Double-medium output fire fighting system, fire fighting truck and control method

Abstract

The invention relates to the technical field of fire-fighting emergency rescue equipment, in particular to a double-medium output fire-fighting system, a fire-fighting truck and a control method. The double-medium output fire fighting system comprises a water tank, a water pump, a fire monitor, a water outlet device, a foam tank, a foam pump and a central controller. An outlet of the water pump is connected with an inlet of the main waterway; an outlet of the main water path is connected with a fire monitor through a monitor barrel water path; a water flow meter and a water pressure sensor are arranged on the main water path; an outlet of the foam main pipe is connected with the water outlet device through a branch pipeline; a foam pump, a foam flow meter and a water outlet foam switch valve are sequentially arranged on the foam main pipe; an inlet of the connecting pipeline is connected with the foam main pipe, an outlet of the connecting pipeline is connected with a gun barrel water way, and an electric control switch valve is arranged on the connecting pipeline. In this way, double-medium synchronous output can be achieved, and the efficiency and reliability of fire rescue are improved.

Description

Technical Field

[0001] This invention relates to the field of fire emergency rescue equipment technology, and more specifically, to a dual-media output fire protection system, a fire truck, and a control method. Background Technology

[0002] In fire emergency rescue scenarios, water and foam are two core fire extinguishing media: water primarily extinguishes fires through cooling, while foam, through covering and suffocation, has an irreplaceable fire extinguishing effect on special fires such as oil and chemical fires (Class B fires). With the increasing sophistication of rescue needs, existing fire truck pump control systems have the following key technical deficiencies: Lack of dual-media output capability: Traditional fire trucks mostly adopt a single-media time-sharing output mode, that is, the same outlet can only output water or foam alone, and cannot achieve simultaneous output of dual media such as water and foam at the same time. This results in the need to frequently switch media when dealing with complex fires (such as local oil fires and surrounding solid fires coexisting), which delays the opportunity to extinguish the fire. Summary of the Invention

[0003] The objectives of this invention include, for example, providing a dual-media output fire protection system, fire truck, and control method that can achieve simultaneous output of dual media to improve the efficiency and reliability of fire rescue.

[0004] The embodiments of the present invention can be implemented as follows: In a first aspect, the present invention provides a dual-media output fire protection system, comprising: Water tanks, water pumps, fire monitors, water outlet devices, foam tanks, foam pumps, and central controllers; The inlet of the water pump is connected to the water tank, and the outlet of the water pump is connected to the inlet of the main water circuit; the outlet of the main water circuit is connected to the fire monitor through the cannon pipe water circuit, and connected to the outlet device through the branch water circuit; a water flow meter and a water pressure sensor are installed on the main water circuit. The outlet of the foam tank is connected to the inlet of the foam main pipe, and the outlet of the foam main pipe is connected to the outlet device through a branch pipe; from the foam tank to the branch pipe, the foam main pipe is equipped with a foam pump, a foam flow meter, and an outlet foam switch valve in sequence; a foam pressure sensor is installed on the foam main pipe and / or the branch pipe. The inlet of the connecting pipe is connected to the main foam pipe, the outlet of the connecting pipe is connected to the water circuit of the gun barrel, and an electrically controlled switch valve is installed on the connecting pipe; The central controller is electrically connected to the water flow meter, the water pressure sensor, the foam pump, the foam flow meter, the outlet foam switch valve, the foam pressure sensor, and the electrically controlled switch valve.

[0005] In an optional embodiment, the outlet device includes an outlet pipe and an injection device, wherein the outlet of the branch pipe is connected to the outlet pipe via the injection device; the injection device is configured to adjust the proportion of foam entering the outlet pipe from the branch pipe.

[0006] In an optional embodiment, the injection device has a proportioning mechanism; the proportioning mechanism is configured to adjust the ratio of foam and water in the mixture of the outlet pipe, and the proportioning mechanism has multiple settings, with different foam ratios in the mixture at different settings.

[0007] In an optional embodiment, a drive motor is also included, with the foam pump being driven by the drive motor; the drive motor is configured to adjust the pumping flow rate and pumping pressure of the foam pump by adjusting the rotational speed of the drive motor itself.

