the output flow rate by adjusting the speed of the drive motor of the second solution pump 110. A second flow meter 109 is used to detect the actual flow rate of the second component solution in real time and feeds the flow signal back to the controller 202. The second flow meter 109 is located between the outlet of the second solution pump 110 and the inlet of the main channel of the second component solution, ensuring that the flow rate it detects is the actual output flow rate after bypass adjustment.

[0054] A second flow regulation component is also provided on the second delivery channel. The second flow regulation component includes a second solution pump 110 and a second reflux bypass connected in parallel with the second solution pump 110. Specifically, the inlet end of the second reflux bypass is connected between the outlet of the second solution pump 110 and the second flow meter 109, and the outlet end of the second reflux bypass is connected between the second tank supply valve 114 and the inlet of the second solution pump 110. A second bypass regulating valve 111 is provided on the second reflux bypass. The second bypass regulating valve 111 is signal-connected to the controller 202, and its flow fine-tuning function is the same as that of the first bypass regulating valve 105.

[0055] In one embodiment, a second external suction port is provided between the second tank supply valve 114 and the outlet end of the second reflux bypass. The second solution pump 110 is configured to draw the second component solution from the second tank 113 through the second tank supply valve 114, or to perform external suction supply through the second external suction port, and the switching method is the same as the external suction structure of the first delivery channel.

[0056] In one embodiment, a fourth reflux bypass is also provided on the main channel of the second component solution. The inlet end of the fourth reflux bypass is connected between the inlet end of the second reflux bypass and the second flow meter 109, and the outlet end of the fourth reflux bypass is connected to the second container 113. A second tank filling valve 112 is provided on the fourth reflux bypass and is signal-connected to the controller 202 for reversing the flow of the second component solution back to the second container 113 in filling mode. Consistent with the naming convention of the third reflux bypass, it is named the fourth reflux bypass here to distinguish it from the second reflux bypass used for flow regulation.

[0057] Please continue reading. Figure 1In one embodiment, the compressed air input pipeline includes a main compressed air duct and compressed air branches branching off from the main compressed air duct, corresponding to the number of extinguishing agent output pipelines. Each compressed air branch is connected to a solidifying extinguishing agent mixing device 118 of its corresponding extinguishing agent output pipeline, and each compressed air branch is equipped with an air regulating valve 117. The air regulating valve 117 is signal-connected to the controller 202 and is used to independently control the injection flow rate or on / off state of the compressed air on each output pipeline. The inlet end of the main compressed air duct is connected to an air compressor system 115, which generates compressed air. In a specific implementation, the air compressor system 115 may include an air compressor, an air tank, and a matching control valve assembly. The start / stop of the air compressor and the control of the valve assembly can be uniformly regulated by the controller 202.

[0058] Please continue reading. Figure 1 In one embodiment, each extinguishing agent output pipeline is connected to the aforementioned channels via a solidifying extinguishing agent mixing device 118. The solidifying extinguishing agent mixing device 118 is a key component for the final mixing and foaming of the solidifying extinguishing agent. It contains multiple mixing chambers, with inlets connected to a mixed liquid branch (from a mixture of water and the first component solution), a second component solution branch (from the main second component solution channel), and a compressed air branch (from the main compressed air channel). Within the solidifying extinguishing agent mixing device 118, the mixed liquid first mixes with compressed air to form a foam mixture, and then mixes with the second component solution to undergo a solidification reaction, generating the solidifying extinguishing agent. The outlet end of the solidifying extinguishing agent mixing device 118 is connected to an extinguishing agent outlet valve 116, which is signal-connected to a controller 202 to control the spraying on / off of this output pipeline. According to the actual configuration requirements of the fire truck, the extinguishing agent output pipeline can be set to multiple lines, each corresponding to a different spray terminal, such as left gun, right gun, roof-mounted cannon and front cannon, etc. The structure of each output pipeline is the same, consisting of a corresponding mixed liquid branch, a second component solution branch, a compressed air branch, a solidified extinguishing agent mixing device 118 and an extinguishing agent outlet valve 116. The controller 202 can independently control each line.

[0059] Please see Figure 1 and Figure 2In one embodiment, the system further includes an operation panel 201. The operation panel 201 is electrically connected to the controller 202 and is used to input operation commands and display system operating parameters. Operators can use the operation panel 201 to set parameters such as the mixing ratio of water and each component solution, target water flow rate, and spray outlet selection, and control the system using various operation commands provided by the operation panel 201 (including operation commands for the water pump, solution pump, air compressor system, and various valves). The operation panel 201 is also used to display operating parameters such as water flow rate, flow rate of each component solution, system pressure, and actual mixing ratio in real time, facilitating operator monitoring of the system status. In one embodiment, the operation panel 201 provides a one-button operation command; after the operator triggers the command, the controller 202 automatically starts the supply of each medium and executes spraying according to a preset logical sequence.

