Unmanned aerial vehicle CAFS foam amount control device and method

Abstract

The invention discloses an unmanned aerial vehicle CAFS foam amount control device and method, and relates to the technical field of unmanned aerial vehicle fire fighting. The device comprises a mixer, a water inlet pipeline, a foam supply unit, a mixed liquid pipeline, a compressed air supply unit and a heat dissipation unit; the water inlet pipeline is sequentially provided with a water inlet pressure sensor, a main gate electromagnetic valve, a turbine flowmeter, a water inlet pipe pressure sensor and a first proportional control ball valve, the foam supply unit comprises a foam box and a foam variable frequency pump, and the output end of the foam variable frequency pump is connected with the water inlet pipeline through a second foam pipeline; a foam electromagnetic valve, a first gear flow meter, a foam pressure sensor and a second foam one-way valve are sequentially arranged on the second foam pipeline, and the problem that when an existing unmanned aerial vehicle foam fire extinguishing device is used, the foam spraying amount cannot be flexibly adjusted according to the real-time conditions such as the fire behavior and the spreading speed is solved; the fire is difficult to continuously and effectively extinguish in long-time fire extinguishing operation, and the fire extinguishing effect is poor.

Description

Technical Field

[0001] The present invention relates to the technical field of unmanned aerial vehicle (UAV) firefighting technology, and in particular to a UAV CAFS foam quantity control device and method. Background Art

[0002] With the rapid advancement of technology, drones are increasingly being used in firefighting. Among various firefighting methods, compressed air foam systems (CAFS) have attracted significant attention for their highly effective firefighting performance. CAFS injects compressed air into a foam mixture, creating a foam with high energy storage and strong adhesion. This significantly improves firefighting efficiency and effectively reduces the risk of rekindling. Traditional firefighting equipment often faces numerous challenges, such as in high-rise building fires. Fire trucks' ladders are limited in height, making it difficult to quickly reach the fire source. Drones, however, with their flexible maneuverability and high-altitude operational capabilities, can quickly reach the fire scene and achieve a rapid response. Therefore, drone-based foam extinguishing systems equipped with CAFS have become a highly promising firefighting technology. However, existing drone-based foam extinguishing systems have encountered several challenges in practical application. Due to the payload and space limitations of drones, the CAFS foam storage capacity is relatively limited. During prolonged, large-scale firefighting operations, limited foam reserves are insufficient to continuously meet firefighting needs, resulting in ineffective and sustained firefighting efforts and significantly reduced firefighting effectiveness. Furthermore, existing foam volume control methods are often imprecise and unable to flexibly adjust the foam volume based on real-time conditions such as the size and spread of the fire, further impacting firefighting efficiency. In summary, developing a device that can effectively address the limited foam storage capacity of drone-based foam firefighting devices while achieving precise foam volume control is of great practical significance. Summary of the Invention

[0003] Based on this, in response to the above problems, the present invention proposes a UAV CAFS foam amount control device and method, which solves the problem that the current UAV foam fire extinguishing device cannot flexibly adjust the foam spray amount according to real-time conditions such as the size of the fire and the spread speed during use, resulting in difficulty in continuous and effective fire extinguishing during long-term fire extinguishing operations and poor fire extinguishing effect.

[0004] The technical solution of the present invention is:

[0005] A UAV CAFS foam quantity control device includes: a mixer for mixing water and foam concentrate; a water inlet pipe, one end of which can be connected to a municipal water source and the other end is connected to the water inlet of the mixer; a foam supply unit, one end of which is connected to the water inlet pipe and is used to supply foam concentrate; a mixed liquid pipe, one end of which is connected to the water outlet of the mixer and the other end of which can be connected to a water hose; a compressed air supply unit, one end of which is connected to the mixed liquid pipe and is used to supply compressed air; and a heat dissipation unit, which is used to dissipate heat from the compressed air supply unit.

[0006] Among them, the water inlet pipe is provided with a water inlet pressure sensor, a main gate solenoid valve, a turbine flowmeter, a water inlet pipe pressure sensor and a first proportional adjustment ball valve which are arranged in sequence along the flow direction of the water source; the foam supply unit includes a foam box and a foam frequency conversion pump; the foam outlet end of the foam box is connected to the input end of the foam frequency conversion pump through a first foam pipe; a first foam one-way valve is provided on the first foam pipe; the output end of the foam frequency conversion pump is connected to the water inlet pipe through a second foam pipe; the second foam pipe is provided with a foam solenoid valve, a first gear flowmeter, a foam pressure sensor and a second foam one-way valve which are arranged in sequence along the flow direction of the foam raw liquid.