[0008] In an optional embodiment, it further includes a power pump and a side power take-off; the power pump is driven by the drive motor through the side power take-off. The foam tank is equipped with a low-level switch that is electrically connected to the central controller. The low-level switch is configured to send a signal to the central controller when it detects that the liquid level in the foam tank is lower than a preset level, so that the power pump or the side power take-off cuts off the power transmitted to the drive motor.

[0009] In an optional embodiment, a flushing pipeline and a flushing valve are also included; one end of the flushing pipeline is connected to the water tank and the other end is connected to the foam main pipe; and the flushing pipeline is located at the connection point of the foam main pipe, between the foam pump and the foam tank; the flushing valve is located on the flushing pipeline.

[0010] In an optional embodiment, it further includes an external foam suction connector and a discharge valve; from the direction of the foam tank to the branch pipeline, the discharge valve and the external foam suction connector are sequentially arranged on the main foam pipe; and the discharge valve and the external foam suction connector are both located between the connection point of the flushing pipeline and the foam tank.

[0011] In an optional embodiment, it further includes a foam inlet pipeline and an injection valve; one end of the foam inlet pipeline is connected to the foam tank, and the other end is connected to the foam main pipe; the foam inlet pipeline is disposed at the connection of the foam main pipe, located between the foam flow meter and the foam pump; And / or, it also includes a foam outlet interface; the foam outlet interface is disposed on the foam main pipe; and the foam outlet interface is located between the connection point of the foam inlet pipe disposed on the foam main pipe and the foam flow meter.

[0012] Secondly, the present invention provides a fire truck, the fire truck comprising the dual-media output fire-fighting system described in any of the foregoing embodiments.

[0013] Thirdly, the present invention provides a control method based on the dual-media output fire protection system described in any of the foregoing embodiments; The control method includes at least the following steps: The central controller collects the water pressure value P1 in real time through the water pressure sensor and the foam pressure value P2 through the foam pressure sensor; the central controller adjusts the speed of the foam pump to keep P2 greater than P1. Close the electronically controlled switch valve, open the outlet foam switch valve, and inject foam from the foam main pipe into the outlet device through the branch pipe at a preset ratio. The outlet device adjusts the preset ratio of the foam. And / or, open the electronically controlled switch valve, close the outlet foam switch valve, and inject foam from the foam main pipe into the outlet device through the cannon pipe water circuit at a preset ratio, with the electronically controlled switch valve adjusting the preset ratio of the foam.

[0014] The beneficial effects of the embodiments of the present invention include, for example: This dual-media fire suppression system comprises a water tank, water pump, fire monitor, outlet devices, foam tank, foam pump, and central controller. Water from the water tank is pumped and then flows through the monitor pipes to the fire monitor and through branch lines to the outlet devices. Foam from the foam tank can flow through branch lines to the outlet devices to mix with water, and the outlet devices can adjust the foam-to-water ratio. Alternatively, it can flow through connecting lines to the fire monitor to mix with water in another direction, and the electrically controlled valves on the connecting lines can adjust the foam-to-water ratio. This achieves simultaneous water-foam dual-media output, providing both cooling and suffocation effects in complex fires (such as scenarios where oil and solid fires coexist) without the need to switch media. By employing a water flow meter, water pressure sensor, foam flow meter, and foam pressure sensor in synergy, this system ensures precise control of the foam ratio and monitors both water and foam pressure. This guarantees that the water pressure exceeds the foam pressure, fundamentally preventing backpressure from blocking foam injection (i.e., excessive water pressure causing water to enter the foam pipeline and block the foam liquid output; the same applies below, and will not be elaborated further). In summary, this dual-media output fire suppression system achieves synchronous water-foam dual-media output, improving upon existing systems' problems of inaccurate foam ratios, poor pressure coordination, and easy contamination of the raw material. It is suitable for complex fire emergency rescue, enhancing fire extinguishing efficiency and system reliability. Attached Figure Description

[0015] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a structural frame diagram of a dual-media output fire protection system according to an embodiment of the present invention; Figure 2 This is a flowchart of the control method for a dual-media output fire protection system according to an embodiment of the present invention.

