Backpack fire extinguishing device

Abstract

The utility model relates to the field of fire fighting equipment, and discloses a backpack fire extinguishing device which comprises a liquid storage tank, a fire extinguishing device and a control system, a mixing device; a liquid inlet of the water pump is communicated with the liquid storage tank, and a liquid outlet of the water pump is communicated with the mixing device so as to supply liquid to the mixing device; an air outlet of the air pump is communicated with the mixing device so as to supply compressed air to the mixing device; and the spraying device is communicated with the mixing device and is used for spraying compressed air foam. The backpack fire extinguishing device can generate compressed air foam and is safe and convenient to use.

Description

Technical Field

[0001] The present application belongs to the field of fire fighting equipment, and specifically relates to a backpack fire extinguishing device. Background Art

[0002] The backpack compressed air foam fire extinguishing device in the prior art is mainly driven by a high-pressure gas cylinder, which has certain safety hazards due to the pressure vessel involved. In addition, the high-pressure gas cylinder needs professional equipment and professionals to inflate, which is difficult for ordinary users to inflate. Summary of the invention

[0003] The purpose of the present application is to provide a backpack fire extinguishing device, which is safer and more convenient to use.

[0004] In order to achieve the above-mentioned object, the present application provides a backpack fire extinguishing device on one hand, which includes:

[0005] liquid storage tank;

[0006] Mixing device;

[0007] a water pump, wherein a liquid inlet of the water pump is communicated with the liquid storage tank, and a liquid outlet of the water pump is communicated with the mixing device to supply liquid to the mixing device;

[0008] an air pump in communication with the mixing device to supply compressed air to the mixing device; and

[0009] The spraying device is connected with the mixing device and is used for spraying compressed air foam.

[0010] In some specific embodiments, the backpack fire extinguishing device also includes a control module and an air pump interrupt switch, and the control module is respectively communicated with the air pump interrupt switch, the water pump and the air pump and is used to control the water pump and the air pump to start or shut down according to the switch signal of the air pump interrupt switch.

[0011] In some specific embodiments, the backpack fire extinguishing device also includes the pressure detector that is communicatively connected to the control module, and the pressure detector is arranged on the pipeline between the mixing device and the spraying device and is used to detect the working pressure in the pipeline. The control module is also used to control the water pump to stop or keep it in the started state according to the water pump being in the started state and the working pressure detected by the pressure detector.

[0012] In some specific embodiments, the backpack fire extinguishing device also includes a liquid level detector that is communicatively connected to the control module, the liquid level detector is arranged in the liquid storage tank and is used to detect the liquid level in the liquid storage tank, and the control module is also used to control the water pump to stop or keep it in the started state according to the water pump being in the started state and the liquid level of the liquid level detector.

[0013] In some specific embodiments, the backpack fire extinguishing device also includes a power supply and a start switch, the power supply is used to supply power to the water pump and the air pump, the start switch is communicatively connected to the control module, and the control module is also used to control the power supply status of the power supply according to the switch signal of the start switch after controlling the water pump to stop.

[0014] In some specific embodiments, the spraying device may have a DC foam spraying structure and a fine water mist spraying structure that can be switched between use, the DC foam spraying structure is used to spray the compressed air foam, and the fine water mist spraying structure is used to spray fine water mist.

[0015] In some embodiments, the air pump can be an electric diaphragm pump or an electric piston pump.

[0016] In some specific embodiments, the flow rate of the air pump is 50 L / min to 180 L / min.

[0017] In some specific embodiments, the mixing device may be provided with a foaming chamber therein, and the foaming chamber is configured as a Venturi tube structure with a narrowed middle pipe section, the two tube ends of the foaming chamber are connected between the liquid outlet of the water pump and the spraying device, and the middle pipe section of the foaming chamber has an air inlet hole connected to the air outlet of the air pump.

[0018] In some specific embodiments, the mixing device may be provided with a safety pressure relief valve connected to the foaming chamber.