[0007] Preferably, the compressed air supply unit includes an air compressor and an engine, the output end of the engine is connected to the input end of the air compressor through a transmission structure for driving the air compressor, the compressed air output end of the air compressor is connected to the mixed liquid pipeline through an air pipe, the air pipe is provided with an air pressure sensor and an air one-way valve arranged in sequence along the flow direction of the compressed air, and the mixed liquid pipeline is provided with a mixed liquid one-way valve.

[0008] Preferably, the heat dissipation unit includes a radiator and a cooling oil pump, the cooling oil output end of the air compressor is connected to the input end of the cooling oil pump through a pipeline, the output end of the cooling oil pump is connected to the cooling oil inlet of the radiator through a pipeline, the cooling oil outlet of the radiator is connected to the cooling oil input end of the air compressor through a pipeline, a coolant inlet and a coolant outlet are provided on the radiator, the radiator includes a heat dissipation shell and a heat dissipation coil arranged in the heat dissipation shell, one end of the heat dissipation coil is connected to the cooling oil inlet, and the other end is connected to the cooling oil outlet, and the coolant inlet and the coolant outlet are respectively connected to the inside of the shell.

[0009] Preferably, it also includes an air pressure relief unit, which includes a first air exhaust pipe and a second air exhaust pipe, one end of the first air exhaust pipe is connected to the air compressor, and the other end is connected to the second air exhaust pipe, and a first air solenoid valve is provided on the first air exhaust pipe, and one end of the second air exhaust pipe is connected to the air pipe, and a second air solenoid valve is provided on the second air exhaust pipe.

[0010] Preferably, it also includes a fuel tank, the oil outlet end of the fuel tank is connected to the oil inlet end of the engine through an oil inlet pipe, which is used to supply fuel to the engine, and the fuel tank is provided with a fuel filling pipe and a fuel discharge pipe, one end of the fuel filling pipe is connected to the fuel tank, and the fuel filling pipe is provided with a fuel inlet one-way valve and a fuel filling pump arranged in sequence along the direction of fuel flow, and one end of the fuel discharge pipe is connected to the fuel tank, and the fuel discharge pipe is provided with a fuel discharge solenoid valve and a fuel discharge one-way valve arranged in sequence along the direction of fuel flow.

[0011] Preferably, a foam cleaning pipe and a regulating water pipe are provided on the water inlet pipe, one end of the foam cleaning pipe is connected to the water inlet pipe, and the other end is connected to the first foam pipe, and a cleaning solenoid valve is provided on the foam cleaning pipe, one end of the regulating water pipe is connected to the water inlet pipe, and the other end is connected to the mixed liquid pipe, and the regulating water pipe is provided with a regulating solenoid valve, a second gear flowmeter and a second proportional regulating ball valve arranged in sequence along the flow direction of the water source.

[0012] Preferably, the foam box is provided with a foam filling pipe and a foam discharge pipe, one end of the foam filling pipe is connected to the foam box, the foam filling pipe is provided with a raw liquid one-way valve and a raw liquid filling pump arranged in sequence along the flow direction of the foam raw liquid, one end of the foam discharge pipe is connected to the foam box, and the foam discharge pipe is provided with a foam discharge solenoid valve.

[0013] Preferably, a mixing cavity is provided in the mixer, the water inlet and outlet of the mixer are both connected to the mixing cavity, three blocking blocks are provided on the inner wall of the mixing cavity, the three blocking blocks are staggered, and a mixing flow channel for mixing the water source and the foam concentrate is formed between the three blocking blocks.

[0014] Preferably, it further comprises a mounting frame, and the foam variable frequency pump, the air compressor, the engine, the radiator and the fuel tank are all arranged on the mounting frame.

[0015] A method for controlling the amount of CAFS foam for a drone is provided, which uses the above-mentioned CAFS foam amount control device for a drone to control the amount of compressed foam sprayed.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] The present invention provides a foam supply unit comprising a foam tank and a foam variable frequency pump. The foam tank and the foam variable frequency pump are connected via a first foam pipe, and the foam variable frequency pump is connected to the water inlet pipe via a second foam pipe. A first gear flowmeter is installed on the second foam pipe. The first gear flowmeter monitors the flow rate of the foam stock solution in real time, and the foam variable frequency pump controls the input of the foam stock solution in real time, thereby enabling precise control of the input of the foam stock solution. Furthermore, a turbine flowmeter and a first proportional control ball valve are installed on the water inlet pipe. The turbine flowmeter monitors the input of the water source in real time, and the first proportional control ball valve adjusts the input of the water source, thereby enabling precise control of the input of the water source. During use, the injection volume can be adjusted by simply adjusting the input of the foam stock solution and the input of the water source according to actual conditions. This solves the problem that existing drone foam fire extinguishing devices cannot flexibly adjust the foam injection volume according to real-time conditions such as the size and spread of the fire, resulting in difficulty in maintaining effective firefighting during long-term firefighting operations and poor firefighting results. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0019] Figure 1 1 is a schematic diagram of the system structure of a UAV CAFS foam quantity control device according to an embodiment of the present invention;