[0017] Icons: 11-Water tank; 12-Water pump; 13-Fire monitor; 14-Outlet device; 14a-Outlet pipe; 14b-Injection device; 15-Foam tank; 16-Foam pump; 110-Main water circuit; 111-Flow meter; 112-Water pressure sensor; 120-Branch water circuit; 130-Monitor pipe water circuit; 210-Main foam pipe; 220-Branch pipe; 231-Foam flow meter; 232-Foam pressure sensor; 233-Outlet foam switch valve; 234-External foam suction connector; 235-Foam liquid outlet interface; 236-Discharge valve; 240-Foam liquid inlet pipe; 241-Injection valve; 310-Connecting pipe; 311-Electrically controlled switch valve; 410-Drive motor; 420-Power pump; 430-Side power take-off; 510-Flushing pipe; 511-Flushing valve. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0019] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0020] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0021] In the description of this invention, it should be noted that if terms such as "upper," "lower," "inner," or "outer" are used to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of this invention is usually placed, they are only for the convenience of describing this invention 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, and therefore should not be construed as a limitation of this invention.

[0022] Furthermore, the terms "first" and "second" are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0023] It should be noted that, where there is no conflict, the features in the embodiments of the present invention can be combined with each other.

[0024] Please refer to Figure 1 This embodiment provides a dual-media output fire suppression system, including: Water tank 11, water pump 12, fire monitor 13, water outlet device 14, foam tank 15, foam pump 16 and central controller; The inlet of water pump 12 is connected to water tank 11, and the outlet of water pump 12 is connected to the inlet of main water passage 110; the outlet of main water passage 110 is connected to fire monitor 13 through monitor pipe water passage 130, and connected to water outlet device 14 through branch water passage 120; water flow meter 111 and water pressure sensor 112 are installed on main water passage 110. The outlet of foam tank 15 is connected to the inlet of foam main pipe 210, and the outlet of foam main pipe 210 is connected to outlet device 14 through branch pipe 220. From foam tank 15 to branch pipe 220, foam pump 16, foam flow meter 231 and outlet foam switch valve 233 are installed on foam main pipe 210 in sequence. Foam pressure sensor 232 is installed on foam main pipe 210 and / or branch pipe 220. The inlet of the connecting pipe 310 is connected to the foam main pipe 210, the outlet of the connecting pipe 310 is connected to the water passage 130 of the gun barrel, and an electrically controlled switch valve 311 is installed on the connecting pipe 310. The central controller is electrically connected to the water flow meter 111, the water pressure sensor 112, the foam pump 16, the foam flow meter 231, the outlet foam switch valve 233, the foam pressure sensor 232, and the electrically controlled switch valve 311.

[0025] This dual-media fire suppression system features water from water tank 11, pumped by pump 12, flowing through a monitor pipe into fire monitor 13 and through branch water lines 120 into outlet device 14. Foam from foam tank 15 flows through branch lines 220 into outlet device 14 to mix with water, with outlet device 14 allowing adjustment of the foam-to-water ratio. Alternatively, foam flows through connecting pipe 310 into fire monitor 13 for another route of foam-water mixing, with an electrically controlled valve 311 on connecting pipe 310 adjusting the foam-to-water ratio. This simultaneous water-foam dual-media output allows for simultaneous cooling and suffocation in complex fires (such as those involving both oil and solid fires) without the need for media switching. It should be noted that the foam mixture entering outlet device 14 can be easily connected to other pipelines for transport and fire suppression operations, while the foam mixture entering fire monitor 13 can be directly used for fire suppression operations at heights.

[0026] By coordinating the water flow meter 111, water pressure sensor 112, foam flow meter 231, and foam pressure sensor 232, precise control of the foam ratio can be ensured. Simultaneously, both water and foam pressures can be monitored to guarantee that the water pressure is greater than the foam pressure. This fundamentally avoids the phenomenon of water back pressure blocking foam injection (i.e., excessive water pressure causing water to enter the foam pipeline and block the output of foam liquid, the same applies below, and will not be elaborated further). In summary, this dual-media output fire protection system can achieve synchronous output of water and foam, improving the problems of inaccurate foam ratio, poor pressure coordination, and easy contamination of the raw liquid in existing systems. It is suitable for complex fire emergency rescue, improving fire extinguishing efficiency and system reliability.

[0027] from Figure 1 As can be seen from the diagram, the dual-media output fire suppression system in this embodiment has two outlet devices 14 and two foam tanks 15. The two outlet devices 14 are connected to the main waterway 110 through their respective branch waterways 120. Both foam tanks 15 are connected to the foam main pipe 210. A cannon discharge valve 236 is still installed on the cannon pipe waterway 130. A rear inlet valve and multiple suction ports are still installed on the main waterway 110. Multiple external water inlets are also installed on the water tank 11.