[0019] Through the above technical solution, by integrating the air pump and the water pump into the backpack fire extinguishing device, the backpack fire extinguishing device can generate compressed air without a pressure vessel, thereby generating compressed air foam, and the fire extinguishing efficiency is high. In addition, since the backpack fire extinguishing device uses an air pump to provide compressed air, it does not need to be inflated in advance, and is safer and more convenient to use. In addition, the injection pressure of the compressed air foam can be provided by the water pump, which is conducive to reducing the volume of the air pump and reducing the configuration of the air pump, thereby making the structure of the backpack fire extinguishing device simpler and more reasonable.

[0020] Other features and advantages of the embodiments of the present application will be described in detail in the subsequent detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The accompanying drawings are used to provide a further understanding of the embodiments of the present application and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the embodiments of the present application, but do not constitute a limitation on the embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without creative work. In the drawings:

[0022] Figure 1 A schematic structural diagram of a backpack fire extinguishing device according to a specific embodiment of the present application is shown;

[0023] Figure 2 Shows Figure 1 A control flow diagram of a control method for a backpack fire extinguishing device is shown in FIG.

[0024] Description of Reference Numerals

[0025] 1 Fluid tank 2 Strap

[0026] 3 Liquid level detector 4 Start switch

[0027] 5 Air pump interrupter switch 6 Power supply

[0028] 7 Control module 8 Prompt module

[0029] 9 Air pump 10 Water pump

[0030] 11 Mixing device 12 Pressure detector

[0031] 13 Pressure gauge 14 Spray device

[0032] 15 Safety relief valve 101 Filling port DETAILED DESCRIPTION

[0033] The specific implementation of the present application is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described here is only used to illustrate and explain the present application, and is not used to limit the present application.

[0034] like Figure 1As shown, the present application provides a backpack fire extinguishing device on one hand, which includes a device body and a liquid storage tank 1, a shoulder strap 2, a mixing device 11, a water pump 10, an air pump 9 and a spraying device 14 integrated on the device body. The liquid storage tank 1 is used to store fire extinguishing liquid, and the shoulder strap 2 is installed and fixed on the back side of the liquid storage tank 1, so that the user can carry it on his back for use. The liquid inlet of the water pump 10 is connected to the liquid storage tank 1, the liquid outlet of the water pump 10 is connected to the mixing device 11 to pump and supply the fire extinguishing liquid to the mixing device 11, and the air outlet of the air pump 9 is connected to the mixing device 11 to supply compressed air to the mixing device 11. The spraying device 14 is used to spray compressed air foam and is connected to the mixing device 11. After the fire extinguishing liquid and the compressed air are mixed in the mixing device 11, they enter the spraying device 14 and are sprayed through the spraying device 14.

[0035] The water pump 10 is a micro electric water pump. Since the injection pressure of the water pump 10 is relatively large, the injection drive of the fire extinguishing liquid is mainly responsible for the water pump 10, and the air pump 9 hardly participates in the drive. In this way, only a micro air pump with a small flow rate is needed, which can reduce the volume of the air pump 9 and reduce the configuration of the air pump 9, thereby making the structure of the backpack fire extinguishing device simpler and more reasonable, and also reducing the weight of the whole machine to a certain extent, which is suitable for the portability of the backpack fire extinguishing device.

[0036] In addition, by integrating the air pump 9 into the backpack fire extinguishing device, the backpack fire extinguishing device can generate compressed air without a pressure container, thereby generating compressed air foam, and the fire extinguishing efficiency is high. Moreover, since the backpack fire extinguishing device uses the air pump 9 to provide compressed air, it does not need to be inflated in advance, and the high-pressure inflation operation of the gas storage bottle is eliminated, making it safer and more convenient to use.

[0037] In some specific embodiments, the air pump 9 may be an electric diaphragm pump or an electric piston pump, and the air pump 9 is a micro air pump with a flow rate of 50L / min to 180L / min. The air outlet of the air pump 9 is sealedly connected to the air inlet of the mixing device 11, and the compressed air can be delivered to the foaming chamber of the mixing device 11. The water pump 10 is an electric micro water pump, and its liquid inlet is sealedly connected to the bottom of the liquid storage tank 1, and the liquid outlet is sealedly connected to the water inlet of the mixing device 11, and the mixed liquid in the liquid storage tank 1 can be delivered through the mixing chamber of the mixing device 11, and finally sprayed out through the spraying device 14.