[0020] Figure 2 is a schematic diagram of the system structure of the foam supply unit according to an embodiment of the present invention;

[0021] Figure 3 1 is a schematic diagram of the system structure of the compressed air supply unit, the heat dissipation unit and the air pressure relief unit according to an embodiment of the present invention;

[0022] Figure 4 1 is a schematic cross-sectional structural diagram of a mixer according to an embodiment of the present invention;

[0023] Figure 5 is a schematic diagram of a partial cross-sectional structure of a radiator according to an embodiment of the present invention;

[0024] Figure 6 This is a partial structural diagram of a UAV CAFS foam quantity control device according to an embodiment of the present invention. Figure 1 ;

[0025] Figure 7 This is a partial structural diagram of a UAV CAFS foam quantity control device according to an embodiment of the present invention. Figure 2 ;

[0026] Description of reference numerals:

[0027] 10-Mixer, 11-Water inlet pipe, 12-Foam supply unit, 13-Mixed liquid pipe, 14-Compressed air supply unit, 15-Heat dissipation unit, 16-Air pressure relief unit, 100-Water inlet pressure sensor, 101-Main gate solenoid valve, 102-Turbine flowmeter, 103-Water inlet pipe pressure sensor, 104-First proportional regulating ball valve, 105-Foam box, 106-Foam variable frequency pump, 107-First foam pipe, 108-First foam one-way valve, 109-Second foam pipe, 110-foam solenoid valve, 111-first gear flowmeter, 112-foam pressure sensor, 113-second foam check valve, 114-air compressor, 115-engine, 116-air pipe, 117-air pressure sensor, 118-air check valve, 119-mixed liquid check valve, 120-radiator, 121-cooling oil pump, 122-cooling oil inlet, 123-cooling oil outlet, 124-coolant inlet, 125-coolant outlet, 126-heat dissipation housing, 127-heat dissipation Heat coil, 128-first air exhaust pipe, 129-second air exhaust pipe, 130-first air solenoid valve, 131-second air solenoid valve, 132-fuel tank, 133-fuel inlet pipe, 134-fuel filling pipe, 135-fuel discharge pipe, 136-fuel inlet check valve, 137-fuel filling pump, 138-fuel discharge solenoid valve, 139-fuel discharge check valve, 140-foam cleaning pipe, 141-regulating water pipe, 142-cleaning solenoid valve, 143-regulating Solenoid valve, 144-second gear flowmeter, 145-second proportional control ball valve, 146-foam filling pipe, 147-foam discharge pipe, 148-raw liquid one-way valve, 149-raw liquid filling pump, 150-foam discharge solenoid valve, 151-mixing chamber, 152-blocking block, 153-mounting frame, 154-synchronous belt, 155-synchronous wheel, 156-first reducing tee, 157-second reducing tee, 158-tee connector, 159-third reducing tee, 160-control unit. DETAILED DESCRIPTION

[0028] Hereinafter, only certain exemplary embodiments are briefly described. As will be appreciated by those skilled in the art, the described embodiments may be modified in various ways without departing from the spirit or scope of the embodiments of the present invention. Therefore, the drawings and description are to be regarded as illustrative in nature and not restrictive.

[0029] In the description of the embodiments of the present invention, it should be understood that the terms "length", "vertical", "horizontal", "top", "bottom", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the embodiments of the present invention.

[0030] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Therefore, features defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the embodiments of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly specified.

[0031] In the embodiments of the present invention, unless otherwise expressly specified or limited, the terms "installed," "connected," "connected," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection, or communication; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the embodiments of the present invention based on specific circumstances.

[0032] In the embodiments of the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Furthermore, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above and obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly above and obliquely above the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0033] The disclosure below provides many different embodiments or examples for implementing different structures of the embodiments of the present invention. In order to simplify the disclosure of the embodiments of the present invention, the components and configurations of specific examples are described below. Of course, these are merely examples and are not intended to limit the embodiments of the present invention. In addition, the embodiments of the present invention may repeat reference numerals and / or reference letters in different examples. Such repetition is for the purpose of simplicity and clarity and does not in itself indicate the relationship between the various embodiments and / or configurations discussed.