[0028] In an optional embodiment, the outlet device 14 includes an outlet pipe 14a and an injection device 14b, with the outlet of the branch pipe 220 connected to the outlet pipe 14a via the injection device 14b; the injection device 14b is configured to adjust the proportion of foam entering the outlet pipe 14a from the branch pipe 220. Thus, the proportion of foam in the water path can be flexibly adjusted via the injection device 14b.

[0029] Specifically, each outlet device 14 includes four outlet pipes 14a, two of which are equipped with injection devices 14b. The outlet of the pipe is connected to the outlet pipe 14a through the injection devices 14b. The injection devices 14b are configured to adjust the proportion of foam entering the outlet pipe 14a from the branch pipe 220.

[0030] In an optional embodiment, the injection device 14b has a proportioning mechanism; the proportioning mechanism is configured to adjust the ratio of foam to water in the mixture of the outlet pipe 14a, and the proportioning mechanism has multiple settings, with different foam ratios in the mixture at different settings. This allows for flexible adjustment of the mixture ratio in the outlet pipe 14a of the injection device 14b, thereby adapting to different fire extinguishing scenarios.

[0031] Optionally, the injection device 14b has at least three proportional knobs, which are respectively set to a foam ratio of 1% in the water outlet pipe 14a, a foam ratio of 3% in the water outlet pipe 14a, and a foam ratio of 6% in the water outlet pipe 14a. The 1% setting is for handling conventional fire-fighting situations, the 3% setting is for handling light oil fires, and the 6% setting is for handling heavy oil fires.

[0032] It should be further noted that existing foam mixing systems mostly rely on fixed-ratio mixers, which can only provide 1-2 fixed foam concentrations (such as 3% and 6%), and cannot be adjusted in real time according to the fire type (such as 3% foam for light oil fires and 6% foam for heavy oil fires). Some manual adjustment systems lack flow monitoring and feedback mechanisms, and are prone to foam ratio deviations due to water pressure fluctuations, affecting fire extinguishing efficiency. This solution, however, can flexibly adjust the mixing ratio of the water outlet pipe 14a, thereby improving the technical problem of low foam ratio control accuracy in existing technologies.

[0033] As can also be seen from the figure, in an optional embodiment, the dual-media output fire suppression system further includes a drive motor 410, with the foam pump 16 being driven by the drive motor 410. The drive motor 410 is configured to adjust the pumping flow rate and pumping pressure of the foam pump 16 by adjusting the rotational speed of the drive motor 410 itself. This configuration simplifies the power transmission of the foam pump 16 and improves the system's flexibility. Optionally, the drive motor 410 is a hydraulic motor.

[0034] In an optional embodiment, the dual-media output fire suppression system further includes a power pump 420 and a side power take-off 430; the power pump 420 is driven by the side power take-off 430 and the drive motor 410; a low-level switch electrically connected to the central controller is provided in the foam tank 15; the low-level switch is configured to send a signal to the central controller when it detects that the liquid level in the foam tank 15 is lower than a preset level, so that the power pump 420 or the side power take-off 430 cuts off the power transmitted to the drive motor 410, thereby achieving pump disconnection protection. Optionally, the power pump 420 is a hydraulic pump.

[0035] The operation of the foam pump 16 can be improved by using the power pump 420 and the side power take-off 430 in combination, thereby providing high efficiency in the operation of the foam pump 16. It is easy to understand that in other embodiments of the present invention, the power structure of the foam pump 16 can also be a pneumatic pump, a motor, etc., which is just an example and is not limited to this.

[0036] Optionally, as an example, when the foam liquid tank level is below 5% (triggered by a low level switch), the central control module receives the level signal and automatically executes the defoaming pump operation, as follows: • If hydraulic valve control is used: close the hydraulic valve of the oil inlet pipe of foam pump 16 to cut off the power source of foam pump 16; • If a side power take-off 430 is used for control: disconnect the drive connection between the side power take-off 430 and the foam pump 16 to stop the foam pump 16 and prevent the foam pump 16 from running dry and being damaged.

[0037] As can also be seen from the figure, in an optional embodiment, the dual-media output fire protection system further includes a flushing pipe 510 and a flushing valve 511; one end of the flushing pipe 510 is connected to the water tank 11, and the other end is connected to the foam main pipe 210; the flushing pipe 510 is located at the connection point of the foam main pipe 210, between the foam pump 16 and the foam tank 15; the flushing valve 511 is located on the flushing pipe 510. This allows for convenient and quick, efficient cleaning of the foam pipeline.