[0060] It is understood that the controller 202 is connected to the drive motors of the first solution pump 104 and the second solution pump 110, the first bypass regulating valve 105, the second bypass regulating valve 111, the water flow regulating valve 121, the air regulating valve 117, the first delivery valve 102, the second delivery valve 119, the extinguishing agent outlet valve 116, the water flow meter 122, the first flow meter 103, the second flow meter 109, the pressure sensor 120, the operation panel 201, and the first tank filling valve 106 and the second tank filling valve 112. The controller 202 can specifically be a control device with logic operation and signal processing capabilities, such as a PLC, an embedded microprocessor, or an industrial control computer.

[0061] At the signal interaction level, such as Figure 2 As shown, the controller 202 is configured to receive real-time flow signals from the water flow meter 122, the first flow meter 103, and the second flow meter 109, receive system pressure signals from the pressure sensor 120, and receive operation commands and parameter setting signals from the operation panel 201. At the control output level, controller 202 is configured to send speed adjustment signals to the drive motors of the first solution pump 104 and the second solution pump 110 to perform coarse flow adjustment; send opening adjustment signals to the first bypass regulating valve 105 and the second bypass regulating valve 111 to perform fine flow adjustment; send start / stop or speed adjustment signals to the water pump 123 to control water flow; send opening adjustment signals to the water flow regulating valve 121 to precisely control water flow; send opening adjustment signals to the air regulating valve 117 to control the amount of compressed air injected; send on / off control signals to the first delivery valve 102, the second delivery valve 119 and the extinguishing agent outlet valve 116 to control the on / off of each pipeline; and send on / off control signals to the first canister filling valve 106 and the second canister filling valve 112 to control the filling operation.

[0062] In one embodiment, this application also provides a fire truck equipped with a vehicle-mounted solidifying extinguishing agent proportioning control system as described in any of the preceding embodiments. The fire truck chassis is equipped with a water tank 101, a first container 107, and a second container 113, for storing water, a first component solution, and a second component solution, respectively. A water pump 123, a first solution pump 104, a second solution pump 110, and an air compressor system 115 can be installed in the fire truck's pump room. A controller 202 and an operation panel 201 can be installed in the fire truck's cab or on the pump room's operation panel. A solidifying extinguishing agent mixing device 118 and an extinguishing agent outlet valve 116 can be installed on the top or side of the fire truck and connected to the corresponding spray terminal.

[0063] Based on the same inventive concept, this application also provides a method for controlling the proportion of vehicle-mounted solidifying fire extinguishing agents, applicable to the system described in any of the above embodiments. It should be noted that the controller 202 in the aforementioned system is the executing entity for each step of the method described below. The controller 202 automatically controls each step by executing the computer program stored in its memory, combined with signals from various sensors and instructions issued by the operation panel 201.

[0064] In one basic embodiment, the method includes the following steps: 1. Spray Preparation. Before sequentially activating the supply of each medium, the controller 202 receives the spray parameters input by the operator through the operation panel 201, including the preset mixing ratio, target water flow rate, and the selected extinguishing agent output pipeline (e.g., left nozzle, right nozzle, roof-mounted nozzle, or front nozzle). Regarding the liquid supply mode selection, the operator determines the water supply mode and the liquid supply mode: if the tank supply mode is selected, the corresponding tank water supply valve 124, the first tank supply valve 108, and the second tank supply valve 114 are opened manually or automatically by the controller 202; if the external suction mode is selected, the external suction pipeline is connected and the corresponding external suction valve is opened. The controller 202 opens the corresponding extinguishing agent outlet valve 116 according to the extinguishing agent output pipeline selected by the operator, completing the spray preparation.

[0065] 2. Sequentially start the supply of water, the first component solution, and compressed air. After the preparation is complete, controller 202 will automatically execute the following startup operations in a preset sequence: First, the water flow regulating valve 121 is opened, and the water pump 123 is started, allowing water to enter the main channel of the mixed liquid through the third conveying channel. The water flow meter 122 detects the actual water flow in real time and feeds it back to the controller 202. The controller 202 performs closed-loop regulation of the water flow based on the deviation between the preset target water flow and the actual water flow by adjusting the speed of the water pump 123 and / or the opening of the water flow regulating valve 121.

[0066] Next, the first solution pump 104 is started and the first delivery valve 102 is opened in conjunction, allowing the first component solution to enter the main channel of the mixture through the first delivery channel and merge with water to form a mixture. Simultaneously with the start of the first solution pump 104, two-stage flow regulation for the first component solution is performed (see below for details).