[0034] The embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0035] Example:

[0036] like Figures 1 to 7 As shown, this embodiment discloses a UAV CAFS foam quantity control device, comprising: a mixer 10, the mixer 10 is used to mix water and foam stock solution; a water inlet pipe 11, one end of the water inlet pipe 11 can be connected to an external municipal water source, and the other end is connected to the water inlet end of the mixer 10; a foam supply unit 12, one end of the foam supply unit 12 is connected to the water inlet pipe 11, and is used to supply foam stock solution; a mixed liquid pipe 13, one end of the mixed liquid pipe 13 is connected to the water outlet end of the mixer 10, and the other end can be connected to an external water hose; a compressed air supply unit 14, one end of the compressed air supply unit 14 is connected to the mixed liquid pipe 13, and is used to supply compressed air; a heat dissipation unit 15, the heat dissipation unit 15 is used to dissipate heat for the compressed air supply unit 14;

[0037] Among them, the water inlet pipe 11 is provided with a water inlet pressure sensor 100, a main gate solenoid valve 101, a turbine flowmeter 102, a water inlet pipe pressure sensor 103 and a first proportional adjustment ball valve 104 which are arranged in sequence along the flow direction of the water source. The foam supply unit 12 includes a foam box 105 and a foam frequency conversion pump 106. The foam outlet end of the foam box 105 is connected to the input end of the foam frequency conversion pump 106 through a first foam pipe 107. The first foam pipe 107 is provided with a first foam one-way valve 108. The output end of the foam frequency conversion pump 106 is connected to the water inlet pipe 11 through a second foam pipe 109. The second foam pipe 109 is provided with a foam solenoid valve 110, a first gear flowmeter 111, a foam pressure sensor 112 and a second foam one-way valve 113 which are arranged in sequence along the flow direction of the foam concentrate.

[0038] The present invention provides a foam supply unit 12, which is configured as a foam tank 105 and a foam variable frequency pump 106. The foam tank 105 and the foam variable frequency pump 106 are connected via a first foam pipe 107, and the foam variable frequency pump 106 is connected to the water inlet pipe 11 via a second foam pipe 109. A first gear flowmeter 111 is provided on the second foam pipe 109. The first gear flowmeter 111 monitors the flow of the foam concentrate in real time, and the foam variable frequency pump 106 controls the input of the foam concentrate in real time, thereby enabling precise control of the input of the foam concentrate. Furthermore, a turbine flowmeter 102 and a first proportional control ball valve 104 are provided on the water inlet pipe 11. The turbine flowmeter 102 monitors the input of the water source in real time, and the first proportional control ball valve 104 adjusts the input of the water source, thereby enabling precise control of the input of the water source. During use, the spray volume can be adjusted by simply adjusting the input of the foam concentrate and the input of the water source according to actual conditions. This solves the problem that the current drone foam fire extinguishing device cannot flexibly adjust the foam spray volume according to the real-time conditions such as the size of the fire and the speed of spread, resulting in difficulty in continuous and effective fire extinguishing during long-term fire extinguishing operations and poor fire extinguishing effects.

[0039] To facilitate the input of compressed air, this embodiment is improved upon the above embodiment. The difference from the above embodiment lies in that the compressed air supply unit 14 includes an air compressor 114 and an engine 115. The output end of the engine 115 is connected to the input end of the air compressor 114 via a transmission structure for driving the air compressor 114. The compressed air output end of the air compressor 114 is connected to the mixed liquid pipeline 13 via an air pipe 116. The air pipe 116 is provided with an air pressure sensor 117 and an air check valve 118, which are sequentially arranged along the flow direction of the compressed air. The mixed liquid pipeline 13 is provided with a mixed liquid check valve 119. The transmission structure includes a synchronous belt 154 and a pair of synchronous pulleys 155, one of which is fixedly mounted on the output end of the engine 115 and the other is fixedly mounted on the input end of the air compressor 114. The synchronous belt 154 is sleeved on the pair of synchronous pulleys 155 and meshes with the synchronous pulleys 155 for transmission.

[0040] During use, the engine 115 drives the synchronous belt 154 and a pair of synchronous pulleys 155, which in turn drive the air compressor 114 to operate, thereby completing the compressed air output. The air compressor 114 can be an existing air compressor 114 capable of achieving the functions of the present invention, and the engine 115 can be a existing gasoline engine 115 capable of achieving the functions of the present invention.