[0038] As can be seen from the figure, in the optional implementation, the dual-media output fire protection system also includes a foam external suction connector 234 and a liquid discharge valve 236; from the direction of the foam tank 15 to the branch pipeline 220, the liquid discharge valve 236 and the foam external suction connector 234 are sequentially arranged on the foam main pipe 210; and the liquid discharge valve 236 and the foam external suction connector 234 are both located between the connection of the flushing pipeline 510 and the foam main pipe 210 and the foam tank 15.

[0039] In an optional embodiment, the dual-media output fire protection system further includes a foam inlet pipe 240 and an injection valve 241; one end of the foam inlet pipe 240 is connected to the foam tank 15 and the other end is connected to the foam main pipe 210; the foam inlet pipe is located at the connection of the foam main pipe 210, between the foam flow meter 231 and the foam pump 16.

[0040] Furthermore, in an optional embodiment, the dual-media output fire suppression system also includes a foam liquid outlet 235; the foam liquid outlet 235 is disposed on the foam main pipe 210; and the foam liquid outlet 235 is located between the connection point of the foam inlet pipe to the foam main pipe 210 and the foam flow meter 231. The foam liquid outlet 235 can serve as an outlet that only outputs foam liquid, thereby meeting different fire suppression scenarios.

[0041] It should be noted that in existing technologies, when using fire monitors to output foam, if the foam mixing pipeline is connected to the rear water inlet pipeline of the foam tank, impurities in the water system or diluted foam can easily flow back into the foam tank, contaminating the foam concentrate inside and causing it to become ineffective, increasing rescue costs and safety hazards. In contrast, the foam delivery pipeline and water delivery pipeline in this solution are set up separately, and the foam pipeline includes a main foam pipe 210 and branch pipes 220. Furthermore, the foam pipeline is equipped with inlet and outlet ports, flushing structures, etc., thus improving the high risk of foam concentrate contamination in existing technologies.

[0042] Thus, this system integrates five core functions: foam output, injection, external supply, transfer, and rinsing, all sharing a single foam pump 16 and control module. This reduces equipment redundancy and simplifies the operation process. Furthermore, compared to existing technologies where foam pipelines require separate piping and control modules for injection, external supply, transfer, and rinsing functions, resulting in high equipment redundancy, complex operation processes, a lack of unified program control logic, and susceptibility to system failures due to human error, this solution significantly improves system integration and ease of operation by integrating these functions into a single control module.

[0043] Specifically, this embodiment provides two specific working scenarios, as follows.

[0044] (I) Scenario 1: Fire monitor sprays foam (for oil fires) 1. Scenario Requirements: A heavy oil leak fire occurs in a chemical industrial park (requiring a 6% foam concentration), and the fire needs to be extinguished by spraying foam mixture from a distance using a fire monitor 13. 2. Operating steps: S1: Start the fire truck chassis engine, turn on the central control module touch screen, and enter "Fire Monitor 13 Foam Mode"; S2: Start two electric vacuum pumps to evacuate the fire pump pipeline (about 30 seconds). After the vacuum reaches -0.08MPa, start the fire pump and set the fire pump outlet pressure to 0.8MPa (corresponding to a flow rate of about 180L / S). S3: The central control module automatically starts the foam pump 16. The water pressure sensor 112 collects the water pressure P1=0.8MPa. The central controller instructs the hydraulic motor controller to adjust the speed of the foam pump 16 so that the foam pressure P2=0.85MPa (P2-P1=0.05MPa). S4: Select "Electrically Controlled Switch Valve 311-6% Foam Ratio" on the touchscreen. The system will automatically close "Outlet Foam Switch Valve 233" and open "Electrically Controlled Switch Valve 311". The foam will be injected into the fire pump pressure pipeline under positive pressure and mix with water to form a 6% foam ratio. S5: Operate the pitch and rotation mechanism of fire monitor 13 to spray at the fire point. Foam flow meter 231 monitors the foam flow rate in real time (approximately 10.8 L / S, corresponding to 6% of the 180 L / S water flow rate). If the flow rate deviation exceeds ±0.2 L / S, the central controller will automatically correct the hydraulic motor speed. S6: After the fire is extinguished, shut down the fire pump and foam pump 16, enter the "foam pipeline flushing mode", flush for 5 minutes and then shut down the system.