[0067] Then, after confirming that the first component solution has an actual flow output, the air compressor system 115 is started. Compressed air enters each compressed air branch through the compressed air input pipeline, and the corresponding air regulating valve 117 is kept open. The compressed air enters the solidification extinguishing agent mixing device 118, meets the mixed liquid from the mixed liquid branch and foams to form a foam mixture.

[0068] 3. When the system pressure reaches the preset protection threshold, the supply of the second component solution is initiated. Pressure sensor 120 monitors the system pressure on the main mixing channel in real time and feeds it back to controller 202. When controller 202 detects that the system pressure has reached or exceeded the preset protection threshold, it automatically starts the second solution pump 110 and simultaneously opens the second delivery valve 119 on the corresponding output pipeline. The second component solution enters the solidifying extinguishing agent mixing device 118 through the main and branch channels of the second component solution. After mixing with the foam mixture, a solidification reaction occurs, generating a solidifying extinguishing agent, which is then sprayed outwards through the extinguishing agent outlet valve 116. Simultaneously with starting the second solution pump 110, two-stage flow regulation for the second component solution is performed (see below for details). The aforementioned preset protection threshold is determined based on the type of spray terminal and rated operating pressure of the extinguishing agent output pipeline, ensuring that the system has sufficient spray pressure to promptly discharge the mixed solidifying extinguishing agent when the second component solution is injected, preventing unexpected solidification in the pipeline and subsequent blockage.

[0069] 4. After spraying ends, the supply of each medium is shut off in reverse order. When the controller 202 receives a spraying end command from the operator via the control panel 201 or detects other preset shutdown conditions, it shuts off each medium supply in the reverse order of startup: first, it shuts off the second solution pump 110 and simultaneously closes the second delivery valve 119; then, it shuts off the air compressor system 115; finally, it shuts off the first solution pump 104 and the first delivery valve 102, and closes the water pump 123 and the water flow regulating valve 121. This reverse-sequence shutdown ensures that after the supply of the second component solution stops, the mixture and compressed air can continue to flush the pipeline for a certain period, discharging any remaining mixture and further reducing the risk of pipeline blockage.

[0070] In a more specific embodiment, see Figure 3 The method may include the following steps: Step 301: Select water supply mode and liquid supply mode. The operator determines the supply method of water, first component solution and second component solution through the control panel or manual operation according to the work site conditions.

[0071] Step 302: If the tank supply mode is selected, open the tank supply water valve, the first tank supply valve and the second tank supply valve so that the water pump, the first solution pump and the second solution pump can draw the medium from the water tank, the first container and the second container respectively.

[0072] Step 303: If the external suction mode is selected, connect the external water source and external solution source pipelines, open the corresponding external suction valve, and perform water and liquid priming operations to allow each pump to draw media from the external source.

[0073] Step 304: Select the extinguishing agent output pipeline. Based on the spraying requirements, the operator selects the corresponding extinguishing agent outlet (e.g., left nozzle, right nozzle, roof-mounted nozzle, or front nozzle) via the control panel, and the controller opens the corresponding extinguishing agent outlet valve.

[0074] Step 305: Start the water supply. The controller opens the water flow regulating valve, starts the water pump, and water enters the main channel of the mixed liquid through the third delivery channel. The water flow meter detects the water flow in real time and sends feedback to the controller.

[0075] Step 306: Start the supply of the first component solution. The controller starts the first solution pump and opens the first delivery valve in conjunction with it. The first component solution enters the main channel of the mixed liquid through the first delivery channel and merges with the water. At this time, two-stage flow regulation for the first component solution is performed simultaneously.

[0076] Step 307: Start the compressed air supply. After the controller confirms that the first component solution has an actual flow rate, it starts the air compressor system. Compressed air enters each compressed air branch through the compressed air input pipeline, and the corresponding air regulating valve remains open.

[0077] Step 308: Start the supply of the second component solution. When the system pressure fed back by the pressure sensor reaches the preset protection threshold, the controller starts the second solution pump and opens the second delivery valve on the corresponding output pipeline. The second component solution enters the mixing chamber through the main channel and branch channels of the second component solution. At this time, two-stage flow regulation for the second component solution is performed simultaneously.

[0078] Step 309: Increase system pressure. The controller adjusts the output of the water pump and each solution pump to increase the system pressure to the rated injection pressure, and the system enters a stable injection state.

[0079] End: After the spraying operation is completed, the controller shuts off the supply of each medium in reverse order of startup, and the system returns to standby mode.

[0080] In one embodiment, the above-mentioned two-stage flow regulation specifically includes the following sub-steps: The controller 202 acquires the actual water flow rate fed back by the water flow meter 122.