[0038] In addition, since the air pump 9 is a micro air pump and the water pump 10 is an electric micro water pump with a small size, the water pump 10, air pump 9, mixing device 11, power supply 6, control module 7 and prompt module 8 and other structures can all be integrated into the shell of the backpack fire extinguishing device, making the backpack fire extinguishing device more miniaturized and lightweight, which is convenient for use and carrying at the fire extinguishing scene.

[0039] Optionally, a filling port 101 is designed at the top of the liquid storage tank 1, and the filling port 101 is opened or closed by a threaded end cap, and the user can add fire extinguishing agent by opening the filling port 101. In order to control the full load mass of the fire extinguishing device and consider the corrosion resistance requirements, the liquid storage tank 1 can be made of plastic, and the internal volume is preferably designed to be 10 to 18L.

[0040] Alternatively, if Figure 1 As shown, a foaming chamber is provided in the mixing device 11, and the foaming chamber is set as a venturi tube structure, that is, the middle pipe section is narrowed, the first pipe end of the foaming chamber is connected to the liquid outlet of the water pump 10, and the second pipe end is connected to the spraying device 14, the gas-liquid mixing effect is good, which is conducive to the miniaturization of the backpack fire extinguishing device. The middle pipe section of the foaming chamber has an air inlet connected to the air outlet of the air pump 9, and the air inlet is sealed and connected to the air outlet of the air pump 9 through an air pipe.

[0041] Optionally, a safety pressure relief valve 15 communicating with the foaming chamber is provided on the mixing device 11 , and an air outlet is also provided in the middle pipe section of the foaming chamber, and the air outlet is sealedly connected to the safety pressure relief valve 15 .

[0042] Optionally, the backpack fire extinguishing device may also include a pressure gauge 13, which can be installed on the pipeline between the liquid outlet of the mixing device 11 and the liquid inlet of the injection device 14, and can display the internal working pressure of the whole machine in real time, so that the user can observe the internal pressure of the whole machine.

[0043] In some specific embodiments, the liquid inlet of the spray device 14 is sealed and connected to the water outlet of the mixing device 11. The spray device 14 can be a multifunctional spray gun and has two modes: direct current foam and fine water mist. That is, the spray device 14 has a direct current foam spray structure and a fine water mist spray structure that can be switched. The direct current foam spray structure is used to spray compressed air foam, and the fine water mist spray structure is used to spray fine water mist. The spray device 14 can switch modes by switching the handle. The user can switch the spray mode according to the needs of the fire scene, and it can be turned on by pressing the spray gun switch.

[0044] Furthermore, if Figure 1 and Figure 2 As shown, the backpack fire extinguishing device may include a control module 7 and an air pump interruption switch 5. The control module 7 is respectively connected to the air pump interruption switch 5, the water pump 10 and the air pump 9. The control module 7 is the central controller of the whole machine, connected to the power supply 6, and can receive and process the monitoring data sent by each sensor, and control the start and shut down of the execution components such as the air pump 9 and the water pump 10 according to the monitoring data. The air pump interruption switch 5 can be a button switch, and can control the air pump 9 to be turned on or off through the control module 7. That is, the control module 7 can obtain the switch signal of the air pump interruption switch 5, and determine and switch the working mode of the backpack fire extinguishing device according to the switch signal of the air pump interruption switch 5.