[0045] (ii) Scenario 2: Simultaneous output of water and foam dual media at the water outlet (for local mixed fires) 1. Scenario Requirements: A warehouse experiences a simultaneous fire involving cardboard boxes (requiring water cooling) and a small amount of alcohol (requiring 3% foam coverage). Water and foam need to be supplied simultaneously through the outlet. 2. Operating steps: S1: Start the fire pump, set the outlet water pressure to 0.6MPa (flow rate approximately 120L / S), and continuously output water through the outlet to cool the cardboard box fire; S2: The touch screen enters the "outlet foam mode", starts the foam pump 16, and the central controller adjusts P2=0.65MPa (P2-P1=0.05MPa). S3: The system automatically closes the "electric control switch valve 311" and opens the "outlet foam switch valve 233"; the operator rotates the "3% ratio knob" of the outlet manual injection device 14b, and the foam is injected into the outlet pipeline through the bypass, mixing with water to form a 3% foam mixture, which is used to cover alcohol fires; S4: Water flow meter 111 and foam flow meter 231 monitor the flow rate in real time to ensure that the water flow rate is 120L / S and the foam flow rate is 3.6L / S (3% ratio). If the water pressure fluctuates and the water flow rate becomes 100L / S, the central controller will automatically adjust the speed of foam pump 16 to reduce the foam flow rate to 3L / S and maintain the 3% ratio. S5: After the rescue is completed, turn off foam pump 16, keep the fire pump running for 5 minutes, and continue to flush the foam pipe at the outlet to avoid residual foam clogging.

[0046] It should be noted that, in this embodiment, the fire protection system can achieve a two-level foam ratio control mechanism, specifically including automatic control and manual control: Automatic control: Flow data is collected via foam flow meter 231 and water flow meter 111. The central controller calculates the actual foam ratio and adjusts the hydraulic motor speed accordingly to correct ratio deviations. Specifically, the central controller stores the current fire extinguishing mode. When a preset fire extinguishing mode is selected, the central controller regulates foam pump 16, water pump 12, and various valves to adjust the foam ratio in fire monitor 13 / outlet device 14. Subsequently, it collects data from foam flow meter 231 and water flow meter 111 to obtain the actual foam ratio under the current conditions. Then, it adjusts foam pump 16, water pump 12, and various valves to revise the control parameters, ensuring that the actual foam ratio reaches the preset value.

[0047] Manual control: The manual injection device 14b at the outlet is equipped with a 3-level proportional knob (1%, 3%, 6%), which operators can switch in real time according to the type of fire to meet individual needs. Specifically, the operator first determines which fire extinguishing mode is suitable for the current fire situation, and then switches the injection device 14b to the appropriate level according to the different fire extinguishing modes, thereby adjusting the foam ratio in a targeted manner for efficient and rapid fire extinguishing.

[0048] Secondly, the present invention provides a fire truck that includes the dual-media output fire suppression system of any of the foregoing embodiments. Such a fire truck can achieve simultaneous output of water and foam media, and can adjust the ratio of foam to water.

[0049] Thirdly, such as Figure 2 As shown, the present invention provides a control method based on any of the dual-media output fire protection systems described in the foregoing embodiments; The control method includes at least the following steps: The central controller collects the water pressure value P1 in real time through the water pressure sensor 112 and the foam pressure value P2 through the foam pressure sensor 232; the central controller adjusts the speed of the foam pump 16 to keep P2 greater than P1, and P2-P1=0.05~0.1Mpa. Close the electronic control switch valve 311, open the outlet foam switch valve 233, and inject the foam from the foam main pipe 210 into the outlet device 14 through the branch pipe 220 at a preset ratio. The outlet device 14 adjusts the preset ratio of the foam. And / or, open the electronically controlled switch valve 311, close the outlet foam switch valve 233, and inject the foam from the foam main pipe 210 into the outlet device 14 through the cannon pipe water passage 130 at a preset ratio. The electronically controlled switch valve 311 adjusts the preset ratio of the foam.

