Foam fire fighting truck with automatic flowmeter calibration function

Abstract

The utility model relates to a foam fire truck with an automatic flowmeter calibration function. The foam fire fighting truck with the automatic flowmeter calibration function comprises a water tank, a foam pipe, a communicating pipeline and a control device, and when the foam fire fighting truck is used, after the control device receives a user instruction for calibrating an impeller flowmeter, the impeller flowmeter can be calibrated by controlling opening and closing of a tank water outlet valve, a tank foam outlet valve, a calibration valve, pressure water, a fire monitor and a fire pump; and the working state of the foam fire fighting truck with the flowmeter automatic calibration function is switched to a fire extinguishing state or a flowmeter calibration state. According to the foam fire truck with the flow meter automatic calibration function, a worker only needs to input an instruction to the control device, automatic calibration of the impeller flow meter can be achieved, the calibration work of the impeller flow meter is greatly simplified, and the calibration efficiency is improved. And the control device automatically calibrates the impeller flow meter through actual flow data collected by the impeller flow meter and a standard flow meter collected by the electromagnetic flow meter, so that the reliability of flow calibration work is effectively improved.

Description

Technical Field

[0001] This utility model relates to the field of fire truck technology, and in particular to a foam fire truck with automatic flow meter calibration function. Background Technology

[0002] The flow meters used in existing foam systems to detect foam liquid flow and water flow are basically impeller flow meters. Before use, they must be manually calibrated multiple times on a standard electromagnetic flow meter on a test bench, and the calibration coefficients must be filled in multiple times. The operation is complicated and inconvenient. Utility Model Content

[0003] Therefore, it is necessary to provide a foam fire truck with automatic flow meter calibration function that can reduce the flow meter calibration operation and improve calibration reliability.

[0004] A foam fire truck with automatic flow meter calibration function includes a water tank with an outlet, a foam tank with a foam outlet, connecting pipelines and control devices.

[0005] The connecting pipeline includes a first water pipe with a tank outlet valve, a first foam pipe, a first fire-fighting pipe, a first return pipe, a second return pipe with a pressure valve, a calibration pipe with a calibration valve, a fire pump, a venturi pipe, and a fire monitor; one end of the first water pipe is connected to the outlet, and the other end is connected to the inlet of the fire pump and one end of the first return pipe; one end of the first fire-fighting pipe is connected to the outlet of the fire pump and one end of the second return pipe, and the other end is connected to the inlet of the fire monitor; both ends of the venturi pipe are connected to the other end of the second return pipe and the first return pipe, respectively. The other end of the pipe is connected; one end of the first foam pipe is connected to the foam outlet, and the other end is connected to the inlet of the venturi tube; both ends of the calibration pipe are connected to the first fire-fighting pipe and the first foam pipe, respectively; a foam outlet valve is provided at the end of the first foam pipe near the foam outlet, and an electromagnetic flow meter is provided at the end near the venturi tube; one end of the calibration pipe is connected to the part of the first foam pipe located between the foam outlet valve and the electromagnetic flow meter; an impeller flow meter is provided on the first fire-fighting pipe at the position between the calibration pipe and the fire pump;

[0006] The control device is connected to the tank outlet water valve, the tank outlet foam valve, the calibration valve, the pressurized water, the impeller flow meter, the electromagnetic flow meter, the fire monitor, and the fire pump, respectively. It is used to generate a preset control signal based on user instructions and control the opening and closing of the tank outlet water valve, the tank outlet foam valve, the calibration valve, the pressurized water, the fire monitor, and the fire pump according to the preset control signal, so as to switch the working state of the foam fire truck with automatic flow meter calibration function to the flow meter calibration state.

[0007] When the flow meter is in the calibration state, the fire pump and the calibration valve are both in the open state, and the fire monitor and the tank outlet foam valve are both in the closed state. The control device is also used to control the tank outlet valve to open until the standard flow data collected by the electromagnetic flow meter reaches the preset calibration level flow, at which point the tank outlet valve is controlled to close. After that, the impeller flow meter is calibrated according to the standard flow and the actual flow data collected by the impeller flow meter.