[0041] In order to facilitate the heat dissipation of the air compressor 114, extend the working time of the air compressor 114, and thus facilitate continuous fire extinguishing, this embodiment is improved on the basis of the above embodiment. The difference from the above embodiment is that the heat dissipation unit 15 includes a radiator 120 and a cooling oil pump 121. The cooling oil output end of the air compressor 114 is connected to the input end of the cooling oil pump 121 through a pipeline, the output end of the cooling oil pump 121 is connected to the cooling oil inlet 122 of the radiator 120 through a pipeline, and the cooling oil outlet 123 of the radiator 120 is connected to the cooling oil input end of the air compressor 114 through a pipeline. A coolant inlet 124 and a coolant outlet 125 are provided on the radiator 120. The radiator 120 includes a heat dissipation shell 126 and a heat dissipation coil 127 arranged in the heat dissipation shell 126. One end of the heat dissipation coil 127 is connected to the cooling oil inlet 122, and the other end is connected to the cooling oil outlet 123. The coolant inlet 124 and the coolant outlet 125 are respectively connected to the interior of the heat dissipation shell 126.

[0042] The air compressor 114 adopts the air compressor 114 that uses cooling oil cooling in the existing technology. By setting a radiator 120 and a cooling oil pump 121, when in use, the cooling oil in the air compressor 114 can enter the cooling oil pump 121 from the pipeline, and under the action of the cooling oil pump 121, enter the heat dissipation coil 127 in the radiator 120. At the same time, flowing coolant is injected through the coolant inlet 124 and the coolant outlet 125, so that when the coolant comes into contact with the heat dissipation coil 127, it takes away the temperature of the cooling oil in the heat dissipation coil 127 in time, thereby improving the heat dissipation effect of the air compressor 114, greatly extending the working time of the air compressor 114, and facilitating continuous fire extinguishing.

[0043] In order to prevent excessive pressure in the air duct 116 and the air compressor 114, which may cause damage to the air duct 116 and the air compressor 114, this embodiment is improved on the basis of the above embodiment. The difference from the above embodiment is that it also includes an air pressure relief unit 16. The air pressure relief unit 16 includes a first air exhaust pipe 128 and a second air exhaust pipe 129. One end of the first air exhaust pipe 128 is connected to the air compressor 114, and the other end is connected to the second air exhaust pipe 129. A first air solenoid valve 130 is provided on the first air exhaust pipe 128, and one end of the second air exhaust pipe 129 is connected to the air duct 116. A second air solenoid valve 131 is provided on the second air exhaust pipe 129.

[0044] During use, when the air pressure sensor 117 detects that the pressure in the air pipe 116 is too high, the first air solenoid valve 130 and the second air solenoid valve 131 are opened, so that the compressed air in the air pipe 116 can be discharged from the second air exhaust pipe 129, and the air in the air compressor 114 can be discharged from the first air exhaust pipe 128.

[0045] In order to facilitate the supply of gasoline to the engine 115, this embodiment is improved on the basis of the above embodiment. The difference from the above embodiment is that it also includes a fuel tank 132. The oil outlet end of the fuel tank 132 is connected to the oil inlet end of the engine 115 through an oil inlet pipe 133, which is used to supply fuel to the engine 115. A fuel filling pipe 134 and a fuel discharge pipe 135 are provided on the fuel tank 132. One end of the fuel filling pipe 134 is connected to the fuel tank 132, and a fuel inlet one-way valve 136 and a fuel filling pump 137 are arranged in sequence along the direction of fuel flow on the fuel filling pipe 134. One end of the fuel discharge pipe 135 is connected to the fuel tank 132, and a fuel discharge solenoid valve 138 and a fuel discharge one-way valve 139 are arranged in sequence along the direction of fuel flow on the fuel discharge pipe 135.

[0046] The provision of fuel tank 132 facilitates the supply of gasoline to engine 115. A fuel filling line 134 on fuel tank 132 facilitates the addition of gasoline, while a fuel discharge line 135 on fuel tank 132 allows for the discharge of gasoline from fuel tank 132 when not in use, facilitating long-term storage. The provision of a fuel filling pump 137 facilitates gasoline refilling. The provision of a fuel inlet check valve 136 and a fuel outlet check valve prevents gasoline backflow. The provision of a fuel discharge solenoid valve 138 facilitates the control of gasoline discharge.

[0047] In order to facilitate the cleaning of the foam pipe, this embodiment is improved on the basis of the above embodiment. The difference from the above embodiment is that a foam cleaning pipe 140 and a regulating water pipe 141 are provided on the water inlet pipe 11. One end of the foam cleaning pipe 140 is connected to the water inlet pipe 11, and the other end is connected to the first foam pipe 107. A cleaning solenoid valve 142 is provided on the foam cleaning pipe 140. One end of the regulating water pipe 141 is connected to the water inlet pipe 11, and the other end is connected to the mixed liquid pipe 13. The regulating water pipe 141 is provided with a regulating solenoid valve 143, a second gear flowmeter 144 and a second proportional regulating ball valve 145 which are arranged in sequence along the flow direction of the water source.