[0050] It should be noted that in existing technologies, foam needs to be injected into the water system pipeline for mixing. If the foam pressure is lower than the water pressure, back pressure will occur, blocking the foam injection (i.e., excessive water pressure causes water to enter the foam pipeline and block the output of the foam liquid), resulting in ineffective foam mixing. Existing systems often rely on manual experience to adjust the speed of the foam pump, resulting in strong pressure control lag and a tendency for foam interruption or excessive foam dilution. This solution improves upon these technical problems by adjusting the foam pressure value to be greater than the water pressure value.

[0051] Furthermore, the above control method can also achieve the following operations: (1. Dual-media synchronous output structure: A dual-path system of "water main line + foam bypass" is set in the outlet pipeline. The foam bypass is connected to the water main line through the manual injection device 14b, so as to realize "water is continuously output while foam is injected on demand", which solves the limitation of "single-media output" in traditional systems. (2. Two-level regulation mechanism for foam ratio:) Automatic control: The flow rate data is collected by "foam flow meter 231 + water flow meter 111", the PLC calculates the actual foam ratio, and the hydraulic motor speed is adjusted to correct the ratio deviation. Manual control: The manual injection device 14b at the water outlet is equipped with a 3-level proportional knob (1%, 3%, 6%), which can be switched in real time according to the type of fire to meet individual needs; (3. Pressure closed-loop control strategy: Pressure sensors are set up in the water circuit and foam pipeline respectively. The PLC compares the pressure values ​​of the two circuits in real time and dynamically adjusts the speed of foam pump 16 through the hydraulic motor controller to ensure that P2 is always 0.05-0.1MPa higher than P1, thereby fundamentally avoiding "water back pressure blocking foam injection"; (4. Anti-pollution pipeline design: The foam injection point of fire monitor 13 is set on the pressure side pipeline of fire pump (instead of the water inlet pipeline). The foam enters the high-pressure water circuit directly under positive pressure, without having to pass through the rear water inlet pipeline of foam tank 15, thus completely cutting off the "water-foam backflow channel" and preventing the foam concentrate from being contaminated.

[0052] In summary, the embodiments of the present invention provide a dual-media output fire protection system and control method, which have at least the following advantages: 1. Significantly improved fire extinguishing efficiency: Achieves "simultaneous output of water-foam dual media", which can simultaneously exert cooling and suffocation effects for complex fires (such as scenarios where oil fires and solid fires coexist), without the need to switch media, thus improving fire extinguishing response time; 2. High foam control precision: Through the dual mechanism of "automatic flow feedback and manual proportional adjustment", the foam ratio control error is small, and it can accurately match different fire types (1% for lightly hazardous places, 3% for light oil fires, and 6% for heavy oil fires), avoiding foam waste or insufficient fire extinguishing effect. 3. High system reliability: Closed-loop pressure control ensures stable foam injection without "foam interruption" (i.e., uneven foam delivery); the anti-pollution pipeline design improves the quality rate of foam concentrate and avoids rescue interruptions caused by concentrate contamination. 4. High functional integration: It integrates five core functions: foam output, tank injection, external supply, transfer and rinsing, and shares a single foam pump 16 and control module, which reduces equipment redundancy and simplifies the operation process (the working conditions can be switched through the central touch screen). 5. High safety: The automatic pump disconnection function at low liquid levels prevents the foam pump 16 from running dry and being damaged. The pressure sensor and flow meter monitor the system status in real time and trigger an audible and visual alarm when there is an abnormality, reducing the risk of equipment failure.

[0053] The above are merely specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A dual-media output fire suppression system, characterized in that, include: Water tank (11), water pump (12), fire monitor (13), water outlet device (14), foam tank (15), foam pump (16) and central controller; The inlet of the water pump (12) is connected to the water tank (11), and the outlet of the water pump (12) is connected to the inlet of the main waterway (110). The outlet of the main waterway (110) is connected to the fire monitor (13) through the cannon pipe waterway (130) and to the outlet device (14) through the branch waterway (120). A water flow meter (111) and a water pressure sensor (112) are installed on the main waterway (110). The outlet of the foam tank (15) is connected to the inlet of the foam main pipe (210), and the outlet of the foam main pipe (210) is connected to the outlet device (14) through the branch pipe (220). From the foam tank (15) to the branch pipe (220), the foam main pipe (210) is provided with a foam pump (16), a foam flow meter (231), and an outlet foam switch valve (233) in sequence. A foam pressure sensor (232) is provided on the foam main pipe (210) and / or the branch pipe (220). The inlet of the connecting pipe (310) is connected to the foam main pipe (210), and the outlet of the connecting pipe (310) is connected to the gun barrel water passage (130). An electrically controlled switch valve (311) is provided on the connecting pipe (310). The central controller is electrically connected to the water flow meter (111), the water pressure sensor (112), the foam pump (16), the foam flow meter (231), the outlet foam switch valve (233), the foam pressure sensor (232), and the electrically controlled switch valve (311).