[0008] When the above-mentioned foam fire truck with automatic flow meter calibration function is in use, after receiving the user's instruction to calibrate the impeller flow meter, the control device can switch the working state of the foam fire truck with automatic flow meter calibration function to fire extinguishing state or flow meter calibration state by controlling the opening and closing of the tank outlet water valve, tank outlet foam valve, calibration valve, pressure water, fire monitor and fire pump. When the operating state is switched to the flow meter calibration state, the fire pump, the first fire pipe, the impeller flow meter, the calibration pipe, the calibration valve, the first foam pipe, the electromagnetic flow meter, the venturi pipe, the first return pipe, and the first water pipe are connected in sequence to form a calibration loop. At this time, the tank outlet valve is in the open state, and the water in the tank is drawn into the calibration loop by the action of the fire pump. When the electromagnetic flow meter collects the flow in the calibration loop and reaches the preset calibration level (e.g., 10L level, 20L level, 50L level, etc.), the control device controls the tank outlet valve to close, and then calibrates the impeller flow meter according to the actual flow data collected by the impeller flow meter and the standard flow data collected by the electromagnetic flow meter. Therefore, with the aforementioned foam fire truck equipped with automatic flow meter calibration function, operators only need to input a command into the control device to achieve automatic calibration of the impeller flow meter, which greatly simplifies the calibration work. Furthermore, the control device automatically calibrates the impeller flow meter by using the actual flow data collected by the impeller flow meter and the standard flow data collected by the electromagnetic flow meter, effectively improving the reliability of the flow calibration work. Attached Figure Description

[0009] Figure 1 This is a schematic diagram of the structure of a foam fire truck with automatic flow meter calibration function in a preferred embodiment of the present invention;

[0010] Figure 2 for Figure 1 The diagram shows the structure of the calibration circuit in a foam fire truck with automatic flow meter calibration function.

[0011] Explanation of reference numerals in the detailed implementation: 10. Foam fire truck with automatic flow meter calibration function; 100. Water tank; 200. Foam tank; 300. Connecting pipeline; 310. Tank outlet valve; 320. First water pipe; 330. First foam pipe; 340. First fire pipe; 350. First return pipe; 360. Pressure water valve; 370. Second return pipe; 380. Calibration valve; 390. Calibration pipe; 3010. Fire pump; 3020. Venturi tube; 3030. Fire monitor; 3040. Foam outlet from tank. Valve; 3050, Electromagnetic flowmeter; 3060, Impeller flowmeter; 3070, Return valve; 3080, Return pipe; 3090, Flushing pipe; 31010, Flushing valve; 31020, External suction valve; 31030, Second water pipe; 31040, External suction foam valve; 31050, Second foam pipe; 31060, Liquid discharge control valve; 31070, Second fire-fighting pipe; 31071, Main pipe; 31072, Branch pipe; 31080, Electrically controlled valve; 31090, Water injection valve; 32010, Water injection pipe. Detailed Implementation

[0012] To facilitate understanding of this utility model, a more complete description will be given below with reference to the accompanying drawings. Preferred embodiments of this utility model are shown in the drawings. However, this utility model can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the disclosure of this utility model.

[0013] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0014] When describing positional relationships, unless otherwise specified, when an element is referred to as being "on" another element, it may be directly on the other element or there may be intermediate elements. It is also understood that when an element is referred to as being "between" two elements, it may be the only one between the two elements, or there may be one or more intermediate elements.

[0015] When using the terms “including,” “having,” and “comprising” as described herein, another component may be added unless explicitly qualifying terms such as “only,” “consisting of,” etc. are used. Unless otherwise stated, singular terms may include plural forms and should not be construed as having a quantity of one.

