Liquid level management device of fire fighting truck

Abstract

The utility model discloses a liquid level management device of a fire fighting truck. The fire fighting truck comprises a storage tank, a vehicle-mounted fire pump and an engine, wherein fire extinguishing liquid is stored in the storage tank, the vehicle-mounted fire pump is used for conveying the fire extinguishing liquid out of the storage tank along a pipeline, and the engine is used for providing kinetic energy for the vehicle-mounted fire pump. The liquid level management device comprises a liquid level meter and a controller. When the liquid level of the storage tank is lower than a preset value, the rotating speed of the engine can be reduced by controlling the engine to enter an idling state, so that the high temperature of the pump body caused by long-time high-speed operation or even idling of the vehicle-mounted fire pump in a state of less liquid supply is avoided, and the service life of the vehicle-mounted fire pump is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of fire trucks, in particular to a liquid level management device for fire trucks. Background Art

[0002] Water and foam liquid are the most important fire-fighting materials used by fire trucks in fire-fighting accidents, so it is necessary to pay real-time attention to the water and foam inventory on the fire truck storage tank. Patent CN 204831451 U discloses a water level display device in a fire truck, including a host, a liquid level transmitter, an in-vehicle display screen and an out-vehicle display screen. The liquid level transmitter is arranged on the top of the tank of the fire truck, the liquid level transmitter is connected to the host for communication, the host is connected to the in-vehicle display screen and the out-vehicle display screen for communication, the host, the liquid level transmitter, the in-vehicle display screen and the out-vehicle display screen are all powered by the vehicle battery, the liquid level transmitter transmits the collected water level signal to the host, and the host controls the in-vehicle display screen and the out-vehicle display screen to display the water level information in real time.

[0003] Based on this patent, firefighters can quickly know the amount of water and foam in the storage tank and replenish them as soon as possible when they find a shortage. However, since the rotation of the on-board fire pump is driven by the engine of the fire truck, when the liquid level in the storage tank is low, the on-board fire pump runs at high speed for a long time with less liquid supply or even runs idle, causing the pump body to heat up (lack of liquid to carry away heat), which affects the life of the pump body. Utility Model Content

[0004] The technical problem to be solved by the utility model is to provide a liquid level management device for a fire truck, which can increase the life of the on-board fire pump.

[0005] In order to solve the above technical problems, the utility model discloses a liquid level management device for a fire truck, the fire truck comprising a storage tank storing fire extinguishing liquid, a vehicle-mounted fire pump for conveying the fire extinguishing liquid from the storage tank along a pipeline, and an engine for providing kinetic energy to the vehicle-mounted fire pump; the liquid level management device comprises a liquid level meter and a controller;

[0006] The liquid level meter is arranged in the storage tank and is used to measure the liquid level height of the fire extinguishing liquid in the storage tank;

[0007] The signal output terminal of the liquid level meter is electrically connected to the first signal input terminal of the controller, and the first control signal output terminal of the controller is electrically connected to the idle state control terminal of the engine;

[0008] The liquid level meter triggers output of a first detection signal to the controller when detecting that the liquid level drops to a preset value. After receiving the first detection signal, the controller triggers output of a first control signal to the idle state control end of the engine. When the idle state control end of the engine receives the first control signal, it triggers the engine to enter the idle state.

[0009] As an optional implementation, it also includes a warning setting knob for setting the preset value; the warning setting knob includes a sliding resistor, and when the warning setting knob is rotated, the resistance value of the sliding resistor changes; the output end of the sliding resistor is electrically connected to the second signal input end of the controller.

[0010] As another optional embodiment, it also includes a liquid level indicator light; the first input end of the liquid level indicator light is electrically connected to the second control signal output end of the controller, and the second input end of the liquid level indicator light is grounded; the second control signal output end of the controller is used to control the liquid level indicator light to flash after receiving the first detection signal.

[0011] As yet another optional embodiment, the storage tank includes a water tank and a foam tank.

[0012] As another optional embodiment, it also includes a water filling valve which serves as the inlet of the water tank and can adjust the water replenishment amount of the water tank.

[0013] As another optional embodiment, the invention further comprises a foam filling valve which serves as an inlet of the foam tank and can adjust the amount of foam replenished in the foam tank.

[0014] As another optional implementation, the model of the controller is CR0401.

[0015] As another optional implementation, the liquid level indicator light is arranged in the cab and / or the pump room, and the pump room is used to place the vehicle-mounted fire pump.

[0016] As another optional embodiment, it also includes a liquid level gauge and a liquid level display screen for displaying the liquid level height of the fire extinguishing liquid in the storage tank.