[0048] The foam cleaning pipe 140 is provided to facilitate cleaning of the foam variable frequency pump 106, the second foam pipe 109, the mixer 10 and the mixed liquid pipe 13 after use. The water regulating pipe 141 is provided to facilitate further adjustment of the injection amount of the compressed foam.

[0049] In order to add foam concentrate and discharge foam concentrate, this embodiment is improved on the basis of the above embodiment. The difference from the above embodiment is that a foam filling pipe 146 and a foam discharge pipe 147 are provided on the foam box 105. One end of the foam filling pipe 146 is connected to the foam box 105. The foam filling pipe 146 is provided with a concentrate one-way valve 148 and a concentrate filling pump 149 arranged in sequence along the flow direction of the foam concentrate. One end of the foam discharge pipe 147 is connected to the foam box 105. The foam discharge pipe 147 is provided with a foam discharge solenoid valve 150.

[0050] The setting of the raw liquid one-way valve 148 can prevent the foam raw liquid from flowing back, the setting of the raw liquid filling pump 149 can facilitate the filling of the foam raw liquid. The setting of the foam discharge electromagnetic valve 150 can facilitate the discharge of the foam raw liquid.

[0051] In order to facilitate the mixing of the foam liquid and the water source, this embodiment is improved on the basis of the above embodiment. The difference from the above embodiment is that a mixing cavity 151 is provided in the mixer 10, and the water inlet and outlet ends of the mixer 10 are both connected to the mixing cavity 151. Three blocking blocks 152 are provided on the inner wall of the mixing cavity 151. The three blocking blocks 152 are staggered, and a mixing flow channel for mixing the water source and the foam liquid is formed between the three blocking blocks 152.

[0052] After the foam stock solution and the water source enter the mixing cavity 151, they are blocked by the three blocking blocks 152 to form an impact and can only flow from the mixing channel. The three blocking blocks 152 form a turbulent flow for the foam stock solution and the water source, thereby achieving mixing of the foam stock solution and the water source.

[0053] It should be noted that the second foam pipe 109 is connected to the water inlet pipe 11 via a first reducing tee 156, which is provided on the water inlet pipe 11. One end of the second foam pipe 109 is connected to the smaller end of the first reducing tee 156, which is located between the mixer 10 and the first proportional control ball valve 104. One end of the foam cleaning pipe 140 is connected to the water inlet pipe 11 via a second reducing tee 157, which is provided on the water inlet pipe 11 and located between the first reducing tee 156 and the first proportional control ball valve 104. The other end of the foam cleaning pipe 140 is connected to the first foam pipe 107 via a tee joint 158, which is provided on the first foam pipe 107. One end of the foam cleaning pipe 140 is connected to one end of the tee joint 158. One end of the regulating water pipe 141 is connected to the water inlet pipe 11, and the connection between the regulating water pipe 141 and the water inlet pipe 11 is located between the water inlet pressure sensor 100 and the main gate solenoid valve 101. The other end of the regulating water pipe 141 is connected to the mixed liquid pipe 13, and the connection between the regulating water pipe 141 and the mixed liquid pipe 13 is located at the rear end of the mixed liquid one-way valve 119. One end of the second air exhaust pipe 129 is connected to the air pipe 116, and the connection between the second air exhaust pipe 129 and the air pipe 116 is located between the air pressure sensor 117 and the air compressor 114. The second air exhaust pipe 129 is provided with a second air solenoid valve 131. One end of the first air exhaust pipe 128 is connected to the air compressor 114, and the other end is connected to the second air exhaust pipe 129 through a third reducing tee 159. The third reducing tee 159 is arranged on the second air exhaust pipe 129 and is located at the rear end of the second air solenoid valve 131. The first air exhaust pipe 128 is connected to the end with a smaller diameter of the third reducing tee 159.

[0054] To facilitate installation of the overall structure of the present invention, this embodiment is improved upon the above-mentioned embodiment. The difference from the above-mentioned embodiment is that it further includes a mounting frame 153, on which the foam variable frequency pump 106, air compressor 114, engine 115, radiator 120, and fuel tank 132 are all mounted. All of the aforementioned pipelines are centrally mounted on the mounting frame 153, and the foam tank 105 is mounted on one side of the mounting frame 153.

[0055] When in use, the separately provided foam box 105 can be set to a larger volume. Since the foam box 105 is externally placed, the volume of the fuel tank 132 can be increased, thereby extending the service life. At the same time, the above-mentioned various pipelines can be centrally arranged on the installation frame 153, thereby facilitating the installation of the entire device.