[0016] Figure 1The diagram illustrates the structure of a foam fire truck with automatic flow meter calibration function according to an embodiment of the present invention. For ease of explanation, the accompanying drawings only show structures relevant to the embodiment of the present invention.

[0017] Please see Figure 1 The foam fire truck 10 with automatic flow meter calibration function in the preferred embodiment of this utility model includes a water tank 100, a foam tank 200, a connecting pipeline 300 and a control device (not shown).

[0018] Water tank 100 has an outlet (not shown in the figure). Foam tank 200 has a foam outlet (not shown in the figure). Connecting pipeline 300 includes a first water pipe 320 with a tank outlet valve 310, a first foam pipe 330, a first fire-fighting pipe 340, a first return pipe 350, a second return pipe 370 with a pressure water valve 360, a calibration pipe 390 with a calibration valve 380, a fire pump 3010, a venturi pipe 3020, and a fire monitor 3030. One end of the first water pipe 320 is connected to the outlet, and the other end is connected to the inlet of the fire pump 3010 and one end of the first return pipe 350. One end of the first fire-fighting pipe 340 is connected to the outlet of the fire pump 3010 and one end of the second return pipe 370, and the other end is connected to the inlet of the fire monitor 3030. Both ends of the venturi pipe 3020 are connected to the other ends of the second return pipe 370 and the first return pipe 350, respectively. One end of the first foam pipe 330 is connected to the foam outlet, and the other end is connected to the suction inlet of the venturi tube 3020. The two ends of the calibration pipe 390 are connected to the first fire-fighting pipe 340 and the first foam pipe 330, respectively. A canister foam valve 3040 is installed at the end of the first foam pipe 330 near the foam outlet, and an electromagnetic flow meter 3050 is installed at the end near the venturi tube 3020. One end of the calibration pipe 390 is connected to the portion of the first foam pipe 330 located between the canister foam valve 3040 and the electromagnetic flow meter 3050. An impeller flow meter 3060 is installed on the first fire-fighting pipe 340 between the calibration pipe 390 and the fire pump 3010.

[0019] The control device is connected to the tank outlet water valve 310, tank outlet foam valve 3040, calibration valve 380, pressurized water, impeller flow meter 3060, electromagnetic flow meter 3050, fire monitor 3030 and fire pump 3010 respectively, and is used to generate preset control signals based on user instructions, and control the opening and closing of the tank outlet water valve 310, tank outlet foam valve 3040, calibration valve 380, pressurized water, fire monitor 3030 and fire pump 3010 according to the preset control signals, so as to switch the working state of the foam fire truck 10 with automatic flow meter calibration function to the flow meter calibration state.

[0020] When the flow meter is in calibration mode, the fire pump 3010 and calibration valve 380 are both in the open state, while the fire monitor 3030 and tank outlet foam valve 3040 are both in the closed state. The control device is also used to control the opening of the tank outlet valve 310 until the standard flow data collected by the electromagnetic flow meter 3050 reaches the preset calibration level flow, at which point the tank outlet valve 310 is controlled to close. After that, the impeller flow meter 3060 is calibrated based on the standard flow and the actual flow data collected by the impeller flow meter 3060.

[0021] Specifically, the process of calibrating the impeller flowmeter 3060 using standard flow data and actual flow data is as follows: the control device calculates the difference between the standard flow data and the actual flow data to obtain a calibration coefficient; the control device applies the calibration coefficient to the impeller flowmeter 3060 to calibrate the impeller flowmeter 3060; the calibrated impeller flowmeter 3060 is used to collect actual flow data again; the control device again calculates the difference between the collected actual flow data and the standard flow data to obtain a calibration coefficient; if the absolute value of the calibration coefficient is greater than the preset error value, the control device repeats the above calibration process; if the absolute value of the calibration coefficient is less than or equal to the preset error value, it indicates that the calibration of the impeller flowmeter 3060 is complete.