[0017] Compared with the prior art, the embodiments of the present invention have the following beneficial effects:

[0018] Since the rotation of the vehicle-mounted fire pump is driven by the engine of the fire truck, in the embodiment of the utility model, when the liquid level in the storage tank is lower than the preset value, the engine speed can be reduced by controlling the engine to enter the idle state, thereby preventing the vehicle-mounted fire pump from running at high speed for a long time or even idling in a state of less liquid supply, causing the pump body to heat up, thereby increasing the life of the vehicle-mounted fire pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0020] Figure 1 It is a schematic diagram of the structure of the controller circuit disclosed in the embodiment of the utility model;

[0021] Figure 2 It is a structural schematic diagram of a liquid level meter and a liquid level meter circuit disclosed in an embodiment of the utility model;

[0022] Figure 3 It is a structural schematic diagram of a liquid level display screen circuit disclosed in an embodiment of the utility model. DETAILED DESCRIPTION

[0023] In order to enable those skilled in the art to better understand the solution of the utility model, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is only a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0024] See also Figure 1-3 The embodiment of the utility model discloses a liquid level management device of a fire truck, wherein the fire truck comprises a storage tank storing a fire extinguishing liquid (the storage tank comprises a water tank storing water and a foam tank storing foam, and the fire extinguishing liquid may be water, foam or a foam-water mixture), a vehicle-mounted fire pump for conveying the fire extinguishing liquid from the storage tank along a pipeline (for a foam-water mixture, water and foam may be mixed in advance through the same pipeline and then conveyed through the vehicle-mounted fire pump), and an engine for providing kinetic energy to the vehicle-mounted fire pump; the liquid level management device comprises a liquid level gauge (the liquid level gauge comprises Figure 2 Recycled water tank level sensor U8, foam tank level sensor U9), controller U21;

[0025] The liquid level meter is arranged in the storage tank (the water tank liquid level sensor U8 is arranged in the water tank, and the foam tank liquid level sensor U9 is arranged in the foam tank), and is used to measure the liquid level height of the fire extinguishing liquid in the storage tank;

[0026] The signal output terminal of the liquid level meter is electrically connected to the first signal input terminal of the controller U21 (the signal output terminal 1E4 of the water tank liquid level sensor is electrically connected to the P8a port of the controller U21, and the signal output terminal 1F4 of the foam tank liquid level sensor is electrically connected to the Y9a port of the controller U21), and the first control signal output terminal OUT00 of the controller U21 is electrically connected to the idle state control terminal N77C of the engine;

[0027] The liquid level meter triggers output of a first detection signal to the controller U21 when it detects that the liquid level drops to a preset value. After receiving the first detection signal, the controller U21 triggers output of a first control signal to the idle state control end of the engine. When the idle state control end of the engine receives the first control signal, it triggers the engine to enter the idle state.

[0028] Since the rotation of the vehicle-mounted fire pump is driven by the engine of the fire truck, in this embodiment, when the liquid level in the storage tank is lower than the preset value, the engine speed can be reduced by controlling the engine to enter the idle state, thereby preventing the vehicle-mounted fire pump from running at high speed for a long time or even idling in a state of less liquid supply, which will cause the pump body to heat up, thereby increasing the life of the vehicle-mounted fire pump.

[0029] In an optional embodiment, it also includes a warning setting knob for setting the preset value; the warning setting knob includes a water tank liquid level warning setting knob and a foam tank liquid level warning setting knob, wherein the water tank liquid level warning setting knob includes a sliding resistor R182.1, and the foam tank liquid level warning setting knob includes a sliding resistor R182.2; when the warning setting knob is rotated, the resistance value of the sliding resistor changes; the output end of the sliding resistor is electrically connected to the second signal input end of the controller U21 (the output end No. 2 of the sliding resistor R182.1 is electrically connected to the IN01 port of the controller U21, and the output end No. 2 of the sliding resistor R182.1 is electrically connected to the IN02 port of the controller U21); the input ends 1 and 3 of the sliding resistors R182.1 and R182.2 are connected to the power supply VCC.

[0030] When in use, by rotating the warning setting knob to drive the sliding resistor, the controller can receive and analyze the current change signal or the voltage change signal, and simply determine the liquid level warning value based on the current ratio or the voltage ratio (for example, the minimum current corresponds to the lowest liquid level warning value, the maximum current corresponds to the highest liquid level warning value, and the intermediate current value linearly corresponds to the intermediate liquid level warning value), and the preset value of the liquid level warning can be set in multiple gears.

[0031] In another optional embodiment, it also includes a liquid level indicator light (including a water tank liquid level indicator light H8.1 and a foam tank liquid level indicator light H8.2); the first input end of the liquid level indicator light is electrically connected to the second control signal output end of the controller U21 (the P8.1C port of the water tank liquid level indicator light H8.1 is electrically connected to the COUT06 port of the controller U21, and the Y8.2C port of the water tank liquid level indicator light H8.2 is electrically connected to the COUT05 port of the controller U21), and the second input end of the liquid level indicator light is grounded; the second control signal output end of the controller U21 is used to control the liquid level indicator light to flash after receiving the first detection signal.