[0045] When the DC foam mist mode is needed, the air pump interruption switch 5 can be switched to the closed position. At this time, the control module 7 obtains the closing signal of the air pump interruption switch 5 and determines to use the DC foam mist mode. Then, the subsequent control module 7 can control the opening or closing of the air pump 9 under the air pump start-up condition or the air pump shutdown condition; when the fine water mist mode is needed, the air pump interruption switch 5 can be switched to the open position to shut down the air pump 9. At this time, the control module 7 obtains the opening signal of the air pump interruption switch 5 and determines to use the fine water mist mode. Then, the air pump 9 will not be started in the subsequent control process. Specifically, after the backpack fire extinguishing device is started for the first time, the control module 7 is configured as follows:

[0046] Determine that the air pump interruption switch 5 is in the off position, and control the water pump 10 and the air pump 9 to start;

[0047] Determine that the air pump interruption switch 5 is in the on position, control the air pump 9 to be turned off, and control the water pump 10 to be started.

[0048] In this way, the control module 7 can determine that the air pump interruption switch 5 is in the closed position by obtaining the closing signal of the air pump interruption switch 5, and determine that the air pump interruption switch 5 is in the open position by obtaining the opening signal of the air pump interruption switch 5. After determining that the air pump interruption switch 5 is in the closed position, the start or shut down of the air pump 9 can be controlled. Among them, when it is determined that the air pump interruption switch 5 is in the closed position, the water pump 10 can be controlled to start and then the air pump 9 can be controlled to start, or the air pump 9 can also be set to start synchronously with the water pump 10.

[0049] In some specific embodiments, the backpack fire extinguishing device further includes a detection module, which is used to detect the working parameters of at least one of the liquid storage tank 1, the spraying device 14, or the pipeline between the mixing device 11 and the spraying device 14. The control module 7 is further configured as follows:

[0050] Determine that the water pump 10 is in the starting state;

[0051] Obtain working parameters detected by the detection module;

[0052] Determining that the operating parameter is outside the preset threshold range, and controlling the water pump 10 to stop;

[0053] It is determined that the operating parameter is within the preset threshold range, and the water pump 10 is controlled to remain in the started state.

[0054] In this way, the backpack fire extinguishing device can be ensured to operate safely and reliably, and the equipment damage rate of the backpack fire extinguishing device can be reduced. Among them, the detection module may include at least one of the pressure detector 12, the liquid level detector 3 and the flow detection device. Accordingly, the working parameters may be multiple and include at least one of the working pressure of the pipeline between the mixing device 11 and the spraying device 14, the liquid level of the liquid storage tank 1 and the flow rate of the outlet of the spraying device 14. When at least one working parameter is outside the preset threshold range, the water pump 10 is controlled to stop; when all working parameters are within the preset threshold range, the water pump 10 is controlled to remain in the started state.

[0055] Optionally, the detection module may include a pressure detector 12, which is disposed on the pipeline between the mixing device 11 and the ejection device 14. The pressure detector 12 is a pressure sensor and is used to detect the working pressure in the pipeline. The pressure detector 12 is connected to the control module 7 for communication and sends monitoring data to the control module 7. The control module 7 may be configured as follows:

[0056] Determine that the water pump 10 is in the starting state;

[0057] Get the working pressure in the pipeline;

[0058] Determine that the working pressure detected by the pressure detector 12 is higher than a preset working pressure threshold, and control the water pump 10 to stop;

[0059] It is determined that the working pressure detected by the pressure detector 12 is lower than or equal to the preset working pressure threshold, and the water pump 10 is controlled to remain in the started state.

[0060] Optionally, the detection module may include a liquid level detector 3 that is communicatively connected to the control module 7, and the liquid level detector 3 is disposed in the liquid storage tank 1 and is used to detect the liquid level in the liquid storage tank 1. Figure 1 As shown, the liquid level detector 3 is a liquid level sensor and is installed at the bottom of the liquid storage tank 1. It can monitor the liquid level inside the liquid storage tank 1 and send the monitoring data to the control module 7. The control module 7 is configured as follows:

[0061] Determine that the water pump 10 is in the starting state;

[0062] Get the liquid level in liquid storage tank 1;

[0063] Determine that the liquid level detected by the liquid level detector 3 is lower than a preset liquid level threshold, and control the water pump 10 to stop;

[0064] It is determined that the liquid level detected by the liquid level detector 3 is higher than or equal to a preset liquid level threshold, and the water pump 10 is controlled to remain in the started state.