[0022] It should be noted that the electromagnetic flowmeter 3050, due to its non-contact measurement, durable materials, and stable principle, inherently possesses the advantage of a longer calibration cycle, which is usually several years. Therefore, the electromagnetic flowmeter 3050 can be used as a standard flowmeter for calibrating the impeller flowmeter 3060. Foam fire trucks equipped with automatic flowmeter calibration functions only need to periodically calibrate the electromagnetic flowmeter 3050 using a flowmeter calibration instrument within its calibration cycle.

[0023] In practical applications, the control device, based on received user commands, controls the opening and closing of the tank outlet valve 310, tank outlet foam valve 3040, calibration valve 380, pressurized water valve, fire monitor 3030, and fire pump 3010 to switch the working state of the foam fire truck 10 with automatic flowmeter calibration function to either fire extinguishing state or flowmeter calibration state. When the foam fire truck 10 with automatic flowmeter calibration function is in fire extinguishing state, the tank outlet valve 310, fire pump 3010, fire monitor 3030, tank outlet foam valve 3040, and pressurized water valve 360 ​​are all open, while the calibration valve 380 is closed. Therefore, the aforementioned foam fire truck 10 with automatic flowmeter calibration function possesses both fire extinguishing function and automatic calibration function for the impeller flowmeter 3060.

[0024] Please refer to the following: Figure 2When the impeller flowmeter 3060 needs to be calibrated, after receiving the user instruction to calibrate the impeller flowmeter 3060, the control device can switch the working state of the foam fire truck 10 with automatic flowmeter calibration function to the flowmeter calibration state by controlling the opening and closing of the tank outlet valve 310, the tank outlet foam valve 3040, the calibration valve 380, the pressurized water, the fire monitor 3030, and the fire pump 3010. Compared with manual calibration, the operation is simpler. When the operating state is switched to the flow meter calibration state, the fire pump 3010, the first fire pipe 340, the impeller flow meter 3060, the calibration pipe 390, the calibration valve 380, the first foam pipe 330, the electromagnetic flow meter 3050, the venturi tube 3020, the first return pipe 350, and the first water pipe 320 are sequentially connected to form a calibration circuit. At this time, the tank outlet valve 310 is in the open state, and the water in the water tank 100 is drawn into the calibration circuit by the action of the fire pump 3010. After the magnetic flowmeter 3050 detects that the flow rate in the calibration circuit has reached the preset calibration level (e.g., 10L, 20L, 50L, etc.), the control device closes the outlet valve 310 of the control tank. Then, based on the actual flow data collected by the impeller flowmeter 3060 and the standard flow data collected by the electromagnetic flowmeter 3050, the impeller flowmeter 3060 is calibrated. Therefore, the foam fire truck 10 with automatic flowmeter calibration function has an automatic calibration function for the impeller flowmeter 3060. In actual use, the control device can automatically calibrate all or some flow levels of the impeller flowmeter 3060 by repeating the above flowmeter calibration process multiple times.

[0025] Therefore, with the foam fire truck 10 equipped with automatic flow meter calibration function, the operator only needs to input a command into the control device to achieve automatic calibration of the impeller flow meter 3060, which greatly simplifies the calibration work of the impeller flow meter 3060. Moreover, the control device automatically calibrates the impeller flow meter 3060 by using the actual flow data collected by the impeller flow meter 3060 and the standard flow data collected by the electromagnetic flow meter 3050, which effectively improves the reliability of the flow calibration work.

[0026] In some embodiments, the connecting pipe 300 further includes a return pipe 3080 with a return valve 3070. The water tank 100 also has a return port (not shown). The two ends of the return pipe 3080 are connected to the end of the first fire pipe 340 near the fire monitor 3030 and the return port, respectively. A control device is connected to the return valve 3070 and is used to control the return valve 3070 to open when the absolute value of the difference between the standard flow data and the actual flow data is less than or equal to a preset error value.