[0081] The controller 202 calculates the target flow rate of the corresponding component solution (first component solution or second component solution) based on the actual water flow rate and the mixing ratio preset by the operator. For example, if the preset mixing ratio is that the first component solution accounts for 3% of the water volume, and the current actual water flow rate is 100L / min, then the target flow rate of the first component solution is 3L / min.

[0082] Based on the target flow rate, controller 202 sends a speed adjustment signal to the drive motor of the corresponding solution pump (first solution pump 104 or second solution pump 110) to adjust the speed of the solution pump so that the actual flow rate of the component solution reaches or slightly exceeds the target flow rate, thereby completing the coarse flow rate adjustment. Here, "slightly exceeds" means that the actual flow rate is slightly greater than the target flow rate, so that there is excess flow that can be returned through the bypass when fine-tuning is performed later, thereby achieving precise control of the main output flow rate without reducing the pump speed.

[0083] When the controller 202 detects through the corresponding flow meter (first flow meter 103 or second flow meter 109) that the difference between the actual flow rate and the target flow rate falls within a preset threshold range, it keeps the speed of the corresponding solution pump constant and instead fine-tunes the actual flow rate of the component solution by adjusting the opening of the corresponding parallel bypass valve (first bypass regulating valve 105 or second bypass regulating valve 111). Specifically, when the actual flow rate is slightly higher than the target flow rate, the controller 202 increases the opening of the bypass regulating valve, allowing more solution to return to the pump inlet via the reflux bypass, thereby reducing the main output flow rate to precisely match the target flow rate; when the actual flow rate is slightly lower than the target flow rate, the controller 202 decreases the opening of the bypass regulating valve, allowing less solution to reflux via the bypass, thereby increasing the main output flow rate.

[0084] In one embodiment, the solution pump is driven by a hydraulic motor, whose flow response inherently lags behind that of an electrically controlled valve. The bypass regulating valve, on the other hand, is an electrically controlled valve (such as an electric V-ball valve), whose opening degree has a good linear relationship with flow rate, offering fast response and high control accuracy. By employing a hierarchical control strategy that assigns coarse adjustment to the solution pump and fine adjustment to the bypass regulating valve, the advantages of the hydraulic motor's high torque and high flow rate are leveraged while compensating for its shortcomings in fine adjustment. During the coarse adjustment phase, the pump speed is locked once adjusted to the desired level, and subsequent fine adjustments are only made through the electrically controlled bypass valve. This effectively avoids repeated fluctuations in the hydraulic motor speed, significantly improving the system's response speed and mixing accuracy, while also reducing additional wear on the pump and drive system.

[0085] In a more specific embodiment, during the flow fine-tuning phase, the controller 202 also monitors the magnitude of changes in water flow in real time and adopts different adjustment strategies based on the magnitude of the changes: If the change in water flow is less than the preset value, it indicates a minor disturbance (such as slight fluctuations in water pressure). The controller 202 maintains the corresponding solution pump speed constant and continues to fine-tune by adjusting the opening of the corresponding parallel bypass valve. Since the bypass valve is an electrically controlled valve, its response speed is much faster than that of the hydraulic drive system of the solution pump, and it can quickly correct small flow deviations without the need to start the pump speed adjustment.

[0086] If the change in water flow rate is greater than or equal to the preset value, it indicates a significant change in flow demand (e.g., the operator drastically adjusts the target water flow rate or switches the spray terminal). The original pump speed is no longer able to match the new target flow rate. Controller 202 then readjusts the speed of the corresponding solution pump for coarse adjustment. Once the flow rate returns to the fine-tuning range, it switches to the bypass valve fine-tuning mode. This tiered dynamic adjustment strategy, using a small-disturbance valve and a large-disturbance pump, allows the system to select the optimal adjustment method under different operating conditions, balancing response speed and adjustment accuracy.

[0087] In a more specific embodiment, please refer to Figure 4 The above two-stage flow regulation may include the following steps: Step 310: During the mixing process of the extinguishing agent, the controller obtains the actual water flow rate fed back by the water flow meter, and calculates the target flow rates of the first component solution and the second component solution according to the mixing ratio preset by the operator.

[0088] Step 311: The controller sends a speed adjustment signal to the drive motor of the first solution pump or the second solution pump to adjust the speed of the corresponding solution pump so that it initially reaches the target flow rate calculated in step 310, thus completing the coarse flow rate adjustment.