[0056] In the above embodiment, it is further preferred that a control unit 160 is also included. The control unit 160 is embedded and installed on the side of one side of the mounting frame 153. The control unit 160 includes a controller and a touch display. The touch display is electrically connected to the controller, and the touch display is used to control the controller. Among them, the controller is electrically connected to the water inlet pressure sensor 100, the main gate solenoid valve 101, the turbine flowmeter 102, the water inlet pipe pressure sensor 103, the first proportional control ball valve 104, the foam frequency conversion pump 106, the foam solenoid valve 110, the first gear flowmeter 111, the foam pressure sensor 112, the air compressor 114, the engine 115, the air pressure sensor 117, the cooling oil pump 121, the first air solenoid valve 130, the second air solenoid valve 131, the fuel filling pump 137, the fuel discharge solenoid valve 138, the cleaning solenoid valve 142, the regulating solenoid valve 143, the second gear flowmeter 144, the second proportional control ball valve 145, the raw liquid filling pump 149 and the foam discharge solenoid valve 150, for controlling the injection amount of compressed foam.

[0057] A method for controlling the amount of foam in a UAV CAFS is provided, which uses the UAV CAFS foam amount control device described above to control the amount of compressed foam sprayed, and specifically includes the following steps:

[0058] The UAV CAFS foam quantity control device is installed on a rescue vehicle and transported to the fire site by the rescue vehicle;

[0059] Connect one end of the water inlet pipe 11 to municipal water, for example, a fire hydrant, and connect the mixed liquid pipe 13 to the fire extinguishing gun on the drone through a hose;

[0060] According to the fire situation at the scene, the control unit 160 adjusts the input amount of foam liquid and water source;

[0061] Remotely control the drone to the designated fire-fighting location and aim the fire-fighting spray gun at the fire point;

[0062] Activate the drone CAFS foam quantity control device to supply compressed foam to the fire extinguishing spray gun on the drone to start fire extinguishing;

[0063] According to the fire extinguishing situation, the ratio of the foam concentrate input and the water source input is adjusted in real time by the control unit 160 to continuously extinguish the fire until the fire is extinguished.

[0064] Through the UAV CAFS foam quantity control method described in the present invention, the foam stock liquid input amount and the water source input amount can be adjusted in real time according to the fire extinguishing situation during fire extinguishing, thereby adjusting the ratio of foam stock liquid and water source in the compressed foam. At the initial stage of fire extinguishing, the foam stock liquid input amount is large, and then the foam stock liquid input amount begins to be gradually reduced, so that the same volume of foam stock liquid can be maintained longer, thereby achieving a better fire extinguishing effect.

[0065] Although the preferred embodiments of the present invention have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention.

[0066] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. It should be pointed out that any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A UAV CAFS foam quantity control device, characterized in that: include: A mixer (10), the mixer (10) is used to mix water and foam stock solution; A water inlet pipe (11), one end of which can be connected to a municipal water source, and the other end of which is connected to the water inlet end of the mixer (10); A foam supply unit (12), one end of which is connected to the water inlet pipe (11) and is used to supply foam stock solution; A mixed liquid pipeline (13), one end of which is connected to the water outlet of the mixer (10), and the other end of which can be connected to an external water hose; A compressed air supply unit (14), one end of which is connected to the mixed liquid pipeline (13) for supplying compressed air; a heat dissipation unit (15), the heat dissipation unit (15) being used to dissipate heat for the compressed air supply unit (14); The water inlet pipe (11) is provided with a water inlet pressure sensor (100), a main gate electromagnetic valve (101), a turbine flowmeter (102), a water inlet pipe pressure sensor (103) and a first proportional regulating ball valve (104) which are sequentially arranged along the flow direction of the water source; the foam supply unit (12) comprises a foam box (105) and a foam variable frequency pump (106); the foam outlet end of the foam box (105) is connected to the input end of the foam variable frequency pump (106) through a first foam pipe (107); the first foam pipe (107) is provided with a first foam check valve (108); the output end of the foam variable frequency pump (106) is connected to the water inlet pipe (11) through a second foam pipe (109); the second foam pipe (109) is provided with a foam electromagnetic valve (110), a first gear flowmeter (111), a foam pressure sensor (112) and a second foam check valve (113) which are sequentially arranged along the flow direction of the foam stock solution.

2. The UAV CAFS foam quantity control device according to claim 1, characterized in that: The compressed air supply unit (14) includes an air compressor (114) and an engine (115). The output end of the engine (115) is connected to the input end of the air compressor (114) via a transmission structure for driving the air compressor (114). The compressed air output end of the air compressor (114) is connected to the mixed liquid pipeline (13) via an air pipeline (116). The air pipeline (116) is provided with an air pressure sensor (117) and an air check valve (118) sequentially arranged along the flow direction of the compressed air. The mixed liquid pipeline (13) is provided with a mixed liquid check valve (119).