[0065] Furthermore, after the backpack fire extinguishing device is initially started, the control module 6 is configured to:

[0066] After determining that the air pump interruption switch 5 is in the closed position and controlling the water pump 10 to stop, the air pump 9 is controlled to stop.

[0067] Optionally, the detection module may include a flow detection device, which is disposed in the outlet of the ejection device 14 and is used to detect the flow rate of the outlet, and the control module 7 is communicatively connected to the flow detection device and is configured as follows:

[0068] Determine that the water pump 10 is in the starting state;

[0069] Get the nozzle flow rate;

[0070] Determine that the flow rate of the spray outlet is less than a preset flow rate threshold, and control the water pump 10 to stop;

[0071] Determine that the flow rate at the spray outlet is greater than or equal to a preset flow rate threshold, and control the water pump 10 to remain in the started state.

[0072] In this way, the start and stop of the electric water pump and the micro air pump can be controlled by the monitoring data of the liquid level detector 3, the pressure detector 12 and the flow detection device, thereby saving the power consumption of the whole machine while ensuring the safety of the whole machine.

[0073] In some specific embodiments, the backpack fire extinguishing device may further include a prompt module 8, which is connected to the control module 7 and can send corresponding sound or light prompt signals to prompt the user of insufficient liquid level, insufficient power, power on / off, etc. according to the communication signals of the liquid level detector 3, power supply 6, start switch, etc. acquired by the control module 7. The prompt module 8 can be a voice prompt module, an indicator light, a buzzer, etc.

[0074] Optionally, the backpack fire extinguishing device may further include a power supply 6 and a start switch 4. The power supply 6 is electrically connected to the water pump 10 and the air pump 9, respectively, to supply power to the water pump 10 and the air pump 9. The start switch 4 is communicatively connected to the control module 7, and the start switch 4 may be a button switch. Among them, the prompt module 8, the air pump 9, the water pump 10, the liquid level detector 3, the pressure detector 12, etc. are load modules, and the start switch 4 can control the start or shut down of the load module of the whole machine through the control module 7, that is, the start switch 4 can control the opening or closing of the air pump 9 and the water pump 10 through the control module 7. The control module 7 can determine that the start switch 4 is in the closed position by obtaining the closing signal of the start switch 4, and determine that the start switch 4 is in the open position by obtaining the opening signal of the start switch 4. The control module 7 can be further configured as:

[0075] After the water pump 10 is controlled to stop and the start switch 4 is determined to be in the off position, the electrical connection between the power supply 6 and the air pump 9 and the water pump 10 is controlled to be cut off;

[0076] After the water pump 10 is controlled to stop and it is determined that the start switch 4 is in the open position, the working pressure detected by the pressure detector 12 and the liquid level detected by the liquid level detector 3 are obtained.

[0077] The control cuts off the electrical connection between the power supply 6 and the air pump 9 and the water pump 10, that is, the power supply 6 cannot supply power to the air pump 9 and the water pump 10. The power supply 6 can provide power for the whole machine operation and can use rechargeable batteries such as lithium-ion batteries, lead-acid batteries, nickel-cadmium batteries, etc., and the installation method is designed as a pull-out quick-change structure. In addition to being a replaceable battery installation structure, the power supply 6 can also be a fixed charging structure, which is charged using a charging port.

[0078] Specifically, Figure 2 As shown, the control method of the two working modes of the backpack fire extinguishing device of the present application will be illustrated below.