[0089] Step 312: The controller monitors the change in water flow rate in real time and determines its relationship with the preset value: If the change in water flow rate is greater than or equal to the preset value, it indicates that the water flow conditions have changed significantly and the original conversion benchmark is no longer applicable. Then, return to step 310, recalculate the target flow rate based on the current water flow rate, and readjust the speed of the corresponding solution pump for coarse adjustment; if the change in water flow rate is less than the preset value, it indicates that the current state is under slight disturbance, then proceed to step 313.

[0090] Step 313: The controller detects the actual flow rate of the corresponding component solution in real time through the first flow meter or the second flow meter, and calculates the current actual mixing ratio based on the actual flow rate and the current water flow rate.

[0091] Step 314: The controller compares the actual mixing ratio calculated in step 313 with the preset mixing ratio to evaluate whether the mixing accuracy meets the requirements. If the accuracy meets the requirements, the controller proceeds to the end step to complete the adjustment. If the accuracy does not meet the requirements, the controller proceeds to step 315.

[0092] Step 315: The controller maintains the corresponding solution pump speed constant, and instead sends an opening adjustment signal to the corresponding first or second bypass regulating valve. The solution flow rate is fine-tuned by controlling the opening of the bypass regulating valve. After fine-tuning, the system returns to step 313, re-detects the actual flow rate, and calculates the actual mixing ratio to form a closed-loop regulation until the required accuracy is met.

[0093] End of process: The current mixing ratio accuracy meets the requirements, and this round of adjustment process ends.

[0094] In one embodiment, the method further includes a logic protection step for the injection of a second component solution during the dispensing of the solidifying extinguishing agent: Pressure sensor 120 monitors the system pressure on the main channel of the mixture in real time and feeds back the pressure signal to controller 202.

[0095] The controller 202 assesses whether the current system pressure has reached the preset protection threshold for the injection of the second component solution.

[0096] If the system pressure is greater than or equal to the preset protection threshold, the controller 202 keeps the second solution pump 110 running and the second delivery valve 119 open, and continues to supply the second component solution normally.

[0097] If the system pressure is lower than the preset protection threshold, the controller 202 automatically shuts down the second solution pump 110 and / or the second delivery valve 119, stopping the supply of the second component solution. When the system pressure returns to above the preset protection threshold, the controller 202 restarts the second solution pump 110 and opens the second delivery valve 119, restoring the supply of the second component solution.

[0098] The above-mentioned logic protection steps ensure that the second component solution is injected only when the system has sufficient injection pressure, effectively preventing the risk of pipe blockage caused by insufficient pressure causing the solidifying extinguishing agent to remain and solidify in the pipeline.

[0099] In one specific embodiment, see Figure 5 The logic protection for the injection of the second component solution may include the following steps: Step 316: During the mixing and output of the extinguishing agent, the controller monitors the system spray pressure in real time through a pressure sensor.

[0100] Step 317: The controller makes a judgment based on the system pressure value fed back by the pressure sensor: if the system pressure is greater than or equal to the preset protection threshold, proceed to step 318; if the system pressure is less than the preset protection threshold, proceed to step 319.

[0101] Step 318: The controller maintains or automatically starts the second solution pump and opens the second delivery valve on the corresponding output pipeline, allowing the second component solution to be injected normally into the mixing pipeline, and the system enters the second component solution delivery state.

[0102] Step 319: The controller automatically shuts down the second solution pump and the second delivery valve, prohibiting the continued delivery of the second component solution, and the system enters the state where the delivery of the second component solution is prohibited.

[0103] The above protection logic effectively prevents the second component solution from stagnating in the pipeline due to insufficient system back pressure by binding the supply of the second component solution to the system pressure in real time, thus avoiding pipe blockage caused by premature solidification reaction between the first and second component solutions in the pipeline.

[0104] In one embodiment, the method further includes a logic protection step for the air compressor: Before starting the compressed air supply, the controller 202 detects the actual flow rate of the first component solution via the first flow meter 103. If there is no flow of the first component solution (i.e., the first component solution has not been started or the flow has stopped), the controller 202 prohibits the start of the air compressor system 115. This is because compressed air cannot dissolve in pure water. If there is no first component solution in the mixture, directly injecting compressed air will cause violent fluctuations at the outlet, which may cause the operator to lose control of the nozzle or even be injured.

[0105] During the dispensing of the solidifying extinguishing agent, the controller 202 continuously monitors the actual flow rate of the first component solution. If the actual flow rate of the first component solution is detected to be zero (e.g., due to a malfunction of the first solution pump 104 or depletion of the first container 107), the controller 202 immediately shuts down the air compressor system 115. By logically binding the operation of the air compressor to the flow rate status of the first component solution, the system can effectively prevent the risk of drastic fluctuations in compressed air during the entire operating cycle when there is no solution for foaming.