[0032] In yet another optional embodiment, the liquid level indicator light is disposed in a cab and / or a pump room, and the pump room is used to place the vehicle-mounted fire pump.

[0033] In yet another optional embodiment, a water filling valve S88 is further included, which serves as the inlet of the water tank and can adjust the water replenishment amount of the water tank.

[0034] In yet another optional embodiment, a foam injection valve S89 is further included, which serves as an inlet of the foam tank and can adjust the amount of foam replenished in the foam tank.

[0035] In another optional embodiment, the model of the controller U21 is CR0401.

[0036] In another optional embodiment, a liquid level gauge and a liquid level display screen for displaying the liquid level height of the fire extinguishing liquid in the storage tank are further included. The liquid level gauge is arranged in the cab and the pump room, and the pump room is used to place the vehicle-mounted fire pump. Figure 2 Among them, P8.1 is the cab-water tank liquid level gauge, P8.3 is the pump room-water tank liquid level gauge, P9.1 is the cab-foam tank liquid level gauge, and P9.3 is the pump room-foam tank liquid level gauge. Figure 3 Among them, the cab-water tank liquid level display screen is U8.2, U8.3 is the pump room-water tank liquid level display screen, U9.2 is the cab-foam tank liquid level display screen, U9.3 is the pump room-foam tank liquid level display screen, 1E4 is the signal output end of the water tank liquid level sensor, and 1F4 is the signal output end of the foam tank liquid level sensor.

[0037] Optional, Figure 1 Among them, D55 is an automatic water injection valve and D56 is an automatic foam injection valve. When the fire management personnel inject liquid into the fire truck, they operate the switch to give a signal to the controller U21 to open the automatic water injection valve D55 and the automatic foam injection valve D56; when the controller U21 detects that the liquid level is 100%, it automatically closes the automatic water injection valve D55 and the automatic foam injection valve D56 to prevent the liquid from overflowing from the storage tank.

[0038] The contents disclosed in the embodiments of the present invention only disclose the preferred embodiments of the present invention, which are only used to illustrate the technical solutions of the present invention, rather than to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it should be understood by those skilled in the art that the technical solutions described in the aforementioned embodiments can still be modified, or some of the technical features therein can be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A liquid level management device for a fire truck, characterized in that: The fire truck includes a storage tank storing fire extinguishing liquid, an on-board fire pump for transporting the fire extinguishing liquid from the storage tank along a pipeline, and an engine for providing kinetic energy to the on-board fire pump; the liquid level management device includes a liquid level meter and a controller; The liquid level meter is arranged in the storage tank and is used to measure the liquid level height of the fire extinguishing liquid in the storage tank; The signal output terminal of the liquid level meter is electrically connected to the first signal input terminal of the controller, and the first control signal output terminal of the controller is electrically connected to the idle state control terminal of the engine; The liquid level meter triggers output of a first detection signal to the controller when detecting that the liquid level drops to a preset value. After receiving the first detection signal, the controller triggers output of a first control signal to the idle state control end of the engine. When the idle state control end of the engine receives the first control signal, it triggers the engine to enter the idle state.

2. The liquid level management device according to claim 1, characterized in that: It also includes an early warning setting knob for setting the preset value; the early warning setting knob includes a sliding resistor, and when the early warning setting knob is rotated, the resistance value of the sliding resistor changes; the output end of the sliding resistor is electrically connected to the second signal input end of the controller.

3. The liquid level management device according to claim 1, characterized in that: It also includes a liquid level indicator light; the first input end of the liquid level indicator light is electrically connected to the second control signal output end of the controller, and the second input end of the liquid level indicator light is grounded; the second control signal output end of the controller is used to control the liquid level indicator light to flash after receiving the first detection signal.

4. The liquid level management device according to claim 1, characterized in that: The storage tank includes a water tank and a foam tank.

5. The liquid level management device according to claim 4, characterized in that: The invention also comprises a water filling valve which is used as the inlet of the water tank and can adjust the water filling amount of the water tank.

6. The liquid level management device according to claim 4, characterized in that: The foam filling valve is used as the inlet of the foam tank and can adjust the amount of foam replenishment of the foam tank.

7. The liquid level management device according to claim 1, characterized in that: The model of the controller is CR0401.

8. The liquid level management device according to claim 3, characterized in that: The liquid level indicator light is arranged in the cab and / or the pump room, and the pump room is used to place the vehicle-mounted fire pump.

9. The liquid level management device according to claim 1, characterized in that: It also includes a liquid level gauge and a liquid level display screen for displaying the liquid level height of the fire extinguishing liquid in the storage tank.

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