[0079] Control method of DC foam mist mode: After the whole machine is started, if the user does not turn on the air pump interruption switch 5, the water pump 10 will start immediately, and the air pump 9 will start next. At the same time, the liquid level detector 3 and the pressure detector 12 work to monitor the liquid level in the liquid storage tank 1 and the working pressure detected by the pressure detector 12 respectively, and send the monitoring data to the control module 7 in time. The control module 7 determines whether the liquid level is lower than the set threshold value based on the received data. The preferred liquid level threshold is the liquid level height corresponding to 3% to 5% of the total volume of the liquid storage tank 1. When it is lower than the set liquid level threshold, the water pump 10 is controlled to pause and the air pump 9 is suspended. The control module 7 will also determine whether the working pressure (i.e., the whole machine pressure) detected by the pressure detector 12 is higher than the set threshold. The preferred working pressure threshold is 0.8MPa. When it is higher than the set pressure threshold, the water pump 10 will also be controlled to pause and the air pump 9 will be suspended. Further, the control module 7 determines whether the start switch 4 is turned off. If the start switch 4 is turned off, the whole machine is controlled to be powered off and shut down, and the control process ends; if the start switch 4 is not turned off, the liquid level in the liquid storage tank and the working pressure detected by the pressure detector 12 are continuously monitored and determined. Only when the liquid level in the liquid storage tank 1 is higher than the set liquid level threshold, and the working pressure detected by the pressure detector 12 is lower than the set pressure threshold, the control module 7 will control the water pump 10 to restart, and the air pump 9 to restart, and the monitoring and determination are circulated in sequence.

[0080] Control method of fine water mist mode: After the whole machine is started, if the user turns on the air pump interruption switch 5, the system controls the air pump 9 not to start, and only the water pump 10 starts separately. At the same time, the liquid level detector 3 and the pressure detector 12 work to monitor the liquid level in the liquid storage tank 1 and the working pressure detected by the pressure detector 12 respectively, and send the monitoring data to the control module 7 in time. The control module 7 determines whether the liquid level is lower than the set threshold value based on the received data. The preferred liquid level threshold is the liquid level height corresponding to 3% to 5% of the total volume of the liquid storage tank 1. When it is lower than the set liquid level threshold, the water pump 10 is controlled to pause. The control module 7 will also determine whether the working pressure (i.e., the whole machine pressure) detected by the pressure detector 12 is higher than the set threshold. The preferred whole machine pressure threshold is 0.8MPa. When it is higher than the set pressure threshold, the water pump 10 will also be controlled to pause. Furthermore, the control module 7 determines whether the starting switch 4 is turned off. If the starting switch 4 is turned off, the whole machine is controlled to be powered off and shut down, and the control process ends. If the starting switch 4 is not turned off, the liquid level in the liquid storage tank and the working pressure detected by the pressure detector 12 continue to be monitored and judged. Only when the liquid level in the liquid storage tank 1 is higher than the set liquid level threshold and the working pressure detected by the pressure detector 12 is lower than the set pressure threshold, the system will control the water pump 10 to restart, and the monitoring and judgment will be cyclically repeated.

[0081] It should be noted that in the two working modes of the backpack fire extinguishing device, when the whole machine is turned on and the spray device 14 is not turned on, the working pressure of the whole machine will rise. To ensure safety, the water pump and the air pump need to be controlled to stop. After the spray device 14 turns on the spray gun, the working pressure of the whole machine will be at a fixed value (the fixed value is lower than the set pressure threshold). When the liquid in the liquid storage tank 1 is about to be sprayed out, in order to prevent the water pump 10 from idling and being damaged, the water pump and the air pump need to be controlled to stop and remind the user to refill.

[0082] It can be understood by those skilled in the art that the principles and structures of components such as the prompt module 8, air pump 9, water pump 10, liquid level detector 3, pressure detector 12, direct current foam spraying structure and fine water mist spraying structure are well known to those skilled in the art and do not belong to the core improvement part of the present application, and therefore will not be elaborated here.

[0083] In summary, the backpack fire extinguishing device of the present application adopts electric drive, removes the high-pressure container used in the traditional backpack compressed air foam fire extinguishing device, and removes the high-pressure inflation operation of the gas cylinder, making the backpack compressed air foam fire extinguishing device safer and more convenient. In addition, the present application integrates the micro electric water pump and the micro air pump into the backpack fire extinguishing device, and through the system control method, the electric water pump is solely responsible for the injection of the mixed liquid, and the micro air pump is mainly for compressed air replenishment and mixing, and hardly participates in the drive, and only requires a small flow micro pump. This not only solves the problem that the traditional electric backpack fire extinguishing device cannot spray compressed air foam, but also reduces the weight of the whole machine to a certain extent. In addition, through the system control method, the present application realizes that the whole machine can spray compressed air foam, and can also spray ordinary negative pressure pumps to spray fine water mist or direct current foam. Users can choose the corresponding spray mode according to the actual fire extinguishing scene, with richer functions and wider application scenarios. In addition, the electric water pump and micro water pump are only continuously turned on when the whole machine is spraying. When the liquid level or pressure is insufficient, they will stop working, saving energy consumption and increasing the endurance of the whole machine.