[0106] In a further embodiment, such as Figure 6 As shown, the logic protection of the above-mentioned air compressor may include the following steps: Step 320: During the mixing process of the extinguishing agent, the controller obtains the actual flow signal of the first component solution in real time through the first flow meter.

[0107] Step 321: The controller evaluates the flow signal of the first component solution to determine whether there is flow of the first component solution in the current pipeline.

[0108] Step 322: If the evaluation result shows that there is a flow rate of the first component solution, the controller determines that the compressed air supply can be started, the air compressor system can start normally or continue to operate, and the system enters the air delivery state.

[0109] Step 323: If the evaluation result is that there is no flow of the first component solution, the controller determines that the compressed air supply must not be started and the air compressor system must not be started; if the air compressor system is already running at this time, the controller will automatically shut it down and the system will enter the air delivery prohibited state.

[0110] The above-mentioned interlock protection logic binds the supply of compressed air to the flow status of the first component solution in real time, which can effectively prevent the direct injection of compressed air when the first component solution (foaming component) is lacking in the mixture. This avoids the outlet pressure from fluctuating drastically because the compressed air cannot dissolve in pure water, thereby preventing the operator from holding the gun unsteadily or being injured as a result.

[0111] In one embodiment, the method further includes a solution filling step for replenishing the solutions to each tank in a non-spraying state: Preparations before refueling. The operator connects the external solution source to the first or second external suction port via pipeline and opens the corresponding external suction valve. Confirm that the first delivery valve 102 or the second delivery valve 119 is in the closed position to prevent the solution from accidentally entering the extinguishing agent injection pipeline during the refueling process.

[0112] The controller 202 receives the filling command issued by the operator through the operation screen 201 and starts the corresponding first solution pump 104 or second solution pump 110.

[0113] The controller 202 opens the corresponding first filling valve 106 or the second filling valve 112 (the first filling valve 106 corresponds to the filling of the first component solution, and the second filling valve 112 corresponds to the filling of the second component solution). The solution pump draws in the external solution through the external suction port and then delivers it to the corresponding first container 107 or the second container 113 through the filling valve.

[0114] When the liquid level in the tank reaches the preset level or the operator manually triggers a stop command, the controller 202 shuts down the corresponding solution pump and filling valve, completing the filling operation. The preset liquid level can be detected by a liquid level sensor (not shown in the figure) installed inside the tank and fed back to the controller 202. This liquid level sensor is connected to the controller 202 via a signal connection.

[0115] Further reading is available. Figure 7 The method for adding the first component solution and the second component solution may include the following steps: Step 324: The operator connects the external solution source to the corresponding first or second external suction port through the pipeline and opens the corresponding external suction valve to complete the pipeline preparation before filling.

[0116] Step 325: The controller receives the filling command issued by the operator through the operation panel and starts the corresponding first solution pump or second solution pump to provide delivery power for filling.

[0117] Step 326: During the refueling process, the controller keeps the first delivery valve or the second delivery valve closed to prevent the solution from accidentally entering the extinguishing agent injection pipeline.

[0118] Step 327: The controller opens the first or second tank filling valve, allowing the solution to be pumped in reverse to the corresponding first or second tank via the solution pump.

[0119] Step 328: The system continuously adds solution to the tank. The operator can manually trigger a stop command to terminate the adding process; or when the liquid level in the tank reaches the preset value, the controller automatically shuts off the corresponding solution pump and tank filling valve, stopping the adding process.

[0120] End of procedure: The refueling operation is complete, and the system returns to standby mode.

[0121] In summary, the vehicle-mounted solidifying extinguishing agent proportioning control system, control method, and fire truck provided in this application effectively overcome the technical defects of traditional single pump control schemes, such as slow response, poor accuracy, and easy speed fluctuations, by constructing a two-stage flow regulation structure with a solution pump and a parallel return bypass on the first and second delivery channels respectively, and by adopting a graded control strategy of coarse adjustment followed by fine adjustment. In specific implementation, for small flow disturbances, the system prioritizes fine adjustment using a high-response-speed electrically controlled bypass valve to avoid frequent adjustments to the solution pump speed; for large flow changes, the system restarts the pump speed for coarse adjustment. This strategy significantly improves the stability of the mixing ratio and the system response speed, while reducing additional wear on the pump and drive system.

[0122] Furthermore, this system features a specific mixing path design that pre-mixes water and the first component solution in the main mixing channel, then foams it with compressed air to form a foam mixture, and finally injects the second component solution under system pressure protection to trigger a solidification reaction. Combined with a multi-path, independently controllable output branch structure, this system fully meets the special process requirements of two-component solidifying fire extinguishing agents for mixing sequence, proportion accuracy, and pipeline anti-clogging. It provides a complete vehicle-mounted operation system solution for scenarios such as forest fire fighting that require high flame-retardant solidifying fire extinguishing agents.