[0027] Specifically, when the foam fire truck 10 with automatic flow meter calibration function is in fire extinguishing mode, the return valve 3070 is in the closed state; when the foam fire truck 10 with automatic flow meter calibration function is in flow meter calibration mode, during the process of injecting water into the calibration circuit and circulating water in the calibration circuit to automatically calibrate the impeller flow meter 3060, the return valve 3070 is always in the closed state until the absolute value of the difference between the quasi-flow data and the actual flow data is less than or equal to the preset error value (that is, the calibration work of the current flow level of the impeller flow meter 3060 is completed), the return valve 3070 opens, so that the water in the calibration circuit is returned to the water tank 100 through the return pipe 3080 to realize the reuse of liquid.

[0028] Of course, in other embodiments, when the calibration of the impeller flow meter 3060 at the current flow rate is completed, the fire monitor 3030 or similar device can be turned on to drain the water in the calibration circuit.

[0029] In one embodiment of this utility model, the control device is further configured to control the opening and closing of the tank outlet valve 310, the tank outlet foam valve 3040, the calibration valve 380, and the pressure water valve 360 ​​according to a preset control signal, so as to switch the working state of the foam fire truck 10 with automatic flow meter calibration function to the flushing state. In the flushing state, the fire pump 3010, the tank outlet valve 310, the calibration valve 380, and the fire monitor 3030 are all in the open state, while the tank outlet foam valve 3040 and the pressure water valve 360 ​​are all in the closed state.

[0030] The foam fire truck 10 with automatic flow meter calibration function also has an automatic flushing function. When in flushing mode, the fire pump 3010 draws water from the water tank 100 into the first fire pipe 340. A portion of the water in the first fire pipe 340 enters the first foam pipe 330 through the return pipe 3080 to clean the first foam pipe 330. Then, the water in the first water pipe 320 enters the first fire pipe 340 again through the venturi pipe 3020. The other portion of the water in the first fire pipe 340 is discharged directly through the fire monitor 3030. This achieves automatic cleaning of the first foam pipe 330 and the venturi pipe 3020, solving the problem of corrosion caused by foam stored in the first fire pipe 340 and the venturi pipe 3020 for a long time. The operation is simple and helps to extend the service life of the foam fire truck 10 with automatic flow meter calibration function.

[0031] In another embodiment of this utility model, the connecting pipe 300 further includes a flushing pipe 3090 with a flushing valve 31010. The two ends of the flushing pipe 3090 are respectively connected to the first fire pipe 340 and the first foam pipe 330 at the part between the can outlet foam valve 3040 and the venturi pipe 3020.

[0032] The control device is also connected to the flushing valve 31010 and is used to control the opening and closing of the tank outlet valve 310, tank outlet foam valve 3040, calibration valve 380, pressure water valve 360, and flushing valve 31010 according to a preset control signal, so as to switch the working state of the foam fire truck 10 with automatic flow meter calibration function to the flushing state. When in the flushing state, the fire pump 3010, tank outlet valve 310, fire monitor 3030, and flushing valve 31010 are all in the open state, while the tank outlet foam valve 3040, pressure water valve 360, and calibration valve 380 are all in the closed state.

[0033] Similarly, the foam fire truck 10 with automatic flow meter calibration function has an automatic flushing function. When in use, the operator only needs to input a command to flush the foam into the control device to automatically flush the foam in the first foam pipe 330 and the venturi pipe 3020, thereby extending the service life of the foam fire truck 10 with automatic flow meter calibration function.

[0034] In some embodiments, the connecting pipe 300 further includes a second water pipe 31030 with an external suction valve 31020. One end of the second water pipe 31030 is connected to the portion of the first water pipe 320 located between the tank outlet valve 310 and the venturi tube 3020. The control device is connected to the external suction valve 31020 and is used to control the opening of the tank outlet valve 310 or the external suction valve 31020 in the flow meter calibration state until the standard flow data collected by the electromagnetic flow meter 3050 reaches the preset calibration level flow, at which point the control device closes the tank outlet valve 310 or the external suction valve 31020.