[0084] In the description of the present application, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present application, "plurality" means at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0085] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0086] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0087] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A backpack fire extinguishing device, characterized in that: include: Liquid storage tank(1); A mixing device (11); a water pump (10), wherein a liquid inlet of the water pump (10) is connected to the liquid storage tank (1), and a liquid outlet of the water pump (10) is connected to the mixing device (11) to supply liquid to the mixing device (11); an air pump (9), the air pump (9) being in communication with the mixing device (11) to supply compressed air to the mixing device (11); and A spraying device (14), the spraying device (14) is connected to the mixing device (11) and is used to spray compressed air foam.

2. The backpack fire extinguishing device according to claim 1, characterized in that: The backpack fire extinguishing device further comprises a control module (7) and an air pump interruption switch (5); the control module (7) is respectively connected to the air pump interruption switch (5), the water pump (10) and the air pump (9) for communication and is used to control the start or shut down of the water pump (10) and the air pump (9) according to a switch signal of the air pump interruption switch (5).

3. The backpack fire extinguishing device according to claim 2, characterized in that: The backpack fire extinguishing device further comprises a pressure detector (12) which is communicatively connected to the control module (7); the pressure detector (12) is arranged on a pipeline between the mixing device (11) and the spraying device (14) and is used to detect the working pressure in the pipeline; the control module (7) is further used to control the water pump (10) to stop or maintain the started state according to the started state of the water pump (10) and the working pressure detected by the pressure detector (12).

4. The backpack fire extinguishing device according to claim 2, characterized in that: The backpack fire extinguishing device further comprises a liquid level detector (3) which is communicatively connected to the control module (7); the liquid level detector (3) is arranged in the liquid storage tank (1) and is used to detect the liquid level in the liquid storage tank (1); the control module (7) is further used to control the water pump (10) to stop or maintain the started state according to the started state of the water pump (10) and the liquid level detected by the liquid level detector (3).

5. The backpack fire extinguishing device according to claim 3 or 4, characterized in that: The backpack fire extinguishing device further comprises a power supply (6) and a start switch (4), wherein the power supply (6) is used to supply power to the water pump (10) and the air pump (9), and the start switch (4) is communicatively connected with the control module (7), and the control module (7) is further used to control the power supply state of the power supply (6) according to a switch signal of the start switch (4) after controlling the water pump (10) to stop.

6. The backpack fire extinguishing device according to claim 2, characterized in that: The spraying device (14) comprises a direct current foam spraying structure and a fine water mist spraying structure which can be switched for use, the direct current foam spraying structure is used to spray the compressed air foam, and the fine water mist spraying structure is used to spray the fine water mist.

7. The backpack fire extinguishing device according to claim 1, characterized in that: The air pump (9) is an electric diaphragm pump or an electric piston pump.

8. The backpack fire extinguishing device according to claim 1, characterized in that: The flow rate of the air pump (9) is 50L / min to 180L / min.

9. The backpack fire extinguishing device according to claim 1, characterized in that: The mixing device (11) has a foaming chamber disposed therein, the foaming chamber being configured as a Venturi tube structure with a narrowed middle tube section, the two tube ends of the foaming chamber being connected between the liquid outlet of the water pump (10) and the spraying device (14), and the middle tube section of the foaming chamber having an air inlet hole connected to the air outlet of the air pump (9).

10. The backpack fire extinguishing device according to claim 9, characterized in that: The mixing device (11) is provided with a safety pressure relief valve (15) connected to the foaming chamber.

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