[0123] The deficiencies of the above solutions and the proposed solutions are the result of the inventor's practice and careful research. Therefore, the discovery process of the above problems and the solutions proposed in this disclosure below should be considered as the inventor's contribution to this disclosure.

[0124] Obviously, the above embodiments of this application are merely examples for clear illustration and are not intended to limit the implementation of this application. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the scope of protection of the claims of this application.

Claims

1. A vehicle-mounted solidifying fire extinguishing agent proportioning control system, characterized in that, It includes a first conveying channel for conveying a first component solution and a second conveying channel for conveying a second component solution, wherein the first component solution and the second component solution undergo a coagulation reaction after being mixed; the first conveying channel is provided with a first flow regulating component, and the second conveying channel is provided with a second flow regulating component; The first flow regulating component includes a first solution pump disposed on the first delivery channel and a first reflux bypass disposed in parallel with the first solution pump, wherein a first bypass regulating valve is disposed on the first reflux bypass; and / or, the second flow regulating component includes a second solution pump disposed on the second delivery channel and a second reflux bypass disposed in parallel with the second solution pump, wherein a second bypass regulating valve is disposed on the second reflux bypass. The system also includes a controller configured to first coarsely adjust the solution flow rate by adjusting the rotation speed of the first solution pump or the second solution pump, and then finely adjust the solution flow rate by adjusting the opening degree of the first bypass regulating valve or the second bypass regulating valve.

2. The system according to claim 1, characterized in that, The system also includes a third delivery channel for water delivery, a compressed air input pipeline, and at least one extinguishing agent output pipeline. Each extinguishing agent output pipeline is connected to the first delivery channel, the second delivery channel, the third delivery channel, and the compressed air input pipeline through a mixing chamber. Each extinguishing agent output pipeline is equipped with an extinguishing agent outlet valve that is signal-connected to the controller.

3. The system according to claim 2, characterized in that, The end of the first conveying channel and the end of the third conveying channel merge to form a main channel for the mixed liquid. The main channel for the mixed liquid is provided with mixed liquid branches corresponding to the number of fire extinguishing agent output pipelines. Each mixed liquid branch is connected to the mixing chamber on the corresponding fire extinguishing agent output pipeline.

4. The system according to claim 3, characterized in that, The first conveying channel is provided with a first tank, a first tank supply valve, a first solution pump, a first flow meter, and a first delivery valve arranged sequentially along the conveying direction. The first solution pump, the first flow meter, and the first delivery valve are respectively connected to the controller. The first flow meter and the first delivery valve are located between the outlet of the first solution pump and the inlet of the main channel of the mixed liquid. The inlet end of the first reflux bypass is connected between the outlet of the first solution pump and the first flow meter, and the outlet end of the first reflux bypass is connected between the first tank supply valve and the inlet of the first solution pump.

5. The system according to claim 4, characterized in that, The first conveying channel is also provided with a third reflux bypass. The inlet end of the third reflux bypass is connected between the inlet end of the first reflux bypass and the first flow meter, and the outlet end of the third reflux bypass is connected to the first container. The third reflux bypass is provided with a first tank filling valve for reversing the flow of the first component solution back to the first container.

6. The system according to claim 4, characterized in that, A first external suction port is provided between the first tank supply valve and the outlet end of the first reflux bypass. The first solution pump is configured to draw the first component solution from the first tank through the first tank supply valve, or to draw and supply liquid externally through the first external suction port.

7. The system according to claim 3, characterized in that, The third conveying channel is provided with a water tank, a tank water supply valve, a water pump, a water flow meter, and a water flow regulating valve arranged sequentially along the conveying direction. The water pump, water flow meter, and water flow regulating valve are respectively connected to the controller signal. The water flow meter and water flow regulating valve are located between the outlet of the water pump and the inlet of the main channel of the mixed liquid. An external water suction port is provided between the water supply valve of the tank and the inlet of the water pump. The water pump is configured to draw water from the water tank through the water supply valve or to supply water externally through the external water suction port.

8. The system according to claim 3, characterized in that, The system also includes a pressure sensor that is signal-connected to the controller, and the pressure sensor is located on the main channel of the mixture.

9. The system according to any one of claims 2 to 8, characterized in that, The second delivery channel includes a main channel for the second component solution and branch channels for the second component solution branch channel. The number of the second component solution branch channels corresponds to the number of the extinguishing agent output pipelines. The second component solution branch channel is connected to the mixing chamber of the corresponding extinguishing agent output pipeline. Each second component solution branch channel is equipped with a second delivery valve, and the second delivery valve is signal-connected to the controller.