[0035] When the foam fire truck 10 with automatic flow meter calibration function is in fire extinguishing function, one of the tank outlet valve 310 and the external suction valve 31020 is in the open state and the other is in the closed state; when the foam fire truck 10 with automatic flow meter calibration function is in automatic flushing state, one of the tank outlet valve 310 and the external suction valve 31020 is in the open state and the other is in the closed state.

[0036] Therefore, during the use of the foam fire truck 10 with automatic flow meter calibration function, the staff can choose to open the tank outlet valve 310 or the external suction valve 31020 according to the actual situation on site. This allows the foam fire truck 10 with automatic flow meter calibration function to be used normally in places with or without water source. In the event of a large fire, the external suction valve 31020 can also be used to connect to the surrounding water source, thereby improving the applicability of the foam fire truck 10 with automatic flow meter calibration function.

[0037] In some embodiments, the connecting pipe 300 further includes a second foam pipe 31050 with an external suction foam valve 31040. One end of the second foam pipe 31050 is connected to the portion of the first foam pipe 330 located between the can outlet foam valve 3040 and the electromagnetic flow meter 3050. The control device is connected to the external suction foam valve and can selectively control one or both of the can outlet foam valve 3040 and the external suction foam valve 31040 to be closed.

[0038] Specifically, when the foam fire truck 10 with automatic flow meter calibration function is in fire extinguishing mode, one of the foam outlet valve 3040 and the external suction foam valve 31040 is in the open state and the other is in the closed state; when the foam fire truck 10 with automatic flow meter calibration function is in flow meter calibration mode, both the foam outlet valve 3040 and the external suction foam valve 31040 are in the closed state; when the foam fire truck 10 with automatic flow meter calibration function is in automatic flushing mode, both the foam outlet valve 3040 and the external suction foam valve 31040 are in the closed state.

[0039] Thus, the foam fire truck 10 with automatic flow meter calibration function can choose to use the foam in the foam tank 200 for fire extinguishing or connect to other external foam sources for fire extinguishing during the fire extinguishing process, making the use of the foam fire truck 10 with automatic flow meter calibration function more flexible, convenient and reliable.

[0040] In some embodiments, the connecting pipe 300 further includes a second fire pipe 31070 with a discharge control valve 31060. One end of the second fire pipe 31070 is connected to the first fire pipe 340. The control device is connected to the discharge control valve 31060 and is used to control the fire monitor 3030 and the discharge control valve 31060 to close when the flow meter is calibrated. During firefighting, the second fire pipe 31070 can directly discharge water or be connected to other fire spraying tools via the discharge control valve 31060.

[0041] Specifically, when the foam fire truck 10 with automatic flow meter calibration function is in fire extinguishing mode, the control device controls one or more of the fire monitor 3030 and the liquid discharge control valve 31060 to open; when the foam fire truck 10 with automatic flow meter calibration function is in flow meter calibration mode, the control device controls both the fire monitor 3030 and the liquid discharge control valve 31060 to close; when the foam fire truck 10 with automatic flow meter calibration function is in automatic flushing mode, the control device controls one or more of the fire monitor 3030 and the liquid discharge control valve 31060 to open.

[0042] Thus, the installation of the liquid discharge control valve 31060 and the second fire pipe 31070 allows the foam fire truck 10 with automatic flow meter calibration function to choose to activate the fire monitor 3030 alone for fire extinguishing in the fire extinguishing state, or to activate the fire monitor 3030 and the liquid discharge control valve 31060 at the same time for fire extinguishing, so as to improve the fire extinguishing efficiency.

[0043] Furthermore, in some embodiments, the second fire-fighting pipe 31070 includes a main pipe 31071 and a plurality of branch pipes 31072 connected to one end of the main pipe 31071. The end of the main pipe 31071 away from the branch pipes 31072 is connected to the first fire-fighting pipe 340. Each branch pipe 31072 is provided with a liquid discharge control valve 31060. Thus, by configuring the second fire-fighting pipe 31070 as a main pipe 31071 and a plurality of branch pipes 31072, and configuring a plurality of liquid discharge control valves 31060, the foam fire truck 10 with automatic flow meter calibration function can selectively activate the fire monitor 3030 and one or more of the plurality of liquid discharge control valves 31060 to extinguish the fire in the fire-fighting state.