3. The UAV CAFS foam quantity control device according to claim 2, characterized in that: The heat dissipation unit (15) includes a radiator (120) and a cooling oil pump (121). The cooling oil output end of the air compressor (114) is connected to the input end of the cooling oil pump (121) through a pipeline. The output end of the cooling oil pump (121) is connected to the cooling oil inlet (122) of the radiator (120) through a pipeline. The cooling oil outlet (123) of the radiator (120) is connected to the cooling oil input end of the air compressor (114) through a pipeline. The radiator (120) is provided with a coolant inlet (124) and a coolant outlet (125). The radiator (120) includes a heat dissipation housing (126) and a heat dissipation coil (127) arranged in the heat dissipation housing (126). One end of the heat dissipation coil (127) is connected to the cooling oil inlet (122) and the other end is connected to the cooling oil outlet (123). The coolant inlet (124) and the coolant outlet (125) are respectively communicated with the interior of the heat dissipation housing (126).

4. The UAV CAFS foam quantity control device according to claim 3, characterized in that: The air pressure relief unit (16) further comprises a first air discharge pipe (128) and a second air discharge pipe (129). One end of the first air discharge pipe (128) is connected to the air compressor (114), and the other end is connected to the second air discharge pipe (129). A first air solenoid valve (130) is provided on the first air discharge pipe (128). One end of the second air discharge pipe (129) is connected to the air pipe (116), and a second air solenoid valve (131) is provided on the second air discharge pipe (129).

5. The UAV CAFS foam quantity control device according to claim 4, characterized in that: The invention also includes a fuel tank (132), the oil outlet end of the fuel tank (132) is connected to the oil inlet end of the engine (115) through an oil inlet pipe (133), and is used to supply oil to the engine (115). The fuel tank (132) is provided with a fuel filling pipe (134) and a fuel discharge pipe (135). One end of the fuel filling pipe (134) is connected to the fuel tank (132), and the fuel filling pipe (134) is provided with a fuel inlet check valve (136) and a fuel filling pump (137) arranged in sequence along the fuel flow direction. One end of the fuel discharge pipe (135) is connected to the fuel tank (132), and the fuel discharge pipe (135) is provided with a fuel discharge solenoid valve (138) and a fuel discharge check valve (139) arranged in sequence along the fuel flow direction.

6. The UAV CAFS foam quantity control device according to claim 5, characterized in that: A foam cleaning pipe (140) and a regulating water pipe (141) are provided on the water inlet pipe (11). One end of the foam cleaning pipe (140) is connected to the water inlet pipe (11), and the other end is connected to the first foam pipe (107). A cleaning solenoid valve (142) is provided on the foam cleaning pipe (140). One end of the regulating water pipe (141) is connected to the water inlet pipe (11), and the other end is connected to the mixed liquid pipe (13). The regulating water pipe (141) is provided with a regulating solenoid valve (143), a second gear flow meter (144), and a second proportional regulating ball valve (145) which are sequentially arranged along the flow direction of the water source.

7. The UAV CAFS foam quantity control device according to claim 6, characterized in that: The foam box (105) is provided with a foam filling pipe (146) and a foam discharge pipe (147). One end of the foam filling pipe (146) is connected to the foam box (105). The foam filling pipe (146) is provided with a raw liquid one-way valve (148) and a raw liquid filling pump (149) arranged in sequence along the flow direction of the foam raw liquid. One end of the foam discharge pipe (147) is connected to the foam box (105). The foam discharge pipe (147) is provided with a foam discharge solenoid valve (150).

8. The UAV CAFS foam quantity control device according to claim 7, characterized in that: A mixing cavity (151) is provided in the mixer (10), and the water inlet and outlet of the mixer (10) are both in communication with the mixing cavity (151). Three blocking blocks (152) are provided on the inner side wall of the mixing cavity (151). The three blocking blocks (152) are arranged in a staggered manner, and a mixing flow channel for mixing a water source and a foam stock solution is formed between the three blocking blocks (152).

9. The UAV CAFS foam quantity control device according to claim 8, characterized in that: The invention also includes a mounting frame (153), on which the foam variable frequency pump (106), the air compressor (114), the engine (115), the radiator (120) and the fuel tank (132) are all arranged.

10. A method for controlling the amount of foam in a UAV CAFS, characterized in that: The compressed foam injection amount is controlled using a UAV CAFS foam amount control device according to any one of claims 1 to 9.

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