10. The system according to claim 9, characterized in that, Along the conveying direction, the main channel of the second component solution is provided with a second tank, a second tank supply valve, a second solution pump, and a second flow meter. The second solution pump and the second flow meter are respectively connected to the controller. The second flow meter is located between the outlet of the second solution pump and the inlet of the main channel of the second component solution. The inlet end of the second reflux bypass is connected between the outlet of the second solution pump and the second flow meter, and the outlet end of the second reflux bypass is connected between the second tank supply valve and the inlet of the second solution pump.

11. The system according to claim 10, characterized in that, The main channel of the second component solution is also provided with a fourth reflux bypass. The inlet end of the fourth reflux bypass is connected between the inlet end of the second reflux bypass and the second flow meter, and the outlet end of the fourth reflux bypass is connected to the second container. The fourth reflux bypass is provided with a second tank filling valve for reversing the flow of the second component solution back to the second container.

12. The system according to claim 10, characterized in that, A second external suction port is provided between the second tank supply valve and the outlet end of the second reflux bypass. The second solution pump is configured to draw the second component solution from the second tank through the second tank supply valve, or to draw and supply liquid externally through the second external suction port.

13. The system according to any one of claims 2 to 8, characterized in that, The compressed air input pipeline includes a main compressed air channel and compressed air branches branching off from the main compressed air channel. The number of compressed air branches corresponds to the number of fire extinguishing agent output pipelines. Each compressed air branch is connected to the mixing chamber of the corresponding fire extinguishing agent output pipeline. Each compressed air branch is equipped with an air regulating valve, and the air regulating valve is signal-connected to the controller.

14. A fire truck, characterized in that, It is equipped with a vehicle-mounted solidified fire extinguishing agent proportioning control system as described in any one of claims 1 to 13.

15. A method for controlling the proportion of a vehicle-mounted solidifying fire extinguishing agent, characterized in that, The vehicle-mounted solidifying fire extinguishing agent proportioning control system, as described in any one of claims 1 to 13, comprises: The supply of water, the first component solution, and compressed air is started sequentially to mix the water with the first component solution and create foam to form a foam mixture. In response to the detection that the system pressure has reached a preset protection threshold, the supply of the second component solution is started, the second component solution is injected into the foam mixture, and after mixing, the solidifying fire extinguishing agent is output; Specifically, when starting the supply of the first and second component solutions, two-stage flow regulation is performed: first, the speed of the corresponding solution pump is adjusted for coarse adjustment, and then the opening of the corresponding parallel bypass valve is adjusted for fine adjustment.

16. The method according to claim 15, characterized in that, The two-stage flow regulation includes: Obtain the actual water flow rate; Calculate the target flow rate of the corresponding component solution based on the actual water flow rate and the preset mixing ratio; Adjust the rotational speed of the corresponding solution pump based on the target flow rate to perform a coarse adjustment of the actual flow rate of the component solution; If the difference between the actual flow rate and the target flow rate is detected to be within a preset threshold range, the speed of the solution pump is kept constant, and the actual flow rate of the component solution is finely adjusted by adjusting the opening of the corresponding parallel bypass valve.

17. The method according to claim 16, characterized in that, When the difference between the actual flow rate and the target flow rate is within the preset threshold range, the change in water flow rate is monitored in real time. If the change in water flow rate is less than the preset value, the speed of the solution pump is kept constant, and fine-tuning is continued by adjusting the opening of the corresponding parallel bypass valve. If the change in water flow rate is greater than or equal to the preset value, the speed of the corresponding solution pump is readjusted for coarse adjustment.

18. The method according to claim 15, characterized in that, Before starting the compressed air supply, the method further includes: detecting the actual flow rate of the first component solution; if the actual flow rate of the first component solution is detected to be zero, then starting the compressed air supply is prohibited. And / or, during the process of discharging the solidifying extinguishing agent, the method further includes: detecting the actual flow rate of the first component solution; if the actual flow rate of the first component solution is detected to be zero, then shutting off the compressed air supply.

19. The method according to claim 15, characterized in that, The method further includes the following steps during the dispensing of solidifying extinguishing agent: Real-time monitoring of system stress: If the system pressure is less than the preset protection threshold, the supply of the second component solution is shut off; If the system pressure is greater than or equal to the preset protection threshold, the supply of the second component solution is maintained or restarted.

20. The method according to claim 15, characterized in that, The method further includes: A spray termination command has been detected. Turn off the supply of the second component solution, compressed air, first component solution, and water in reverse order of startup sequence.

21. A controller comprising a memory and a processor, the memory storing a computer program, characterized in that, When the processor executes the computer program, it implements the steps of the method according to any one of claims 15 to 20.

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