[0044] In some embodiments, an electrically controlled valve 31080 is provided at the end of the first foam tube 330 near the venturi tube 3020. A control device is connected to the electrically controlled valve 31080. The electrically controlled valve 31080 is in the open state during fire extinguishing. The electrically controlled valve 31080 is also in the open state during flow meter calibration. The electrically controlled valve 31080 allows for precise control of the foam flow rate entering the venturi tube 3020, thereby obtaining a foam and water mixture capable of efficient fire extinguishing.

[0045] In some embodiments, the water tank 310 also has a water inlet (not shown). The connecting pipe 300 also includes a water inlet pipe 32010 with a water inlet valve 31090. One end of the water inlet pipe 32010 is connected to the water inlet. Thus, the water inlet pipe 32010 and the water inlet valve 31090 are provided to facilitate the addition of water to the water tank 310, making the water filling operation time-saving and labor-saving, and improving the ease of use of the foam fire truck 10 with automatic flow meter calibration function.

[0046] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0047] The above-described embodiments are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the inventive concept, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A foam fire fighting vehicle with automatic calibration of flow meter, characterized in that, The application relates to a foam fire fighting vehicle with automatic flow meter calibration function, which comprises a water tank with a water outlet, a foam tank with a foam outlet, a communication pipeline and a control device. The communication pipeline comprises a first water pipe with a tank water outlet valve, a first foam pipe, a first fire fighting pipe, a first liquid return pipe, a second liquid return pipe with a pressure water valve, a calibration pipe with a calibration valve, a fire fighting pump, a Venturi tube and a fire fighting gun; one end of the first water pipe is communicated with the water outlet, and the other end is communicated with the inlet of the fire fighting pump and one end of the first liquid return pipe; one end of the first fire fighting pipe is communicated with the outlet of the fire fighting pump and one end of the second liquid return pipe, and the other end is communicated with the inlet of the fire fighting gun; the two ends of the Venturi tube are communicated with the other end of the second liquid return pipe and the other end of the first liquid return pipe; one end of the first foam pipe is communicated with the foam outlet, and the other end is communicated with the suction inlet of the Venturi tube; the two ends of the calibration pipe are communicated with the first fire fighting pipe and the first foam pipe; one end of the first foam pipe close to the foam outlet is provided with a tank foam outlet valve, and one end close to the Venturi tube is provided with an electromagnetic flow meter; one end of the calibration pipe is communicated with the first foam pipe between the tank foam outlet valve and the electromagnetic flow meter; the first fire fighting pipe is provided with an impeller flow meter at a position between the calibration pipe and the fire fighting pump; The control device is connected with the tank water outlet valve, the tank foam outlet valve, the calibration valve, the pressure water, the impeller flow meter, the electromagnetic flow meter, the fire fighting gun and the fire fighting pump, and is used for generating preset control signals based on user instructions, and controlling the tank water outlet valve, the tank foam outlet valve, the calibration valve, the pressure water, the fire fighting gun and the fire fighting pump to open and close according to the preset control signals, so as to switch the working state of the foam fire fighting vehicle with automatic flow meter calibration function to a flow meter calibration state; When in the flow meter calibration state, the fire fighting pump and the calibration valve are in the open state, the fire fighting gun and the tank foam outlet valve are in the closed state, and the control device is further used for controlling the tank water outlet valve to open, and controlling the tank water outlet valve to close when the standard flow data collected by the electromagnetic flow meter reaches preset calibration position flow, and then calibrating the impeller flow meter according to the standard flow and actual flow data collected by the impeller flow meter.