2. The dual-media output fire suppression system according to claim 1, characterized in that: The outlet device (14) includes an outlet pipe (14a) and an injection device (14b), the outlet of the branch pipe (220) being connected to the outlet pipe (14a) via the injection device (14b); the injection device (14b) is configured to adjust the proportion of foam entering the outlet pipe (14a) from the branch pipe (220).

3. The dual-media output fire suppression system according to claim 2, characterized in that: The injection device (14b) has a proportioning mechanism; the proportioning mechanism is configured to adjust the ratio of foam and water in the mixture of the outlet pipe (14a), and the proportioning mechanism has multiple gears, with different foam ratios in the mixture at different gears.

4. The dual-media output fire suppression system according to claim 1, characterized in that: It also includes a drive motor (410), to which the foam pump (16) is connected; the drive motor (410) is configured to adjust the pumping flow rate and pumping pressure of the foam pump (16) by adjusting the rotational speed of the drive motor (410) itself.

5. The dual-media output fire suppression system according to claim 4, characterized in that: It also includes a power pump (420) and a side power take-off (430); the power pump (420) is connected to the drive motor (410) via the side power take-off (430); The foam tank (15) is equipped with a low liquid level switch that is electrically connected to the central controller. The low liquid level switch is configured to send a signal to the central controller when it detects that the liquid level of the foam tank (15) is lower than a preset liquid level, so that the power pump (420) or the side power take-off (430) cuts off the power transmitted to the drive motor (410).

6. The dual-media output fire suppression system according to claim 1, characterized in that: It also includes a flushing pipe (510) and a flushing valve (511); one end of the flushing pipe (510) is connected to the water tank (11), and the other end is connected to the foam main pipe (210); and the flushing pipe (510) is located at the connection of the foam main pipe (210), between the foam pump (16) and the foam tank (15); the flushing valve (511) is located on the flushing pipe (510).

7. The dual-media output fire suppression system according to claim 6, characterized in that: It also includes a foam external suction connector (234) and a liquid outlet valve (236); from the direction of the foam tank (15) to the branch pipeline (220), the liquid outlet valve (236) and the foam external suction connector (234) are sequentially arranged on the foam main pipe (210); and the liquid outlet valve (236) and the foam external suction connector (234) are both located between the connection of the flushing pipeline (510) and the foam tank (15) at the connection of the foam main pipe (210).

8. The dual-media output fire suppression system according to claim 1, characterized in that: It also includes a foam inlet pipe (240) and an injection valve (241); one end of the foam inlet pipe (240) is connected to the foam tank (15), and the other end is connected to the foam main pipe (210); the foam inlet pipe is located at the connection of the foam main pipe (210) and is located between the foam flow meter (231) and the foam pump (16); And / or, it also includes a foam outlet interface (235); the foam outlet interface (235) is disposed on the foam main pipe (210); and the foam outlet interface (235) is located between the connection of the foam inlet pipe disposed on the foam main pipe (210) and the foam flow meter (231).

9. A fire truck, characterized in that: The fire truck includes the dual-media output fire-fighting system as described in any one of claims 1-8.

10. A control method, characterized in that: The control method is based on the dual-media output fire protection system according to any one of claims 1-8; The control method includes at least the following steps: The central controller collects the water pressure value P1 in real time through the water pressure sensor (112) and the foam pressure value P2 through the foam pressure sensor (232); the central controller adjusts the speed of the foam pump (16) to keep P2 greater than P1. Close the electronically controlled switch valve (311), open the outlet foam switch valve (233), and inject foam from the foam main pipe (210) into the outlet device (14) through the branch pipe (220) at a preset ratio. The outlet device (14) adjusts the preset ratio of the foam. And / or, open the electronically controlled switch valve (311), close the outlet foam switch valve (233), and inject foam from the foam main pipe (210) into the outlet device (14) through the cannon pipe water passage (130) at a preset ratio. The electronically controlled switch valve (311) adjusts the preset ratio of the foam.

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