2. Foam fire fighting vehicle with automatic calibration function of the flowmeter according to claim 1, characterized in that, The communication pipeline further comprises a backflow pipe with a backflow valve; the water tank further has a backflow port; the two ends of the backflow pipe are communicated with one end of the first fire fighting pipe close to the fire fighting gun and the backflow port; The control device is connected with the backflow valve, and is used for controlling the backflow valve to open when the absolute value of the difference between the standard flow data and the actual flow data is less than or equal to a preset error value.

3. The foam fire truck with automatic calibration function of flow meter according to claim 1, characterized in that, The control device is further used for controlling the tank water outlet valve, the tank foam outlet valve, the calibration valve and the pressure water valve to open and close according to the preset control signals, so as to switch the working state of the foam fire fighting vehicle with automatic flow meter calibration function to a flushing state. In the flushing state, the fire pump, the tank outlet water valve, the calibration valve, and the fire monitor are all in the open state, and the tank outlet foam valve and the pressure water valve are both in the closed state.

4. The foam fire truck with automatic calibration function of flow meter according to claim 1, characterized in that, The communication pipeline further comprises a flushing pipe with a flushing valve; two ends of the flushing pipe are respectively connected with the first fire pipe and the first foam pipe at a position between the tank outlet foam valve and the Venturi tube; The control device is further connected with the flushing valve and is used for controlling the tank outlet water valve, the tank outlet foam valve, the calibration valve, the pressure water valve, and the flushing valve to open or close according to the preset control signal, so as to switch the working state of the foam fire truck with the flow meter automatic calibration function to the flushing state; In the flushing state, the fire pump, the tank outlet water valve, the fire monitor, and the flushing valve are all in the open state, and the tank outlet foam valve, the pressure water valve, and the calibration valve are all in the closed state.

5. The foam fire truck with automatic calibration functionality of flow meters of claim 1, wherein, The communication pipeline further comprises a second water pipe with an external water suction valve; one end of the second water pipe is connected with the first water pipe at a position between the tank outlet water valve and the Venturi tube; the control device is connected with the external water suction valve and is used for controlling the tank outlet water valve or the external water suction valve to open in the flow meter calibration state, and controlling the tank outlet water valve or the external water suction valve to close when the standard flow data collected by the electromagnetic flow meter reaches the preset calibration range flow.

6. The foam fire truck with automatic calibration functionality of flow meters of claim 1, wherein, The communication pipeline further comprises a second foam pipe with an external foam suction valve; one end of the second foam pipe is connected with the first foam pipe at a position between the tank outlet foam valve and the electromagnetic flow meter; the control device is connected with the external foam suction valve and is used for selectively controlling one or all of the tank outlet foam valve and the external foam suction valve to close.

7. The foam fire truck with automatic calibration functionality of flow meters of claim 1, wherein, The communication pipeline further comprises a second fire pipe with a liquid outlet control valve; one end of the second fire pipe is connected with the first fire pipe; the control device is connected with the liquid outlet control valve and is used for controlling the fire monitor and the liquid outlet control valve to close in the flow meter calibration state.

8. The foam fire truck with automatic calibration function of flow meter according to claim 7, characterized in that, The second fire pipe comprises a main pipe and a plurality of branch pipes connected with one end of the main pipe; the end of the main pipe away from the branch pipes is connected with the first fire pipe; the liquid outlet control valve is arranged on each branch pipe.

9. The foam fire truck with automatic calibration functionality of the flow meter of claim 1, wherein, The first foam pipe is provided with an electric control valve at one end close to the Venturi tube; the control device is connected with the electric control valve; in the fire extinguishing state, the electric control valve is in the open state; in the flow meter calibration state, the electric control valve is in the open state.

10. The foam fire apparatus with automatic calibration functionality of flow meters of claim 1, wherein, The water tank is further provided with a water filling port; the communication pipeline further comprises a water filling pipe with a water filling valve; one end of the water filling pipe is connected with the water filling port.

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